/* roulang page: index */
:root {
            --bg-primary: #12161C;
            --bg-secondary: #1A2028;
            --bg-tertiary: #0E1216;
            --bg-elevated: #202A35;
            --accent-primary: #E88B2A;
            --accent-primary-hover: #F0A13C;
            --accent-primary-dim: rgba(232, 139, 42, 0.15);
            --accent-secondary: #B8E0E6;
            --accent-secondary-dim: rgba(184, 224, 230, 0.12);
            --text-primary: #ECE9E4;
            --text-secondary: #AAB2B8;
            --text-tertiary: #6E7A82;
            --border-color: rgba(240, 161, 60, 0.18);
            --border-color-strong: rgba(240, 161, 60, 0.35);
            --border-light: rgba(255, 255, 255, 0.08);
            --radius-sm: 10px;
            --radius-md: 14px;
            --radius-lg: 18px;
            --radius-xl: 24px;
            --shadow-low: 0 4px 16px rgba(0, 0, 0, 0.2);
            --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.25);
            --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.35);
            --shadow-accent: 0 8px 28px rgba(232, 139, 42, 0.18);
            --spacing-xs: 8px;
            --spacing-sm: 16px;
            --spacing-md: 24px;
            --spacing-lg: 40px;
            --spacing-xl: 64px;
            --spacing-xxl: 96px;
            --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Helvetica Neue', system-ui, sans-serif;
            --font-mono: 'JetBrains Mono', 'SF Mono', 'Courier New', Consolas, monospace;
            --transition-fast: 0.2s ease;
            --transition-base: 0.3s ease;
            --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
            --container-max: 1200px;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            font-size: 16px;
        }

        body {
            font-family: var(--font-body);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.7;
            font-size: 16px;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition-fast);
        }

        a:hover {
            color: var(--accent-primary-hover);
        }

        a:focus-visible {
            outline: 2px solid var(--accent-primary);
            outline-offset: 3px;
            border-radius: 4px;
        }

        button {
            font-family: var(--font-body);
            cursor: pointer;
            border: none;
            background: none;
            font-size: inherit;
            color: inherit;
            transition: all var(--transition-base);
        }

        button:focus-visible {
            outline: 2px solid var(--accent-primary);
            outline-offset: 3px;
        }

        input,
        select,
        textarea {
            font-family: var(--font-body);
            font-size: 16px;
            color: var(--text-primary);
            background-color: var(--bg-secondary);
            border: 1px solid rgba(255, 255, 255, 0.12);
            border-radius: var(--radius-sm);
            padding: 10px 14px;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
            width: 100%;
        }

        input::placeholder,
        textarea::placeholder {
            color: var(--text-tertiary);
        }

        input:focus,
        select:focus,
        textarea:focus {
            outline: none;
            border-color: var(--accent-primary);
            box-shadow: 0 0 0 3px rgba(232, 139, 42, 0.15);
        }

        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 var(--spacing-md);
            width: 100%;
        }

        .section {
            padding: var(--spacing-xl) 0;
            position: relative;
        }

        .section--alt {
            background-color: var(--bg-secondary);
        }

        .section--tertiary {
            background-color: var(--bg-tertiary);
        }

        .section--compact {
            padding: var(--spacing-lg) 0;
        }

        .section-header {
            margin-bottom: var(--spacing-lg);
            max-width: 760px;
        }

        .section-header--center {
            margin-left: auto;
            margin-right: auto;
            text-align: center;
        }

        .section-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 1.5px;
            text-transform: uppercase;
            color: var(--accent-primary);
            background-color: var(--accent-primary-dim);
            padding: 6px 16px;
            border-radius: 999px;
            margin-bottom: var(--spacing-sm);
            border: 1px solid rgba(232, 139, 42, 0.2);
        }

        .section-tag--secondary {
            color: var(--accent-secondary);
            background-color: var(--accent-secondary-dim);
            border-color: rgba(184, 224, 230, 0.2);
        }

        .section-title {
            font-size: 2rem;
            font-weight: 700;
            line-height: 1.3;
            color: var(--text-primary);
            letter-spacing: -0.5px;
            margin-bottom: var(--spacing-sm);
        }

        .section-desc {
            font-size: 1.05rem;
            color: var(--text-secondary);
            line-height: 1.8;
            max-width: 680px;
        }

        .section-header--center .section-desc {
            margin-left: auto;
            margin-right: auto;
        }

        .grid {
            display: grid;
            gap: var(--spacing-md);
        }

        .grid-2 {
            grid-template-columns: repeat(2, 1fr);
        }

        .grid-3 {
            grid-template-columns: repeat(3, 1fr);
        }

        .grid-4 {
            grid-template-columns: repeat(4, 1fr);
        }

        .grid-5 {
            grid-template-columns: repeat(5, 1fr);
        }

        .grid-6 {
            grid-template-columns: repeat(6, 1fr);
        }

        .card {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: var(--spacing-lg);
            box-shadow: var(--shadow-low);
            transition: all var(--transition-base);
            position: relative;
            overflow: hidden;
        }

        .card:hover {
            border-color: var(--border-color-strong);
            box-shadow: var(--shadow-accent);
            transform: translateY(-3px);
        }

        .card__icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-md);
            background-color: var(--accent-primary-dim);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--accent-primary);
            margin-bottom: var(--spacing-sm);
            flex-shrink: 0;
        }

        .card__icon--secondary {
            background-color: var(--accent-secondary-dim);
            color: var(--accent-secondary);
        }

        .card__title {
            font-size: 1.15rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: var(--spacing-xs);
            letter-spacing: -0.3px;
        }

        .card__text {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-weight: 600;
            font-size: 0.95rem;
            padding: 12px 24px;
            border-radius: var(--radius-md);
            transition: all var(--transition-base);
            white-space: nowrap;
            line-height: 1;
            letter-spacing: 0.3px;
        }

        .btn--primary {
            background-color: var(--accent-primary);
            color: #1A0E02;
            border: 1px solid var(--accent-primary);
        }

        .btn--primary:hover {
            background-color: var(--accent-primary-hover);
            border-color: var(--accent-primary-hover);
            box-shadow: 0 6px 20px rgba(232, 139, 42, 0.35);
            transform: translateY(-2px);
        }

        .btn--primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(232, 139, 42, 0.25);
        }

        .btn--ghost {
            background-color: transparent;
            color: var(--text-primary);
            border: 1px solid var(--border-color);
        }

        .btn--ghost:hover {
            border-color: var(--accent-primary);
            color: var(--accent-primary);
            box-shadow: var(--shadow-accent);
            transform: translateY(-2px);
        }

        .btn--ghost:active {
            transform: translateY(0);
        }

        .btn--secondary {
            background-color: var(--accent-secondary);
            color: #0A1A1D;
            border: 1px solid var(--accent-secondary);
        }

        .btn--secondary:hover {
            background-color: #CFF0F5;
            border-color: #CFF0F5;
            box-shadow: 0 6px 20px rgba(184, 224, 230, 0.25);
            transform: translateY(-2px);
        }

        .btn--lg {
            padding: 16px 32px;
            font-size: 1.05rem;
            border-radius: var(--radius-lg);
        }

        .btn--sm {
            padding: 8px 16px;
            font-size: 0.85rem;
            border-radius: var(--radius-sm);
        }

        .badge {
            display: inline-block;
            font-size: 12px;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 999px;
            background-color: var(--accent-primary-dim);
            color: var(--accent-primary);
            letter-spacing: 0.5px;
            white-space: nowrap;
        }

        .badge--secondary {
            background-color: var(--accent-secondary-dim);
            color: var(--accent-secondary);
        }

        .badge--neutral {
            background-color: rgba(170, 178, 184, 0.12);
            color: var(--text-secondary);
        }

        /* Header */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background-color: rgba(18, 22, 28, 0.9);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-light);
        }

        .header-top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--spacing-md);
            padding: var(--spacing-sm) 0;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.5px;
            flex-shrink: 0;
        }

        .logo__icon {
            width: 36px;
            height: 36px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--accent-primary), #C56A1A);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1rem;
            color: #1A0E02;
            font-weight: 800;
        }

        .logo:hover {
            color: var(--accent-primary-hover);
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
        }

        .search-box {
            display: flex;
            align-items: center;
            gap: 8px;
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: 8px 14px;
            min-width: 220px;
            transition: border-color var(--transition-fast);
        }

        .search-box:focus-within {
            border-color: var(--accent-primary);
            box-shadow: 0 0 0 3px rgba(232, 139, 42, 0.1);
        }

        .search-box input {
            background: none;
            border: none;
            padding: 0;
            font-size: 14px;
            color: var(--text-primary);
            width: 100%;
        }

        .search-box input:focus {
            box-shadow: none;
        }

        .search-box__icon {
            color: var(--text-tertiary);
            font-size: 14px;
            flex-shrink: 0;
        }

        .header-nav {
            display: flex;
            align-items: center;
            gap: var(--spacing-xs);
            padding: var(--spacing-xs) 0 var(--spacing-sm);
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: none;
            -ms-overflow-style: none;
        }

        .header-nav::-webkit-scrollbar {
            display: none;
        }

        .nav-tab {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
            padding: 8px 16px;
            border-radius: 999px;
            white-space: nowrap;
            transition: all var(--transition-fast);
            border: 1px solid transparent;
            position: relative;
        }

        .nav-tab:hover {
            color: var(--text-primary);
            background-color: rgba(255, 255, 255, 0.04);
        }

        .nav-tab--active {
            color: var(--accent-primary);
            background-color: var(--accent-primary-dim);
            border-color: rgba(232, 139, 42, 0.25);
            font-weight: 600;
        }

        .nav-tab--active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background-color: var(--accent-primary);
            border-radius: 3px;
        }

        /* Hero */
        .hero {
            position: relative;
            padding: var(--spacing-xl) 0 var(--spacing-xxl);
            overflow: hidden;
            background-color: var(--bg-tertiary);
        }

        .hero__bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/90fe29bbba55f237.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.3;
            z-index: 0;
        }

        .hero__overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(14, 18, 22, 0.6) 0%, rgba(14, 18, 22, 0.85) 60%, var(--bg-tertiary) 100%);
            z-index: 1;
        }

        .hero__content {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1fr 1.1fr;
            gap: var(--spacing-xl);
            align-items: center;
            min-height: 520px;
        }

        .hero__text {
            display: flex;
            flex-direction: column;
            align-items: flex-start;
            gap: var(--spacing-sm);
        }

        .hero__badge-group {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-bottom: var(--spacing-xs);
        }

        .hero h1 {
            font-size: 3.2rem;
            font-weight: 800;
            line-height: 1.15;
            letter-spacing: -1px;
            color: var(--text-primary);
            margin: 0;
        }

        .hero h1 .accent {
            color: var(--accent-primary);
        }

        .hero__sub {
            font-size: 1.12rem;
            color: var(--text-secondary);
            line-height: 1.8;
            max-width: 540px;
        }

        .hero__cta {
            display: flex;
            flex-wrap: wrap;
            gap: var(--spacing-sm);
            margin-top: var(--spacing-sm);
        }

        .hero__data-row {
            display: flex;
            gap: var(--spacing-lg);
            margin-top: var(--spacing-md);
            flex-wrap: wrap;
        }

        .hero__data-item {
            display: flex;
            flex-direction: column;
            gap: 2px;
        }

        .hero__data-num {
            font-family: var(--font-mono);
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--accent-primary);
            letter-spacing: -0.5px;
        }

        .hero__data-label {
            font-size: 13px;
            color: var(--text-tertiary);
        }

        .hero__visual {
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 400px;
        }

        .hero__panel {
            background-color: rgba(26, 32, 40, 0.85);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-xl);
            padding: var(--spacing-lg);
            box-shadow: var(--shadow-lg);
            width: 100%;
            max-width: 480px;
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
        }

        .hero__panel-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: var(--spacing-md);
            padding-bottom: var(--spacing-sm);
            border-bottom: 1px solid var(--border-light);
        }

        .hero__panel-title {
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--text-secondary);
        }

        .hero__panel-dots {
            display: flex;
            gap: 6px;
        }

        .hero__panel-dots span {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background-color: var(--text-tertiary);
        }

        .hero__panel-dots span:first-child {
            background-color: var(--accent-primary);
        }

        .hero__panel-body {
            display: flex;
            flex-direction: column;
            gap: var(--spacing-sm);
        }

        .hero__metric {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 12px 14px;
            background-color: rgba(255, 255, 255, 0.03);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-light);
        }

        .hero__metric-label {
            font-size: 13px;
            color: var(--text-secondary);
        }

        .hero__metric-value {
            font-family: var(--font-mono);
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--accent-secondary);
        }

        .hero__metric-value--accent {
            color: var(--accent-primary);
        }

        .hero__progress {
            margin-top: var(--spacing-xs);
        }

        .hero__progress-bar {
            height: 6px;
            background-color: rgba(255, 255, 255, 0.06);
            border-radius: 3px;
            overflow: hidden;
            margin-top: 6px;
        }

        .hero__progress-fill {
            height: 100%;
            background: linear-gradient(90deg, var(--accent-primary), var(--accent-primary-hover));
            border-radius: 3px;
            transition: width var(--transition-slow);
        }

        /* Pain points */
        .pain-card {
            border-left: 3px solid var(--accent-primary);
            border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
        }

        .pain-card:hover {
            border-left-color: var(--accent-primary-hover);
            border-top-color: var(--border-color-strong);
            border-right-color: var(--border-color-strong);
            border-bottom-color: var(--border-color-strong);
        }

        /* Solution overview */
        .solution-flow {
            display: flex;
            flex-direction: column;
            gap: var(--spacing-sm);
        }

        .solution-item {
            display: flex;
            align-items: flex-start;
            gap: var(--spacing-md);
            padding: var(--spacing-md);
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            transition: all var(--transition-base);
        }

        .solution-item:hover {
            border-color: var(--border-color);
            background-color: var(--bg-elevated);
        }

        .solution-item__num {
            font-family: var(--font-mono);
            font-weight: 700;
            font-size: 1.2rem;
            color: var(--accent-primary);
            min-width: 36px;
            text-align: center;
        }

        .solution-item__body {
            flex: 1;
        }

        .solution-item__title {
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 4px;
        }

        .solution-item__text {
            font-size: 0.9rem;
            color: var(--text-secondary);
        }

        /* Steps */
        .steps {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: var(--spacing-sm);
            counter-reset: step;
        }

        .step-card {
            text-align: center;
            padding: var(--spacing-md);
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            position: relative;
            transition: all var(--transition-base);
        }

        .step-card:hover {
            border-color: var(--border-color);
            transform: translateY(-3px);
            box-shadow: var(--shadow-md);
        }

        .step-card::before {
            counter-increment: step;
            content: counter(step, decimal-leading-zero);
            font-family: var(--font-mono);
            font-size: 2.2rem;
            font-weight: 800;
            color: rgba(232, 139, 42, 0.35);
            display: block;
            margin-bottom: var(--spacing-xs);
            line-height: 1;
        }

        .step-card__title {
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 6px;
        }

        .step-card__text {
            font-size: 0.82rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* Data cards */
        .data-card {
            text-align: center;
            padding: var(--spacing-md);
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            transition: all var(--transition-base);
        }

        .data-card:hover {
            border-color: var(--border-color-strong);
            box-shadow: var(--shadow-accent);
        }

        .data-card__num {
            font-family: var(--font-mono);
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--accent-primary);
            letter-spacing: -1px;
            line-height: 1.2;
        }

        .data-card__num--secondary {
            color: var(--accent-secondary);
        }

        .data-card__label {
            font-size: 0.85rem;
            color: var(--text-secondary);
            margin-top: 6px;
        }

        /* Testimonials */
        .testimonial-card {
            padding: var(--spacing-lg);
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            transition: all var(--transition-base);
        }

        .testimonial-card:hover {
            border-color: var(--border-color);
            box-shadow: var(--shadow-md);
        }

        .testimonial-card__quote {
            font-size: 0.95rem;
            color: var(--text-primary);
            line-height: 1.8;
            margin-bottom: var(--spacing-sm);
            font-style: italic;
        }

        .testimonial-card__author {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .testimonial-card__avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--accent-primary-dim), var(--accent-secondary-dim));
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            color: var(--accent-primary);
            font-size: 0.9rem;
            flex-shrink: 0;
        }

        .testimonial-card__name {
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--text-primary);
        }

        .testimonial-card__role {
            font-size: 0.78rem;
            color: var(--text-tertiary);
        }

        /* Audience */
        .audience-card {
            display: flex;
            flex-direction: column;
            gap: var(--spacing-xs);
            padding: var(--spacing-md);
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            transition: all var(--transition-base);
        }

        .audience-card:hover {
            border-color: var(--border-color);
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

        .audience-card__tag {
            font-size: 11px;
            font-weight: 600;
            color: var(--accent-secondary);
            letter-spacing: 0.8px;
            text-transform: uppercase;
        }

        .audience-card__title {
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--text-primary);
        }

        .audience-card__text {
            font-size: 0.85rem;
            color: var(--text-secondary);
            line-height: 1.65;
        }

        /* Function detail */
        .function-card {
            display: flex;
            gap: var(--spacing-sm);
            padding: var(--spacing-md);
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            transition: all var(--transition-base);
            align-items: flex-start;
        }

        .function-card:hover {
            border-color: var(--border-color-strong);
            box-shadow: var(--shadow-accent);
            transform: translateY(-2px);
        }

        .function-card__num {
            font-family: var(--font-mono);
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--accent-primary);
            min-width: 28px;
            flex-shrink: 0;
        }

        .function-card__content {
            flex: 1;
        }

        .function-card__title {
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 4px;
        }

        .function-card__text {
            font-size: 0.85rem;
            color: var(--text-secondary);
            line-height: 1.65;
        }

        /* Topology */
        .topology-visual {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: var(--spacing-md);
            padding: var(--spacing-lg);
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-xl);
            flex-wrap: wrap;
        }

        .topology-node {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 8px;
            padding: var(--spacing-md);
            background-color: var(--bg-tertiary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            min-width: 120px;
            transition: all var(--transition-base);
        }

        .topology-node:hover {
            border-color: var(--accent-primary);
            box-shadow: var(--shadow-accent);
        }

        .topology-node__icon {
            font-size: 1.8rem;
            color: var(--accent-primary);
        }

        .topology-node__name {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text-primary);
            text-align: center;
        }

        .topology-node__desc {
            font-size: 0.75rem;
            color: var(--text-tertiary);
            text-align: center;
        }

        .topology-line {
            width: 40px;
            height: 2px;
            background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
            border-radius: 2px;
            flex-shrink: 0;
            position: relative;
        }

        /* Tuning cards */
        .tuning-card {
            padding: var(--spacing-md);
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            transition: all var(--transition-base);
        }

        .tuning-card:hover {
            border-color: var(--accent-secondary);
            box-shadow: var(--shadow-md);
        }

        .tuning-card__title {
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 6px;
            font-size: 0.95rem;
        }

        .tuning-card__text {
            font-size: 0.82rem;
            color: var(--text-secondary);
            line-height: 1.65;
        }

        /* News */
        .news-card {
            display: flex;
            gap: var(--spacing-md);
            padding: var(--spacing-sm);
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            transition: all var(--transition-base);
            align-items: center;
        }

        .news-card:hover {
            border-color: var(--border-color);
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

        .news-card__img {
            width: 100px;
            height: 80px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            flex-shrink: 0;
        }

        .news-card__body {
            flex: 1;
            min-width: 0;
        }

        .news-card__title {
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--text-primary);
            margin-bottom: 4px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .news-card__meta {
            font-size: 0.78rem;
            color: var(--text-tertiary);
        }

        .news-card__text {
            font-size: 0.82rem;
            color: var(--text-secondary);
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        /* Metrics dashboard */
        .metrics-dashboard {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-xl);
            padding: var(--spacing-lg);
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--spacing-md);
        }

        .metrics-dashboard__item {
            display: flex;
            flex-direction: column;
            gap: 4px;
            padding: var(--spacing-md);
            background-color: var(--bg-tertiary);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            transition: all var(--transition-base);
        }

        .metrics-dashboard__item:hover {
            border-color: var(--border-color);
        }

        .metrics-dashboard__num {
            font-family: var(--font-mono);
            font-size: 2rem;
            font-weight: 800;
            color: var(--accent-primary);
            letter-spacing: -0.5px;
            line-height: 1.1;
        }

        .metrics-dashboard__num--secondary {
            color: var(--accent-secondary);
        }

        .metrics-dashboard__label {
            font-size: 0.82rem;
            color: var(--text-secondary);
        }

        /* Brand story */
        .brand-story {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-xl);
            padding: var(--spacing-xl);
            position: relative;
            overflow: hidden;
        }

        .brand-story::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(232, 139, 42, 0.08), transparent 60%);
            border-radius: 50%;
            pointer-events: none;
        }

        .brand-story__title {
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: var(--spacing-sm);
            letter-spacing: -0.5px;
        }

        .brand-story__text {
            color: var(--text-secondary);
            line-height: 2;
            font-size: 0.98rem;
            max-width: 900px;
        }

        /* Deployment */
        .deploy-table {
            width: 100%;
            border-collapse: collapse;
            background-color: var(--bg-secondary);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border-light);
        }

        .deploy-table th {
            text-align: left;
            padding: 14px 16px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text-primary);
            background-color: var(--bg-elevated);
            border-bottom: 1px solid var(--border-light);
        }

        .deploy-table td {
            padding: 14px 16px;
            font-size: 0.88rem;
            color: var(--text-secondary);
            border-bottom: 1px solid var(--border-light);
        }

        .deploy-table tr:last-child td {
            border-bottom: none;
        }

        .deploy-table tr:hover td {
            background-color: rgba(255, 255, 255, 0.02);
        }

        /* FAQ */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: var(--spacing-sm);
        }

        .faq-item {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition-base);
        }

        .faq-item:hover {
            border-color: var(--border-color);
        }

        .faq-item__question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--spacing-sm);
            padding: var(--spacing-md);
            font-weight: 600;
            color: var(--text-primary);
            font-size: 0.95rem;
            cursor: pointer;
            user-select: none;
        }

        .faq-item__question:hover {
            color: var(--accent-primary);
        }

        .faq-item__icon {
            color: var(--accent-primary);
            font-size: 1.2rem;
            flex-shrink: 0;
            transition: transform var(--transition-fast);
        }

        .faq-item__answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow);
        }

        .faq-item--open .faq-item__answer {
            max-height: 300px;
        }

        .faq-item--open .faq-item__icon {
            transform: rotate(45deg);
        }

        .faq-item__answer-text {
            padding: 0 var(--spacing-md) var(--spacing-md);
            color: var(--text-secondary);
            font-size: 0.88rem;
            line-height: 1.7;
        }

        /* CTA */
        .cta-section {
            background-color: var(--bg-tertiary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-xl);
            padding: var(--spacing-xl);
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -80%;
            left: 50%;
            transform: translateX(-50%);
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(232, 139, 42, 0.1), transparent 60%);
            border-radius: 50%;
            pointer-events: none;
        }

        .cta-section__title {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: var(--spacing-sm);
            letter-spacing: -0.5px;
            position: relative;
        }

        .cta-section__text {
            color: var(--text-secondary);
            font-size: 1.05rem;
            margin-bottom: var(--spacing-lg);
            position: relative;
        }

        .cta-section__buttons {
            display: flex;
            flex-wrap: wrap;
            gap: var(--spacing-sm);
            justify-content: center;
            position: relative;
        }

        /* Changelog */
        .changelog-list {
            display: flex;
            flex-direction: column;
            gap: var(--spacing-sm);
        }

        .changelog-item {
            display: flex;
            align-items: flex-start;
            gap: var(--spacing-md);
            padding: var(--spacing-sm) 0;
            border-bottom: 1px solid var(--border-light);
        }

        .changelog-item:last-child {
            border-bottom: none;
        }

        .changelog-item__date {
            font-family: var(--font-mono);
            font-size: 0.82rem;
            color: var(--accent-primary);
            min-width: 70px;
            flex-shrink: 0;
            font-weight: 600;
        }

        .changelog-item__text {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        .changelog-item__text strong {
            color: var(--text-primary);
            font-weight: 600;
        }

        /* Resource download */
        .resource-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--spacing-sm);
        }

        .resource-card {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
            padding: var(--spacing-md);
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            transition: all var(--transition-base);
        }

        .resource-card:hover {
            border-color: var(--accent-primary);
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

        .resource-card__icon {
            font-size: 1.5rem;
            flex-shrink: 0;
        }

        .resource-card__info {
            flex: 1;
        }

        .resource-card__title {
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--text-primary);
        }

        .resource-card__desc {
            font-size: 0.78rem;
            color: var(--text-tertiary);
        }

        /* Footer */
        .site-footer {
            background-color: var(--bg-tertiary);
            border-top: 1px solid var(--border-light);
            padding: var(--spacing-xl) 0 var(--spacing-md);
        }

        .footer-main {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: var(--spacing-lg);
            margin-bottom: var(--spacing-lg);
        }

        .footer-brand {
            display: flex;
            flex-direction: column;
            gap: var(--spacing-sm);
        }

        .footer-brand .logo {
            font-size: 1.2rem;
        }

        .footer-brand__text {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.7;
            max-width: 320px;
        }

        .footer-col__title {
            font-size: 0.9rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: var(--spacing-sm);
            letter-spacing: 0.5px;
        }

        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .footer-links a {
            font-size: 0.85rem;
            color: var(--text-secondary);
            transition: color var(--transition-fast);
        }

        .footer-links a:hover {
            color: var(--accent-primary);
        }

        .footer-bottom {
            border-top: 1px solid var(--border-light);
            padding-top: var(--spacing-md);
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: var(--spacing-sm);
            font-size: 0.78rem;
            color: var(--text-tertiary);
        }

        .footer-bottom a {
            color: var(--text-tertiary);
        }

        .footer-bottom a:hover {
            color: var(--accent-primary);
        }

        .footer-legal {
            display: flex;
            flex-wrap: wrap;
            gap: var(--spacing-sm);
            align-items: center;
        }

        /* Mobile nav toggle */
        .mobile-nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            background: none;
            border: none;
            cursor: pointer;
        }

        .mobile-nav-toggle span {
            width: 22px;
            height: 2px;
            background-color: var(--text-primary);
            border-radius: 2px;
            transition: all var(--transition-fast);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            :root {
                --spacing-xl: 48px;
                --spacing-xxl: 72px;
            }

            .hero__content {
                grid-template-columns: 1fr;
                gap: var(--spacing-lg);
                min-height: auto;
            }

            .hero__visual {
                min-height: auto;
            }

            .hero h1 {
                font-size: 2.5rem;
            }

            .grid-4,
            .grid-5,
            .grid-6 {
                grid-template-columns: repeat(2, 1fr);
            }

            .metrics-dashboard {
                grid-template-columns: repeat(2, 1fr);
            }

            .footer-main {
                grid-template-columns: 1fr 1fr;
            }

            .steps {
                grid-template-columns: repeat(3, 1fr);
            }
        }

        @media (max-width: 768px) {
            :root {
                --spacing-xl: 40px;
                --spacing-xxl: 56px;
                --spacing-lg: 28px;
            }

            .section-title {
                font-size: 1.5rem;
            }

            .hero h1 {
                font-size: 2rem;
            }

            .hero__sub {
                font-size: 1rem;
            }

            .grid-2,
            .grid-3,
            .grid-4,
            .grid-5,
            .grid-6 {
                grid-template-columns: 1fr;
            }

            .metrics-dashboard {
                grid-template-columns: 1fr;
            }

            .resource-grid {
                grid-template-columns: 1fr;
            }

            .steps {
                grid-template-columns: 1fr;
            }

            .header-top {
                flex-wrap: wrap;
            }

            .search-box {
                min-width: 140px;
                flex: 1;
            }

            .header-actions .btn--sm {
                padding: 6px 12px;
                font-size: 0.75rem;
            }

            .header-nav {
                gap: 4px;
            }

            .nav-tab {
                padding: 6px 12px;
                font-size: 13px;
            }

            .footer-main {
                grid-template-columns: 1fr;
                gap: var(--spacing-md);
            }

            .footer-bottom {
                flex-direction: column;
                text-align: center;
                gap: 8px;
            }

            .news-card {
                flex-direction: column;
                align-items: flex-start;
            }

            .news-card__img {
                width: 100%;
                height: 160px;
            }

            .topology-visual {
                flex-direction: column;
                gap: var(--spacing-sm);
            }

            .topology-line {
                width: 2px;
                height: 30px;
                background: linear-gradient(180deg, var(--accent-primary), var(--accent-secondary));
            }

            .cta-section__title {
                font-size: 1.6rem;
            }

            .hero__data-row {
                gap: var(--spacing-md);
            }
        }

        @media (max-width: 520px) {
            .hero h1 {
                font-size: 1.7rem;
            }

            .hero__cta {
                flex-direction: column;
                width: 100%;
            }

            .hero__cta .btn {
                width: 100%;
            }

            .header-actions {
                gap: 6px;
            }

            .search-box {
                min-width: 100px;
                padding: 6px 10px;
            }

            .logo {
                font-size: 1.1rem;
            }

            .logo__icon {
                width: 28px;
                height: 28px;
                font-size: 0.8rem;
            }

            .section {
                padding: var(--spacing-lg) 0;
            }

            .card {
                padding: var(--spacing-md);
            }

            .data-card__num {
                font-size: 1.8rem;
            }
        }

        /* Utility */
        .text-center {
            text-align: center;
        }

        .mt-sm {
            margin-top: var(--spacing-sm);
        }

        .mt-md {
            margin-top: var(--spacing-md);
        }

        .mt-lg {
            margin-top: var(--spacing-lg);
        }

        .mb-0 {
            margin-bottom: 0;
        }

        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border-width: 0;
        }

/* roulang page: category1 */
:root {
            --bg-primary: #12161C;
            --bg-secondary: #1A2028;
            --bg-tertiary: #0E1216;
            --bg-elevated: #202A35;
            --accent-primary: #E88B2A;
            --accent-primary-hover: #F0A13C;
            --accent-primary-dim: rgba(232, 139, 42, 0.15);
            --accent-secondary: #B8E0E6;
            --accent-secondary-dim: rgba(184, 224, 230, 0.12);
            --text-primary: #ECE9E4;
            --text-secondary: #AAB2B8;
            --text-tertiary: #6E7A82;
            --border-color: rgba(240, 161, 60, 0.18);
            --border-color-strong: rgba(240, 161, 60, 0.35);
            --border-light: rgba(255, 255, 255, 0.08);
            --radius-sm: 10px;
            --radius-md: 14px;
            --radius-lg: 18px;
            --radius-xl: 24px;
            --shadow-low: 0 4px 16px rgba(0, 0, 0, 0.2);
            --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.25);
            --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.35);
            --shadow-accent: 0 8px 28px rgba(232, 139, 42, 0.18);
            --spacing-xs: 8px;
            --spacing-sm: 16px;
            --spacing-md: 24px;
            --spacing-lg: 40px;
            --spacing-xl: 64px;
            --spacing-xxl: 96px;
            --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Helvetica Neue', system-ui, sans-serif;
            --font-mono: 'JetBrains Mono', 'SF Mono', 'Courier New', Consolas, monospace;
            --transition-fast: 0.2s ease;
            --transition-base: 0.3s ease;
            --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
            --container-max: 1200px;
        }

        @media (max-width: 1024px) {
            :root {
                --spacing-xl: 48px;
                --spacing-xxl: 72px;
            }
        }

        @media (max-width: 768px) {
            :root {
                --spacing-xl: 40px;
                --spacing-xxl: 56px;
                --spacing-lg: 28px;
            }
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            font-size: 16px;
        }

        body {
            font-family: var(--font-body);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.7;
            font-size: 16px;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition-fast);
        }

        a:hover {
            color: var(--accent-primary-hover);
        }

        a:focus-visible {
            outline: 2px solid var(--accent-primary);
            outline-offset: 3px;
            border-radius: 4px;
        }

        button {
            font-family: var(--font-body);
            cursor: pointer;
            border: none;
            background: none;
            font-size: inherit;
            color: inherit;
            transition: all var(--transition-base);
        }

        button:focus-visible {
            outline: 2px solid var(--accent-primary);
            outline-offset: 3px;
        }

        input,
        select,
        textarea {
            font-family: var(--font-body);
            font-size: 16px;
            color: var(--text-primary);
            background-color: var(--bg-secondary);
            border: 1px solid rgba(255, 255, 255, 0.12);
            border-radius: var(--radius-sm);
            padding: 10px 14px;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
            width: 100%;
        }

        input::placeholder,
        textarea::placeholder {
            color: var(--text-tertiary);
        }

        input:focus,
        select:focus,
        textarea:focus {
            outline: none;
            border-color: var(--accent-primary);
            box-shadow: 0 0 0 3px rgba(232, 139, 42, 0.15);
        }

        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 var(--spacing-md);
            width: 100%;
        }

        .section {
            padding: var(--spacing-xl) 0;
            position: relative;
        }

        .section--alt {
            background-color: var(--bg-secondary);
        }

        .section--tertiary {
            background-color: var(--bg-tertiary);
        }

        .section--compact {
            padding: var(--spacing-lg) 0;
        }

        .section-header {
            margin-bottom: var(--spacing-lg);
            max-width: 760px;
        }

        .section-header--center {
            margin-left: auto;
            margin-right: auto;
            text-align: center;
        }

        .section-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 1.5px;
            text-transform: uppercase;
            color: var(--accent-primary);
            background-color: var(--accent-primary-dim);
            padding: 6px 16px;
            border-radius: 999px;
            margin-bottom: var(--spacing-sm);
            border: 1px solid rgba(232, 139, 42, 0.2);
        }

        .section-tag--secondary {
            color: var(--accent-secondary);
            background-color: var(--accent-secondary-dim);
            border-color: rgba(184, 224, 230, 0.2);
        }

        .section-title {
            font-size: 32px;
            font-weight: 700;
            line-height: 1.3;
            margin-bottom: var(--spacing-sm);
            color: var(--text-primary);
        }

        .section-subtitle {
            font-size: 16px;
            line-height: 1.8;
            color: var(--text-secondary);
            margin-bottom: var(--spacing-sm);
        }

        .section-title--lg {
            font-size: 38px;
        }

        @media (max-width: 768px) {
            .section-title {
                font-size: 26px;
            }
            .section-title--lg {
                font-size: 28px;
            }
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-weight: 600;
            font-size: 15px;
            padding: 12px 24px;
            border-radius: var(--radius-sm);
            transition: all var(--transition-base);
            border: 1px solid transparent;
            line-height: 1.4;
            white-space: nowrap;
        }

        .btn:hover {
            transform: translateY(-2px);
        }

        .btn:active {
            transform: translateY(0);
            box-shadow: none;
        }

        .btn--primary {
            background-color: var(--accent-primary);
            color: #12161C;
            border-color: var(--accent-primary);
            box-shadow: var(--shadow-accent);
        }

        .btn--primary:hover {
            background-color: var(--accent-primary-hover);
            border-color: var(--accent-primary-hover);
            box-shadow: 0 12px 36px rgba(232, 139, 42, 0.28);
            color: #12161C;
        }

        .btn--outline {
            background-color: transparent;
            color: var(--accent-primary);
            border-color: var(--border-color-strong);
        }

        .btn--outline:hover {
            background-color: var(--accent-primary-dim);
            border-color: var(--accent-primary);
            color: var(--accent-primary-hover);
        }

        .btn--sm {
            padding: 8px 16px;
            font-size: 14px;
        }

        .btn--lg {
            padding: 16px 32px;
            font-size: 16px;
        }

        /* Header */
        .site-header {
            background-color: var(--bg-tertiary);
            border-bottom: 1px solid var(--border-light);
            position: sticky;
            top: 0;
            z-index: 100;
            backdrop-filter: blur(12px);
        }

        .header-top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--spacing-md);
            padding: var(--spacing-sm) 0;
        }

        .logo {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 20px;
            color: var(--text-primary);
            letter-spacing: 0.5px;
            white-space: nowrap;
        }

        .logo:hover {
            color: var(--accent-primary-hover);
        }

        .logo__icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, rgba(232, 139, 42, 0.25), rgba(184, 224, 230, 0.12));
            border: 1px solid var(--border-color-strong);
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-weight: 800;
            color: var(--accent-primary);
            letter-spacing: 0;
            font-family: var(--font-mono);
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
        }

        .search-box {
            display: flex;
            align-items: center;
            gap: 8px;
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-sm);
            padding: 6px 12px;
            width: 240px;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
        }

        .search-box:focus-within {
            border-color: var(--accent-primary);
            box-shadow: 0 0 0 3px rgba(232, 139, 42, 0.12);
        }

        .search-box__icon {
            font-size: 14px;
            color: var(--text-tertiary);
            flex-shrink: 0;
        }

        .search-box input {
            background: none;
            border: none;
            padding: 4px 0;
            font-size: 13px;
            color: var(--text-primary);
        }

        .search-box input:focus {
            box-shadow: none;
            outline: none;
        }

        .header-nav {
            display: flex;
            align-items: center;
            gap: 4px;
            overflow-x: auto;
            padding-bottom: var(--spacing-xs);
            scrollbar-width: thin;
            scrollbar-color: var(--border-color-strong) transparent;
        }

        .header-nav::-webkit-scrollbar {
            height: 4px;
        }

        .header-nav::-webkit-scrollbar-thumb {
            background-color: var(--border-color-strong);
            border-radius: 999px;
        }

        .nav-tab {
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: 999px;
            border: 1px solid transparent;
            white-space: nowrap;
            transition: all var(--transition-fast);
            position: relative;
        }

        .nav-tab:hover {
            color: var(--text-primary);
            background-color: var(--bg-secondary);
            border-color: var(--border-light);
        }

        .nav-tab--active {
            color: var(--accent-primary);
            background-color: var(--accent-primary-dim);
            border-color: var(--border-color-strong);
            font-weight: 600;
        }

        .nav-tab--active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 2px;
            background-color: var(--accent-primary);
            border-radius: 999px;
        }

        @media (max-width: 768px) {
            .header-top {
                flex-wrap: wrap;
                gap: var(--spacing-sm);
            }
            .header-actions {
                width: 100%;
                justify-content: space-between;
            }
            .search-box {
                width: 100%;
                max-width: 260px;
            }
            .logo {
                font-size: 17px;
            }
            .logo__icon {
                width: 34px;
                height: 34px;
                font-size: 12px;
            }
            .nav-tab {
                padding: 6px 12px;
                font-size: 13px;
            }
            .btn--sm {
                padding: 7px 12px;
                font-size: 12px;
            }
        }

        @media (max-width: 520px) {
            .header-actions {
                flex-direction: column;
                align-items: stretch;
            }
            .search-box {
                max-width: 100%;
            }
            .header-actions .btn {
                width: 100%;
                justify-content: center;
            }
            .header-nav {
                gap: 2px;
            }
            .nav-tab {
                padding: 6px 10px;
                font-size: 12px;
            }
        }

        /* Breadcrumb */
        .breadcrumb {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 13px;
            color: var(--text-tertiary);
            padding: var(--spacing-sm) 0;
            margin-bottom: var(--spacing-xs);
        }

        .breadcrumb a {
            color: var(--text-secondary);
            transition: color var(--transition-fast);
        }

        .breadcrumb a:hover {
            color: var(--accent-primary);
        }

        .breadcrumb__sep {
            color: var(--text-tertiary);
            user-select: none;
        }

        .breadcrumb__current {
            color: var(--text-primary);
            font-weight: 500;
        }

        /* Category header */
        .category-head {
            padding: var(--spacing-lg) 0 var(--spacing-md);
            margin-bottom: var(--spacing-sm);
            border-bottom: 1px solid var(--border-light);
        }

        .category-head__wrap {
            display: flex;
            align-items: flex-start;
            justify-content: space-between;
            gap: var(--spacing-lg);
            flex-wrap: wrap;
        }

        .category-head__content {
            flex: 1;
            min-width: 0;
            max-width: 780px;
        }

        .category-head__title {
            font-size: 36px;
            font-weight: 700;
            line-height: 1.25;
            color: var(--text-primary);
            margin-bottom: var(--spacing-sm);
        }

        .category-head__desc {
            font-size: 16px;
            line-height: 1.8;
            color: var(--text-secondary);
            max-width: 720px;
        }

        .category-head__meta {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
            margin-top: var(--spacing-sm);
            flex-wrap: wrap;
        }

        .category-head__badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 12px;
            font-weight: 500;
            color: var(--accent-secondary);
            background-color: var(--accent-secondary-dim);
            padding: 4px 12px;
            border-radius: 999px;
            border: 1px solid rgba(184, 224, 230, 0.18);
        }

        @media (max-width: 768px) {
            .category-head__title {
                font-size: 26px;
            }
            .category-head__desc {
                font-size: 15px;
            }
            .category-head__wrap {
                flex-direction: column;
                gap: var(--spacing-md);
            }
        }

        /* Card grid */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--spacing-md);
        }

        .card-grid--2 {
            grid-template-columns: repeat(2, 1fr);
        }

        .card-grid--4 {
            grid-template-columns: repeat(4, 1fr);
        }

        @media (max-width: 1024px) {
            .card-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .card-grid--4 {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .card-grid,
            .card-grid--2,
            .card-grid--4 {
                grid-template-columns: 1fr;
                gap: var(--spacing-sm);
            }
        }

        /* Article card */
        .article-card {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition-base);
            box-shadow: var(--shadow-low);
            display: flex;
            flex-direction: column;
        }

        .article-card:hover {
            border-color: var(--border-color-strong);
            box-shadow: var(--shadow-md), var(--shadow-accent);
            transform: translateY(-4px);
        }

        .article-card__image {
            aspect-ratio: 16 / 9;
            overflow: hidden;
            background-color: var(--bg-tertiary);
            position: relative;
        }

        .article-card__image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-slow);
        }

        .article-card:hover .article-card__image img {
            transform: scale(1.04);
        }

        .article-card__body {
            padding: var(--spacing-md);
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .article-card__category {
            display: inline-flex;
            align-items: center;
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 0.8px;
            color: var(--accent-primary);
            margin-bottom: var(--spacing-xs);
            text-transform: uppercase;
        }

        .article-card__title {
            font-size: 18px;
            font-weight: 600;
            line-height: 1.45;
            color: var(--text-primary);
            margin-bottom: var(--spacing-xs);
        }

        .article-card__title a {
            color: inherit;
            transition: color var(--transition-fast);
        }

        .article-card__title a:hover {
            color: var(--accent-primary-hover);
        }

        .article-card__excerpt {
            font-size: 14px;
            line-height: 1.7;
            color: var(--text-secondary);
            flex: 1;
            margin-bottom: var(--spacing-sm);
        }

        .article-card__meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 12px;
            color: var(--text-tertiary);
            padding-top: var(--spacing-xs);
            border-top: 1px solid var(--border-light);
        }

        .article-card__date {
            font-family: var(--font-mono);
            letter-spacing: 0.5px;
        }

        .article-card__read {
            color: var(--accent-primary);
            font-weight: 500;
        }

        /* Feature list card */
        .feature-list-card {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: var(--spacing-md);
            transition: all var(--transition-base);
            box-shadow: var(--shadow-low);
            display: flex;
            flex-direction: column;
            gap: var(--spacing-sm);
        }

        .feature-list-card:hover {
            border-color: var(--border-color-strong);
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

        .feature-list-card__num {
            font-family: var(--font-mono);
            font-size: 28px;
            font-weight: 700;
            color: var(--accent-primary);
            line-height: 1;
            margin-bottom: 4px;
        }

        .feature-list-card__title {
            font-size: 17px;
            font-weight: 600;
            color: var(--text-primary);
        }

        .feature-list-card__desc {
            font-size: 14px;
            line-height: 1.7;
            color: var(--text-secondary);
        }

        /* Process steps */
        .process-steps {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--spacing-md);
            counter-reset: step;
        }

        .process-step {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: var(--spacing-md);
            position: relative;
            counter-increment: step;
            transition: all var(--transition-base);
        }

        .process-step::before {
            content: counter(step, decimal-leading-zero);
            font-family: var(--font-mono);
            font-size: 48px;
            font-weight: 700;
            color: var(--accent-primary-dim);
            display: block;
            line-height: 1;
            margin-bottom: var(--spacing-sm);
            opacity: 0.6;
        }

        .process-step:hover {
            border-color: var(--border-color-strong);
            box-shadow: var(--shadow-md);
        }

        .process-step__title {
            font-size: 17px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: var(--spacing-xs);
        }

        .process-step__desc {
            font-size: 14px;
            line-height: 1.7;
            color: var(--text-secondary);
        }

        @media (max-width: 1024px) {
            .process-steps {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .process-steps {
                grid-template-columns: 1fr;
            }
            .process-step::before {
                font-size: 36px;
            }
        }

        /* Spec table */
        .spec-table-wrap {
            overflow-x: auto;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            background-color: var(--bg-secondary);
        }

        .spec-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 14px;
            min-width: 600px;
        }

        .spec-table thead {
            background-color: var(--bg-elevated);
        }

        .spec-table th {
            text-align: left;
            font-weight: 600;
            font-size: 13px;
            letter-spacing: 0.5px;
            color: var(--accent-secondary);
            padding: 14px 16px;
            border-bottom: 1px solid var(--border-color-strong);
            white-space: nowrap;
        }

        .spec-table td {
            padding: 12px 16px;
            color: var(--text-secondary);
            border-bottom: 1px solid var(--border-light);
            line-height: 1.6;
        }

        .spec-table tbody tr:last-child td {
            border-bottom: none;
        }

        .spec-table tbody tr:hover td {
            background-color: rgba(232, 139, 42, 0.04);
        }

        .spec-table td:first-child {
            font-weight: 500;
            color: var(--text-primary);
            white-space: nowrap;
        }

        /* Tip box */
        .tip-box {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-left: 4px solid var(--accent-primary);
            border-radius: var(--radius-md);
            padding: var(--spacing-md);
            display: flex;
            align-items: flex-start;
            gap: var(--spacing-sm);
            margin-bottom: var(--spacing-sm);
        }

        .tip-box__icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background-color: var(--accent-primary-dim);
            color: var(--accent-primary);
            font-size: 14px;
            font-weight: 700;
        }

        .tip-box__content {
            flex: 1;
        }

        .tip-box__title {
            font-size: 14px;
            font-weight: 600;
            color: var(--accent-primary);
            margin-bottom: 4px;
        }

        .tip-box__text {
            font-size: 14px;
            line-height: 1.7;
            color: var(--text-secondary);
        }

        /* Hot list */
        .hot-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: var(--spacing-xs);
        }

        .hot-list__item {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
            padding: var(--spacing-sm);
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
        }

        .hot-list__item:hover {
            border-color: var(--border-color-strong);
            background-color: var(--bg-elevated);
        }

        .hot-list__rank {
            font-family: var(--font-mono);
            font-size: 14px;
            font-weight: 700;
            color: var(--accent-primary);
            width: 28px;
            flex-shrink: 0;
        }

        .hot-list__label {
            flex: 1;
            font-size: 14px;
            color: var(--text-primary);
            line-height: 1.5;
        }

        .hot-list__badge {
            font-size: 11px;
            font-weight: 600;
            color: var(--accent-secondary);
            background-color: var(--accent-secondary-dim);
            padding: 2px 8px;
            border-radius: 999px;
            white-space: nowrap;
            flex-shrink: 0;
        }

        /* Subscribe */
        .subscribe-panel {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color-strong);
            border-radius: var(--radius-xl);
            padding: var(--spacing-lg);
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--spacing-lg);
            flex-wrap: wrap;
            background-image: linear-gradient(135deg, rgba(232, 139, 42, 0.08), rgba(184, 224, 230, 0.04));
        }

        .subscribe-panel__content {
            flex: 1;
            min-width: 260px;
        }

        .subscribe-panel__title {
            font-size: 20px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 4px;
        }

        .subscribe-panel__text {
            font-size: 14px;
            color: var(--text-secondary);
        }

        .subscribe-panel__form {
            display: flex;
            gap: var(--spacing-xs);
            flex-shrink: 0;
            max-width: 380px;
            width: 100%;
        }

        .subscribe-panel__form input {
            flex: 1;
            border-radius: var(--radius-sm);
            padding: 10px 14px;
            font-size: 14px;
        }

        @media (max-width: 768px) {
            .subscribe-panel {
                flex-direction: column;
                align-items: stretch;
                padding: var(--spacing-md);
            }
            .subscribe-panel__form {
                flex-direction: column;
                max-width: 100%;
            }
        }

        /* Inline image banner */
        .content-banner {
            border-radius: var(--radius-xl);
            overflow: hidden;
            border: 1px solid var(--border-color);
            background-color: var(--bg-secondary);
            position: relative;
            aspect-ratio: 21 / 9;
            min-height: 240px;
        }

        .content-banner img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            position: absolute;
            inset: 0;
        }

        .content-banner__overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(18, 22, 28, 0.75), rgba(18, 22, 28, 0.35));
            z-index: 1;
        }

        .content-banner__body {
            position: relative;
            z-index: 2;
            padding: var(--spacing-lg);
            display: flex;
            flex-direction: column;
            justify-content: flex-end;
            height: 100%;
        }

        .content-banner__title {
            font-size: 24px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 4px;
        }

        .content-banner__text {
            font-size: 14px;
            color: var(--text-secondary);
            max-width: 520px;
        }

        @media (max-width: 768px) {
            .content-banner {
                aspect-ratio: auto;
                min-height: 180px;
            }
            .content-banner__title {
                font-size: 19px;
            }
        }

        /* Footer */
        .site-footer {
            background-color: var(--bg-tertiary);
            border-top: 1px solid var(--border-light);
            padding: var(--spacing-xl) 0 var(--spacing-md);
            margin-top: var(--spacing-xl);
        }

        .footer-main {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: var(--spacing-lg);
            margin-bottom: var(--spacing-lg);
        }

        .footer-brand__text {
            font-size: 14px;
            line-height: 1.7;
            color: var(--text-secondary);
            margin-top: var(--spacing-sm);
            max-width: 320px;
        }

        .footer-col__title {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: var(--spacing-sm);
            letter-spacing: 0.5px;
        }

        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .footer-links a {
            font-size: 13px;
            color: var(--text-secondary);
            transition: color var(--transition-fast);
        }

        .footer-links a:hover {
            color: var(--accent-primary-hover);
        }

        .footer-bottom {
            border-top: 1px solid var(--border-light);
            padding-top: var(--spacing-sm);
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: var(--spacing-xs);
        }

        .footer-legal {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: var(--spacing-xs);
            font-size: 12px;
            color: var(--text-tertiary);
        }

        .footer-legal a {
            color: var(--text-tertiary);
            transition: color var(--transition-fast);
        }

        .footer-legal a:hover {
            color: var(--accent-primary);
        }

        .footer-legal span {
            white-space: nowrap;
        }

        @media (max-width: 1024px) {
            .footer-main {
                grid-template-columns: 1fr 1fr;
                gap: var(--spacing-md);
            }
        }

        @media (max-width: 768px) {
            .footer-main {
                grid-template-columns: 1fr;
                gap: var(--spacing-md);
            }
            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }
        }

        /* Background decorative grid */
        .decor-grid {
            position: absolute;
            inset: 0;
            background-image: linear-gradient(rgba(184, 224, 230, 0.03) 1px, transparent 1px),
                linear-gradient(90deg, rgba(184, 224, 230, 0.03) 1px, transparent 1px);
            background-size: 32px 32px;
            pointer-events: none;
            z-index: 0;
        }

        /* Tag chips */
        .tag-chips {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
        }

        .tag-chip {
            display: inline-flex;
            align-items: center;
            font-size: 12px;
            font-weight: 500;
            color: var(--text-secondary);
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            padding: 4px 12px;
            border-radius: 999px;
            transition: all var(--transition-fast);
        }

        .tag-chip:hover {
            color: var(--accent-primary);
            border-color: var(--border-color-strong);
            background-color: var(--accent-primary-dim);
        }

        /* Divider */
        .divider {
            border: none;
            border-top: 1px solid var(--border-light);
            margin: var(--spacing-lg) 0;
        }

/* roulang page: category2 */
:root {
            --bg-primary: #12161C;
            --bg-secondary: #1A2028;
            --bg-tertiary: #0E1216;
            --bg-elevated: #202A35;
            --accent-primary: #E88B2A;
            --accent-primary-hover: #F0A13C;
            --accent-primary-dim: rgba(232, 139, 42, 0.15);
            --accent-secondary: #B8E0E6;
            --accent-secondary-dim: rgba(184, 224, 230, 0.12);
            --text-primary: #ECE9E4;
            --text-secondary: #AAB2B8;
            --text-tertiary: #6E7A82;
            --border-color: rgba(240, 161, 60, 0.18);
            --border-color-strong: rgba(240, 161, 60, 0.35);
            --border-light: rgba(255, 255, 255, 0.08);
            --radius-sm: 10px;
            --radius-md: 14px;
            --radius-lg: 18px;
            --radius-xl: 24px;
            --shadow-low: 0 4px 16px rgba(0, 0, 0, 0.2);
            --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.25);
            --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.35);
            --shadow-accent: 0 8px 28px rgba(232, 139, 42, 0.18);
            --spacing-xs: 8px;
            --spacing-sm: 16px;
            --spacing-md: 24px;
            --spacing-lg: 40px;
            --spacing-xl: 64px;
            --spacing-xxl: 96px;
            --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Helvetica Neue', system-ui, sans-serif;
            --font-mono: 'JetBrains Mono', 'SF Mono', 'Courier New', Consolas, monospace;
            --transition-fast: 0.2s ease;
            --transition-base: 0.3s ease;
            --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
            --container-max: 1200px;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            font-size: 16px;
        }

        body {
            font-family: var(--font-body);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.7;
            font-size: 16px;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition-fast);
        }

        a:hover {
            color: var(--accent-primary-hover);
        }

        a:focus-visible {
            outline: 2px solid var(--accent-primary);
            outline-offset: 3px;
            border-radius: 4px;
        }

        button {
            font-family: var(--font-body);
            cursor: pointer;
            border: none;
            background: none;
            font-size: inherit;
            color: inherit;
            transition: all var(--transition-base);
        }

        button:focus-visible {
            outline: 2px solid var(--accent-primary);
            outline-offset: 3px;
        }

        input,
        select,
        textarea {
            font-family: var(--font-body);
            font-size: 16px;
            color: var(--text-primary);
            background-color: var(--bg-secondary);
            border: 1px solid rgba(255, 255, 255, 0.12);
            border-radius: var(--radius-sm);
            padding: 10px 14px;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
            width: 100%;
        }

        input::placeholder,
        textarea::placeholder {
            color: var(--text-tertiary);
        }

        input:focus,
        select:focus,
        textarea:focus {
            outline: none;
            border-color: var(--accent-primary);
            box-shadow: 0 0 0 3px rgba(232, 139, 42, 0.15);
        }

        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 var(--spacing-md);
            width: 100%;
        }

        .section {
            padding: var(--spacing-xl) 0;
            position: relative;
            scroll-margin-top: 80px;
        }

        .section--alt {
            background-color: var(--bg-secondary);
        }

        .section--tertiary {
            background-color: var(--bg-tertiary);
        }

        .section--compact {
            padding: var(--spacing-lg) 0;
        }

        .section-header {
            margin-bottom: var(--spacing-lg);
            max-width: 760px;
        }

        .section-header--center {
            margin-left: auto;
            margin-right: auto;
            text-align: center;
        }

        .section-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 1.5px;
            text-transform: uppercase;
            color: var(--accent-primary);
            background-color: var(--accent-primary-dim);
            padding: 6px 16px;
            border-radius: 999px;
            margin-bottom: var(--spacing-sm);
            border: 1px solid rgba(232, 139, 42, 0.2);
        }

        .section-tag--secondary {
            color: var(--accent-secondary);
            background-color: var(--accent-secondary-dim);
            border-color: rgba(184, 224, 230, 0.2);
        }

        .section-title {
            font-size: 32px;
            font-weight: 700;
            line-height: 1.3;
            color: var(--text-primary);
            letter-spacing: -0.5px;
            margin-bottom: var(--spacing-sm);
        }

        .section-desc {
            font-size: 17px;
            color: var(--text-secondary);
            line-height: 1.8;
            max-width: 720px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-weight: 600;
            font-size: 16px;
            padding: 14px 28px;
            border-radius: var(--radius-md);
            transition: all var(--transition-base);
            white-space: nowrap;
            cursor: pointer;
            border: 1px solid transparent;
        }

        .btn--primary {
            background-color: var(--accent-primary);
            color: #12161C;
            box-shadow: var(--shadow-accent);
        }

        .btn--primary:hover {
            background-color: var(--accent-primary-hover);
            color: #12161C;
            border-color: transparent;
            box-shadow: 0 10px 32px rgba(232, 139, 42, 0.3);
            transform: translateY(-2px);
        }

        .btn--primary:active {
            transform: translateY(1px);
            box-shadow: 0 4px 16px rgba(232, 139, 42, 0.25);
        }

        .btn--ghost {
            background-color: transparent;
            color: var(--text-primary);
            border-color: var(--border-color-strong);
        }

        .btn--ghost:hover {
            border-color: var(--accent-primary);
            background-color: var(--accent-primary-dim);
            color: var(--accent-primary-hover);
            transform: translateY(-2px);
        }

        .btn--ghost:active {
            transform: translateY(1px);
        }

        .btn--sm {
            padding: 10px 20px;
            font-size: 14px;
            border-radius: var(--radius-sm);
        }

        .btn--lg {
            padding: 16px 32px;
            font-size: 17px;
        }

        .btn:focus-visible {
            outline: 2px solid var(--accent-primary);
            outline-offset: 3px;
        }

/* 导航系统 */
        .site-header {
            background-color: rgba(18, 22, 28, 0.95);
            border-bottom: 1px solid var(--border-light);
            position: sticky;
            top: 0;
            z-index: 100;
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
        }
        .header-top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--spacing-md);
            padding: 14px 0;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 20px;
            color: var(--text-primary);
            white-space: nowrap;
            flex-shrink: 0;
        }
        .logo:hover {
            color: var(--accent-primary-hover);
        }
        .logo__icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            background-color: var(--accent-primary-dim);
            color: var(--accent-primary);
            border-radius: var(--radius-sm);
            font-weight: 800;
            font-size: 15px;
            letter-spacing: -0.5px;
            border: 1px solid var(--border-color);
        }
        .header-actions {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
            flex-shrink: 0;
        }
        .search-box {
            display: flex;
            align-items: center;
            gap: 8px;
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: 999px;
            padding: 8px 16px;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
            min-width: 220px;
        }
        .search-box:hover,
        .search-box:focus-within {
            border-color: var(--accent-primary);
            box-shadow: 0 0 0 3px rgba(232, 139, 42, 0.12);
        }
        .search-box__icon {
            color: var(--text-tertiary);
            font-size: 15px;
            flex-shrink: 0;
        }
        .search-box input {
            background: none;
            border: none;
            padding: 0;
            font-size: 14px;
            color: var(--text-primary);
            width: 100%;
            min-width: 0;
            box-shadow: none;
        }
        .search-box input:focus {
            box-shadow: none;
        }
        .search-box input::placeholder {
            color: var(--text-tertiary);
            font-size: 14px;
        }
        .header-nav {
            display: flex;
            gap: 4px;
            overflow-x: auto;
            padding-bottom: 10px;
            scrollbar-width: thin;
            scrollbar-color: var(--border-color-strong) transparent;
            -webkit-overflow-scrolling: touch;
        }
        .header-nav::-webkit-scrollbar {
            height: 4px;
        }
        .header-nav::-webkit-scrollbar-track {
            background: transparent;
        }
        .header-nav::-webkit-scrollbar-thumb {
            background-color: var(--border-color-strong);
            border-radius: 999px;
        }
        .nav-tab {
            display: inline-flex;
            align-items: center;
            padding: 10px 20px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: 999px;
            white-space: nowrap;
            transition: all var(--transition-base);
            border: 1px solid transparent;
            position: relative;
        }
        .nav-tab:hover {
            color: var(--text-primary);
            background-color: var(--bg-elevated);
        }
        .nav-tab--active {
            background-color: var(--accent-primary-dim);
            color: var(--accent-primary);
            border-color: var(--border-color-strong);
            font-weight: 600;
        }
        .nav-tab--active::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 24px;
            height: 3px;
            background-color: var(--accent-primary);
            border-radius: 999px;
        }
        @media (min-width: 768px) {
            .nav-tab--active::after {
                width: 32px;
            }
        }
        @media (max-width: 767px) {
            .header-top {
                flex-wrap: wrap;
                padding: 10px 0;
            }
            .search-box {
                min-width: 0;
                flex: 1;
                max-width: 180px;
            }
            .logo {
                font-size: 17px;
            }
            .logo__icon {
                width: 32px;
                height: 32px;
                font-size: 13px;
            }
            .btn--sm {
                padding: 8px 14px;
                font-size: 13px;
            }
            .header-nav {
                padding-bottom: 8px;
                gap: 2px;
            }
            .nav-tab {
                padding: 8px 14px;
                font-size: 14px;
            }
        }
        @media (max-width: 520px) {
            .header-actions {
                width: 100%;
                justify-content: space-between;
                margin-top: 8px;
            }
            .search-box {
                max-width: none;
            }
        }

/* 页脚系统 */
        .site-footer {
            background-color: var(--bg-tertiary);
            border-top: 1px solid var(--border-light);
            padding: var(--spacing-xl) 0 var(--spacing-md);
            margin-top: var(--spacing-xl);
        }
        .footer-main {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: var(--spacing-lg);
            margin-bottom: var(--spacing-lg);
        }
        .footer-brand__text {
            font-size: 14px;
            color: var(--text-secondary);
            margin-top: var(--spacing-sm);
            line-height: 1.8;
            max-width: 320px;
        }
        .footer-col__title {
            font-weight: 600;
            font-size: 16px;
            color: var(--text-primary);
            margin-bottom: var(--spacing-sm);
        }
        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-links a {
            font-size: 14px;
            color: var(--text-secondary);
            transition: color var(--transition-fast), padding-left var(--transition-fast);
        }
        .footer-links a:hover {
            color: var(--accent-primary-hover);
            padding-left: 4px;
        }
        .footer-bottom {
            border-top: 1px solid var(--border-light);
            padding-top: var(--spacing-md);
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: var(--spacing-sm);
            align-items: center;
        }
        .footer-legal {
            display: flex;
            flex-wrap: wrap;
            gap: var(--spacing-sm);
            align-items: center;
            font-size: 13px;
            color: var(--text-tertiary);
        }
        .footer-legal a {
            color: var(--text-secondary);
        }
        .footer-legal a:hover {
            color: var(--accent-primary-hover);
        }
        @media (max-width: 1023px) {
            .footer-main {
                grid-template-columns: 1fr 1fr;
                gap: var(--spacing-md);
            }
        }
        @media (max-width: 767px) {
            .footer-main {
                grid-template-columns: 1fr;
                gap: var(--spacing-md);
            }
            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }
        }

/* 页面特有样式：面包屑 + 分类页头 */
        .breadcrumb-bar {
            background-color: var(--bg-tertiary);
            border-bottom: 1px solid var(--border-light);
            padding: 10px 0;
            font-size: 13px;
            color: var(--text-tertiary);
        }
        .breadcrumb-bar .container {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
        }
        .breadcrumb-bar a {
            color: var(--text-secondary);
        }
        .breadcrumb-bar a:hover {
            color: var(--accent-primary-hover);
        }
        .breadcrumb-sep {
            color: var(--text-tertiary);
            font-size: 11px;
        }
        .breadcrumb-current {
            color: var(--accent-primary);
        }

        .page-hero-mini {
            background-color: var(--bg-tertiary);
            border-bottom: 1px solid var(--border-light);
            padding: var(--spacing-lg) 0;
            position: relative;
            overflow: hidden;
        }
        .page-hero-mini::before {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 520px;
            height: 100%;
            background: radial-gradient(ellipse at center, rgba(232, 139, 42, 0.08) 0%, transparent 70%);
            pointer-events: none;
        }
        .page-hero-mini .container {
            position: relative;
            z-index: 1;
        }
        .page-hero-mini .section-tag {
            margin-bottom: var(--spacing-sm);
        }
        .page-hero-mini h1 {
            font-size: 36px;
            font-weight: 700;
            line-height: 1.3;
            color: var(--text-primary);
            margin-bottom: var(--spacing-sm);
            letter-spacing: -0.5px;
        }
        .page-hero-mini .hero-desc {
            font-size: 17px;
            color: var(--text-secondary);
            max-width: 720px;
            line-height: 1.8;
        }
        .hero-stats-inline {
            display: flex;
            flex-wrap: wrap;
            gap: var(--spacing-md);
            margin-top: var(--spacing-md);
        }
        .hero-stat-item {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--text-tertiary);
            background-color: var(--bg-secondary);
            padding: 6px 14px;
            border-radius: 999px;
            border: 1px solid var(--border-light);
        }
        .hero-stat-item strong {
            color: var(--accent-primary);
            font-family: var(--font-mono);
            font-weight: 600;
        }
        @media (max-width: 767px) {
            .page-hero-mini h1 {
                font-size: 28px;
            }
            .page-hero-mini .hero-desc {
                font-size: 16px;
            }
            .hero-stats-inline {
                gap: var(--spacing-xs);
            }
        }

/* 文章卡片列表 */
        .article-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--spacing-md);
        }
        .article-card {
            display: flex;
            gap: var(--spacing-md);
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: var(--spacing-sm);
            transition: all var(--transition-base);
            text-align: left;
            min-height: 160px;
        }
        .article-card:hover {
            border-color: var(--accent-primary);
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .article-card__img {
            width: 140px;
            min-width: 140px;
            height: 140px;
            border-radius: var(--radius-md);
            overflow: hidden;
            background-color: var(--bg-elevated);
            flex-shrink: 0;
        }
        .article-card__img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-slow);
        }
        .article-card:hover .article-card__img img {
            transform: scale(1.05);
        }
        .article-card__body {
            flex: 1;
            display: flex;
            flex-direction: column;
            justify-content: center;
            padding: var(--spacing-xs) var(--spacing-xs) var(--spacing-xs) 0;
        }
        .article-card__tag {
            display: inline-flex;
            align-self: flex-start;
            font-size: 12px;
            font-weight: 500;
            color: var(--accent-secondary);
            background-color: var(--accent-secondary-dim);
            padding: 3px 10px;
            border-radius: 999px;
            margin-bottom: 6px;
        }
        .article-card__title {
            font-size: 17px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 6px;
            line-height: 1.4;
            transition: color var(--transition-fast);
        }
        .article-card:hover .article-card__title {
            color: var(--accent-primary-hover);
        }
        .article-card__excerpt {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        @media (max-width: 1023px) {
            .article-grid {
                grid-template-columns: 1fr;
            }
            .article-card__img {
                width: 120px;
                min-width: 120px;
                height: 120px;
            }
        }
        @media (max-width: 520px) {
            .article-card {
                flex-direction: column;
                gap: var(--spacing-xs);
            }
            .article-card__img {
                width: 100%;
                min-width: 100%;
                height: 160px;
            }
            .article-card__body {
                padding: var(--spacing-xs);
            }
        }

/* 参数速查表 */
        .param-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--spacing-sm);
        }
        .param-card {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: var(--spacing-md);
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
        }
        .param-card:hover {
            border-color: var(--border-color-strong);
            box-shadow: var(--shadow-low);
        }
        .param-card__label {
            font-size: 13px;
            color: var(--text-tertiary);
            margin-bottom: 5px;
            letter-spacing: 0.5px;
        }
        .param-card__value {
            font-family: var(--font-mono);
            font-size: 22px;
            font-weight: 600;
            color: var(--accent-primary);
            margin-bottom: 4px;
            word-break: break-all;
        }
        .param-card__note {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.5;
        }
        @media (max-width: 1023px) {
            .param-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 520px) {
            .param-grid {
                grid-template-columns: 1fr;
            }
        }

/* 调优数据指标 */
        .metrics-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--spacing-sm);
        }
        .metric-card {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: var(--spacing-md);
            text-align: center;
            transition: all var(--transition-base);
        }
        .metric-card:hover {
            border-color: var(--accent-primary);
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .metric-card__value {
            font-family: var(--font-mono);
            font-size: 32px;
            font-weight: 700;
            color: var(--accent-primary);
            line-height: 1.2;
            margin-bottom: 4px;
        }
        .metric-card__label {
            font-size: 14px;
            color: var(--text-secondary);
            font-weight: 500;
        }
        .metric-card__note {
            font-size: 12px;
            color: var(--text-tertiary);
            margin-top: 4px;
        }
        @media (max-width: 1023px) {
            .metrics-row {
                grid-template-columns: 1fr 1fr;
            }
            .metric-card__value {
                font-size: 28px;
            }
        }
        @media (max-width: 520px) {
            .metrics-row {
                grid-template-columns: 1fr;
            }
        }

/* 场景化配置推荐 */
        .scenario-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--spacing-md);
        }
        .scenario-card {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition-base);
        }
        .scenario-card:hover {
            border-color: var(--accent-primary);
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
        }
        .scenario-card__img {
            height: 160px;
            overflow: hidden;
            background-color: var(--bg-elevated);
        }
        .scenario-card__img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-slow);
        }
        .scenario-card:hover .scenario-card__img img {
            transform: scale(1.04);
        }
        .scenario-card__body {
            padding: var(--spacing-md);
        }
        .scenario-card__title {
            font-size: 17px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 6px;
        }
        .scenario-card__desc {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        .scenario-card__items {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
            margin-top: var(--spacing-xs);
        }
        .scenario-card__chip {
            font-size: 12px;
            padding: 3px 10px;
            background-color: var(--accent-primary-dim);
            color: var(--accent-primary);
            border-radius: 999px;
            border: 1px solid var(--border-color);
        }
        @media (max-width: 1023px) {
            .scenario-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 767px) {
            .scenario-grid {
                grid-template-columns: 1fr;
            }
        }

/* FAQ样式 */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: var(--spacing-sm);
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: border-color var(--transition-fast);
        }
        .faq-item:hover {
            border-color: var(--border-color-strong);
        }
        .faq-item__question {
            padding: var(--spacing-md);
            font-weight: 600;
            font-size: 16px;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--spacing-sm);
            cursor: pointer;
            user-select: none;
            transition: background-color var(--transition-fast);
        }
        .faq-item__question:hover {
            background-color: var(--bg-elevated);
        }
        .faq-item__icon {
            font-size: 13px;
            color: var(--accent-primary);
            flex-shrink: 0;
            transition: transform var(--transition-base);
        }
        .faq-item.open .faq-item__icon {
            transform: rotate(180deg);
        }
        .faq-item__answer {
            padding: 0 var(--spacing-md) var(--spacing-md);
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.8;
            display: none;
        }
        .faq-item.open .faq-item__answer {
            display: block;
        }

/* CTA转化区 */
        .cta-band {
            background-color: var(--bg-tertiary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-xl);
            padding: var(--spacing-lg);
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-band::before {
            content: '';
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 600px;
            height: 200px;
            background: radial-gradient(ellipse at center, rgba(232, 139, 42, 0.12) 0%, transparent 70%);
            pointer-events: none;
        }
        .cta-band__title {
            font-size: 28px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: var(--spacing-sm);
            position: relative;
            z-index: 1;
        }
        .cta-band__desc {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 560px;
            margin: 0 auto var(--spacing-md);
            line-height: 1.8;
            position: relative;
            z-index: 1;
        }
        .cta-band__actions {
            display: flex;
            gap: var(--spacing-sm);
            justify-content: center;
            flex-wrap: wrap;
            position: relative;
            z-index: 1;
        }
        @media (max-width: 767px) {
            .cta-band__title {
                font-size: 24px;
            }
            .cta-band {
                padding: var(--spacing-md);
            }
        }

/* 提示条 */
        .tip-banner {
            background-color: var(--accent-primary-dim);
            border: 1px solid var(--border-color-strong);
            border-radius: var(--radius-md);
            padding: var(--spacing-md) var(--spacing-lg);
            display: flex;
            align-items: flex-start;
            gap: var(--spacing-sm);
            max-width: 800px;
            margin: 0 auto;
        }
        .tip-banner__icon {
            font-size: 22px;
            flex-shrink: 0;
            color: var(--accent-primary);
            margin-top: 2px;
        }
        .tip-banner__text {
            font-size: 15px;
            color: var(--text-primary);
            line-height: 1.7;
        }
        .tip-banner__text strong {
            color: var(--accent-primary);
        }
        @media (max-width: 520px) {
            .tip-banner {
                padding: var(--spacing-sm);
                flex-direction: column;
            }
        }

/* roulang page: category3 */
:root {
            --bg-primary: #12161C;
            --bg-secondary: #1A2028;
            --bg-tertiary: #0E1216;
            --bg-elevated: #202A35;
            --accent-primary: #E88B2A;
            --accent-primary-hover: #F0A13C;
            --accent-primary-dim: rgba(232, 139, 42, 0.15);
            --accent-secondary: #B8E0E6;
            --accent-secondary-dim: rgba(184, 224, 230, 0.12);
            --text-primary: #ECE9E4;
            --text-secondary: #AAB2B8;
            --text-tertiary: #6E7A82;
            --border-color: rgba(240, 161, 60, 0.18);
            --border-color-strong: rgba(240, 161, 60, 0.35);
            --border-light: rgba(255, 255, 255, 0.08);
            --radius-sm: 10px;
            --radius-md: 14px;
            --radius-lg: 18px;
            --radius-xl: 24px;
            --shadow-low: 0 4px 16px rgba(0, 0, 0, 0.2);
            --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.25);
            --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.35);
            --shadow-accent: 0 8px 28px rgba(232, 139, 42, 0.18);
            --spacing-xs: 8px;
            --spacing-sm: 16px;
            --spacing-md: 24px;
            --spacing-lg: 40px;
            --spacing-xl: 64px;
            --spacing-xxl: 96px;
            --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Helvetica Neue', system-ui, sans-serif;
            --font-mono: 'JetBrains Mono', 'SF Mono', 'Courier New', Consolas, monospace;
            --transition-fast: 0.2s ease;
            --transition-base: 0.3s ease;
            --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
            --container-max: 1200px;
        }

        * {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            font-size: 16px;
        }

        body {
            font-family: var(--font-body);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.7;
            font-size: 16px;
            overflow-x: hidden;
            min-height: 100vh;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition-fast);
        }

        a:hover {
            color: var(--accent-primary-hover);
        }

        a:focus-visible {
            outline: 2px solid var(--accent-primary);
            outline-offset: 3px;
            border-radius: 4px;
        }

        button {
            font-family: var(--font-body);
            cursor: pointer;
            border: none;
            background: none;
            font-size: inherit;
            color: inherit;
            transition: all var(--transition-base);
        }

        button:focus-visible {
            outline: 2px solid var(--accent-primary);
            outline-offset: 3px;
        }

        input,
        select,
        textarea {
            font-family: var(--font-body);
            font-size: 16px;
            color: var(--text-primary);
            background-color: var(--bg-secondary);
            border: 1px solid rgba(255, 255, 255, 0.12);
            border-radius: var(--radius-sm);
            padding: 10px 14px;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
            width: 100%;
        }

        input::placeholder,
        textarea::placeholder {
            color: var(--text-tertiary);
        }

        input:focus,
        select:focus,
        textarea:focus {
            outline: none;
            border-color: var(--accent-primary);
            box-shadow: 0 0 0 3px rgba(232, 139, 42, 0.15);
        }

        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 var(--spacing-md);
            width: 100%;
        }

        .section {
            padding: var(--spacing-xl) 0;
            position: relative;
        }

        .section--alt {
            background-color: var(--bg-secondary);
        }

        .section--tertiary {
            background-color: var(--bg-tertiary);
        }

        .section--compact {
            padding: var(--spacing-lg) 0;
        }

        .section-header {
            margin-bottom: var(--spacing-lg);
            max-width: 760px;
        }

        .section-header--center {
            margin-left: auto;
            margin-right: auto;
            text-align: center;
        }

        .section-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 1.5px;
            text-transform: uppercase;
            color: var(--accent-primary);
            background-color: var(--accent-primary-dim);
            padding: 6px 16px;
            border-radius: 999px;
            margin-bottom: var(--spacing-sm);
            border: 1px solid rgba(232, 139, 42, 0.2);
        }

        .section-tag--secondary {
            color: var(--accent-secondary);
            background-color: var(--accent-secondary-dim);
            border-color: rgba(184, 224, 230, 0.2);
        }

        .section-title {
            font-size: 32px;
            font-weight: 800;
            line-height: 1.3;
            margin-bottom: var(--spacing-sm);
            color: var(--text-primary);
            letter-spacing: -0.5px;
        }

        .section-subtitle {
            font-size: 17px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 0;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-weight: 600;
            font-size: 15px;
            padding: 12px 28px;
            border-radius: 999px;
            transition: all var(--transition-base);
            border: 1px solid transparent;
            white-space: nowrap;
            letter-spacing: 0.3px;
        }

        .btn--primary {
            background-color: var(--accent-primary);
            color: #12161C;
            border-color: var(--accent-primary);
            box-shadow: var(--shadow-accent);
        }

        .btn--primary:hover {
            background-color: var(--accent-primary-hover);
            border-color: var(--accent-primary-hover);
            color: #12161C;
            transform: translateY(-1px);
            box-shadow: 0 12px 32px rgba(232, 139, 42, 0.28);
        }

        .btn--primary:active {
            transform: translateY(1px);
            box-shadow: 0 4px 12px rgba(232, 139, 42, 0.2);
        }

        .btn--primary:focus-visible {
            outline: 2px solid var(--accent-primary);
            outline-offset: 3px;
        }

        .btn--outline {
            background-color: transparent;
            color: var(--text-primary);
            border-color: var(--border-color-strong);
        }

        .btn--outline:hover {
            background-color: var(--accent-primary-dim);
            border-color: var(--accent-primary);
            color: var(--accent-primary-hover);
            transform: translateY(-1px);
        }

        .btn--outline:active {
            transform: translateY(1px);
        }

        .btn--sm {
            font-size: 14px;
            padding: 8px 18px;
        }

        .btn--lg {
            font-size: 17px;
            padding: 16px 36px;
        }

        /* Header / Nav */
        .site-header {
            background-color: rgba(18, 22, 28, 0.96);
            border-bottom: 1px solid var(--border-light);
            position: sticky;
            top: 0;
            z-index: 1000;
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
        }

        .header-top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: var(--spacing-sm) 0;
            gap: var(--spacing-md);
            flex-wrap: wrap;
        }

        .logo {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 20px;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: 0.5px;
            white-space: nowrap;
        }

        .logo__icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--accent-primary), #c96a1e);
            color: #12161C;
            font-weight: 900;
            font-size: 14px;
            border-radius: 10px;
            letter-spacing: -0.5px;
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
        }

        .search-box {
            display: flex;
            align-items: center;
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: 999px;
            padding: 4px 14px;
            gap: 8px;
            min-width: 220px;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
        }

        .search-box:focus-within {
            border-color: var(--accent-primary);
            box-shadow: 0 0 0 3px rgba(232, 139, 42, 0.12);
        }

        .search-box__icon {
            font-size: 14px;
            color: var(--text-tertiary);
            flex-shrink: 0;
        }

        .search-box input {
            border: none;
            background: transparent;
            padding: 8px 0;
            font-size: 14px;
            color: var(--text-primary);
            flex: 1;
            min-width: 0;
        }

        .search-box input:focus {
            outline: none;
            box-shadow: none;
        }

        .search-box input::placeholder {
            color: var(--text-tertiary);
            font-size: 13px;
        }

        .header-nav {
            display: flex;
            gap: 4px;
            overflow-x: auto;
            padding-bottom: var(--spacing-xs);
            -webkit-overflow-scrolling: touch;
            scrollbar-width: thin;
            scrollbar-color: var(--border-color-strong) transparent;
        }

        .header-nav::-webkit-scrollbar {
            height: 4px;
        }

        .header-nav::-webkit-scrollbar-track {
            background: transparent;
        }

        .header-nav::-webkit-scrollbar-thumb {
            background-color: var(--border-color-strong);
            border-radius: 999px;
        }

        .nav-tab {
            display: inline-flex;
            align-items: center;
            padding: 10px 20px;
            font-size: 14px;
            font-weight: 600;
            color: var(--text-secondary);
            border-radius: 999px;
            white-space: nowrap;
            transition: all var(--transition-fast);
            border: 1px solid transparent;
            position: relative;
        }

        .nav-tab:hover {
            color: var(--text-primary);
            background-color: var(--accent-primary-dim);
        }

        .nav-tab--active {
            color: var(--accent-primary);
            background-color: var(--accent-primary-dim);
            border-color: rgba(232, 139, 42, 0.25);
        }

        .nav-tab--active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 50%;
            transform: translateX(-50%);
            width: 24px;
            height: 3px;
            background-color: var(--accent-primary);
            border-radius: 999px;
        }

        /* Breadcrumb */
        .breadcrumb-wrapper {
            padding: var(--spacing-md) 0 0;
        }

        .custom-breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--text-tertiary);
            flex-wrap: wrap;
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .custom-breadcrumb li {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .custom-breadcrumb li:not(:last-child)::after {
            content: '/';
            color: var(--text-tertiary);
            font-size: 12px;
        }

        .custom-breadcrumb a {
            color: var(--text-secondary);
            transition: color var(--transition-fast);
        }

        .custom-breadcrumb a:hover {
            color: var(--accent-primary);
        }

        .custom-breadcrumb .current {
            color: var(--accent-primary);
            font-weight: 600;
        }

        /* Category Hero */
        .category-hero {
            padding: var(--spacing-lg) 0 var(--spacing-md);
            position: relative;
        }

        .category-hero__pattern {
            position: absolute;
            inset: 0;
            background-image: radial-gradient(circle at 20% 30%, rgba(232, 139, 42, 0.04) 0%, transparent 60%),
                radial-gradient(circle at 80% 70%, rgba(184, 224, 230, 0.03) 0%, transparent 50%);
            pointer-events: none;
        }

        .category-hero__content {
            position: relative;
            z-index: 1;
        }

        .category-hero__title {
            font-size: 38px;
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: var(--spacing-sm);
            letter-spacing: -0.5px;
            color: var(--text-primary);
        }

        .category-hero__desc {
            font-size: 17px;
            color: var(--text-secondary);
            line-height: 1.9;
            max-width: 820px;
            margin-bottom: var(--spacing-md);
        }

        .category-hero__meta {
            display: flex;
            gap: var(--spacing-md);
            flex-wrap: wrap;
            font-size: 13px;
            color: var(--text-tertiary);
        }

        .category-hero__meta span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            padding: 6px 14px;
            border-radius: 999px;
        }

        /* Article Cards */
        .article-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--spacing-md);
        }

        .article-card {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition-base);
            display: flex;
            flex-direction: column;
            height: 100%;
        }

        .article-card:hover {
            border-color: var(--accent-primary);
            box-shadow: var(--shadow-md), var(--shadow-accent);
            transform: translateY(-4px);
        }

        .article-card__image {
            position: relative;
            aspect-ratio: 16/9;
            overflow: hidden;
        }

        .article-card__image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-slow);
        }

        .article-card:hover .article-card__image img {
            transform: scale(1.04);
        }

        .article-card__badge {
            position: absolute;
            top: 12px;
            left: 12px;
            background-color: rgba(18, 22, 28, 0.85);
            color: var(--accent-primary);
            font-size: 12px;
            font-weight: 700;
            padding: 4px 12px;
            border-radius: 999px;
            border: 1px solid var(--border-color-strong);
            letter-spacing: 0.5px;
        }

        .article-card__body {
            padding: var(--spacing-md);
            display: flex;
            flex-direction: column;
            flex: 1;
            gap: 10px;
        }

        .article-card__title {
            font-size: 18px;
            font-weight: 700;
            line-height: 1.45;
            color: var(--text-primary);
            margin: 0;
            letter-spacing: -0.2px;
        }

        .article-card__title a {
            color: inherit;
            transition: color var(--transition-fast);
        }

        .article-card__title a:hover {
            color: var(--accent-primary);
        }

        .article-card__summary {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.75;
            margin: 0;
            flex: 1;
        }

        .article-card__footer {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--spacing-sm);
            font-size: 12px;
            color: var(--text-tertiary);
            padding-top: var(--spacing-xs);
            border-top: 1px solid var(--border-light);
        }

        .article-card__readmore {
            color: var(--accent-primary);
            font-weight: 600;
            font-size: 13px;
            display: inline-flex;
            align-items: center;
            gap: 4px;
            transition: color var(--transition-fast);
        }

        .article-card__readmore:hover {
            color: var(--accent-primary-hover);
        }

        /* Hot Items */
        .hot-items {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--spacing-md);
        }

        .hot-item {
            background-color: var(--bg-elevated);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: var(--spacing-md);
            transition: all var(--transition-base);
            display: flex;
            gap: var(--spacing-sm);
            align-items: flex-start;
        }

        .hot-item:hover {
            border-color: var(--accent-primary);
            box-shadow: var(--shadow-low);
            transform: translateY(-2px);
        }

        .hot-item__rank {
            font-family: var(--font-mono);
            font-size: 26px;
            font-weight: 700;
            color: var(--accent-primary);
            line-height: 1;
            flex-shrink: 0;
            min-width: 34px;
        }

        .hot-item__content h4 {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0 0 6px;
            line-height: 1.4;
        }

        .hot-item__content p {
            font-size: 13px;
            color: var(--text-secondary);
            margin: 0;
            line-height: 1.65;
        }

        /* Tag Cloud */
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }

        .tag-cloud__item {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            font-size: 13px;
            font-weight: 500;
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: 999px;
            color: var(--text-secondary);
            transition: all var(--transition-fast);
        }

        .tag-cloud__item:hover {
            border-color: var(--accent-primary);
            color: var(--accent-primary);
            background-color: var(--accent-primary-dim);
        }

        .tag-cloud__item--accent {
            border-color: var(--border-color-strong);
            color: var(--accent-primary);
            background-color: var(--accent-primary-dim);
        }

        /* Tip Banner */
        .tip-banner {
            background: linear-gradient(135deg, rgba(232, 139, 42, 0.12), rgba(184, 224, 230, 0.06));
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: var(--spacing-lg);
            display: flex;
            align-items: flex-start;
            gap: var(--spacing-md);
        }

        .tip-banner__icon {
            font-size: 28px;
            flex-shrink: 0;
            line-height: 1;
            color: var(--accent-primary);
        }

        .tip-banner__content h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0 0 8px;
        }

        .tip-banner__content p {
            font-size: 15px;
            color: var(--text-secondary);
            margin: 0;
            line-height: 1.8;
        }

        /* Subscribe */
        .subscribe-box {
            background-color: var(--bg-elevated);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: var(--spacing-lg);
            text-align: center;
        }

        .subscribe-box h3 {
            font-size: 22px;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0 0 10px;
        }

        .subscribe-box p {
            font-size: 15px;
            color: var(--text-secondary);
            margin: 0 0 var(--spacing-md);
            line-height: 1.7;
        }

        .subscribe-form {
            display: flex;
            gap: var(--spacing-sm);
            max-width: 480px;
            margin: 0 auto;
            flex-wrap: wrap;
            justify-content: center;
        }

        .subscribe-form input {
            flex: 1;
            min-width: 200px;
            max-width: 320px;
        }

        /* FAQ */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: var(--spacing-sm);
        }

        .faq-item {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition-fast);
        }

        .faq-item:hover {
            border-color: var(--border-color-strong);
        }

        .faq-item__question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--spacing-sm);
            padding: var(--spacing-md);
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            text-align: left;
            transition: color var(--transition-fast);
        }

        .faq-item__question:hover {
            color: var(--accent-primary);
        }

        .faq-item__icon {
            font-size: 18px;
            color: var(--accent-primary);
            transition: transform var(--transition-base);
            flex-shrink: 0;
        }

        .faq-item.active .faq-item__icon {
            transform: rotate(45deg);
        }

        .faq-item__answer {
            padding: 0 var(--spacing-md) var(--spacing-md);
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.8;
            display: none;
        }

        .faq-item.active .faq-item__answer {
            display: block;
        }

        /* CTA Section */
        .cta-section {
            background: linear-gradient(135deg, rgba(232, 139, 42, 0.08), rgba(18, 22, 28, 0.9)),
                url('/assets/images/90fe29bbba55f237.webp') center/cover no-repeat;
            border-radius: var(--radius-xl);
            padding: var(--spacing-xl) var(--spacing-lg);
            text-align: center;
            border: 1px solid var(--border-color);
            position: relative;
            overflow: hidden;
        }

        .cta-section__overlay {
            position: absolute;
            inset: 0;
            background: rgba(18, 22, 28, 0.75);
            pointer-events: none;
        }

        .cta-section__content {
            position: relative;
            z-index: 1;
        }

        .cta-section h2 {
            font-size: 30px;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: var(--spacing-sm);
            letter-spacing: -0.5px;
        }

        .cta-section p {
            font-size: 16px;
            color: var(--text-secondary);
            margin-bottom: var(--spacing-md);
            line-height: 1.8;
        }

        /* Footer */
        .site-footer {
            background-color: var(--bg-tertiary);
            border-top: 1px solid var(--border-light);
            padding: var(--spacing-xl) 0 var(--spacing-lg);
            margin-top: var(--spacing-xl);
        }

        .footer-main {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: var(--spacing-lg);
            margin-bottom: var(--spacing-lg);
        }

        .footer-brand .logo {
            font-size: 18px;
            margin-bottom: var(--spacing-sm);
        }

        .footer-brand__text {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin: 0;
        }

        .footer-col__title {
            font-size: 14px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: var(--spacing-sm);
            letter-spacing: 0.5px;
        }

        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .footer-links a {
            font-size: 14px;
            color: var(--text-secondary);
            transition: color var(--transition-fast);
        }

        .footer-links a:hover {
            color: var(--accent-primary);
        }

        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--spacing-md);
            flex-wrap: wrap;
            padding-top: var(--spacing-md);
            border-top: 1px solid var(--border-light);
        }

        .footer-legal {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
            flex-wrap: wrap;
            font-size: 13px;
            color: var(--text-tertiary);
        }

        .footer-legal a {
            color: var(--text-tertiary);
            transition: color var(--transition-fast);
        }

        .footer-legal a:hover {
            color: var(--accent-primary);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            :root {
                --spacing-xl: 48px;
                --spacing-xxl: 72px;
            }

            .article-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .hot-items {
                grid-template-columns: repeat(2, 1fr);
            }

            .footer-main {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            :root {
                --spacing-xl: 40px;
                --spacing-xxl: 56px;
                --spacing-lg: 28px;
            }

            .section-title {
                font-size: 26px;
            }

            .category-hero__title {
                font-size: 28px;
            }

            .article-grid {
                grid-template-columns: 1fr;
            }

            .hot-items {
                grid-template-columns: 1fr;
            }

            .header-top {
                flex-direction: column;
                align-items: stretch;
                gap: var(--spacing-sm);
            }

            .header-actions {
                justify-content: space-between;
                width: 100%;
            }

            .search-box {
                min-width: 0;
                flex: 1;
            }

            .header-nav {
                padding-bottom: var(--spacing-xs);
            }

            .nav-tab {
                padding: 8px 16px;
                font-size: 13px;
            }

            .footer-main {
                grid-template-columns: 1fr;
                gap: var(--spacing-md);
            }

            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: var(--spacing-sm);
            }

            .tip-banner {
                flex-direction: column;
                padding: var(--spacing-md);
            }

            .cta-section {
                padding: var(--spacing-lg) var(--spacing-md);
            }

            .cta-section h2 {
                font-size: 24px;
            }
        }

        @media (max-width: 520px) {
            .category-hero__title {
                font-size: 24px;
            }

            .article-card__title {
                font-size: 16px;
            }

            .article-card__summary {
                font-size: 13px;
            }

            .subscribe-form {
                flex-direction: column;
            }

            .subscribe-form input {
                max-width: 100%;
            }

            .btn {
                padding: 10px 22px;
                font-size: 14px;
            }
        }

        /* Bootstrap overrides */
        .container {
            max-width: var(--container-max);
            padding-left: var(--spacing-md);
            padding-right: var(--spacing-md);
        }

        .row {
            --bs-gutter-x: var(--spacing-md);
        }

        .badge {
            font-weight: 600;
            letter-spacing: 0.3px;
        }

/* roulang page: category4 */
:root {
            --bg-primary: #12161C;
            --bg-secondary: #1A2028;
            --bg-tertiary: #0E1216;
            --bg-elevated: #202A35;
            --accent-primary: #E88B2A;
            --accent-primary-hover: #F0A13C;
            --accent-primary-dim: rgba(232, 139, 42, 0.15);
            --accent-secondary: #B8E0E6;
            --accent-secondary-dim: rgba(184, 224, 230, 0.12);
            --text-primary: #ECE9E4;
            --text-secondary: #AAB2B8;
            --text-tertiary: #6E7A82;
            --border-color: rgba(240, 161, 60, 0.18);
            --border-color-strong: rgba(240, 161, 60, 0.35);
            --border-light: rgba(255, 255, 255, 0.08);
            --radius-sm: 10px;
            --radius-md: 14px;
            --radius-lg: 18px;
            --radius-xl: 24px;
            --shadow-low: 0 4px 16px rgba(0, 0, 0, 0.2);
            --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.25);
            --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.35);
            --shadow-accent: 0 8px 28px rgba(232, 139, 42, 0.18);
            --spacing-xs: 8px;
            --spacing-sm: 16px;
            --spacing-md: 24px;
            --spacing-lg: 40px;
            --spacing-xl: 64px;
            --spacing-xxl: 96px;
            --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Helvetica Neue', system-ui, sans-serif;
            --font-mono: 'JetBrains Mono', 'SF Mono', 'Courier New', Consolas, monospace;
            --transition-fast: 0.2s ease;
            --transition-base: 0.3s ease;
            --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
            --container-max: 1200px;
        }
        @media (max-width: 1023px) {
            :root {
                --spacing-xl: 48px;
                --spacing-xxl: 72px;
            }
        }
        @media (max-width: 767px) {
            :root {
                --spacing-xl: 40px;
                --spacing-xxl: 56px;
                --spacing-lg: 28px;
                --spacing-md: 20px;
            }
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            font-size: 16px;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        body {
            font-family: var(--font-body);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.7;
            font-size: 16px;
            overflow-x: hidden;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition-fast);
        }
        a:hover {
            color: var(--accent-primary-hover);
        }
        a:focus-visible {
            outline: 2px solid var(--accent-primary);
            outline-offset: 3px;
            border-radius: 4px;
        }
        button {
            font-family: var(--font-body);
            cursor: pointer;
            border: none;
            background: none;
            font-size: inherit;
            color: inherit;
            transition: all var(--transition-base);
        }
        button:focus-visible {
            outline: 2px solid var(--accent-primary);
            outline-offset: 3px;
        }
        input,
        select,
        textarea {
            font-family: var(--font-body);
            font-size: 16px;
            color: var(--text-primary);
            background-color: var(--bg-secondary);
            border: 1px solid rgba(255, 255, 255, 0.12);
            border-radius: var(--radius-sm);
            padding: 10px 14px;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
            width: 100%;
        }
        input::placeholder,
        textarea::placeholder {
            color: var(--text-tertiary);
        }
        input:focus,
        select:focus,
        textarea:focus {
            outline: none;
            border-color: var(--accent-primary);
            box-shadow: 0 0 0 3px rgba(232, 139, 42, 0.15);
        }
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 var(--spacing-md);
            width: 100%;
        }
        .section {
            padding: var(--spacing-xl) 0;
            position: relative;
        }
        .section--alt {
            background-color: var(--bg-secondary);
        }
        .section--tertiary {
            background-color: var(--bg-tertiary);
        }
        .section--compact {
            padding: var(--spacing-lg) 0;
        }
        .section-header {
            margin-bottom: var(--spacing-lg);
            max-width: 760px;
        }
        .section-header--center {
            margin-left: auto;
            margin-right: auto;
            text-align: center;
        }
        .section-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 1.5px;
            text-transform: uppercase;
            color: var(--accent-primary);
            background-color: var(--accent-primary-dim);
            padding: 6px 16px;
            border-radius: 999px;
            margin-bottom: var(--spacing-sm);
            border: 1px solid rgba(232, 139, 42, 0.2);
        }
        .section-tag--secondary {
            color: var(--accent-secondary);
            background-color: var(--accent-secondary-dim);
            border-color: rgba(184, 224, 230, 0.2);
        }
        .section-title {
            font-size: 30px;
            font-weight: 700;
            line-height: 1.3;
            color: var(--text-primary);
            margin-bottom: var(--spacing-sm);
            letter-spacing: -0.01em;
        }
        .section-title--lg {
            font-size: 36px;
        }
        .section-desc {
            font-size: 16px;
            color: var(--text-secondary);
            line-height: 1.8;
        }
        @media (max-width: 767px) {
            .section-title {
                font-size: 24px;
            }
            .section-title--lg {
                font-size: 28px;
            }
            .section-desc {
                font-size: 15px;
            }
        }
        /* Header */
        .site-header {
            background-color: var(--bg-tertiary);
            border-bottom: 1px solid var(--border-light);
            position: sticky;
            top: 0;
            z-index: 1000;
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
        }
        .header-top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--spacing-sm);
            padding: var(--spacing-sm) 0;
            flex-wrap: wrap;
        }
        .logo {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: 0.02em;
            white-space: nowrap;
        }
        .logo:hover {
            color: var(--accent-primary-hover);
        }
        .logo__icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            background-color: var(--accent-primary);
            color: #12161C;
            font-size: 14px;
            font-weight: 800;
            border-radius: var(--radius-md);
            letter-spacing: -0.02em;
            flex-shrink: 0;
        }
        .header-actions {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
            flex-shrink: 0;
        }
        .search-box {
            display: flex;
            align-items: center;
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: 999px;
            padding: 6px 14px;
            gap: 8px;
            min-width: 200px;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
        }
        .search-box:focus-within {
            border-color: var(--accent-primary);
            box-shadow: 0 0 0 3px rgba(232, 139, 42, 0.12);
        }
        .search-box__icon {
            font-size: 14px;
            color: var(--text-tertiary);
            flex-shrink: 0;
        }
        .search-box input {
            border: none;
            background: transparent;
            padding: 4px 0;
            font-size: 14px;
            color: var(--text-primary);
            outline: none;
            box-shadow: none;
            min-width: 0;
        }
        .search-box input::placeholder {
            color: var(--text-tertiary);
            font-size: 13px;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-weight: 600;
            font-size: 15px;
            padding: 12px 24px;
            border-radius: 999px;
            transition: all var(--transition-base);
            white-space: nowrap;
            border: 1px solid transparent;
            line-height: 1.4;
        }
        .btn--primary {
            background-color: var(--accent-primary);
            color: #12161C;
            box-shadow: var(--shadow-accent);
        }
        .btn--primary:hover {
            background-color: var(--accent-primary-hover);
            box-shadow: 0 10px 32px rgba(232, 139, 42, 0.28);
            color: #12161C;
            transform: translateY(-1px);
        }
        .btn--primary:active {
            transform: translateY(0);
            box-shadow: var(--shadow-low);
        }
        .btn--ghost {
            background-color: transparent;
            color: var(--text-primary);
            border-color: var(--border-light);
        }
        .btn--ghost:hover {
            border-color: var(--accent-primary);
            color: var(--accent-primary-hover);
            background-color: var(--accent-primary-dim);
        }
        .btn--sm {
            padding: 8px 18px;
            font-size: 14px;
        }
        .btn--md {
            padding: 10px 22px;
            font-size: 15px;
        }
        .header-nav {
            display: flex;
            align-items: center;
            gap: 4px;
            padding: 0 0 var(--spacing-xs) 0;
            overflow-x: auto;
            scrollbar-width: thin;
            scrollbar-color: var(--border-color-strong) transparent;
            -webkit-overflow-scrolling: touch;
        }
        .header-nav::-webkit-scrollbar {
            height: 4px;
        }
        .header-nav::-webkit-scrollbar-track {
            background: transparent;
        }
        .header-nav::-webkit-scrollbar-thumb {
            background-color: var(--border-color-strong);
            border-radius: 999px;
        }
        .nav-tab {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 9px 18px;
            font-size: 14px;
            font-weight: 600;
            color: var(--text-secondary);
            border-radius: 999px;
            white-space: nowrap;
            border: 1px solid transparent;
            transition: all var(--transition-fast);
            flex-shrink: 0;
        }
        .nav-tab:hover {
            color: var(--text-primary);
            background-color: var(--bg-elevated);
        }
        .nav-tab--active {
            color: var(--accent-primary);
            background-color: var(--accent-primary-dim);
            border-color: rgba(232, 139, 42, 0.25);
        }
        .nav-tab--active:hover {
            color: var(--accent-primary);
            background-color: var(--accent-primary-dim);
        }
        @media (max-width: 767px) {
            .header-actions {
                gap: 8px;
            }
            .search-box {
                min-width: 140px;
                padding: 5px 10px;
            }
            .search-box input {
                font-size: 13px;
            }
            .logo {
                font-size: 17px;
            }
            .logo__icon {
                width: 32px;
                height: 32px;
                font-size: 12px;
            }
            .btn--sm {
                padding: 6px 14px;
                font-size: 13px;
            }
            .nav-tab {
                padding: 7px 13px;
                font-size: 13px;
            }
        }
        /* Page header */
        .page-head {
            background-color: var(--bg-tertiary);
            border-bottom: 1px solid var(--border-light);
            padding: var(--spacing-lg) 0;
            position: relative;
        }
        .page-head__breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--text-tertiary);
            margin-bottom: var(--spacing-sm);
            flex-wrap: wrap;
        }
        .page-head__breadcrumb a {
            color: var(--text-secondary);
        }
        .page-head__breadcrumb a:hover {
            color: var(--accent-primary-hover);
        }
        .page-head__breadcrumb .sep {
            color: var(--text-tertiary);
        }
        .page-head__title {
            font-size: 34px;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.3;
            margin-bottom: var(--spacing-sm);
        }
        .page-head__desc {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 820px;
            line-height: 1.8;
        }
        @media (max-width: 767px) {
            .page-head {
                padding: var(--spacing-md) 0;
            }
            .page-head__title {
                font-size: 25px;
            }
            .page-head__desc {
                font-size: 15px;
            }
        }
        /* Card grid */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--spacing-md);
        }
        .card-grid--2 {
            grid-template-columns: repeat(2, 1fr);
        }
        .card {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition-base);
            box-shadow: var(--shadow-low);
            display: flex;
            flex-direction: column;
        }
        .card:hover {
            border-color: var(--border-color-strong);
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .card__media {
            position: relative;
            aspect-ratio: 16 / 9;
            overflow: hidden;
            background-color: var(--bg-elevated);
        }
        .card__media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-base);
        }
        .card:hover .card__media img {
            transform: scale(1.03);
        }
        .card__body {
            padding: var(--spacing-md);
            display: flex;
            flex-direction: column;
            flex: 1;
        }
        .card__meta {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
            font-size: 13px;
            color: var(--text-tertiary);
            margin-bottom: var(--spacing-xs);
            flex-wrap: wrap;
        }
        .card__tag {
            display: inline-flex;
            padding: 3px 10px;
            font-size: 12px;
            font-weight: 600;
            border-radius: 999px;
            background-color: var(--accent-primary-dim);
            color: var(--accent-primary);
            border: 1px solid rgba(232, 139, 42, 0.2);
        }
        .card__tag--secondary {
            background-color: var(--accent-secondary-dim);
            color: var(--accent-secondary);
            border-color: rgba(184, 224, 230, 0.2);
        }
        .card__title {
            font-size: 18px;
            font-weight: 700;
            line-height: 1.45;
            color: var(--text-primary);
            margin-bottom: var(--spacing-xs);
            letter-spacing: -0.01em;
        }
        .card__title a {
            color: inherit;
        }
        .card__title a:hover {
            color: var(--accent-primary-hover);
        }
        .card__excerpt {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            flex: 1;
        }
        .card__footer {
            margin-top: var(--spacing-sm);
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 13px;
            color: var(--text-tertiary);
            padding-top: var(--spacing-sm);
            border-top: 1px solid var(--border-light);
        }
        .card__read-more {
            font-weight: 600;
            color: var(--accent-primary);
            font-size: 13px;
        }
        .card__read-more:hover {
            color: var(--accent-primary-hover);
        }
        @media (max-width: 1023px) {
            .card-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: var(--spacing-sm);
            }
        }
        @media (max-width: 767px) {
            .card-grid {
                grid-template-columns: 1fr;
            }
            .card-grid--2 {
                grid-template-columns: 1fr;
            }
            .card__title {
                font-size: 16px;
            }
        }
        /* Hot list */
        .hot-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: var(--spacing-md);
        }
        .hot-item {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: var(--spacing-md);
            transition: all var(--transition-base);
            box-shadow: var(--shadow-low);
            display: flex;
            gap: var(--spacing-sm);
            align-items: flex-start;
        }
        .hot-item:hover {
            border-color: var(--border-color-strong);
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .hot-item__rank {
            font-size: 28px;
            font-weight: 800;
            font-family: var(--font-mono);
            color: var(--accent-primary);
            line-height: 1;
            flex-shrink: 0;
            min-width: 38px;
        }
        .hot-item__rank--secondary {
            color: var(--accent-secondary);
        }
        .hot-item__body {
            flex: 1;
        }
        .hot-item__title {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.5;
            margin-bottom: 6px;
        }
        .hot-item__title a:hover {
            color: var(--accent-primary-hover);
        }
        .hot-item__desc {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        .hot-item__meta {
            font-size: 12px;
            color: var(--text-tertiary);
            margin-top: var(--spacing-xs);
        }
        @media (max-width: 767px) {
            .hot-list {
                grid-template-columns: 1fr;
                gap: var(--spacing-sm);
            }
            .hot-item__rank {
                font-size: 22px;
                min-width: 30px;
            }
            .hot-item__title {
                font-size: 15px;
            }
        }
        /* Tags */
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        .tag-pill {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: 999px;
            transition: all var(--transition-fast);
        }
        .tag-pill:hover {
            color: var(--accent-primary);
            border-color: var(--border-color-strong);
            background-color: var(--accent-primary-dim);
        }
        .tag-pill--active {
            color: var(--accent-primary);
            border-color: var(--border-color-strong);
            background-color: var(--accent-primary-dim);
        }
        /* Stats panel */
        .stats-panel {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-xl);
            padding: var(--spacing-lg);
            box-shadow: var(--shadow-md);
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--spacing-md);
        }
        .stat-item {
            text-align: center;
            padding: var(--spacing-sm);
            border-radius: var(--radius-md);
            background-color: var(--bg-tertiary);
            transition: all var(--transition-base);
        }
        .stat-item:hover {
            background-color: var(--bg-elevated);
            transform: translateY(-2px);
        }
        .stat-item__value {
            font-size: 36px;
            font-weight: 800;
            font-family: var(--font-mono);
            color: var(--accent-primary);
            line-height: 1.2;
            letter-spacing: -0.02em;
        }
        .stat-item__value--secondary {
            color: var(--accent-secondary);
        }
        .stat-item__label {
            font-size: 13px;
            color: var(--text-secondary);
            margin-top: var(--spacing-xs);
            font-weight: 500;
        }
        @media (max-width: 1023px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: var(--spacing-sm);
            }
            .stat-item__value {
                font-size: 28px;
            }
        }
        @media (max-width: 767px) {
            .stats-panel {
                padding: var(--spacing-md);
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: var(--spacing-xs);
            }
            .stat-item__value {
                font-size: 22px;
            }
            .stat-item__label {
                font-size: 12px;
            }
        }
        /* Scene cards */
        .scene-row {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--spacing-md);
        }
        .scene-card {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: var(--spacing-md);
            transition: all var(--transition-base);
            box-shadow: var(--shadow-low);
            display: flex;
            flex-direction: column;
            gap: var(--spacing-xs);
        }
        .scene-card:hover {
            border-color: var(--border-color-strong);
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .scene-card__icon {
            font-size: 28px;
            width: 48px;
            height: 48px;
            display: flex;
            align-items: center;
            justify-content: center;
            background-color: var(--accent-primary-dim);
            border-radius: var(--radius-md);
            color: var(--accent-primary);
            border: 1px solid rgba(232, 139, 42, 0.2);
            flex-shrink: 0;
        }
        .scene-card__title {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.45;
        }
        .scene-card__title a:hover {
            color: var(--accent-primary-hover);
        }
        .scene-card__desc {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        @media (max-width: 1023px) {
            .scene-row {
                grid-template-columns: repeat(2, 1fr);
                gap: var(--spacing-sm);
            }
        }
        @media (max-width: 767px) {
            .scene-row {
                grid-template-columns: 1fr;
            }
            .scene-card__title {
                font-size: 15px;
            }
        }
        /* Tip banner */
        .tip-banner {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-left: 4px solid var(--accent-primary);
            border-radius: var(--radius-md);
            padding: var(--spacing-md);
            display: flex;
            gap: var(--spacing-sm);
            align-items: flex-start;
            box-shadow: var(--shadow-low);
        }
        .tip-banner__icon {
            font-size: 22px;
            flex-shrink: 0;
            color: var(--accent-primary);
        }
        .tip-banner__title {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 4px;
        }
        .tip-banner__text {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        /* Subscribe */
        .subscribe-box {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-xl);
            padding: var(--spacing-lg);
            box-shadow: var(--shadow-md);
            display: flex;
            gap: var(--spacing-lg);
            align-items: center;
            flex-wrap: wrap;
            position: relative;
            overflow: hidden;
        }
        .subscribe-box::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
        }
        .subscribe-box__content {
            flex: 1;
            min-width: 280px;
        }
        .subscribe-box__title {
            font-size: 22px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: var(--spacing-xs);
        }
        .subscribe-box__desc {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        .subscribe-box__form {
            display: flex;
            gap: var(--spacing-sm);
            flex-shrink: 0;
            align-items: center;
            flex-wrap: wrap;
        }
        .subscribe-box__form input {
            min-width: 220px;
            max-width: 300px;
            border-radius: 999px;
            padding: 11px 20px;
            background-color: var(--bg-tertiary);
            border-color: var(--border-light);
        }
        .subscribe-box__form input:focus {
            border-color: var(--accent-primary);
        }
        @media (max-width: 767px) {
            .subscribe-box {
                padding: var(--spacing-md);
                gap: var(--spacing-md);
            }
            .subscribe-box__title {
                font-size: 19px;
            }
            .subscribe-box__form {
                width: 100%;
            }
            .subscribe-box__form input {
                min-width: 100%;
                max-width: 100%;
            }
            .subscribe-box__form .btn {
                width: 100%;
            }
        }
        /* FAQ */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: var(--spacing-sm);
            max-width: 860px;
        }
        .faq-item {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition-fast);
        }
        .faq-item:hover {
            border-color: var(--border-color-strong);
        }
        .faq-item__question {
            padding: var(--spacing-md);
            font-size: 16px;
            font-weight: 700;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--spacing-sm);
            cursor: pointer;
            user-select: none;
        }
        .faq-item__question:hover {
            color: var(--accent-primary-hover);
        }
        .faq-item__icon {
            font-size: 20px;
            color: var(--accent-primary);
            flex-shrink: 0;
            transition: transform var(--transition-base);
        }
        .faq-item__answer {
            padding: 0 var(--spacing-md) var(--spacing-md) var(--spacing-md);
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
            display: none;
        }
        .faq-item--open .faq-item__answer {
            display: block;
        }
        .faq-item--open .faq-item__icon {
            transform: rotate(180deg);
        }
        .faq-item--open {
            border-color: var(--border-color-strong);
        }
        @media (max-width: 767px) {
            .faq-item__question {
                font-size: 15px;
                padding: var(--spacing-sm);
            }
            .faq-item__answer {
                font-size: 14px;
                padding: 0 var(--spacing-sm) var(--spacing-sm) var(--spacing-sm);
            }
        }
        /* Footer */
        .site-footer {
            background-color: var(--bg-tertiary);
            border-top: 1px solid var(--border-light);
            padding: var(--spacing-lg) 0 var(--spacing-md) 0;
            margin-top: 0;
        }
        .footer-main {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: var(--spacing-lg);
            margin-bottom: var(--spacing-lg);
        }
        .footer-brand__text {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-top: var(--spacing-sm);
            max-width: 340px;
        }
        .footer-col__title {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: var(--spacing-sm);
        }
        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .footer-links a {
            font-size: 14px;
            color: var(--text-secondary);
            transition: color var(--transition-fast);
        }
        .footer-links a:hover {
            color: var(--accent-primary-hover);
        }
        .footer-bottom {
            border-top: 1px solid var(--border-light);
            padding-top: var(--spacing-md);
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: var(--spacing-sm);
        }
        .footer-legal {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
            flex-wrap: wrap;
            font-size: 12px;
            color: var(--text-tertiary);
        }
        .footer-legal a {
            color: var(--text-tertiary);
        }
        .footer-legal a:hover {
            color: var(--accent-primary-hover);
        }
        @media (max-width: 1023px) {
            .footer-main {
                grid-template-columns: 1fr 1fr;
                gap: var(--spacing-md);
            }
        }
        @media (max-width: 767px) {
            .footer-main {
                grid-template-columns: 1fr;
                gap: var(--spacing-md);
            }
            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: var(--spacing-xs);
            }
        }
        /* Utility */
        .text-center {
            text-align: center;
        }
        .mt-sm {
            margin-top: var(--spacing-sm);
        }
        .mt-md {
            margin-top: var(--spacing-md);
        }
        .mt-lg {
            margin-top: var(--spacing-lg);
        }
        .link-more {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            font-weight: 600;
            color: var(--accent-primary);
            transition: all var(--transition-fast);
        }
        .link-more:hover {
            color: var(--accent-primary-hover);
            gap: 10px;
        }
        .divider {
            border: none;
            border-top: 1px solid var(--border-light);
            margin: var(--spacing-md) 0;
        }

/* roulang page: category5 */
:root {
            --bg-primary: #12161C;
            --bg-secondary: #1A2028;
            --bg-tertiary: #0E1216;
            --bg-elevated: #202A35;
            --accent-primary: #E88B2A;
            --accent-primary-hover: #F0A13C;
            --accent-primary-dim: rgba(232, 139, 42, 0.15);
            --accent-secondary: #B8E0E6;
            --accent-secondary-dim: rgba(184, 224, 230, 0.12);
            --text-primary: #ECE9E4;
            --text-secondary: #AAB2B8;
            --text-tertiary: #6E7A82;
            --border-color: rgba(240, 161, 60, 0.18);
            --border-color-strong: rgba(240, 161, 60, 0.35);
            --border-light: rgba(255, 255, 255, 0.08);
            --radius-sm: 10px;
            --radius-md: 14px;
            --radius-lg: 18px;
            --radius-xl: 24px;
            --shadow-low: 0 4px 16px rgba(0, 0, 0, 0.2);
            --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.25);
            --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.35);
            --shadow-accent: 0 8px 28px rgba(232, 139, 42, 0.18);
            --spacing-xs: 8px;
            --spacing-sm: 16px;
            --spacing-md: 24px;
            --spacing-lg: 40px;
            --spacing-xl: 64px;
            --spacing-xxl: 96px;
            --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Helvetica Neue', system-ui, sans-serif;
            --font-mono: 'JetBrains Mono', 'SF Mono', 'Courier New', Consolas, monospace;
            --transition-fast: 0.2s ease;
            --transition-base: 0.3s ease;
            --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
            --container-max: 1200px;
        }
        :root {
            --spacing-xl: 48px;
            --spacing-xxl: 72px;
        }
        :root {
            --spacing-xl: 40px;
            --spacing-xxl: 56px;
            --spacing-lg: 28px;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            font-size: 16px;
        }
        body {
            font-family: var(--font-body);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.7;
            font-size: 16px;
            overflow-x: hidden;
            margin: 0;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition-fast);
        }
        a:hover {
            color: var(--accent-primary-hover);
        }
        a:focus-visible {
            outline: 2px solid var(--accent-primary);
            outline-offset: 3px;
            border-radius: 4px;
        }
        button {
            font-family: var(--font-body);
            cursor: pointer;
            border: none;
            background: none;
            font-size: inherit;
            color: inherit;
            transition: all var(--transition-base);
        }
        button:focus-visible {
            outline: 2px solid var(--accent-primary);
            outline-offset: 3px;
        }
        input,
        select,
        textarea {
            font-family: var(--font-body);
            font-size: 16px;
            color: var(--text-primary);
            background-color: var(--bg-secondary);
            border: 1px solid rgba(255, 255, 255, 0.12);
            border-radius: var(--radius-sm);
            padding: 10px 14px;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
            width: 100%;
        }
        input::placeholder,
        textarea::placeholder {
            color: var(--text-tertiary);
        }
        input:focus,
        select:focus,
        textarea:focus {
            outline: none;
            border-color: var(--accent-primary);
            box-shadow: 0 0 0 3px rgba(232, 139, 42, 0.15);
        }
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 var(--spacing-md);
            width: 100%;
        }
        .section {
            padding: var(--spacing-xl) 0;
            position: relative;
        }
        .section--alt {
            background-color: var(--bg-secondary);
        }
        .section--tertiary {
            background-color: var(--bg-tertiary);
        }
        .section--compact {
            padding: var(--spacing-lg) 0;
        }
        .section-header {
            margin-bottom: var(--spacing-lg);
            max-width: 760px;
        }
        .section-header--center {
            margin-left: auto;
            margin-right: auto;
            text-align: center;
        }
        .section-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 1.5px;
            text-transform: uppercase;
            color: var(--accent-primary);
            background-color: var(--accent-primary-dim);
            padding: 6px 16px;
            border-radius: 999px;
            margin-bottom: var(--spacing-sm);
            border: 1px solid rgba(232, 139, 42, 0.2);
        }
        .section-tag--secondary {
            color: var(--accent-secondary);
            background-color: var(--accent-secondary-dim);
            border-color: rgba(184, 224, 230, 0.2);
        }
        .section-title {
            font-size: clamp(26px, 3.5vw, 38px);
            font-weight: 800;
            line-height: 1.3;
            color: var(--text-primary);
            margin: 0 0 var(--spacing-sm);
            letter-spacing: 0.02em;
        }
        .section-subtitle {
            font-size: 16px;
            color: var(--text-secondary);
            margin: 0;
            line-height: 1.8;
        }
        .grid {
            display: grid;
            gap: var(--spacing-md);
        }
        .grid--2 {
            grid-template-columns: repeat(2, 1fr);
        }
        .grid--3 {
            grid-template-columns: repeat(3, 1fr);
        }
        .grid--4 {
            grid-template-columns: repeat(4, 1fr);
        }
        .card {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: var(--spacing-md);
            box-shadow: var(--shadow-low);
            transition: border-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base);
            position: relative;
            overflow: hidden;
        }
        .card:hover {
            border-color: var(--border-color-strong);
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
        }
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 12px;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 999px;
            background-color: var(--accent-primary-dim);
            color: var(--accent-primary);
            border: 1px solid rgba(232, 139, 42, 0.25);
            white-space: nowrap;
        }
        .badge--secondary {
            background-color: var(--accent-secondary-dim);
            color: var(--accent-secondary);
            border-color: rgba(184, 224, 230, 0.25);
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 15px;
            letter-spacing: 0.03em;
            transition: all var(--transition-base);
            text-decoration: none;
            cursor: pointer;
            border: 1px solid transparent;
            white-space: nowrap;
        }
        .btn--primary {
            background-color: var(--accent-primary);
            color: #0E1216;
            box-shadow: 0 4px 16px rgba(232, 139, 42, 0.25);
        }
        .btn--primary:hover {
            background-color: var(--accent-primary-hover);
            box-shadow: var(--shadow-accent);
            transform: translateY(-2px);
            color: #0E1216;
        }
        .btn--primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(232, 139, 42, 0.2);
        }
        .btn--ghost {
            background-color: transparent;
            color: var(--text-primary);
            border-color: var(--border-color-strong);
        }
        .btn--ghost:hover {
            background-color: var(--accent-primary-dim);
            border-color: var(--accent-primary);
            color: var(--accent-primary-hover);
        }
        .btn--sm {
            padding: 8px 16px;
            font-size: 13px;
            border-radius: var(--radius-sm);
        }
        .btn--lg {
            padding: 14px 32px;
            font-size: 16px;
            border-radius: var(--radius-lg);
        }
        .icon {
            width: 18px;
            height: 18px;
            flex-shrink: 0;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }
        .site-header {
            background-color: rgba(18, 22, 28, 0.92);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-light);
            position: sticky;
            top: 0;
            z-index: 100;
            padding: 12px 0 0;
        }
        .header-top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--spacing-md);
            padding-bottom: 12px;
        }
        .logo {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 20px;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: 0.03em;
            white-space: nowrap;
        }
        .logo:hover {
            color: var(--accent-primary-hover);
        }
        .logo__icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--accent-primary), #C4701E);
            color: #0E1216;
            font-weight: 800;
            font-size: 16px;
            font-family: var(--font-mono);
            letter-spacing: -0.03em;
        }
        .header-actions {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
        }
        .search-box {
            display: flex;
            align-items: center;
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: 999px;
            padding: 6px 14px;
            gap: 8px;
            min-width: 260px;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
        }
        .search-box:focus-within {
            border-color: var(--accent-primary);
            box-shadow: 0 0 0 3px rgba(232, 139, 42, 0.12);
        }
        .search-box__icon {
            font-size: 14px;
            flex-shrink: 0;
        }
        .search-box input {
            border: none;
            background: transparent;
            padding: 4px 0;
            font-size: 13px;
            width: 100%;
            box-shadow: none;
            color: var(--text-primary);
        }
        .search-box input:focus {
            box-shadow: none;
            border: none;
        }
        .header-nav {
            display: flex;
            gap: 6px;
            overflow-x: auto;
            padding-bottom: 10px;
            scrollbar-width: thin;
            scrollbar-color: var(--accent-primary) transparent;
            -webkit-overflow-scrolling: touch;
        }
        .header-nav::-webkit-scrollbar {
            height: 3px;
        }
        .header-nav::-webkit-scrollbar-thumb {
            background-color: var(--accent-primary);
            border-radius: 999px;
        }
        .nav-tab {
            flex-shrink: 0;
            padding: 8px 18px;
            border-radius: 999px;
            font-size: 14px;
            font-weight: 600;
            color: var(--text-secondary);
            border: 1px solid transparent;
            transition: all var(--transition-fast);
            white-space: nowrap;
            position: relative;
        }
        .nav-tab:hover {
            color: var(--text-primary);
            background-color: var(--bg-elevated);
            border-color: var(--border-light);
        }
        .nav-tab--active {
            color: var(--accent-primary);
            background-color: var(--accent-primary-dim);
            border-color: rgba(232, 139, 42, 0.3);
            box-shadow: 0 2px 8px rgba(232, 139, 42, 0.1);
        }
        .nav-tab--active::after {
            content: '';
            position: absolute;
            left: 18px;
            right: 18px;
            bottom: 4px;
            height: 2px;
            background-color: var(--accent-primary);
            border-radius: 999px;
        }
        .site-footer {
            background-color: var(--bg-tertiary);
            border-top: 1px solid var(--border-light);
            padding: var(--spacing-xl) 0 var(--spacing-md);
        }
        .footer-main {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: var(--spacing-lg);
            margin-bottom: var(--spacing-lg);
        }
        .footer-brand__text {
            font-size: 14px;
            color: var(--text-secondary);
            margin: var(--spacing-sm) 0 0;
            max-width: 360px;
            line-height: 1.8;
        }
        .footer-col__title {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: var(--spacing-sm);
            letter-spacing: 0.02em;
        }
        .footer-links {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-links a {
            color: var(--text-tertiary);
            font-size: 14px;
            transition: color var(--transition-fast);
        }
        .footer-links a:hover {
            color: var(--accent-primary-hover);
        }
        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: var(--spacing-sm);
            padding-top: var(--spacing-md);
            border-top: 1px solid var(--border-light);
        }
        .footer-legal {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 13px;
            color: var(--text-tertiary);
        }
        .footer-legal a {
            color: var(--text-tertiary);
            font-size: 13px;
        }
        .footer-legal a:hover {
            color: var(--accent-primary-hover);
        }
        .page-hero {
            padding: 40px 0 28px;
            background:
                radial-gradient(ellipse at 30% 20%, rgba(232, 139, 42, 0.08), transparent 50%),
                radial-gradient(ellipse at 70% 80%, rgba(184, 224, 230, 0.05), transparent 45%),
                var(--bg-tertiary);
            border-bottom: 1px solid var(--border-light);
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 13px;
            color: var(--text-tertiary);
            margin-bottom: var(--spacing-md);
        }
        .breadcrumb a {
            color: var(--text-tertiary);
            transition: color var(--transition-fast);
        }
        .breadcrumb a:hover {
            color: var(--accent-primary-hover);
        }
        .breadcrumb span {
            color: var(--text-tertiary);
        }
        .page-hero__title-row {
            display: flex;
            align-items: flex-start;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: var(--spacing-md);
        }
        .page-hero__meta {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
            flex-wrap: wrap;
        }
        .page-hero__description {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 720px;
            line-height: 1.8;
            margin-top: var(--spacing-sm);
        }
        .filter-bar {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
            margin-top: var(--spacing-md);
        }
        .filter-chip {
            padding: 6px 16px;
            border-radius: 999px;
            font-size: 13px;
            font-weight: 600;
            color: var(--text-secondary);
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            cursor: pointer;
            transition: all var(--transition-fast);
            white-space: nowrap;
        }
        .filter-chip:hover {
            border-color: var(--border-color-strong);
            color: var(--text-primary);
        }
        .filter-chip--active {
            background-color: var(--accent-primary-dim);
            color: var(--accent-primary);
            border-color: rgba(232, 139, 42, 0.3);
        }
        .version-card {
            display: flex;
            flex-direction: column;
            gap: var(--spacing-sm);
            padding: var(--spacing-md);
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-low);
            transition: all var(--transition-base);
            position: relative;
        }
        .version-card:hover {
            border-color: var(--border-color-strong);
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
        }
        .version-card__top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--spacing-sm);
            flex-wrap: wrap;
        }
        .version-card__version {
            font-family: var(--font-mono);
            font-size: 18px;
            font-weight: 700;
            color: var(--accent-primary);
            letter-spacing: -0.02em;
        }
        .version-card__date {
            font-size: 13px;
            color: var(--text-tertiary);
            font-family: var(--font-mono);
        }
        .version-card__title {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.5;
        }
        .version-card__desc {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin: 0;
        }
        .version-card__tags {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
        }
        .version-card__footer {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--spacing-sm);
            padding-top: var(--spacing-xs);
            border-top: 1px solid var(--border-light);
            flex-wrap: wrap;
        }
        .version-card__link {
            font-size: 13px;
            font-weight: 600;
            color: var(--accent-primary);
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .version-card__link:hover {
            color: var(--accent-primary-hover);
        }
        .timeline {
            position: relative;
            padding-left: 28px;
            display: flex;
            flex-direction: column;
            gap: var(--spacing-md);
        }
        .timeline::before {
            content: '';
            position: absolute;
            left: 10px;
            top: 6px;
            bottom: 6px;
            width: 2px;
            background: linear-gradient(to bottom, var(--accent-primary), rgba(232, 139, 42, 0.1));
            border-radius: 999px;
        }
        .timeline-item {
            position: relative;
            padding-left: 0;
        }
        .timeline-item::before {
            content: '';
            position: absolute;
            left: -24px;
            top: 8px;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background-color: var(--accent-primary);
            box-shadow: 0 0 0 4px rgba(232, 139, 42, 0.2);
        }
        .timeline-item__version {
            font-family: var(--font-mono);
            font-size: 15px;
            font-weight: 700;
            color: var(--accent-primary);
        }
        .timeline-item__title {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            margin: 4px 0;
        }
        .timeline-item__desc {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin: 0;
        }
        .feature-highlight {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--spacing-md);
            align-items: center;
            padding: var(--spacing-md);
            background-color: var(--bg-tertiary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow-low);
        }
        .feature-highlight__img {
            border-radius: var(--radius-lg);
            overflow: hidden;
            min-height: 240px;
            aspect-ratio: 16/10;
            object-fit: cover;
            border: 1px solid var(--border-light);
        }
        .feature-highlight__content {
            padding: var(--spacing-sm);
        }
        .feature-highlight__title {
            font-size: 22px;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: var(--spacing-sm);
            line-height: 1.4;
        }
        .feature-highlight__desc {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: var(--spacing-sm);
        }
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            align-items: center;
        }
        .tag-cloud__item {
            padding: 8px 18px;
            border-radius: 999px;
            font-size: 14px;
            font-weight: 600;
            color: var(--text-secondary);
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            transition: all var(--transition-fast);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .tag-cloud__item:hover {
            border-color: var(--accent-primary);
            color: var(--accent-primary);
            background-color: var(--accent-primary-dim);
        }
        .tag-cloud__item--active {
            background-color: var(--accent-primary-dim);
            color: var(--accent-primary);
            border-color: rgba(232, 139, 42, 0.3);
        }
        .subscribe-box {
            background: linear-gradient(135deg, rgba(232, 139, 42, 0.1), rgba(184, 224, 230, 0.06));
            border: 1px solid var(--border-color-strong);
            border-radius: var(--radius-xl);
            padding: var(--spacing-lg);
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--spacing-md);
            flex-wrap: wrap;
        }
        .subscribe-box__text h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0 0 6px;
        }
        .subscribe-box__text p {
            font-size: 14px;
            color: var(--text-secondary);
            margin: 0;
        }
        .subscribe-form {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            min-width: 280px;
            flex: 1;
            max-width: 420px;
        }
        .subscribe-form input {
            flex: 1;
            min-width: 180px;
        }
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: var(--spacing-sm);
        }
        .faq-item {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: var(--spacing-md);
            transition: border-color var(--transition-fast);
        }
        .faq-item:hover {
            border-color: var(--border-color-strong);
        }
        .faq-item__q {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0 0 6px;
            display: flex;
            align-items: flex-start;
            gap: 8px;
        }
        .faq-item__q::before {
            content: 'Q';
            font-family: var(--font-mono);
            font-weight: 700;
            color: var(--accent-primary);
            flex-shrink: 0;
        }
        .faq-item__a {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin: 0;
            padding-left: 26px;
        }
        .faq-item__a::before {
            content: 'A';
            font-family: var(--font-mono);
            font-weight: 700;
            color: var(--accent-secondary);
            margin-right: 8px;
        }
        .cta-band {
            background:
                radial-gradient(ellipse at 20% 30%, rgba(232, 139, 42, 0.15), transparent 50%),
                radial-gradient(ellipse at 80% 70%, rgba(184, 224, 230, 0.08), transparent 45%),
                var(--bg-secondary);
            border: 1px solid var(--border-color-strong);
            border-radius: var(--radius-xl);
            padding: var(--spacing-xl) var(--spacing-lg);
            text-align: center;
            box-shadow: var(--shadow-lg);
        }
        .cta-band__title {
            font-size: 28px;
            font-weight: 800;
            color: var(--text-primary);
            margin: 0 0 var(--spacing-sm);
            line-height: 1.4;
        }
        .cta-band__desc {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto var(--spacing-md);
            line-height: 1.8;
        }
        .cta-band__actions {
            display: flex;
            gap: var(--spacing-sm);
            justify-content: center;
            flex-wrap: wrap;
        }
        .stat-strip {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--spacing-md);
        }
        .stat-strip__item {
            text-align: center;
            padding: var(--spacing-md);
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-low);
            transition: all var(--transition-base);
        }
        .stat-strip__item:hover {
            border-color: var(--border-color-strong);
            box-shadow: var(--shadow-md);
        }
        .stat-strip__num {
            font-family: var(--font-mono);
            font-size: 32px;
            font-weight: 800;
            color: var(--accent-primary);
            display: block;
            letter-spacing: -0.02em;
        }
        .stat-strip__label {
            font-size: 14px;
            color: var(--text-secondary);
            margin-top: 6px;
        }
        @media (max-width: 1024px) {
            .grid--4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .stat-strip {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-main {
                grid-template-columns: 1fr 1fr;
            }
            .feature-highlight {
                grid-template-columns: 1fr;
            }
            .feature-highlight__img {
                min-height: 200px;
                aspect-ratio: 16/9;
            }
        }
        @media (max-width: 768px) {
            .section {
                padding: var(--spacing-lg) 0;
            }
            .grid--2,
            .grid--3,
            .grid--4 {
                grid-template-columns: 1fr;
            }
            .stat-strip {
                grid-template-columns: 1fr 1fr;
                gap: var(--spacing-sm);
            }
            .stat-strip__num {
                font-size: 24px;
            }
            .header-top {
                flex-direction: column;
                align-items: stretch;
                gap: 10px;
            }
            .header-actions {
                justify-content: space-between;
            }
            .search-box {
                min-width: 0;
                flex: 1;
            }
            .footer-main {
                grid-template-columns: 1fr;
                gap: var(--spacing-md);
            }
            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: var(--spacing-sm);
            }
            .subscribe-box {
                flex-direction: column;
                align-items: stretch;
                text-align: center;
            }
            .subscribe-form {
                max-width: none;
            }
            .page-hero__title-row {
                flex-direction: column;
                align-items: flex-start;
            }
            .cta-band {
                padding: var(--spacing-lg) var(--spacing-md);
            }
            .cta-band__title {
                font-size: 22px;
            }
            .feature-highlight {
                padding: var(--spacing-sm);
            }
            .feature-highlight__title {
                font-size: 18px;
            }
        }
        @media (max-width: 520px) {
            .stat-strip {
                grid-template-columns: 1fr;
            }
            .version-card__footer {
                flex-direction: column;
                align-items: flex-start;
            }
            .filter-bar {
                flex-wrap: nowrap;
                overflow-x: auto;
                padding-bottom: 4px;
            }
        }

/* roulang page: category6 */
:root {
            --bg-primary: #12161C;
            --bg-secondary: #1A2028;
            --bg-tertiary: #0E1216;
            --bg-elevated: #202A35;
            --accent-primary: #E88B2A;
            --accent-primary-hover: #F0A13C;
            --accent-primary-dim: rgba(232, 139, 42, 0.15);
            --accent-secondary: #B8E0E6;
            --accent-secondary-dim: rgba(184, 224, 230, 0.12);
            --text-primary: #ECE9E4;
            --text-secondary: #AAB2B8;
            --text-tertiary: #6E7A82;
            --border-color: rgba(240, 161, 60, 0.18);
            --border-color-strong: rgba(240, 161, 60, 0.35);
            --border-light: rgba(255, 255, 255, 0.08);
            --radius-sm: 10px;
            --radius-md: 14px;
            --radius-lg: 18px;
            --radius-xl: 24px;
            --shadow-low: 0 4px 16px rgba(0, 0, 0, 0.2);
            --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.25);
            --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.35);
            --shadow-accent: 0 8px 28px rgba(232, 139, 42, 0.18);
            --spacing-xs: 8px;
            --spacing-sm: 16px;
            --spacing-md: 24px;
            --spacing-lg: 40px;
            --spacing-xl: 48px;
            --spacing-xxl: 72px;
            --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Helvetica Neue', system-ui, sans-serif;
            --font-mono: 'JetBrains Mono', 'SF Mono', 'Courier New', Consolas, monospace;
            --transition-fast: 0.2s ease;
            --transition-base: 0.3s ease;
            --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
            --container-max: 1200px;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            font-size: 16px;
        }

        body {
            font-family: var(--font-body);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.7;
            font-size: 16px;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition-fast);
        }

        a:hover {
            color: var(--accent-primary-hover);
        }

        a:focus-visible {
            outline: 2px solid var(--accent-primary);
            outline-offset: 3px;
            border-radius: 4px;
        }

        button {
            font-family: var(--font-body);
            cursor: pointer;
            border: none;
            background: none;
            font-size: inherit;
            color: inherit;
            transition: all var(--transition-base);
        }

        button:focus-visible {
            outline: 2px solid var(--accent-primary);
            outline-offset: 3px;
        }

        input,
        select,
        textarea {
            font-family: var(--font-body);
            font-size: 16px;
            color: var(--text-primary);
            background-color: var(--bg-secondary);
            border: 1px solid rgba(255, 255, 255, 0.12);
            border-radius: var(--radius-sm);
            padding: 10px 14px;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
            width: 100%;
        }

        input::placeholder,
        textarea::placeholder {
            color: var(--text-tertiary);
        }

        input:focus,
        select:focus,
        textarea:focus {
            outline: none;
            border-color: var(--accent-primary);
            box-shadow: 0 0 0 3px rgba(232, 139, 42, 0.15);
        }

        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 var(--spacing-md);
            width: 100%;
        }

        .section {
            padding: var(--spacing-xl) 0;
            position: relative;
        }

        .section--alt {
            background-color: var(--bg-secondary);
        }

        .section--tertiary {
            background-color: var(--bg-tertiary);
        }

        .section--compact {
            padding: var(--spacing-lg) 0;
        }

        .section-header {
            margin-bottom: var(--spacing-lg);
            max-width: 760px;
        }

        .section-header--center {
            margin-left: auto;
            margin-right: auto;
            text-align: center;
        }

        .section-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 1.5px;
            text-transform: uppercase;
            color: var(--accent-primary);
            background-color: var(--accent-primary-dim);
            padding: 6px 16px;
            border-radius: 999px;
            margin-bottom: var(--spacing-sm);
            border: 1px solid rgba(232, 139, 42, 0.2);
        }

        .section-tag--secondary {
            color: var(--accent-secondary);
            background-color: var(--accent-secondary-dim);
            border-color: rgba(184, 224, 230, 0.2);
        }

        .section-title {
            font-size: clamp(1.75rem, 3vw, 2.5rem);
            font-weight: 800;
            line-height: 1.3;
            color: var(--text-primary);
            margin-bottom: var(--spacing-sm);
            letter-spacing: -0.01em;
        }

        .section-desc {
            font-size: 17px;
            color: var(--text-secondary);
            line-height: 1.8;
            max-width: 680px;
        }

        .section-header--center .section-desc {
            margin-left: auto;
            margin-right: auto;
        }

        /* Header */
        .site-header {
            background-color: var(--bg-tertiary);
            border-bottom: 1px solid var(--border-light);
            position: sticky;
            top: 0;
            z-index: 100;
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            background-color: rgba(14, 18, 22, 0.92);
        }

        .header-top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: var(--spacing-sm) 0;
            gap: var(--spacing-md);
        }

        .logo {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 20px;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: 0.02em;
            white-space: nowrap;
            transition: color var(--transition-fast);
        }

        .logo:hover {
            color: var(--accent-primary-hover);
        }

        .logo__icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            background: linear-gradient(135deg, var(--accent-primary) 0%, #c96f1a 100%);
            color: #0E1216;
            font-size: 14px;
            font-weight: 900;
            border-radius: 10px;
            letter-spacing: -0.02em;
            flex-shrink: 0;
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
        }

        .search-box {
            display: flex;
            align-items: center;
            gap: 8px;
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-sm);
            padding: 0 12px;
            height: 40px;
            min-width: 220px;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
        }

        .search-box:focus-within {
            border-color: var(--accent-primary);
            box-shadow: 0 0 0 3px rgba(232, 139, 42, 0.12);
        }

        .search-box__icon {
            font-size: 14px;
            color: var(--text-tertiary);
            flex-shrink: 0;
        }

        .search-box input {
            border: none;
            background: none;
            padding: 0;
            height: 100%;
            font-size: 14px;
            width: 100%;
            box-shadow: none;
        }

        .search-box input:focus {
            box-shadow: none;
            border-color: transparent;
        }

        .search-box input::placeholder {
            color: var(--text-tertiary);
            font-size: 13px;
        }

        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-weight: 700;
            font-size: 15px;
            border-radius: var(--radius-sm);
            padding: 12px 24px;
            transition: all var(--transition-base);
            white-space: nowrap;
            letter-spacing: 0.01em;
        }

        .btn--primary {
            background-color: var(--accent-primary);
            color: #0E1216;
            border: 1px solid var(--accent-primary);
            box-shadow: var(--shadow-accent);
        }

        .btn--primary:hover {
            background-color: var(--accent-primary-hover);
            border-color: var(--accent-primary-hover);
            box-shadow: 0 12px 32px rgba(232, 139, 42, 0.28);
            color: #0E1216;
            transform: translateY(-1px);
        }

        .btn--primary:active {
            transform: translateY(0);
            box-shadow: var(--shadow-accent);
        }

        .btn--sm {
            padding: 8px 16px;
            font-size: 14px;
            height: 40px;
            border-radius: 8px;
        }

        .btn--ghost {
            background-color: transparent;
            color: var(--accent-secondary);
            border: 1px solid var(--border-color-strong);
            box-shadow: none;
        }

        .btn--ghost:hover {
            background-color: var(--accent-secondary-dim);
            border-color: var(--accent-secondary);
            color: var(--accent-secondary);
            transform: translateY(-1px);
        }

        .btn--ghost:active {
            transform: translateY(0);
        }

        /* Navigation */
        .header-nav {
            display: flex;
            align-items: center;
            gap: 4px;
            padding-bottom: var(--spacing-sm);
            overflow-x: auto;
            scrollbar-width: none;
            -ms-overflow-style: none;
            border-top: 1px solid var(--border-light);
            padding-top: var(--spacing-xs);
        }

        .header-nav::-webkit-scrollbar {
            display: none;
        }

        .nav-tab {
            display: inline-flex;
            align-items: center;
            padding: 8px 18px;
            font-size: 14px;
            font-weight: 600;
            color: var(--text-secondary);
            border-radius: 999px;
            white-space: nowrap;
            position: relative;
            transition: all var(--transition-fast);
            letter-spacing: 0.02em;
        }

        .nav-tab:hover {
            color: var(--text-primary);
            background-color: var(--bg-elevated);
        }

        .nav-tab--active {
            color: var(--accent-primary);
            background-color: var(--accent-primary-dim);
            font-weight: 700;
        }

        .nav-tab--active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 24px;
            height: 3px;
            background-color: var(--accent-primary);
            border-radius: 3px;
        }

        /* Footer */
        .site-footer {
            background-color: var(--bg-tertiary);
            border-top: 1px solid var(--border-light);
            padding: var(--spacing-xl) 0 var(--spacing-md);
            margin-top: var(--spacing-xl);
        }

        .footer-main {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: var(--spacing-lg);
            margin-bottom: var(--spacing-lg);
        }

        .footer-brand__text {
            font-size: 14px;
            color: var(--text-tertiary);
            line-height: 1.7;
            margin-top: var(--spacing-sm);
            max-width: 340px;
        }

        .footer-col__title {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: var(--spacing-sm);
        }

        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .footer-links a {
            font-size: 14px;
            color: var(--text-tertiary);
            transition: color var(--transition-fast);
        }

        .footer-links a:hover {
            color: var(--accent-primary-hover);
        }

        .footer-bottom {
            border-top: 1px solid var(--border-light);
            padding-top: var(--spacing-md);
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: var(--spacing-sm);
        }

        .footer-legal {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
            flex-wrap: wrap;
            font-size: 13px;
            color: var(--text-tertiary);
        }

        .footer-legal a {
            color: var(--text-tertiary);
            transition: color var(--transition-fast);
        }

        .footer-legal a:hover {
            color: var(--accent-primary-hover);
        }

        /* Page-specific: Cases Reviews */
        .page-hero {
            background: linear-gradient(180deg, var(--bg-tertiary) 0%, var(--bg-primary) 100%);
            padding: var(--spacing-xl) 0 var(--spacing-lg);
            position: relative;
            overflow: hidden;
        }

        .page-hero::before {
            content: '';
            position: absolute;
            top: -60%;
            right: -20%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(232, 139, 42, 0.08) 0%, transparent 70%);
            pointer-events: none;
        }

        .page-hero h1 {
            font-size: clamp(2rem, 4vw, 3rem);
            font-weight: 800;
            line-height: 1.25;
            color: var(--text-primary);
            margin-bottom: var(--spacing-sm);
            letter-spacing: -0.015em;
            position: relative;
            z-index: 1;
        }

        .page-hero .lead {
            font-size: 17px;
            color: var(--text-secondary);
            max-width: 700px;
            line-height: 1.8;
            position: relative;
            z-index: 1;
        }

        .case-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--spacing-md);
        }

        .case-card {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 0;
            overflow: hidden;
            transition: all var(--transition-base);
            display: flex;
            flex-direction: column;
        }

        .case-card:hover {
            border-color: var(--border-color-strong);
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
        }

        .case-card__img {
            aspect-ratio: 16/9;
            overflow: hidden;
            background-color: var(--bg-elevated);
            position: relative;
        }

        .case-card__img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-slow);
        }

        .case-card:hover .case-card__img img {
            transform: scale(1.03);
        }

        .case-card__body {
            padding: var(--spacing-md);
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .case-card__badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 12px;
            font-weight: 700;
            color: var(--accent-secondary);
            background-color: var(--accent-secondary-dim);
            border: 1px solid rgba(184, 224, 230, 0.2);
            padding: 4px 12px;
            border-radius: 999px;
            margin-bottom: var(--spacing-xs);
            align-self: flex-start;
        }

        .case-card__badge--amber {
            color: var(--accent-primary);
            background-color: var(--accent-primary-dim);
            border-color: rgba(232, 139, 42, 0.2);
        }

        .case-card__title {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.45;
            margin-bottom: var(--spacing-xs);
            letter-spacing: -0.005em;
        }

        .case-card__excerpt {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: var(--spacing-sm);
            flex: 1;
        }

        .case-card__meta {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
            font-size: 12px;
            color: var(--text-tertiary);
            padding-top: var(--spacing-xs);
            border-top: 1px solid var(--border-light);
        }

        .case-card__meta span {
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        .featured-case {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--spacing-lg);
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color-strong);
            border-radius: var(--radius-xl);
            padding: var(--spacing-lg);
            align-items: center;
            position: relative;
            overflow: hidden;
        }

        .featured-case::before {
            content: '';
            position: absolute;
            top: -40%;
            left: -10%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(184, 224, 230, 0.06) 0%, transparent 70%);
            pointer-events: none;
        }

        .featured-case__img {
            border-radius: var(--radius-lg);
            overflow: hidden;
            aspect-ratio: 4/3;
            background-color: var(--bg-elevated);
        }

        .featured-case__img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .featured-case__title {
            font-size: 24px;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: var(--spacing-sm);
            line-height: 1.35;
        }

        .featured-case__desc {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.75;
            margin-bottom: var(--spacing-sm);
        }

        .featured-case__stats {
            display: flex;
            gap: var(--spacing-md);
            flex-wrap: wrap;
            margin-top: var(--spacing-sm);
        }

        .featured-case__stat {
            text-align: center;
        }

        .featured-case__stat-value {
            font-family: var(--font-mono);
            font-size: 30px;
            font-weight: 800;
            color: var(--accent-primary);
            letter-spacing: -0.02em;
        }

        .featured-case__stat-label {
            font-size: 12px;
            color: var(--text-tertiary);
        }

        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }

        .tag-pill {
            display: inline-flex;
            align-items: center;
            padding: 8px 18px;
            font-size: 13px;
            font-weight: 600;
            color: var(--text-secondary);
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: 999px;
            transition: all var(--transition-fast);
            white-space: nowrap;
        }

        .tag-pill:hover {
            color: var(--accent-primary);
            border-color: var(--border-color-strong);
            background-color: var(--accent-primary-dim);
        }

        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 14px;
        }

        .comparison-table th {
            text-align: left;
            padding: 12px 16px;
            font-weight: 700;
            color: var(--accent-secondary);
            border-bottom: 2px solid var(--border-color-strong);
            white-space: nowrap;
            font-size: 13px;
            letter-spacing: 0.02em;
        }

        .comparison-table td {
            padding: 12px 16px;
            color: var(--text-secondary);
            border-bottom: 1px solid var(--border-light);
            vertical-align: middle;
        }

        .comparison-table tr:last-child td {
            border-bottom: none;
        }

        .comparison-table .mono {
            font-family: var(--font-mono);
            font-weight: 700;
            color: var(--text-primary);
        }

        .comparison-table .highlight {
            color: var(--accent-primary);
            font-weight: 700;
        }

        .table-wrapper {
            overflow-x: auto;
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            padding: var(--spacing-sm);
        }

        .subscribe-box {
            background: linear-gradient(135deg, var(--bg-elevated) 0%, var(--bg-secondary) 60%, var(--bg-tertiary) 100%);
            border: 1px solid var(--border-color-strong);
            border-radius: var(--radius-xl);
            padding: var(--spacing-lg);
            display: grid;
            grid-template-columns: 1fr auto;
            gap: var(--spacing-md);
            align-items: center;
            position: relative;
            overflow: hidden;
        }

        .subscribe-box::after {
            content: '';
            position: absolute;
            top: -50%;
            right: -15%;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(232, 139, 42, 0.1) 0%, transparent 70%);
            pointer-events: none;
        }

        .subscribe-box__title {
            font-size: 20px;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 6px;
        }

        .subscribe-box__desc {
            font-size: 14px;
            color: var(--text-tertiary);
            line-height: 1.6;
        }

        .faq-list {
            display: flex;
            flex-direction: column;
            gap: var(--spacing-sm);
        }

        .faq-item {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: var(--spacing-md);
            transition: all var(--transition-base);
        }

        .faq-item:hover {
            border-color: var(--border-color-strong);
        }

        .faq-item__question {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
            display: flex;
            align-items: flex-start;
            gap: 10px;
        }

        .faq-item__question::before {
            content: 'Q';
            flex-shrink: 0;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 24px;
            height: 24px;
            font-size: 12px;
            font-weight: 900;
            color: #0E1216;
            background-color: var(--accent-primary);
            border-radius: 6px;
        }

        .faq-item__answer {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            padding-left: 34px;
        }

        .related-scene-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--spacing-sm);
        }

        .scene-mini-card {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: var(--spacing-md);
            transition: all var(--transition-base);
            text-align: center;
        }

        .scene-mini-card:hover {
            border-color: var(--border-color-strong);
            transform: translateY(-2px);
            box-shadow: var(--shadow-low);
        }

        .scene-mini-card__icon {
            font-size: 28px;
            margin-bottom: 8px;
            display: block;
        }

        .scene-mini-card__title {
            font-size: 14px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 4px;
        }

        .scene-mini-card__desc {
            font-size: 12px;
            color: var(--text-tertiary);
            line-height: 1.5;
        }

        @media (max-width: 1024px) {
            .case-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .featured-case {
                grid-template-columns: 1fr;
                padding: var(--spacing-md);
            }

            .footer-main {
                grid-template-columns: 1fr 1fr;
            }

            .related-scene-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .header-top {
                flex-direction: column;
                align-items: stretch;
                gap: var(--spacing-sm);
            }

            .header-actions {
                justify-content: space-between;
            }

            .search-box {
                min-width: 0;
                flex: 1;
            }

            .header-nav {
                gap: 2px;
            }

            .nav-tab {
                padding: 7px 14px;
                font-size: 13px;
            }

            .case-grid {
                grid-template-columns: 1fr;
            }

            .subscribe-box {
                grid-template-columns: 1fr;
                padding: var(--spacing-md);
            }

            .footer-main {
                grid-template-columns: 1fr;
                gap: var(--spacing-md);
            }

            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }

            .comparison-table {
                font-size: 12px;
            }

            .comparison-table th,
            .comparison-table td {
                padding: 8px 10px;
            }

            .related-scene-grid {
                grid-template-columns: 1fr;
            }

            .featured-case__stats {
                flex-direction: column;
                align-items: flex-start;
            }

            .section {
                padding: var(--spacing-lg) 0;
            }
        }

        @media (max-width: 520px) {
            .page-hero h1 {
                font-size: 1.5rem;
            }

            .header-actions .btn--sm {
                padding: 8px 12px;
                font-size: 12px;
                height: 36px;
            }

            .search-box {
                height: 36px;
                min-width: 0;
            }

            .case-card__title {
                font-size: 15px;
            }

            .featured-case__title {
                font-size: 19px;
            }
        }

/* roulang: framework shim */
/* 覆盖 Bootstrap 等对 a/btn 的全局默认，避免导航出现下划线/蓝链 */
.site-header a,.site-header a:hover,.navbar a,.navbar a:hover,.nav-links a,.nav-links a:hover,header nav a,header nav a:hover{text-decoration:none}
.site-header .btn,.navbar .btn,.nav-cta{text-decoration:none}