/* roulang page: index */
:root {
            --bg-primary: #0f1117;
            --bg-secondary: #151824;
            --bg-tertiary: #1c1f2e;
            --bg-card: rgba(28, 31, 46, 0.85);
            --text-primary: #f0f2f7;
            --text-secondary: #9aa3b8;
            --text-muted: #6b7280;
            --accent-cyan: #3ee6c8;
            --accent-cyan-hover: #5ff0d6;
            --accent-cyan-dim: rgba(62, 230, 200, 0.12);
            --accent-amber: #d5a04a;
            --accent-amber-hover: #e8b860;
            --accent-amber-dim: rgba(213, 160, 74, 0.14);
            --border-color: #2a2e3f;
            --border-light: #353a50;
            --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.35);
            --shadow-hover: 0 8px 32px rgba(0, 0, 0, 0.5);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 18px;
            --radius-xl: 24px;
            --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans CJK SC', system-ui, sans-serif;
            --font-mono: 'Roboto Mono', 'JetBrains Mono', 'Courier New', monospace;
            --section-padding: 72px 0;
            --section-padding-mobile: 48px 0;
            --transition-fast: 0.18s ease;
            --transition-med: 0.28s ease;
        }

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

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

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

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

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

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

        button {
            cursor: pointer;
            font-family: var(--font-body);
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 28px;
        }

        @media (max-width: 640px) {
            .container {
                padding: 0 16px;
            }
        }

        /* Header */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(15, 17, 23, 0.93);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-color);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 12px 0;
            gap: 20px;
            flex-wrap: wrap;
        }

        .logo-block {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--accent-cyan-dim), var(--accent-cyan));
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 18px;
            color: var(--bg-primary);
            letter-spacing: -0.5px;
        }

        .logo-text {
            font-size: 20px;
            font-weight: 700;
            letter-spacing: 0.5px;
            color: var(--text-primary);
        }

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

        .header-search {
            flex: 1;
            max-width: 360px;
            min-width: 180px;
            position: relative;
        }

        .header-search input {
            width: 100%;
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: 10px;
            padding: 10px 14px 10px 40px;
            color: var(--text-primary);
            font-size: 14px;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
            height: 42px;
        }

        .header-search input::placeholder {
            color: var(--text-muted);
        }

        .header-search input:focus {
            outline: none;
            border-color: var(--accent-cyan);
            box-shadow: 0 0 0 2px var(--accent-cyan-dim);
        }

        .header-search .fa-magnifying-glass {
            position: absolute;
            left: 14px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--text-muted);
            font-size: 14px;
            pointer-events: none;
        }

        .header-right {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }

        .version-badge {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 6px 14px;
            font-size: 13px;
            color: var(--text-secondary);
            white-space: nowrap;
        }

        .version-badge .fa-chevron-down {
            margin-left: 6px;
            font-size: 10px;
        }

        .btn-subscribe-top {
            background: var(--accent-cyan);
            color: var(--bg-primary);
            border: none;
            border-radius: 8px;
            padding: 8px 16px;
            font-size: 14px;
            font-weight: 600;
            transition: background var(--transition-fast), transform var(--transition-fast);
            white-space: nowrap;
        }

        .btn-subscribe-top:hover {
            background: var(--accent-cyan-hover);
            transform: translateY(-1px);
        }

        .btn-subscribe-top:focus {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }

        .hamburger {
            display: none;
            background: transparent;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            width: 42px;
            height: 42px;
            align-items: center;
            justify-content: center;
            color: var(--text-primary);
            font-size: 20px;
        }

        /* Navigation */
        .main-nav {
            border-top: 1px solid var(--border-color);
            padding: 8px 0;
        }

        .nav-list {
            display: flex;
            gap: 6px;
            list-style: none;
            align-items: center;
            flex-wrap: wrap;
        }

        .nav-list li a {
            display: block;
            padding: 8px 18px;
            border-radius: 8px;
            color: var(--text-secondary);
            font-size: 15px;
            font-weight: 500;
            transition: color var(--transition-fast), background var(--transition-fast);
        }

        .nav-list li a:hover {
            color: var(--text-primary);
            background: var(--bg-card);
        }

        .nav-list li a.active {
            color: var(--accent-cyan);
            background: var(--accent-cyan-dim);
        }

        @media (max-width: 1024px) {
            .header-search {
                max-width: 240px;
            }
        }

        @media (max-width: 768px) {
            .header-search {
                display: none;
            }
            .version-badge {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .main-nav {
                display: none;
                padding: 8px 0 12px;
            }
            .main-nav.open {
                display: block;
            }
            .nav-list {
                flex-direction: column;
                gap: 3px;
            }
            .nav-list li a {
                padding: 10px 14px;
                border-radius: 6px;
            }
        }

        /* Hero Section */
        .hero-section {
            position: relative;
            overflow: hidden;
            min-height: 580px;
            display: flex;
            align-items: center;
            padding: var(--section-padding);
            background-image: url('/assets/images/34e00e8626eb8dd2.webp');
            background-size: cover;
            background-position: center;
            border-bottom: 1px solid var(--border-color);
        }

        .hero-overlay {
            position: absolute;
            inset: 0;
            background: rgba(15, 17, 23, 0.55);
            z-index: 1;
        }

        .hero-overlay::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(15, 17, 23, 0.35) 30%, rgba(15, 17, 23, 0.9) 100%);
            z-index: 2;
        }

        .hero-content {
            position: relative;
            z-index: 3;
            max-width: 720px;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--accent-cyan-dim);
            border: 1px solid rgba(62, 230, 200, 0.3);
            color: var(--accent-cyan);
            border-radius: 20px;
            padding: 6px 16px;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 0.3px;
            margin-bottom: 20px;
        }

        .hero-title {
            font-size: 38px;
            font-weight: 700;
            line-height: 1.25;
            margin-bottom: 20px;
            letter-spacing: 0.5px;
            color: var(--text-primary);
        }

        .hero-title .accent {
            color: var(--accent-cyan);
        }

        .hero-desc {
            font-size: 16px;
            line-height: 1.85;
            color: var(--text-secondary);
            max-width: 620px;
            margin-bottom: 28px;
        }

        .hero-actions {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
            align-items: center;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--accent-cyan);
            color: var(--bg-primary);
            border: none;
            border-radius: 10px;
            padding: 12px 24px;
            font-size: 15px;
            font-weight: 600;
            transition: background var(--transition-fast), transform var(--transition-fast);
        }

        .btn-primary:hover {
            background: var(--accent-cyan-hover);
            color: var(--bg-primary);
            transform: translateY(-2px);
        }

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

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: transparent;
            color: var(--text-primary);
            border: 1px solid var(--border-light);
            border-radius: 10px;
            padding: 12px 24px;
            font-size: 15px;
            font-weight: 500;
            transition: border-color var(--transition-fast), background var(--transition-fast);
        }

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

        .btn-secondary:focus {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }

        .play-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: rgba(62, 230, 200, 0.18);
            border: 2px solid var(--accent-cyan);
            color: var(--accent-cyan);
            font-size: 20px;
            transition: background var(--transition-fast), transform var(--transition-fast);
        }

        .play-btn:hover {
            background: rgba(62, 230, 200, 0.3);
            transform: scale(1.06);
        }

        .hero-stats-mini {
            display: flex;
            gap: 28px;
            margin-top: 32px;
            flex-wrap: wrap;
        }

        .hero-stat-mini {
            display: flex;
            flex-direction: column;
        }

        .hero-stat-mini .value {
            font-family: var(--font-mono);
            font-size: 24px;
            font-weight: 700;
            color: var(--accent-cyan);
            letter-spacing: -0.5px;
        }

        .hero-stat-mini .label {
            font-size: 13px;
            color: var(--text-muted);
        }

        @media (max-width: 840px) {
            .hero-section {
                min-height: auto;
                padding: 48px 0;
            }
            .hero-title {
                font-size: 28px;
            }
            .hero-desc {
                font-size: 15px;
            }
            .hero-stats-mini {
                gap: 18px;
            }
        }

        /* Section Base */
        .section {
            padding: var(--section-padding);
            position: relative;
        }

        .section-alt {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }

        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 1.5px;
            text-transform: uppercase;
            color: var(--accent-cyan);
            margin-bottom: 12px;
        }

        .section-title {
            font-size: 28px;
            font-weight: 700;
            line-height: 1.35;
            margin-bottom: 14px;
            letter-spacing: 0.3px;
        }

        .section-desc {
            font-size: 15px;
            line-height: 1.8;
            color: var(--text-secondary);
            max-width: 720px;
            margin-bottom: 28px;
        }

        @media (max-width: 640px) {
            .section {
                padding: var(--section-padding-mobile);
            }
            .section-title {
                font-size: 22px;
            }
        }

        /* Metric Dashboard */
        .metrics-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
        }

        .metric-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 20px;
            position: relative;
            overflow: hidden;
            transition: border-color var(--transition-fast), transform var(--transition-fast);
        }

        .metric-card:hover {
            border-color: var(--border-light);
            transform: translateY(-2px);
        }

        .metric-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: var(--accent-cyan);
            opacity: 0.7;
        }

        .metric-card .metric-value {
            font-family: var(--font-mono);
            font-size: 28px;
            font-weight: 700;
            color: var(--accent-cyan);
            letter-spacing: -0.5px;
            margin-bottom: 4px;
        }

        .metric-card .metric-unit {
            font-size: 13px;
            color: var(--text-muted);
            margin-left: 4px;
        }

        .metric-card .metric-label {
            font-size: 14px;
            color: var(--text-secondary);
            font-weight: 500;
            margin-bottom: 8px;
        }

        .metric-card .metric-trend {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            font-size: 12px;
            font-weight: 600;
            border-radius: 6px;
            padding: 3px 10px;
        }

        .trend-up {
            color: var(--accent-cyan);
            background: var(--accent-cyan-dim);
        }

        .trend-stable {
            color: var(--accent-amber);
            background: var(--accent-amber-dim);
        }

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

        @media (max-width: 520px) {
            .metrics-grid {
                grid-template-columns: 1fr;
            }
        }

        /* Service Matrix */
        .service-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 18px;
        }

        .service-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            position: relative;
            transition: border-color var(--transition-med), box-shadow var(--transition-med), transform var(--transition-med);
        }

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

        .service-card .service-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: var(--accent-cyan-dim);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 16px;
            font-size: 20px;
            color: var(--accent-cyan);
        }

        .service-card h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 10px;
            color: var(--text-primary);
        }

        .service-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 16px;
        }

        .service-card .service-link {
            font-size: 14px;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

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

        @media (max-width: 640px) {
            .service-grid {
                grid-template-columns: 1fr;
            }
        }

        /* Comparison Section */
        .comparison-wrap {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-top: 10px;
        }

        .compare-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 28px;
            transition: border-color var(--transition-med);
        }

        .compare-card.featured {
            border-color: var(--accent-cyan);
            background: rgba(28, 31, 46, 0.95);
        }

        .compare-card h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .compare-card h3 .fa-circle-check {
            color: var(--accent-cyan);
        }

        .compare-card h3 .fa-circle-question {
            color: var(--accent-amber);
        }

        .compare-list {
            list-style: none;
            padding: 0;
        }

        .compare-list li {
            padding: 10px 0;
            border-bottom: 1px solid var(--border-color);
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            color: var(--text-secondary);
        }

        .compare-list li:last-child {
            border-bottom: none;
        }

        .compare-list li .fa-check {
            color: var(--accent-cyan);
            font-size: 13px;
        }

        .compare-list li .fa-xmark {
            color: var(--accent-amber);
            font-size: 13px;
        }

        .compare-bar {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-top: 8px;
        }

        .compare-bar .bar-track {
            flex: 1;
            height: 6px;
            background: var(--bg-tertiary);
            border-radius: 3px;
            overflow: hidden;
        }

        .compare-bar .bar-fill {
            height: 100%;
            background: var(--accent-cyan);
            border-radius: 3px;
        }

        .compare-bar .bar-label {
            font-size: 12px;
            color: var(--text-muted);
            min-width: 52px;
            text-align: right;
        }

        @media (max-width: 768px) {
            .comparison-wrap {
                grid-template-columns: 1fr;
            }
        }

        /* Milestone Timeline */
        .timeline-horizontal {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 16px;
            position: relative;
            margin-top: 20px;
        }

        .timeline-item {
            text-align: left;
            position: relative;
            padding-top: 24px;
        }

        .timeline-item::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: var(--bg-tertiary);
            border-radius: 2px;
        }

        .timeline-item::after {
            content: '';
            position: absolute;
            top: -5px;
            left: 0;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--accent-cyan);
            border: 2px solid var(--bg-primary);
        }

        .timeline-item .tl-date {
            font-family: var(--font-mono);
            font-size: 13px;
            color: var(--accent-cyan);
            font-weight: 600;
            margin-bottom: 6px;
        }

        .timeline-item .tl-text {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.65;
        }

        @media (max-width: 768px) {
            .timeline-horizontal {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .timeline-item {
                padding-top: 0;
                padding-left: 24px;
            }
            .timeline-item::before {
                top: 0;
                bottom: 0;
                left: 0;
                right: auto;
                width: 3px;
                height: auto;
            }
            .timeline-item::after {
                top: 0;
                left: -5px;
            }
        }

        /* News List */
        .news-list {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 18px;
        }

        .news-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: border-color var(--transition-med), box-shadow var(--transition-med), transform var(--transition-med);
        }

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

        .news-card .news-img {
            aspect-ratio: 16 / 9;
            overflow: hidden;
            background: var(--bg-tertiary);
        }

        .news-card .news-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-med);
        }

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

        .news-card .news-body {
            padding: 18px 20px 20px;
        }

        .news-card .news-tag {
            display: inline-block;
            font-size: 12px;
            font-weight: 600;
            color: var(--accent-amber);
            background: var(--accent-amber-dim);
            border-radius: 4px;
            padding: 2px 8px;
            margin-bottom: 8px;
        }

        .news-card h3 {
            font-size: 16px;
            font-weight: 600;
            line-height: 1.5;
            margin-bottom: 8px;
            color: var(--text-primary);
        }

        .news-card p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.6;
        }

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

        @media (max-width: 640px) {
            .news-list {
                grid-template-columns: 1fr;
            }
        }

        /* Brand Intro */
        .brand-intro-box {
            background: var(--bg-tertiary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-xl);
            padding: 36px 32px;
        }

        .brand-intro-box p {
            font-size: 15px;
            line-height: 1.9;
            color: var(--text-secondary);
            margin-bottom: 14px;
        }

        .brand-intro-box p:last-child {
            margin-bottom: 0;
        }

        /* Protection */
        .protection-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
        }

        .protection-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 22px 20px;
            display: flex;
            flex-direction: column;
            gap: 10px;
            transition: border-color var(--transition-fast);
        }

        .protection-card:hover {
            border-color: var(--border-light);
        }

        .protection-card .prot-icon {
            font-size: 22px;
            color: var(--accent-cyan);
        }

        .protection-card h3 {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
        }

        .protection-card p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.6;
        }

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

        @media (max-width: 520px) {
            .protection-grid {
                grid-template-columns: 1fr;
            }
        }

        /* Contributors */
        .contributor-list {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 14px;
        }

        .contributor-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 18px;
            display: flex;
            align-items: center;
            gap: 12px;
            transition: border-color var(--transition-fast);
        }

        .contributor-card:hover {
            border-color: var(--border-light);
        }

        .contributor-avatar {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--accent-cyan-dim);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: var(--accent-cyan);
            flex-shrink: 0;
        }

        .contributor-info .contrib-name {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-primary);
        }

        .contributor-info .contrib-role {
            font-size: 12px;
            color: var(--text-muted);
        }

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

        @media (max-width: 520px) {
            .contributor-list {
                grid-template-columns: 1fr;
            }
        }

        /* Quick Answers */
        .quick-answer-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 14px;
        }

        .quick-answer-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 18px 20px;
        }

        .quick-answer-item .qa-q {
            font-size: 15px;
            font-weight: 600;
            color: var(--accent-cyan);
            margin-bottom: 8px;
        }

        .quick-answer-item .qa-a {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        @media (max-width: 768px) {
            .quick-answer-list {
                grid-template-columns: 1fr;
            }
        }

        /* FAQ */
        .faq-list {
            max-width: 800px;
        }

        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            margin-bottom: 12px;
            overflow: hidden;
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 22px;
            cursor: pointer;
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            transition: color var(--transition-fast);
            user-select: none;
        }

        .faq-question:hover {
            color: var(--accent-cyan);
        }

        .faq-question .faq-toggle-icon {
            transition: transform var(--transition-fast);
            font-size: 14px;
            color: var(--text-muted);
            flex-shrink: 0;
        }

        .faq-item.open .faq-toggle-icon {
            transform: rotate(180deg);
            color: var(--accent-cyan);
        }

        .faq-answer {
            max-height: 0;
            padding: 0 22px;
            overflow: hidden;
            transition: max-height var(--transition-med), padding var(--transition-med);
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.75;
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 22px 18px;
        }

        /* Form */
        .form-box {
            background: var(--bg-tertiary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-xl);
            padding: 32px;
            max-width: 560px;
        }

        .form-box label {
            display: block;
            font-size: 14px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 6px;
        }

        .form-box input,
        .form-box select {
            width: 100%;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 10px 14px;
            color: var(--text-primary);
            font-size: 14px;
            margin-bottom: 16px;
            height: 44px;
            transition: border-color var(--transition-fast);
        }

        .form-box input:focus,
        .form-box select:focus {
            outline: none;
            border-color: var(--accent-cyan);
            box-shadow: 0 0 0 2px var(--accent-cyan-dim);
        }

        .form-box .form-hint {
            font-size: 12px;
            color: var(--text-muted);
            margin-top: -10px;
            margin-bottom: 14px;
        }

        .form-msg {
            display: none;
            font-size: 13px;
            font-weight: 600;
            margin-top: 12px;
            border-radius: 6px;
            padding: 8px 14px;
        }

        .form-msg.success {
            display: block;
            color: var(--accent-cyan);
            background: var(--accent-cyan-dim);
        }

        .form-msg.error {
            display: block;
            color: #e08080;
            background: rgba(224, 128, 128, 0.12);
        }

        /* Glossary */
        .glossary-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 14px;
        }

        .glossary-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 16px 18px;
        }

        .glossary-item .gloss-term {
            font-size: 15px;
            font-weight: 600;
            color: var(--accent-cyan);
            margin-bottom: 4px;
        }

        .glossary-item .gloss-def {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.6;
        }

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

        @media (max-width: 640px) {
            .glossary-grid {
                grid-template-columns: 1fr;
            }
        }

        /* Footer */
        .site-footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            padding: 48px 0 28px;
            margin-top: 0;
        }

        .footer-inner {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }

        .footer-brand .logo-block {
            margin-bottom: 12px;
        }

        .footer-brand p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.7;
            max-width: 280px;
        }

        .footer-col h4 {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 12px;
        }

        .footer-col ul {
            list-style: none;
            padding: 0;
        }

        .footer-col ul li {
            margin-bottom: 8px;
        }

        .footer-col ul li a {
            font-size: 13px;
            color: var(--text-muted);
            transition: color var(--transition-fast);
        }

        .footer-col ul li a:hover {
            color: var(--accent-cyan);
        }

        .footer-bottom {
            border-top: 1px solid var(--border-color);
            padding-top: 20px;
            text-align: center;
            font-size: 12px;
            color: var(--text-muted);
            line-height: 1.8;
        }

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

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

        @media (max-width: 768px) {
            .footer-inner {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
        }

        @media (max-width: 520px) {
            .footer-inner {
                grid-template-columns: 1fr;
                gap: 20px;
            }
        }

        /* Button active state */
        .btn-primary:active,
        .btn-secondary:active {
            transform: translateY(1px);
        }

        /* Skip link */
        .skip-link {
            position: absolute;
            top: -50px;
            left: 0;
            background: var(--accent-cyan);
            color: var(--bg-primary);
            padding: 10px 20px;
            z-index: 200;
            border-radius: 0 0 8px 0;
            font-weight: 600;
        }

        .skip-link:focus {
            top: 0;
        }

        /* Focus styles for accessibility */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }
        }

/* roulang page: category2 */
:root {
            --bg-primary: #0f1117;
            --bg-secondary: #151824;
            --bg-tertiary: #1c1f2e;
            --bg-card: rgba(28, 31, 46, 0.85);
            --text-primary: #f0f2f7;
            --text-secondary: #9aa3b8;
            --text-muted: #6b7280;
            --accent-cyan: #3ee6c8;
            --accent-cyan-hover: #5ff0d6;
            --accent-cyan-dim: rgba(62, 230, 200, 0.12);
            --accent-amber: #d5a04a;
            --accent-amber-hover: #e8b860;
            --accent-amber-dim: rgba(213, 160, 74, 0.14);
            --border-color: #2a2e3f;
            --border-light: #353a50;
            --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.35);
            --shadow-hover: 0 8px 32px rgba(0, 0, 0, 0.5);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 18px;
            --radius-xl: 24px;
            --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans CJK SC', system-ui, sans-serif;
            --font-mono: 'Roboto Mono', 'JetBrains Mono', 'Courier New', monospace;
            --section-padding: 72px 0;
            --section-padding-mobile: 48px 0;
            --transition-fast: 0.18s ease;
            --transition-med: 0.28s ease;
        }

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

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

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

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

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

        button {
            cursor: pointer;
            font-family: var(--font-body);
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 28px;
        }

        @media (max-width: 640px) {
            .container {
                padding: 0 16px;
            }
        }

        /* Header */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(15, 17, 23, 0.93);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-color);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 12px 0;
            gap: 20px;
            flex-wrap: wrap;
        }

        .logo-block {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--accent-cyan-dim), var(--accent-cyan));
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 18px;
            color: var(--bg-primary);
            letter-spacing: -0.5px;
        }

        .logo-text {
            font-size: 20px;
            font-weight: 700;
            letter-spacing: 0.5px;
            color: var(--text-primary);
            transition: color var(--transition-fast);
        }

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

        .header-search {
            flex: 1;
            max-width: 320px;
            min-width: 160px;
            position: relative;
            display: block;
        }

        .header-search input {
            width: 100%;
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: 10px;
            padding: 10px 14px 10px 40px;
            color: var(--text-primary);
            font-size: 14px;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
            height: 42px;
            font-family: var(--font-body);
            box-shadow: none;
            outline: none;
            -webkit-appearance: none;
            appearance: none;
        }

        .header-search input::placeholder {
            color: var(--text-muted);
        }

        .header-search input:focus {
            outline: none;
            border-color: var(--accent-cyan);
            box-shadow: 0 0 0 2px var(--accent-cyan-dim);
        }

        .header-search .fa-magnifying-glass {
            position: absolute;
            left: 14px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--text-muted);
            font-size: 14px;
            pointer-events: none;
        }

        .header-right {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }

        .version-badge {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 6px 14px;
            font-size: 13px;
            color: var(--text-secondary);
            white-space: nowrap;
        }

        .version-badge .fa-chevron-down {
            margin-left: 6px;
            font-size: 10px;
        }

        .btn-subscribe-top {
            background: var(--accent-cyan);
            color: var(--bg-primary);
            border: none;
            border-radius: 8px;
            padding: 9px 18px;
            font-size: 14px;
            font-weight: 600;
            transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
            white-space: nowrap;
            font-family: var(--font-body);
            -webkit-appearance: none;
            appearance: none;
        }

        .btn-subscribe-top:hover {
            background: var(--accent-cyan-hover);
            transform: translateY(-1px);
            box-shadow: 0 4px 14px rgba(62, 230, 200, 0.25);
        }

        .btn-subscribe-top:focus {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }

        /* Navigation */
        .main-nav {
            background: var(--bg-secondary);
            border-bottom: 1px solid var(--border-color);
        }

        .main-nav .container {
            padding: 0 28px;
        }

        @media (max-width: 640px) {
            .main-nav .container {
                padding: 0 16px;
            }
        }

        .nav-list {
            display: flex;
            align-items: center;
            list-style: none;
            margin: 0;
            padding: 0;
            gap: 4px;
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: thin;
            scrollbar-color: var(--border-light) transparent;
        }

        .nav-list::-webkit-scrollbar {
            height: 3px;
        }

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

        .nav-list::-webkit-scrollbar-thumb {
            background: var(--border-light);
            border-radius: 3px;
        }

        .nav-list li {
            flex-shrink: 0;
        }

        .nav-list a {
            display: block;
            padding: 13px 18px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
            border-bottom: 2px solid transparent;
            transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
            white-space: nowrap;
            border-radius: 6px 6px 0 0;
        }

        .nav-list a:hover {
            color: var(--text-primary);
            background: var(--bg-tertiary);
        }

        .nav-list a.active {
            color: var(--accent-cyan);
            border-bottom-color: var(--accent-cyan);
            font-weight: 600;
            background: transparent;
        }

        .nav-list a:focus-visible {
            outline: 2px solid var(--accent-cyan);
            outline-offset: -2px;
        }

        /* Breadcrumb */
        .breadcrumb-bar {
            background: var(--bg-primary);
            border-bottom: 1px solid var(--border-color);
            padding: 12px 0;
        }

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

        .breadcrumb li {
            display: flex;
            align-items: center;
        }

        .breadcrumb li + li::before {
            content: '/';
            margin: 0 10px;
            color: var(--text-muted);
            font-size: 12px;
        }

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

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

        .breadcrumb .current {
            color: var(--accent-cyan);
            font-weight: 500;
        }

        /* Main layout with sidebar */
        .page-layout {
            display: flex;
            gap: 32px;
            padding: 40px 0 64px;
            align-items: flex-start;
        }

        .doc-sidebar {
            width: 260px;
            flex-shrink: 0;
            position: sticky;
            top: 120px;
            max-height: calc(100vh - 140px);
            overflow-y: auto;
        }

        .doc-sidebar-inner {
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 18px 12px;
        }

        .doc-sidebar-title {
            font-size: 12px;
            font-weight: 600;
            color: var(--text-muted);
            letter-spacing: 1px;
            text-transform: uppercase;
            padding: 0 8px 12px;
            margin-bottom: 8px;
            border-bottom: 1px solid var(--border-color);
        }

        .doc-sidebar-list {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .doc-sidebar-list li {
            margin-bottom: 2px;
        }

        .doc-sidebar-list a {
            display: block;
            padding: 9px 8px;
            font-size: 14px;
            color: var(--text-secondary);
            border-left: 3px solid transparent;
            border-radius: 4px;
            transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
        }

        .doc-sidebar-list a:hover {
            color: var(--text-primary);
            background: var(--bg-tertiary);
            border-left-color: var(--accent-cyan);
        }

        .doc-sidebar-list a.current {
            color: var(--accent-cyan);
            border-left-color: var(--accent-cyan);
            background: var(--accent-cyan-dim);
            font-weight: 500;
        }

        .page-content {
            flex: 1;
            min-width: 0;
        }

        /* Section styling */
        .section {
            padding: 36px 0;
        }

        .section-title {
            font-size: 22px;
            font-weight: 700;
            letter-spacing: 0.5px;
            color: var(--text-primary);
            margin-bottom: 8px;
        }

        .section-subtitle {
            font-size: 15px;
            color: var(--text-secondary);
            margin-bottom: 24px;
            line-height: 1.7;
        }

        .section-divider {
            border: 0;
            height: 1px;
            background: var(--border-color);
            margin: 24px 0;
        }

        /* Category intro */
        .category-intro {
            padding-bottom: 8px;
        }

        .category-intro h1 {
            font-size: 32px;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: 0.5px;
            margin-bottom: 12px;
            line-height: 1.3;
        }

        .category-intro .intro-text {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 8px;
        }

        /* Data brief section */
        .brief-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
            margin-top: 12px;
        }

        .brief-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 18px 16px;
            transition: transform var(--transition-med), box-shadow var(--transition-med), border-color var(--transition-med);
        }

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

        .brief-card .brief-label {
            font-size: 12px;
            color: var(--text-muted);
            margin-bottom: 8px;
            letter-spacing: 0.5px;
        }

        .brief-card .brief-value {
            font-family: var(--font-mono);
            font-size: 28px;
            font-weight: 700;
            color: var(--accent-cyan);
            line-height: 1.2;
            margin-bottom: 4px;
        }

        .brief-card .brief-unit {
            font-size: 13px;
            color: var(--text-secondary);
            font-family: var(--font-mono);
        }

        .brief-card .brief-trend {
            font-size: 12px;
            color: var(--accent-amber);
            margin-top: 6px;
            display: flex;
            align-items: center;
            gap: 4px;
        }

        /* Entry cards */
        .entry-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
            margin-top: 12px;
        }

        .entry-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 20px;
            display: flex;
            gap: 16px;
            align-items: flex-start;
            transition: transform var(--transition-med), box-shadow var(--transition-med), border-color var(--transition-med);
        }

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

        .entry-number {
            font-family: var(--font-mono);
            font-size: 14px;
            font-weight: 600;
            color: var(--accent-amber);
            background: var(--accent-amber-dim);
            border-radius: 6px;
            padding: 4px 10px;
            min-width: 40px;
            text-align: center;
            flex-shrink: 0;
        }

        .entry-body {
            flex: 1;
            min-width: 0;
        }

        .entry-body h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 6px;
            line-height: 1.4;
        }

        .entry-body p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin: 0;
        }

        .entry-detail {
            font-size: 13px;
            color: var(--text-muted);
            margin-top: 6px;
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }

        /* Topic cards */
        .topic-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
            margin-top: 12px;
        }

        .topic-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: transform var(--transition-med), box-shadow var(--transition-med), border-color var(--transition-med);
        }

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

        .topic-card img {
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
        }

        .topic-card-body {
            padding: 18px 20px;
        }

        .topic-card-body h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 8px;
            line-height: 1.4;
        }

        .topic-card-body p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin: 0;
        }

        /* Tools grid */
        .tools-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
            margin-top: 12px;
        }

        .tool-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 20px;
            display: flex;
            gap: 14px;
            align-items: center;
            transition: transform var(--transition-med), box-shadow var(--transition-med), border-color var(--transition-med);
        }

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

        .tool-icon {
            width: 40px;
            height: 40px;
            border-radius: 10px;
            background: var(--accent-cyan-dim);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-cyan);
            font-size: 18px;
            flex-shrink: 0;
        }

        .tool-card h3 {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 4px;
        }

        .tool-card p {
            font-size: 13px;
            color: var(--text-secondary);
            margin: 0;
            line-height: 1.6;
        }

        /* Rules panel */
        .rules-panel {
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 24px 28px;
            margin-top: 12px;
        }

        .rules-panel h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 12px;
        }

        .rules-panel p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin: 0 0 8px;
        }

        .rules-panel p:last-child {
            margin-bottom: 0;
        }

        /* FAQ */
        .faq-list {
            margin-top: 12px;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            overflow: hidden;
        }

        .faq-item {
            border-bottom: 1px solid var(--border-color);
            background: var(--bg-card);
            transition: background var(--transition-fast);
        }

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

        .faq-item:hover {
            background: var(--bg-tertiary);
        }

        .faq-question {
            width: 100%;
            text-align: left;
            background: transparent;
            border: none;
            padding: 18px 22px;
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            font-family: var(--font-body);
            -webkit-appearance: none;
            appearance: none;
            cursor: pointer;
            transition: color var(--transition-fast);
        }

        .faq-question:hover {
            color: var(--accent-cyan);
        }

        .faq-question:focus-visible {
            outline: 2px solid var(--accent-cyan);
            outline-offset: -2px;
        }

        .faq-question .fa-chevron-down {
            font-size: 13px;
            color: var(--text-muted);
            transition: transform var(--transition-med), color var(--transition-fast);
            flex-shrink: 0;
        }

        .faq-question[aria-expanded="true"] .fa-chevron-down {
            transform: rotate(180deg);
            color: var(--accent-cyan);
        }

        .faq-answer {
            padding: 0 22px 18px;
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.8;
            display: none;
        }

        .faq-answer.is-open {
            display: block;
        }

        /* View more */
        .view-more-wrap {
            text-align: center;
            padding: 24px 0 8px;
        }

        .btn-view-more {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--accent-cyan);
            color: var(--bg-primary);
            border: none;
            border-radius: 10px;
            padding: 12px 28px;
            font-size: 15px;
            font-weight: 600;
            font-family: var(--font-body);
            transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
            -webkit-appearance: none;
            appearance: none;
            text-decoration: none;
        }

        .btn-view-more:hover {
            background: var(--accent-cyan-hover);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(62, 230, 200, 0.3);
            color: var(--bg-primary);
        }

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

        .btn-view-more .fa-arrow-right {
            font-size: 14px;
        }

        /* Footer */
        .site-footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            padding: 48px 0 28px;
            margin-top: 40px;
        }

        .site-footer .container {
            padding: 0 28px;
        }

        @media (max-width: 640px) {
            .site-footer .container {
                padding: 0 16px;
            }
        }

        .footer-inner {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 36px;
            margin-bottom: 32px;
        }

        .footer-brand .logo-block {
            margin-bottom: 14px;
        }

        .footer-brand p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin: 0;
            max-width: 320px;
        }

        .footer-col h4 {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 14px;
            letter-spacing: 0.5px;
        }

        .footer-col ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .footer-col ul li {
            margin-bottom: 8px;
        }

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

        .footer-col ul a:hover {
            color: var(--accent-cyan);
        }

        .footer-bottom {
            border-top: 1px solid var(--border-color);
            padding-top: 20px;
            display: flex;
            flex-wrap: wrap;
            gap: 12px 24px;
            font-size: 12px;
            color: var(--text-muted);
            align-items: center;
            justify-content: space-between;
        }

        .footer-bottom p {
            margin: 0;
        }

        .footer-bottom a {
            color: var(--text-muted);
            transition: color var(--transition-fast);
        }

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

        /* Responsive */
        @media (max-width: 1024px) {
            .page-layout {
                gap: 24px;
            }

            .doc-sidebar {
                width: 220px;
                top: 110px;
            }

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

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

        @media (max-width: 768px) {
            .page-layout {
                flex-direction: column;
                gap: 20px;
                padding: 24px 0 48px;
            }

            .doc-sidebar {
                width: 100%;
                position: static;
                max-height: none;
                overflow-y: visible;
            }

            .doc-sidebar-inner {
                padding: 12px;
            }

            .doc-sidebar-list {
                display: flex;
                gap: 6px;
                overflow-x: auto;
                -webkit-overflow-scrolling: touch;
                scrollbar-width: thin;
                scrollbar-color: var(--border-light) transparent;
                padding-bottom: 4px;
            }

            .doc-sidebar-list li {
                flex-shrink: 0;
                margin-bottom: 0;
            }

            .doc-sidebar-list a {
                white-space: nowrap;
                padding: 8px 14px;
                border-left: none;
                border-bottom: 2px solid transparent;
                border-radius: 6px;
                background: var(--bg-tertiary);
            }

            .doc-sidebar-list a:hover {
                border-left: none;
                border-bottom-color: var(--accent-cyan);
            }

            .doc-sidebar-list a.current {
                border-left: none;
                border-bottom-color: var(--accent-cyan);
                background: var(--accent-cyan-dim);
            }

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

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

            .footer-inner {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }

            .header-inner {
                gap: 12px;
            }

            .header-search {
                order: 3;
                max-width: 100%;
                flex-basis: 100%;
            }

            .category-intro h1 {
                font-size: 26px;
            }
        }

        @media (max-width: 640px) {
            .brief-grid {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }

            .brief-card .brief-value {
                font-size: 22px;
            }

            .tools-grid {
                grid-template-columns: 1fr;
                gap: 10px;
            }

            .topic-grid {
                gap: 12px;
            }

            .entry-grid {
                gap: 12px;
            }

            .footer-inner {
                grid-template-columns: 1fr;
                gap: 20px;
            }

            .footer-bottom {
                flex-direction: column;
                gap: 8px;
                align-items: flex-start;
            }

            .section-title {
                font-size: 18px;
            }

            .category-intro h1 {
                font-size: 22px;
            }

            .rules-panel {
                padding: 18px 16px;
            }

            .faq-question {
                padding: 14px 16px;
                font-size: 14px;
            }

            .faq-answer {
                padding: 0 16px 14px;
                font-size: 13px;
            }
        }

        @media (max-width: 375px) {
            .brief-grid {
                grid-template-columns: 1fr;
            }

            .brief-card .brief-value {
                font-size: 24px;
            }

            .entry-card {
                padding: 14px;
                gap: 10px;
            }

            .entry-number {
                font-size: 12px;
                min-width: 34px;
                padding: 3px 8px;
            }

            .entry-body h3 {
                font-size: 14px;
            }

            .entry-body p {
                font-size: 13px;
            }
        }

        /* Foundation overrides */
        .grid-container,
        .grid-x,
        .cell {
            background: transparent;
        }

        button,
        input,
        select,
        textarea {
            font-family: var(--font-body);
        }

        input:focus,
        select:focus,
        textarea:focus {
            outline: none;
            box-shadow: none;
        }

        /* Scrollbar styling for sidebar */
        .doc-sidebar::-webkit-scrollbar {
            width: 4px;
        }

        .doc-sidebar::-webkit-scrollbar-track {
            background: transparent;
        }

        .doc-sidebar::-webkit-scrollbar-thumb {
            background: var(--border-light);
            border-radius: 4px;
        }

/* roulang page: category3 */
:root {
            --bg-primary: #0f1117;
            --bg-secondary: #151824;
            --bg-tertiary: #1c1f2e;
            --bg-card: rgba(28, 31, 46, 0.85);
            --text-primary: #f0f2f7;
            --text-secondary: #9aa3b8;
            --text-muted: #6b7280;
            --accent-cyan: #3ee6c8;
            --accent-cyan-hover: #5ff0d6;
            --accent-cyan-dim: rgba(62, 230, 200, 0.12);
            --accent-amber: #d5a04a;
            --accent-amber-hover: #e8b860;
            --accent-amber-dim: rgba(213, 160, 74, 0.14);
            --border-color: #2a2e3f;
            --border-light: #353a50;
            --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.35);
            --shadow-hover: 0 8px 32px rgba(0, 0, 0, 0.5);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 18px;
            --radius-xl: 24px;
            --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans CJK SC', system-ui, sans-serif;
            --font-mono: 'Roboto Mono', 'JetBrains Mono', 'Courier New', monospace;
            --section-padding: 72px 0;
            --section-padding-mobile: 48px 0;
            --transition-fast: 0.18s ease;
            --transition-med: 0.28s ease;
        }

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

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

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

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

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

        button {
            cursor: pointer;
            font-family: var(--font-body);
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 28px;
        }

        @media (max-width: 640px) {
            .container {
                padding: 0 16px;
            }
        }

        /* Header */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(15, 17, 23, 0.93);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-color);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 12px 0;
            gap: 20px;
            flex-wrap: wrap;
        }

        .logo-block {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--accent-cyan-dim), var(--accent-cyan));
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 18px;
            color: var(--bg-primary);
            letter-spacing: -0.5px;
        }

        .logo-text {
            font-size: 20px;
            font-weight: 700;
            letter-spacing: 0.5px;
            color: var(--text-primary);
        }

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

        .header-search {
            flex: 1;
            max-width: 360px;
            min-width: 180px;
            position: relative;
        }

        .header-search input {
            width: 100%;
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: 10px;
            padding: 10px 14px 10px 40px;
            color: var(--text-primary);
            font-size: 14px;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
            height: 42px;
        }

        .header-search input::placeholder {
            color: var(--text-muted);
        }

        .header-search input:focus {
            outline: none;
            border-color: var(--accent-cyan);
            box-shadow: 0 0 0 2px var(--accent-cyan-dim);
        }

        .header-search .fa-magnifying-glass {
            position: absolute;
            left: 14px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--text-muted);
            font-size: 14px;
            pointer-events: none;
        }

        .header-right {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }

        .version-badge {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 6px 14px;
            font-size: 13px;
            color: var(--text-secondary);
            white-space: nowrap;
        }

        .version-badge .fa-chevron-down {
            margin-left: 6px;
            font-size: 10px;
        }

        .btn-subscribe-top {
            background: var(--accent-cyan);
            color: var(--bg-primary);
            border: none;
            border-radius: 8px;
            padding: 8px 16px;
            font-size: 14px;
            font-weight: 600;
            transition: background var(--transition-fast), transform var(--transition-fast);
            white-space: nowrap;
        }

        .btn-subscribe-top:hover {
            background: var(--accent-cyan-hover);
            transform: translateY(-1px);
        }

        .btn-subscribe-top:focus {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }

        .nav-toggle {
            display: none;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 8px 12px;
            color: var(--text-primary);
            font-size: 18px;
            transition: background var(--transition-fast);
        }

        .nav-toggle:hover {
            background: var(--bg-tertiary);
        }

        .nav-toggle:focus {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }

        /* Navigation */
        .main-nav {
            border-top: 1px solid var(--border-color);
            background: rgba(21, 24, 36, 0.85);
        }

        .main-nav .container {
            padding-top: 0;
            padding-bottom: 0;
        }

        .nav-list {
            display: flex;
            align-items: center;
            gap: 4px;
            list-style: none;
            margin: 0;
            padding: 0;
            flex-wrap: wrap;
        }

        .nav-list li {
            margin: 0;
        }

        .nav-list a {
            display: inline-block;
            padding: 10px 18px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: 6px;
            transition: color var(--transition-fast), background var(--transition-fast);
            position: relative;
        }

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

        .nav-list a.active {
            color: var(--accent-cyan);
            font-weight: 600;
        }

        .nav-list a.active::after {
            content: '';
            position: absolute;
            bottom: -1px;
            left: 18px;
            right: 18px;
            height: 2px;
            background: var(--accent-cyan);
            border-radius: 2px 2px 0 0;
        }

        .nav-list a:focus {
            outline: 2px solid var(--accent-cyan);
            outline-offset: -2px;
        }

        /* Breadcrumb */
        .breadcrumb-section {
            padding: 18px 0 0;
        }

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

        .breadcrumb li {
            margin: 0;
        }

        .breadcrumb li+li::before {
            content: '/';
            margin-right: 8px;
            color: var(--border-light);
        }

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

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

        .breadcrumb .current {
            color: var(--accent-cyan);
            font-weight: 500;
        }

        /* Category Hero */
        .category-hero {
            padding: 48px 0 40px;
            border-bottom: 1px solid var(--border-color);
            position: relative;
            overflow: hidden;
        }

        .category-hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-image: radial-gradient(circle at 80% 20%, var(--accent-cyan-dim) 0%, transparent 45%),
                radial-gradient(circle at 10% 80%, var(--accent-amber-dim) 0%, transparent 35%);
            pointer-events: none;
            z-index: 0;
        }

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

        .category-hero h1 {
            font-size: 34px;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0 0 14px;
            letter-spacing: -0.5px;
            line-height: 1.3;
        }

        .category-hero .category-lead {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 780px;
            line-height: 1.8;
            margin: 0;
        }

        .category-hero .category-meta {
            display: flex;
            align-items: center;
            gap: 18px;
            margin-top: 18px;
            flex-wrap: wrap;
        }

        .category-hero .category-meta span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 13px;
            color: var(--text-muted);
        }

        .category-hero .category-meta .badge-tag {
            background: var(--accent-cyan-dim);
            color: var(--accent-cyan);
            border: 1px solid rgba(62, 230, 200, 0.25);
            border-radius: 20px;
            padding: 4px 14px;
            font-size: 12px;
            font-weight: 600;
        }

        /* Layout with sidebar */
        .category-layout {
            display: flex;
            gap: 28px;
            align-items: flex-start;
            padding: 32px 0 56px;
        }

        .category-sidebar {
            width: 250px;
            flex-shrink: 0;
            position: sticky;
            top: 140px;
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 20px 0;
            max-height: calc(100vh - 160px);
            overflow-y: auto;
        }

        .category-sidebar-title {
            font-size: 13px;
            font-weight: 700;
            color: var(--text-muted);
            text-transform: uppercase;
            letter-spacing: 1px;
            padding: 0 20px 12px;
            border-bottom: 1px solid var(--border-color);
            margin-bottom: 8px;
        }

        .category-sidebar ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .category-sidebar li a {
            display: block;
            padding: 9px 20px;
            font-size: 14px;
            color: var(--text-secondary);
            border-left: 3px solid transparent;
            transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
        }

        .category-sidebar li a:hover {
            color: var(--text-primary);
            background: var(--bg-tertiary);
            border-left-color: var(--accent-cyan);
        }

        .category-sidebar li a.active {
            color: var(--accent-cyan);
            background: var(--accent-cyan-dim);
            border-left-color: var(--accent-cyan);
            font-weight: 600;
        }

        .category-sidebar li a:focus {
            outline: 2px solid var(--accent-cyan);
            outline-offset: -2px;
        }

        .category-main {
            flex: 1;
            min-width: 0;
        }

        /* Section Common */
        .cat-section {
            padding: 36px 0;
            border-bottom: 1px solid var(--border-color);
        }

        .cat-section:last-child {
            border-bottom: none;
            padding-bottom: 0;
        }

        .cat-section-header {
            display: flex;
            align-items: flex-end;
            justify-content: space-between;
            margin-bottom: 22px;
            gap: 12px;
            flex-wrap: wrap;
        }

        .cat-section-header h2 {
            font-size: 22px;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0;
            letter-spacing: -0.3px;
        }

        .cat-section-header .section-hint {
            font-size: 13px;
            color: var(--text-muted);
        }

        /* Strategy Cards */
        .strategy-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 18px;
        }

        .strategy-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 22px;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
            position: relative;
            overflow: hidden;
        }

        .strategy-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--accent-cyan), var(--accent-cyan-dim));
            opacity: 0;
            transition: opacity var(--transition-fast);
        }

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

        .strategy-card:hover::before {
            opacity: 1;
        }

        .strategy-card-top {
            display: flex;
            align-items: flex-start;
            justify-content: space-between;
            gap: 10px;
            margin-bottom: 10px;
        }

        .strategy-card h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0;
            line-height: 1.4;
        }

        .strategy-card .tag {
            flex-shrink: 0;
            border-radius: 20px;
            padding: 3px 12px;
            font-size: 12px;
            font-weight: 600;
            white-space: nowrap;
        }

        .tag-hot {
            background: var(--accent-amber-dim);
            color: var(--accent-amber);
            border: 1px solid rgba(213, 160, 74, 0.3);
        }

        .tag-new {
            background: var(--accent-cyan-dim);
            color: var(--accent-cyan);
            border: 1px solid rgba(62, 230, 200, 0.3);
        }

        .tag-basic {
            background: var(--bg-tertiary);
            color: var(--text-secondary);
            border: 1px solid var(--border-color);
        }

        .strategy-card .strategy-desc {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin: 0 0 16px;
        }

        .strategy-card .strategy-params {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-bottom: 14px;
        }

        .strategy-card .param-chip {
            font-size: 12px;
            background: var(--bg-tertiary);
            border: 1px solid var(--border-color);
            border-radius: 6px;
            padding: 3px 10px;
            color: var(--text-secondary);
            font-family: var(--font-mono);
            letter-spacing: 0.3px;
        }

        .strategy-card .strategy-footer {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding-top: 12px;
            border-top: 1px solid var(--border-color);
            gap: 8px;
            flex-wrap: wrap;
        }

        .strategy-card .strategy-stat {
            font-size: 13px;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .strategy-card .strategy-stat strong {
            color: var(--accent-cyan);
            font-family: var(--font-mono);
            font-weight: 600;
        }

        /* Comparison Section */
        .compare-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 18px;
        }

        .compare-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 22px;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
        }

        .compare-card:hover {
            border-color: var(--border-light);
            box-shadow: var(--shadow-card);
        }

        .compare-card h3 {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0 0 12px;
        }

        .compare-card .compare-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 8px 0;
            border-bottom: 1px solid var(--border-color);
            font-size: 13px;
            gap: 8px;
        }

        .compare-card .compare-row:last-child {
            border-bottom: none;
        }

        .compare-card .compare-label {
            color: var(--text-muted);
        }

        .compare-card .compare-value {
            color: var(--text-primary);
            font-weight: 600;
        }

        .compare-card .compare-value.highlight {
            color: var(--accent-cyan);
            font-family: var(--font-mono);
        }

        .rating-bar {
            width: 100%;
            height: 6px;
            background: var(--bg-tertiary);
            border-radius: 3px;
            overflow: hidden;
            margin-top: 4px;
        }

        .rating-bar-fill {
            height: 100%;
            border-radius: 3px;
            background: linear-gradient(90deg, var(--accent-cyan), var(--accent-cyan-hover));
            transition: width var(--transition-med);
        }

        /* Tips Section */
        .tips-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .tips-list li {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            padding: 16px 18px;
            font-size: 14px;
            color: var(--text-secondary);
            display: flex;
            align-items: flex-start;
            gap: 12px;
            line-height: 1.7;
        }

        .tips-list li .tip-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: 8px;
            background: var(--accent-cyan-dim);
            color: var(--accent-cyan);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 13px;
            font-weight: 600;
        }

        /* More link */
        .more-link-wrap {
            text-align: right;
            padding-top: 18px;
        }

        .more-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            font-weight: 600;
            color: var(--accent-cyan);
            transition: color var(--transition-fast), gap var(--transition-fast);
        }

        .more-link:hover {
            color: var(--accent-cyan-hover);
            gap: 10px;
        }

        .more-link:focus {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 3px;
            border-radius: 4px;
        }

        /* Hot Entries */
        .hot-entry-list {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 0;
        }

        .hot-entry-list li {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 12px 0;
            border-bottom: 1px solid var(--border-color);
            font-size: 14px;
        }

        .hot-entry-list li:last-child {
            border-bottom: none;
        }

        .hot-entry-list .entry-rank {
            flex-shrink: 0;
            width: 32px;
            height: 32px;
            border-radius: 8px;
            background: var(--bg-tertiary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-family: var(--font-mono);
            font-size: 13px;
            font-weight: 700;
            color: var(--text-muted);
        }

        .hot-entry-list .entry-rank.rank-top {
            background: var(--accent-amber-dim);
            color: var(--accent-amber);
            border: 1px solid rgba(213, 160, 74, 0.25);
        }

        .hot-entry-list .entry-name {
            flex: 1;
            color: var(--text-primary);
            font-weight: 500;
        }

        .hot-entry-list .entry-detail {
            color: var(--text-muted);
            font-size: 13px;
            flex-shrink: 0;
        }

        /* Related Tools */
        .tools-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
        }

        .tool-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            padding: 18px;
            display: flex;
            align-items: flex-start;
            gap: 12px;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
        }

        .tool-card:hover {
            border-color: var(--border-light);
            box-shadow: var(--shadow-card);
        }

        .tool-card .tool-icon {
            flex-shrink: 0;
            width: 38px;
            height: 38px;
            border-radius: 10px;
            background: var(--accent-cyan-dim);
            color: var(--accent-cyan);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
        }

        .tool-card h4 {
            font-size: 14px;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0 0 4px;
        }

        .tool-card p {
            font-size: 13px;
            color: var(--text-muted);
            margin: 0;
            line-height: 1.6;
        }

        /* Footer */
        .site-footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            padding: 48px 0 28px;
            margin-top: 16px;
        }

        .footer-inner {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }

        .footer-brand p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
            margin: 14px 0 0;
            max-width: 280px;
        }

        .footer-col h4 {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0 0 14px;
        }

        .footer-col ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .footer-col ul li {
            margin-bottom: 8px;
        }

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

        .footer-col ul li a:hover {
            color: var(--accent-cyan);
        }

        .footer-bottom {
            border-top: 1px solid var(--border-color);
            padding-top: 22px;
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 12px;
            color: var(--text-muted);
            align-items: center;
            justify-content: space-between;
        }

        .footer-bottom p {
            margin: 0;
        }

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

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

        /* Responsive */
        @media (max-width: 1024px) {
            .strategy-grid {
                grid-template-columns: 1fr;
            }

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

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

            .tips-list {
                grid-template-columns: 1fr;
            }

            .category-layout {
                gap: 20px;
            }

            .category-sidebar {
                width: 210px;
            }
        }

        @media (max-width: 768px) {
            .header-search {
                display: none;
            }

            .header-right .version-badge {
                display: none;
            }

            .nav-list a {
                padding: 8px 12px;
                font-size: 13px;
            }

            .category-hero h1 {
                font-size: 26px;
            }

            .category-layout {
                flex-direction: column;
                padding: 24px 0 40px;
            }

            .category-sidebar {
                width: 100%;
                position: static;
                max-height: none;
                padding: 14px 0;
                border-radius: var(--radius-sm);
            }

            .category-sidebar-title {
                display: none;
            }

            .category-sidebar ul {
                display: flex;
                gap: 4px;
                flex-wrap: wrap;
                padding: 0 12px;
            }

            .category-sidebar li {
                margin: 0;
            }

            .category-sidebar li a {
                padding: 8px 14px;
                font-size: 12px;
                border-left: none;
                border-radius: 6px;
                white-space: nowrap;
            }

            .category-sidebar li a:hover,
            .category-sidebar li a.active {
                border-left: none;
            }

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

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

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

            .footer-inner {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }

            .footer-brand {
                grid-column: 1 / -1;
            }

            .cat-section {
                padding: 28px 0;
            }

            .cat-section-header h2 {
                font-size: 19px;
            }
        }

        @media (max-width: 520px) {
            .header-inner {
                gap: 10px;
            }

            .logo-text {
                font-size: 17px;
            }

            .logo-icon {
                width: 32px;
                height: 32px;
                font-size: 15px;
                border-radius: 8px;
            }

            .btn-subscribe-top {
                padding: 6px 12px;
                font-size: 12px;
            }

            .nav-list a {
                padding: 6px 10px;
                font-size: 12px;
            }

            .nav-list a.active::after {
                left: 10px;
                right: 10px;
            }

            .category-hero {
                padding: 32px 0 28px;
            }

            .category-hero h1 {
                font-size: 22px;
            }

            .category-hero .category-lead {
                font-size: 14px;
                line-height: 1.7;
            }

            .strategy-card {
                padding: 16px;
            }

            .strategy-card h3 {
                font-size: 15px;
            }

            .compare-card {
                padding: 16px;
            }

            .footer-inner {
                grid-template-columns: 1fr;
                gap: 20px;
            }

            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: 6px;
            }

            .hot-entry-list .entry-detail {
                display: none;
            }

            .cat-section-header {
                flex-direction: column;
                align-items: flex-start;
                gap: 6px;
            }
        }

        @media (max-width: 375px) {
            .container {
                padding: 0 12px;
            }

            .header-inner {
                padding: 10px 0;
            }

            .nav-list {
                gap: 2px;
            }

            .nav-list a {
                padding: 6px 8px;
                font-size: 11px;
            }

            .category-hero h1 {
                font-size: 20px;
            }

            .strategy-card .strategy-footer {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }
        }

/* roulang page: category1 */
:root {
 --bg-primary: #0f1117;
 --bg-secondary: #151824;
 --bg-tertiary: #1c1f2e;
 --bg-card: rgba(28, 31, 46, 0.85);
 --text-primary: #f0f2f7;
 --text-secondary: #9aa3b8;
 --text-muted: #6b7280;
 --accent-cyan: #3ee6c8;
 --accent-cyan-hover: #5ff0d6;
 --accent-cyan-dim: rgba(62, 230, 200, 0.12);
 --accent-amber: #d5a04a;
 --accent-amber-hover: #e8b860;
 --accent-amber-dim: rgba(213, 160, 74, 0.14);
 --border-color: #2a2e3f;
 --border-light: #353a50;
 --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.35);
 --shadow-hover: 0 8px 32px rgba(0, 0, 0, 0.5);
 --radius-sm: 8px;
 --radius-md: 14px;
 --radius-lg: 18px;
 --radius-xl: 24px;
 --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans CJK SC', system-ui, sans-serif;
 --font-mono: 'Roboto Mono', 'JetBrains Mono', 'Courier New', monospace;
 --section-padding: 72px 0;
 --section-padding-mobile: 48px 0;
 --transition-fast: 0.18s ease;
 --transition-med: 0.28s ease;
}
* {
 box-sizing: border-box;
}
html {
 scroll-behavior: smooth;
 -webkit-font-smoothing: antialiased;
 -moz-osx-font-smoothing: grayscale;
}
body {
 font-family: var(--font-body);
 background-color: var(--bg-primary);
 color: var(--text-primary);
 line-height: 1.7;
 font-size: 16px;
 min-height: 100vh;
 overflow-x: hidden;
 margin: 0;
}
img {
 max-width: 100%;
 height: auto;
 display: block;
}
a {
 color: var(--accent-cyan);
 text-decoration: none;
 transition: color var(--transition-fast);
}
a:hover {
 color: var(--accent-cyan-hover);
}
button {
 cursor: pointer;
 font-family: var(--font-body);
}
.container {
 max-width: 1280px;
 margin: 0 auto;
 padding: 0 28px;
}
@media (max-width: 640px) {
 .container {
  padding: 0 16px;
 }
}
/* Header */
.site-header {
 position: sticky;
 top: 0;
 z-index: 100;
 background: rgba(15, 17, 23, 0.93);
 backdrop-filter: blur(16px);
 -webkit-backdrop-filter: blur(16px);
 border-bottom: 1px solid var(--border-color);
}
.header-inner {
 display: flex;
 align-items: center;
 justify-content: space-between;
 padding: 12px 0;
 gap: 20px;
 flex-wrap: wrap;
}
.logo-block {
 display: flex;
 align-items: center;
 gap: 10px;
 flex-shrink: 0;
}
.logo-icon {
 width: 38px;
 height: 38px;
 border-radius: 10px;
 background: linear-gradient(135deg, var(--accent-cyan-dim), var(--accent-cyan));
 display: flex;
 align-items: center;
 justify-content: center;
 font-weight: 700;
 font-size: 18px;
 color: var(--bg-primary);
 letter-spacing: -0.5px;
}
.logo-text {
 font-size: 20px;
 font-weight: 700;
 letter-spacing: 0.5px;
 color: var(--text-primary);
}
.logo-text:hover {
 color: var(--text-primary);
}
.header-search {
 flex: 1;
 max-width: 360px;
 min-width: 180px;
 position: relative;
}
.header-search input {
 width: 100%;
 background: var(--bg-secondary);
 border: 1px solid var(--border-color);
 border-radius: 10px;
 padding: 10px 14px 10px 40px;
 color: var(--text-primary);
 font-size: 14px;
 transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
 height: 42px;
}
.header-search input::placeholder {
 color: var(--text-muted);
}
.header-search input:focus {
 outline: none;
 border-color: var(--accent-cyan);
 box-shadow: 0 0 0 2px var(--accent-cyan-dim);
}
.header-search .fa-magnifying-glass {
 position: absolute;
 left: 14px;
 top: 50%;
 transform: translateY(-50%);
 color: var(--text-muted);
 font-size: 14px;
 pointer-events: none;
}
.header-right {
 display: flex;
 align-items: center;
 gap: 12px;
 flex-shrink: 0;
}
.version-badge {
 background: var(--bg-card);
 border: 1px solid var(--border-color);
 border-radius: 8px;
 padding: 6px 14px;
 font-size: 13px;
 color: var(--text-secondary);
 white-space: nowrap;
}
.version-badge .fa-chevron-down {
 margin-left: 6px;
 font-size: 10px;
}
.btn-subscribe-top {
 background: var(--accent-cyan);
 color: var(--bg-primary);
 border: none;
 border-radius: 8px;
 padding: 8px 16px;
 font-size: 14px;
 font-weight: 600;
 transition: background var(--transition-fast), transform var(--transition-fast);
 white-space: nowrap;
}
.btn-subscribe-top:hover {
 background: var(--accent-cyan-hover);
 transform: translateY(-1px);
}
.btn-subscribe-top:focus {
 outline: 2px solid var(--accent-cyan);
 outline-offset: 2px;
}
/* Main nav */
.main-nav {
 background: rgba(20, 22, 31, 0.9);
 border-bottom: 1px solid var(--border-color);
}
.main-nav .container {
 padding: 0;
}
.nav-list {
 list-style: none;
 display: flex;
 align-items: center;
 margin: 0;
 padding: 0;
 flex-wrap: wrap;
}
.nav-list li {
 margin: 0;
}
.nav-list a {
 display: block;
 padding: 12px 18px;
 color: var(--text-secondary);
 font-size: 14px;
 font-weight: 500;
 border-bottom: 2px solid transparent;
 transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}
.nav-list a:hover {
 color: var(--text-primary);
 background: var(--bg-card);
}
.nav-list a.active {
 color: var(--accent-cyan);
 border-bottom-color: var(--accent-cyan);
 background: rgba(62, 230, 200, 0.05);
}
/* Breadcrumb */
.breadcrumb-bar {
 background: var(--bg-secondary);
 border-bottom: 1px solid var(--border-color);
 padding: 14px 0;
 font-size: 13px;
 color: var(--text-muted);
}
.breadcrumb-bar a {
 color: var(--text-secondary);
}
.breadcrumb-bar a:hover {
 color: var(--accent-cyan);
}
.breadcrumb-divider {
 margin: 0 8px;
 color: var(--border-light);
}
.breadcrumb-current {
 color: var(--accent-cyan);
}
/* Page intro */
.page-intro {
 position: relative;
 padding: 56px 0 48px;
 background: var(--bg-primary);
 border-bottom: 1px solid var(--border-color);
 overflow: hidden;
}
.page-intro::before {
 content: "";
 position: absolute;
 inset: 0;
 background: url('/assets/images/34e00e8626eb8dd2.webp') center/cover no-repeat;
 opacity: 0.2;
 pointer-events: none;
 z-index: 0;
}
.page-intro::after {
 content: "";
 position: absolute;
 inset: 0;
 background: linear-gradient(180deg, rgba(15,17,23,0.75) 0%, rgba(15,17,23,0.92) 100%);
 z-index: 0;
}
.page-intro .container {
 position: relative;
 z-index: 1;
}
.page-intro h1 {
 font-size: 36px;
 margin: 0 0 14px;
 line-height: 1.25;
 font-weight: 700;
 color: var(--text-primary);
 letter-spacing: -0.5px;
}
.page-intro .intro-desc {
 font-size: 16px;
 color: var(--text-secondary);
 max-width: 780px;
 margin: 0;
 line-height: 1.8;
}
.intro-meta {
 display: flex;
 flex-wrap: wrap;
 gap: 18px;
 margin-top: 18px;
 font-size: 13px;
 color: var(--text-muted);
}
.intro-meta span {
 display: flex;
 align-items: center;
 gap: 6px;
}
.intro-meta i {
 color: var(--accent-cyan);
 font-size: 13px;
}
/* Layout with sidebar */
.content-layout {
 display: flex;
 gap: 28px;
 padding: 48px 0 64px;
 align-items: flex-start;
}
.sidebar-doc {
 width: 250px;
 flex-shrink: 0;
 position: sticky;
 top: 130px;
 background: var(--bg-secondary);
 border: 1px solid var(--border-color);
 border-radius: var(--radius-md);
 padding: 18px 14px;
 max-height: calc(100vh - 160px);
 overflow-y: auto;
}
.sidebar-doc h4 {
 font-size: 14px;
 margin: 0 0 12px;
 color: var(--text-primary);
 letter-spacing: 0.3px;
}
.sidebar-doc ul {
 list-style: none;
 margin: 0;
 padding: 0;
}
.sidebar-doc li {
 margin-bottom: 4px;
}
.sidebar-doc a {
 display: block;
 padding: 8px 12px;
 font-size: 14px;
 color: var(--text-secondary);
 border-radius: 6px;
 border-left: 2px solid transparent;
 transition: all var(--transition-fast);
}
.sidebar-doc a:hover {
 background: var(--bg-tertiary);
 color: var(--text-primary);
 border-left-color: var(--accent-cyan);
}
.sidebar-doc a.current {
 background: var(--accent-cyan-dim);
 color: var(--accent-cyan);
 border-left-color: var(--accent-cyan);
 font-weight: 500;
}
.main-content {
 flex: 1;
 min-width: 0;
}
/* Section common */
.section-block {
 margin-bottom: 40px;
}
.section-heading {
 margin-bottom: 20px;
}
.section-heading h2 {
 font-size: 24px;
 margin: 0 0 6px;
 line-height: 1.3;
}
.section-heading p {
 margin: 0;
 color: var(--text-secondary);
 font-size: 15px;
}
/* Card grid */
.rule-card-grid {
 display: grid;
 grid-template-columns: repeat(2, 1fr);
 gap: 20px;
}
.rule-card {
 background: var(--bg-card);
 border: 1px solid var(--border-color);
 border-radius: var(--radius-md);
 overflow: hidden;
 transition: all var(--transition-med);
 box-shadow: var(--shadow-card);
}
.rule-card:hover {
 transform: translateY(-3px);
 border-color: var(--border-light);
 box-shadow: var(--shadow-hover);
}
.rule-card-media {
 aspect-ratio: 16/9;
 overflow: hidden;
 background: var(--bg-tertiary);
}
.rule-card-media img {
 width: 100%;
 height: 100%;
 object-fit: cover;
 transition: transform var(--transition-med);
}
.rule-card:hover .rule-card-media img {
 transform: scale(1.03);
}
.rule-card-body {
 padding: 18px 20px 20px;
}
.rule-card-badge {
 display: inline-block;
 background: var(--accent-cyan-dim);
 color: var(--accent-cyan);
 font-size: 12px;
 font-weight: 600;
 padding: 4px 12px;
 border-radius: 999px;
 margin-bottom: 12px;
}
.rule-card h3 {
 font-size: 18px;
 margin: 0 0 8px;
 line-height: 1.4;
}
.rule-card p {
 font-size: 14px;
 color: var(--text-secondary);
 margin: 0 0 14px;
 line-height: 1.7;
}
.rule-card-link {
 font-size: 14px;
 font-weight: 500;
 color: var(--accent-cyan);
 display: inline-flex;
 align-items: center;
 gap: 6px;
}
.rule-card-link .fa-arrow-right {
 font-size: 12px;
 transition: transform var(--transition-fast);
}
.rule-card-link:hover .fa-arrow-right {
 transform: translateX(3px);
}
/* Rule list */
.rule-list {
 display: flex;
 flex-direction: column;
 gap: 14px;
}
.rule-list-item {
 background: var(--bg-card);
 border: 1px solid var(--border-color);
 border-radius: var(--radius-md);
 padding: 16px 20px;
 display: flex;
 gap: 16px;
 align-items: flex-start;
 transition: all var(--transition-fast);
}
.rule-list-item:hover {
 border-color: var(--border-light);
 background: var(--bg-tertiary);
}
.rule-list-num {
 font-family: var(--font-mono);
 width: 36px;
 height: 36px;
 flex-shrink: 0;
 background: var(--accent-cyan-dim);
 color: var(--accent-cyan);
 border-radius: 8px;
 display: flex;
 align-items: center;
 justify-content: center;
 font-size: 14px;
 font-weight: 700;
}
.rule-list-item h3 {
 font-size: 16px;
 margin: 0 0 4px;
}
.rule-list-item p {
 margin: 0;
 font-size: 14px;
 color: var(--text-secondary);
}
/* Comparison custom */
.comparison-grid {
 display: grid;
 grid-template-columns: repeat(2, 1fr);
 gap: 20px;
}
.compare-card {
 background: var(--bg-card);
 border: 1px solid var(--border-color);
 border-radius: var(--radius-md);
 padding: 22px;
 transition: all var(--transition-fast);
}
.compare-card.highlight {
 border-color: rgba(62, 230, 200, 0.4);
 background: linear-gradient(135deg, rgba(62,230,200,0.08), rgba(28,31,46,0.9));
}
.compare-card h3 {
 font-size: 17px;
 margin: 0 0 14px;
 display: flex;
 align-items: center;
 gap: 8px;
}
.compare-card h3 i {
 color: var(--accent-cyan);
 font-size: 15px;
}
.compare-row {
 display: flex;
 flex-direction: column;
 gap: 12px;
}
.compare-item {
 display: flex;
 align-items: center;
 justify-content: space-between;
 font-size: 14px;
 padding-bottom: 8px;
 border-bottom: 1px solid var(--border-color);
}
.compare-item:last-child {
 border-bottom: none;
 padding-bottom: 0;
}
.compare-label {
 color: var(--text-secondary);
}
.compare-value {
 font-family: var(--font-mono);
 font-weight: 600;
 color: var(--text-primary);
}
.compare-value.cyan {
 color: var(--accent-cyan);
}
.compare-value.amber {
 color: var(--accent-amber);
}
/* Myth cards */
.myth-grid {
 display: grid;
 grid-template-columns: repeat(3, 1fr);
 gap: 16px;
}
.myth-card {
 background: var(--bg-card);
 border: 1px solid var(--border-color);
 border-radius: var(--radius-md);
 padding: 18px;
 transition: all var(--transition-fast);
}
.myth-card:hover {
 border-color: rgba(213, 160, 74, 0.5);
}
.myth-card .myth-icon {
 width: 34px;
 height: 34px;
 border-radius: 8px;
 background: var(--accent-amber-dim);
 color: var(--accent-amber);
 display: flex;
 align-items: center;
 justify-content: center;
 margin-bottom: 10px;
}
.myth-card h3 {
 font-size: 15px;
 margin: 0 0 6px;
}
.myth-card p {
 margin: 0;
 font-size: 13px;
 color: var(--text-secondary);
 line-height: 1.6;
}
/* Data snapshot */
.snapshot-bar {
 background: var(--bg-secondary);
 border: 1px solid var(--border-color);
 border-radius: var(--radius-md);
 padding: 18px 20px;
 display: flex;
 flex-wrap: wrap;
 gap: 20px;
 align-items: center;
}
.snapshot-item {
 flex: 1;
 min-width: 130px;
}
.snapshot-label {
 font-size: 12px;
 color: var(--text-muted);
 margin-bottom: 4px;
}
.snapshot-value {
 font-family: var(--font-mono);
 font-size: 18px;
 font-weight: 700;
 color: var(--accent-cyan);
}
.snapshot-note {
 font-size: 12px;
 color: var(--text-muted);
 margin-left: 6px;
}
/* FAQ */
.faq-list {
 display: flex;
 flex-direction: column;
 gap: 12px;
}
.faq-item {
 border: 1px solid var(--border-color);
 border-radius: var(--radius-md);
 background: var(--bg-card);
 overflow: hidden;
}
.faq-question {
 display: flex;
 align-items: center;
 justify-content: space-between;
 padding: 16px 20px;
 cursor: pointer;
 font-size: 15px;
 font-weight: 500;
 color: var(--text-primary);
 transition: background var(--transition-fast);
}
.faq-question:hover {
 background: var(--bg-tertiary);
}
.faq-question .faq-icon {
 color: var(--accent-cyan);
 font-size: 14px;
 transition: transform var(--transition-fast);
}
.faq-item.open .faq-icon {
 transform: rotate(180deg);
}
.faq-answer {
 padding: 0 20px 18px;
 font-size: 14px;
 color: var(--text-secondary);
 line-height: 1.7;
 display: none;
}
.faq-item.open .faq-answer {
 display: block;
}
/* CTA */
.cta-band {
 background: var(--bg-secondary);
 border: 1px solid var(--border-color);
 border-radius: var(--radius-lg);
 padding: 36px 32px;
 display: flex;
 align-items: center;
 justify-content: space-between;
 gap: 20px;
 flex-wrap: wrap;
}
.cta-band h3 {
 font-size: 20px;
 margin: 0 0 6px;
}
.cta-band p {
 margin: 0;
 color: var(--text-secondary);
 font-size: 14px;
}
.btn-primary {
 display: inline-flex;
 align-items: center;
 gap: 8px;
 background: var(--accent-cyan);
 color: var(--bg-primary);
 border: none;
 border-radius: 8px;
 padding: 12px 22px;
 font-size: 15px;
 font-weight: 600;
 transition: all var(--transition-fast);
}
.btn-primary:hover {
 background: var(--accent-cyan-hover);
 transform: translateY(-1px);
}
.btn-primary:focus {
 outline: 2px solid var(--accent-cyan);
 outline-offset: 2px;
}
.btn-secondary {
 display: inline-flex;
 align-items: center;
 gap: 8px;
 background: transparent;
 color: var(--accent-cyan);
 border: 1px solid var(--accent-cyan);
 border-radius: 8px;
 padding: 11px 20px;
 font-size: 15px;
 font-weight: 600;
 transition: all var(--transition-fast);
}
.btn-secondary:hover {
 background: rgba(62, 230, 200, 0.1);
 color: var(--accent-cyan-hover);
}
/* Footer */
.site-footer {
 background: var(--bg-secondary);
 border-top: 1px solid var(--border-color);
 padding: 48px 0 24px;
 margin-top: 24px;
}
.footer-inner {
 display: grid;
 grid-template-columns: 1.4fr 1fr 1fr 1fr;
 gap: 32px;
 margin-bottom: 32px;
}
.footer-brand p {
 font-size: 14px;
 color: var(--text-secondary);
 margin-top: 12px;
 line-height: 1.7;
}
.footer-col h4 {
 font-size: 15px;
 margin: 0 0 14px;
 color: var(--text-primary);
}
.footer-col ul {
 list-style: none;
 margin: 0;
 padding: 0;
}
.footer-col li {
 margin-bottom: 8px;
}
.footer-col a {
 color: var(--text-secondary);
 font-size: 14px;
 transition: color var(--transition-fast);
}
.footer-col a:hover {
 color: var(--accent-cyan);
}
.footer-bottom {
 border-top: 1px solid var(--border-color);
 padding-top: 18px;
 display: flex;
 flex-wrap: wrap;
 gap: 8px 24px;
 font-size: 12px;
 color: var(--text-muted);
 align-items: center;
}
.footer-bottom p {
 margin: 0;
}
.footer-bottom a {
 color: var(--text-secondary);
}
.footer-bottom a:hover {
 color: var(--accent-cyan);
}
/* Mobile toggles */
.mobile-nav-toggle {
 display: none;
 background: transparent;
 border: 1px solid var(--border-color);
 border-radius: 6px;
 padding: 8px 10px;
 color: var(--text-primary);
 font-size: 16px;
}
/* Responsive */
@media (max-width: 1024px) {
 .content-layout {
  gap: 18px;
 }
 .sidebar-doc {
  width: 220px;
 }
 .myth-grid {
  grid-template-columns: repeat(2, 1fr);
 }
}
@media (max-width: 768px) {
 .site-header .btn-subscribe-top {
  display: none;
 }
 .header-inner {
  gap: 12px;
 }
 .content-layout {
  flex-direction: column;
  padding: 36px 0 48px;
 }
 .sidebar-doc {
  width: 100%;
  position: static;
  max-height: none;
  overflow: hidden;
 }
 .sidebar-doc ul {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: 4px;
 }
 .sidebar-doc li {
  flex-shrink: 0;
  margin-bottom: 0;
 }
 .sidebar-doc a {
  white-space: nowrap;
  padding: 7px 12px;
 }
 .rule-card-grid {
  grid-template-columns: 1fr;
 }
 .comparison-grid {
  grid-template-columns: 1fr;
 }
 .myth-grid {
  grid-template-columns: 1fr;
 }
 .cta-band {
  flex-direction: column;
  align-items: flex-start;
 }
 .footer-inner {
  grid-template-columns: 1fr 1fr;
  gap: 24px;
 }
 .page-intro h1 {
  font-size: 28px;
 }
 .nav-list {
  flex-wrap: nowrap;
  overflow-x: auto;
  white-space: nowrap;
  scrollbar-width: none;
 }
 .nav-list::-webkit-scrollbar {
  display: none;
 }
 .nav-list a {
  padding: 12px 14px;
 }
 .mobile-nav-toggle {
  display: block;
 }
}
@media (max-width: 520px) {
 .header-search {
  max-width: none;
  flex-basis: 100%;
  order: 3;
 }
 .header-right {
  margin-left: auto;
 }
 .footer-inner {
  grid-template-columns: 1fr;
  gap: 18px;
 }
 .footer-bottom {
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
 }
 .page-intro {
  padding: 40px 0 36px;
 }
 .snapshot-bar {
  flex-direction: column;
  gap: 14px;
 }
}

/* roulang page: category4 */
:root {
            --bg-primary: #0f1117;
            --bg-secondary: #151824;
            --bg-tertiary: #1c1f2e;
            --bg-card: rgba(28, 31, 46, 0.85);
            --text-primary: #f0f2f7;
            --text-secondary: #9aa3b8;
            --text-muted: #6b7280;
            --accent-cyan: #3ee6c8;
            --accent-cyan-hover: #5ff0d6;
            --accent-cyan-dim: rgba(62, 230, 200, 0.12);
            --accent-amber: #d5a04a;
            --accent-amber-hover: #e8b860;
            --accent-amber-dim: rgba(213, 160, 74, 0.14);
            --border-color: #2a2e3f;
            --border-light: #353a50;
            --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.35);
            --shadow-hover: 0 8px 32px rgba(0, 0, 0, 0.5);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 18px;
            --radius-xl: 24px;
            --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans CJK SC', system-ui, sans-serif;
            --font-mono: 'Roboto Mono', 'JetBrains Mono', 'Courier New', monospace;
            --section-padding: 72px 0;
            --section-padding-mobile: 48px 0;
            --transition-fast: 0.18s ease;
            --transition-med: 0.28s ease;
        }

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

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

        body {
            font-family: var(--font-body);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.7;
            font-size: 16px;
            min-height: 100vh;
            overflow-x: hidden;
            margin: 0;
            padding: 0;
        }

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

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

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

        button {
            cursor: pointer;
            font-family: var(--font-body);
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 28px;
        }

        /* ========== Header ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(15, 17, 23, 0.93);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-color);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 12px 0;
            gap: 20px;
            flex-wrap: wrap;
        }

        .logo-block {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--accent-cyan-dim), var(--accent-cyan));
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 18px;
            color: var(--bg-primary);
            letter-spacing: -0.5px;
        }

        .logo-text {
            font-size: 20px;
            font-weight: 700;
            letter-spacing: 0.5px;
            color: var(--text-primary);
        }

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

        .header-search {
            flex: 1;
            max-width: 360px;
            min-width: 180px;
            position: relative;
        }

        .header-search input {
            width: 100%;
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: 10px;
            padding: 10px 14px 10px 40px;
            color: var(--text-primary);
            font-size: 14px;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
            height: 42px;
            font-family: var(--font-body);
        }

        .header-search input::placeholder {
            color: var(--text-muted);
        }

        .header-search input:focus {
            outline: none;
            border-color: var(--accent-cyan);
            box-shadow: 0 0 0 2px var(--accent-cyan-dim);
        }

        .header-search .fa-magnifying-glass {
            position: absolute;
            left: 14px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--text-muted);
            font-size: 14px;
            pointer-events: none;
        }

        .header-right {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }

        .version-badge {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            padding: 6px 14px;
            font-size: 13px;
            color: var(--text-secondary);
            white-space: nowrap;
        }

        .version-badge .fa-chevron-down {
            margin-left: 6px;
            font-size: 10px;
        }

        .btn-subscribe-top {
            background: var(--accent-cyan);
            color: var(--bg-primary);
            border: none;
            border-radius: var(--radius-sm);
            padding: 8px 16px;
            font-size: 14px;
            font-weight: 600;
            transition: background var(--transition-fast), transform var(--transition-fast);
            white-space: nowrap;
            text-decoration: none;
            display: inline-block;
        }

        .btn-subscribe-top:hover {
            background: var(--accent-cyan-hover);
            transform: translateY(-1px);
            color: var(--bg-primary);
        }

        .btn-subscribe-top:focus {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }

        /* Main Nav */
        .main-nav {
            border-top: 1px solid var(--border-color);
            background: rgba(15, 17, 23, 0.9);
        }

        .main-nav .container {
            padding-top: 0;
            padding-bottom: 0;
        }

        .nav-list {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            align-items: center;
            gap: 4px;
            flex-wrap: wrap;
        }

        .nav-list li {
            margin: 0;
        }

        .nav-list a {
            display: block;
            padding: 12px 18px;
            color: var(--text-secondary);
            font-size: 14px;
            font-weight: 500;
            border-bottom: 2px solid transparent;
            transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
            text-decoration: none;
        }

        .nav-list a:hover {
            color: var(--text-primary);
            background: rgba(62, 230, 200, 0.05);
        }

        .nav-list a.active {
            color: var(--accent-cyan);
            border-bottom-color: var(--accent-cyan);
        }

        /* Mobile nav toggle */
        .nav-toggle {
            display: none;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            color: var(--text-primary);
            padding: 10px 14px;
            font-size: 16px;
            line-height: 1;
        }

        .nav-toggle:focus {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }

        /* ========== Breadcrumb ========== */
        .breadcrumb-section {
            padding: 20px 0 0;
            background: var(--bg-primary);
        }

        .breadcrumb {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 14px;
            color: var(--text-muted);
        }

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

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

        .breadcrumb a {
            color: var(--text-secondary);
            text-decoration: none;
            transition: color var(--transition-fast);
        }

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

        .breadcrumb .current {
            color: var(--accent-cyan);
            font-weight: 500;
        }

        /* ========== Category Page Layout ========== */
        .category-main {
            padding: 32px 0 64px;
            background: var(--bg-primary);
        }

        .category-layout {
            display: grid;
            grid-template-columns: 260px 1fr;
            gap: 36px;
            align-items: start;
        }

        /* Sidebar */
        .sidebar-nav {
            position: sticky;
            top: 100px;
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 20px 16px;
            max-height: calc(100vh - 140px);
            overflow-y: auto;
        }

        .sidebar-title {
            font-size: 13px;
            font-weight: 600;
            color: var(--text-muted);
            text-transform: uppercase;
            letter-spacing: 1px;
            margin: 0 0 14px;
            padding-bottom: 10px;
            border-bottom: 1px solid var(--border-color);
        }

        .sidebar-nav ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .sidebar-nav li {
            margin: 0;
        }

        .sidebar-nav a {
            display: block;
            padding: 8px 12px;
            border-left: 3px solid transparent;
            color: var(--text-secondary);
            font-size: 14px;
            text-decoration: none;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
        }

        .sidebar-nav a:hover {
            color: var(--text-primary);
            background: rgba(62, 230, 200, 0.06);
            border-left-color: var(--accent-cyan);
        }

        .sidebar-nav a.active {
            color: var(--accent-cyan);
            border-left-color: var(--accent-cyan);
            background: rgba(62, 230, 200, 0.08);
        }

        /* ========== Category Hero ========== */
        .category-hero {
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-xl);
            padding: 36px 32px;
            margin-bottom: 32px;
            position: relative;
            overflow: hidden;
        }

        .category-hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--accent-cyan), transparent);
        }

        .category-hero .badge-row {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            margin-bottom: 14px;
        }

        .badge-item {
            display: inline-block;
            padding: 4px 12px;
            background: var(--accent-cyan-dim);
            color: var(--accent-cyan);
            border: 1px solid rgba(62, 230, 200, 0.2);
            border-radius: 20px;
            font-size: 12px;
            font-weight: 500;
        }

        .badge-item.amber {
            background: var(--accent-amber-dim);
            color: var(--accent-amber);
            border-color: rgba(213, 160, 74, 0.25);
        }

        .category-hero h1 {
            font-size: 32px;
            font-weight: 700;
            line-height: 1.3;
            color: var(--text-primary);
            margin: 0 0 16px;
            letter-spacing: -0.3px;
        }

        .category-hero .hero-desc {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
            max-width: 720px;
            margin: 0 0 18px;
        }

        .hero-meta {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
            font-size: 13px;
            color: var(--text-muted);
        }

        .hero-meta .meta-item {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .hero-meta .fa {
            color: var(--accent-cyan);
        }

        /* ========== Review Cards Grid ========== */
        .review-section {
            margin-bottom: 48px;
        }

        .section-heading-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 24px;
            flex-wrap: wrap;
            gap: 12px;
        }

        .section-heading-row h2 {
            font-size: 24px;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0;
            letter-spacing: -0.2px;
        }

        .section-heading-row .section-sub {
            font-size: 14px;
            color: var(--text-muted);
        }

        .review-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .review-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: transform var(--transition-med), box-shadow var(--transition-med), border-color var(--transition-med);
            display: flex;
            flex-direction: column;
        }

        .review-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: var(--border-light);
        }

        .review-card .card-thumb {
            aspect-ratio: 16 / 9;
            overflow: hidden;
            background: var(--bg-tertiary);
            position: relative;
        }

        .review-card .card-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-med);
        }

        .review-card:hover .card-thumb img {
            transform: scale(1.04);
        }

        .review-card .card-body {
            padding: 18px 18px 16px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .review-card .card-tag {
            display: inline-block;
            font-size: 11px;
            font-weight: 600;
            padding: 3px 10px;
            border-radius: 4px;
            background: var(--accent-cyan-dim);
            color: var(--accent-cyan);
            margin-bottom: 10px;
            align-self: flex-start;
        }

        .review-card .card-tag.amber {
            background: var(--accent-amber-dim);
            color: var(--accent-amber);
        }

        .review-card h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            margin: 0 0 8px;
            line-height: 1.5;
        }

        .review-card .card-excerpt {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin: 0 0 12px;
            flex: 1;
        }

        .review-card .card-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 12px;
            color: var(--text-muted);
            padding-top: 12px;
            border-top: 1px solid var(--border-color);
        }

        .review-card .card-meta .date {
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .review-card .card-meta .read-link {
            font-size: 12px;
            color: var(--accent-cyan);
            font-weight: 500;
            text-decoration: none;
            transition: color var(--transition-fast);
        }

        .review-card .card-meta .read-link:hover {
            color: var(--accent-cyan-hover);
        }

        /* View more button */
        .view-more-wrapper {
            text-align: center;
            margin-top: 28px;
        }

        .btn-view-more {
            display: inline-block;
            background: transparent;
            border: 1px solid var(--border-light);
            color: var(--text-secondary);
            border-radius: var(--radius-md);
            padding: 12px 28px;
            font-size: 14px;
            font-weight: 600;
            text-decoration: none;
            transition: all var(--transition-fast);
        }

        .btn-view-more:hover {
            background: var(--bg-card);
            color: var(--text-primary);
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
        }

        .btn-view-more:focus {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }

        /* ========== Support Sections ========== */
        .support-section {
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            margin-bottom: 24px;
        }

        .support-section h2 {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0 0 16px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .support-section h2 .fa {
            color: var(--accent-cyan);
            font-size: 18px;
        }

        .support-section .support-content {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        .support-section .support-content p {
            margin: 0 0 12px;
        }

        .support-section .support-content p:last-child {
            margin-bottom: 0;
        }

        /* Tag cloud */
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .tag-cloud .tag-link {
            display: inline-block;
            padding: 6px 14px;
            background: var(--bg-tertiary);
            border: 1px solid var(--border-color);
            border-radius: 20px;
            font-size: 12px;
            color: var(--text-secondary);
            text-decoration: none;
            transition: all var(--transition-fast);
        }

        .tag-cloud .tag-link:hover {
            background: var(--accent-cyan-dim);
            color: var(--accent-cyan);
            border-color: rgba(62, 230, 200, 0.3);
        }

        /* Risk list */
        .risk-list {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .risk-list li {
            padding: 10px 0;
            border-bottom: 1px solid var(--border-color);
            font-size: 14px;
            color: var(--text-secondary);
            display: flex;
            align-items: flex-start;
            gap: 10px;
        }

        .risk-list li:last-child {
            border-bottom: none;
        }

        .risk-list .fa {
            color: var(--accent-amber);
            font-size: 14px;
            margin-top: 3px;
            flex-shrink: 0;
        }

        /* Data brief */
        .data-brief-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 14px;
        }

        .data-brief-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 16px;
            text-align: center;
        }

        .data-brief-item .db-value {
            font-family: var(--font-mono);
            font-size: 22px;
            font-weight: 700;
            color: var(--accent-cyan);
            display: block;
            line-height: 1.3;
        }

        .data-brief-item .db-label {
            font-size: 12px;
            color: var(--text-muted);
            margin-top: 4px;
        }

        /* ========== Subscribe CTA ========== */
        .subscribe-cta {
            background: linear-gradient(135deg, rgba(62, 230, 200, 0.08), rgba(213, 160, 74, 0.06));
            border: 1px solid rgba(62, 230, 200, 0.25);
            border-radius: var(--radius-xl);
            padding: 32px 28px;
            text-align: center;
            margin-top: 8px;
        }

        .subscribe-cta h2 {
            font-size: 22px;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0 0 10px;
        }

        .subscribe-cta p {
            font-size: 14px;
            color: var(--text-secondary);
            margin: 0 0 20px;
        }

        .subscribe-form {
            display: flex;
            gap: 10px;
            max-width: 480px;
            margin: 0 auto;
            flex-wrap: wrap;
            justify-content: center;
        }

        .subscribe-form input[type="email"],
        .subscribe-form input[type="text"] {
            flex: 1;
            min-width: 200px;
            background: var(--bg-primary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            padding: 12px 16px;
            color: var(--text-primary);
            font-size: 14px;
            font-family: var(--font-body);
            height: 46px;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
        }

        .subscribe-form input:focus {
            outline: none;
            border-color: var(--accent-cyan);
            box-shadow: 0 0 0 2px var(--accent-cyan-dim);
        }

        .subscribe-form .btn-submit {
            background: var(--accent-cyan);
            color: var(--bg-primary);
            border: none;
            border-radius: var(--radius-sm);
            padding: 12px 24px;
            font-size: 14px;
            font-weight: 600;
            transition: all var(--transition-fast);
            height: 46px;
            white-space: nowrap;
        }

        .subscribe-form .btn-submit:hover {
            background: var(--accent-cyan-hover);
            transform: translateY(-1px);
        }

        .subscribe-form .btn-submit:focus {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }

        .form-hint {
            font-size: 12px;
            color: var(--text-muted);
            margin-top: 12px;
        }

        /* ========== Footer ========== */
        .site-footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            padding-top: 48px;
            margin-top: 32px;
        }

        .footer-inner {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            padding-bottom: 36px;
            border-bottom: 1px solid var(--border-color);
        }

        .footer-brand .logo-block {
            margin-bottom: 14px;
        }

        .footer-brand p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin: 0;
        }

        .footer-col h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            margin: 0 0 14px;
        }

        .footer-col ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .footer-col li {
            margin-bottom: 8px;
        }

        .footer-col a {
            font-size: 14px;
            color: var(--text-secondary);
            text-decoration: none;
            transition: color var(--transition-fast);
        }

        .footer-col a:hover {
            color: var(--accent-cyan);
        }

        .footer-bottom {
            padding: 20px 0 32px;
            text-align: center;
            font-size: 13px;
            color: var(--text-muted);
            line-height: 2;
        }

        .footer-bottom p {
            margin: 0;
        }

        .footer-bottom a {
            color: var(--text-secondary);
            text-decoration: none;
            transition: color var(--transition-fast);
        }

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

        /* ========== Responsive ========== */
        @media (max-width: 1280px) {
            .container {
                padding: 0 20px;
            }

            .review-grid {
                grid-template-columns: repeat(3, 1fr);
                gap: 16px;
            }
        }

        @media (max-width: 1024px) {
            .category-layout {
                grid-template-columns: 1fr;
            }

            .sidebar-nav {
                position: static;
                max-height: none;
                overflow-y: visible;
                display: none;
            }

            .sidebar-nav.sidebar-open {
                display: block;
            }

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

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

            .footer-inner {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }

            .category-hero h1 {
                font-size: 28px;
            }
        }

        @media (max-width: 768px) {
            :root {
                --section-padding: 56px 0;
                --section-padding-mobile: 40px 0;
            }

            .header-inner {
                padding: 10px 0;
                gap: 12px;
            }

            .header-search {
                max-width: none;
                flex: 1;
                min-width: 120px;
            }

            .version-badge {
                display: none;
            }

            .nav-toggle {
                display: block;
            }

            .main-nav .nav-list {
                display: none;
                flex-direction: column;
                align-items: stretch;
                padding: 8px 0;
            }

            .main-nav .nav-list.nav-open {
                display: flex;
            }

            .nav-list a {
                padding: 10px 16px;
                border-bottom: 1px solid var(--border-color);
                border-left: none;
            }

            .nav-list a.active {
                border-left: 3px solid var(--accent-cyan);
                border-bottom-color: transparent;
                background: rgba(62, 230, 200, 0.06);
            }

            .category-main {
                padding: 20px 0 48px;
            }

            .category-hero {
                padding: 24px 18px;
            }

            .category-hero h1 {
                font-size: 24px;
            }

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

            .section-heading-row h2 {
                font-size: 20px;
            }

            .support-section {
                padding: 20px 16px;
            }

            .data-brief-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 10px;
            }

            .subscribe-form {
                flex-direction: column;
                align-items: stretch;
            }

            .subscribe-form input[type="email"],
            .subscribe-form input[type="text"] {
                min-width: auto;
                width: 100%;
            }

            .subscribe-form .btn-submit {
                width: 100%;
            }

            .footer-inner {
                grid-template-columns: 1fr;
                gap: 20px;
            }

            .footer-bottom {
                font-size: 12px;
                padding: 16px 0 24px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 14px;
            }

            .logo-text {
                font-size: 18px;
            }

            .logo-icon {
                width: 34px;
                height: 34px;
                font-size: 16px;
            }

            .btn-subscribe-top {
                padding: 6px 12px;
                font-size: 12px;
            }

            .category-hero h1 {
                font-size: 20px;
            }

            .category-hero .hero-desc {
                font-size: 14px;
            }

            .review-card h3 {
                font-size: 15px;
            }

            .data-brief-grid {
                grid-template-columns: 1fr 1fr;
            }

            .data-brief-item .db-value {
                font-size: 18px;
            }

            .breadcrumb {
                font-size: 12px;
            }

            .support-section h2 {
                font-size: 18px;
            }
        }