/* roulang page: index */
:root {
            --primary: #0066e0;
            --primary-hover: #0052b3;
            --primary-light: #e8f2ff;
            --accent: #f59e0b;
            --accent-glow: #fbbf24;
            --dark-bg: #080c14;
            --dark-card: #111827;
            --dark-card-border: #1f2937;
            --dark-text: #e5e7eb;
            --dark-text-muted: #9ca3af;
            --light-bg: #ffffff;
            --light-bg-alt: #f8fafc;
            --text: #111827;
            --text-secondary: #4b5563;
            --text-muted: #6b7280;
            --border: #e5e7eb;
            --border-light: #f3f4f6;
            --radius-sm: 8px;
            --radius: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow: 0 4px 24px rgba(0, 0, 0, 0.07), 0 1px 4px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.10), 0 4px 12px rgba(0, 0, 0, 0.05);
            --shadow-dark: 0 8px 32px rgba(0, 0, 0, 0.35);
            --sidebar-width: 250px;
            --transition-fast: 0.18s ease;
            --transition: 0.28s ease;
            --transition-slow: 0.4s ease;
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', 'Consolas', monospace;
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-tap-highlight-color: transparent;
        }

        body {
            margin: 0;
            padding: 0;
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.65;
            color: var(--text);
            background: var(--light-bg);
            display: flex;
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

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

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius);
        }

        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            outline: none;
            transition: all var(--transition-fast);
        }

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

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

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            margin: 0;
            font-weight: 700;
            line-height: 1.25;
        }

        p {
            margin: 0;
        }

        /* Sidebar */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--dark-bg);
            border-right: 1px solid var(--dark-card-border);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            overflow-y: auto;
            padding: 0;
            transition: transform var(--transition);
        }

        .sidebar-brand {
            padding: 24px 20px;
            border-bottom: 1px solid var(--dark-card-border);
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .sidebar-brand .logo-icon {
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--primary), #3b82f6);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 800;
            font-size: 18px;
            flex-shrink: 0;
        }

        .sidebar-brand .logo-text {
            font-size: 17px;
            font-weight: 700;
            color: #fff;
            letter-spacing: -0.3px;
            white-space: nowrap;
        }

        .sidebar-nav {
            flex: 1;
            padding: 16px 12px;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 14px;
            border-radius: var(--radius-sm);
            color: #c9cdd4;
            font-size: 15px;
            font-weight: 500;
            transition: all var(--transition-fast);
            position: relative;
        }

        .sidebar-nav a i {
            width: 20px;
            text-align: center;
            font-size: 15px;
        }

        .sidebar-nav a:hover {
            background: rgba(255, 255, 255, 0.05);
            color: #fff;
        }

        .sidebar-nav a.active {
            background: rgba(0, 102, 224, 0.18);
            color: #fff;
            font-weight: 600;
        }

        .sidebar-nav a.active::before {
            content: '';
            position: absolute;
            left: -12px;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 24px;
            background: var(--primary);
            border-radius: 0 3px 3px 0;
        }

        .sidebar-footer {
            padding: 16px 20px;
            border-top: 1px solid var(--dark-card-border);
            font-size: 12px;
            color: #6b7280;
        }

        /* Mobile Header */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 999;
            background: var(--dark-bg);
            border-bottom: 1px solid var(--dark-card-border);
            padding: 12px 16px;
            align-items: center;
            justify-content: space-between;
        }

        .mobile-header .logo-area {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .mobile-header .logo-icon {
            width: 34px;
            height: 34px;
            background: linear-gradient(135deg, var(--primary), #3b82f6);
            border-radius: 7px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 800;
            font-size: 15px;
        }

        .mobile-header .logo-text {
            font-size: 16px;
            font-weight: 700;
            color: #fff;
        }

        .hamburger-btn {
            background: none;
            border: none;
            color: #fff;
            font-size: 22px;
            padding: 6px 8px;
            border-radius: 6px;
            cursor: pointer;
        }

        .hamburger-btn:hover {
            background: rgba(255, 255, 255, 0.08);
        }

        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.6);
            z-index: 998;
            opacity: 0;
            transition: opacity var(--transition);
            pointer-events: none;
        }

        .sidebar-overlay.show {
            opacity: 1;
            pointer-events: auto;
        }

        /* Main Content */
        .main-content {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        /* Container */
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 28px;
        }
        .container-narrow {
            max-width: 960px;
        }

        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 13px 28px;
            font-size: 15px;
            font-weight: 600;
            border-radius: var(--radius);
            cursor: pointer;
            transition: all var(--transition-fast);
            border: none;
            white-space: nowrap;
            letter-spacing: 0.2px;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 16px rgba(0, 102, 224, 0.3);
        }
        .btn-primary:hover {
            background: var(--primary-hover);
            box-shadow: 0 6px 22px rgba(0, 102, 224, 0.4);
            transform: translateY(-1px);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(0, 102, 224, 0.25);
        }
        .btn-outline {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.5);
        }
        .btn-outline:hover {
            border-color: #fff;
            background: rgba(255, 255, 255, 0.06);
            transform: translateY(-1px);
        }
        .btn-accent {
            background: var(--accent);
            color: #0f172a;
            font-weight: 700;
            box-shadow: 0 4px 16px rgba(245, 158, 11, 0.35);
        }
        .btn-accent:hover {
            background: #e8960a;
            box-shadow: 0 6px 22px rgba(245, 158, 11, 0.45);
            transform: translateY(-1px);
        }
        .btn-lg {
            padding: 16px 36px;
            font-size: 17px;
            border-radius: var(--radius-lg);
        }
        .btn-sm {
            padding: 9px 18px;
            font-size: 13px;
            border-radius: var(--radius-sm);
        }

        /* Badge / Tag */
        .badge {
            display: inline-block;
            padding: 5px 12px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 0.3px;
            text-transform: uppercase;
        }
        .badge-primary {
            background: var(--primary-light);
            color: var(--primary);
        }
        .badge-accent {
            background: #fef3c7;
            color: #b45309;
        }
        .badge-dark {
            background: rgba(255, 255, 255, 0.1);
            color: #e5e7eb;
            border: 1px solid rgba(255, 255, 255, 0.2);
        }

        /* Hero Section */
        .hero {
            position: relative;
            background: var(--dark-bg);
            background-image:
                linear-gradient(180deg, rgba(8, 12, 20, 0.55) 0%, rgba(8, 12, 20, 0.85) 60%, rgba(8, 12, 20, 0.97) 100%),
                url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            padding: 100px 0 90px;
            color: #fff;
            overflow: hidden;
        }
        .hero::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15), transparent);
        }
        .hero-content {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }
        .hero-text h1 {
            font-size: 48px;
            font-weight: 800;
            line-height: 1.15;
            letter-spacing: -1px;
            margin-bottom: 18px;
        }
        .hero-text h1 .highlight {
            background: linear-gradient(135deg, #60a5fa, #a78bfa);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-text p {
            font-size: 18px;
            color: #c9cdd4;
            line-height: 1.7;
            margin-bottom: 32px;
            max-width: 480px;
        }
        .hero-buttons {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
        }
        .hero-metrics {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }
        .metric-card {
            background: var(--dark-card);
            border: 1px solid var(--dark-card-border);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            text-align: center;
            transition: all var(--transition);
        }
        .metric-card:hover {
            border-color: rgba(255, 255, 255, 0.3);
            box-shadow: var(--shadow-dark);
            transform: translateY(-3px);
        }
        .metric-card .metric-value {
            font-size: 40px;
            font-weight: 800;
            letter-spacing: -1px;
            background: linear-gradient(180deg, #fbbf24, #f59e0b);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 6px;
            font-family: var(--font-mono);
        }
        .metric-card .metric-label {
            font-size: 13px;
            color: #9ca3af;
            letter-spacing: 0.5px;
        }

        /* Section Common */
        .section {
            padding: 80px 0;
        }
        .section-dark {
            background: var(--dark-bg);
            color: #fff;
        }
        .section-alt {
            background: var(--light-bg-alt);
        }
        .section-header {
            text-align: center;
            margin-bottom: 50px;
        }
        .section-header h2 {
            font-size: 34px;
            font-weight: 800;
            margin-bottom: 12px;
            letter-spacing: -0.5px;
        }
        .section-header p {
            font-size: 16px;
            color: var(--text-muted);
            max-width: 600px;
            margin: 0 auto;
        }
        .section-dark .section-header p {
            color: #9ca3af;
        }

        /* Stats Bar */
        .stats-bar {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 0;
            border-radius: var(--radius-xl);
            overflow: hidden;
            background: var(--dark-card);
            border: 1px solid var(--dark-card-border);
        }
        .stat-item {
            padding: 30px 24px;
            text-align: center;
            border-right: 1px solid var(--dark-card-border);
            transition: background var(--transition-fast);
        }
        .stat-item:last-child {
            border-right: none;
        }
        .stat-item:hover {
            background: rgba(255, 255, 255, 0.03);
        }
        .stat-item .stat-num {
            font-size: 38px;
            font-weight: 800;
            font-family: var(--font-mono);
            color: #fbbf24;
            letter-spacing: -1px;
            margin-bottom: 6px;
        }
        .stat-item .stat-desc {
            font-size: 13px;
            color: #9ca3af;
        }

        /* Service Cards */
        .cards-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
        }
        .card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
            border-color: #d1d5db;
        }
        .card-image {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-radius: 0;
        }
        .card-body {
            padding: 24px 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .card-body h3 {
            font-size: 19px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text);
        }
        .card-body p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
            margin-bottom: 16px;
            flex: 1;
        }
        .card-body .card-link {
            font-weight: 600;
            font-size: 14px;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: gap var(--transition-fast);
        }
        .card-body .card-link:hover {
            gap: 10px;
            color: var(--primary-hover);
        }

        /* Advantage Section */
        .advantage-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }
        .advantage-image img {
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow-lg);
        }
        .advantage-list {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        .advantage-item {
            display: flex;
            gap: 16px;
            align-items: flex-start;
            padding: 18px;
            border-radius: var(--radius);
            background: #fff;
            border: 1px solid var(--border-light);
            transition: all var(--transition-fast);
        }
        .advantage-item:hover {
            box-shadow: var(--shadow);
            border-color: #d1d5db;
        }
        .advantage-item .adv-icon {
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 18px;
            flex-shrink: 0;
        }
        .advantage-item .adv-text h4 {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 4px;
            color: var(--text);
        }
        .advantage-item .adv-text p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.5;
        }

        /* Category Entrance */
        .category-card {
            position: relative;
            border-radius: var(--radius-xl);
            overflow: hidden;
            background: var(--dark-card);
            border: 1px solid var(--dark-card-border);
            display: flex;
            align-items: center;
            gap: 32px;
            padding: 0;
            transition: all var(--transition);
            cursor: pointer;
            text-decoration: none;
            color: inherit;
        }
        .category-card:hover {
            box-shadow: var(--shadow-dark);
            border-color: rgba(255, 255, 255, 0.3);
            transform: translateY(-3px);
        }
        .category-card .cat-img {
            width: 280px;
            height: 220px;
            object-fit: cover;
            border-radius: 0;
            flex-shrink: 0;
        }
        .category-card .cat-body {
            padding: 28px 20px 28px 0;
            flex: 1;
        }
        .category-card .cat-body .badge {
            margin-bottom: 10px;
        }
        .category-card .cat-body h3 {
            font-size: 24px;
            font-weight: 800;
            margin-bottom: 8px;
            color: #fff;
        }
        .category-card .cat-body p {
            font-size: 15px;
            color: #9ca3af;
            line-height: 1.6;
            margin-bottom: 16px;
        }

        /* CMS News List */
        .news-list {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }
        .news-item {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 22px 20px;
            transition: all var(--transition-fast);
            display: flex;
            flex-direction: column;
            gap: 8px;
            box-shadow: var(--shadow-sm);
        }
        .news-item:hover {
            box-shadow: var(--shadow);
            border-color: #d1d5db;
            transform: translateY(-2px);
        }
        .news-item .news-meta {
            display: flex;
            gap: 12px;
            align-items: center;
            font-size: 12px;
            color: var(--text-muted);
        }
        .news-item h4 {
            font-size: 16px;
            font-weight: 700;
            line-height: 1.4;
            color: var(--text);
        }
        .news-item h4 a {
            color: inherit;
            transition: color var(--transition-fast);
        }
        .news-item h4 a:hover {
            color: var(--primary);
        }
        .news-item .news-excerpt {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.55;
        }
        .news-empty {
            text-align: center;
            padding: 40px;
            color: var(--text-muted);
            font-size: 15px;
            grid-column: 1 / -1;
        }

        /* Steps / Process */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            position: relative;
        }
        .step-card {
            text-align: center;
            padding: 32px 20px;
            background: var(--dark-card);
            border: 1px solid var(--dark-card-border);
            border-radius: var(--radius-lg);
            position: relative;
            transition: all var(--transition);
        }
        .step-card:hover {
            border-color: rgba(255, 255, 255, 0.3);
            transform: translateY(-3px);
            box-shadow: var(--shadow-dark);
        }
        .step-card .step-num {
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), #3b82f6);
            color: #fff;
            font-weight: 800;
            font-size: 22px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            box-shadow: 0 6px 20px rgba(0, 102, 224, 0.4);
        }
        .step-card h4 {
            font-size: 17px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 8px;
        }
        .step-card p {
            font-size: 13px;
            color: #9ca3af;
            line-height: 1.55;
        }

        /* FAQ */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            border: 1px solid var(--border);
            border-radius: var(--radius);
            overflow: hidden;
            background: #fff;
            transition: all var(--transition-fast);
        }
        .faq-item:hover {
            border-color: #cbd5e1;
        }
        .faq-question {
            width: 100%;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 22px;
            background: none;
            font-size: 16px;
            font-weight: 600;
            color: var(--text);
            cursor: pointer;
            text-align: left;
            gap: 16px;
        }
        .faq-question i {
            font-size: 14px;
            color: var(--text-muted);
            transition: transform var(--transition-fast);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow), padding var(--transition-slow);
            padding: 0 22px;
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 22px 20px;
        }

        /* CTA Section */
        .cta-section {
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
            border: 1px solid var(--dark-card-border);
            border-radius: var(--radius-xl);
            padding: 60px 50px;
            text-align: center;
            position: relative;
            overflow: hidden;
            color: #fff;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -60px;
            width: 200px;
            height: 200px;
            background: radial-gradient(circle, rgba(0, 102, 224, 0.35) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-section h2 {
            font-size: 32px;
            font-weight: 800;
            margin-bottom: 14px;
            position: relative;
            z-index: 1;
        }
        .cta-section p {
            font-size: 16px;
            color: #c9cdd4;
            margin-bottom: 28px;
            position: relative;
            z-index: 1;
        }
        .cta-section .btn {
            position: relative;
            z-index: 1;
        }

        /* Footer */
        .site-footer {
            background: var(--dark-bg);
            color: #9ca3af;
            padding: 40px 0;
            border-top: 1px solid var(--dark-card-border);
            margin-top: auto;
        }
        .footer-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
        }
        .footer-brand {
            font-size: 15px;
            font-weight: 700;
            color: #e5e7eb;
        }
        .footer-links {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
        }
        .footer-links a {
            font-size: 13px;
            color: #6b7280;
            transition: color var(--transition-fast);
        }
        .footer-links a:hover {
            color: #e5e7eb;
        }
        .footer-copy {
            font-size: 12px;
            color: #4b5563;
            width: 100%;
            text-align: center;
            margin-top: 8px;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            :root {
                --sidebar-width: 220px;
            }
            .hero-content {
                grid-template-columns: 1fr;
                gap: 36px;
            }
            .hero-text h1 {
                font-size: 38px;
            }
            .hero-metrics {
                grid-template-columns: repeat(4, 1fr);
                gap: 14px;
            }
            .metric-card {
                padding: 20px 14px;
            }
            .metric-card .metric-value {
                font-size: 28px;
            }
            .cards-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-bar {
                grid-template-columns: repeat(2, 1fr);
                border-radius: var(--radius);
            }
            .stat-item {
                border-bottom: 1px solid var(--dark-card-border);
            }
            .stat-item:nth-child(2) {
                border-right: none;
            }
            .stat-item:nth-child(3),
            .stat-item:nth-child(4) {
                border-bottom: none;
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .advantage-grid {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            .category-card {
                flex-direction: column;
            }
            .category-card .cat-img {
                width: 100%;
                height: 180px;
            }
            .category-card .cat-body {
                padding: 20px;
            }
        }

        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
            }
            .sidebar.open {
                transform: translateX(0);
                box-shadow: 6px 0 30px rgba(0, 0, 0, 0.5);
            }
            .sidebar-overlay {
                display: block;
            }
            .mobile-header {
                display: flex;
            }
            .main-content {
                margin-left: 0;
                padding-top: 58px;
            }
            .hero {
                padding: 60px 0 50px;
            }
            .hero-text h1 {
                font-size: 30px;
            }
            .hero-text p {
                font-size: 15px;
            }
            .hero-metrics {
                grid-template-columns: repeat(2, 1fr);
                gap: 10px;
            }
            .metric-card .metric-value {
                font-size: 26px;
            }
            .cards-grid {
                grid-template-columns: 1fr;
            }
            .stats-bar {
                grid-template-columns: 1fr 1fr;
            }
            .stat-item .stat-num {
                font-size: 28px;
            }
            .news-list {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr 1fr;
            }
            .section {
                padding: 50px 0;
            }
            .section-header h2 {
                font-size: 26px;
            }
            .cta-section {
                padding: 40px 24px;
                border-radius: var(--radius);
            }
            .cta-section h2 {
                font-size: 24px;
            }
            .container {
                padding: 0 16px;
            }
            .footer-inner {
                flex-direction: column;
                text-align: center;
            }
        }

        @media (max-width: 520px) {
            .hero-text h1 {
                font-size: 24px;
            }
            .hero-buttons {
                flex-direction: column;
            }
            .hero-buttons .btn {
                width: 100%;
            }
            .hero-metrics {
                grid-template-columns: 1fr 1fr;
                gap: 8px;
            }
            .metric-card {
                padding: 16px 10px;
            }
            .metric-card .metric-value {
                font-size: 22px;
            }
            .stats-bar {
                grid-template-columns: 1fr;
            }
            .stat-item {
                border-right: none;
                border-bottom: 1px solid var(--dark-card-border);
            }
            .stat-item:last-child {
                border-bottom: none;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .section-header h2 {
                font-size: 22px;
            }
            .btn-lg {
                padding: 14px 24px;
                font-size: 15px;
            }
            .faq-question {
                font-size: 14px;
                padding: 16px 14px;
            }
            .faq-answer {
                padding: 0 14px;
            }
            .faq-item.open .faq-answer {
                padding: 0 14px 16px;
            }
            .category-card .cat-img {
                height: 140px;
            }
            .category-card .cat-body h3 {
                font-size: 20px;
            }
            .advantage-item {
                flex-direction: column;
                align-items: flex-start;
            }
        }

/* roulang page: category1 */
/* ========== CSS设计变量 ========== */
        :root {
            --primary: #1e40af;
            --primary-dark: #1e3a8a;
            --primary-light: #3b82f6;
            --primary-glow: #60a5fa;
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --accent-light: #fbbf24;
            --success: #10b981;
            --success-light: #34d399;
            --danger: #ef4444;
            --dark-bg: #0f172a;
            --dark-surface: #1e293b;
            --dark-border: #334155;
            --text-primary: #1e293b;
            --text-secondary: #475569;
            --text-muted: #64748b;
            --text-light: #94a3b8;
            --text-on-dark: #e2e8f0;
            --text-on-dark-muted: #94a3b8;
            --bg-page: #f1f5f9;
            --bg-surface: #ffffff;
            --bg-card: #ffffff;
            --bg-subtle: #f8fafc;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 6px;
            --radius: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --radius-full: 9999px;
            --shadow-xs: 0 1px 2px rgba(0,0,0,0.04);
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
            --shadow: 0 4px 24px rgba(0,0,0,0.07);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.10);
            --shadow-xl: 0 20px 60px rgba(0,0,0,0.13);
            --shadow-glow: 0 0 40px rgba(59,130,246,0.25);
            --sidebar-width: 250px;
            --header-mobile-height: 60px;
            --transition-fast: 0.15s ease;
            --transition: 0.25s ease;
            --transition-slow: 0.35s ease;
            --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
            --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
        }

        /* ========== 基础Reset ========== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
            font-size: 16px;
        }

        body {
            font-family: var(--font-sans);
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-page);
            min-height: 100vh;
            display: flex;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

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

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

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
        }

        button {
            cursor: pointer;
        }

        ul,
        ol {
            list-style: none;
        }

        h1, h2, h3, h4, h5, h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--text-primary);
        }

        /* ========== 侧边栏 - App Shell导航 ========== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--dark-bg);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            border-right: 1px solid var(--dark-border);
            transition: transform var(--transition-slow), box-shadow var(--transition);
            overflow-y: auto;
        }

        .sidebar-brand {
            padding: 28px 24px 20px;
            border-bottom: 1px solid var(--dark-border);
            flex-shrink: 0;
        }

        .sidebar-brand .brand-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.25rem;
            font-weight: 800;
            color: #ffffff;
            letter-spacing: -0.02em;
        }

        .sidebar-brand .brand-logo .logo-icon {
            width: 38px;
            height: 38px;
            background: linear-gradient(135deg, var(--primary-light), var(--primary));
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            color: #fff;
            flex-shrink: 0;
        }

        .sidebar-brand .brand-subtitle {
            font-size: 0.72rem;
            color: var(--text-light);
            margin-top: 4px;
            padding-left: 48px;
            letter-spacing: 0.04em;
        }

        .sidebar-nav {
            flex: 1;
            padding: 16px 14px;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            border-radius: var(--radius);
            color: var(--text-on-dark-muted);
            font-weight: 500;
            font-size: 0.95rem;
            transition: all var(--transition-fast);
            position: relative;
            white-space: nowrap;
        }

        .sidebar-nav a i {
            width: 20px;
            text-align: center;
            font-size: 1rem;
            flex-shrink: 0;
        }

        .sidebar-nav a:hover {
            background: var(--dark-surface);
            color: #ffffff;
            transform: translateX(2px);
        }

        .sidebar-nav a.active {
            background: linear-gradient(135deg, rgba(59,130,246,0.25), rgba(30,64,175,0.35));
            color: #ffffff;
            font-weight: 600;
            box-shadow: 0 0 20px rgba(59,130,246,0.15);
            border: 1px solid rgba(59,130,246,0.3);
        }

        .sidebar-nav a.active i {
            color: var(--primary-glow);
        }

        .sidebar-nav a.active::before {
            content: '';
            position: absolute;
            left: -14px;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 20px;
            background: var(--primary-glow);
            border-radius: 0 3px 3px 0;
        }

        .sidebar-footer-meta {
            padding: 16px 20px;
            border-top: 1px solid var(--dark-border);
            flex-shrink: 0;
        }

        .sidebar-footer-meta .sidebar-status {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.75rem;
            color: var(--text-light);
        }

        .sidebar-footer-meta .status-dot {
            width: 7px;
            height: 7px;
            border-radius: 50%;
            background: var(--success);
            box-shadow: 0 0 6px var(--success-light);
            animation: pulse-dot 2s infinite;
        }

        @keyframes pulse-dot {
            0%, 100% { opacity: 1; box-shadow: 0 0 6px var(--success-light); }
            50% { opacity: 0.5; box-shadow: 0 0 12px var(--success-light); }
        }

        /* ========== 主内容区 ========== */
        .main-content {
            flex: 1;
            margin-left: var(--sidebar-width);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            background: var(--bg-page);
            transition: margin-left var(--transition-slow);
            position: relative;
        }

        /* ========== 移动端菜单按钮 ========== */
        .mobile-menu-toggle {
            display: none;
            position: fixed;
            top: 14px;
            left: 14px;
            z-index: 1100;
            width: 40px;
            height: 40px;
            border-radius: var(--radius-sm);
            background: var(--dark-bg);
            color: #fff;
            font-size: 1.2rem;
            align-items: center;
            justify-content: center;
            box-shadow: var(--shadow-lg);
            border: 1px solid var(--dark-border);
        }

        .mobile-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.55);
            z-index: 999;
            transition: opacity var(--transition);
        }

        .mobile-overlay.active {
            display: block;
        }

        /* ========== 分类Banner ========== */
        .category-banner {
            position: relative;
            background: url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            padding: 70px 40px 60px;
            overflow: hidden;
        }

        .category-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15,23,42,0.88) 0%, rgba(30,64,175,0.78) 50%, rgba(15,23,42,0.85) 100%);
            z-index: 1;
        }

        .category-banner .banner-inner {
            position: relative;
            z-index: 2;
            max-width: 1000px;
        }

        .category-banner .breadcrumb {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 0.85rem;
            color: var(--text-on-dark-muted);
            margin-bottom: 20px;
            flex-wrap: wrap;
        }

        .category-banner .breadcrumb a {
            color: var(--text-on-dark-muted);
            transition: color var(--transition-fast);
        }

        .category-banner .breadcrumb a:hover {
            color: #ffffff;
        }

        .category-banner .breadcrumb .separator {
            color: var(--text-light);
        }

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

        .category-banner .banner-tag {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(245,158,11,0.2);
            border: 1px solid rgba(245,158,11,0.4);
            border-radius: var(--radius-full);
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--accent-light);
            letter-spacing: 0.03em;
            margin-bottom: 18px;
        }

        .category-banner h1 {
            font-size: 2.8rem;
            font-weight: 800;
            color: #ffffff;
            letter-spacing: -0.03em;
            margin-bottom: 14px;
            line-height: 1.2;
        }

        .category-banner .banner-desc {
            font-size: 1.1rem;
            color: var(--text-on-dark-muted);
            max-width: 600px;
            line-height: 1.7;
        }

        .category-banner .banner-stats-row {
            display: flex;
            gap: 40px;
            margin-top: 32px;
            flex-wrap: wrap;
        }

        .category-banner .banner-stat-item .stat-value {
            font-size: 2rem;
            font-weight: 800;
            color: #ffffff;
            letter-spacing: -0.02em;
        }

        .category-banner .banner-stat-item .stat-value .accent-num {
            color: var(--accent-light);
        }

        .category-banner .banner-stat-item .stat-label {
            font-size: 0.82rem;
            color: var(--text-on-dark-muted);
            margin-top: 2px;
        }

        /* ========== 容器 ========== */
        .container {
            max-width: 1100px;
            margin: 0 auto;
            padding: 0 28px;
        }

        .container-wide {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 28px;
        }

        /* ========== 板块间距 ========== */
        .section {
            padding: 56px 0;
        }

        .section-sm {
            padding: 36px 0;
        }

        .section-lg {
            padding: 72px 0;
        }

        /* ========== 数据指标条 - 深色沉浸区块 ========== */
        .metrics-strip {
            background: var(--dark-bg);
            padding: 40px 0;
            position: relative;
            overflow: hidden;
        }

        .metrics-strip::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -20%;
            width: 60%;
            height: 200%;
            background: radial-gradient(ellipse, rgba(59,130,246,0.08) 0%, transparent 70%);
            pointer-events: none;
        }

        .metrics-strip .metrics-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
            z-index: 1;
        }

        .metrics-strip .metric-card {
            text-align: center;
            padding: 20px 16px;
            border-radius: var(--radius);
            background: rgba(255,255,255,0.03);
            border: 1px solid var(--dark-border);
            transition: all var(--transition);
        }

        .metrics-strip .metric-card:hover {
            background: rgba(255,255,255,0.06);
            border-color: rgba(255,255,255,0.15);
            transform: translateY(-3px);
            box-shadow: var(--shadow-glow);
        }

        .metrics-strip .metric-icon {
            font-size: 1.8rem;
            color: var(--accent);
            margin-bottom: 10px;
        }

        .metrics-strip .metric-value {
            font-size: 2.2rem;
            font-weight: 800;
            color: #ffffff;
            letter-spacing: -0.02em;
            font-family: var(--font-mono);
        }

        .metrics-strip .metric-value .highlight {
            color: var(--accent-light);
        }

        .metrics-strip .metric-label {
            font-size: 0.82rem;
            color: var(--text-on-dark-muted);
            margin-top: 4px;
        }

        /* ========== 内容卡片网格 ========== */
        .articles-section {
            background: var(--bg-page);
        }

        .section-header {
            display: flex;
            align-items: flex-end;
            justify-content: space-between;
            margin-bottom: 32px;
            flex-wrap: wrap;
            gap: 16px;
        }

        .section-header h2 {
            font-size: 1.75rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            position: relative;
            padding-left: 16px;
        }

        .section-header h2::before {
            content: '';
            position: absolute;
            left: 0;
            top: 6px;
            bottom: 6px;
            width: 4px;
            background: var(--primary-light);
            border-radius: 2px;
        }

        .section-header .result-count {
            font-size: 0.88rem;
            color: var(--text-muted);
            font-weight: 500;
        }

        .articles-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .article-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
            position: relative;
        }

        .article-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }

        .article-card .card-image-wrap {
            position: relative;
            aspect-ratio: 16 / 10;
            overflow: hidden;
            background: var(--bg-subtle);
        }

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

        .article-card:hover .card-image-wrap img {
            transform: scale(1.06);
        }

        .article-card .card-image-wrap .card-tag {
            position: absolute;
            top: 12px;
            left: 12px;
            padding: 4px 12px;
            background: rgba(15,23,42,0.8);
            color: #fff;
            font-size: 0.72rem;
            font-weight: 600;
            border-radius: var(--radius-full);
            letter-spacing: 0.03em;
            backdrop-filter: blur(6px);
        }

        .article-card .card-body {
            padding: 20px 18px 18px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .article-card .card-body h3 {
            font-size: 1.05rem;
            font-weight: 700;
            line-height: 1.45;
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            color: var(--text-primary);
            transition: color var(--transition-fast);
        }

        .article-card:hover .card-body h3 {
            color: var(--primary);
        }

        .article-card .card-body .card-excerpt {
            font-size: 0.88rem;
            color: var(--text-muted);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            flex: 1;
        }

        .article-card .card-footer {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 12px 18px 16px;
            font-size: 0.78rem;
            color: var(--text-muted);
        }

        .article-card .card-footer .card-date {
            display: flex;
            align-items: center;
            gap: 5px;
        }

        .article-card .card-footer .card-read-time {
            display: flex;
            align-items: center;
            gap: 5px;
            color: var(--text-light);
        }

        /* ========== 特色区块 ========== */
        .features-section {
            background: var(--bg-surface);
            border-top: 1px solid var(--border-light);
            border-bottom: 1px solid var(--border-light);
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .feature-item {
            text-align: center;
            padding: 32px 20px;
            border-radius: var(--radius-lg);
            transition: all var(--transition);
            background: var(--bg-subtle);
            border: 1px solid transparent;
        }

        .feature-item:hover {
            background: var(--bg-card);
            border-color: var(--border);
            box-shadow: var(--shadow);
            transform: translateY(-3px);
        }

        .feature-item .feature-icon-wrap {
            width: 56px;
            height: 56px;
            margin: 0 auto 18px;
            border-radius: var(--radius);
            background: linear-gradient(135deg, rgba(59,130,246,0.12), rgba(30,64,175,0.18));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--primary);
        }

        .feature-item h4 {
            font-size: 1.05rem;
            margin-bottom: 8px;
            font-weight: 700;
        }

        .feature-item p {
            font-size: 0.88rem;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* ========== FAQ区块 ========== */
        .faq-section {
            background: var(--bg-page);
        }

        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            overflow: hidden;
            transition: all var(--transition);
        }

        .faq-item:hover {
            border-color: var(--primary-light);
            box-shadow: var(--shadow-sm);
        }

        .faq-question {
            padding: 18px 22px;
            font-weight: 600;
            font-size: 0.98rem;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            color: var(--text-primary);
            transition: color var(--transition-fast);
            user-select: none;
        }

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

        .faq-question .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: var(--bg-subtle);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.7rem;
            transition: all var(--transition);
            color: var(--text-muted);
        }

        .faq-item.open .faq-question .faq-icon {
            background: var(--primary);
            color: #fff;
            transform: rotate(45deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow), padding var(--transition-slow);
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 22px 20px;
        }

        /* ========== CTA区块 ========== */
        .cta-section {
            background: linear-gradient(135deg, var(--dark-bg) 0%, #1a2740 50%, var(--dark-bg) 100%);
            padding: 60px 0;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: 20%;
            right: -10%;
            width: 50%;
            height: 60%;
            background: radial-gradient(ellipse, rgba(59,130,246,0.1) 0%, transparent 70%);
            pointer-events: none;
        }

        .cta-section .cta-inner {
            text-align: center;
            position: relative;
            z-index: 1;
        }

        .cta-section h2 {
            font-size: 2rem;
            font-weight: 800;
            color: #ffffff;
            letter-spacing: -0.02em;
            margin-bottom: 12px;
        }

        .cta-section p {
            font-size: 1.05rem;
            color: var(--text-on-dark-muted);
            margin-bottom: 28px;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 28px;
            border-radius: var(--radius-full);
            font-weight: 600;
            font-size: 0.95rem;
            letter-spacing: 0.01em;
            transition: all var(--transition);
            cursor: pointer;
            text-align: center;
            white-space: nowrap;
        }

        .btn-primary {
            background: var(--accent);
            color: #1e293b;
            box-shadow: 0 4px 16px rgba(245,158,11,0.35);
        }

        .btn-primary:hover {
            background: var(--accent-dark);
            color: #fff;
            box-shadow: 0 6px 24px rgba(245,158,11,0.45);
            transform: translateY(-2px);
        }

        .btn-outline-light {
            background: transparent;
            color: #ffffff;
            border: 2px solid rgba(255,255,255,0.3);
        }

        .btn-outline-light:hover {
            border-color: #ffffff;
            background: rgba(255,255,255,0.08);
            transform: translateY(-2px);
        }

        .btn-lg {
            padding: 15px 36px;
            font-size: 1.05rem;
        }

        .cta-section .btn-group {
            display: flex;
            gap: 14px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* ========== 页脚 ========== */
        .site-footer {
            background: var(--dark-bg);
            padding: 28px 0;
            border-top: 1px solid var(--dark-border);
            flex-shrink: 0;
        }

        .site-footer .container {
            max-width: 1100px;
            margin: 0 auto;
            padding: 0 28px;
        }

        .footer-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
        }

        .footer-brand {
            color: #ffffff;
            font-weight: 700;
            font-size: 1rem;
            letter-spacing: -0.01em;
        }

        .footer-links {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
        }

        .footer-links a {
            color: var(--text-on-dark-muted);
            font-size: 0.88rem;
            transition: color var(--transition-fast);
        }

        .footer-links a:hover {
            color: #ffffff;
        }

        .footer-copy {
            color: var(--text-light);
            font-size: 0.82rem;
        }

        /* ========== 响应式断点 ========== */

        /* 平板及以下 - 1024px */
        @media (max-width: 1024px) {
            :root {
                --sidebar-width: 220px;
            }

            .category-banner h1 {
                font-size: 2.2rem;
            }

            .articles-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }

            .features-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }

            .metrics-strip .metrics-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }

            .category-banner {
                padding: 50px 28px 44px;
            }

            .category-banner .banner-stats-row {
                gap: 28px;
            }

            .section {
                padding: 44px 0;
            }

            .section-lg {
                padding: 56px 0;
            }

            .container,
            .container-wide {
                padding: 0 20px;
            }

            .site-footer .container {
                padding: 0 20px;
            }
        }

        /* 小平板/大手机 - 768px */
        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
                box-shadow: none;
            }

            .sidebar.open {
                transform: translateX(0);
                box-shadow: var(--shadow-xl);
            }

            .main-content {
                margin-left: 0 !important;
            }

            .mobile-menu-toggle {
                display: flex;
            }

            .category-banner {
                padding: 44px 20px 36px;
            }

            .category-banner h1 {
                font-size: 1.75rem;
            }

            .category-banner .banner-desc {
                font-size: 0.95rem;
            }

            .category-banner .banner-stats-row {
                gap: 20px;
                margin-top: 24px;
            }

            .category-banner .banner-stat-item .stat-value {
                font-size: 1.5rem;
            }

            .articles-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }

            .features-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }

            .metrics-strip .metrics-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 12px;
            }

            .metrics-strip .metric-value {
                font-size: 1.6rem;
            }

            .section-header h2 {
                font-size: 1.4rem;
            }

            .section {
                padding: 36px 0;
            }

            .section-lg {
                padding: 44px 0;
            }

            .cta-section h2 {
                font-size: 1.5rem;
            }

            .container,
            .container-wide {
                padding: 0 16px;
            }

            .site-footer .container {
                padding: 0 16px;
            }

            .footer-inner {
                flex-direction: column;
                text-align: center;
                gap: 10px;
            }

            .footer-links {
                justify-content: center;
            }

            .article-card .card-body h3 {
                font-size: 0.95rem;
            }
        }

        /* 手机 - 520px */
        @media (max-width: 520px) {
            .category-banner {
                padding: 36px 16px 30px;
            }

            .category-banner h1 {
                font-size: 1.45rem;
            }

            .category-banner .banner-desc {
                font-size: 0.88rem;
            }

            .category-banner .banner-stats-row {
                gap: 14px;
                margin-top: 18px;
            }

            .category-banner .banner-stat-item .stat-value {
                font-size: 1.25rem;
            }

            .category-banner .banner-stat-item .stat-label {
                font-size: 0.72rem;
            }

            .articles-grid {
                grid-template-columns: 1fr;
                gap: 14px;
            }

            .features-grid {
                grid-template-columns: 1fr;
                gap: 12px;
            }

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

            .metrics-strip .metric-value {
                font-size: 1.35rem;
            }

            .metrics-strip .metric-card {
                padding: 14px 10px;
            }

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

            .section-header h2 {
                font-size: 1.25rem;
            }

            .cta-section h2 {
                font-size: 1.3rem;
            }

            .cta-section p {
                font-size: 0.9rem;
            }

            .btn {
                padding: 11px 22px;
                font-size: 0.88rem;
            }

            .btn-lg {
                padding: 13px 28px;
                font-size: 0.95rem;
            }

            .faq-question {
                font-size: 0.9rem;
                padding: 15px 16px;
            }

            .faq-item.open .faq-answer {
                padding: 0 16px 16px;
            }

            .container,
            .container-wide {
                padding: 0 14px;
            }

            .site-footer .container {
                padding: 0 14px;
            }
        }

/* roulang page: article */
:root {
            --sidebar-bg: #111827;
            --sidebar-bg-hover: #1c2538;
            --sidebar-text: #b0b8c8;
            --sidebar-text-active: #ffffff;
            --sidebar-accent: #f59e0b;
            --sidebar-accent-glow: rgba(245, 158, 11, 0.25);
            --sidebar-width: 250px;
            --content-bg: #f3f4f6;
            --card-bg: #ffffff;
            --card-shadow: 0 1px 3px rgba(0,0,0,0.06), 0 4px 16px rgba(0,0,0,0.04);
            --card-shadow-hover: 0 4px 12px rgba(0,0,0,0.10), 0 8px 28px rgba(0,0,0,0.06);
            --text-primary: #111827;
            --text-secondary: #4b5563;
            --text-muted: #9ca3af;
            --border-color: #e5e7eb;
            --border-light: #f1f3f5;
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --accent-light: #fef3c7;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --transition-fast: 0.18s ease;
            --transition-smooth: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
            --mobile-header-height: 56px;
        }

        *,
        *::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-sans);
            line-height: 1.6;
            color: var(--text-primary);
            background: var(--content-bg);
            min-height: 100vh;
            overflow-x: hidden;
        }

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

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

        button {
            cursor: pointer;
            border: none;
            background: none;
            font-family: inherit;
            font-size: inherit;
            outline: none;
        }

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

        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }

        /* App Layout */
        .app-layout {
            display: flex;
            min-height: 100vh;
            position: relative;
        }

        /* Mobile Header */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--mobile-header-height);
            background: var(--sidebar-bg);
            z-index: 100;
            align-items: center;
            padding: 0 16px;
            gap: 12px;
            box-shadow: 0 2px 12px rgba(0,0,0,0.18);
        }

        .mobile-header .hamburger-btn {
            width: 40px;
            height: 40px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #ffffff;
            font-size: 1.3rem;
            flex-shrink: 0;
            transition: background var(--transition-fast);
        }

        .mobile-header .hamburger-btn:hover {
            background: var(--sidebar-bg-hover);
        }

        .mobile-header .mobile-brand {
            font-weight: 700;
            font-size: 1.1rem;
            color: #ffffff;
            letter-spacing: 0.02em;
            white-space: nowrap;
        }

        .mobile-header .mobile-brand .brand-accent {
            color: var(--sidebar-accent);
        }

        /* Sidebar */
        .sidebar {
            width: var(--sidebar-width);
            min-width: var(--sidebar-width);
            background: var(--sidebar-bg);
            color: var(--sidebar-text);
            display: flex;
            flex-direction: column;
            height: 100vh;
            position: sticky;
            top: 0;
            left: 0;
            z-index: 90;
            overflow-y: auto;
            overflow-x: hidden;
            border-right: 1px solid rgba(255,255,255,0.06);
            transition: transform var(--transition-smooth);
            padding: 0;
        }

        .sidebar-brand {
            padding: 24px 20px 10px 20px;
            font-size: 1.35rem;
            font-weight: 800;
            color: #ffffff;
            letter-spacing: 0.03em;
            white-space: nowrap;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .sidebar-brand .brand-icon {
            width: 36px;
            height: 36px;
            border-radius: var(--radius-sm);
            background: var(--sidebar-accent);
            color: #111827;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 900;
            font-size: 1rem;
            flex-shrink: 0;
        }

        .sidebar-divider {
            height: 1px;
            background: rgba(255,255,255,0.08);
            margin: 8px 16px;
        }

        .sidebar-nav {
            display: flex;
            flex-direction: column;
            gap: 4px;
            padding: 4px 12px;
            flex: 0 0 auto;
        }

        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 11px 14px;
            border-radius: var(--radius-sm);
            color: var(--sidebar-text);
            font-weight: 500;
            font-size: 0.95rem;
            transition: all var(--transition-fast);
            white-space: nowrap;
            position: relative;
        }

        .sidebar-nav a i {
            width: 20px;
            text-align: center;
            font-size: 0.95rem;
            flex-shrink: 0;
        }

        .sidebar-nav a:hover {
            background: var(--sidebar-bg-hover);
            color: #e0e4ec;
        }

        .sidebar-nav a.active {
            background: var(--sidebar-accent-glow);
            color: var(--sidebar-accent);
            font-weight: 600;
            box-shadow: inset 3px 0 0 var(--sidebar-accent);
        }

        /* Sidebar Stats */
        .sidebar-stats {
            margin: auto 12px 12px 12px;
            padding: 14px 16px;
            background: rgba(255,255,255,0.03);
            border-radius: var(--radius-md);
            border: 1px solid rgba(255,255,255,0.06);
        }

        .sidebar-stats .stat-item {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 6px 0;
        }

        .sidebar-stats .stat-item + .stat-item {
            border-top: 1px solid rgba(255,255,255,0.05);
        }

        .sidebar-stats .stat-label {
            font-size: 0.78rem;
            color: var(--sidebar-text);
        }

        .sidebar-stats .stat-value {
            font-size: 0.9rem;
            font-weight: 700;
            color: var(--sidebar-accent);
        }

        /* Sidebar Overlay */
        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.55);
            z-index: 85;
            opacity: 0;
            transition: opacity var(--transition-smooth);
        }

        .sidebar-overlay.visible {
            opacity: 1;
        }

        /* Main Content */
        .main-content {
            flex: 1;
            min-width: 0;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

        .main-content-inner {
            flex: 1;
            padding: 32px 36px 48px 36px;
            max-width: 900px;
            width: 100%;
            margin: 0 auto;
        }

        /* Breadcrumb */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
            font-size: 0.88rem;
            color: var(--text-muted);
            margin-bottom: 20px;
        }

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

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

        .breadcrumb .separator {
            color: #cbd5e1;
            font-size: 0.7rem;
        }

        .breadcrumb .current {
            color: var(--text-primary);
            font-weight: 500;
            max-width: 320px;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }

        /* Article Hero Image */
        .article-hero {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            margin-bottom: 28px;
            aspect-ratio: 21/9;
            min-height: 200px;
            background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
        }

        .article-hero img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .article-hero .hero-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 60%;
            background: linear-gradient(to top, rgba(0,0,0,0.55) 0%, transparent 100%);
            pointer-events: none;
        }

        .article-hero .hero-category-tag {
            position: absolute;
            top: 16px;
            left: 16px;
            background: var(--accent);
            color: #1a1a2e;
            padding: 6px 14px;
            border-radius: 20px;
            font-size: 0.82rem;
            font-weight: 700;
            letter-spacing: 0.02em;
            z-index: 2;
        }

        /* Article Header */
        .article-header {
            margin-bottom: 24px;
        }

        .article-header h1 {
            font-size: 2rem;
            font-weight: 800;
            line-height: 1.3;
            color: var(--text-primary);
            margin-bottom: 14px;
            letter-spacing: -0.01em;
        }

        .article-meta {
            display: flex;
            align-items: center;
            gap: 18px;
            flex-wrap: wrap;
            font-size: 0.9rem;
            color: var(--text-muted);
        }

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

        .article-meta .meta-item i {
            font-size: 0.85rem;
            color: var(--accent);
        }

        .article-meta .meta-tag {
            background: var(--accent-light);
            color: var(--accent-dark);
            padding: 4px 12px;
            border-radius: 20px;
            font-weight: 600;
            font-size: 0.8rem;
        }

        /* Data Highlight Bar */
        .data-highlight-bar {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 14px;
            margin-bottom: 32px;
            padding: 18px 20px;
            background: linear-gradient(135deg, #1a1d2e 0%, #1f2538 100%);
            border-radius: var(--radius-lg);
            border: 1px solid rgba(255,255,255,0.06);
        }

        .data-highlight-bar .data-item {
            text-align: center;
            padding: 8px 4px;
        }

        .data-highlight-bar .data-value {
            font-size: 1.6rem;
            font-weight: 800;
            color: var(--accent);
            line-height: 1.2;
            letter-spacing: -0.02em;
        }

        .data-highlight-bar .data-label {
            font-size: 0.78rem;
            color: #94a3b8;
            margin-top: 4px;
            font-weight: 500;
        }

        /* Article Body */
        .article-body {
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            padding: 36px 40px;
            box-shadow: var(--card-shadow);
            border: 1px solid var(--border-light);
            line-height: 1.8;
            color: var(--text-primary);
            font-size: 1.02rem;
        }

        .article-body h2 {
            font-size: 1.45rem;
            font-weight: 700;
            margin: 32px 0 14px 0;
            color: var(--text-primary);
            padding-bottom: 8px;
            border-bottom: 2px solid var(--border-color);
        }

        .article-body h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin: 24px 0 10px 0;
            color: var(--text-primary);
        }

        .article-body h4 {
            font-size: 1.05rem;
            font-weight: 600;
            margin: 20px 0 8px 0;
            color: var(--text-secondary);
        }

        .article-body p {
            margin-bottom: 16px;
        }

        .article-body ul,
        .article-body ol {
            margin: 12px 0 20px 0;
            padding-left: 24px;
        }

        .article-body li {
            margin-bottom: 8px;
        }

        .article-body li::marker {
            color: var(--accent);
        }

        .article-body img {
            border-radius: var(--radius-md);
            margin: 24px 0;
            box-shadow: var(--card-shadow);
        }

        .article-body blockquote {
            border-left: 4px solid var(--accent);
            background: #fffbeb;
            padding: 16px 22px;
            margin: 20px 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: #92400e;
            font-style: italic;
        }

        .article-body code {
            background: #f1f5f9;
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 0.9em;
            color: #e11d48;
        }

        .article-body pre {
            background: #1e293b;
            color: #e2e8f0;
            padding: 20px 24px;
            border-radius: var(--radius-md);
            overflow-x: auto;
            margin: 20px 0;
            font-size: 0.9rem;
            line-height: 1.6;
        }

        .article-body pre code {
            background: transparent;
            color: inherit;
            padding: 0;
            font-size: inherit;
        }

        .article-body a {
            color: var(--accent-dark);
            text-decoration: underline;
            text-underline-offset: 2px;
        }

        .article-body a:hover {
            color: #b45309;
        }

        .article-body table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            font-size: 0.92rem;
        }

        .article-body th,
        .article-body td {
            border: 1px solid var(--border-color);
            padding: 10px 14px;
            text-align: left;
        }

        .article-body th {
            background: #f8fafc;
            font-weight: 600;
            color: var(--text-primary);
        }

        /* Article Not Found */
        .article-not-found {
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            padding: 60px 40px;
            box-shadow: var(--card-shadow);
            border: 1px solid var(--border-light);
            text-align: center;
        }

        .article-not-found .not-found-icon {
            font-size: 3.5rem;
            color: var(--text-muted);
            margin-bottom: 18px;
        }

        .article-not-found h2 {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 10px;
        }

        .article-not-found p {
            color: var(--text-secondary);
            margin-bottom: 24px;
            font-size: 0.95rem;
        }

        .article-not-found .btn-return {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--accent);
            color: #1a1a2e;
            padding: 12px 26px;
            border-radius: 30px;
            font-weight: 700;
            font-size: 0.95rem;
            transition: all var(--transition-fast);
            text-decoration: none;
        }

        .article-not-found .btn-return:hover {
            background: var(--accent-dark);
            color: #ffffff;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(245, 158, 11, 0.35);
        }

        /* Bottom Action Bar */
        .article-bottom-bar {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
            margin-top: 28px;
            padding: 16px 20px;
            background: var(--card-bg);
            border-radius: var(--radius-md);
            box-shadow: var(--card-shadow);
            border: 1px solid var(--border-light);
        }

        .article-bottom-bar .back-link {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 0.92rem;
            transition: color var(--transition-fast);
        }

        .article-bottom-bar .back-link:hover {
            color: var(--accent-dark);
        }

        .article-bottom-bar .share-hint {
            color: var(--text-muted);
            font-size: 0.85rem;
        }

        /* Footer */
        .site-footer {
            background: #ffffff;
            border-top: 1px solid var(--border-color);
            padding: 20px 36px;
            margin-top: auto;
        }

        .site-footer .container {
            max-width: 900px;
            margin: 0 auto;
        }

        .footer-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        .footer-brand {
            font-weight: 700;
            color: var(--text-primary);
            font-size: 0.92rem;
        }

        .footer-links {
            display: flex;
            gap: 18px;
            flex-wrap: wrap;
        }

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

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

        .footer-copy {
            white-space: nowrap;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            :root {
                --sidebar-width: 220px;
            }

            .main-content-inner {
                padding: 24px 24px 36px 24px;
            }

            .article-body {
                padding: 28px 24px;
            }

            .article-header h1 {
                font-size: 1.65rem;
            }

            .data-highlight-bar {
                grid-template-columns: repeat(2, 1fr);
                gap: 10px;
                padding: 14px 12px;
            }

            .data-highlight-bar .data-value {
                font-size: 1.35rem;
            }
        }

        @media (max-width: 768px) {
            .app-layout {
                flex-direction: column;
            }

            .mobile-header {
                display: flex;
            }

            .sidebar {
                position: fixed;
                top: 0;
                left: 0;
                height: 100vh;
                width: 270px;
                min-width: 270px;
                transform: translateX(-100%);
                z-index: 95;
                border-right: 1px solid rgba(255,255,255,0.08);
                box-shadow: 4px 0 24px rgba(0,0,0,0.3);
            }

            .sidebar.open {
                transform: translateX(0);
            }

            .sidebar-overlay {
                display: block;
                pointer-events: none;
            }

            .sidebar-overlay.visible {
                pointer-events: auto;
            }

            .main-content {
                padding-top: var(--mobile-header-height);
            }

            .main-content-inner {
                padding: 20px 16px 32px 16px;
            }

            .article-hero {
                aspect-ratio: 16/9;
                min-height: 180px;
                border-radius: var(--radius-md);
            }

            .article-header h1 {
                font-size: 1.4rem;
            }

            .article-meta {
                gap: 10px;
                font-size: 0.82rem;
            }

            .article-body {
                padding: 22px 16px;
                font-size: 0.95rem;
                border-radius: var(--radius-md);
            }

            .article-body h2 {
                font-size: 1.2rem;
            }

            .article-body h3 {
                font-size: 1.05rem;
            }

            .data-highlight-bar {
                grid-template-columns: repeat(2, 1fr);
                gap: 8px;
                padding: 12px 10px;
                border-radius: var(--radius-md);
            }

            .data-highlight-bar .data-value {
                font-size: 1.2rem;
            }

            .data-highlight-bar .data-label {
                font-size: 0.72rem;
            }

            .breadcrumb {
                font-size: 0.8rem;
                margin-bottom: 14px;
            }

            .site-footer {
                padding: 16px 16px;
            }

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

            .footer-links {
                justify-content: center;
                gap: 14px;
            }

            .article-bottom-bar {
                flex-direction: column;
                align-items: flex-start;
                gap: 10px;
                padding: 14px 16px;
            }
        }

        @media (max-width: 520px) {
            .sidebar {
                width: 85vw;
                min-width: 85vw;
                max-width: 300px;
            }

            .main-content-inner {
                padding: 14px 10px 24px 10px;
            }

            .article-hero {
                aspect-ratio: 4/3;
                min-height: 160px;
                margin-bottom: 18px;
            }

            .article-hero .hero-category-tag {
                top: 10px;
                left: 10px;
                font-size: 0.74rem;
                padding: 4px 10px;
            }

            .article-header h1 {
                font-size: 1.2rem;
            }

            .article-body {
                padding: 16px 12px;
                font-size: 0.9rem;
                line-height: 1.7;
            }

            .article-body blockquote {
                padding: 12px 14px;
                margin: 14px 0;
            }

            .data-highlight-bar {
                grid-template-columns: 1fr 1fr;
                gap: 6px;
                padding: 10px 8px;
            }

            .data-highlight-bar .data-value {
                font-size: 1.05rem;
            }

            .data-highlight-bar .data-label {
                font-size: 0.68rem;
            }

            .article-bottom-bar {
                padding: 12px;
                font-size: 0.85rem;
            }
        }