/* roulang page: index */
:root {
            --primary: #5B21B6;
            --primary-light: #7C3AED;
            --primary-dark: #4C1D95;
            --secondary: #06B6D4;
            --secondary-dark: #0891B2;
            --accent: #F97316;
            --accent-green: #10B981;
            --bg-base: #F8FAFC;
            --bg-surface: #FFFFFF;
            --bg-subtle: #F1F5F9;
            --text-main: #0F172A;
            --text-muted: #475569;
            --text-light: #94A3B8;
            --border-color: #E2E8F0;
            --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
            --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
            --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
            --shadow-hover: 0 20px 25px -5px rgba(91, 33, 182, 0.12), 0 8px 10px -6px rgba(91, 33, 182, 0.08);
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-full: 9999px;
            --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* Base Reset */
        * { box-sizing: border-box; }
        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            background-color: var(--bg-base);
            color: var(--text-main);
            line-height: 1.65;
            margin: 0;
            padding: 0;
            -webkit-font-smoothing: antialiased;
        }

        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--primary-light); }
        img { max-width: 100%; height: auto; display: block; }
        h1, h2, h3, h4, h5, h6 { color: var(--text-main); font-weight: 700; line-height: 1.3; margin: 0 0 0.5rem; }

        /* Site Header & Two-Tier Navigation */
        .site-header {
            background-color: var(--bg-surface);
            border-bottom: 1px solid var(--border-color);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow-sm);
        }
        .header-top-bar {
            padding: 0.75rem 0;
            border-bottom: 1px solid rgba(226, 232, 240, 0.6);
        }
        .brand-logo {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -0.5px;
        }
        .brand-logo i {
            color: var(--accent);
            font-size: 1.5rem;
        }
        .search-box-wrap {
            position: relative;
            max-width: 460px;
            margin: 0 auto;
        }
        .search-box-wrap input {
            width: 100%;
            padding: 0.55rem 1rem 0.55rem 2.5rem;
            border-radius: var(--radius-full);
            border: 1px solid var(--border-color);
            background: var(--bg-subtle);
            font-size: 0.875rem;
            margin-bottom: 0;
            height: auto;
            transition: var(--transition);
        }
        .search-box-wrap input:focus {
            background: #fff;
            border-color: var(--primary-light);
            box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.15);
        }
        .search-box-wrap i {
            position: absolute;
            left: 1rem;
            top: 50%;
            transform: translateY(-50%);
            color: var(--text-light);
            font-size: 0.875rem;
        }
        .btn-header-cta {
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            color: #fff !important;
            padding: 0.55rem 1.25rem;
            border-radius: var(--radius-full);
            font-size: 0.875rem;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 0.35rem;
            box-shadow: 0 2px 4px rgba(91, 33, 182, 0.2);
        }
        .btn-header-cta:hover {
            transform: translateY(-1px);
            box-shadow: 0 4px 8px rgba(91, 33, 182, 0.3);
        }

        /* Second Tier Tabs */
        .sub-bar-tabs {
            padding: 0.4rem 0;
            background: var(--bg-surface);
            overflow-x: auto;
            white-space: nowrap;
            scrollbar-width: none;
        }
        .sub-bar-tabs::-webkit-scrollbar { display: none; }
        .tabs-list {
            display: inline-flex;
            gap: 0.5rem;
            padding: 0;
            margin: 0;
            list-style: none;
        }
        .tab-pill {
            padding: 0.35rem 0.95rem;
            border-radius: var(--radius-full);
            font-size: 0.85rem;
            color: var(--text-muted);
            font-weight: 500;
            background: transparent;
            transition: var(--transition);
        }
        .tab-pill:hover {
            background: var(--bg-subtle);
            color: var(--primary);
        }
        .tab-pill.active {
            background: rgba(91, 33, 182, 0.08);
            color: var(--primary);
            font-weight: 600;
        }

        /* Section Global Styles */
        .section-block {
            padding: 4.5rem 0;
            position: relative;
        }
        .section-block.bg-alt {
            background-color: var(--bg-surface);
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }
        .section-header {
            text-align: center;
            max-width: 780px;
            margin: 0 auto 3rem;
        }
        .section-header .section-tag {
            display: inline-block;
            background: rgba(91, 33, 182, 0.08);
            color: var(--primary);
            font-size: 0.75rem;
            font-weight: 700;
            padding: 0.25rem 0.75rem;
            border-radius: var(--radius-full);
            text-transform: uppercase;
            letter-spacing: 0.5px;
            margin-bottom: 0.75rem;
        }
        .section-header h2 {
            font-size: 2rem;
            color: var(--text-main);
            margin-bottom: 0.75rem;
        }
        .section-header p {
            color: var(--text-muted);
            font-size: 1rem;
            line-height: 1.7;
            margin: 0;
        }

        /* 1. Hero Section */
        .hero-section {
            background: radial-gradient(circle at top right, rgba(6, 182, 212, 0.08), transparent 40%),
                        radial-gradient(circle at bottom left, rgba(91, 33, 182, 0.06), transparent 50%),
                        var(--bg-surface);
            padding: 4.5rem 0 4rem;
            border-bottom: 1px solid var(--border-color);
        }
        .hero-content {
            max-width: 640px;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: #EEF2FF;
            color: var(--primary);
            padding: 0.35rem 0.85rem;
            border-radius: var(--radius-full);
            font-size: 0.8rem;
            font-weight: 600;
            margin-bottom: 1.25rem;
            border: 1px solid #E0E7FF;
        }
        .hero-badge span {
            display: inline-block;
            width: 8px;
            height: 8px;
            background: var(--accent-green);
            border-radius: 50%;
            box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.3);
        }
        .hero-title {
            font-size: 2.75rem;
            font-weight: 800;
            line-height: 1.18;
            letter-spacing: -0.02em;
            color: var(--text-main);
            margin-bottom: 1.25rem;
        }
        .hero-desc {
            font-size: 1.05rem;
            color: var(--text-muted);
            line-height: 1.75;
            margin-bottom: 2rem;
        }
        .hero-form-card {
            background: #fff;
            padding: 2rem;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-lg);
            border: 1px solid var(--border-color);
            position: relative;
        }
        .hero-form-card h3 {
            font-size: 1.25rem;
            margin-bottom: 1rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .hero-form-card .form-group {
            margin-bottom: 1rem;
        }
        .hero-form-card label {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text-muted);
            margin-bottom: 0.35rem;
            display: block;
        }
        .hero-form-card input, .hero-form-card select {
            width: 100%;
            padding: 0.65rem 0.85rem;
            border-radius: 8px;
            border: 1px solid var(--border-color);
            font-size: 0.9rem;
            margin-bottom: 0;
            height: auto;
            background-color: var(--bg-subtle);
        }
        .hero-form-btn {
            width: 100%;
            background: linear-gradient(135deg, var(--accent), #EA580C);
            color: #fff;
            border: none;
            padding: 0.85rem;
            border-radius: 8px;
            font-size: 1rem;
            font-weight: 700;
            cursor: pointer;
            box-shadow: 0 4px 10px rgba(249, 115, 22, 0.25);
            transition: var(--transition);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            margin-top: 1.25rem;
        }
        .hero-form-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 14px rgba(249, 115, 22, 0.35);
        }

        /* 2. Core Features Triple */
        .feature-card {
            background: var(--bg-surface);
            padding: 2.25rem 1.75rem;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            height: 100%;
        }
        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(91, 33, 182, 0.3);
        }
        .feature-icon-box {
            width: 54px;
            height: 54px;
            border-radius: var(--radius-md);
            background: rgba(91, 33, 182, 0.1);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            margin-bottom: 1.25rem;
        }
        .feature-card h3 {
            font-size: 1.2rem;
            margin-bottom: 0.65rem;
        }
        .feature-card p {
            font-size: 0.925rem;
            color: var(--text-muted);
            line-height: 1.65;
            margin-bottom: 0;
        }

        /* 3. Scenario Walkthrough */
        .scenario-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 1.5rem;
        }
        .scenario-item {
            background: var(--bg-surface);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 1.5rem;
            transition: var(--transition);
        }
        .scenario-item:hover {
            border-color: var(--secondary);
            box-shadow: var(--shadow-md);
        }
        .scenario-item .icon-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 1rem;
        }
        .scenario-item .icon-header i {
            font-size: 1.6rem;
            color: var(--secondary-dark);
        }
        .scenario-item .badge {
            background: #E0F2FE;
            color: #0369A1;
            font-size: 0.75rem;
            padding: 0.2rem 0.5rem;
            border-radius: 4px;
        }
        .scenario-item h3 {
            font-size: 1.1rem;
            margin-bottom: 0.5rem;
        }
        .scenario-item p {
            font-size: 0.875rem;
            color: var(--text-muted);
            margin: 0;
        }

        /* 4. Stats Proof Bar */
        .stats-banner {
            background: linear-gradient(135deg, var(--primary-dark), var(--primary));
            color: #fff;
            padding: 3rem 0;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-lg);
        }
        .stat-col {
            text-align: center;
            padding: 1rem;
            border-right: 1px solid rgba(255, 255, 255, 0.15);
        }
        .stat-col:last-child {
            border-right: none;
        }
        .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            line-height: 1;
            color: #38BDF8;
            margin-bottom: 0.5rem;
        }
        .stat-label {
            font-size: 0.95rem;
            color: #E2E8F0;
            font-weight: 500;
        }

        /* 5. Comparison Matrix */
        .comparison-table-wrap {
            background: var(--bg-surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            overflow: hidden;
            box-shadow: var(--shadow-md);
        }
        .comp-table {
            width: 100%;
            margin-bottom: 0;
            border-collapse: collapse;
        }
        .comp-table th, .comp-table td {
            padding: 1.15rem 1.5rem;
            border-bottom: 1px solid var(--border-color);
            font-size: 0.925rem;
        }
        .comp-table th {
            background: var(--bg-subtle);
            font-weight: 700;
            color: var(--text-main);
        }
        .comp-table tr:last-child td {
            border-bottom: none;
        }
        .comp-highlight {
            background: rgba(91, 33, 182, 0.03);
            color: var(--primary);
            font-weight: 600;
        }

        /* 6. Category Showcase */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 1.25rem;
        }
        .category-card {
            background: var(--bg-surface);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 1.5rem 1rem;
            text-align: center;
            transition: var(--transition);
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        .category-card:hover {
            border-color: var(--primary);
            transform: translateY(-3px);
            box-shadow: var(--shadow-md);
        }
        .category-card .cat-icon {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: #F3E8FF;
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.25rem;
            margin-bottom: 0.85rem;
        }
        .category-card h3 {
            font-size: 1rem;
            margin-bottom: 0.35rem;
        }
        .category-card p {
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-bottom: 0.75rem;
        }
        .category-card span.btn-text {
            font-size: 0.8rem;
            color: var(--primary);
            font-weight: 600;
        }

        /* 7. Live Evidence & Articles */
        .article-card {
            background: var(--bg-surface);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 1.5rem;
            box-shadow: var(--shadow-sm);
            height: 100%;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }
        .article-meta {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            font-size: 0.8rem;
            color: var(--text-light);
            margin-bottom: 0.65rem;
        }
        .article-meta .tag {
            background: #FEF3C7;
            color: #92400E;
            padding: 0.15rem 0.45rem;
            border-radius: 4px;
            font-weight: 600;
        }
        .article-card h3 {
            font-size: 1.1rem;
            margin-bottom: 0.65rem;
            line-height: 1.4;
        }
        .article-card p {
            font-size: 0.875rem;
            color: var(--text-muted);
            line-height: 1.6;
            margin-bottom: 1rem;
        }
        .article-card .btn-link {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 0.25rem;
        }

        /* 8. Network & GEO Routing */
        .routing-panel {
            background: #0F172A;
            color: #F8FAFC;
            border-radius: var(--radius-lg);
            padding: 3rem 2rem;
        }
        .routing-node-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 1.25rem;
            margin-top: 2rem;
        }
        .node-box {
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: var(--radius-md);
            padding: 1.25rem;
        }
        .node-box .node-title {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: #38BDF8;
        }
        .node-box .ping-badge {
            font-size: 0.75rem;
            color: #4ADE80;
            background: rgba(74, 222, 128, 0.15);
            padding: 0.15rem 0.45rem;
            border-radius: 4px;
        }
        .node-box p {
            font-size: 0.825rem;
            color: #94A3B8;
            margin: 0;
            line-height: 1.5;
        }

        /* 9. FAQ Accordion */
        .faq-item {
            background: var(--bg-surface);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            margin-bottom: 1rem;
            overflow: hidden;
        }
        .faq-question {
            padding: 1.25rem 1.5rem;
            font-size: 1.05rem;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            background: var(--bg-surface);
            color: var(--text-main);
        }
        .faq-question i {
            color: var(--primary);
            transition: var(--transition);
        }
        .faq-answer {
            padding: 0 1.5rem 1.25rem;
            color: var(--text-muted);
            font-size: 0.925rem;
            line-height: 1.7;
        }

        /* 10. Step-by-Step Guide */
        .step-card {
            background: var(--bg-surface);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 2rem 1.5rem;
            position: relative;
            text-align: center;
            height: 100%;
        }
        .step-number {
            width: 42px;
            height: 42px;
            background: var(--primary);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.15rem;
            font-weight: 800;
            margin: 0 auto 1.25rem;
            box-shadow: 0 4px 8px rgba(91, 33, 182, 0.25);
        }
        .step-card h3 {
            font-size: 1.15rem;
            margin-bottom: 0.5rem;
        }
        .step-card p {
            font-size: 0.875rem;
            color: var(--text-muted);
            margin: 0;
        }

        /* 11. Interactive Playback Features */
        .interactive-box {
            background: var(--bg-surface);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 2.5rem;
            box-shadow: var(--shadow-md);
        }
        .feature-bullet {
            display: flex;
            gap: 1rem;
            margin-bottom: 1.5rem;
        }
        .feature-bullet i {
            font-size: 1.25rem;
            color: var(--accent);
            margin-top: 0.2rem;
        }
        .feature-bullet h4 {
            font-size: 1.05rem;
            margin-bottom: 0.25rem;
        }
        .feature-bullet p {
            font-size: 0.875rem;
            color: var(--text-muted);
            margin: 0;
        }

        /* 12. Trust & Guarantee Bar */
        .guarantee-bar {
            background: #F0FDF4;
            border: 1px solid #BBF7D0;
            border-radius: var(--radius-lg);
            padding: 2.5rem 1.5rem;
            margin-top: 1rem;
        }
        .guarantee-item {
            text-align: center;
        }
        .guarantee-item i {
            font-size: 2rem;
            color: var(--accent-green);
            margin-bottom: 0.75rem;
        }
        .guarantee-item h4 {
            font-size: 1.05rem;
            margin-bottom: 0.35rem;
            color: #166534;
        }
        .guarantee-item p {
            font-size: 0.825rem;
            color: #15803D;
            margin: 0;
        }

        /* 13. Floating Action Dock */
        .floating-action-dock {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            background: rgba(15, 23, 42, 0.95);
            backdrop-filter: blur(8px);
            color: #fff;
            padding: 0.85rem 1rem;
            z-index: 999;
            box-shadow: 0 -4px 12px rgba(0,0,0,0.15);
            border-top: 1px solid rgba(255,255,255,0.1);
        }
        .dock-container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 1rem;
        }
        .dock-text {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            font-size: 0.925rem;
        }
        .dock-text .live-dot {
            width: 10px;
            height: 10px;
            background: #EF4444;
            border-radius: 50%;
            display: inline-block;
            box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.3);
        }
        .dock-cta {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: linear-gradient(135deg, var(--accent), #EA580C);
            color: #fff;
            padding: 0.5rem 1.25rem;
            border-radius: var(--radius-full);
            font-size: 0.875rem;
            font-weight: 700;
        }
        .dock-cta:hover {
            color: #fff;
            transform: scale(1.03);
        }

        /* Site Footer */
        .site-footer {
            background-color: #0F172A;
            color: #94A3B8;
            padding: 4rem 0 5rem;
            font-size: 0.875rem;
            border-top: 1px solid #1E293B;
        }
        .footer-logo {
            color: #F8FAFC;
            font-size: 1.35rem;
            font-weight: 800;
            margin-bottom: 1rem;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
        }
        .footer-logo i { color: var(--accent); }
        .footer-nav-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-nav-list li { margin-bottom: 0.5rem; }
        .footer-nav-list a { color: #94A3B8; }
        .footer-nav-list a:hover { color: #38BDF8; }
        .footer-bottom {
            margin-top: 3rem;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            text-align: center;
            font-size: 0.8rem;
        }

        /* Responsive Breakpoints */
        @media screen and (max-width: 1024px) {
            .hero-title { font-size: 2.25rem; }
            .section-header h2 { font-size: 1.75rem; }
            .stat-col { border-right: none; border-bottom: 1px solid rgba(255, 255, 255, 0.15); margin-bottom: 1rem; }
        }
        @media screen and (max-width: 640px) {
            .hero-section { padding: 2.5rem 0; }
            .hero-title { font-size: 1.85rem; }
            .section-block { padding: 3rem 0; }
            .dock-container { justify-content: center; text-align: center; }
        }