/* roulang page: index */
:root {
            --brand-cyan: #0EA5E9;
            --brand-green: #10B981;
            --brand-orange: #F97316;
            --brand-gradient: linear-gradient(135deg, #0EA5E9 0%, #10B981 100%);
            --brand-gradient-hover: linear-gradient(135deg, #0284C7 0%, #059669 100%);
            --bg-body: #F8FAFC;
            --bg-card: #FFFFFF;
            --bg-zebra: #F1F5F9;
            --bg-dark: #0F172A;
            --bg-dark-card: #1E293B;
            --text-dark: #0F172A;
            --text-slate: #475569;
            --text-muted: #64748B;
            --text-light: #F8FAFC;
            --border-color: #E2E8F0;
            --border-dark: #334155;
            --radius-xl: 24px;
            --radius-lg: 20px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --radius-pill: 9999px;
            --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
            --shadow-card: 0 4px 20px -2px rgba(15, 23, 42, 0.06);
            --shadow-hover: 0 16px 32px -4px rgba(14, 165, 233, 0.14);
            --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-body);
            color: var(--text-dark);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }

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

        a:hover, a:focus {
            color: var(--brand-cyan);
            text-decoration: none;
        }

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

        .site-container {
            max-width: 1240px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        /* 顶部公用栏 */
        .utility-bar {
            height: 40px;
            background: #F1F5F9;
            border-bottom: 1px solid var(--border-color);
            font-size: 13px;
            color: var(--text-muted);
            display: flex;
            align-items: center;
        }

        .utility-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
        }

        .status-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-weight: 500;
            color: var(--text-slate);
        }

        .pulse-dot {
            width: 8px;
            height: 8px;
            background-color: var(--brand-green);
            border-radius: 50%;
            box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
            animation: pulse-ring 2s infinite;
        }

        @keyframes pulse-ring {
            0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
            70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
            100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
        }

        .utility-links {
            display: flex;
            align-items: center;
            gap: 20px;
        }

        .utility-links span {
            color: var(--brand-cyan);
            font-weight: 600;
        }

        /* 主导航栏 */
        .main-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(226, 232, 240, 0.8);
            box-shadow: 0 2px 12px rgba(15, 23, 42, 0.03);
        }

        .nav-wrapper {
            height: 76px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
        }

        .brand-logo {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 20px;
            font-weight: 800;
            color: var(--text-dark);
            white-space: nowrap;
        }

        .brand-logo-icon {
            width: 36px;
            height: 36px;
            background: var(--brand-gradient);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #FFFFFF;
        }

        .search-container {
            flex: 1;
            max-width: 440px;
            position: relative;
        }

        .search-box {
            display: flex;
            align-items: center;
            background: #FFFFFF;
            border: 1.5px solid #CBD5E1;
            border-radius: var(--radius-pill);
            padding: 4px 6px 4px 16px;
            transition: var(--transition);
        }

        .search-box:focus-within {
            border-color: var(--brand-cyan);
            box-shadow: 0 0 0 4px rgba(14, 165, 233, 0.12);
        }

        .search-box input {
            border: none;
            box-shadow: none;
            background: transparent;
            margin: 0;
            font-size: 13.5px;
            color: var(--text-dark);
            outline: none;
            height: 32px;
            width: 100%;
        }

        .search-box input::placeholder {
            color: #94A3B8;
        }

        .search-btn {
            background: var(--brand-gradient);
            color: #fff;
            border: none;
            border-radius: var(--radius-pill);
            padding: 6px 14px;
            font-size: 13px;
            font-weight: 600;
            cursor: pointer;
            white-space: nowrap;
            transition: var(--transition);
        }

        .search-btn:hover {
            opacity: 0.95;
            transform: scale(1.02);
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 20px;
            white-space: nowrap;
        }

        .nav-item {
            font-size: 14.5px;
            font-weight: 600;
            color: var(--text-slate);
            padding: 8px 4px;
            position: relative;
        }

        .nav-item:hover, .nav-item.active {
            color: var(--brand-cyan);
        }

        .btn-gradient {
            background: var(--brand-gradient);
            color: #FFFFFF !important;
            padding: 10px 22px;
            border-radius: var(--radius-pill);
            font-weight: 600;
            font-size: 14px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            box-shadow: 0 4px 14px rgba(14, 165, 233, 0.25);
            transition: var(--transition);
            border: none;
            cursor: pointer;
        }

        .btn-gradient:hover {
            background: var(--brand-gradient-hover);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(14, 165, 233, 0.35);
        }

        .btn-outline {
            background: transparent;
            color: var(--text-dark);
            border: 1.5px solid #CBD5E1;
            padding: 10px 22px;
            border-radius: var(--radius-pill);
            font-weight: 600;
            font-size: 14px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            transition: var(--transition);
        }

        .btn-outline:hover {
            border-color: var(--brand-cyan);
            color: var(--brand-cyan);
            background: rgba(14, 165, 233, 0.04);
        }

        /* 统一卡片与徽章 */
        .card-large {
            background: var(--bg-card);
            border-radius: var(--radius-xl);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-card);
            padding: 32px;
            transition: var(--transition);
        }

Checking for the previous output's last character, I will directly continue the HTML document generation from that point to ensure continuity and prevent redundant information. The existing code's structure will guide the insertion of new content, adhering to proper HTML syntax and ensuring the final output forms a complete, valid webpage.


Initial structure focuses on implementing the data-driven flow as specified, ensuring the correct sequence of sections within the `<main>` element. The goal is to provide a comprehensive and complete implementation by including all 17 specified sections, although a minimum of 10-20 are required. Background and cover images will be integrated into the layout.


```html
                /* Badges */
                .badge {
                    display: inline-block;
                    padding: 4px 8px;
                    border-radius: var(--radius-sm);
                    font-size: 0.8em;
                    font-weight: bold;
                    margin-right: 8px;
                }
                .badge-primary {
                    background-color: var(--primary);
                    color: var(--text-light);
                }
                /* Sections */
                section {
                    margin-bottom: 48px;
                }
                /* Grids (Responsive) */
                .grid {
                    display: grid;
                    grid-template-columns: 1fr;
                    gap: 24px;
                }
                @media (min-width: 768px) {
                    .grid-2 {
                        grid-template-columns: repeat(2, 1fr);
                    }
                }
                @media (min-width: 1024px) {
                    .grid-3 {
                        grid-template-columns: repeat(3, 1fr);
                    }
                }
                /* Buttons */
                .btn {
                    display: inline-block;
                    padding: 12px 24px;
                    border-radius: var(--radius-md);
                    font-size: 1em;
                    font-weight: bold;
                    text-decoration: none;
                    text-align: center;
                    cursor: pointer;
                    transition: var(--transition);
                }
                .btn-primary {
                    background-color: var(--primary);
                    color: var(--text-light);
                }
                .btn-primary:hover {
                    opacity: 0.8;
                }
                /* Accordions */
                .accordion {
                    border: 1px solid var(--border-color);
                    border-radius: var(--radius-md);
                    overflow: hidden;
                    margin-bottom: 24px;
                }
                .accordion-item {
                    border-bottom: 1px solid var(--border-color);
                }
                .accordion-item:last-child {
                    border-bottom: none;
                }
                .accordion-header {
                    background-color: var(--bg-secondary);
                    padding: 16px;
                    cursor: pointer;
                    display: flex;
                    justify-content: space-between;
                    align-items: center;
                    font-weight: bold;
                    transition: background-color var(--transition);
                }
                .accordion-header:hover {
                    background-color: var(--bg-hover);
                }
                .accordion-content {
                    padding: 16px;
                    display: none;
                }
                .accordion-item.active .accordion-content {
                    display: block;
                }
                /* Dark Theme */
                body.dark {
                    --bg-primary: #1e1e1e;
                    --bg-secondary: #282828;
                    --bg-card: #333333;
                    --bg-hover: #444444;
                    --text-primary: #f0f0f0;
                    --text-secondary: #cccccc;
                    --text-light: #ffffff;
                    --border-color: #555555;
                    --shadow-card: 0 4px 8px rgba(0, 0, 0, 0.4);
                }