/* roulang page: index */
:root {
            --bg-base: #070b19;
            --bg-surface: #0a1128;
            --bg-card: rgba(15, 23, 42, 0.72);
            --bg-card-hover: rgba(30, 41, 59, 0.85);
            --primary: #0066ff;
            --primary-light: #0ea5e9;
            --primary-glow: rgba(0, 102, 255, 0.45);
            --accent-cyan: #00f2fe;
            --accent-emerald: #10b981;
            --text-main: #f8fafc;
            --text-muted: #94a3b8;
            --text-dim: #64748b;
            --border-glass: rgba(255, 255, 255, 0.08);
            --border-glass-hover: rgba(14, 165, 233, 0.35);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 22px;
            --container-max: 1200px;
            --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        }

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

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

        body {
            background: radial-gradient(circle at 50% 0%, #0d1b3e 0%, var(--bg-base) 65%);
            min-height: 100vh;
            overflow-x: hidden;
        }

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

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

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

        .container {
            width: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* 顶部辅助服务条 */
        .top-bar {
            background-color: rgba(7, 11, 25, 0.95);
            border-bottom: 1px solid var(--border-glass);
            font-size: 13px;
            color: var(--text-muted);
            padding: 8px 0;
            position: relative;
            z-index: 60;
        }
        .top-bar-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
        }
        .top-bar-left, .top-bar-right {
            display: flex;
            align-items: center;
            gap: 20px;
        }
        .status-dot {
            display: inline-block;
            width: 8px;
            height: 8px;
            background: var(--accent-emerald);
            border-radius: 50%;
            margin-right: 6px;
            box-shadow: 0 0 8px var(--accent-emerald);
        }
        .badge-tag {
            background: rgba(14, 165, 233, 0.12);
            color: var(--accent-cyan);
            border: 1px solid rgba(14, 165, 233, 0.25);
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 12px;
        }

        /* 吸顶主导航 */
        .main-header {
            position: sticky;
            top: 0;
            z-index: 50;
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            background: rgba(10, 17, 40, 0.82);
            border-bottom: 1px solid var(--border-glass);
            transition: var(--transition);
        }
        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }
        .logo-wrap {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .logo-symbol {
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--primary), var(--accent-cyan));
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            font-weight: 900;
            color: #fff;
            box-shadow: 0 0 16px var(--primary-glow);
        }
        .logo-text {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            letter-spacing: -0.5px;
        }
        .logo-text span {
            color: var(--accent-cyan);
            font-size: 14px;
            font-weight: 400;
            display: block;
            margin-top: -2px;
        }
        .nav-links {
            display: flex;
            align-items: center;
            list-style: none;
            gap: 32px;
        }
        .nav-link {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-muted);
            padding: 8px 0;
            position: relative;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--text-main);
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, var(--primary), var(--accent-cyan));
            transition: var(--transition);
        }
        .nav-link:hover::after, .nav-link.active::after {
            width: 100%;
        }

        /* 统一发光按钮 */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 11px 24px;
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            border: 1px solid transparent;
            min-height: 44px;
            text-align: center;
        }
        .btn-primary {
            background: linear-gradient(135deg, #0052cc, #0066ff);
            color: #fff;
            box-shadow: 0 0 15px var(--primary-glow);
            border: 1px solid rgba(255, 255, 255, 0.2);
        }
        .btn-primary:hover {
            box-shadow: 0 0 25px rgba(0, 102, 255, 0.75);
            transform: translateY(-2px);
        }
        .btn-outline {
            background: rgba(15, 23, 42, 0.6);
            color: var(--text-main);
            border: 1px solid var(--border-glass-hover);
        }
        .btn-outline:hover {
            background: rgba(30, 41, 59, 0.8);
            border-color: var(--accent-cyan);
            color: #fff;
            transform: translateY(-2px);
        }
        .menu-toggle {
            display: none;
            background: none;
            border: 1px solid var(--border-glass);
            color: var(--text-main);
            padding: 8px 12px;
            border-radius: var(--radius-sm);
            font-size: 18px;
            cursor: pointer;
        }

        /* 板块公用结构 */
        section {
            padding: 96px 0;
            position: relative;
        }
        .section-header {
            text-align: center;
            max-width: 760px;
            margin: 0 auto 56px;
        }
        .section-tag {
            display: inline-block;
            color: var(--accent-cyan);
            font-size: 13px;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            margin-bottom: 12px;
            background: rgba(0, 242, 254, 0.08);
            padding: 4px 14px;
            border-radius: 20px;
            border: 1px solid rgba(0, 242, 254, 0.2);
        }
        .section-title {
            font-size: 34px;
            font-weight: 800;
            line-height: 1.3;
            margin-bottom: 18px;
            color: var(--text-main);
        }
        .section-desc {
            font-size: 15px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* 卡片公用样式 (玻璃拟态) */
        .glass-card {
            background: var(--bg-card);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            padding: 28px;
            transition: var(--transition);
        }
        .glass-card:hover {
            border-color: var(--border-glass-hover);
            transform: translateY(-4px);
            box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4), 0 0 20px rgba(14, 165, 233, 0.15);
        }

        /* 1. Hero 板块 */
        #hero {
            padding: 60px 0 100px;
            background: linear-gradient(180deg, rgba(13, 27, 62, 0.4) 0%, rgba(7, 11, 25, 0.9) 100%),
                        url('/assets/images/925d2d24b963483f.webp') center/cover no-repeat;
            position: relative;
            overflow: hidden;
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 1.15fr 0.85fr;
            gap: 48px;
            align-items: center;
        }
        .hero-content h1 {
            font-size: 46px;
            line-height: 1.22;
            font-weight: 800;
            color: #fff;
            margin-bottom: 22px;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
        }
        .hero-content h1 .gradient-text {
            background: linear-gradient(135deg, #38bdf8, #00f2fe);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .hero-p {
            font-size: 16px;
            line-height: 1.8;
            color: #cbd5e1;
            margin-bottom: 36px;
            max-width: 620px;
        }
        .hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .hero-search-box {
            background: rgba(15, 23, 42, 0.85);
            backdrop-filter: blur(16px);
            border: 1px solid rgba(14, 165, 233, 0.28);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6), 0 0 25px rgba(0, 102, 255, 0.2);
            border-radius: var(--radius-lg);
            padding: 32px;
        }
        .hero-search-box h2 {
            font-size: 20px;
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .hero-search-box p {
            font-size: 13px;
            color: var(--text-dim);
            margin-bottom: 24px;
        }
        .form-group {
            margin-bottom: 16px;
        }
        .form-group label {
            display: block;
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 6px;
        }
        .form-control {
            width: 100%;
            background: rgba(7, 11, 25, 0.7);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-sm);
            padding: 12px 14px;
            color: #fff;
            font-size: 14px;
            transition: var(--transition);
        }
        .form-control:focus {
            border-color: var(--accent-cyan);
            box-shadow: 0 0 10px rgba(0, 242, 254, 0.2);
        }
        .time-slots-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 8px;
            margin-top: 8px;
        }
        .slot-btn {
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid var(--border-glass);
            color: var(--text-muted);
            font-size: 12px;
            padding: 6px;
            border-radius: 6px;
            cursor: pointer;
            text-align: center;
            transition: var(--transition);
        }
        .slot-btn.active, .slot-btn:hover {
            background: rgba(0, 102, 255, 0.2);
            border-color: var(--primary-light);
            color: #fff;
        }

        /* 2. Platform Intro / #about */
        #about {
            background: var(--bg-surface);
            border-top: 1px solid var(--border-glass);
            border-bottom: 1px solid var(--border-glass);
        }
        .intro-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 56px;
            align-items: center;
        }
        .intro-visual {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border-glass-hover);
        }
        .intro-badges {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
            margin-top: 28px;
        }
        .cert-card {
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid var(--border-glass);
            padding: 16px;
            border-radius: var(--radius-sm);
        }
        .cert-title {
            font-size: 14px;
            font-weight: 700;
            color: var(--accent-cyan);
            margin-bottom: 6px;
        }
        .cert-card p {
            font-size: 13px;
            color: var(--text-dim);
            line-height: 1.5;
        }

        /* 3. Core Advantages / #advantages */
        .advantage-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .adv-icon {
            width: 48px;
            height: 48px;
            background: rgba(0, 102, 255, 0.15);
            border: 1px solid rgba(0, 102, 255, 0.3);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            color: var(--accent-cyan);
            margin-bottom: 20px;
            box-shadow: 0 0 16px rgba(0, 102, 255, 0.2);
        }
        .adv-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
            color: #fff;
        }
        .adv-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* 4. Hot Solutions / #solutions */
        #solutions {
            background: radial-gradient(circle at 80% 20%, rgba(14, 165, 233, 0.06), transparent 50%), var(--bg-surface);
        }
        .solutions-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .sol-card {
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            position: relative;
        }
        .sol-tag {
            font-size: 12px;
            padding: 3px 10px;
            border-radius: 4px;
            background: rgba(16, 185, 129, 0.15);
            color: var(--accent-emerald);
            border: 1px solid rgba(16, 185, 129, 0.3);
            display: inline-block;
            margin-bottom: 16px;
        }
        .sol-card h3 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .sol-features {
            list-style: none;
            margin: 20px 0 28px;
        }
        .sol-features li {
            font-size: 13px;
            color: var(--text-muted);
            padding: 8px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.04);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .sol-features li::before {
            content: '✓';
            color: var(--accent-cyan);
            font-weight: bold;
        }

        /* 5. Philosophy & Infrastructure / #architecture */
        #architecture {
            background: #040711;
            border-top: 1px solid var(--border-glass);
            border-bottom: 1px solid var(--border-glass);
        }
        .arch-box {
            background: rgba(11, 19, 43, 0.6);
            border: 1px solid rgba(0, 102, 255, 0.25);
            border-radius: var(--radius-lg);
            padding: 44px;
            box-shadow: 0 0 35px rgba(0, 102, 255, 0.12);
        }
        .arch-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            margin-top: 36px;
        }
        .arch-item {
            border-left: 2px solid var(--accent-cyan);
            padding-left: 18px;
        }
        .arch-item h4 {
            font-size: 16px;
            color: #fff;
            margin-bottom: 8px;
        }
        .arch-item p {
            font-size: 13px;
            color: var(--text-dim);
            line-height: 1.6;
        }

        /* 6. Process & Demo / #workflow */
        .process-flow {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
        }
        .process-card {
            position: relative;
            background: rgba(15, 23, 42, 0.6);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            padding: 24px;
        }
        .step-num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--accent-cyan));
            color: #fff;
            font-weight: 700;
            font-size: 14px;
            margin-bottom: 14px;
        }
        .process-card h4 {
            font-size: 17px;
            margin-bottom: 10px;
            color: #fff;
        }
        .process-card p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.6;
        }
        .process-timing {
            margin-top: 14px;
            font-size: 12px;
            color: var(--accent-emerald);
            background: rgba(16, 185, 129, 0.1);
            padding: 4px 8px;
            border-radius: 4px;
            display: inline-block;
        }

        /* 7. Case Studies / #cases */
        #cases {
            background: var(--bg-surface);
        }
        .case-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
        }
        .case-card {
            display: grid;
            grid-template-columns: 1fr 1.2fr;
            background: var(--bg-card);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            overflow: hidden;
        }
        .case-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .case-body {
            padding: 28px;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }
        .case-body h3 {
            font-size: 18px;
            color: #fff;
            margin-bottom: 10px;
        }
        .case-body p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.6;
            margin-bottom: 16px;
        }
        .metric-badge-group {
            display: flex;
            gap: 12px;
        }
        .metric-badge {
            background: rgba(0, 102, 255, 0.12);
            border: 1px solid rgba(0, 102, 255, 0.25);
            padding: 6px 12px;
            border-radius: 6px;
            font-size: 12px;
            color: var(--accent-cyan);
        }

        /* 8. Metric Counters / #metrics */
        #metrics {
            padding: 60px 0;
            background: linear-gradient(180deg, #070b19 0%, #0c1735 100%);
            border-top: 1px solid var(--border-glass);
            border-bottom: 1px solid var(--border-glass);
        }
        .metrics-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .metric-item {
            text-align: center;
            background: rgba(15, 23, 42, 0.5);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            padding: 30px 16px;
        }
        .metric-val {
            font-size: 40px;
            font-weight: 800;
            color: #fff;
            line-height: 1;
            margin-bottom: 8px;
            background: linear-gradient(135deg, #ffffff, var(--accent-cyan));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .metric-lbl {
            font-size: 14px;
            color: var(--text-muted);
        }

        /* 9. Reviews / #reviews */
        .reviews-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .review-card {
            background: var(--bg-card);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            padding: 24px;
        }
        .review-stars {
            color: #f59e0b;
            font-size: 14px;
            margin-bottom: 12px;
        }
        .review-text {
            font-size: 14px;
            color: #cbd5e1;
            line-height: 1.7;
            margin-bottom: 18px;
        }
        .review-author {
            display: flex;
            align-items: center;
            gap: 12px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            padding-top: 14px;
        }
        .author-info h5 {
            font-size: 14px;
            color: #fff;
        }
        .author-info span {
            font-size: 12px;
            color: var(--text-dim);
        }

        /* 10. News & Guides / #news */
        #news {
            background: var(--bg-surface);
        }
        .news-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .news-card {
            background: var(--bg-card);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            overflow: hidden;
            display: flex;
            flex-direction: column;
        }
        .news-img-box {
            height: 180px;
            overflow: hidden;
        }
        .news-img-box img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .news-card:hover .news-img-box img {
            transform: scale(1.05);
        }
        .news-content {
            padding: 22px;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }
        .news-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 12px;
            color: var(--text-dim);
            margin-bottom: 10px;
        }
        .news-title {
            font-size: 16px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 10px;
            line-height: 1.4;
        }
        .news-desc {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* 11. FAQ Accordion / #faq */
        .faq-wrap {
            max-width: 860px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-sm);
            margin-bottom: 14px;
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item[open] {
            border-color: rgba(14, 165, 233, 0.4);
            background: rgba(15, 23, 42, 0.9);
        }
        .faq-header {
            padding: 18px 22px;
            font-size: 15px;
            font-weight: 600;
            color: #fff;
            cursor: pointer;
            list-style: none;
            display: flex;
            align-items: center;
            justify-content: space-between;
            user-select: none;
        }
        .faq-header::-webkit-details-marker {
            display: none;
        }
        .faq-header::after {
            content: '+';
            font-size: 20px;
            color: var(--accent-cyan);
            transition: var(--transition);
        }
        .faq-item[open] .faq-header::after {
            content: '−';
        }
        .faq-body {
            padding: 0 22px 20px;
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
            border-top: 1px solid rgba(255, 255, 255, 0.04);
            padding-top: 14px;
        }

        /* 12. Final CTA / #contact */
        #contact {
            background: radial-gradient(circle at 50% 50%, rgba(0, 102, 255, 0.15) 0%, #070b19 75%);
            border-top: 1px solid var(--border-glass);
            padding: 80px 0;
        }
        .cta-card {
            background: rgba(15, 23, 42, 0.75);
            backdrop-filter: blur(16px);
            border: 1px solid rgba(14, 165, 233, 0.3);
            border-radius: var(--radius-lg);
            padding: 48px;
            box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
            max-width: 900px;
            margin: 0 auto;
        }
        .cta-form-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
            margin: 28px 0;
        }

        /* 页脚 */
        .main-footer {
            background: #040711;
            border-top: 1px solid var(--border-glass);
            padding: 70px 0 30px;
            font-size: 14px;
            color: var(--text-muted);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 0.9fr 0.9fr 1fr;
            gap: 40px;
            margin-bottom: 50px;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 16px;
            margin-bottom: 20px;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        .footer-links a:hover {
            color: var(--accent-cyan);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 13px;
            color: var(--text-dim);
            flex-wrap: wrap;
            gap: 12px;
        }

        /* 响应式断点 */
        @media (max-width: 1024px) {
            .hero-grid, .intro-grid, .case-grid {
                grid-template-columns: 1fr;
            }
            .advantage-grid, .solutions-grid, .process-flow, .metrics-grid, .reviews-grid, .news-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .arch-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .cta-form-grid {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }
            .menu-toggle {
                display: block;
            }
            .section-title {
                font-size: 26px;
            }
            .hero-content h1 {
                font-size: 32px;
            }
            .advantage-grid, .solutions-grid, .process-flow, .metrics-grid, .reviews-grid, .news-grid, .arch-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .case-card {
                grid-template-columns: 1fr;
            }
            .top-bar {
                display: none;
            }
        }