/* roulang page: index */
:root {
            --primary: #1A365D;
            --primary-dark: #0F172A;
            --primary-light: #2B6CB0;
            --accent: #0D9488;
            --accent-orange: #EA580C;
            --accent-hover: #0F766E;
            --bg-body: #F8FAFC;
            --bg-card: #FFFFFF;
            --text-main: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --border-color: #E2E8F0;
            --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
            --shadow-card: 0 4px 20px -2px rgba(15, 23, 42, 0.05), 0 2px 6px -1px rgba(15, 23, 42, 0.02);
            --shadow-hover: 0 12px 28px -4px rgba(15, 23, 42, 0.12), 0 4px 10px -2px rgba(15, 23, 42, 0.04);
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-full: 9999px;
            --transition: all 0.25s ease;
        }

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

        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }

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

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

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

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* 顶部微型信息条与主导航 */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: #ffffff;
            box-shadow: 0 1px 4px rgba(15, 23, 42, 0.08);
        }

        .top-info-bar {
            background-color: #F1F5F9;
            font-size: 0.8125rem;
            color: var(--text-muted);
            border-bottom: 1px solid var(--border-color);
            padding: 6px 0;
        }

        .top-info-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .top-info-badges {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .top-dot-indicator {
            display: inline-block;
            width: 8px;
            height: 8px;
            background-color: #10B981;
            border-radius: 50%;
            margin-right: 6px;
        }

        .main-nav {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }

        .brand-logo {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 10px;
            letter-spacing: -0.5px;
        }

        .brand-logo svg {
            width: 32px;
            height: 32px;
            fill: var(--accent);
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 24px;
            list-style: none;
        }

        .nav-links a {
            font-size: 0.9375rem;
            font-weight: 500;
            color: var(--text-body);
            padding: 8px 4px;
            position: relative;
        }

        .nav-links a:hover, .nav-links a.active {
            color: var(--primary);
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--accent);
            transition: var(--transition);
        }

        .nav-links a:hover::after, .nav-links a.active::after {
            width: 100%;
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        /* 移动端菜单触发器 */
        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
        }

        .mobile-toggle span {
            display: block;
            width: 24px;
            height: 2px;
            background-color: var(--text-main);
            margin: 5px 0;
            transition: var(--transition);
        }

        /* 通用按钮规范 */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 10px 22px;
            font-size: 0.9375rem;
            font-weight: 600;
            border-radius: 8px;
            cursor: pointer;
            transition: var(--transition);
            border: 1px solid transparent;
            min-height: 44px;
            white-space: nowrap;
        }

        .btn-primary {
            background-color: var(--accent);
            color: #ffffff;
        }

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

        .btn-outline {
            border-color: var(--border-color);
            background-color: #ffffff;
            color: var(--text-main);
        }

        .btn-outline:hover {
            border-color: var(--accent);
            color: var(--accent);
        }

        .btn-orange {
            background-color: var(--accent-orange);
            color: #ffffff;
        }

        .btn-orange:hover {
            background-color: #C2410C;
        }

        /* 全局通用区块排版 */
        .section-block {
            padding: 80px 0;
            position: relative;
        }

        .section-alt {
            background-color: #F1F5F9;
        }

        .section-dark {
            background-color: var(--primary-dark);
            color: #FFFFFF;
        }

        .section-header {
            margin-bottom: 48px;
        }

        .section-header.text-center {
            text-align: center;
            max-width: 760px;
            margin-left: auto;
            margin-right: auto;
        }

        .badge-tag {
            display: inline-block;
            font-size: 0.8125rem;
            font-weight: 600;
            color: var(--accent);
            background-color: rgba(13, 148, 136, 0.1);
            padding: 4px 12px;
            border-radius: var(--radius-full);
            margin-bottom: 12px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .badge-orange {
            color: var(--accent-orange);
            background-color: rgba(234, 88, 12, 0.1);
        }

        .section-title {
            font-size: 2.125rem;
            font-weight: 700;
            color: var(--text-main);
            line-height: 1.3;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }

        .section-dark .section-title {
            color: #FFFFFF;
        }

        .section-desc {
            font-size: 1.0625rem;
            color: var(--text-muted);
            line-height: 1.7;
        }

        .section-dark .section-desc {
            color: #94A3B8;
        }

        /* 1. 全宽浅色矮横幅 Hero */
        .hero-banner {
            position: relative;
            background: linear-gradient(135deg, rgba(26, 54, 93, 0.03) 0%, rgba(13, 148, 136, 0.06) 100%), #FFFFFF;
            padding: 60px 0;
            border-bottom: 1px solid var(--border-color);
            overflow: hidden;
        }

        .hero-grid {
            display: grid;
            grid-template-columns: 1.3fr 0.9fr;
            align-items: center;
            gap: 40px;
        }

        .hero-banner h1 {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.25;
            margin-bottom: 18px;
            letter-spacing: -0.8px;
        }

        .hero-lead {
            font-size: 1.0625rem;
            color: var(--text-body);
            line-height: 1.75;
            margin-bottom: 30px;
        }

        .hero-cta-group {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        .hero-banner-visual {
            position: relative;
        }

        .hero-visual-card {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 20px;
            box-shadow: var(--shadow-card);
            position: relative;
        }

        .hero-visual-card img {
            border-radius: var(--radius-md);
            width: 100%;
            height: 240px;
            object-fit: cover;
        }

        .hero-status-pill {
            position: absolute;
            bottom: 36px;
            right: 36px;
            background: rgba(15, 23, 42, 0.85);
            backdrop-filter: blur(8px);
            color: #FFFFFF;
            padding: 8px 16px;
            border-radius: var(--radius-full);
            font-size: 0.8125rem;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        /* 2. 多语言赛事覆盖轨道 (#coverage) */
        .coverage-strip {
            padding: 32px 0;
            background-color: #FFFFFF;
            border-bottom: 1px solid var(--border-color);
        }

        .lang-pills-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
        }

        .lang-pill-item {
            display: flex;
            align-items: center;
            gap: 8px;
            background: var(--bg-body);
            border: 1px solid var(--border-color);
            padding: 8px 16px;
            border-radius: var(--radius-full);
            font-size: 0.875rem;
            font-weight: 500;
            color: var(--text-body);
        }

        .lang-pill-item span.code {
            font-weight: 700;
            color: var(--accent);
            text-transform: uppercase;
        }

        /* 3. 架构与性能概览 (#overview) */
        .overview-layout {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }

        .overview-graphic {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
        }

        .overview-graphic img {
            width: 100%;
            height: 380px;
            object-fit: cover;
        }

        .overview-points {
            list-style: none;
            margin-top: 24px;
            display: grid;
            gap: 16px;
        }

        .overview-point-item {
            display: flex;
            gap: 14px;
        }

        .point-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            background: rgba(13, 148, 136, 0.12);
            color: var(--accent);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 0.875rem;
        }

        /* 4. 核心技术优势卡片 (#features) */
        .cards-grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .feature-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 32px 28px;
            box-shadow: var(--shadow-card);
            transition: var(--transition);
        }

        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(13, 148, 136, 0.3);
        }

        .feature-icon-wrapper {
            width: 48px;
            height: 48px;
            border-radius: 10px;
            background: rgba(26, 54, 93, 0.06);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.25rem;
            margin-bottom: 20px;
        }

        .feature-card h3 {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 12px;
        }

        .feature-card p {
            font-size: 0.9375rem;
            color: var(--text-muted);
            line-height: 1.65;
        }

        /* 5. 热门赛事应用场景与形态 (#products) */
        .scene-card {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            display: flex;
            flex-direction: column;
            transition: var(--transition);
        }

        .scene-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }

        .scene-card-body {
            padding: 28px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .scene-card h3 {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 12px;
        }

        .scene-card p {
            font-size: 0.9375rem;
            color: var(--text-muted);
            margin-bottom: 20px;
            line-height: 1.6;
        }

        .scene-feature-list {
            list-style: none;
            margin-top: auto;
            border-top: 1px solid var(--border-color);
            padding-top: 16px;
            font-size: 0.875rem;
            color: var(--text-body);
        }

        .scene-feature-list li {
            position: relative;
            padding-left: 18px;
            margin-bottom: 8px;
        }

        .scene-feature-list li::before {
            content: '✓';
            position: absolute;
            left: 0;
            color: var(--accent);
            font-weight: bold;
        }

        /* 6. 深色网络与分发中枢 (#infrastructure) */
        .infra-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }

        .infra-metric-box {
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: var(--radius-md);
            padding: 24px;
            margin-bottom: 16px;
        }

        .infra-metric-box h4 {
            font-size: 1.125rem;
            color: #FFFFFF;
            margin-bottom: 8px;
        }

        .infra-metric-box p {
            font-size: 0.875rem;
            color: #94A3B8;
        }

        /* 7. 商业应用故事与案例 (#stories) */
        .story-container {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 40px;
            box-shadow: var(--shadow-card);
        }

        .story-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 40px;
            align-items: center;
        }

        .story-content h3 {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 16px;
        }

        .story-stats {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
            background: var(--bg-body);
            padding: 24px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
        }

        .story-stat-val {
            font-size: 1.75rem;
            font-weight: 800;
            color: var(--accent-orange);
            line-height: 1;
            margin-bottom: 6px;
        }

        .story-stat-lbl {
            font-size: 0.8125rem;
            color: var(--text-muted);
        }

        /* 8. 关键运营数据指标带 (#metrics) */
        .metrics-banner {
            background-color: #FFFFFF;
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
            padding: 48px 0;
        }

        .metrics-grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            text-align: center;
        }

        .metric-num {
            font-size: 2.75rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.1;
            margin-bottom: 8px;
            font-feature-settings: "tnum";
        }

        .metric-desc {
            font-size: 0.9375rem;
            color: var(--text-muted);
            font-weight: 500;
        }

        /* 9. 客户评价与同行口碑 (#testimonials) */
        .quote-card {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 28px;
            box-shadow: var(--shadow-card);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .quote-stars {
            color: #F59E0B;
            font-size: 1rem;
            margin-bottom: 14px;
            letter-spacing: 2px;
        }

        .quote-text {
            font-size: 0.9375rem;
            color: var(--text-body);
            line-height: 1.7;
            margin-bottom: 20px;
        }

        .quote-author {
            display: flex;
            align-items: center;
            gap: 12px;
            border-top: 1px solid var(--border-color);
            padding-top: 16px;
        }

        .author-avatar {
            width: 44px;
            height: 44px;
            background: #CBD5E1;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            color: #475569;
        }

        .author-name {
            font-size: 0.9375rem;
            font-weight: 700;
            color: var(--text-main);
        }

        .author-org {
            font-size: 0.8125rem;
            color: var(--text-muted);
        }

        /* 10. 技术动态与精选资讯 (#insights) */
        .insights-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .insight-card {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 20px;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }

        .insight-card:hover {
            box-shadow: var(--shadow-hover);
            border-color: var(--accent);
        }

        .insight-date {
            font-size: 0.75rem;
            color: var(--text-muted);
            margin-bottom: 8px;
        }

        .insight-title {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-main);
            line-height: 1.45;
            margin-bottom: 10px;
        }

        .insight-tag {
            display: inline-block;
            font-size: 0.6875rem;
            padding: 2px 8px;
            border-radius: 4px;
            background: #F1F5F9;
            color: var(--text-muted);
            font-weight: 600;
        }

        /* 11. 常见问题解答手风琴 (#faq) */
        .faq-wrapper {
            max-width: 860px;
            margin: 0 auto;
        }

        .faq-item {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            margin-bottom: 14px;
            overflow: hidden;
            box-shadow: var(--shadow-sm);
        }

        .faq-question {
            padding: 20px 24px;
            font-size: 1.0625rem;
            font-weight: 600;
            color: var(--text-main);
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            user-select: none;
        }

        .faq-question::after {
            content: '+';
            font-size: 1.35rem;
            font-weight: 400;
            color: var(--text-muted);
            transition: var(--transition);
        }

        .faq-item.active .faq-question::after {
            transform: rotate(45deg);
        }

        .faq-answer {
            padding: 0 24px 20px;
            font-size: 0.9375rem;
            color: var(--text-body);
            line-height: 1.7;
            display: none;
        }

        .faq-item.active .faq-answer {
            display: block;
        }

        /* 12. 企业级交付与服务保障 (#guarantee) */
        .guarantee-bar {
            background-color: #E2E8F0;
            padding: 40px 0;
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }

        .guarantee-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .guarantee-card {
            background: #FFFFFF;
            padding: 20px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .guarantee-icon {
            width: 40px;
            height: 40px;
            border-radius: 8px;
            background: rgba(13, 148, 136, 0.1);
            color: var(--accent);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.25rem;
            flex-shrink: 0;
        }

        .guarantee-title {
            font-size: 0.9375rem;
            font-weight: 700;
            color: var(--text-main);
        }

        .guarantee-sub {
            font-size: 0.8125rem;
            color: var(--text-muted);
        }

        /* 13. 底部主转化表单区 (#convert) */
        .convert-section {
            background: linear-gradient(135deg, var(--primary) 0%, #0F172A 100%);
            color: #FFFFFF;
            padding: 80px 0;
            text-align: center;
        }

        .convert-box {
            max-width: 720px;
            margin: 0 auto;
        }

        .convert-form {
            display: grid;
            grid-template-columns: repeat(3, 1fr) auto;
            gap: 12px;
            margin-top: 36px;
        }

        .convert-input {
            width: 100%;
            height: 48px;
            padding: 0 16px;
            border-radius: 8px;
            border: 1px solid rgba(255, 255, 255, 0.2);
            background: rgba(255, 255, 255, 0.08);
            color: #FFFFFF;
            font-size: 0.9375rem;
            outline: none;
            transition: var(--transition);
        }

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

        .convert-input:focus {
            border-color: var(--accent);
            background: rgba(255, 255, 255, 0.15);
        }

        /* 吸底固定悬浮转化条 */
        .sticky-bottom-bar {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            background: #FFFFFF;
            border-top: 1px solid var(--border-color);
            padding: 12px 0;
            box-shadow: 0 -4px 16px rgba(15, 23, 42, 0.08);
            z-index: 999;
            transform: translateY(100%);
            transition: transform 0.3s ease;
        }

        .sticky-bottom-bar.visible {
            transform: translateY(0);
        }

        .sticky-bar-content {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .sticky-info {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .sticky-close {
            background: none;
            border: none;
            font-size: 1.25rem;
            color: var(--text-muted);
            cursor: pointer;
            padding: 4px;
            line-height: 1;
            margin-left: 16px;
        }

        /* 统一页脚 */
        .site-footer {
            background-color: #0F172A;
            color: #94A3B8;
            padding-top: 64px;
            border-top: 1px solid #1E293B;
            font-size: 0.875rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 40px;
            margin-bottom: 48px;
        }

        .footer-brand {
            font-size: 1.25rem;
            font-weight: 700;
            color: #FFFFFF;
            margin-bottom: 16px;
        }

        .footer-col h4 {
            color: #FFFFFF;
            font-size: 1rem;
            margin-bottom: 18px;
        }

        .footer-links {
            list-style: none;
            display: grid;
            gap: 10px;
        }

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

        .footer-compliance-info {
            display: grid;
            gap: 8px;
            line-height: 1.6;
        }

        .footer-bottom {
            border-top: 1px solid #1E293B;
            padding: 24px 0;
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 0.8125rem;
        }

        /* 响应式断点控制 */
        @media (max-width: 1024px) {
            .cards-grid-3, .insights-grid, .guarantee-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .metrics-grid-4 {
                grid-template-columns: repeat(2, 1fr);
                gap: 32px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .mobile-toggle {
                display: block;
            }
            .nav-links {
                position: fixed;
                top: 72px;
                left: 0;
                right: 0;
                bottom: 0;
                background: #FFFFFF;
                flex-direction: column;
                padding: 32px 24px;
                gap: 20px;
                display: none;
                box-shadow: 0 16px 24px rgba(0, 0, 0, 0.1);
            }
            .nav-links.open {
                display: flex;
            }
            .hero-grid, .overview-layout, .infra-grid, .story-grid {
                grid-template-columns: 1fr;
            }
            .hero-banner h1 {
                font-size: 2rem;
            }
            .convert-form {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .footer-bottom {
                flex-direction: column;
                gap: 12px;
                text-align: center;
            }
            .sticky-bar-content {
                flex-direction: column;
                gap: 12px;
                align-items: flex-start;
            }
            .sticky-actions {
                width: 100%;
                display: flex;
                justify-content: space-between;
                align-items: center;
            }
        }

        @media (max-width: 520px) {
            .cards-grid-3, .insights-grid, .guarantee-grid, .metrics-grid-4 {
                grid-template-columns: 1fr;
            }
            .section-title {
                font-size: 1.625rem;
            }
        }