/* roulang page: index */
:root {
      --primary: #0052D9;
      --primary-hover: #003cab;
      --primary-light: #EBF3FF;
      --accent: #FF5C00;
      --success: #00A870;
      --dark: #0A1226;
      --dark-card: #152243;
      --text-main: #0F172A;
      --text-muted: #475569;
      --text-light: #94A3B8;
      --bg-main: #F8FAFC;
      --bg-alt: #FFFFFF;
      --border: #E2E8F0;
      --shadow-sm: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
      --shadow-lg: 0 20px 25px -5px rgba(15, 23, 42, 0.09), 0 10px 10px -5px rgba(15, 23, 42, 0.04);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --max-w: 1240px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Noto Sans", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-main);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
      display: flex;
      flex-direction: column;
      min-height: 100vh;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.25s ease;
    }

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

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

    .section-py {
      padding: 88px 0;
    }

    .section-header {
      text-align: center;
      max-width: 820px;
      margin: 0 auto 56px auto;
    }

    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      background: var(--primary-light);
      color: var(--primary);
      font-size: 13px;
      font-weight: 600;
      border-radius: 999px;
      margin-bottom: 14px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 34px;
      font-weight: 700;
      line-height: 1.35;
      color: var(--text-main);
      margin-bottom: 16px;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 顶部微型信息条与主导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
    }

    .top-bar {
      background: #0A1226;
      color: #94A3B8;
      font-size: 12px;
      padding: 7px 0;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }

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

    .top-status {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .status-dot {
      width: 8px;
      height: 8px;
      background-color: var(--success);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--success);
      display: inline-block;
    }

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

    .nav-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 20px;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
    }

    .nav-logo-icon {
      width: 34px;
      height: 34px;
      background: linear-gradient(135deg, var(--primary), #3b82f6);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: 900;
      font-size: 18px;
    }

    .nav-menu {
      display: flex;
      gap: 28px;
      list-style: none;
    }

    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      padding: 6px 2px;
      position: relative;
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 11px 24px;
      font-size: 15px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.25s ease;
      white-space: nowrap;
    }

    .btn-primary {
      background: var(--primary);
      color: #fff;
      box-shadow: 0 4px 12px rgba(0, 82, 217, 0.25);
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(0, 82, 217, 0.35);
    }

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

    .btn-secondary:hover {
      background: #F1F5F9;
      border-color: #cbd5e1;
    }

    .btn-accent {
      background: var(--accent);
      color: #fff;
      box-shadow: 0 4px 14px rgba(255, 92, 0, 0.25);
    }

    .btn-accent:hover {
      background: #e05200;
      transform: translateY(-2px);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--text-main);
    }

    /* 1. 首屏轮播与价值主张区 (#banner) */
    .hero-banner {
      position: relative;
      background: #0A1226;
      color: #fff;
      overflow: hidden;
      min-height: 620px;
      display: flex;
      align-items: center;
    }

    .hero-slide {
      position: absolute;
      inset: 0;
      opacity: 0;
      visibility: hidden;
      transition: opacity 0.8s ease, visibility 0.8s ease;
      display: flex;
      align-items: center;
      background-size: cover;
      background-position: center;
    }

    .hero-slide.active {
      opacity: 1;
      visibility: visible;
      position: relative;
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(10, 18, 38, 0.94) 0%, rgba(10, 18, 38, 0.8) 60%, rgba(10, 18, 38, 0.6) 100%);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 720px;
      padding: 72px 0;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: rgba(0, 82, 217, 0.35);
      border: 1px solid rgba(0, 82, 217, 0.8);
      color: #93c5fd;
      padding: 6px 14px;
      border-radius: 999px;
      font-size: 13px;
      margin-bottom: 22px;
    }

    .hero-title {
      font-size: 46px;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-desc {
      font-size: 17px;
      color: #cbd5e1;
      margin-bottom: 36px;
      line-height: 1.7;
    }

    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .hero-indicators {
      position: absolute;
      bottom: 24px;
      left: 50%;
      transform: translateX(-50%);
      display: flex;
      gap: 10px;
      z-index: 3;
    }

    .indicator-dot {
      width: 12px;
      height: 12px;
      border-radius: 50%;
      background: rgba(255,255,255,0.3);
      cursor: pointer;
      transition: all 0.3s;
    }

    .indicator-dot.active {
      width: 32px;
      border-radius: 6px;
      background: var(--primary);
    }

    .slider-arrow {
      position: absolute;
      top: 50%;
      transform: translateY(-50%);
      z-index: 3;
      background: rgba(0,0,0,0.4);
      color: #fff;
      border: 1px solid rgba(255,255,255,0.2);
      width: 44px;
      height: 44px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      transition: background 0.2s;
    }

    .slider-arrow:hover {
      background: var(--primary);
    }

    .slider-arrow.prev { left: 24px; }
    .slider-arrow.next { right: 24px; }

    /* 2. 平台定位与架构介绍区 (#intro) */
    .intro-grid {
      display: grid;
      grid-template-columns: 1.1fr 1fr;
      gap: 56px;
      align-items: center;
    }

    .intro-visual {
      background: #fff;
      border-radius: var(--radius-lg);
      padding: 24px;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
    }

    .intro-visual img {
      border-radius: var(--radius-md);
      object-fit: cover;
      width: 100%;
      height: 380px;
    }

    .spec-badge-group {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 24px;
    }

    .spec-item {
      background: #F1F5F9;
      border: 1px solid #E2E8F0;
      padding: 8px 16px;
      border-radius: 6px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
    }

    /* 3. 核心能力与功能分组矩阵 (#features) */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .feature-card {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 32px 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: #cbd5e1;
    }

    .feature-icon-box {
      width: 52px;
      height: 52px;
      background: var(--primary-light);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 20px;
    }

    .feature-card h3 {
      font-size: 19px;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .feature-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 4. 热门分发矩阵与产品套件 (#products) */
    .products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .product-card {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 36px 30px;
      display: flex;
      flex-direction: column;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s;
    }

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

    .product-card .tag {
      align-self: flex-start;
      font-size: 12px;
      font-weight: 600;
      padding: 4px 10px;
      border-radius: 4px;
      background: #F1F5F9;
      color: var(--text-muted);
      margin-bottom: 16px;
    }

    .product-card h3 {
      font-size: 21px;
      font-weight: 700;
      margin-bottom: 14px;
    }

    .product-card p {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 24px;
      flex-grow: 1;
      line-height: 1.65;
    }

    .product-specs {
      list-style: none;
      border-top: 1px solid var(--border);
      padding-top: 20px;
      margin-bottom: 28px;
    }

    .product-specs li {
      font-size: 13px;
      color: var(--text-main);
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .product-specs li::before {
      content: "✓";
      color: var(--primary);
      font-weight: 700;
    }

    /* 5. 深色对比模式：全链路技术架构与核心理念区 (#technology) */
    .tech-section {
      background: var(--dark);
      color: #fff;
    }

    .tech-section .section-title {
      color: #fff;
    }

    .tech-section .section-desc {
      color: var(--text-light);
    }

    .tech-pipeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 50px;
      position: relative;
    }

    .tech-step {
      background: var(--dark-card);
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: var(--radius-md);
      padding: 28px 22px;
      position: relative;
    }

    .step-num {
      font-size: 32px;
      font-weight: 900;
      color: rgba(255,255,255,0.12);
      line-height: 1;
      margin-bottom: 14px;
    }

    .tech-step h4 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
      color: #fff;
    }

    .tech-step p {
      font-size: 13px;
      color: var(--text-light);
      line-height: 1.6;
    }

    /* 6. 垂直赛事使用场景与用户故事 (#scenarios) */
    .scenarios-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .scenario-card {
      background: #fff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
    }

    .scenario-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
    }

    .scenario-body {
      padding: 24px;
    }

    .scenario-body h3 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
    }

    .scenario-body p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 7. 全球节点与性能关键数据统计条 (#metrics) */
    .metrics-bar {
      background: var(--primary);
      color: #fff;
      padding: 56px 0;
    }

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

    .metric-item .val {
      font-size: 44px;
      font-weight: 800;
      line-height: 1.1;
      margin-bottom: 8px;
      font-variant-numeric: tabular-nums;
    }

    .metric-item .label {
      font-size: 14px;
      color: rgba(255, 255, 255, 0.85);
      font-weight: 500;
    }

    /* 8. 客户成功案例与企业级评价墙 (#testimonials) */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .testimonial-card {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 32px 26px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }

    .quote-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 24px;
      flex-grow: 1;
      font-style: italic;
    }

    .user-info {
      display: flex;
      align-items: center;
      gap: 14px;
    }

    .user-avatar-tag {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 16px;
    }

    .user-meta h4 {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
    }

    .user-meta span {
      font-size: 12px;
      color: var(--text-light);
    }

    /* 9. 服务套餐与接入价格体系 (#pricing) */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      align-items: stretch;
    }

    .pricing-card {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 40px 32px;
      display: flex;
      flex-direction: column;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .pricing-card.featured {
      border: 2px solid var(--primary);
      box-shadow: 0 12px 30px rgba(0, 82, 217, 0.12);
      transform: scale(1.02);
    }

    .pricing-badge {
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--primary);
      color: #fff;
      font-size: 12px;
      font-weight: 700;
      padding: 4px 16px;
      border-radius: 999px;
    }

    .pricing-card h3 {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .pricing-card .price {
      font-size: 38px;
      font-weight: 800;
      color: var(--primary);
      margin: 16px 0;
    }

    .pricing-card .price span {
      font-size: 14px;
      color: var(--text-muted);
      font-weight: normal;
    }

    .pricing-features {
      list-style: none;
      margin: 24px 0 32px 0;
      flex-grow: 1;
    }

    .pricing-features li {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .pricing-features li::before {
      content: "•";
      color: var(--primary);
      font-size: 20px;
    }

    /* 10. 赛事转播与分发技术资讯摘要 (#news) */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .news-card {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }

    .news-body {
      padding: 26px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }

    .news-date {
      font-size: 12px;
      color: var(--text-light);
      margin-bottom: 10px;
    }

    .news-card h3 {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 12px;
      line-height: 1.45;
    }

    .news-card p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 11. 技术与合作常见问题 FAQ 展开区 (#faq) */
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      margin-bottom: 16px;
      overflow: hidden;
    }

    .faq-question {
      padding: 20px 24px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 700;
      font-size: 16px;
    }

    .faq-question::after {
      content: "+";
      font-size: 22px;
      color: var(--primary);
      transition: transform 0.25s ease;
    }

    .faq-item.active .faq-question::after {
      content: "−";
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #FAFCFF;
      color: var(--text-muted);
      font-size: 14px;
      line-height: 1.7;
      padding: 0 24px;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 24px 20px 24px;
    }

    /* 12. 商务咨询与开通接入 CTA 转化区 (#contact) */
    .contact-box {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 56px;
      box-shadow: var(--shadow-lg);
      max-width: 900px;
      margin: 0 auto;
    }

    .contact-form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-top: 32px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .form-group.full {
      grid-column: span 2;
    }

    .form-group label {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      font-size: 14px;
      outline: none;
      transition: border-color 0.2s;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(0, 82, 217, 0.15);
    }

    /* 页脚规范 (Footer) */
    .site-footer {
      background: #0A1226;
      color: #94A3B8;
      padding-top: 64px;
      border-top: 1px solid rgba(255,255,255,0.08);
      font-size: 14px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 48px;
      margin-bottom: 56px;
    }

    .footer-brand h3 {
      color: #fff;
      font-size: 20px;
      font-weight: 800;
      margin-bottom: 16px;
    }

    .footer-brand p {
      font-size: 13px;
      line-height: 1.7;
      color: #64748B;
      max-width: 320px;
    }

    .footer-col h4 {
      color: #fff;
      font-size: 15px;
      font-weight: 700;
      margin-bottom: 18px;
    }

    .footer-links {
      list-style: none;
    }

    .footer-links li {
      margin-bottom: 10px;
    }

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

    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.08);
      padding: 24px 0;
      font-size: 13px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .features-grid, .products-grid, .scenarios-grid, .testimonials-grid, .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .tech-pipeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .intro-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .section-py {
        padding: 56px 0;
      }
      .nav-menu {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 24px;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-lg);
      }
      .nav-menu.active {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
      .hero-title {
        font-size: 32px;
      }
      .features-grid, .products-grid, .scenarios-grid, .testimonials-grid, .news-grid, .pricing-grid {
        grid-template-columns: 1fr;
      }
      .tech-pipeline {
        grid-template-columns: 1fr;
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
      }
      .contact-box {
        padding: 32px 20px;
      }
      .contact-form-grid {
        grid-template-columns: 1fr;
      }
      .form-group.full {
        grid-column: span 1;
      }
      .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
      }
      .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
      }
    }