/* roulang page: index */
:root {
      --primary: #1e40af;
      --primary-hover: #1d4ed8;
      --accent: #0284c7;
      --cta: #ea580c;
      --cta-hover: #c2410c;
      --bg-base: #f8fafc;
      --bg-card: #ffffff;
      --bg-dark: #0f172a;
      --bg-dark-card: #1e293b;
      --text-title: #0f172a;
      --text-body: #334155;
      --text-muted: #64748b;
      --border-color: #e2e8f0;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 18px;
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
      --shadow-base: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
      --shadow-hover: 0 16px 32px -4px rgba(30, 64, 175, 0.12);
      --transition: all 0.28s ease;
      --container-w: 1200px;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-base);
      color: var(--text-body);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

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

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

    /* 顶部双行导航 */
    .top-bar {
      background-color: #f1f5f9;
      border-bottom: 1px solid var(--border-color);
      font-size: 13px;
      color: var(--text-muted);
      padding: 8px 0;
    }
    .top-bar-flex {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .top-bar-contact span {
      margin-right: 20px;
    }

    .main-header {
      background-color: #ffffff;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
      position: sticky;
      top: 0;
      z-index: 1000;
    }
    .nav-flex {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 76px;
    }
    .site-brand {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 22px;
      font-weight: 700;
      color: var(--text-title);
    }
    .brand-logo-icon {
      width: 40px;
      height: 40px;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-body);
      position: relative;
      padding: 6px 0;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a.active::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      height: 2px;
      background-color: var(--primary);
      border-radius: 2px;
    }

    /* 按钮通用 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 26px;
      font-size: 15px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      border: 1px solid transparent;
      cursor: pointer;
      transition: var(--transition);
      gap: 8px;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #fff;
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      box-shadow: 0 4px 14px rgba(30, 64, 175, 0.35);
    }
    .btn-cta {
      background-color: var(--cta);
      color: #fff;
    }
    .btn-cta:hover {
      background-color: var(--cta-hover);
      box-shadow: 0 4px 14px rgba(234, 88, 12, 0.35);
    }
    .btn-outline {
      border-color: #cbd5e1;
      color: var(--text-title);
      background-color: #fff;
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background-color: #f8fafc;
    }

    /* 板块结构基准 */
    .section-block {
      padding: 88px 0;
      border-bottom: 1px solid #f1f5f9;
    }
    .section-block.bg-light {
      background-color: #ffffff;
    }
    .section-header {
      max-width: 820px;
      margin: 0 auto 56px;
      text-align: center;
    }
    .section-tag {
      display: inline-block;
      font-size: 13px;
      font-weight: 700;
      color: var(--primary);
      background-color: #eff6ff;
      border: 1px solid #dbeafe;
      padding: 4px 14px;
      border-radius: 20px;
      margin-bottom: 16px;
      letter-spacing: 0.5px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-title);
      line-height: 1.35;
      margin-bottom: 18px;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 1. 首屏: 工业参数首屏 */
    .hero-section {
      position: relative;
      background: linear-gradient(135deg, #0b1329 0%, #1e293b 100%), url('/assets/images/一篇文章带你了解_数据分析在体育行业的应用---知乎-2.jpg') center/cover no-repeat;
      background-blend-mode: overlay;
      color: #ffffff;
      padding: 100px 0 80px;
    }
    .hero-content {
      max-width: 840px;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background-color: rgba(2, 132, 199, 0.25);
      border: 1px solid rgba(2, 132, 199, 0.4);
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 13px;
      color: #38bdf8;
      margin-bottom: 24px;
    }
    .hero-title {
      font-size: 44px;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 22px;
      letter-spacing: -0.5px;
    }
    .hero-lead {
      font-size: 17px;
      line-height: 1.8;
      color: #cbd5e1;
      margin-bottom: 36px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      margin-bottom: 56px;
    }
    .hero-param-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.12);
      backdrop-filter: blur(12px);
      padding: 24px 30px;
      border-radius: var(--radius-md);
    }
    .param-item h4 {
      font-size: 28px;
      font-weight: 700;
      color: #38bdf8;
      margin-bottom: 4px;
      font-family: inherit;
    }
    .param-item p {
      font-size: 13px;
      color: #94a3b8;
    }

    /* 2. 服务亮点 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .service-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: var(--card-pad);
      box-shadow: var(--shadow-base);
      transition: var(--transition);
      position: relative;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: #bfdbfe;
    }
    .service-icon-box {
      width: 52px;
      height: 52px;
      background-color: #eff6ff;
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 22px;
      color: var(--primary);
    }
    .service-card h3 {
      font-size: 20px;
      font-weight: 700;
      color: var(--text-title);
      margin-bottom: 12px;
    }
    .service-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 3. 时段卡 */
    .timeline-schedule-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .period-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px;
      position: relative;
      box-shadow: var(--shadow-base);
    }
    .period-card.featured {
      border: 2px solid var(--primary);
    }
    .period-badge {
      position: absolute;
      top: 16px;
      right: 16px;
      background-color: var(--primary);
      color: #fff;
      font-size: 12px;
      padding: 2px 10px;
      border-radius: 12px;
    }
    .period-phase {
      font-size: 14px;
      font-weight: 700;
      color: var(--accent);
      margin-bottom: 8px;
    }
    .period-title {
      font-size: 20px;
      font-weight: 700;
      color: var(--text-title);
      margin-bottom: 14px;
    }
    .period-desc {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 20px;
      line-height: 1.6;
    }
    .period-tasks {
      list-style: none;
      border-top: 1px dashed var(--border-color);
      padding-top: 16px;
    }
    .period-tasks li {
      font-size: 13px;
      color: var(--text-body);
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .period-tasks li::before {
      content: "•";
      color: var(--primary);
      font-size: 18px;
    }

    /* 4. 技术架构与参数速览 */
    .arch-dual-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .arch-image-wrap {
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-hover);
      border: 1px solid var(--border-color);
    }
    .arch-content h3 {
      font-size: 26px;
      font-weight: 700;
      color: var(--text-title);
      margin-bottom: 16px;
    }
    .arch-content p {
      font-size: 15px;
      color: var(--text-muted);
      margin-bottom: 28px;
    }
    .specs-table {
      width: 100%;
      border-collapse: collapse;
      margin-top: 10px;
    }
    .specs-table tr {
      border-bottom: 1px solid #edf2f7;
    }
    .specs-table th {
      padding: 12px 0;
      font-size: 14px;
      color: var(--text-title);
      font-weight: 600;
      width: 35%;
      text-align: left;
    }
    .specs-table td {
      padding: 12px 0;
      font-size: 14px;
      color: var(--text-body);
    }

    /* 5. 专家/团队 */
    .team-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .team-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
      box-shadow: var(--shadow-base);
    }
    .team-avatar-placeholder {
      width: 80px;
      height: 80px;
      border-radius: 50%;
      background: linear-gradient(135deg, #dbeafe, #bfdbfe);
      margin: 0 auto 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
    }
    .team-name {
      font-size: 17px;
      font-weight: 700;
      color: var(--text-title);
      margin-bottom: 4px;
    }
    .team-role {
      font-size: 13px;
      color: var(--accent);
      font-weight: 600;
      margin-bottom: 12px;
    }
    .team-intro {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 6. 深色方法论对比 */
    .dark-section {
      background-color: var(--bg-dark);
      color: #ffffff;
      padding: 88px 0;
    }
    .dark-section .section-title {
      color: #ffffff;
    }
    .dark-section .section-desc {
      color: #94a3b8;
    }
    .method-process {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
      position: relative;
    }
    .method-card {
      background: var(--bg-dark-card);
      border: 1px solid #334155;
      border-radius: var(--radius-md);
      padding: 32px;
      position: relative;
    }
    .step-number {
      font-size: 36px;
      font-weight: 800;
      color: var(--accent);
      opacity: 0.8;
      margin-bottom: 12px;
    }
    .method-card h3 {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 12px;
      color: #f1f5f9;
    }
    .method-card p {
      font-size: 14px;
      color: #94a3b8;
      line-height: 1.7;
    }

    /* 7. 案例摘要 */
    .case-story-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow: hidden;
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      box-shadow: var(--shadow-base);
      margin-bottom: 36px;
    }
    .case-content {
      padding: 44px;
    }
    .case-badge {
      display: inline-block;
      font-size: 12px;
      font-weight: 700;
      color: var(--accent);
      background-color: #f0f9ff;
      padding: 3px 10px;
      border-radius: 4px;
      margin-bottom: 14px;
    }
    .case-content h3 {
      font-size: 24px;
      font-weight: 700;
      color: var(--text-title);
      margin-bottom: 14px;
    }
    .case-desc {
      font-size: 15px;
      color: var(--text-muted);
      margin-bottom: 24px;
      line-height: 1.7;
    }
    .case-metrics-bar {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      border-top: 1px solid var(--border-color);
      padding-top: 20px;
    }
    .c-metric strong {
      display: block;
      font-size: 22px;
      color: var(--primary);
    }
    .c-metric span {
      font-size: 12px;
      color: var(--text-muted);
    }
    .case-img-cover {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    /* 8. 评价保障 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px;
      box-shadow: var(--shadow-base);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .t-quote {
      font-size: 14px;
      color: var(--text-body);
      line-height: 1.7;
      margin-bottom: 24px;
      position: relative;
    }
    .t-author {
      display: flex;
      align-items: center;
      gap: 14px;
      border-top: 1px solid #f1f5f9;
      padding-top: 16px;
    }
    .t-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #eff6ff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
    }
    .t-info h4 {
      font-size: 15px;
      color: var(--text-title);
    }
    .t-info p {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 9. 安全审计与合规体系 */
    .audit-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .audit-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 24px;
      text-align: left;
    }
    .audit-box svg {
      width: 32px;
      height: 32px;
      fill: var(--primary);
      margin-bottom: 14px;
    }
    .audit-box h4 {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-title);
      margin-bottom: 8px;
    }
    .audit-box p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 10. 资讯列表与营销洞察 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .news-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-base);
    }
    .news-card-img {
      height: 180px;
      overflow: hidden;
    }
    .news-card-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }
    .news-card:hover .news-card-img img {
      transform: scale(1.04);
    }
    .news-body {
      padding: 24px;
    }
    .news-meta {
      font-size: 12px;
      color: var(--text-muted);
      margin-bottom: 8px;
    }
    .news-title {
      font-size: 17px;
      font-weight: 700;
      color: var(--text-title);
      margin-bottom: 12px;
      line-height: 1.45;
    }
    .news-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 11. 常见问题解答手风琴 */
    .faq-container {
      max-width: 840px;
      margin: 0 auto;
    }
    details.faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      margin-bottom: 14px;
      overflow: hidden;
      transition: var(--transition);
    }
    details.faq-item[open] {
      border-color: #93c5fd;
      box-shadow: var(--shadow-sm);
    }
    summary.faq-question {
      padding: 18px 24px;
      font-size: 16px;
      font-weight: 600;
      color: var(--text-title);
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    summary.faq-question::-webkit-details-marker {
      display: none;
    }
    summary.faq-question::after {
      content: "+";
      font-size: 20px;
      color: var(--primary);
    }
    details[open] summary.faq-question::after {
      content: "−";
    }
    .faq-answer {
      padding: 0 24px 20px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 12. 预约表单 / 收口行动区 */
    .cta-card-wrapper {
      background: linear-gradient(135deg, #1e40af 0%, #0369a1 100%);
      border-radius: var(--radius-lg);
      padding: 64px 48px;
      color: #ffffff;
      text-align: center;
      box-shadow: var(--shadow-hover);
    }
    .cta-title {
      font-size: 34px;
      font-weight: 800;
      margin-bottom: 16px;
    }
    .cta-subtitle {
      font-size: 16px;
      color: #e0f2fe;
      max-width: 680px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }
    .form-inline {
      display: flex;
      justify-content: center;
      gap: 12px;
      max-width: 600px;
      margin: 0 auto 20px;
    }
    .form-inline input {
      flex: 1;
      height: 48px;
      padding: 0 16px;
      border-radius: var(--radius-sm);
      border: 1px solid rgba(255, 255, 255, 0.3);
      background: #ffffff;
      font-size: 14px;
      outline: none;
    }
    .cta-hint {
      font-size: 13px;
      color: #bae6fd;
    }

    /* 页脚 */
    .global-footer {
      background-color: var(--bg-dark);
      color: #94a3b8;
      padding: 72px 0 28px;
      font-size: 14px;
      border-top: 1px solid #1e293b;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 48px;
      margin-bottom: 56px;
    }
    .footer-brand h4 {
      font-size: 20px;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 16px;
    }
    .footer-brand p {
      line-height: 1.7;
      margin-bottom: 20px;
    }
    .footer-col h5 {
      font-size: 15px;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 18px;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a:hover {
      color: #ffffff;
    }
    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 28px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
    }
    .footer-bottom a {
      color: #94a3b8;
    }
    .footer-bottom a:hover {
      color: #ffffff;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .services-grid,
      .timeline-schedule-grid,
      .news-grid,
      .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .team-grid,
      .audit-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 36px;
      }
      .hero-param-bar {
        grid-template-columns: repeat(2, 1fr);
      }
      .arch-dual-wrapper,
      .case-story-card {
        grid-template-columns: 1fr;
      }
      .case-img-cover {
        height: 260px;
      }
    }

    @media (max-width: 768px) {
      .top-bar {
        display: none;
      }
      .nav-links {
        display: none;
      }
      .hero-title {
        font-size: 30px;
      }
      .hero-param-bar {
        grid-template-columns: 1fr;
      }
      .services-grid,
      .timeline-schedule-grid,
      .method-process,
      .team-grid,
      .testimonials-grid,
      .audit-grid,
      .news-grid {
        grid-template-columns: 1fr;
      }
      .form-inline {
        flex-direction: column;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
      }
      .section-block {
        padding: 56px 0;
      }
      .hero-actions {
        flex-direction: column;
      }
      .case-metrics-bar {
        grid-template-columns: 1fr;
      }
    }