/* roulang page: index */
:root {
      --primary-blue: #0b1528;
      --secondary-blue: #132238;
      --accent-cyan: #00f2fe;
      --accent-cyan-hover: #4facfe;
      --brand-gradient: linear-gradient(135deg, #00f2fe 0%, #4facfe 100%);
      --bg-dark: #070c16;
      --bg-card: #151e30;
      --bg-card-hover: #1c2840;
      --text-white: #ffffff;
      --text-muted: #94a3b8;
      --text-light: #cbd5e1;
      --border-color: rgba(255, 255, 255, 0.08);
      --border-highlight: rgba(0, 242, 254, 0.3);
      --card-radius: 20px;
      --btn-radius: 999px;
      --box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
      --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--bg-dark);
      color: var(--text-white);
      line-height: 1.6;
      overflow-x: hidden;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

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

    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      width: 100%;
      background: rgba(11, 21, 40, 0.92);
      backdrop-filter: blur(12px);
      z-index: 1000;
      border-bottom: 1px solid var(--border-color);
    }

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

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

    .brand-logo-badge {
      background: var(--brand-gradient);
      color: #051020;
      padding: 4px 8px;
      border-radius: 6px;
      font-size: 0.75rem;
      font-weight: 800;
    }

    .nav-list {
      display: flex;
      list-style: none;
      gap: 24px;
    }

    .nav-link {
      font-size: 0.95rem;
      color: var(--text-light);
      font-weight: 500;
      padding: 8px 12px;
      border-radius: 6px;
      transition: var(--transition);
    }

    .nav-link:hover, .nav-link.active {
      color: var(--accent-cyan);
      background: rgba(0, 242, 254, 0.05);
    }

    .header-cta-btn {
      background: var(--brand-gradient);
      color: #0b1528;
      font-weight: 600;
      font-size: 0.9rem;
      padding: 10px 22px;
      border-radius: var(--btn-radius);
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 44px;
      box-shadow: 0 4px 14px rgba(0, 242, 254, 0.25);
    }

    .header-cta-btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(0, 242, 254, 0.4);
    }

    /* 板块通用规范 */
    .section-padding {
      padding: 80px 0;
      border-bottom: 1px solid var(--border-color);
    }

    .section-alt {
      background: var(--secondary-blue);
    }

    .section-header {
      text-align: center;
      max-width: 820px;
      margin: 0 auto 50px auto;
    }

    .section-badge {
      display: inline-block;
      padding: 6px 14px;
      border-radius: 30px;
      background: rgba(0, 242, 254, 0.1);
      border: 1px solid var(--border-highlight);
      color: var(--accent-cyan);
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 14px;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 16px;
      color: var(--text-white);
    }

    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 按钮规范 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--btn-radius);
      transition: var(--transition);
      min-height: 46px;
      cursor: pointer;
    }

    .btn-primary {
      background: var(--brand-gradient);
      color: #070c16;
      box-shadow: 0 6px 18px rgba(0, 242, 254, 0.3);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 24px rgba(0, 242, 254, 0.45);
    }

    .btn-secondary {
      background: rgba(255, 255, 255, 0.08);
      color: var(--text-white);
      border: 1px solid var(--border-color);
      margin-left: 14px;
    }

    .btn-secondary:hover {
      background: rgba(255, 255, 255, 0.15);
      border-color: var(--text-light);
    }

    /* 1. Hero 蓝图 - 短视频竖屏感主视觉 + 跟买/了解 CTA */
    .hero-section {
      position: relative;
      padding: 90px 0 100px;
      background: radial-gradient(circle at 70% 30%, rgba(0, 242, 254, 0.08) 0%, transparent 60%),
                  radial-gradient(circle at 10% 80%, rgba(79, 172, 254, 0.06) 0%, transparent 50%),
                  var(--primary-blue);
      overflow: hidden;
      border-bottom: 1px solid var(--border-color);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 50px;
      align-items: center;
    }

    .hero-content h1 {
      font-size: 2.75rem;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }

    .hero-content h1 span {
      background: var(--brand-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-intro {
      font-size: 1.05rem;
      color: var(--text-light);
      line-height: 1.8;
      margin-bottom: 34px;
    }

    .hero-stats-row {
      display: flex;
      gap: 30px;
      margin-top: 40px;
      padding-top: 30px;
      border-top: 1px solid var(--border-color);
    }

    .hero-stat-item h3 {
      font-size: 1.6rem;
      color: var(--accent-cyan);
      font-weight: 700;
    }

    .hero-stat-item p {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 竖屏视频感视觉卡片 */
    .hero-vertical-mock {
      background: var(--bg-card);
      border: 1px solid var(--border-highlight);
      border-radius: 28px;
      padding: 16px;
      box-shadow: 0 20px 45px rgba(0, 0, 0, 0.6);
      position: relative;
      max-width: 380px;
      margin: 0 auto;
    }

    .mock-screen {
      position: relative;
      border-radius: 20px;
      overflow: hidden;
      aspect-ratio: 9/16;
      background: #000;
    }

    .mock-screen img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .mock-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(0,0,0,0.2) 0%, rgba(0,0,0,0.85) 100%);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      padding: 18px;
    }

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

    .mock-live-tag {
      background: #ef4444;
      color: #fff;
      font-size: 0.7rem;
      padding: 3px 8px;
      border-radius: 4px;
      font-weight: 700;
      display: flex;
      align-items: center;
      gap: 4px;
    }

    .mock-data-bubble {
      background: rgba(11, 21, 40, 0.8);
      backdrop-filter: blur(8px);
      padding: 12px;
      border-radius: 14px;
      border: 1px solid rgba(0, 242, 254, 0.3);
      font-size: 0.8rem;
    }

    .mock-data-bubble span {
      color: var(--accent-cyan);
      font-weight: 700;
    }

    /* 2. 品类入口 (架构与终端兼容) */
    .category-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .cat-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--card-radius);
      padding: 24px;
      text-align: center;
      transition: var(--transition);
    }

    .cat-card:hover {
      border-color: var(--border-highlight);
      transform: translateY(-5px);
      background: var(--bg-card-hover);
    }

    .cat-icon {
      width: 48px;
      height: 48px;
      margin: 0 auto 16px;
      background: rgba(0, 242, 254, 0.1);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      color: var(--accent-cyan);
    }

    .cat-card h3 {
      font-size: 1.15rem;
      margin-bottom: 8px;
    }

    .cat-card p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 3. 核心优势区 (3x2 网格 + 数据徽章) */
    .grid-3x2 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .advantage-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--card-radius);
      padding: 28px;
      position: relative;
      transition: var(--transition);
    }

    .advantage-card:hover {
      border-color: var(--border-highlight);
      box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
    }

    .data-badge {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--accent-cyan);
      background: rgba(0, 242, 254, 0.1);
      padding: 4px 10px;
      border-radius: 6px;
      margin-bottom: 14px;
      border: 1px solid rgba(0, 242, 254, 0.2);
    }

    .advantage-card h3 {
      font-size: 1.25rem;
      margin-bottom: 10px;
    }

    .advantage-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 4. 附近推荐/热门产品解决方案 (1x3 横向大卡) */
    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .solution-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--card-radius);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }

    .solution-card:hover {
      transform: translateY(-5px);
      border-color: var(--accent-cyan);
    }

    .solution-media {
      height: 180px;
      position: relative;
      overflow: hidden;
    }

    .solution-media img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }

    .solution-card:hover .solution-media img {
      transform: scale(1.05);
    }

    .solution-body {
      padding: 24px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }

    .solution-body h3 {
      font-size: 1.25rem;
      margin-bottom: 10px;
    }

    .solution-body p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 20px;
      flex-grow: 1;
    }

    .solution-features {
      list-style: none;
      border-top: 1px solid var(--border-color);
      padding-top: 14px;
      margin-bottom: 16px;
    }

    .solution-features li {
      font-size: 0.85rem;
      color: var(--text-light);
      margin-bottom: 6px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .solution-features li::before {
      content: "•";
      color: var(--accent-cyan);
      font-weight: bold;
    }

    /* 5. 技术架构与核心理念 (深色底+指标) */
    .tech-stack-container {
      background: #040810;
      border-radius: var(--card-radius);
      border: 1px solid var(--border-color);
      padding: 40px;
    }

    .tech-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 30px;
    }

    .tech-item {
      background: rgba(255, 255, 255, 0.02);
      border: 1px solid rgba(255, 255, 255, 0.05);
      border-radius: 14px;
      padding: 20px;
      text-align: center;
    }

    .tech-item h4 {
      font-size: 1.1rem;
      margin-bottom: 8px;
      color: var(--accent-cyan);
    }

    .tech-item p {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 6. 关键数据统计条 */
    .metric-strip {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      text-align: center;
    }

    .metric-box {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--card-radius);
      padding: 30px 20px;
    }

    .metric-val {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--accent-cyan);
      line-height: 1;
      margin-bottom: 10px;
      font-family: inherit;
    }

    .metric-title {
      font-size: 0.95rem;
      color: var(--text-light);
      margin-bottom: 6px;
    }

    .metric-detail {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* 7. 口碑榜 / 用户故事 */
    .stories-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }

    .story-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--card-radius);
      padding: 30px;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

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

    .story-avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--brand-gradient);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      color: #040810;
    }

    .story-text {
      font-size: 0.92rem;
      color: var(--text-light);
      line-height: 1.7;
    }

    .story-meta {
      font-size: 0.85rem;
      color: var(--accent-cyan);
    }

    /* 8. 保障承诺条 */
    .guarantee-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .guarantee-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
      background: var(--bg-card);
      padding: 20px;
      border-radius: var(--card-radius);
      border: 1px solid var(--border-color);
    }

    .guarantee-icon {
      font-size: 1.5rem;
      color: var(--accent-cyan);
    }

    .guarantee-item h4 {
      font-size: 1rem;
      margin-bottom: 4px;
    }

    .guarantee-item p {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    /* 9. 到店/合作流程 (步骤四连) */
    .process-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .process-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--card-radius);
      padding: 28px 20px;
      position: relative;
    }

    .process-step {
      font-size: 2rem;
      font-weight: 800;
      color: rgba(0, 242, 254, 0.2);
      line-height: 1;
      margin-bottom: 12px;
    }

    .process-card h3 {
      font-size: 1.15rem;
      margin-bottom: 10px;
    }

    .process-card p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 10. 资讯列表区 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .news-card {
      background: var(--bg-card);
      border-radius: var(--card-radius);
      border: 1px solid var(--border-color);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }

    .news-card-body {
      padding: 24px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }

    .news-date {
      font-size: 0.8rem;
      color: var(--text-muted);
      margin-bottom: 10px;
    }

    .news-card h3 {
      font-size: 1.1rem;
      margin-bottom: 12px;
      line-height: 1.4;
    }

    .news-card p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      flex-grow: 1;
    }

    .news-link-btn {
      color: var(--accent-cyan);
      font-size: 0.85rem;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 11. FAQ 手风琴 */
    .faq-wrapper {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 14px;
      overflow: hidden;
    }

    .faq-question {
      padding: 20px 24px;
      font-size: 1.05rem;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

    .faq-question::after {
      content: "+";
      font-size: 1.4rem;
      color: var(--accent-cyan);
      transition: var(--transition);
    }

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

    .faq-answer {
      padding: 0 24px 20px;
      font-size: 0.92rem;
      color: var(--text-light);
      line-height: 1.7;
      display: none;
    }

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

    /* 12. 预约入口 / 转化收口 */
    .cta-container {
      background: linear-gradient(135deg, rgba(11, 21, 40, 0.9) 0%, rgba(19, 34, 56, 0.95) 100%),
                  url('/assets/images/itc-AI智慧体育解决方案_让更多学生_AI_上运动_.jpg') center/cover no-repeat;
      border-radius: 28px;
      border: 1px solid var(--border-highlight);
      padding: 60px 40px;
      text-align: center;
      box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    }

    .cta-container h2 {
      font-size: 2.2rem;
      margin-bottom: 16px;
    }

    .cta-container p {
      max-width: 680px;
      margin: 0 auto 30px;
      color: var(--text-light);
      font-size: 1.05rem;
    }

    /* 页脚与信任保障 */
    .site-footer {
      background: #040810;
      padding: 60px 0 30px;
      border-top: 1px solid var(--border-color);
      font-size: 0.88rem;
      color: var(--text-muted);
    }

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

    .footer-brand h4 {
      font-size: 1.2rem;
      color: var(--text-white);
      margin-bottom: 14px;
    }

    .footer-brand p {
      line-height: 1.7;
      max-width: 440px;
    }

    .footer-contact h5, .footer-links h5 {
      color: var(--text-white);
      font-size: 1rem;
      margin-bottom: 16px;
    }

    .footer-contact p {
      margin-bottom: 8px;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      padding-top: 24px;
      text-align: center;
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 12px;
    }

    /* 响应式断点适配 */
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .hero-vertical-mock {
        max-width: 320px;
      }
      .category-grid, .grid-3x2, .solutions-grid, .metric-strip, .guarantee-bar, .process-grid, .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .tech-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .hero-content h1 {
        font-size: 2.1rem;
      }
      .section-title {
        font-size: 1.6rem;
      }
      .section-padding {
        padding: 50px 0;
      }
      .hero-stats-row {
        flex-direction: column;
        gap: 16px;
      }
      .grid-3x2, .solutions-grid, .stories-grid, .metric-strip, .guarantee-bar, .process-grid, .news-grid, .category-grid, .tech-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .cta-container {
        padding: 40px 20px;
      }
      .btn {
        width: 100%;
        margin-left: 0;
        margin-top: 10px;
      }
      .hero-actions {
        display: flex;
        flex-direction: column;
      }
      .footer-bottom {
        flex-direction: column;
        text-align: center;
      }
    }