/* roulang page: index */
:root {
      --primary: #10B981;
      --primary-hover: #059669;
      --primary-light: rgba(16, 185, 129, 0.1);
      --secondary: #111827;
      --titanium: #1F2937;
      --bg-light: #F9FAFB;
      --bg-alt: #F3F4F6;
      --bg-dark: #0B0F17;
      --text-main: #111827;
      --text-muted: #4B5563;
      --text-sub: #9CA3AF;
      --border-light: #E5E7EB;
      --border-dark: rgba(255, 255, 255, 0.08);
      --shadow-sm: 0 4px 20px -2px rgba(0, 0, 0, 0.05);
      --shadow-md: 0 10px 30px -4px rgba(0, 0, 0, 0.08);
      --radius: 8px;
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      padding: 0;
      background-color: var(--bg-light);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Noto Sans CSL", "Microsoft YaHei", sans-serif;
      line-height: 1.75;
      font-size: 15px;
      -webkit-font-smoothing: antialiased;
    }

    a { color: inherit; text-decoration: none; transition: all 0.25s ease; }
    a:hover { color: var(--primary); }
    img { max-width: 100%; height: auto; display: block; }

    /* 工具栏顶部导航 */
    .top-announcement {
      background: var(--bg-dark);
      color: var(--text-sub);
      font-size: 12px;
      letter-spacing: 0.05em;
      padding: 6px 0;
      border-bottom: 1px solid var(--border-dark);
    }
    .top-announcement .status-indicator {
      display: inline-block;
      width: 7px;
      height: 7px;
      background-color: var(--primary);
      border-radius: 50%;
      margin-right: 6px;
      box-shadow: 0 0 8px var(--primary);
    }

    .main-toolbar {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-light);
      height: 68px;
    }
    .toolbar-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 68px;
    }
    .nav-brand {
      display: flex;
      align-items: center;
      font-weight: 700;
      font-size: 20px;
      color: var(--secondary);
      letter-spacing: -0.02em;
    }
    .nav-brand-icon {
      width: 32px;
      height: 32px;
      background: var(--secondary);
      color: var(--primary);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-right: 10px;
      font-weight: 900;
      font-size: 17px;
    }
    .nav-menu {
      display: flex;
      gap: 22px;
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .nav-menu a {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-muted);
      padding: 6px 2px;
      position: relative;
    }
    .nav-menu a:hover {
      color: var(--text-main);
    }
    .nav-menu a:hover::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
    }
    .toolbar-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .btn-capsule {
      background: var(--primary);
      color: #fff;
      font-size: 13px;
      font-weight: 600;
      padding: 8px 20px;
      border-radius: 30px;
      border: 1px solid var(--primary);
      display: inline-flex;
      align-items: center;
      gap: 6px;
      box-shadow: 0 4px 14px rgba(16, 185, 129, 0.3);
      cursor: pointer;
    }
    .btn-capsule:hover {
      background: var(--primary-hover);
      color: #fff;
      box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
    }

    /* 板块通用间距与标题排版 */
    .app-section {
      padding: 90px 0;
      position: relative;
    }
    .app-section.bg-alt {
      background-color: var(--bg-alt);
      border-top: 1px solid var(--border-light);
      border-bottom: 1px solid var(--border-light);
    }
    .app-section.bg-dark {
      background-color: var(--bg-dark);
      color: #fff;
    }
    .section-header {
      margin-bottom: 50px;
    }
    .section-tag {
      font-size: 12px;
      font-weight: 700;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      color: var(--primary);
      margin-bottom: 8px;
      display: inline-block;
    }
    .section-title {
      font-size: 32px;
      font-weight: 800;
      letter-spacing: -0.02em;
      line-height: 1.3;
      margin-bottom: 16px;
      color: var(--secondary);
    }
    .bg-dark .section-title {
      color: #fff;
    }
    .section-desc {
      color: var(--text-muted);
      font-size: 15px;
      max-width: 680px;
      line-height: 1.7;
      margin: 0;
    }
    .bg-dark .section-desc {
      color: var(--text-sub);
    }

    /* 01. Hero 斜切首屏 (无大图 + 状态条 + 图标矩阵) */
    .section-hero {
      background: #ffffff;
      padding: 70px 0 90px 0;
      border-bottom: 1px solid var(--border-light);
    }
    .hero-badge-bar {
      display: inline-flex;
      align-items: center;
      background: var(--primary-light);
      border: 1px solid rgba(16, 185, 129, 0.25);
      border-radius: 40px;
      padding: 4px 14px;
      font-size: 13px;
      font-weight: 600;
      color: #065f46;
      margin-bottom: 24px;
    }
    .hero-h1 {
      font-size: 44px;
      font-weight: 900;
      line-height: 1.25;
      letter-spacing: -0.03em;
      color: var(--secondary);
      margin-bottom: 20px;
    }
    .hero-summary {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 34px;
      max-width: 780px;
    }
    .hero-matrix {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 24px;
    }
    .matrix-node {
      background: #ffffff;
      border: 1px solid var(--border-light);
      padding: 20px 18px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease, border-color 0.25s ease;
    }
    .matrix-node:hover {
      transform: translateY(-4px);
      border-color: var(--primary);
    }
    .matrix-icon {
      font-size: 20px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 8px;
    }
    .matrix-title {
      font-size: 15px;
      font-weight: 700;
      color: var(--secondary);
      margin-bottom: 6px;
    }
    .matrix-text {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
      margin: 0;
    }

    /* 02. section-countdown 倒计时同城运动赛事入口 */
    .countdown-banner {
      background: var(--secondary);
      border-radius: 12px;
      padding: 30px 40px;
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: var(--shadow-md);
    }
    .countdown-timer-group {
      display: flex;
      gap: 14px;
    }
    .timer-unit {
      background: var(--titanium);
      border: 1px solid var(--border-dark);
      padding: 10px 16px;
      border-radius: 6px;
      text-align: center;
      min-width: 68px;
    }
    .timer-num {
      font-size: 24px;
      font-weight: 800;
      color: var(--primary);
      display: block;
      font-variant-numeric: tabular-nums;
    }
    .timer-lbl {
      font-size: 11px;
      color: var(--text-sub);
      text-transform: uppercase;
    }

    /* 03. section-intro 架构与技术理念区 */
    .tech-spec-bar {
      background: #fff;
      border: 1px solid var(--border-light);
      border-radius: 8px;
      padding: 24px;
      margin-top: 24px;
      display: flex;
      justify-content: space-around;
      text-align: center;
    }
    .spec-item h4 {
      font-size: 26px;
      font-weight: 800;
      color: var(--secondary);
      margin: 0 0 4px 0;
    }
    .spec-item p {
      font-size: 13px;
      color: var(--text-muted);
      margin: 0;
    }

    /* 04. section-solutions 对比表格卡片 */
    .compare-card {
      background: #fff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      padding: 30px;
      height: 100%;
      box-shadow: var(--shadow-sm);
    }
    .compare-card.positive {
      border-top: 4px solid var(--primary);
    }
    .compare-card.negative {
      border-top: 4px solid #EF4444;
      background: #fdfdfd;
    }
    .compare-list {
      list-style: none;
      margin: 20px 0 0 0;
      padding: 0;
    }
    .compare-list li {
      padding: 10px 0;
      border-bottom: 1px solid var(--border-light);
      font-size: 14px;
      display: flex;
      align-items: flex-start;
      gap: 10px;
    }

    /* 05. section-advantages 6卡片优势矩阵 */
    .advantage-card {
      background: #fff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      padding: 26px;
      margin-bottom: 24px;
      position: relative;
      transition: all 0.25s ease;
      height: calc(100% - 24px);
    }
    .advantage-card:hover {
      border-color: var(--primary);
      transform: translateY(-4px);
      box-shadow: var(--shadow-sm);
    }
    .card-seq {
      font-size: 20px;
      font-weight: 800;
      color: #D1D5DB;
      position: absolute;
      top: 20px;
      right: 20px;
    }

    /* 06. section-steps 组队约战链路 */
    .step-node {
      position: relative;
      padding: 26px;
      background: #fff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      margin-bottom: 20px;
    }
    .step-index-badge {
      display: inline-block;
      width: 28px;
      height: 28px;
      line-height: 28px;
      text-align: center;
      background: var(--primary);
      color: #fff;
      border-radius: 50%;
      font-size: 13px;
      font-weight: 700;
      margin-bottom: 12px;
    }

    /* 07. section-features 核心交互模块 */
    .feature-box {
      background: #fff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      overflow: hidden;
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }
    .feature-box-body {
      padding: 24px;
    }

    /* 08. section-dark-case 深色沉浸理念区 */
    .dark-stat-grid {
      border-top: 1px solid var(--border-dark);
      padding-top: 30px;
      margin-top: 30px;
    }

    /* 09. section-personas 运动圈层分类卡片 */
    .persona-badge-group {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 14px;
    }
    .p-tag {
      background: var(--bg-alt);
      font-size: 12px;
      color: var(--text-muted);
      padding: 4px 10px;
      border-radius: 4px;
    }

    /* 10. section-stories 深度约战故事与城市案例 */
    .story-card {
      background: #fff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      padding: 26px;
      margin-bottom: 24px;
    }

    /* 11. section-stats 活跃度度量条 */
    .metric-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .metric-block {
      background: #fff;
      border: 1px solid var(--border-light);
      padding: 26px;
      border-radius: var(--radius);
      text-align: center;
    }
    .metric-val {
      font-size: 36px;
      font-weight: 900;
      color: var(--primary);
      line-height: 1.1;
      margin-bottom: 6px;
      font-variant-numeric: tabular-nums;
    }

    /* 12. section-testimonials 用户口碑 */
    .quote-card {
      background: #fff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      padding: 26px;
      font-size: 14px;
      color: var(--text-muted);
      height: 100%;
    }
    .quote-author {
      margin-top: 16px;
      font-weight: 700;
      color: var(--secondary);
    }

    /* 13. section-news-feed 动态资讯与底部 FAQ-CTA */
    .news-item {
      padding: 16px 0;
      border-bottom: 1px solid var(--border-light);
    }
    .news-date {
      font-size: 12px;
      color: var(--text-sub);
    }

    .accordion-title {
      font-weight: 700;
      font-size: 16px;
      color: var(--secondary);
      padding: 16px 20px;
      background: #fff;
      border: 1px solid var(--border-light);
      margin-bottom: 8px;
      border-radius: 6px;
      cursor: pointer;
    }
    .accordion-content {
      padding: 16px 20px;
      background: var(--bg-alt);
      font-size: 14px;
      color: var(--text-muted);
      border-radius: 0 0 6px 6px;
      margin-top: -8px;
      margin-bottom: 8px;
    }

    .cta-strip {
      background: linear-gradient(135deg, var(--secondary) 0%, #1a2234 100%);
      border-radius: 12px;
      padding: 44px;
      color: #fff;
      text-align: center;
      margin-top: 50px;
      border: 1px solid var(--border-dark);
    }

    /* 页脚 */
    .site-footer {
      background: var(--bg-dark);
      color: var(--text-sub);
      padding: 60px 0 30px 0;
      font-size: 13px;
      border-top: 1px solid var(--border-dark);
    }
    .footer-title {
      font-size: 15px;
      font-weight: 700;
      color: #fff;
      margin-bottom: 16px;
    }
    .footer-list {
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .footer-list li {
      margin-bottom: 8px;
    }
    .footer-bottom {
      border-top: 1px solid var(--border-dark);
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 12px;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-matrix { grid-template-columns: repeat(2, 1fr); }
      .metric-row { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 640px) {
      .hero-h1 { font-size: 30px; }
      .hero-matrix { grid-template-columns: 1fr; }
      .metric-row { grid-template-columns: 1fr; }
      .nav-menu { display: none; }
      .countdown-banner { flex-direction: column; text-align: center; gap: 20px; }
      .tech-spec-bar { flex-direction: column; gap: 16px; }
      .cta-strip { padding: 30px 20px; }
    }