/* roulang page: index */
:root {
      --primary: #FF5500;
      --primary-hover: #E04B00;
      --accent: #00E575;
      --bg-light: #F8FAFC;
      --bg-dark: #0F1318;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
      line-height: 1.75;
      color: var(--text-main);
      background-color: var(--bg-light);
      overflow-x: hidden;
    }
    .sport-title-tight {
      letter-spacing: -0.02em;
    }
    .hero-bg-overlay {
      background: linear-gradient(135deg, rgba(15, 19, 24, 0.92) 0%, rgba(24, 30, 37, 0.85) 60%, rgba(255, 85, 0, 0.7) 100%);
    }
    .glass-effect {
      background: rgba(255, 255, 255, 0.88);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }
    .glass-dark {
      background: rgba(24, 30, 37, 0.75);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
    }
    .tab-pill.active {
      background-color: #FF5500;
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(255, 85, 0, 0.3);
    }
    .timeline-dot::after {
      content: '';
      position: absolute;
      width: 2px;
      height: calc(100% - 24px);
      background: #E2E8F0;
      top: 28px;
      left: 11px;
    }
    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out, opacity 0.3s ease;
      opacity: 0;
    }
    .faq-item.open .faq-content {
      max-height: 280px;
      opacity: 1;
    }
    .faq-item.open .faq-icon {
      transform: rotate(180deg);
      color: #FF5500;
    }