/* roulang page: index */
:root {
      --primary-deep: #0F172A;
      --accent-cyan: #06B6D4;
      --highlight-amber: #F59E0B;
      --surface-glass: rgba(30, 41, 59, 0.7);
      --text-main: #F8FAFC;
      --text-body: #94A3B8;
      --text-muted: #CBD5E1;
      --border-glow: rgba(6, 182, 212, 0.2);
      --shadow-card: 0 20px 40px rgba(6, 182, 212, 0.15);
      --radius-lg: 16px;
      --radius-xl: 24px;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--primary-deep);
      color: var(--text-body);
      line-height: 1.6;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }
    .glass-card {
      background: rgba(30, 41, 59, 0.6);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-lg);
      padding: 2rem;
      transition: all 300ms ease;
    }
    .glass-card:hover {
      border-color: var(--accent-cyan);
      transform: translateY(-4px);
      box-shadow: 0 20px 40px rgba(6, 182, 212, 0.2);
    }
    .cyan-gradient-text {
      background: linear-gradient(135deg, #06B6D4, #22D3EE);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .btn-primary {
      background-color: var(--accent-cyan);
      color: #0F172A;
      font-weight: 700;
      padding: 0.9rem 2rem;
      border-radius: 16px;
      transition: all 300ms;
      box-shadow: 0 0 20px rgba(6, 182, 212, 0.4);
      border: none;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-primary:hover {
      background-color: #22D3EE;
      box-shadow: 0 0 30px rgba(6, 182, 212, 0.7);
      transform: scale(1.02);
    }
    .btn-outline {
      border: 2px solid rgba(6, 182, 212, 0.5);
      color: #22D3EE;
      font-weight: 600;
      padding: 0.85rem 1.9rem;
      border-radius: 16px;
      background: transparent;
      transition: all 300ms;
      cursor: pointer;
    }
    .btn-outline:hover {
      background: rgba(6, 182, 212, 0.1);
      border-color: #06B6D4;
    }
    .nav-pill {
      padding: 0.6rem 1.5rem;
      border-radius: 9999px;
      background: rgba(255, 255, 255, 0.05);
      color: #CBD5E1;
      font-weight: 500;
      transition: all 250ms;
      white-space: nowrap;
      font-size: 0.95rem;
    }
    .nav-pill:hover {
      background: rgba(6, 182, 212, 0.3);
      color: white;
    }
    .nav-pill.active {
      background: #06B6D4;
      color: #0F172A;
      font-weight: 700;
      box-shadow: 0 4px 12px rgba(6,182,212,0.5);
    }
    .metric-number {
      font-weight: 900;
      color: var(--highlight-amber);
      font-size: 2.5rem;
      line-height: 1.2;
    }
    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease-in-out;
    }
    .faq-item.open .faq-content {
      max-height: 200px;
    }
    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }
    .comparison-badge {
      background: rgba(245, 158, 11, 0.15);
      color: #F59E0B;
      padding: 0.25rem 0.9rem;
      border-radius: 20px;
      font-weight: 600;
    }
    @media (max-width: 768px) {
      .hero-container {
        flex-direction: column;
      }
      .metric-panel {
        order: -1;
        margin-bottom: 2rem;
      }
      .nav-pills-row {
        justify-content: flex-start;
        flex-wrap: nowrap;
        overflow-x: auto;
        padding-bottom: 8px;
      }
      .nav-pills-row::-webkit-scrollbar {
        display: none;
      }
    }