/* roulang page: index */
:root {
      --primary: #0F766E;
      --primary-hover: #0D9488;
      --accent: #0284C7;
      --bg-light: #F8FAFC;
      --card-border: #E2E8F0;
      --dark-slate: #0F172A;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'PingFang SC', 'Noto Sans SC', sans-serif;
      background-color: var(--bg-light);
      color: #1E293B;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    .num-tabular {
      font-variant-numeric: tabular-nums;
    }
    .hero-mask {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.92) 0%, rgba(15, 118, 110, 0.82) 100%);
    }
    .card-hover {
      transition: all 0.24s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: 0 16px 30px -10px rgba(15, 118, 110, 0.12);
      border-color: rgba(15, 118, 110, 0.4);
    }
    details summary::-webkit-details-marker {
      display: none;
    }
    details[open] summary .faq-icon {
      transform: rotate(180deg);
    }