/* roulang page: index */
:root {
      --brand-dark: #0B0F17;
      --brand-navy: #1E293B;
      --brand-green: #10B981;
      --brand-emerald: #059669;
      --bg-light: #F8FAFC;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: #FFFFFF;
      overflow-x: hidden;
    }
    .anchor-section {
      scroll-margin-top: 104px;
    }
    .custom-card {
      transition: transform 0.25s ease-out, border-color 0.25s ease-out, box-shadow 0.25s ease-out;
      box-shadow: 0 1px 3px rgba(0,0,0,0.05), 0 20px 25px -5px rgba(0,0,0,0.02);
    }
    .custom-card:hover {
      transform: translateY(-4px);
      border-color: var(--brand-green);
    }
    details summary::-webkit-details-marker {
      display: none;
    }