/* roulang page: index */
:root {
      --brand-titan: #1E3A4C;
      --brand-emerald: #0D9488;
      --brand-amber: #F59E0B;
      --bg-warm: #F8F9FA;
      --text-dark: #0F172A;
      --text-slate: #334155;
      --text-muted: #64748B;
      --border-line: #E2E8F0;
    }
    *, *::before, *::after {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      padding: 0;
      background-color: var(--bg-warm);
      color: var(--text-slate);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.2s ease-in-out;
    }
    button, input, select {
      font-family: inherit;
    }
    .custom-scroll::-webkit-scrollbar {
      height: 6px;
    }
    .custom-scroll::-webkit-scrollbar-thumb {
      background: #CBD5E1;
      border-radius: 9999px;
    }
    details summary::-webkit-details-marker {
      display: none;
    }
    details[open] summary svg {
      transform: rotate(180deg);
    }
    .hero-mask {
      background: linear-gradient(180deg, rgba(15, 23, 42, 0.72) 0%, rgba(30, 58, 76, 0.85) 100%);
    }