/* roulang page: index */
:root {
      --primary: #0066FF;
      --navy: #0F2C59;
      --accent: #5B4DFB;
      --text-main: #0F172A;
      --text-sub: #475569;
      --bg-surface: #F8FAFC;
      --border-color: #E2E8F0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      color: var(--text-main);
      background-color: #FFFFFF;
      font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
      -webkit-font-smoothing: antialiased;
    }
    .custom-shadow {
      box-shadow: 0 10px 30px -10px rgba(15, 44, 89, 0.08);
    }
    .custom-shadow-hover:hover {
      box-shadow: 0 20px 35px -10px rgba(0, 102, 255, 0.12);
      transform: translateY(-4px);
    }
    details > summary {
      list-style: none;
    }
    details > summary::-webkit-details-marker {
      display: none;
    }