/* roulang page: index */
:root {
      --primary: #1E40AF;
      --secondary: #0284C7;
      --accent: #2563EB;
      --teal: #0D9488;
      --dark: #0F172A;
      --surface: #F8FAFC;
    }
    * {
      box-sizing: border-box;
      scroll-behavior: smooth;
    }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      color: #334155;
      background-color: #F8FAFC;
      line-height: 1.65;
    }
    .custom-shadow {
      box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.06);
    }
    .card-hover {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 25px -5px rgba(30, 64, 175, 0.1), 0 8px 10px -6px rgba(30, 64, 175, 0.1);
    }
    details summary::-webkit-details-marker {
      display: none;
    }