/* roulang page: index */
:root {
      --primary-color: #1d4ed8;
      --primary-hover: #0f52ba;
      --text-dark: #0f172a;
      --text-muted: #475569;
      --border-light: #e2e8f0;
      --bg-light: #f8fafc;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Segoe UI", "Microsoft YaHei", sans-serif;
      color: var(--text-dark);
      background-color: #ffffff;
      scroll-behavior: smooth;
      -webkit-font-smoothing: antialiased;
    }
    .shadow-subtle {
      box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05), 0 2px 6px -1px rgba(15, 23, 42, 0.03);
    }
    .shadow-hover {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .shadow-hover:hover {
      transform: translateY(-3px);
      box-shadow: 0 20px 25px -5px rgba(15, 82, 186, 0.1), 0 8px 10px -6px rgba(15, 82, 186, 0.06);
    }
    .hero-gradient {
      background: linear-gradient(135deg, rgba(248, 250, 252, 0.96) 0%, rgba(239, 246, 255, 0.94) 100%);
    }