/* roulang page: index */
:root {
      --primary: #1A365D;
      --secondary: #2B6CB0;
      --accent: #D69E2E;
      --bg-light: #F7FAFC;
      --text-main: #1A202C;
      --text-muted: #4A5568;
      --text-sub: #718096;
      --border-color: #E2E8F0;
      --radius-card: 1rem;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: #FFFFFF;
      line-height: 1.65;
    }
    .custom-shadow {
      box-shadow: 0 10px 25px -5px rgba(26, 54, 93, 0.06), 0 8px 10px -6px rgba(26, 54, 93, 0.04);
    }
    .card-hover {
      transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 30px -10px rgba(43, 108, 176, 0.12), 0 10px 10px -5px rgba(0, 0, 0, 0.03);
    }