/* roulang page: index */
:root {
      --primary: #1E56A0;
      --secondary: #163172;
      --accent: #00A8CC;
      --bg-base: #F8FAFC;
      --border-color: #E2E8F0;
      --card-shadow: 0 4px 20px -2px rgba(30, 86, 160, 0.08);
      --card-hover-shadow: 0 12px 28px -4px rgba(30, 86, 160, 0.16);
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-base);
      color: #334155;
      line-height: 1.7;
    }
    .custom-card-shadow {
      box-shadow: var(--card-shadow);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }
    .custom-card-shadow:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
    }
    .hero-mask {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.94) 0%, rgba(22, 49, 114, 0.88) 100%);
    }
    details summary::-webkit-details-marker {
      display: none;
    }