/* roulang page: index */
:root {
      --primary: #1E40AF;
      --primary-hover: #1D4ED8;
      --accent: #0284C7;
      --dark-surface: #0F172A;
      --dark-card: #1E293B;
      --bg-page: #F8FAFC;
      --text-main: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
    }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-body);
      line-height: 1.7;
    }
    .custom-shadow {
      box-shadow: 0 4px 6px -1px rgba(15, 23, 42, 0.05), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .custom-shadow:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 25px -5px rgba(30, 64, 175, 0.08), 0 8px 10px -6px rgba(30, 64, 175, 0.04);
    }
    details summary::-webkit-details-marker {
      display: none;
    }
    details[open] summary svg {
      transform: rotate(180deg);
    }
    html {
      scroll-behavior: smooth;
    }