/* roulang page: index */
:root {
      --primary: #1E40AF;
      --accent: #0284C7;
      --dark: #0F172A;
      --bg-light: #F8FAFC;
      --text-main: #1E293B;
      --text-muted: #475569;
      --border-color: #E2E8F0;
      --card-shadow: 0 4px 20px -2px rgba(30, 64, 175, 0.05);
      --card-shadow-hover: 0 12px 28px -4px rgba(30, 64, 175, 0.12);
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      color: var(--text-main);
      background-color: var(--bg-light);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      overflow-x: hidden;
    }
    .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-shadow-hover);
    }
    .hero-bg-overlay {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.88) 0%, rgba(30, 64, 175, 0.82) 100%);
    }
    details summary::-webkit-details-marker {
      display: none;
    }