/* roulang page: index */
:root {
      --primary: #2563eb;
      --primary-hover: #1d4ed8;
      --primary-light: #eff6ff;
      --text-main: #0f172a;
      --text-muted: #64748b;
      --border-color: #e2e8f0;
      --card-bg: #ffffff;
      --section-alt: #f8fafc;
    }
    html {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: #ffffff;
    }
    .card-lift {
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }
    .card-lift:hover {
      transform: translateY(-4px);
      box-shadow: 0 16px 30px -10px rgba(37, 99, 235, 0.12), 0 6px 12px -4px rgba(0, 0, 0, 0.04);
    }
    .hero-mesh {
      background: radial-gradient(circle at 10% 20%, rgba(219, 234, 254, 0.6) 0%, transparent 40%),
                  radial-gradient(circle at 90% 80%, rgba(239, 246, 255, 0.8) 0%, transparent 45%);
    }
    .text-serif-num {
      font-family: Georgia, Cambria, "Times New Roman", Times, serif;
    }