/* roulang page: index */
:root {
      --primary-gradient: linear-gradient(135deg, #1e3a8a 0%, #0284c7 100%);
      --accent-gradient: linear-gradient(135deg, #f59e0b 0%, #ea580c 100%);
      --card-bg: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
    }
    body {
      color: var(--text-main);
      background-color: #f8fafc;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    .gradient-brand {
      background: var(--primary-gradient);
    }
    .gradient-accent {
      background: var(--accent-gradient);
    }
    .card-hover-effect {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-hover-effect:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 40px -15px rgba(2, 132, 199, 0.15);
    }
    details summary::-webkit-details-marker {
      display:none;
    }