/* roulang page: index */
:root {
      --bg-dark-primary: #090d16;
      --bg-dark-secondary: #0f172a;
      --bg-dark-card: #141f36;
      --text-main: #f8fafc;
      --text-muted: #94a3b8;
      --brand-primary: #0ea5e9;
      --brand-border: rgba(14, 165, 233, 0.2);
    }
    body {
      background-color: var(--bg-dark-primary);
      color: var(--text-main);
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
      overflow-x: hidden;
    }
    .custom-gradient-nav {
      background: linear-gradient(90deg, rgba(15, 23, 42, 0.95) 0%, rgba(14, 165, 233, 0.2) 50%, rgba(15, 23, 42, 0.95) 100%);
      border-bottom: 1px solid rgba(14, 165, 233, 0.25);
    }
    .card-glass {
      background: rgba(20, 31, 54, 0.7);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255, 255, 255, 0.08);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-glass:hover {
      border-color: rgba(14, 165, 233, 0.4);
      transform: translateY(-4px);
      box-shadow: 0 12px 30px -10px rgba(14, 165, 233, 0.25);
    }
    .text-glow {
      text-shadow: 0 0 20px rgba(14, 165, 233, 0.4);
    }
    details summary::-webkit-details-marker {
      display: none;
    }