/* roulang page: index */
:root {
      --bg-main: #0B1120;
      --bg-sub: #0F172A;
      --bg-card: rgba(30, 41, 59, 0.75);
      --border-glass: rgba(255, 255, 255, 0.12);
      --glow-cyan: rgba(56, 189, 248, 0.4);
      --glow-emerald: rgba(16, 185, 129, 0.35);
    }
    body {
      background-color: var(--bg-main);
      color: #F1F5F9;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
      overflow-x: hidden;
    }
    .glass-panel {
      background: var(--bg-card);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--border-glass);
    }
    .glass-panel-hover {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .glass-panel-hover:hover {
      border-color: rgba(56, 189, 248, 0.4);
      transform: translateY(-4px);
      box-shadow: 0 16px 32px -8px rgba(0, 0, 0, 0.5), 0 0 24px var(--glow-cyan);
    }
    .btn-glow {
      box-shadow: 0 0 20px var(--glow-cyan);
      transition: all 0.25s ease;
    }
    .btn-glow:hover {
      box-shadow: 0 0 30px rgba(56, 189, 248, 0.65);
      transform: translateY(-2px);
    }
    .text-gradient {
      background: linear-gradient(135deg, #38BDF8 0%, #818CF8 50%, #C084FC 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .text-gradient-emerald {
      background: linear-gradient(135deg, #34D399 0%, #38BDF8 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .code-glow {
      text-shadow: 0 0 12px rgba(56, 189, 248, 0.4);
    }
    details summary::-webkit-details-marker {
      display: none;
    }