/* roulang page: index */
:root {
      --bg-main: #0a0f1d;
      --bg-alt: #0d1527;
      --brand-cyan: #00f0ff;
      --brand-blue: #0ea5e9;
      --brand-indigo: #6366f1;
      --brand-mint: #10b981;
      --text-head: #f8fafc;
      --text-body: #94a3b8;
      --text-muted: #64748b;
      --border-glass: rgba(255, 255, 255, 0.08);
      --card-glass: rgba(15, 23, 42, 0.65);
    }
    body {
      background-color: var(--bg-main);
      color: var(--text-body);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      overflow-x: hidden;
    }
    .glass-card {
      background: var(--card-glass);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--border-glass);
    }
    .glass-card:hover {
      border-color: rgba(0, 240, 255, 0.3);
      box-shadow: 0 10px 30px -10px rgba(0, 240, 255, 0.15);
    }
    .btn-glow {
      background: linear-gradient(135deg, #00f0ff 0%, #0ea5e9 100%);
      color: #031120;
      font-weight: 600;
      box-shadow: 0 0 20px rgba(0, 240, 255, 0.35);
      transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .btn-glow:hover {
      transform: translateY(-2px);
      box-shadow: 0 0 30px rgba(0, 240, 255, 0.6);
      color: #010810;
    }
    .btn-ghost {
      border: 1px solid rgba(0, 240, 255, 0.4);
      color: #f8fafc;
      background: rgba(0, 240, 255, 0.05);
      transition: all 0.25s ease;
    }
    .btn-ghost:hover {
      background: rgba(0, 240, 255, 0.15);
      border-color: #00f0ff;
      color: #00f0ff;
    }
    details summary::-webkit-details-marker {
      display:none;
    }