/* roulang page: index */
:root {
      --bg-dark: #0b1120;
      --bg-card: rgba(30, 41, 59, 0.7);
      --primary-blue: #2563eb;
      --accent-cyan: #06b6d4;
      --accent-gold: #f59e0b;
      --border-line: rgba(255, 255, 255, 0.08);
      --text-muted: #94a3b8;
    }
    html { scroll-behavior: smooth; }
    body {
      background-color: var(--bg-dark);
      color: #e2e8f0;
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    .glass-panel {
      background: var(--bg-card);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid var(--border-line);
      box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    }
    .neon-btn {
      background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
      transition: all 0.25s ease-in-out;
      box-shadow: 0 0 0 1px rgba(59, 130, 246, 0.5);
    }
    .neon-btn:hover {
      box-shadow: 0 0 20px rgba(37, 99, 235, 0.65);
      transform: translateY(-1px);
    }
    .neon-btn-cyan {
      background: linear-gradient(135deg, #0891b2 0%, #06b6d4 100%);
      box-shadow: 0 0 0 1px rgba(6, 182, 212, 0.5);
    }
    .neon-btn-cyan:hover {
      box-shadow: 0 0 20px rgba(6, 182, 212, 0.65);
      transform: translateY(-1px);
    }
    .tag-badge {
      display: inline-flex;
      align-items: center;
      padding: 0.2rem 0.65rem;
      border-radius: 9999px;
      font-size: 0.75rem;
      font-weight: 500;
      background: rgba(37, 99, 235, 0.15);
      border: 1px solid rgba(59, 130, 246, 0.3);
      color: #93c5fd;
    }
    .section-title {
      font-size: 1.875rem;
      line-height: 2.25rem;
      font-weight: 700;
      color: #f8fafc;
      letter-spacing: -0.02em;
    }
    @media (min-width: 768px) {
      .section-title {
        font-size: 2.25rem;
        line-height: 2.5rem;
      }
    }
    details summary::-webkit-details-marker { display: none; }