/* roulang page: index */
:root {
      --brand-navy: #0B1120;
      --brand-slate: #0F172A;
      --brand-blue: #2563EB;
      --brand-emerald: #10B981;
      --brand-amber: #F59E0B;
      --brand-border: rgba(226, 232, 240, 0.8);
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      background-color: #F8FAFC;
      color: #0F172A;
      overflow-x: hidden;
    }
    .code-font {
      font-family: 'JetBrains Mono', monospace;
    }
    .hero-glow {
      background: radial-gradient(circle at 50% 30%, rgba(37, 99, 235, 0.15), transparent 70%);
    }
    .glass-nav {
      background: rgba(255, 255, 255, 0.88);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }
    .interactive-card {
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .interactive-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
    }
    details summary::-webkit-details-marker {
      display: none;
    }