/* roulang page: index */
:root {
      --primary: #0B192C;
      --secondary: #1E2A38;
      --accent: #00C9A7;
      --accent-glow: rgba(0, 201, 167, 0.2);
      --bg-page: #F8FAFC;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --radius: 12px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
      --shadow-lg: 0 10px 25px -5px rgba(0,0,0,0.08);
    }
    
    html {
      scroll-behavior: smooth;
    }
    
    body {
      background-color: var(--bg-page);
      color: var(--text-main);
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      line-height: 1.75;
      overflow-x: hidden;
    }

    .code-font {
      font-family: 'Fira Code', Consolas, monospace;
    }

    .glass-nav {
      background: rgba(11, 25, 44, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }

    .hero-glow {
      background: radial-gradient(circle at 50% 30%, rgba(0, 201, 167, 0.12) 0%, rgba(11, 25, 44, 0) 70%);
    }

    .tech-card {
      transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
      border: 1px solid var(--border-color);
      background: #FFFFFF;
    }
    .tech-card:hover {
      border-color: var(--accent);
      transform: translateY(-4px);
      box-shadow: 0 12px 30px -10px rgba(0, 201, 167, 0.15);
    }

    details summary::-webkit-details-marker {
      display: none;
    }
    details[open] summary .faq-icon {
      transform: rotate(180deg);
    }