/* roulang page: index */
:root {
      --bg-base: #050814;
      --bg-surface: #0a1128;
      --bg-card: rgba(15, 23, 42, 0.72);
      --border-glow: rgba(0, 210, 255, 0.22);
      --cyan-core: #00d2ff;
      --blue-core: #1e6bff;
      --text-main: #f8fafc;
      --text-muted: #94a3b8;
    }
    
    body {
      background-color: var(--bg-base);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      overflow-x: hidden;
    }

    .glass-card {
      background: var(--bg-card);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--border-glow);
      box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.6);
      transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .glass-card:hover {
      border-color: rgba(0, 210, 255, 0.55);
      box-shadow: 0 0 30px rgba(0, 210, 255, 0.22);
      transform: translateY(-4px);
    }

    .btn-glow-primary {
      background: linear-gradient(135deg, #1e6bff 0%, #00d2ff 100%);
      color: #ffffff;
      box-shadow: 0 0 20px rgba(0, 210, 255, 0.35);
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-glow-primary:hover {
      box-shadow: 0 0 32px rgba(0, 210, 255, 0.65);
      transform: scale(1.02);
    }

    .btn-glow-outline {
      border: 1px solid rgba(0, 210, 255, 0.4);
      background: rgba(10, 17, 40, 0.6);
      backdrop-filter: blur(8px);
      color: #00d2ff;
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-glow-outline:hover {
      background: rgba(0, 210, 255, 0.15);
      border-color: #00d2ff;
      box-shadow: 0 0 20px rgba(0, 210, 255, 0.3);
    }

    .circuit-grid-bg {
      background-image: 
        radial-gradient(circle at 50% 50%, rgba(30, 107, 255, 0.08) 0%, transparent 65%),
        linear-gradient(to right, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
      background-size: 100% 100%, 48px 48px, 48px 48px;
    }

    details summary::-webkit-details-marker {
      display: none;
    }
    details summary {
      list-style: none;
    }
    details[open] .faq-icon {
      transform: rotate(180deg);
      color: var(--cyan-core);
    }