/* roulang page: index */
:root {
      --primary: hsl(265, 85%, 58%);
      --accent: hsl(165, 90%, 48%);
      --bg-dark: hsl(240, 16%, 8%);
      --bg-card: rgba(255, 255, 255, 0.04);
      --border-color: rgba(255, 255, 255, 0.1);
      --text-main: #f8fafc;
      --text-muted: #94a3b8;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      background-color: var(--bg-dark);
      color: var(--text-main);
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      line-height: 1.75;
      overflow-x: hidden;
      scroll-behavior: smooth;
    }
    .hero-glow {
      position: absolute;
      top: -10%;
      left: 50%;
      transform: translateX(-50%);
      width: 900px;
      height: 500px;
      background: radial-gradient(circle, rgba(139, 92, 246, 0.28) 0%, rgba(16, 185, 129, 0.08) 50%, rgba(14, 15, 21, 0) 80%);
      pointer-events: none;
      z-index: 0;
    }
    .glass-nav {
      background: rgba(14, 15, 21, 0.85);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .custom-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .custom-card:hover {
      background: rgba(255, 255, 255, 0.07);
      border-color: rgba(16, 185, 129, 0.5);
      transform: translateY(-3px);
      box-shadow: 0 16px 32px rgba(0, 0, 0, 0.4);
    }
    .btn-glow {
      transition: all 0.25s ease;
      box-shadow: 0 0 16px rgba(16, 185, 129, 0.25);
    }
    .btn-glow:hover {
      box-shadow: 0 0 24px rgba(16, 185, 129, 0.45);
      transform: translateY(-2px);
    }
    details summary::-webkit-details-marker {
      display: none;
    }