/* roulang page: index */
:root {
      --bg-dark: #090D14;
      --bg-card: #111622;
      --accent-cyan: #00F2B6;
      --accent-radar: #05D5A1;
      --border-color: rgba(255, 255, 255, 0.08);
    }
    * {
      box-sizing: border-box;
    }
    body {
      background-color: var(--bg-dark);
      color: #F8FAFC;
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
      line-height: 1.75;
      overflow-x: hidden;
    }
    .glow-border {
      border: 1px solid var(--border-color);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .glow-border:hover {
      border-color: rgba(0, 242, 182, 0.4);
      box-shadow: 0 0 25px rgba(0, 242, 182, 0.12);
    }
    .glass-nav {
      background: rgba(9, 13, 20, 0.88);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .radar-grid {
      background-image: radial-gradient(rgba(0, 242, 182, 0.1) 1px, transparent 1px);
      background-size: 32px 32px;
    }
    .hero-glow {
      background: radial-gradient(circle at 50% 30%, rgba(0, 242, 182, 0.15) 0%, rgba(9, 13, 20, 0) 70%);
    }
    .btn-primary {
      background: #00F2B6;
      color: #090D14;
      font-weight: 600;
      transition: all 0.25s ease;
    }
    .btn-primary:hover {
      background: #05D5A1;
      box-shadow: 0 0 20px rgba(0, 242, 182, 0.45);
      transform: translateY(-1px);
    }
    .btn-secondary {
      background: rgba(255, 255, 255, 0.05);
      color: #F8FAFC;
      border: 1px solid rgba(255, 255, 255, 0.15);
      transition: all 0.25s ease;
    }
    .btn-secondary:hover {
      background: rgba(255, 255, 255, 0.12);
      border-color: rgba(0, 242, 182, 0.4);
      color: #00F2B6;
    }