/* roulang page: index */
:root {
      --bg-dark: #070b14;
      --bg-navy: #0c1427;
      --primary-blue: #2563eb;
      --primary-cyan: #06b6d4;
      --border-glow: rgba(56, 189, 248, 0.2);
    }
    body {
      background-color: var(--bg-dark);
      color: #f8fafc;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.75;
      overflow-x: hidden;
    }
    .glass-panel {
      background: rgba(15, 23, 42, 0.7);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid rgba(56, 189, 248, 0.16);
      box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    }
    .glow-btn {
      background: linear-gradient(135deg, #2563eb 0%, #06b6d4 100%);
      box-shadow: 0 0 22px rgba(37, 99, 235, 0.5);
      transition: all 0.3s ease;
    }
    .glow-btn:hover {
      box-shadow: 0 0 32px rgba(56, 189, 248, 0.8);
      transform: translateY(-2px);
    }
    .glow-border-card {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      border: 1px solid rgba(56, 189, 248, 0.15);
    }
    .glow-border-card:hover {
      border-color: rgba(56, 189, 248, 0.55);
      box-shadow: 0 0 25px rgba(6, 182, 212, 0.2);
      transform: translateY(-3px);
    }
    .bg-radial-glow {
      background: radial-gradient(circle at 50% 20%, rgba(37, 99, 235, 0.15) 0%, rgba(7, 11, 20, 0) 70%);
    }