/* roulang page: index */
:root {
      --bg-dark: #030712;
      --bg-gradient: linear-gradient(180deg, #030712 0%, #070d1e 50%, #030712 100%);
      --accent-cyan: #00f2fe;
      --accent-blue: #4facfe;
    }
    body {
      background: var(--bg-dark);
      background-image: var(--bg-gradient);
      color: #cbd5e1;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      overflow-x: hidden;
    }
    .glass-panel {
      background: rgba(15, 23, 42, 0.75);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border: 1px solid rgba(255, 255, 255, 0.08);
      box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5), inset 0 1px 1px rgba(255, 255, 255, 0.12);
    }
    .text-gradient {
      background: linear-gradient(135deg, #ffffff 20%, #00f2fe 80%, #4facfe 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .btn-glow {
      background: linear-gradient(135deg, #00f2fe 0%, #4facfe 100%);
      box-shadow: 0 0 25px rgba(0, 242, 254, 0.4);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .btn-glow:hover {
      box-shadow: 0 0 38px rgba(0, 242, 254, 0.7);
      transform: translateY(-2px);
    }
    .nav-blur {
      background: rgba(3, 7, 18, 0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }