/* roulang page: index */
:root {
      --brand-gradient: linear-gradient(135deg, #00D2B4 0%, #0284C7 100%);
      --glow-border: rgba(255, 255, 255, 0.08);
      --card-bg: #111827;
      --bg-dark: #0B0F19;
    }
    body {
      background-color: var(--bg-dark);
      color: #F1F5F9;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
      overflow-x: hidden;
    }
    .gradient-text {
      background: var(--brand-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .gradient-btn {
      background: var(--brand-gradient);
      box-shadow: 0 4px 20px rgba(0, 210, 180, 0.25);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .gradient-btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(2, 132, 199, 0.35);
    }
    .card-glass {
      background-color: rgba(17, 24, 39, 0.7);
      backdrop-filter: blur(12px);
      border: 1px solid var(--glow-border);
      transition: all 0.3s ease;
    }
    .card-glass:hover {
      border-color: rgba(0, 210, 180, 0.3);
      box-shadow: 0 10px 30px -10px rgba(0, 210, 180, 0.15);
    }