/* roulang page: index */
:root {
      --primary: #2563eb;
      --primary-dark: #1d4ed8;
      --accent-cyan: #06b6d4;
      --accent-orange: #f97316;
      --bg-light: #f8fafc;
      --text-main: #0f172a;
      --text-muted: #64748b;
      --border-color: #e2e8f0;
    }
    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    }
    body {
      overflow-x: hidden;
      background-color: #ffffff;
      color: #334155;
    }
    .shadow-card {
      box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
    }
    .shadow-card-hover:hover {
      box-shadow: 0 14px 28px -4px rgba(37, 99, 235, 0.12);
      transform: translateY(-4px);
    }
    .hero-glow {
      background: radial-gradient(circle at 50% 30%, rgba(37, 99, 235, 0.08) 0%, rgba(255, 255, 255, 0) 70%);
    }
    .code-console {
      background: #090d16;
      border: 1px solid #1e293b;
    }