/* roulang page: index */
:root {
      --primary: #2563eb;
      --primary-dark: #0f172a;
      --accent-cyan: #06b6d4;
      --accent-green: #10b981;
      --text-main: #0f172a;
      --text-muted: #475569;
    }
    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }
    body {
      color: #334155;
      background-color: #ffffff;
      line-height: 1.7;
    }
    .custom-shadow {
      box-shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.05), 0 4px 10px -2px rgba(0, 0, 0, 0.02);
    }
    .hero-gradient {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.95) 0%, rgba(15, 23, 42, 0.85) 100%);
    }