/* roulang page: index */
:root {
      --primary-blue: #0f4c81;
      --data-cyan: #00a8cc;
      --data-teal: #00b4d8;
      --bg-dark: #0a192f;
      --bg-light: #f8fafc;
      --text-main: #0f172a;
      --text-muted: #475569;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      color: var(--text-main);
      background-color: var(--bg-light);
      line-height: 1.7;
    }
    .hero-code-bg {
      background: #0d1b2a;
      border: 1px solid rgba(0, 168, 204, 0.25);
      box-shadow: 0 20px 40px -15px rgba(10, 25, 47, 0.5);
    }
    .shadow-soft {
      box-shadow: 0 4px 20px rgba(15, 23, 42, 0.06);
    }
    .shadow-soft-hover:hover {
      box-shadow: 0 12px 30px rgba(15, 23, 42, 0.12);
      transform: translateY(-3px);
    }