/* roulang page: index */
:root {
      --primary: #1e3a8a;
      --primary-light: #3b82f6;
      --accent: #6366f1;
      --cyan: #06b6d4;
      --dark-bg: #0b0f19;
      --light-bg: #f8fafc;
      --text-main: #0f172a;
      --text-muted: #475569;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      color: var(--text-main);
      background-color: var(--light-bg);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    }
    .brand-gradient {
      background: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 50%, #6366f1 100%);
    }
    .brand-text-gradient {
      background: linear-gradient(135deg, #2563eb 0%, #4f46e5 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-mask-video {
      background: linear-gradient(180deg, rgba(11, 15, 25, 0.82) 0%, rgba(11, 15, 25, 0.94) 100%);
    }
    .card-shadow {
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.04);
    }
    .btn-hover-effect {
      transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .btn-hover-effect:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 24px -6px rgba(59, 130, 246, 0.35);
    }