/* roulang page: index */
:root {
      --primary: #0284c7;
      --primary-dark: #0369a1;
      --accent: #0d9488;
      --bg-page: #f8fafc;
      --surface: #ffffff;
      --text-main: #0f172a;
      --text-muted: #334155;
      --border-color: #e2e8f0;
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    }
    body {
      background-color: var(--bg-page);
      color: var(--text-main);
      overflow-x: hidden;
    }
    .custom-card-shadow {
      box-shadow: 0 1px 3px rgba(0,0,0,0.05), 0 10px 15px -3px rgba(0,0,0,0.03);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .custom-card-shadow:hover {
      box-shadow: 0 20px 25px -5px rgba(2, 132, 199, 0.08);
      transform: translateY(-4px);
    }
    .hero-bg {
      background: linear-gradient(135deg, rgba(8, 15, 30, 0.92) 0%, rgba(12, 74, 110, 0.85) 100%), url('/assets/images/27a3e3b0c36e3633.webp') center/cover no-repeat;
    }
    .dark-flow-bg {
      background: radial-gradient(circle at 50% 50%, #0c213d 0%, #070e1e 100%), url('/assets/images/359a94016a7a22a5.webp') center/cover no-repeat;
    }
    .cta-bg {
      background: linear-gradient(rgba(15, 23, 42, 0.94), rgba(15, 23, 42, 0.96)), url('/assets/images/7d4b61f993103c97.webp') center/cover no-repeat;
    }
    .quiz-option.active {
      border-color: var(--primary);
      background-color: #f0f9ff;
    }