/* roulang page: index */
:root {
      --primary: #1E3A8A;
      --secondary: #0284C7;
      --teal: #0D9488;
      --dark: #0F172A;
      --surface: #F8FAFC;
      --border-color: #E2E8F0;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background-color: #F8FAFC;
      color: #334155;
      overflow-x: hidden;
    }
    .custom-gradient-bg {
      background: linear-gradient(135deg, #1E3A8A 0%, #0284C7 60%, #0D9488 100%);
    }
    .text-gradient {
      background: linear-gradient(135deg, #0284C7 0%, #0D9488 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .glass-nav {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }
    .shadow-soft {
      box-shadow: 0 10px 30px -10px rgba(15, 23, 42, 0.08);
    }
    .shadow-card-hover {
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .shadow-card-hover:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 35px -12px rgba(2, 132, 199, 0.18);
    }
    details summary::-webkit-details-marker {
      display: none;
    }