/* roulang page: index */
:root {
      --brand-dark: #0F172A;
      --brand-navy: #0B0F19;
      --brand-primary: #2563EB;
      --brand-accent: #00D2B4;
      --brand-surface: #F4F6F9;
      --brand-border: #E2E8F0;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      color: #1E293B;
      background-color: #FFFFFF;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    .custom-container {
      width: 100%;
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.25rem;
      padding-right: 1.25rem;
    }
    .hero-bg {
      background-image: linear-gradient(135deg, rgba(15, 23, 42, 0.94) 0%, rgba(11, 15, 25, 0.88) 100%), url('/assets/images/7f0aa0870a9d9de9.webp');
      background-size: cover;
      background-position: center;
    }
    .dark-concept-bg {
      background-image: linear-gradient(180deg, rgba(11, 15, 25, 0.96) 0%, rgba(15, 23, 42, 0.98) 100%), url('/assets/images/0cb2952171bf6342.webp');
      background-size: cover;
      background-position: center;
    }
    .card-shadow {
      box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
      transition: all 0.25s ease-in-out;
    }
    .card-shadow:hover {
      box-shadow: 0 12px 28px -4px rgba(15, 23, 42, 0.12);
      transform: translateY(-2px);
    }
    .border-glow:hover {
      border-color: #00D2B4;
    }
    .mono-num {
      font-variant-numeric: tabular-nums;
      font-family: 'SFMono-Regular', Menlo, Monaco, Consolas, monospace;
    }