/* roulang page: index */
:root {
      --brand-primary: #1e40af;
      --brand-accent: #0284c7;
      --bg-light: #f8fafc;
      --border-soft: #e2e8f0;
      --text-main: #0f172a;
      --text-muted: #64748b;
      --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
      --shadow-card: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 10px 15px -3px rgba(0, 0, 0, 0.03);
      --shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      color: var(--text-main);
      background-color: #ffffff;
      -webkit-font-smoothing: antialiased;
    }
    .custom-card {
      transition: transform 0.28s ease, box-shadow 0.28s ease;
      box-shadow: var(--shadow-card);
    }
    .custom-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .hero-stack-center {
      z-index: 20;
    }
    .hero-stack-left {
      transform: rotate(-3deg) translateY(12px);
      z-index: 10;
    }
    .hero-stack-right {
      transform: rotate(3deg) translateY(12px);
      z-index: 10;
    }
    details > summary::-webkit-details-marker {
      display: none;
    }