/* roulang page: index */
:root {
      --primary: #0F4C81;
      --secondary: #0284C7;
      --dark-navy: #0A192F;
      --bg-slate: #F8FAFC;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      color: #1e293b;
      background-color: var(--bg-slate);
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
    }
    .custom-card-shadow {
      box-shadow: 0 4px 20px -2px rgba(15, 76, 129, 0.08);
    }
    .hero-bg-overlay {
      background: linear-gradient(135deg, rgba(10, 25, 47, 0.88) 0%, rgba(15, 76, 129, 0.75) 100%);
    }
    details summary::-webkit-details-marker {
      display: none;
    }
    details[open] summary svg {
      transform: rotate(180deg);
    }