/* roulang page: index */
:root {
      --primary: #1D4ED8;
      --primary-hover: #1E40AF;
      --secondary: #0F172A;
      --accent-green: #059669;
      --bg-light: #FFFFFF;
      --bg-alt: #F8FAFC;
      --bg-dark: #0B132B;
      --text-main: #0F172A;
      --text-muted: #475569;
      --border-color: #E2E8F0;
      --shadow-card: 0 4px 6px -1px rgba(15, 23, 42, 0.05), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
      --shadow-hover: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
    }
    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
    }
    .custom-card-shadow {
      box-shadow: var(--shadow-card);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .custom-card-shadow:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-3px);
    }
    details summary::-webkit-details-marker {
      display:none;
    }