/* roulang page: index */
:root {
      --primary: #1E56A0;
      --primary-dark: #153E75;
      --accent: #16BFFD;
      --accent-active: #00B4D8;
      --dark-navy: #0B192C;
      --slate-title: #0F172A;
      --slate-body: #334155;
      --slate-muted: #64748B;
      --bg-light: #F8FAFC;
      --bg-card: #FFFFFF;
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    body {
      background-color: var(--bg-light);
      color: var(--slate-body);
      overflow-x: hidden;
    }
    .custom-card-shadow {
      box-shadow: 0 4px 20px -4px rgba(30, 86, 160, 0.06);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .custom-card-shadow:hover {
      box-shadow: 0 16px 32px -6px rgba(30, 86, 160, 0.12);
      transform: translateY(-4px);
    }
    .hero-gradient {
      background: linear-gradient(135deg, rgba(248,250,252,0.96) 0%, rgba(238,244,248,0.92) 100%);
    }
    details summary::-webkit-details-marker {
      display: none;
    }
    details[open] summary .faq-icon {
      transform: rotate(180deg);
      color: var(--primary);
    }