/* roulang page: index */
:root {
      --primary: #1A56DB;
      --primary-hover: #1646B6;
      --accent: #0284C7;
      --accent-warm: #F97316;
      --text-main: #0F172A;
      --text-muted: #475569;
      --text-light: #64748B;
      --bg-light: #F8FAFC;
      --card-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
      --card-hover-shadow: 0 16px 32px -4px rgba(26, 86, 219, 0.12);
    }
    html { scroll-behavior: smooth; }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: #ffffff;
    }
    .custom-card {
      transition: transform 0.28s ease, box-shadow 0.28s ease, border-color 0.28s ease;
      box-shadow: var(--card-shadow);
    }
    .custom-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
      border-color: rgba(26, 86, 219, 0.28);
    }
    .hero-bg-overlay {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.88) 0%, rgba(26, 86, 219, 0.82) 100%),
                  url('/assets/images/519ace2c787e1af5.webp') center/cover no-repeat;
    }
    .dark-matrix-bg {
      background: radial-gradient(circle at 80% 20%, rgba(26, 86, 219, 0.25) 0%, transparent 50%),
                  radial-gradient(circle at 20% 80%, rgba(2, 132, 199, 0.2) 0%, transparent 60%),
                  #0F172A;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .faq-item.active .faq-answer {
      max-height: 240px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }