/* roulang page: index */
:root {
      --primary-color: #1E40AF;
      --secondary-color: #0284C7;
      --accent-color: #2563EB;
      --bg-slate: #F8FAFC;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
    }
    body {
      font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-slate);
      line-height: 1.7;
    }
    .custom-shadow {
      box-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.05), 0 8px 10px -6px rgba(15, 23, 42, 0.03);
    }
    .custom-shadow-hover:hover {
      box-shadow: 0 20px 30px -10px rgba(15, 23, 42, 0.1), 0 12px 15px -8px rgba(15, 23, 42, 0.06);
      transform: translateY(-4px);
    }
    .hero-bg {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.92) 0%, rgba(30, 64, 175, 0.88) 100%), url('/assets/images/215e06dc1363a9f2.webp') center/cover no-repeat;
    }
    .dark-section-bg {
      background-color: #0F172A;
    }
    .faq-content {
      transition: max-height 0.3s ease-out, opacity 0.3s ease-out;
      max-height: 0;
      overflow: hidden;
      opacity: 0;
    }
    .faq-content.open {
      max-height: 250px;
      opacity: 1;
    }