/* roulang page: index */
:root {
      --primary: #0F4C81;
      --primary-dark: #0A2540;
      --accent: #00A3E0;
      --slate-dark: #0B132B;
      --bg-light: #F8FAFC;
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    .custom-hero-bg {
      background-image: linear-gradient(135deg, rgba(10, 37, 64, 0.92) 0%, rgba(15, 76, 129, 0.88) 100%), url('/assets/images/1799c425addf091b.jpg');
      background-size: cover;
      background-position: center;
    }
    .custom-dark-section {
      background-color: var(--slate-dark);
      background-image: radial-gradient(#1e293b 1px, transparent 1px);
      background-size: 24px 24px;
    }
    .faq-answer {
      transition: max-height 0.3s ease-out, opacity 0.2s ease-out;
      max-height: 0;
      overflow: hidden;
      opacity: 0;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      opacity: 1;
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }