/* roulang page: index */
:root {
      --primary: #1e40af;
      --secondary: #0284c7;
      --accent-emerald: #10b981;
      --accent-amber: #f59e0b;
      --bg-base: #f8fafc;
      --text-main: #0f172a;
      --text-body: #334155;
      --text-muted: #64748b;
      --border-color: #e2e8f0;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-base);
      color: var(--text-body);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }
    .custom-container {
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.25rem;
      padding-right: 1.25rem;
    }
    .hero-banner-bg {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.88) 0%, rgba(30, 64, 175, 0.82) 100%), url('/assets/images/c17bc6c376495b04.webp') center/cover no-repeat;
    }
    .section-dark-bg {
      background: linear-gradient(180deg, #0b1329 0%, #0f172a 100%);
    }
    .card-transition {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-transition:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 28px -4px rgba(30, 64, 175, 0.14);
    }
    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .faq-active .faq-content {
      max-height: 240px;
    }
    .faq-active .faq-chevron {
      transform: rotate(180deg);
    }