/* roulang page: index */
:root {
      --primary: #0F52BA;
      --primary-dark: #1E40AF;
      --secondary: #64748B;
      --accent: #06B6D4;
      --bg-base: #F8FAFC;
      --bg-surface: #FFFFFF;
      --text-main: #0F172A;
      --text-body: #334155;
      --text-muted: #94A3B8;
      --border-subtle: #E2E8F0;
    }
    
    body {
      background-color: var(--bg-base);
      color: var(--text-body);
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
      text-rendering: optimizeLegibility;
      -webkit-font-smoothing: antialiased;
    }

    .hero-angled-bg {
      clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%);
    }
    @media (max-width: 768px) {
      .hero-angled-bg {
        clip-path: polygon(0 0, 100% 0, 100% 95%, 0 100%);
      }
    }

    .card-transition {
      transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.25s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.25s ease;
    }
    .card-transition:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 30px -10px rgba(15, 23, 42, 0.08);
      border-color: #CBD5E1;
    }

    /* 手风琴平滑过渡 */
    .faq-body {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
    }
    .faq-item.active .faq-body {
      max-height: 500px;
      transition: max-height 0.35s ease-in-out;
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }