/* roulang page: index */
:root {
      --primary: #0F172A;
      --accent: #0284C7;
      --secondary: #10B981;
      --bg-dark: #0B0F19;
      --bg-light: #F8FAFC;
    }
    body {
      color: #0F172A;
      background-color: #F8FAFC;
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      overflow-x: hidden;
    }
    .hero-diagonal {
      clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%);
    }
    @media (max-width: 768px) {
      .hero-diagonal {
        clip-path: polygon(0 0, 100% 0, 100% 94%, 0 100%);
      }
    }
    .subtle-grid {
      background-size: 32px 32px;
      background-image: 
        linear-gradient(to right, rgba(255, 255, 255, 0.05) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
    }
    .light-grid {
      background-size: 32px 32px;
      background-image: 
        linear-gradient(to right, rgba(15, 23, 42, 0.03) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(15, 23, 42, 0.03) 1px, transparent 1px);
    }
    .card-transition {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-transition:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
      border-color: rgba(2, 132, 199, 0.4);
    }
    /* 平滑折叠动画辅助 */
    .faq-answer {
      transition: max-height 0.35s ease-out, opacity 0.3s ease;
    }