/* roulang page: index */
:root {
      --primary: #1E40AF;
      --primary-hover: #1D4ED8;
      --accent: #EA580C;
      --bg-light: #F8FAFC;
      --bg-alt: #F1F5F9;
      --text-main: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --card-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.06), 0 2px 6px -1px rgba(15, 23, 42, 0.04);
      --card-hover-shadow: 0 12px 28px -4px rgba(30, 64, 175, 0.12), 0 4px 10px -2px rgba(15, 23, 42, 0.06);
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    body {
      color: var(--text-body);
      background-color: var(--bg-light);
      -webkit-font-smoothing: antialiased;
    }
    .card-panel {
      background: #FFFFFF;
      border: 1px solid rgba(226, 232, 240, 0.85);
      box-shadow: var(--card-shadow);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }
    .card-panel:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .faq-item.active .faq-answer {
      max-height: 320px;
    }
    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
    }
    .skew-hero-img {
      clip-path: polygon(6% 0, 100% 0, 94% 100%, 0% 100%);
    }
    @media (max-width: 1024px) {
      .skew-hero-img {
        clip-path: none;
      }
    }