/* roulang page: index */
:root {
      --primary: #0F52BA;
      --primary-hover: #0B3C8A;
      --accent: #10B981;
      --bg-page: #F8FAFC;
      --bg-card: #FFFFFF;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --card-shadow: 0 4px 20px -2px rgba(15, 82, 186, 0.05);
      --card-shadow-hover: 0 12px 32px -4px rgba(15, 82, 186, 0.12);
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    body {
      background-color: var(--bg-page);
      color: var(--text-main);
      overflow-x: hidden;
    }
    .custom-card {
      background: var(--bg-card);
      box-shadow: var(--card-shadow);
      transition: all 0.25s ease;
    }
    .custom-card:hover {
      box-shadow: var(--card-shadow-hover);
      transform: translateY(-2px);
    }
    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
    }
    .faq-content.open {
      max-height: 1000px;
      transition: max-height 0.3s ease-in-out;
    }