/* roulang page: index */
:root {
      --primary: #0F52BA;
      --primary-hover: #0d449c;
      --primary-deep: #0A2540;
      --primary-dark: #0F172A;
      --accent: #0D9488;
      --accent-light: #F0FDFA;
      --bg-light: #F8FAFC;
      --bg-card: #FFFFFF;
      --text-main: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --border-subtle: #E2E8F0;
      --shadow-card: 0 4px 20px -2px rgba(15, 82, 186, 0.06);
      --shadow-hover: 0 12px 30px -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 {
      color: var(--text-body);
      background-color: #FFFFFF;
      line-height: 1.65;
      overflow-x: hidden;
    }
    
    .med-shadow {
      box-shadow: var(--shadow-card);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    
    .med-shadow:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-3px);
      border-color: #BFDBFE;
    }
    
    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s cubic-bezier(0, 1, 0, 1);
    }
    
    .faq-item.active .faq-content {
      max-height: 500px;
      transition: max-height 0.4s ease-in-out;
    }
    
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }