/* roulang page: index */
:root {
      --primary: #00D084;
      --primary-hover: #00B371;
      --secondary: #0F1E24;
      --secondary-light: #16262E;
      --dark-card: #091216;
      --bg-light: #F4F7F6;
      --text-main: #0F1E24;
      --text-body: #3A4D53;
      --text-muted: #6E8289;
      --border-color: #E5EBEA;
      --alert-warn: #FF6B4A;
    }

    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }

    body {
      color: var(--text-body);
      background-color: #FFFFFF;
      line-height: 1.75;
      margin: 0;
      padding: 0;
    }

    section {
      scroll-margin-top: 84px;
    }

    .brand-btn-primary {
      background-color: var(--primary);
      color: #0F1E24;
      font-weight: 600;
      transition: all 0.25s ease-in-out;
    }
    .brand-btn-primary:hover {
      background-color: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px -4px rgba(0, 208, 132, 0.4);
    }

    .brand-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      box-shadow: 0 8px 24px -4px rgba(15, 30, 36, 0.05);
      transition: all 0.3s ease;
    }
    .brand-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 14px 30px -4px rgba(15, 30, 36, 0.09);
      border-color: rgba(0, 208, 132, 0.4);
    }

    .badge-pill {
      background: rgba(0, 208, 132, 0.12);
      color: #008755;
      font-size: 0.825rem;
      padding: 0.25rem 0.75rem;
      border-radius: 9999px;
      font-weight: 600;
    }

    /* FAQ 手风琴过渡 */
    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .faq-item.active .faq-content {
      max-height: 200px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }

    /* 移动端菜单抽屉 */
    #mobileMenu {
      transition: transform 0.3s ease-in-out;
    }