/* roulang page: index */
:root {
      --primary: #2563EB;
      --primary-hover: #1D4ED8;
      --primary-soft: #EFF6FF;
      --dark: #0F172A;
      --accent: #F59E0B;
      --bg: #F8FAFC;
      --white: #FFFFFF;
      --gray-50: #F8FAFC;
      --gray-100: #F1F5F9;
      --gray-200: #E2E8F0;
      --gray-300: #CBD5E1;
      --gray-400: #94A3B8;
      --gray-500: #64748B;
      --gray-600: #475569;
      --gray-700: #334155;
      --gray-800: #1E293B;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.1);
      --radius-lg: 12px;
      --radius-md: 8px;
      --radius-pill: 20px;
      --transition: 300ms ease;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg);
      color: var(--gray-700);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, input {
      font-family: inherit;
    }
    .container {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    /* 导航频道横向滚动隐藏滚动条 */
    .nav-tabs::-webkit-scrollbar {
      display: none;
    }
    .nav-tabs {
      -ms-overflow-style: none;
      scrollbar-width: none;
    }
    /* 卡片悬停升浮 */
    .hover-lift {
      transition: transform var(--transition), box-shadow var(--transition);
    }
    .hover-lift:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    /* 手风琴动画 */
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
    }
    .faq-item.open .faq-answer {
      max-height: 300px;
    }
    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }
    .faq-icon {
      transition: transform 0.3s ease;
    }
    /* 表单聚焦光环 */
    input:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(37,99,235,0.2);
    }
    /* 移动端适配 */
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column-reverse;
      }
      .nav-secondary {
        justify-content: flex-start;
      }
    }