/* roulang page: index */
:root {
      --primary: #1A5F7A;
      --primary-deep: #0F3D52;
      --accent: #F49E4C;
      --accent-deep: #E08A2E;
      --soft-bg: #FAFBFB;
      --card-bg: #FFFFFF;
      --section-bg: #F3F6F8;
      --text-main: #1E293B;
      --text-secondary: #64748B;
      --text-muted: #94A3B8;
      --border-light: #E8ECF0;
      --shadow-card: 0 1px 3px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.06);
      --transition: 0.2s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      background-color: var(--soft-bg);
      color: var(--text-main);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    .font-display {
      font-family: "Inter", "Segoe UI", system-ui, sans-serif;
    }
    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    @media (max-width: 640px) {
      .container-custom {
        padding-left: 16px;
        padding-right: 16px;
      }
    }
    /* 导航搜索框焦点 */
    .search-input:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(26,95,122,0.15);
    }
    /* 手风琴动画 */
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding-bottom: 20px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    /* 卡片hover */
    .card-hover:hover {
      transform: translateY(-2px);
      box-shadow: var(--shadow-card-hover);
      transition: transform 0.2s, box-shadow 0.2s;
    }
    /* 错位排版图片容器 */
    .alt-img {
      border-radius: 16px;
      object-fit: cover;
      width: 100%;
      height: auto;
      min-height: 240px;
    }
    @media (min-width: 768px) {
      .alt-img {
        min-height: 300px;
      }
    }
    /* 按钮动效 */
    .btn-primary {
      background-color: var(--primary);
      color: white;
      border-radius: 8px;
      padding: 14px 32px;
      font-weight: 600;
      font-size: 16px;
      letter-spacing: 0.5px;
      transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background-color: #154E66;
      transform: translateY(-2px);
      box-shadow: 0 8px 16px rgba(26,95,122,0.2);
    }
    .btn-accent {
      background-color: var(--accent);
      color: white;
      border-radius: 8px;
      padding: 14px 32px;
      font-weight: 600;
      font-size: 16px;
      letter-spacing: 0.5px;
      transition: background 0.2s, transform 0.2s;
      display: inline-block;
      text-align: center;
    }
    .btn-accent:hover {
      background-color: #E08A2E;
      transform: translateY(-2px);
    }
    .btn-ghost {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      border-radius: 8px;
      padding: 12px 28px;
      font-weight: 600;
      transition: all 0.2s;
    }
    .btn-ghost:hover {
      background: var(--primary);
      color: white;
    }
    /* 移动端全宽按钮 */
    @media (max-width: 640px) {
      .btn-primary, .btn-accent, .btn-ghost {
        width: 100%;
        display: block;
      }
    }