/* 全局基础样式 */
    :root { --theme: #ff4757; --bg: #f1f2f6; --text: #2f3542; }
    body { font-family: sans-serif; background: var(--bg); color: var(--text); margin: 0; }
    a { text-decoration: none; color: inherit; }
    
    /* 顶部与主体 */
    .header { background: #fff; padding: 15px 0; border-bottom: 2px solid var(--theme); text-align: center; }
    .logo { font-size: 26px; font-weight: 900; color: var(--theme); }
    .article-wrap { max-width: 900px; margin: 30px auto; background: #fff; padding: 40px; border-radius: 8px; box-shadow: 0 4px 15px rgba(0,0,0,0.05); }
    .article-title { font-size: 26px; text-align: center; margin-top: 0; }
    .meta { text-align: center; color: #747d8c; font-size: 14px; margin-bottom: 30px; }
    
    /* 图片与翻页 */
    .img-box { text-align: center; margin-bottom: 20px; }
    .img-box img { max-width: 100%; border-radius: 6px; cursor: pointer; }
    .controls { display: flex; justify-content: center; gap: 15px; margin: 30px 0; }
    .btn { padding: 10px 25px; border-radius: 4px; border: 1px solid #dfe4ea; font-weight: bold; transition: 0.3s; }
    .btn:hover { background: #f1f2f6; }
    .btn.next { background: var(--theme); color: #fff; border-color: var(--theme); }
    .btn.next:hover { background: #ff6b81; }

    /* ================= 修复版：SEO 文章模块 ================= */
    .seo-box { background: #f8f9fa; border: 1px solid #dfe4ea; border-radius: 8px; padding: 25px; margin-top: 30px; position: relative; }
    .seo-title { font-size: 16px; margin: 0 0 15px 0; color: #2f3542; border-left: 4px solid var(--theme); padding-left: 10px; font-weight: bold; }
    
    /* 文本包裹区 */
    .seo-content { font-size: 14px; color: #57606f; line-height: 1.8; max-height: 180px; overflow: hidden; transition: max-height 0.4s ease; }
    .seo-content p { margin: 0 0 10px 0; text-indent: 2em; }
    .seo-content.is-expanded { max-height: none; } /* 展开后取消高度限制 */
    
    /* 遮罩层（放在文字层外部，避免错乱） */
    .seo-mask { position: absolute; bottom: 60px; left: 0; width: 100%; height: 80px; background: linear-gradient(to bottom, rgba(248,249,250,0), rgba(248,249,250,1)); pointer-events: none; }
    
    /* 按钮容器 */
    .seo-action { text-align: center; margin-top: 15px; position: relative; z-index: 2; }
    .seo-btn { display: inline-block; padding: 6px 24px; background: #fff; border: 1px solid var(--theme); border-radius: 20px; color: var(--theme); font-size: 13px; cursor: pointer; transition: 0.3s; user-select: none; }
    .seo-btn:hover { background: var(--theme); color: #fff; }
    /* ========================================================== */

    /* 底部推荐矩阵 */
    .seo-text { max-width: 900px; margin: 0 auto 40px; background: #fff; padding: 30px; border-radius: 8px; box-shadow: 0 4px 15px rgba(0,0,0,0.05); }
    .text-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 15px; }
    .text-grid a { display: block; padding: 10px; background: #f8f9fa; border-left: 3px solid var(--theme); font-size: 14px; transition: 0.3s; }
    .text-grid a:hover { background: #ffeaa7; color: #d63031; border-color: #d63031; }
    
    /* 移动端适配 */
    @media(max-width: 768px){ 
      .text-grid { grid-template-columns: 1fr; } 
      .article-wrap { padding: 20px; margin: 15px; } 
      .seo-text { padding: 20px; margin: 15px; }
      .seo-box { padding: 15px; }
    }
    
    .footer { background: #2f3542; color: #ced6e0; padding: 40px 20px; text-align: center; }
    .footer a { color: #fff; margin: 0 10px; }