/* 打印 / 导出 PDF：只留正文 */
@media print {
  body::before,
  body::after,
  .site-nav,
  .mobile-menu,
  .toc,
  .site-foot,
  .article-foot,
  .code-copy,
  .hero-hint {
    display: none !important;
  }

  html,
  body {
    background: #fff !important;
    color: #000 !important;
  }

  .article-page {
    padding: 0 !important;
  }

  .article-shell {
    display: block !important;
    max-width: none !important;
  }

  .article-head,
  .article-head h1,
  .prose,
  .prose h2,
  .prose h3,
  .prose h4,
  .prose strong {
    color: #000 !important;
  }

  .article-head {
    border-bottom: 1px solid #999;
  }

  .article-head h1 {
    font-size: 20pt;
  }

  .prose {
    font-size: 12pt;
    line-height: 1.55;
  }

  .prose a {
    color: #000 !important;
    border-bottom: 0 !important;
  }

  .prose a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 8.5pt;
    color: #555;
  }

  .prose .code-block,
  .prose .callout,
  .prose .theorem,
  .table-wrap,
  .prose blockquote {
    border: 1px solid #bbb !important;
    background: #fff !important;
  }

  .prose .shiki,
  .prose .shiki span {
    background: #fff !important;
    color: #000 !important;
  }

  .prose .code-block pre {
    white-space: pre-wrap;
  }

  .prose .katex {
    color: #000 !important;
  }

  .prose h2,
  .prose h3 {
    page-break-after: avoid;
  }

  .prose figure,
  .prose .fig,
  .prose table {
    page-break-inside: avoid;
  }
}