/* Scoped overlay for 《中文风格要素》. The host stylesheet remains untouched. */
body.book-page { overflow-x: hidden; }
.book-page *, .book-page *::before, .book-page *::after { box-sizing: border-box; }
.book-page main { width: 100%; max-width: 100%; min-width: 0; }
.book-page .article-shell { width: min(100% - 32px, 920px); margin: 0 auto; min-width: 0; }
.book-page .book-breadcrumb { display: flex; flex-wrap: wrap; gap: .55rem; align-items: center; margin: 1.25rem 0 2.2rem; color: #6b6c78; font-size: .88rem; }
.book-page .book-breadcrumb a { color: inherit; }
.book-page .article-header { margin-bottom: 2rem; }
.book-page .article-header h1 { max-width: 18ch; margin: .2rem 0 1rem; line-height: 1.22; overflow-wrap: anywhere; }
.book-page .dek { max-width: 44rem; margin: 0; font-size: 1.13rem; line-height: 1.8; color: #565866; }
.book-page .article-meta { display: flex; flex-wrap: wrap; gap: .65rem 1rem; align-items: center; margin-top: 1.15rem; color: #777986; font-size: .86rem; }
.book-page .book-progress { color: #6c4cff; font-variant-numeric: tabular-nums; }
.book-page .hero { margin: 2.3rem 0 0; border-radius: 18px; overflow: hidden; }
.book-page .hero img { display: block; width: 100%; height: auto; max-width: 100%; }
.book-page .article-body { min-width: 0; font-size: 1.06rem; line-height: 1.95; overflow-wrap: anywhere; }
.book-page .article-body > * { max-width: 100%; }
.book-page .article-body p { margin: 0 0 1.25rem; }
.book-page .article-body h2, .book-page .article-body h3 { scroll-margin-top: 5rem; line-height: 1.4; overflow-wrap: anywhere; }
.book-page .article-body h2 { margin: 2.8rem 0 .9rem; }
.book-page .article-body h3 { margin: 2rem 0 .65rem; font-size: 1.15em; }
.book-page .article-body ul, .book-page .article-body ol { padding-left: 1.45rem; margin: .75rem 0 1.35rem; }
.book-page .article-body li { margin: .35rem 0; }
.book-page blockquote { margin: 1.5rem 0; padding: 1rem 1.2rem; border-left: 3px solid #e2b86b; background: #fbf8f0; color: #30313a; }
.book-page code { overflow-wrap: anywhere; }
.book-page .rewrite-label { display: inline-block; margin-right: .28rem; font-weight: 700; letter-spacing: .02em; }
.book-page .rewrite-before { color: #8b4b4b; }
.book-page .rewrite-after { color: #246b59; }
.book-page .rewrite-note { color: #6c4cff; }
.book-page .related-reading, .book-page .book-index-links, .book-page .book-toc-section { margin-top: 3rem; padding-top: 1.35rem; border-top: 1px solid #e6e1d8; }
.book-page .related-reading h2, .book-page .book-index-links h2, .book-page .book-toc-section h2 { margin-top: 0; }
.book-page .related-reading ul { display: grid; gap: .5rem; padding: 0; list-style: none; }
.book-page .related-reading a { display: block; padding: .65rem .8rem; border: 1px solid #e6e1d8; border-radius: 9px; }
.book-page .index-link-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .85rem; }
.book-page .index-link-grid a, .book-page .book-toc a, .book-page .index-group a { display: block; min-width: 0; padding: .9rem 1rem; border: 1px solid #e6e1d8; border-radius: 10px; text-decoration: none; }
.book-page .index-link-grid a:hover, .book-page .book-toc a:hover, .book-page .index-group a:hover { border-color: #6c4cff; }
.book-page .index-link-grid strong, .book-page .book-toc strong, .book-page .index-group strong { display: block; color: #252632; }
.book-page .index-link-grid span, .book-page .book-toc li > a > span:last-child, .book-page .index-group li > a > span { display: block; margin-top: .3rem; color: #6b6c78; font-size: .9rem; line-height: 1.6; }
.book-page .book-toc-section { display: grid; gap: 1.4rem; }
.book-page .toc-part h3 { margin: .3rem 0 .65rem; }
.book-page .book-toc { display: grid; gap: .65rem; padding: 0; margin: 0; list-style: none; }
.book-page .book-toc li { min-width: 0; }
.book-page .book-toc-label, .book-page .toc-label { color: #6c4cff; font-size: .82rem; }
.book-page .book-toc .toc-label { display: block; margin-bottom: .15rem; }
.book-page .chapter-nav { display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); gap: .8rem; align-items: stretch; margin: 3.2rem 0 1rem; padding-top: 1.3rem; border-top: 1px solid #e6e1d8; }
.book-page .chapter-nav a { display: flex; min-width: 0; flex-direction: column; gap: .22rem; padding: .75rem .85rem; border: 1px solid #e6e1d8; border-radius: 10px; text-decoration: none; overflow-wrap: anywhere; }
.book-page .chapter-nav a:first-child { text-align: left; }
.book-page .chapter-nav a:last-child { text-align: right; }
.book-page .chapter-nav a span { color: #777986; font-size: .78rem; }
.book-page .chapter-nav a b { color: #6c4cff; font-size: 1.15rem; }
.book-page .chapter-nav .nav-index { justify-content: center; align-items: center; white-space: nowrap; text-align: center; }
.book-page .nav-placeholder { min-width: 0; }
.book-page .index-body .index-intro { font-size: 1.15rem; color: #4d4e5a; }
.book-page .index-group { margin-top: 2.7rem; }
.book-page .index-group h2 { margin-bottom: .5rem; }
.book-page .index-group ul { display: grid; gap: .65rem; padding: 0; list-style: none; }
.book-page .compatibility-link { font-size: 1.2rem; font-weight: 700; }
.book-page a:focus-visible { outline: 3px solid #e2b86b; outline-offset: 3px; }
@media (max-width: 720px) {
  .book-page .article-shell { width: min(100% - 24px, 920px); }
  .book-page .book-breadcrumb { margin-bottom: 1.5rem; }
  .book-page .article-header h1 { max-width: none; font-size: clamp(1.9rem, 8vw, 2.7rem); }
  .book-page .dek { font-size: 1rem; }
  .book-page .article-body { font-size: 1rem; line-height: 1.85; }
  .book-page .index-link-grid { grid-template-columns: 1fr; }
  .book-page .chapter-nav { grid-template-columns: 1fr 1fr; }
  .book-page .chapter-nav .nav-index { grid-column: 1 / -1; grid-row: 1; }
  .book-page .chapter-nav a:last-child { text-align: right; }
  .book-page .nav-placeholder { display: none; }
  .book-page .chapter-nav a:first-child { grid-column: 1; grid-row: 2; }
  .book-page .chapter-nav a:last-child { grid-column: 2; grid-row: 2; }
}
@media (max-width: 420px) {
  .book-page .article-shell { width: min(100% - 20px, 920px); }
  .book-page .article-meta { gap: .45rem .7rem; }
  .book-page .chapter-nav { gap: .45rem; }
  .book-page .chapter-nav a { padding: .65rem .55rem; font-size: .9rem; }
}