/* Shared reading hierarchy. Content-specific diagrams keep their own geometry. */
:root {
  --copy-quiet: #b5c0ad;
  --rule-soft: #c8dac21f;
}
.section-heading h2 { font-weight: 550; letter-spacing: -.025em; }
.section-heading h2 .i18n { gap: 5px; }
html[data-language="both"] .section-heading h2 .i18n > [data-lang="zh"] { font-size: 18px; color: var(--copy-quiet); }
.knowledge-card { border-color: var(--rule-soft); box-shadow: none; }
.knowledge-card .card-link { height: 100%; }
.knowledge-card .card-copy { flex: 1; display: flex; flex-direction: column; }
.knowledge-card .card-copy h3 { font-size: 23px; line-height: 1.45; margin-bottom: 16px; }
.knowledge-card .card-copy p { font-size: 17px; line-height: 1.8; color: #c6d0bf; margin-bottom: 24px; }
.knowledge-card .card-category { font: 14px/1.6 var(--font); letter-spacing: .025em; margin-bottom: 12px; }
.knowledge-card .card-meta { margin-top: auto; padding-top: 16px; border-color: var(--rule-soft); color: var(--copy-quiet); font-size: 15px; }
.knowledge-card .card-meta > span { font-size: 15px; }
.knowledge-card .card-connection { border-left: 2px solid #809a71; padding-left: 14px; font-size: 16px; }
.card-visual { border-color: var(--rule-soft); }
.card-photo { object-fit: cover; }
.home-editorial .featured-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.home-editorial .featured-section { padding-top: 64px; }
.home-editorial .hero-description { max-width: 440px; }
.home-editorial .home-routes { padding-top: 72px; }
.reading-routes { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 32px; }
.reading-routes > a { display: block; padding-block: 22px; border-top: 1px solid #74826b; }
.reading-routes .route-symbol { color: var(--lime); font-size: 32px; line-height: 1; }
.reading-routes h3 { font-size: 22px; font-weight: 550; line-height: 1.5; margin: 20px 0 14px; }
.reading-routes p { font-size: 17px; line-height: 1.8; color: var(--copy-quiet); margin: 0; }
.reading-routes a:hover h3 { color: var(--lime); }
.reading-routes a:focus-visible { outline: 2px solid var(--lime); outline-offset: 6px; }
.recent-section { padding-top: 72px; }
.recent-notes > a { display: grid; grid-template-columns: 132px minmax(0,1fr); gap: 28px; padding-block: 24px; border-top: 1px solid var(--rule-soft); }
.recent-notes time { font: 15px/1.8 var(--mono); color: var(--copy-quiet); padding-top: 4px; }
.recent-notes h3 { font-size: 22px; line-height: 1.5; margin: 0 0 12px; font-weight: 550; }
.recent-notes p { color: var(--copy-quiet); font-size: 17px; line-height: 1.8; margin: 0; max-width: 760px; }
.recent-notes a:hover h3 { color: var(--lime); }
.home-signoff { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: 20px; padding-block: 56px; margin-top: 28px; border-top: 1px solid var(--rule-soft); }
.home-signoff p { color: var(--copy-quiet); font-size: 18px; }
.home-signoff a { color: var(--lime); text-decoration: underline; text-underline-offset: 5px; }
.series-guide { padding-block: 4px 48px; }
.series-guide dl { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 28px; margin: 0 0 32px; }
.series-guide dl > div { border-top: 1px solid #75806b; padding-top: 18px; }
.series-guide dt { color: var(--lime); font-size: 16px; line-height: 1.5; margin-bottom: 16px; }
.series-guide dd { margin: 0; font-size: 18px; line-height: 1.8; }
.series-paths { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 24px; }
.series-path { background: #182117; padding: 24px; border-radius: 8px; }
.series-path h2 { font-size: 21px; line-height: 1.5; margin: 0 0 14px; }
.series-path p { color: var(--copy-quiet); font-size: 17px; line-height: 1.8; }
.series-path ol { display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 24px 0 0; list-style: none; }
.series-path a { display: inline-flex; align-items: center; min-height: 44px; padding: 8px 14px; border: 1px solid #667859; border-radius: 6px; color: var(--lime); font-size: 16px; }
.series-episodes > li { scroll-margin-top: 32px; border-width: 1px 0 0; border-radius: 0; padding: 28px 0; }
.about-grid { grid-template-columns: minmax(160px,260px) minmax(0,1fr); align-items: start; gap: 56px; }
.about-page .page-heading h1 { text-wrap: balance; }
.about-mark { min-height: 0; aspect-ratio: 1; font-size: 140px; }
.about-reading { padding-left: 22px; margin-block: 28px; }
.about-reading li { margin-block: 16px; }
.about-reading a,.article-author { text-decoration: underline; text-decoration-color: #9ba88b66; text-underline-offset: 5px; }
.article-author:hover { color: var(--lime); }
.article-heading h1 { text-wrap: balance; }
.article-technical .article-heading { max-width: 1000px; }
.article-technical #article-content :is(figure, .equation, .interactive-lab) { scroll-margin-top: 32px; }
.article-travel .article-heading { max-width: 860px; margin-inline: auto; }
.article-travel .article-heading > .overline,.article-travel .article-tags { display: none; }
.article-travel .article-heading h1 { font-family: var(--serif, Georgia), 'Noto Serif CJK SC', 'Songti SC', serif; font-weight: 500; line-height: 1.4; }
.article-travel .reading-layout { grid-template-columns: minmax(0,1fr); max-width: 960px; margin-inline: auto; padding-top: 24px; }
.article-travel .article-toc { position: static; max-height: none; border: 0; border-bottom: 1px solid var(--rule-soft); border-radius: 0; padding: 0 0 18px; }
.article-travel .article-toc nav { display: flex; flex-direction: row; flex-wrap: wrap; gap: 8px 24px; }
.article-travel .article-toc nav > a { padding: 8px 0; max-width: 100%; font-size: 16px; border-left: 0; }
.article-travel .article-toc nav > a.active { background: transparent; text-decoration: underline; text-underline-offset: 6px; }
.article-travel .article-toc nav > a > span:first-child,.article-travel .toc-bottom { display: none; }
.article-travel #article-content .travelogue { max-width: 860px; }
.article-travel #article-content .travelogue > p { font-family: 'Noto Serif CJK SC','Source Han Serif SC','Songti SC',Georgia,serif; font-size: 19px; line-height: 2; letter-spacing: .012em; margin-block: 0 28px; }
.article-travel #article-content .travelogue h2 { font-size: 29px; font-weight: 500; margin-block: 56px 24px; }
.article-travel #article-content .travel-photo img { border-radius: 3px; }
.article-travel #article-content .travel-photo figcaption { font-size: 16px; color: var(--copy-quiet); }
.article-travel .article-toc details:not([open]) summary { margin: 0; }
@media (max-width: 1000px) {
 .reading-routes,.series-paths,.series-guide dl { gap: 22px; }
 .home-editorial .featured-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
 .home-editorial .featured-grid > .knowledge-card:last-child { grid-column: 1/-1; }
 .home-editorial .featured-grid > .knowledge-card:last-child .card-link { display: grid; grid-template-columns: 1fr 1fr; }
 .home-editorial .featured-grid > .knowledge-card:last-child .card-visual { height: 100%; min-height: 220px; }
}
@media (max-width: 700px) {
 .about-page .page-heading h1 { font-size: 30px; }
 .about-grid { grid-template-columns: minmax(0,1fr); }
 .about-mark { display: none; }
 .reading-routes,.series-guide dl,.series-paths { grid-template-columns: 1fr; }
 .reading-routes { gap: 18px; }
 .reading-routes > a { padding-block: 20px; }
 .reading-routes h3 { margin-top: 12px; }
 .recent-notes > a { grid-template-columns: 1fr; gap: 12px; }
 .recent-notes h3 { font-size: 21px; }
 .home-editorial .home-routes,.recent-section { padding-top: 48px; }
 .article-travel .article-toc nav { display: grid; grid-template-columns: minmax(0,1fr); gap: 4px; }
 .article-travel #article-content .travelogue > p { font-size: 18px; line-height: 1.95; }
 .article-travel #article-content .travelogue h2 { font-size: 25px; margin-top: 44px; }
}
@media (max-width: 560px) {
 .home-editorial .featured-grid { grid-template-columns: minmax(0,1fr); }
 .home-editorial .featured-grid > .knowledge-card:last-child .card-link { display: flex; }
 .home-editorial .featured-grid > .knowledge-card:last-child .card-visual { min-height: 0; height: 190px; }
 .home-editorial .card-visual { height: 190px; }
 .knowledge-card .card-copy h3 { font-size: 22px; }
}
@media print {
 .article-travel .article-toc { display: none; }
 .home-signoff,.series-paths { break-inside: avoid; }
}