.chapter-card+.chapter-card{margin-top:12px}.tag-row{display:flex;flex-wrap:wrap;gap:7px;margin-top:14px}.tag-row span{padding:3px 8px;border:1px solid var(--line);border-radius:999px;color:var(--muted);font-size:10px}.route{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin:24px 0}.route span{padding:7px 11px;border:1px solid var(--line);background:var(--surface)}.route b{color:var(--accent)}
.compare,.concept-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:22px}.compare>div,.concept-grid article{padding:20px;border:1px solid var(--line);background:var(--surface)}.compare small,.concept-grid article>span{display:block;margin-bottom:8px;color:var(--accent);font:10px ui-monospace,monospace;letter-spacing:.1em}.compare b{display:block;font-family:Georgia,"Noto Serif SC",serif;font-size:19px}.compare p,.concept-grid p{margin-bottom:0;color:var(--muted);font-size:14px}.concept-grid{grid-template-columns:repeat(2,1fr)}.concept-grid h3{margin:0;font:20px Georgia,"Noto Serif SC",serif}
.source-figure{max-width:850px;margin:26px 0}.source-figure img{display:block;width:100%;max-height:720px;object-fit:contain;border:1px solid var(--line);background:#fff}.source-figure figcaption{padding:8px 2px;color:var(--muted);font-size:11px}.source-figure.portrait img{max-width:620px}.compact-figure img{max-height:580px}.reaction-list{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;max-width:850px}.reaction-list p{display:flex;justify-content:space-between;gap:20px;margin:0;padding:13px 15px;border-bottom:1px solid var(--line);background:var(--surface)}.reaction-list span{color:var(--muted);text-align:right}
.example-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;max-width:900px}.example-grid article{padding:16px 18px;border:1px solid var(--line);background:var(--surface)}.example-grid b{color:var(--accent);font-family:Georgia,"Noto Serif SC",serif}.example-grid p{margin:7px 0 0;color:var(--muted);font-size:14px}.study-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;max-width:900px;margin:22px 0}.study-strip span{padding:15px 12px;border-top:2px solid var(--accent);background:var(--surface);color:var(--muted);font-size:13px}.study-strip b{display:block;margin-bottom:4px;color:var(--text)}
.steps{max-width:850px;padding:0;counter-reset:step;list-style:none}.steps li{position:relative;padding:0 0 22px 54px;counter-increment:step}.steps li:before{content:counter(step);position:absolute;left:0;top:0;display:grid;place-items:center;width:34px;height:34px;border:1px solid var(--accent);color:var(--accent);font-family:Georgia}.steps p{margin:4px 0;color:var(--muted)}.tool-table,.data-table{max-width:900px;border:1px solid var(--line);background:var(--surface)}.tool-table>div{display:grid;grid-template-columns:180px 1fr;gap:20px;padding:11px 15px;border-bottom:1px solid var(--line)}.tool-table>div:last-child,.data-table>div:last-child{border-bottom:0}.tool-table span,.data-table span{color:var(--muted)}.data-table>div{display:grid;grid-template-columns:1fr 1fr 2fr;gap:16px;padding:11px 15px;border-bottom:1px solid var(--line)}.data-table .head{color:var(--accent);font-size:12px}
.equation{display:flex;flex-direction:column;gap:5px;max-width:850px;margin:20px 0;padding:18px 20px;border-left:3px solid var(--accent);background:var(--surface);font-family:Georgia,"Times New Roman","Noto Serif SC",serif;font-size:20px}.equation small{color:var(--muted);font:12px/1.6 Inter,"Noto Sans SC",sans-serif}.frac{display:inline-flex;vertical-align:middle;flex-direction:column;align-items:stretch;text-align:center;margin:0 .15em}.frac>b{padding:0 .15em;border-bottom:1px solid currentColor;font-weight:400}.frac>i{padding:0 .15em}.worked{max-width:850px;margin:16px 0;padding:18px 20px;border:1px solid var(--line);background:var(--surface)}.worked h3{margin-top:0}.worked .equation{margin-bottom:0;background:var(--surface-2)}
details{max-width:850px;margin:8px 0;border:1px solid var(--line);background:var(--surface)}summary{padding:13px 16px;color:var(--accent);cursor:pointer}details>p{padding:0 16px;color:var(--muted)}details>.equation{margin:0 16px 16px}.trend-table{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;max-width:900px}.trend-table>div{padding:18px;border:1px solid var(--line);background:var(--surface)}.trend-table b,.trend-table span{display:block}.trend-table span{margin:3px 0;color:var(--accent)}.trend-table p{margin:8px 0 0;color:var(--muted);font-size:14px}.checklist{max-width:850px;padding-left:1.3em}.checklist li{padding:6px 0;color:#cbd1cd}.article i{font-family:Georgia,"Times New Roman",serif}.light .article section>p,.light .checklist li{color:var(--text)}
@media(max-width:820px){.compare{grid-template-columns:1fr}.concept-grid,.trend-table,.example-grid{grid-template-columns:1fr}.study-strip{grid-template-columns:repeat(2,1fr)}.source-figure img{max-height:none}}@media(max-width:560px){.chapter-card{grid-template-columns:52px 1fr;padding:20px;gap:14px}.chapter-no{width:48px;height:48px;font-size:19px}.chapter-card>b{display:none}.chapter-card h2{font-size:21px}.reaction-list{grid-template-columns:1fr}.study-strip{grid-template-columns:1fr}.tool-table>div,.data-table>div{grid-template-columns:1fr;gap:4px}.data-table .head{display:none}.equation{font-size:17px;overflow-wrap:anywhere}}