.book-shell{max-width:1500px;margin:auto;display:grid;grid-template-columns:245px minmax(0,1fr)}.book-nav{position:sticky;top:0;height:100dvh;padding:26px 17px;border-right:1px solid var(--line);overflow-y:auto;background:var(--panel)}.book-brand{font:600 26px var(--mono);letter-spacing:2px;color:var(--accent);display:block;padding:0 10px 20px}.book-nav>a:not(.book-brand){display:block;padding:9px 11px;font-size:14px;color:var(--muted)}.book-nav details{margin:14px 0}.book-nav summary{font-size:13px;cursor:pointer;color:var(--muted);padding:7px}.book-nav details a{display:block;font-size:12px;padding:7px 9px;border-left:2px solid transparent;line-height:1.6;color:var(--muted)}.book-nav a.current{color:var(--accent);border-color:var(--accent);background:var(--panel2)}.book-main{min-width:0}.reader-top{padding:0 30px;gap:12px}.reader-top .breadcrumb{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.reader-actions{display:flex;gap:8px;align-items:center}.reader-home{display:none}.reading-layout{display:grid;grid-template-columns:minmax(0,760px) 180px;gap:32px;padding:36px 40px;max-width:1130px;margin:auto}.article{min-width:0;overflow-wrap:anywhere}.article h1{font-size:clamp(27px,3vw,40px);line-height:1.5;margin:12px 0 19px}.article h2{font-size:23px;line-height:1.6;margin:36px 0 15px;scroll-margin-top:105px}.article h3{font-size:19px;margin-top:27px}.article p,.article li{font-size:17px;line-height:2;color:var(--muted);margin:15px 0}.article strong{color:var(--text);font-weight:600}.article a:not(.button){color:var(--accent);text-decoration:underline;text-decoration-color:var(--line-strong);text-underline-offset:4px}.article ul,.article ol{padding-left:25px}.article .meta{font:12px/1.9 var(--mono);color:var(--dim);letter-spacing:1px}.article .intro{font-size:18px;color:var(--text);line-height:1.9}.prereqs{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0 23px}.prereqs a{font-size:13px;padding:5px 10px;border:1px solid var(--line-strong);border-radius:4px;text-decoration:none!important}.reading-tools{display:flex;flex-wrap:wrap;gap:9px;align-items:center;padding:15px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin-bottom:23px;font-size:13px;color:var(--muted)}select{background:var(--panel);color:var(--text);border:1px solid var(--line-strong);border-radius:4px;font:inherit;padding:8px;max-width:100%}.reading-tools button{font-size:13px;padding:9px 13px;background:var(--panel2);border:1px solid var(--line-strong);border-radius:4px}.reading-tools label{display:flex;gap:8px;align-items:center}.book-toc{position:sticky;top:101px;align-self:start;max-height:calc(100dvh - 125px);overflow:auto}.book-toc p{font-size:12px;color:var(--dim);letter-spacing:1px}.book-toc a{display:block;font-size:12px;color:var(--muted);padding:7px 0;border-left:1px solid var(--line);padding-left:12px;line-height:1.7}.book-toc a:hover{color:var(--accent)}.math-display{margin:23px 0;padding:17px 16px;background:var(--panel2);border:1px solid var(--line);border-radius:5px;overflow-x:auto;overflow-y:hidden;max-width:100%}.katex-display{margin:.35em 0!important}.katex{font-size:1.08em!important}.article details{border:1px solid var(--line-strong);border-radius:5px;margin:14px 0;padding:14px 18px;background:var(--panel)}.article summary{cursor:pointer;color:var(--text);font-size:16px;line-height:1.9}.article details p{font-size:16px}.chapter-lab{border-left:3px solid var(--accent);padding:18px 21px;background:var(--panel2);margin:30px 0}.chapter-lab p{font-size:15px;margin:8px 0 14px}.study-state{padding:22px 0;border-top:1px solid var(--line-strong);margin-top:30px}.study-state h2{margin-top:10px}.study-state textarea{width:100%;resize:vertical;min-height:150px;max-height:600px;background:var(--panel);color:var(--text);border:1px solid var(--line-strong);border-radius:5px;padding:14px;font:16px/1.9 var(--sans)}.study-state label{font-size:16px}.study-state input[type=checkbox]{width:18px;height:18px;accent-color:var(--accent);vertical-align:middle;margin-right:9px}.save-row{display:flex;align-items:center;flex-wrap:wrap;gap:13px;margin-top:13px}.save-row small{color:var(--muted);font-size:12px}.chapter-nav{display:flex;justify-content:space-between;gap:16px;margin:30px 0;border-top:1px solid var(--line);padding-top:20px}.chapter-nav a{font-size:14px;max-width:48%}.article .references li{font-size:14px;line-height:1.9}.article .references small{display:block;color:var(--dim)}.study-status{font-size:12px!important;color:var(--dim)!important}.catalog-content{padding:35px 40px;max-width:1050px;margin:auto}.catalog-content h1{font-size:34px}.catalog-content>p{color:var(--muted)}.catalog-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:20px 0}.catalog-card{padding:20px;background:var(--panel);border:1px solid var(--line);border-radius:6px;min-width:0}.catalog-card:hover{border-color:var(--accent)}.catalog-card small{font:12px var(--mono);color:var(--accent)}.catalog-card h3{font-size:17px;font-weight:500;margin:9px 0}.catalog-card p{font-size:14px;color:var(--muted);line-height:1.8;margin:0}.catalog-group{scroll-margin-top:100px}.catalog-group h2{margin-top:33px}.storage-actions{display:flex;gap:10px;flex-wrap:wrap;margin:20px 0}.storage-actions button,.import-label{font-size:14px;padding:10px 16px;border:1px solid var(--line-strong);background:var(--panel);color:var(--text);border-radius:4px;cursor:pointer}.storage-actions input{width:100%;font-size:14px}.progress-track{height:5px;background:var(--line);border-radius:5px;overflow:hidden}.progress-fill{height:100%;background:var(--accent);width:0}.search-hit{display:block;font-size:12px;color:var(--muted);line-height:1.8;margin-top:5px}.search-result{display:block;width:100%}.search-result small{display:block;margin-top:3px}.lab-layout{display:grid;grid-template-columns:245px minmax(0,1fr);gap:24px;margin:23px 0}.lab-controls{background:var(--panel);border:1px solid var(--line);border-radius:6px;padding:18px}.lab-control{display:block;font-size:14px;margin-bottom:19px;color:var(--muted)}.lab-control output{display:block;font:15px/1.8 var(--mono);color:var(--accent);margin:5px 0}.lab-control input{width:100%;min-height:30px;accent-color:var(--accent)}.lab-control select{width:100%;margin-top:8px}.plot-wrap{min-width:0}.lab-plot{width:100%;height:340px;display:block;background:var(--panel);border:1px solid var(--line);border-radius:6px}.lab-readout{font:14px/1.9 var(--mono);color:var(--accent);white-space:pre-line;min-height:55px;margin:14px 0}.lab-legend{font-size:13px;color:var(--muted);line-height:1.8}.lab-explanation{font-size:16px;line-height:2;color:var(--muted)}.lab-download{margin:15px 0;background:var(--panel2);border:1px solid var(--line-strong);color:var(--text);padding:9px 13px;border-radius:4px}.book-mobile-nav{display:none}.print-only{display:none}.extension-note{border:1px solid var(--line);padding:18px;border-radius:5px;color:var(--muted);font-size:14px;line-height:1.9}
.sidebar{overflow-y:auto}.brand{gap:9px;padding:0 4px}.brand svg{width:28px;flex-shrink:0}.brand small{font-size:9px;letter-spacing:1px;line-height:1.8}.side-nav>a:not(:has(svg)){border-top:1px solid var(--line);font-size:13px;padding-top:13px}.lab-readout{display:block}
@media(max-width:1200px){.reading-layout{grid-template-columns:minmax(0,1fr);max-width:850px;padding:30px}.book-toc{display:none}.book-shell{grid-template-columns:210px minmax(0,1fr)}.lab-layout{grid-template-columns:200px minmax(0,1fr)}}
@media(max-width:900px){.book-shell{display:block}.book-nav{display:none}.reader-home{display:block;color:var(--accent);font:600 22px var(--mono)}.reader-top{padding:0 22px}.book-mobile-nav{display:flex;position:sticky;top:77px;z-index:9;background:var(--topbar);border-bottom:1px solid var(--line);justify-content:space-around;padding:6px 10px;backdrop-filter:blur(14px)}.book-mobile-nav a{font-size:13px;padding:9px;color:var(--muted)}.article h2{scroll-margin-top:143px}.catalog-group{scroll-margin-top:143px}.reading-layout{padding-top:25px}.reader-top .breadcrumb{max-width:40%;font-size:12px}.reader-top .search-button{min-width:0;width:40px;font-size:0;justify-content:center}.reader-top .search-button kbd{display:none}}
@media(max-width:640px){.reader-top{height:65px;padding:0 17px}.book-mobile-nav{top:65px}.reading-layout{padding:24px 19px}.article h1{font-size:29px}.article p,.article li{font-size:16px;line-height:2}.article h2{font-size:22px;scroll-margin-top:132px}.prereqs a{font-size:13px;min-height:39px;display:flex;align-items:center}.math-display{padding:13px 10px}.reading-tools{gap:8px}.reading-tools button{min-height:44px}.article details{padding:13px 15px}.chapter-nav{flex-direction:column}.chapter-nav a{max-width:100%}.catalog-content{padding:25px 19px}.catalog-content h1{font-size:29px}.catalog-grid{grid-template-columns:1fr}.lab-layout{grid-template-columns:1fr;gap:13px}.lab-controls{display:grid;grid-template-columns:1fr 1fr;gap:10px 20px}.lab-control{margin-bottom:7px;font-size:13px}.lab-plot{height:300px}.lab-readout{font-size:12px}.save-row .button{min-height:44px}.reader-actions{gap:7px}.reader-top .breadcrumb{max-width:35%}.reader-top .theme-toggle{width:40px;height:40px}.book-mobile-nav a{font-size:12px}.catalog-group{scroll-margin-top:132px}.article .intro{font-size:17px}.study-state textarea{font-size:16px}}
@media print{body,html[data-theme]{background:white!important;color:black!important}.book-nav,.book-toc,.topbar,.book-mobile-nav,.study-state,.reading-tools,.chapter-nav,dialog,.storage-actions,.lab-controls,.lab-download{display:none!important}.book-shell,.reading-layout{display:block}.reading-layout{padding:0;max-width:none}.article p,.article li,.article h1,.article h2,.article strong{color:black!important}.article details{display:block;background:white}.article details::details-content{content-visibility:visible!important;display:block!important}.article details p{display:block!important}.math-display{background:white;color:black;border:1px solid #ccc;overflow:visible}.article a{color:black!important}.print-only{display:block}.article h2{break-after:avoid}.math-display,details{break-inside:avoid}}