/* Reading and doing share the available page width. */
:root{--sidebar-width:240px}
.book-content.lesson,body.contents-hidden .book-content.lesson{max-width:1840px;margin:0 auto;padding:0 30px 40px}
.book-content.lab,body.contents-hidden .book-content.lab{max-width:1250px}
.page-outline{display:none!important}
.lesson-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(380px,1fr);gap:36px;align-items:start}
.reading-column{min-width:0}.lesson-prose{font-size:17px;line-height:2.05}.lesson-prose p{text-align:start}
.lesson .section-header{margin-top:18px;margin-bottom:20px}.lesson .section-header h1{margin-bottom:10px}
.lesson .section-tools{margin-bottom:24px}.lesson .page-turn.top{margin-bottom:16px}
.experiment-pane{position:sticky;top:calc(var(--top) + 16px);max-height:calc(100dvh - var(--top) - 30px);overflow:auto;overscroll-behavior:contain;scrollbar-width:thin;border:1px solid #cad4d8;border-top:3px solid #346d87;border-radius:4px;background:#fff;box-shadow:0 4px 20px #1b354b08;min-width:0}
#experiment-root{font:13px/1.7 var(--sans);color:#304855;min-width:0}
.figure-heading{position:relative;padding:14px 18px 4px}.figure-heading .figure-label{font-size:10px;letter-spacing:.12em;color:#667c86;margin:0}
.figure-heading #lab-title{font:600 17px/1.5 var(--sans);margin:4px 65px 8px 0}.open-lab{position:absolute;right:14px;top:14px;font-size:11px}
.step-status{margin:0 14px 8px;padding:5px 8px;background:#f1f5f5;border-left:2px solid #7199a5;color:#506970;font-size:11px;min-height:28px}
.plot-surface{position:relative;background:#fff;border-top:1px solid #e9edef;border-bottom:1px solid #e3e9eb}
#experiment-root canvas{display:block;width:100%;height:310px;touch-action:none;background:#fff;margin:0;outline-offset:-4px}
#experiment-root canvas:focus-visible{outline:3px solid #bb914b}
.plot-toolbar{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:5px 11px;color:#71868e;font-size:10px;background:#fcfdfd}.view-tools{display:flex;gap:4px}.view-tools button{padding:1px 7px;background:#ffffffdf;font-size:11px;box-shadow:0 1px 4px #253b4612}
.math-inline{display:inline-block;max-width:100%;vertical-align:middle;overflow-x:auto;overflow-y:hidden;line-height:1.4}
.live-equation{font:13px/1.85 "Cambria Math",var(--sans);color:#244d68;padding:8px 15px 0;margin:0;overflow-wrap:anywhere;min-height:32px}
#experiment-root .readout{font-size:12px;line-height:1.8;padding:7px 11px;margin:8px 14px 12px;border-left:2px solid #89a9b7;min-height:36px;background:#f1f6f7}
.parameter-heading{display:flex;align-items:center;justify-content:space-between;gap:10px;font-size:11px;padding:0 15px 8px}.figure-actions{display:flex;gap:6px}.figure-actions button{padding:3px 8px;font-size:11px}
#experiment-root .controls{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 16px;padding:12px 15px;background:#f5f7f7;font-size:11px}
.parameter{display:grid;grid-template-columns:minmax(0,1fr) 64px;column-gap:6px;align-items:center;min-width:0}.parameter label{font-size:11px;color:#465d68;overflow-wrap:anywhere}.parameter input[type=number]{width:100%;min-width:0;border:1px solid #cbd5d9;border-radius:2px;padding:3px 4px;font-size:11px;color:#31566a;background:#fff}.parameter input[type=range]{grid-column:1/-1;margin:3px 0 0;height:16px}.parameter select{grid-column:1/-1;width:100%;min-width:0;padding:4px;border:1px solid #cbd5d9;background:white;font:11px var(--sans);margin-top:4px}
.figure-help,.experiment-pane .animation-details{margin:0;padding:8px 15px;border-top:1px solid #e3e9eb;font-size:11px;line-height:1.8}.figure-help summary{color:#486b7b}.figure-help p{margin:8px 0}.figure-help select{font:11px var(--sans);max-width:100%;padding:4px;border:1px solid #b9c8ce}.presets{display:flex;flex-wrap:wrap;gap:5px;margin:12px 0}.presets button{font-size:10px;padding:3px 7px}.return-step{display:block;border-top:1px solid #e1e6e7;padding:9px 16px;font:11px/1.6 var(--sans);background:#fafbfb}
.walkthrough{margin:6px 0 36px}.walkthrough>h2{font-size:22px;margin-top:0}.walkthrough-intro{font-size:14px;color:#68797e;margin:10px 0 20px!important}.intuition-step{position:relative;padding:0 0 22px 23px;border-left:2px solid #e4e9e7}.intuition-step:before{content:"";position:absolute;width:10px;height:10px;border-radius:50%;border:2px solid #9caeaa;left:-6px;top:10px;background:white}.intuition-step h3{font-size:18px;margin:0 0 10px}.intuition-step p{margin:10px 0 15px}.intuition-step.active{border-left-color:#346d87}.intuition-step.active:before{border-color:#346d87;background:#346d87}.step-play{font:12px/1.5 var(--sans);padding:6px 10px;background:#f5f8f8;border-color:#bdcdd2}.step-play[aria-pressed=true]{color:white;background:#346d87;border-color:#346d87}.step-index{font:12px var(--sans);color:#758b90;margin-right:8px}.lesson-prose>h2{border-top:1px solid #e4e4df;padding-top:26px}
.definition-block{background:#fff9e8;border:1px solid #eee1b3;border-left:3px solid #b99b40;padding:13px 19px;margin:28px 0}.definition-block h3{color:#786023;margin:0 0 7px}.definition-block p{margin:9px 0}
.proposition-block{background:#f1f6fa;border:1px solid #cadce7;border-left:3px solid #4b86ab;padding:14px 19px;margin:26px 0 12px}.proposition-block h3{color:#235879;margin:0 0 8px}.proposition-block p{margin:9px 0}.paper-proof{border-left:2px solid #b6cbd7;padding:0 18px;margin:10px 0 30px}.paper-proof summary{font:600 13px/1.8 var(--sans);color:#3c6079;padding:7px 0}.paper-proof p{font-size:16px}.proof-end{text-align:right!important;color:#657c8a}.principle-link{font-size:13px;background:#f7f8f6;padding:10px 14px;border-left:2px solid #b2c1bb}.model-scope{font:12px/1.8 var(--sans);color:#6e777a;margin:0 0 22px}
.lab-layout #experiment-root{margin-top:20px;border:1px solid #cbd6db;border-top:3px solid #346d87}.lab-layout #plot{height:430px}.lab-layout #experiment-root .controls{grid-template-columns:repeat(3,minmax(0,1fr))}.lab-layout .figure-help,.lab-layout .animation-details{padding:12px 18px}.lab-layout .animation-details video{max-width:800px}
@media(min-width:1700px){.book-content.lesson{padding-left:42px;padding-right:42px}.lesson-grid{gap:48px}.lesson-prose{font-size:18px;line-height:2.1}#experiment-root canvas{height:370px}}
@media(min-width:1101px) and (max-width:1300px){:root{--sidebar-width:220px}.book-content.lesson{padding-left:22px;padding-right:22px}.lesson-grid{grid-template-columns:minmax(0,1fr) minmax(360px,1fr);gap:24px}.lesson-prose{font-size:16px}#experiment-root canvas{height:280px}.figure-heading #lab-title{font-size:15px}}
@media(max-width:1100px){.lesson-grid{display:flex;flex-direction:column;gap:30px}.experiment-pane{position:static;order:-1;width:100%;max-height:none;overflow:visible}.reading-column{width:100%}.book-content.lesson{max-width:900px;padding-left:26px;padding-right:26px}.lesson-prose{font-size:17px}.lab-layout #experiment-root .controls{grid-template-columns:repeat(2,minmax(0,1fr))}.return-step{font-size:12px}.figure-heading #lab-title{margin-right:70px}}
@media(max-width:800px){:root{--sidebar-width:290px}.book-content.lesson,body.contents-hidden .book-content.lesson{padding:0 17px 30px}.lesson-grid{gap:25px}.lesson-prose{font-size:16px}.lesson .section-tools{gap:12px}.experiment-pane{max-width:100%}.figure-heading{padding:12px 12px 3px}.figure-heading #lab-title{font-size:15px}.open-lab{right:10px;font-size:10px}.intuition-step{padding-left:17px}.intuition-step h3{font-size:17px}.walkthrough>h2{font-size:20px}.definition-block,.proposition-block{padding:12px 14px}.paper-proof{padding-left:13px}.paper-proof p{font-size:15px}#experiment-root canvas,.lab-layout #plot{height:280px}.live-equation{font-size:12px;padding:8px 11px 0}#experiment-root .controls{padding:10px 11px;gap:8px 12px}.parameter{grid-template-columns:minmax(0,1fr) 58px}.parameter label{font-size:10px}#experiment-root .readout{margin-left:10px;margin-right:10px;font-size:11px}.book-content.lab{padding-left:17px;padding-right:17px}}
@media(max-width:370px){#experiment-root .controls{grid-template-columns:1fr}.parameter{grid-template-columns:1fr 70px}.lab-layout #experiment-root .controls{grid-template-columns:1fr}.figure-heading #lab-title{margin-right:0;margin-top:8px}.open-lab{top:10px}.parameter-heading{flex-wrap:wrap}.lesson .section-header h1{font-size:24px}}
@media print{.lesson-grid{display:block}.experiment-pane,.step-play,.model-scope{display:none}.book-content.lesson,body.contents-hidden .book-content.lesson{padding:0;margin:0;max-width:none}.intuition-step{break-inside:avoid}.definition-block,.proposition-block{background:none;break-inside:avoid}.paper-proof{break-inside:auto}}