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solid var(--line);font-size:11px;align-items:center}.copy-fallback input{min-width:0;flex:1;padding:8px;border:1px solid var(--line)}.skip-link{position:fixed;top:-100px;left:20px;z-index:100;padding:12px;background:#fff;border:2px solid var(--green)}.skip-link:focus{top:10px}.mobile-navigation{display:none}.lesson-loading{min-height:300px;display:grid;place-items:center;color:#68755c;font-family:var(--serif);font-size:22px}.notes-dialog{border:1px solid #d7e0cc;border-radius:10px;padding:0;width:min(860px,calc(100% - 32px));max-height:88dvh;color:var(--ink);background:#fff}.notes-dialog::backdrop{background:#20341450;-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px)}.notes-dialog-header{display:flex;align-items:center;justify-content:space-between;padding:24px 30px;border-bottom:1px solid var(--line);position:sticky;top:0;background:#fff;z-index:1}.notes-dialog-header h2{margin-top:5px}.notes-content{padding:28px 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15px;display:flex;align-items:flex-start;flex-direction:column;color:var(--green-dark)}.nearby-count>span{font-size:11px;color:var(--muted)}.nearby-count>strong{font:38px var(--serif);line-height:1.35;margin:3px 0}.nearby-count>strong.count-unavailable{font-size:21px;padding:6px 0}.nearby-count>.math{font-size:12px}.nearby-limit,.nearby-empty{font-size:11px;color:var(--muted);padding:12px 0;border-top:1px solid var(--line)}.nearby-limit .secondary-button{margin-top:12px;max-width:100%;text-align:left}.nearby-candidates{display:grid;gap:7px;max-height:234px;overflow-y:auto;padding:3px;margin:0 -3px}.nearby-candidate{min-width:0;padding:10px 12px;background:#fff;border:1px solid var(--line);border-radius:5px;text-align:left;display:flex;flex-direction:column;gap:6px}.nearby-candidate>.math{font-size:13px;overflow-x:auto;width:100%}.nearby-candidate>span:not(.math){font-size:10px;color:var(--muted)}.nearby-candidate.is-selected{border-color:#a3be93;background:#f1f7ec;color:var(--green-dark)}.uniqueness-note{font-size:11px;color:var(--muted);margin-top:16px}.nearby-selected{border-top:1px solid var(--line);padding:20px 26px 14px;background:#fcfdfb}.nearby-selected .object-label{margin-bottom:12px}.nearby-selected .object-label>.math{overflow-x:auto}.nearby-change-controls{max-width:650px;margin-bottom:20px}}@layer responsive{@media(max-width:1100px){.evaluation-workbench{grid-template-columns:minmax(0,1fr) minmax(255px,.95fr)}.nearby-layout{grid-template-columns:minmax(0,1fr) minmax(260px,.85fr)}.nearby-controls{padding:22px 18px}.ball-experiment .ball-lesson-layout{grid-template-columns:minmax(0,1fr) 275px}.ball-experiment .ball-controls{padding:22px 18px}.distance-neighborhood{grid-template-columns:minmax(0,1fr) 280px}}@media(max-width:760px){.coefficient-mapping,.coefficient-result{padding:22px 20px}.coefficient-mapping .tape-column{width:64px}.coefficient-result .polynomial-display{font-size:22px;padding-top:10px;flex-wrap:nowrap}.evaluation-workbench,.nearby-layout,.ball-experiment .ball-lesson-layout{grid-template-columns:minmax(0,1fr)}.evaluation-output,.nearby-received,.nearby-selected{padding:18px}.evaluation-workbench .evaluation-controls{grid-row:1;border-bottom:1px solid var(--line);padding:20px}.evaluation-workbench .evaluation-table-wrap{border-right:0;max-height:275px;padding:6px 12px}.evaluation-workbench .evaluation-table th:first-child,.evaluation-workbench .evaluation-table td:first-child{display:table-cell}.evaluation-workbench .evaluation-table th,.evaluation-workbench .evaluation-table td{padding:9px 12px}.aligned-words .tape,.aligned-comparisons{gap:7px}.aligned-words .tape-column,.aligned-comparisons span{width:38px}.aligned-words .tape-cell{height:39px}.aligned-word-row{grid-template-columns:66px auto;gap:8px}.distance-comparison{padding:20px 16px 16px}.distance-caption{padding:0 20px 20px}.distance-neighborhood{grid-template-columns:minmax(0,1fr)}.distance-radius-control{padding:4px 20px 0}.distance-mini-ball{border:0;padding:8px 16px 16px}.distance-mini-ball .ball-square{max-width:260px}.ball-experiment .ball-visual-column{padding:12px;border-right:0}.ball-experiment .ball-controls{border-top:1px solid var(--line);padding:20px}.ball-experiment .ball-formula{display:none}.nearby-visual{padding:12px;border-right:0}.nearby-controls{border-top:1px solid var(--line);padding:22px 20px}.ball-coordinate{max-width:calc(100% - 78px);font-size:7px;letter-spacing:.3px}.ball-stage .ball-point .point-label{display:block}.ball-stage .ball-square{min-height:0}.panel-topline>.small{font-size:10px}}@media(prefers-reduced-motion:reduce){.evaluation-output .tape-column{animation:none}}}@layer components{.tape-with-points .tape-index{white-space:nowrap}.tape-with-points .tape-column{width:60px}.tape-with-points .tape-index .math{font-size:11px}.ball-point.is-selected{z-index:4}}@layer responsive{@media(max-width:760px){.tape-with-points .tape-column{width:53px}.tape-with-points .tape-index .math{font-size:10px}.coefficient-result .polynomial-display{display:block;overflow:visible}.coefficient-result .polynomial-display>.math{margin-bottom:5px}.coefficient-result .polynomial-terms{flex-wrap:wrap}.parameter-strip .parameter-polynomial{flex-wrap:wrap;overflow:visible}.parameter-strip .parameter-polynomial>.math{width:100%;max-width:100%;overflow-x:auto;font-size:15px;padding:4px 0}}@media(hover:none){.ball-context-labels .ball-point:hover:not(.is-selected,.is-emphasis,.at-center,:focus-visible) .point-label{visibility:hidden}}}@layer components{.list-explainer{border:1px solid var(--line);border-radius:7px;padding:22px 26px}.list-explainer-heading{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:14px;margin-bottom:18px}.list-explainer-heading h2{font-size:25px}.list-explainer-topics{display:flex;gap:4px;flex-wrap:wrap}.list-explainer-topics button{border:1px solid transparent;background:transparent;color:var(--muted);padding:6px 11px;border-radius:5px;font-size:11px}.list-explainer-topics button[aria-pressed=true]{color:var(--green-dark);background:var(--green-soft);border-color:#d7e6d2}.list-explainer-content>p{font-size:12px;line-height:1.8;color:var(--ink);max-width:840px}.list-explainer-content>.list-explainer-detail{font-size:11px;color:var(--muted)}.list-definition-flow{display:grid;grid-template-columns:minmax(0,.7fr) 24px minmax(0,1fr) 24px minmax(0,1fr);gap:14px;align-items:center;margin:20px 0}.list-definition-flow>div{display:flex;flex-direction:column;align-items:center;gap:6px;padding:12px 8px;border:1px solid var(--line);border-radius:5px;background:var(--paper);text-align:center}.list-definition-flow>div:last-child{background:var(--green-soft);border-color:#d7e6d2}.list-definition-flow>div>.math{font-size:20px;color:var(--green-dark)}.list-definition-flow>div>span:not(.math),.list-definition-flow small{font-size:10px;color:var(--muted)}.list-definition-flow>svg,.list-stark-connection>svg{color:#8a9f7f}.list-example-choices{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:18px 0;max-width:650px}.list-example-choices button{display:flex;flex-direction:column;align-items:flex-start;gap:8px;padding:13px 18px;background:var(--paper);border:1px solid #cbdcbe;border-radius:5px;text-align:left;color:var(--green-dark)}.list-example-choices button:hover{background:var(--green-soft);border-color:#81a66b}.list-example-choices button>span:not(.math){font-size:11px}.list-example-choices button>.math{font-size:20px}.list-example-choices small{font-size:10px;color:var(--muted)}.list-stark-connection{display:grid;grid-template-columns:minmax(0,1fr) 24px minmax(0,1fr);align-items:center;gap:18px;border-left:2px solid #a1bf90;padding:15px 18px;margin:18px 0;background:var(--paper);max-width:760px}.list-stark-connection>div{display:flex;flex-direction:column;align-items:flex-start;gap:6px;color:var(--green-dark)}.list-stark-connection>div>span:not(.math){color:var(--muted);font-size:11px}.list-stark-connection .math{font-size:20px}.list-stark-connection strong{font-size:13px;font-weight:500}.list-result-explanation{font-size:11px;line-height:1.7;color:var(--muted);margin:0 0 13px}}@layer responsive{@media(max-width:760px){.list-explainer{padding:20px}.list-explainer-heading{gap:12px}.list-explainer-topics{margin-left:-5px}.list-explainer-topics button{padding:7px 9px}.list-definition-flow{grid-template-columns:minmax(0,1fr);gap:8px}.list-definition-flow>svg{transform:rotate(90deg);justify-self:center}.list-definition-flow>div{padding:10px}.list-example-choices{grid-template-columns:minmax(0,1fr)}.list-stark-connection{grid-template-columns:minmax(0,1fr);gap:12px;padding:14px}.list-stark-connection>svg{transform:rotate(90deg)}}}@layer components{.further-reading{margin-top:44px;padding-top:28px;border-top:1px solid var(--line);scroll-margin-top:24px}.further-reading-intro{margin-top:8px;color:var(--muted);font-size:12px;line-height:1.7}.reading-list{list-style:none;margin:24px 0 0;padding:0}.reading-list li{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:12px 24px;padding:20px 0;border-top:1px solid var(--line)}.reading-list h3{font-size:18px;line-height:1.4}.reading-authors{margin-top:6px;color:var(--muted);font-size:11px;line-height:1.6}.reading-description{margin-top:8px;max-width:78ch;font-size:12px;line-height:1.7}.reading-links{display:flex;flex-direction:column;align-items:flex-start;gap:10px;padding-top:3px;color:var(--green-dark);font-size:11px;white-space:nowrap}.reading-links a{display:inline-flex;align-items:center;gap:4px;text-decoration:underline;text-underline-offset:3px}.reading-links a:hover{color:var(--green)}}@layer responsive{@media(max-width:600px){.reading-list li{grid-template-columns:minmax(0,1fr)}.reading-links{flex-direction:row;flex-wrap:wrap;gap:16px}}}