@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Manrope:wght@500;600;700;800&display=swap');
:root{color-scheme:dark;--bg:#0b1219;--panel:#111d28;--line:#293b4a;--muted:#9cafbd;--text:#e1ebef;--accent:#7adcca;--gold:#ffd48a}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:14px 'DM Sans',system-ui,sans-serif}button,select,input{font:inherit}button,select{border:1px solid var(--line);color:var(--text);background:#172633;border-radius:7px;padding:8px 11px}button{cursor:pointer}button:hover{background:#253d4c;border-color:#5b7d8c}button.active{color:var(--accent);border-color:#5bbaaa;background:#163634}button:focus-visible,select:focus-visible,input:focus-visible{outline:2px solid var(--gold);outline-offset:3px}input[type=range]{accent-color:var(--accent);cursor:pointer;min-width:80px}input[type=checkbox]{accent-color:var(--accent)}[hidden]{display:none!important}a{color:var(--accent)}header{height:74px;padding:0 28px;display:flex;align-items:center;gap:24px;border-bottom:1px solid var(--line);background:#101a23}.brand{display:flex;align-items:center;gap:13px;margin-right:auto}.brand b{font:800 25px Manrope,sans-serif;color:var(--accent)}.brand span{max-width:95px;font-size:9px;letter-spacing:1.6px;line-height:1.6;color:var(--muted)}nav{display:flex;gap:5px}nav button{border:0;background:transparent;padding:12px 16px}nav button.active{box-shadow:inset 0 -2px var(--accent);background:#132c30;border-radius:5px 5px 0 0}main{max-width:1640px;margin:auto;padding:16px 24px 32px}h1,h2,h3{font-family:Manrope,sans-serif;margin:0 0 10px;line-height:1.3}h1{font-size:30px}h2{font-size:21px}h3{font-size:15px}p{line-height:1.6;margin:10px 0}#originbar{display:flex;align-items:center;gap:14px;margin:0 0 14px}#originbar label{font-weight:700}#originbar select{min-width:280px}#originbar span{margin-left:auto;color:var(--muted);font-size:12px}.workspace{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:18px;align-items:start}.panel{background:var(--panel);border:1px solid var(--line);border-radius:12px;overflow:hidden}.viewbar{padding:10px 12px;display:flex;gap:5px;align-items:center;flex-wrap:wrap}.viewbar button{font-size:12px;padding:7px 10px}.viewbar #viewName{font-weight:600;color:var(--muted);margin-right:auto;min-width:100px;font-size:12px}#stage{height:440px;position:relative;background:radial-gradient(ellipse at 50% 45%,#243440 0,#14232e 48%,#0e1922 90%);overflow:hidden}#stage canvas{display:block;touch-action:none}.stageHint{position:absolute;bottom:12px;left:14px;color:#8195a5;font-size:11px;pointer-events:none}#cutBadge{position:absolute;top:14px;left:14px;padding:7px 10px;background:#503c37;color:#ffceb8;font-size:10px;letter-spacing:1px;border-radius:5px;pointer-events:none}#loading{position:absolute;top:45%;width:100%;text-align:center}#labelLines,#labels{position:absolute;inset:0;pointer-events:none;width:100%;height:100%}.label{position:absolute;transform:translate(-50%,-50%);font-size:11px;background:#0e1d29df;padding:4px 7px;border-radius:4px;white-space:nowrap;border:1px solid #51627080}.label.focus{color:var(--gold);border-color:#91784d}.orientation{position:absolute;top:15px;left:14px;right:14px;display:flex;justify-content:space-between;font-size:11px;color:#879aa9;pointer-events:none}.cutpanel{background:#1a2934;padding:12px 16px;border-top:1px solid #344b59;border-bottom:1px solid #344b59}.cuthead,.cutrow,.cutfooter{display:flex;align-items:center;gap:12px}.cuthead label{font-weight:700}.cuthead output{font-weight:400;font-size:12px;color:var(--gold);margin-left:10px}.cuthead button{margin-left:auto;font-size:11px;padding:5px 9px}.cutrow{margin:7px 0}.cutrow input{width:100%}.cutrow button{padding:2px 11px;font-size:18px}.cutfooter{justify-content:space-between;font-size:11px;color:var(--muted)}.cutfooter label{white-space:nowrap}.leadDock{padding:12px 14px 4px}.docktitle{display:flex;gap:12px;align-items:center;margin-bottom:8px}.docktitle b{font-size:12px}.docktitle span{color:var(--muted);font-size:11px}#ecg{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:5px}.ecglead{padding:5px 3px;min-width:0;text-align:center}.ecglead>span:first-child{font-size:12px;font-weight:700}.ecglead .polarity{display:none}.ecglead svg{display:block;width:100%;height:27px}.selectedLead{display:flex;align-items:center;min-height:37px;gap:12px}#leadNote{color:var(--muted);font-size:11px;flex:1}#selectedTrace{width:90px;height:34px}.toolbar{padding:9px 14px;display:flex;gap:13px;align-items:center;flex-wrap:wrap;font-size:12px}.toolbar select{padding:5px}.toolbar label{display:flex;gap:4px;align-items:center}.cameraControl{display:flex;align-items:center;gap:12px;padding:8px 14px;border-top:1px solid var(--line);font-size:11px;color:var(--muted)}.cameraControl input{flex:1}.cameraControl output{color:var(--text);margin-left:6px}.viewTeaching{padding:10px 14px;background:#122c30;color:#b8d7d5;font-size:12px;line-height:1.5}.anatomynote{padding:10px 14px;color:var(--muted);font-size:10px;line-height:1.5}.inspector{max-height:calc(100dvh - 100px);overflow:auto;scrollbar-width:thin}.lesson{padding:20px}.heading{display:flex;align-items:flex-start;justify-content:space-between;gap:10px}.heading button{font-size:11px}.kicker{font-size:9px;color:var(--accent);letter-spacing:1.7px;display:block;margin-bottom:9px}.status{font-size:11px;color:var(--accent);white-space:nowrap}.clue{display:flex;align-items:baseline;gap:11px;padding:15px 0;border-top:1px solid var(--line);line-height:1.5;font-size:12px}.clue span{color:var(--accent);font-size:10px}.caution{padding:12px;background:#332b24;border-left:2px solid #b79965;color:#e0cdb1;font-size:12px;line-height:1.6}.caption,small{font-size:11px;color:var(--muted);line-height:1.6}.originwalk{display:flex;gap:8px;margin-top:22px}.originwalk button{flex:1;font-size:11px}.lesson p{font-size:13px;color:#bbcad4}#explainAxis{font-size:12px;text-align:left;line-height:1.5;width:100%;color:var(--accent)}.wheelwrap svg{width:100%;touch-action:none}.wheelwrap text{fill:#a3b9c5;font-size:11px}.wheelwrap .big{font-size:14px}.sliderrow{display:flex;flex-wrap:wrap;gap:10px;font-size:12px}.sliderrow output{margin-left:auto;color:var(--gold)}.sliderrow input{width:100%}.presets{display:flex;flex-wrap:wrap;gap:5px;margin:12px 0}.presets button{font-size:10px;padding:6px}.projections{display:grid;grid-template-columns:1fr 1fr;gap:8px}.projection{background:#0e1822;padding:9px;border-radius:6px}.projection h3{display:flex;justify-content:space-between;font-size:11px}.projection p{font-size:10px}.projection svg{width:100%}.explanation{padding:15px;background:#193638;border:1px solid #315757;border-radius:7px;font-size:12px;line-height:1.7;margin-top:15px}.quizanswers{display:grid;gap:8px}#vectorTakeaway{margin-top:10px}details{margin-top:22px;color:var(--muted);font-size:12px}summary{cursor:pointer;padding:10px 0}.references{display:grid;grid-template-columns:1fr 1fr;gap:32px;padding:20px;background:#111d28;border-radius:10px}.references li{margin:10px 0}.localizeIntro{padding:16px 0 24px}.localizeIntro p{color:var(--muted)}.examples{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-top:20px}.examples span{font-size:12px;color:var(--muted);margin-right:6px}.examples button{font-size:12px}#clearFindings{margin-left:auto}.reasoningGrid{display:grid;grid-template-columns:minmax(300px,390px) minmax(0,1fr);gap:22px;align-items:start}.findings,.results{padding:24px}.finding{padding:20px 0;border-top:1px solid var(--line)}.finding label{font-weight:700;font-size:13px;line-height:1.6;display:block}.finding p{font-size:12px;color:var(--muted)}.finding select{width:100%;font-size:12px}.reason{display:flex;gap:13px;border-bottom:1px solid var(--line);padding:9px 0}.reason span{color:var(--accent);font-weight:700;margin-top:12px}.reason p{font-size:13px}.candidate{padding:17px 0;border-bottom:1px solid var(--line)}.candidateHead{display:flex;align-items:center;gap:12px;justify-content:space-between}.candidateHead h3{margin:0}.candidateHead button{font-size:11px;white-space:nowrap;color:var(--accent)}.candidate p{color:#b5c5d1;font-size:12px}.evidence{font-size:11px;color:#9dc9be}.conflict{font-size:11px;color:#d5b993;line-height:1.7;margin-top:8px}.emptyState{padding:45px 12px;color:var(--muted)}.emptyState b{color:var(--text);font-size:20px}.alternatives{margin-top:15px}.alternatives .candidate{opacity:.85}
@media(min-width:1500px){#stage{height:510px}.workspace{grid-template-columns:minmax(0,1fr) 370px}}
@media(max-width:1050px){header{padding:0 16px;gap:10px}.brand span{display:none}nav button{padding:12px 9px}.workspace{grid-template-columns:minmax(0,1fr) 290px}main{padding:14px}#stage{height:400px}#ecg{grid-template-columns:repeat(6,minmax(0,1fr))}.cutfooter{align-items:flex-start;flex-direction:column;gap:5px}.viewbar #viewName{width:100%}.reasoningGrid{grid-template-columns:330px minmax(0,1fr)}}
@media(max-width:720px){header{height:auto;flex-wrap:wrap;padding:12px}nav{order:3;width:100%}nav button{flex:1;font-size:12px}.workspace,.reasoningGrid,.references{grid-template-columns:1fr}.inspector{max-height:none}.brand{margin-right:auto}#originbar{flex-wrap:wrap}#originbar select{min-width:0;flex:1}#originbar span{display:none}#stage{height:420px}.cameraControl{flex-wrap:wrap}.cameraControl input{min-width:140px}.findings,.results{padding:18px}.localizeIntro h1{font-size:25px}.candidateHead{align-items:flex-start}#clearFindings{margin-left:0}}
/* Spatial study workspace: neutral illumination, unobstructed labels, linked differential. */
#stage{background:radial-gradient(ellipse at 50% 42%,#f7f7f2,#dce5e5);height:470px}
.label,.label.focus{background:none;border:0;padding:2px 0;border-radius:0;color:#29414b;font-weight:600;font-size:11px;text-shadow:0 1px 2px #fff;max-width:145px;white-space:normal;line-height:1.25;text-align:left}
.label.focus{color:#76531d}.stageHint,.orientation{color:#536c78}.orientation{top:12px}#cutBadge{background:#e9d4b9;color:#634624}.cameraControl{border-bottom:1px solid var(--line);padding:11px 14px}.cameraControl label{color:#e1ebef}.cameraControl output{color:var(--accent);font-size:13px;font-weight:700}#angleNumber{width:58px;min-width:58px;background:#172633;border:1px solid var(--line);border-radius:4px;color:var(--text);padding:4px}.angleHint{font-size:10px;color:var(--muted);padding:0 14px 10px;line-height:1.5}.colorKey{display:flex;gap:14px;flex-wrap:wrap;padding:10px 14px;font-size:10px;color:var(--muted);border-bottom:1px solid var(--line)}.colorKey span{display:flex;align-items:center;gap:5px}.colorKey i{display:inline-block;width:9px;height:9px;border-radius:50%}#spatialContext{padding:12px 14px;background:#173033}#spatialContext b{font-size:14px;color:#bce9df}#spatialContext p{font-size:11px;line-height:1.5;color:#b7c7cf;margin:6px 0}#showAllCandidates{font-size:10px;padding:5px 8px}#localizeHeart{min-width:0}.localizing .reasoningGrid{grid-template-columns:280px minmax(390px,1fr) 310px;gap:14px}.localizing .findings,.localizing .results{padding:17px}.localizing h2{font-size:17px}.localizing .finding{padding:13px 0}.localizing .finding p{font-size:11px}.localizing .finding select{font-size:11px}.localizing .finding label{font-size:12px}.localizing #stage{height:400px}.localizing .viewbar #viewName{width:100%;margin-bottom:3px}.localizing .viewbar button{font-size:10px;padding:6px 8px}.localizing .cameraControl{gap:7px;flex-wrap:wrap}.localizing .cameraControl input[type=range]{min-width:100px}.localizing .cutfooter{flex-direction:column;align-items:flex-start;gap:7px}.localizing .toolbar{gap:8px}.localizing #anatomyNote{display:none}.localizing #localizeHeart{position:sticky;top:12px}.localizing .candidateHead{flex-wrap:wrap;gap:6px}.localizing .candidateHead h3{font-size:13px}.localizing .reason p{font-size:11px}.localizing .heading{flex-wrap:wrap}.candidateNumber{display:inline-flex;align-items:center;justify-content:center;background:#24464b;color:#b6e0d6;border-radius:50%;width:21px;height:21px;font:700 11px sans-serif;margin-right:5px}.localizing .localizeIntro{padding:7px 0 18px}.localizing .localizeIntro h1{font-size:25px}.localizing .localizeIntro p{font-size:12px}.localizing .examples{margin-top:12px}.localizing #labels .label[role=button]{cursor:pointer;font-size:10px;max-width:112px}.localizing #labels .label[role=button]:hover{text-decoration:underline}.localizing #labels .label[role=button]:focus-visible{outline:2px solid #436b80;outline-offset:3px}
@media(max-width:1250px){.localizing .reasoningGrid{grid-template-columns:290px minmax(0,1fr)}.localizing .results{grid-column:1/-1}.localizing #localizeHeart{position:static}.localizing #candidateList{display:grid;grid-template-columns:1fr 1fr;gap:0 24px}.localizing #candidateList>details,.localizing #candidateList>.caution{grid-column:1/-1}.localizing #stage{height:450px}}
@media(max-width:720px){.localizing .reasoningGrid{display:flex;flex-direction:column}.localizing .reasoningGrid>*{width:100%}.localizing #localizeHeart{order:-1}.localizing #stage{height:400px}.localizing #candidateList{display:block}.cameraControl{gap:6px}.angleHint{font-size:10px}.label{max-width:105px;font-size:10px}}
.cameraControl #angleNumber{flex:0 0 58px}.reasoningDetails{margin:4px 0 8px;border-bottom:1px solid var(--line);font-size:11px}.reasoningDetails summary{color:var(--accent)}
.label{width:max-content}.localizing #labels .label[role=button]{max-width:145px}
.localizing .toolbar label:has(#overlay){display:none}
#guidedStudy{padding:14px;background:#132e32;border-bottom:1px solid #355359}.guideHeading{display:flex;align-items:center;justify-content:space-between;gap:10px}.guideHeading .kicker{margin:0}.guideHeading button{font-size:10px;padding:5px 8px}.guideChoices{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}.guideChoices button{font-size:11px;padding:7px 9px}#guideSuggested{color:#a7e4d4;border-color:#497f74}#guideLesson{margin-top:13px;border-top:1px solid #355359;padding-top:12px}.guideStepRow{display:flex;align-items:center;gap:10px;justify-content:space-between}.guideStepRow b{font-size:13px}.guideStepRow button{font-size:10px;padding:6px 8px;white-space:nowrap}button:disabled{opacity:.4;cursor:default}#guideInstruction{font-size:12px;color:#e3eded;margin:10px 0}#guideRemoved{font-size:10px;color:#b5c8cd}#structureButtons{display:flex;flex-wrap:wrap;gap:5px;margin-top:12px}#structureButtons button{font-size:11px;padding:7px 9px;border-color:#567d71}#structureButtons button.active{background:#35674f;color:#fff;border-color:#91c893}#structureDescription{margin-top:9px;padding:10px;background:#102329;font-size:11px;line-height:1.6;color:#d3e5e1;border-radius:5px;min-height:48px}#guideEcg{font-size:11px;line-height:1.6;color:#b4dfd4;border-left:2px solid #649e8f;padding-left:10px}#guideLesson>label{font-size:11px;color:#c0d4d8}#intactReference{position:absolute;right:9px;top:9px;width:126px;border:1px solid #afc1c6;background:#f7f9f6ed;border-radius:6px;z-index:2;pointer-events:none;text-align:center;padding:5px;color:#3b5661}#intactReference>span{font-size:9px;font-weight:700;display:block}#miniStage{height:105px;width:114px}#miniOrientation{font-size:8px;color:#58717b;display:block}.guided #stage,.localizing.guided #stage{height:480px}.guided .orientation{display:none!important}.guided .toolbar label[for=layer],.guided #layer{opacity:.6}#advancedCut{margin:0;border-top:1px solid #344b59;border-bottom:1px solid #344b59;background:#14242e}#advancedCut>summary{padding:12px 15px;font-size:12px;color:#b5c8d0}.advancedNote{padding:0 15px;font-size:11px;color:#9fb5bf}#advancedCut .cutpanel{border-bottom:0}.guided #viewTeaching{display:none}.localizing.guided #localizeHeart{position:static}.localizing #guidedStudy{padding:12px}.localizing .guideStepRow{flex-wrap:wrap}.localizing .guideStepRow b{order:-1;width:100%}.localizing .guideChoices button{font-size:10px}.guided .label[role=button]{cursor:pointer}.guided .label[role=button]:hover{text-decoration:underline}
@media(max-width:720px){#intactReference{width:105px}#miniStage{width:93px;height:90px}.guideStepRow{flex-wrap:wrap}.guideStepRow b{order:-1;width:100%}.guided #stage,.localizing.guided #stage{height:460px}}
.inspector>#guideLesson{background:#132e32;border:1px solid #355359;border-radius:10px;padding:16px;margin:0}.guided #atlasLesson{display:none!important}.inspector .guideStepRow{flex-wrap:wrap}.inspector .guideStepRow b{order:-1;width:100%}.results>#guideLesson{margin:0 0 20px;padding:0 0 16px;border-top:0;border-bottom:1px solid #355359}.guided #guidedStudy{padding-bottom:14px}.guided #structureButtons button{font-size:10px}.guided #guideEcg{font-size:11px}.guided .inspector{max-height:none}

#guideNavigation{padding:14px 16px;background:#254b49;border-bottom:1px solid #63948a;position:sticky;top:0;z-index:5}#guideNavigation[hidden]{display:none}#guideNavigation .guideStepRow{flex-wrap:wrap}#guideNavigation .guideStepRow b{font-size:15px;order:0;width:auto}#guideNavigation button{font-size:13px;padding:11px 16px}#guideNext{background:#b7ead6;color:#102b26;border-color:#b7ead6;font-weight:750}#guideNavigation p{margin:9px 0 0;line-height:1.5}#heartPanel>#guideLesson{padding:14px 16px;margin:0;border-top:1px solid #355359;background:#132e32}#electricalControls{display:flex;align-items:center;flex-wrap:wrap;gap:10px;padding:12px 14px;background:#182f39;font-size:12px}#leadDisplay{padding:8px;border-radius:6px;background:#0e202a;color:#e4f2f1;border:1px solid #578080}#electricalControls span{font-size:11px}.originDot{display:inline-block;width:11px;height:11px;background:#ed3d69;border:2px solid white;border-radius:50%;vertical-align:middle}.vectorKey{color:#efbb55}#electricalHelp{font-size:11px;line-height:1.5;padding:0 14px;margin:8px 0;color:#bed0d6}#miniVectorNote{display:block;font-size:9px;color:#79591f;margin-top:3px}#intactReference{width:142px}#miniStage{width:130px;height:112px}.label.focus{color:#b81d4b!important;font-weight:750}.toolbar label:has(#overlay){display:none!important}@media(max-width:720px){#guideNavigation .guideStepRow b{width:100%;order:-1}#guideNavigation button{flex:1}#intactReference{width:112px}#miniStage{width:100px;height:90px}}

.guided #anatomyWorkspace{grid-template-columns:minmax(0,1fr)}.guided #anatomyWorkspace>.inspector{display:none}

/* Keep origin selection and lead controls beside the current study view. */
#originbar{display:none!important}#originPicker{padding:18px;margin-bottom:12px}#originPicker[hidden]{display:none}#originPicker h2{font-size:19px;margin:0 0 7px}#originPicker p{font-size:12px;color:var(--muted);line-height:1.5;margin:0 0 15px}.originGroup h3{font-size:10px;text-transform:uppercase;letter-spacing:1px;color:#9bb6bd;margin:16px 0 7px}.originGroup button{display:flex;align-items:center;gap:8px;width:100%;text-align:left;font-size:12px;line-height:1.35;padding:9px 10px;margin:4px 0}.originChoiceDot{width:7px;height:7px;border:1px solid #647c87;border-radius:50%;flex-shrink:0}.originGroup button.active{background:#263e42;border-color:#86c4b9;color:#e7fff7}.originGroup button.active .originChoiceDot{background:#ed3d69;border-color:#ed3d69}.workspace,.guided #anatomyWorkspace{grid-template-columns:minmax(0,1fr) 310px;align-items:start}.guided #anatomyWorkspace>.inspector{display:block}.inspector{position:sticky;top:12px;max-height:calc(100dvh - 24px);overflow:auto}#ecgPanel{border-top:1px solid #3b5960;border-bottom:1px solid #3b5960;background:#162b34;padding:12px 14px}#ecgPanel #electricalControls{padding:7px 0;background:none}#ecgPanel #electricalHelp{padding:0;margin:5px 0 10px;font-size:10px}#ecgPanel .docktitle{margin-bottom:0}#ecgPanel #ecg{grid-template-columns:repeat(12,minmax(0,1fr))}#ecgPanel .selectedLead{min-height:26px}body:not([data-mode="atlas"]) #ecgPanel .ecglead svg,body:not([data-mode="atlas"]) #selectedTrace{display:none}body:not([data-mode="atlas"]) .ecglead{padding:8px 3px}.localizing #ecgPanel{display:block}.localizing #ecgPanel #ecg{grid-template-columns:repeat(6,minmax(0,1fr))}@media(max-width:900px){.workspace,.guided #anatomyWorkspace{grid-template-columns:minmax(0,1fr) 250px}#originPicker{padding:12px}#ecgPanel #ecg{grid-template-columns:repeat(6,minmax(0,1fr))}}@media(max-width:650px){.workspace,.guided #anatomyWorkspace{grid-template-columns:1fr}.inspector{position:static;max-height:none}.originGroup button{font-size:13px}}

body[data-mode="vector"] #ecg,body[data-mode="vector"] .selectedLead{display:none}

body[data-mode="atlas"] .ecglead .polarity{display:block;font-size:9px;color:#b8d2da;line-height:1.5}.ecglead svg{height:24px}

#meanPanel,#studyPanel{padding:18px;margin-bottom:12px}#meanPanel h2,#studyPanel h2{font-size:19px;margin:0 0 8px}#meanDiagram{width:100%;background:#f2f6f4;border-radius:8px}#meanPanel p,#studyPanel p{font-size:12px;line-height:1.6}#meanPanel[hidden],#studyPanel[hidden]{display:none}#studyAnswers{display:grid;gap:8px}#studyAnswers button{text-align:left;padding:12px}#studyFeedback{margin:12px 0;line-height:1.6;font-size:13px;color:#c5e9df}.studyNav{display:flex;gap:8px}.studyNav button{flex:1;padding:12px}#studyNext{background:#b7ead6;color:#102b26;font-weight:700}#studyTrace svg{width:100%;background:#f2f6f4;border-radius:6px}#studyRestart{font-size:11px}.studying #originPicker,.studying #atlasLesson,.studying #ecgPanel,.studying #guidedStudy,.studying #guideNavigation,.studying #guideLesson,.studying #anatomyNote,.studying #viewTeaching{display:none!important}.studying .inspector{max-height:none;overflow:visible}.studying .workspace{grid-template-columns:minmax(0,1fr) 340px}.studying #heartPanel{position:sticky;top:12px}.studying #stage{height:540px}.viewSettings{margin:0!important;border:0;border-bottom:1px solid #355359}.viewSettings>summary{padding:10px 14px;font-size:12px}.viewSettings .viewbar{border-top:0}.viewSettings[open]{background:#142731}.patientCompass{position:absolute;left:12px;top:12px;z-index:2;color:#3b5661;font-size:10px;background:#f2f6f4dd;padding:7px;border-radius:4px;pointer-events:none}#studyIntro{padding:12px 14px;border-bottom:1px solid #355359;background:#193633}#studyIntro b{display:block}#studyIntro small{color:#b5cec9}.studying #meanPanel{margin-top:12px}@media(max-width:700px){.studying .workspace{grid-template-columns:1fr}.studying #heartPanel{position:static}.studying .inspector{grid-row:1}.studying #stage{height:360px}}

.studyNav{position:sticky;bottom:0;background:#111d28;padding:10px 0;z-index:3}#studyAnswers button:disabled{opacity:1;color:#9cafbd}#studyAnswers .correctAnswer:disabled{background:#244a41;color:#dbfff0;border-color:#76b89c}.studying .orientation{display:none!important}#heartPanel>#meanPanel{max-width:420px;margin:12px auto}body[data-mode="localize"] .selectedLead{display:none}

#pretestEcg{padding:24px;background:#14242e}#pretestEcg[hidden]{display:none}#pretestEcg h2{font-size:23px;margin:8px 0}#pretestEcg p{line-height:1.6;color:#bed0d6}#pretestEcg svg{width:100%;border-radius:8px;margin:16px 0}body.pretesting #stage,body.pretesting .viewSettings,body.pretesting .colorKey,body.pretesting #studyIntro{display:none!important}.pretesting #studyTrace{display:none}.pretesting #studyAnswers button.active{border-color:#9ce0c8;background:#294c45;color:#edfff6}.pretesting #heartPanel{position:static}#studyAnswers button{line-height:1.5}@media(max-width:700px){.pretesting .inspector{grid-row:auto}#pretestEcg{padding:14px}}
/* Clear controls, a visible vector, and adjustable study panes. */
#leadDisplay{display:none!important}#leadGroups{display:flex;gap:6px;flex-wrap:wrap;margin-top:8px}#leadGroups button{font-size:11px;padding:8px}#leadGroups small{width:100%;font-size:10px;color:#91adb9}#leadSelectionStatus{font-size:11px;color:#b6e1d6;margin:8px 0 0}#electricalControls button{font-size:11px;padding:6px 12px}#ecgPanel .selectedLead{display:none}#ecgPanel #electricalHelp{display:none}#ecgPanel .docktitle span{font-size:11px}#pvcActionBar{padding:13px 16px;background:#214740;display:flex;align-items:center;justify-content:space-between;gap:12px}#pvcActionBar[hidden]{display:none}#pvcActionBar .kicker{margin-bottom:4px}#pvcActionBar b{font-size:16px}#lessonLaunch{background:#b8e9d7;color:#14392e;font-weight:700;white-space:normal;padding:12px}#guideSuggested{font-size:10px}.studying #pvcActionBar{display:none!important}
#heartPanel>#meanPanel{max-width:none;width:auto;display:grid;grid-template-columns:170px 1fr;grid-template-rows:auto auto auto;column-gap:16px;padding:10px 16px;margin:0;border:0;border-top:1px solid #365651;border-bottom:1px solid #365651;border-radius:0;background:#183330}#heartPanel>#meanPanel[hidden]{display:none}#meanPanel .kicker{grid-column:2;font-size:9px;margin:0}#meanPanel h2{grid-column:2;font-size:17px;margin:4px 0}#meanDiagram{grid-column:1;grid-row:1 / 6;width:170px;height:125px;align-self:center}#meanPanel #meanReading{grid-column:2;margin:3px 0;line-height:1.5;font-size:12px}#meanPanel>small{grid-column:2;font-size:10px}#meanPanel h2::after{content:' · always shown';font-size:10px;color:#a7d1be;font-weight:400}.studying #meanPanel h2::after{content:''}
#anatomyWorkspace.workspace,.guided #anatomyWorkspace,.studying #anatomyWorkspace{display:grid;grid-template-columns:minmax(0,1fr) 10px var(--side-width,360px);gap:9px;align-items:start}#anatomyWorkspace[hidden]{display:none!important}.paneSplitter{align-self:stretch;min-height:300px;cursor:col-resize;background:#192e39;border:1px solid #36505b;border-radius:6px;touch-action:none;position:relative}.paneSplitter span{position:sticky;top:45vh;display:block;text-align:center;color:#8fc9bc;font-size:20px}.paneSplitter:hover,.paneSplitter:focus{background:#31574f;outline:2px solid #8fc9bc;outline-offset:1px}.resizing{cursor:col-resize;user-select:none}.inspector{max-height:calc(100dvh - 28px);position:sticky;top:14px;overflow:auto;padding-right:3px}#caseNavigation{display:flex;flex-wrap:wrap;gap:6px;background:#233b43;padding:12px;margin-bottom:10px;border-radius:8px;position:sticky;top:0;z-index:5}#caseNavigation[hidden]{display:none}#caseCounter{width:100%;font-size:11px;color:#bfddd4}#caseNavigation button{font-size:11px;padding:8px}#nextCase{margin-left:auto;color:#c4ecdb}#studyAnswers{max-height:none}.pretesting #studyAnswers{max-height:45vh;overflow:auto;padding-right:4px}#studyPanel{padding:16px}.caseExplanation h3{font-size:13px;color:#b5e1d2;margin:18px 0 5px}.caseExplanation p,.caseExplanation li{font-size:12px;line-height:1.65}.caseExplanation ul{padding-left:18px}.studying .inspector{overflow:auto;max-height:calc(100dvh - 28px)}.studying #stage{height:440px}.studying .workspace #heartPanel{position:sticky;top:14px}.lessonComplete #stage{height:520px}.lessonComplete #studyIntro{display:block!important}.pretesting #pretestEcg{padding:18px}#studyTrace svg{max-height:260px}.studying .studyNav{bottom:0}
.localizing .reasoningGrid{display:grid;grid-template-columns:var(--finding-width,360px) 10px minmax(0,1fr);gap:10px;align-items:start}.localizing .findings{padding:18px}.localizing .findings>.results{padding:0;background:none;border:0;box-shadow:none}.localizing .findings>.results[hidden]{display:none}.localizing.localizeEntering .reasoningGrid{display:block;max-width:850px;margin:0 auto}.localizeEntering .reasoningGrid>.paneSplitter{display:none}.localizing #localizeHeart[hidden]{display:none}.localizing #localizeHeart{position:sticky;top:12px}.localizing .findings>h2{font-size:16px;color:#b4cec6}.wizardSteps{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:22px}.wizardSteps button{flex:1;min-width:100px;font-size:11px;text-align:left;padding:10px}.wizardSteps small{display:block;color:#a4bbc3;line-height:1.5;margin-top:5px;font-size:10px}.wizardOptions{display:grid;gap:9px;margin:18px 0}.wizardOptions button{text-align:left;padding:14px;font-size:14px;line-height:1.5}.wizardActions{display:flex;justify-content:space-between;gap:10px}#localizeWizard h2{font-size:23px;line-height:1.4}#localizeWizard p{line-height:1.65;font-size:13px}.localizing .findings>.results .candidate{margin:12px 0}.localizing .localizeIntro{max-width:1000px;margin:auto}.localizing #findingInputs{display:none!important}.localizing .examples{margin-bottom:12px}
@media(max-width:800px){#anatomyWorkspace.workspace,.guided #anatomyWorkspace,.studying #anatomyWorkspace,.localizing .reasoningGrid{grid-template-columns:1fr}.paneSplitter{display:none}.inspector,.studying .inspector{position:static;max-height:none;overflow:visible}.studying .workspace #heartPanel,.localizing #localizeHeart{position:static}.studying .inspector{grid-row:auto}#heartPanel>#meanPanel{grid-template-columns:125px 1fr}#meanDiagram{width:125px;height:110px}#pvcActionBar{flex-wrap:wrap}#lessonLaunch{width:100%}.pretesting #studyAnswers{max-height:none}}
/* Compact heart workspace and independent result scrolling. */
body:not([data-mode="vector"]) #meanPanel{display:none!important}
#vectorTab{font-size:12px}#ecgPanel .ecglead{padding:5px 3px;min-height:0}#ecgPanel .ecglead svg{height:18px}#leadGroups button{padding:6px 8px}#leadGroups small{display:none}#ecgPanel .docktitle{margin-bottom:5px}#ecgPanel{padding:10px 14px}#electricalControls{margin:5px 0}#leadSelectionStatus{margin-top:5px}
.differentialCompare{background:#1b343a;border:1px solid #41605f;border-radius:8px;padding:12px;margin:12px 0}.differentialCompare h3{margin:0 0 6px;color:#c4edde}.differentialCompare p{font-size:12px;line-height:1.55}.comparisonRows>div{padding:10px 0;border-top:1px solid #42605e}.comparisonRows b{font-size:13px}.comparisonRows p{margin:5px 0}.comparisonRows button{padding:6px 10px;font-size:11px}.matchDetails>summary{padding:10px;cursor:pointer}.localizing:not(.localizeEntering) .wizardSteps{display:none}.localizing:not(.localizeEntering) #localizeWizard h2{font-size:20px;margin:5px 0}.localizing:not(.localizeEntering) .findings>h2{display:none}.localizing #localizeWizard p{margin:7px 0}.localizing #ecgPanel #ecg{grid-template-columns:repeat(12,minmax(0,1fr))}.localizing #ecgPanel .ecglead{padding:4px 1px;font-size:11px}.localizing #ecgPanel .docktitle span,.localizing #electricalControls span,.localizing #viewTeaching{display:none}.localizing #guidedStudy{padding:8px}.localizing #guidedStudy button{font-size:10px;padding:6px}.localizing #spatialContext{padding:8px 12px}.localizing #spatialContext p{font-size:11px;margin:5px 0}.localizing #stage{height:390px;min-height:300px}.localizing .localizeIntro h1{font-size:23px;margin:5px 0}.localizing .localizeIntro>p{margin:5px 0}.localizing .examples{margin:8px 0}.localizing .findings{padding:12px}.localizing .findings .caption{font-size:10px}.localizing #anatomyNote{font-size:10px}
@media(min-width:801px){body.localizing:not(.localizeEntering){height:100dvh;overflow:hidden}.localizing:not(.localizeEntering) main{height:calc(100dvh - 74px);display:flex;flex-direction:column;padding-top:10px;padding-bottom:10px}.localizing:not(.localizeEntering) #localizeWorkspace{display:flex;flex-direction:column;min-height:0;flex:1}.localizing:not(.localizeEntering) .localizeIntro{flex:none;width:100%;max-width:none}.localizing:not(.localizeEntering) .reasoningGrid{min-height:0;flex:1;overflow:hidden;align-items:stretch}.localizing:not(.localizeEntering) .findings,.localizing:not(.localizeEntering) #localizeHeart{height:100%;max-height:none;overflow-y:auto;overscroll-behavior:contain;position:static;min-height:0;scrollbar-gutter:stable}.localizing:not(.localizeEntering) main>details{display:none}.localizing:not(.localizeEntering) .paneSplitter{min-height:0}.localizing #localizeHeart #heartPanel{position:static}}
@media(max-width:1000px){.localizing #ecgPanel #ecg{grid-template-columns:repeat(6,minmax(0,1fr))}}
.localizing #ecgPanel .docktitle{display:none}.localizing #ecgPanel{padding:6px 12px}.localizing #electricalControls{padding:0;margin:2px 0 5px;gap:6px}.localizing #leadGroups{margin-top:5px}.localizing #leadGroups button{padding:4px 7px}.localizing #stage{height:320px;min-height:280px}.localizing #spatialContext{position:relative;padding-right:135px}.localizing #showAllCandidates{position:absolute;right:10px;top:10px;font-size:10px}.localizing .colorKey{padding:6px}
/* Fit lessons to the viewport; widen panels by reflowing content, never scaling it. */
@media(min-width:801px){
 body.studying{height:100dvh;overflow:hidden}
 body.studying main{height:calc(100dvh - 74px);padding:10px 18px;display:flex;flex-direction:column;min-height:0}
 body.studying main>details{display:none}
 body.studying #anatomyWorkspace{flex:1;min-height:0;align-items:stretch;overflow:hidden}
 body.studying #heartPanel{position:static!important;height:100%;min-height:0;display:flex;flex-direction:column;overflow:auto}
 body.studying #heartPanel>[hidden]{display:none}
 body.studying #stage{flex:1;min-height:240px;height:auto!important}
 body.studying #studyIntro{padding:8px 12px;font-size:12px;flex:none}
 body.studying #studyIntro small{font-size:11px}
 body.studying .viewSettings{flex:none}
 body.studying .viewSettings>summary{padding:7px 12px;font-size:11px}
 body.studying .colorKey{padding:7px 12px;flex:none;font-size:10px}
 body.studying .inspector{position:static;height:100%;max-height:100%;min-height:0;overflow:auto;overscroll-behavior:contain}
 body.studying .paneSplitter{min-height:0}
 body.pretesting #pretestEcg{height:100%;min-height:0;display:flex;flex-direction:column;padding:14px}
 body.pretesting #pretestEcg h2{font-size:20px;margin:5px 0}
 body.pretesting #pretestEcg p{font-size:12px;margin:5px 0;line-height:1.4}
 body.pretesting #pretestEcg svg{flex:1;min-height:0;width:100%;height:0;margin:10px 0;object-fit:contain}
 body.pretesting #pretestEcg small{font-size:10px}
 .localizing:not(.localizeEntering) .localizeIntro{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:0 0 8px;min-height:36px}
 .localizing:not(.localizeEntering) .localizeIntro>.kicker,.localizing:not(.localizeEntering) .localizeIntro>p{display:none}
 .localizing:not(.localizeEntering) .localizeIntro h1{font-size:18px;line-height:1.2;margin:0;white-space:nowrap}
 .localizing:not(.localizeEntering) .examples{margin:0;display:flex;gap:6px;flex-wrap:wrap;align-items:center}
 .localizing:not(.localizeEntering) .examples button{font-size:11px;padding:6px 9px}
 .localizing:not(.localizeEntering) .examples>span{display:none}
 .localizing:not(.localizeEntering) main{padding:8px 18px}
 .localizing:not(.localizeEntering) .findings{container-type:inline-size;font-size:12px}
 .localizing .comparisonRows{display:grid;grid-template-columns:1fr;gap:0 14px}
 @container (min-width:580px){.comparisonRows{grid-template-columns:repeat(2,minmax(0,1fr))!important}}
}
#studyPanel{padding:12px}#studyPanel h2{font-size:18px}#studyPanel p,#studyFeedback,.caseExplanation p,.caseExplanation li{font-size:12px;line-height:1.5}#studyAnswers button{padding:9px;font-size:12px}#caseNavigation{padding:8px;margin-bottom:8px}#caseNavigation button{padding:6px 8px}#studyTrace svg{max-height:200px}
.localizing .findings p,.localizing .comparisonRows p{font-size:12px;line-height:1.5}.localizing .comparisonRows b{font-size:13px}.localizing .differentialCompare{padding:10px}.localizing .differentialCompare h3{font-size:14px}.localizing .findings #resultTitle{font-size:17px}.localizing .findings #localizeWizard h2{font-size:19px}.localizing .comparisonRows>div{min-width:0}
#clearFindings{background:#b9ead7;color:#14372e;font-weight:700;border-color:#9ed8c1;white-space:nowrap}#educationDisclaimer{position:fixed;bottom:0;left:0;right:0;z-index:30;min-height:34px;padding:8px 18px;background:#14242b;border-top:1px solid #46616b;color:#c4d8dc;font-size:11px;line-height:1.5;text-align:center}#educationDisclaimer strong{color:#effbf7}body{padding-bottom:40px}
@media(min-width:801px){body.studying main,.localizing:not(.localizeEntering) main{height:calc(100dvh - 114px)}}
@media(max-width:800px){#educationDisclaimer{position:static;text-align:left}body{padding-bottom:0}}
.conceptBadge{padding:6px 9px;background:#26433e;color:#d8f4e8;border:1px solid #557d70;border-radius:5px;font-size:11px}#conceptScope{margin:0;border-top:1px solid #46616b;padding:8px 12px;font-size:12px;flex:none}#conceptScope summary{cursor:pointer;color:#c5e4dc}#conceptScope p{line-height:1.5}.studying #conceptScope{display:none}.missing{font-size:12px;line-height:1.5;margin-top:6px;color:#c9d5dc}.comparisonRows p{overflow-wrap:anywhere}button:focus-visible,summary:focus-visible,a:focus-visible{outline:3px solid #ffdc8e;outline-offset:3px}.localizing .comparisonRows div{border-bottom:1px solid #476061}#educationDisclaimer{font-size:11px}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;animation:none!important;transition:none!important}}
/* Evidence access without displacing the learning workspace. */
#markerReviewStatus{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:7px 12px;font-size:11px;background:#fff7e8;border-bottom:1px solid #e9d8b7;color:#604b25}#markerReviewStatus[hidden]{display:none}#markerReviewStatus button{font-size:11px;white-space:nowrap}.studying #markerReviewStatus{display:none}
#referenceDialog{width:min(1040px,94vw);height:min(850px,92vh);max-height:92vh;padding:0;border:1px solid #b9c9cf;border-radius:15px;color:#213b45;background:#f8fbfc;box-shadow:0 24px 80px #122b4566}#referenceDialog::backdrop{background:#18344177}.referenceHead{display:flex;align-items:center;justify-content:space-between;padding:20px 24px;background:#fff;border-bottom:1px solid #d8e2e6}.referenceHead h2{margin:5px 0 0;font-size:23px}.referenceBody{padding:20px 26px;overflow-y:auto;height:calc(100% - 92px);box-sizing:border-box;font-size:14px;line-height:1.6}.referenceBody section{scroll-margin-top:14px;margin-bottom:28px}.referenceBody h3{font-size:19px;margin:22px 0 10px}.referenceBody h4{font-size:15px;margin:7px 0}.referenceBody p{margin:8px 0}.referenceBody a{color:#176b7c;text-decoration:underline}.reviewNotice{background:#fff3dd;border-left:4px solid #b98431;padding:12px 15px}.referenceJump{display:flex;flex-wrap:wrap;gap:10px 20px;margin:18px 0}.sourceList{padding-left:22px}.sourceList li{padding:9px 0;border-bottom:1px solid #dce6e9}.sourceList p,.auditCards small{color:#526b74;font-size:12px}.auditCards{display:grid;grid-template-columns:repeat(auto-fit,minmax(290px,1fr));gap:12px}.auditCards article{padding:15px;background:white;border:1px solid #d5e1e5;border-radius:10px;scroll-margin-top:16px}.auditStatus{font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.025em;color:#886014}.referenceBody details{padding:9px 12px;margin:6px 0;background:white;border:1px solid #dae3e6}.referenceBody summary{cursor:pointer;font-weight:650}.referenceBody li{margin-bottom:10px}@media(max-width:650px){.referenceHead{padding:14px}.referenceHead h2{font-size:18px}.referenceBody{padding:14px}.auditCards{grid-template-columns:1fr}#markerReviewStatus{flex-wrap:wrap}}
.brandIdentity{display:flex;flex-direction:column;gap:3px}.brand .creator{font-size:10px;letter-spacing:.02em;color:#b6cbd0;text-transform:none}.labelToggle{display:inline-flex;align-items:center;gap:6px;margin-left:8px;font-size:12px;color:var(--text);white-space:nowrap}.labelToggle input{accent-color:#83cdb7}.regionChoice{margin:7px 0;border:1px solid #38535b;border-radius:8px;background:#14252e;color:var(--text);overflow:hidden}.regionChoice>summary{padding:13px;display:flex;gap:10px;align-items:center;justify-content:space-between;list-style:none;font-size:13px}.regionChoice>summary:after{content:'+';color:var(--accent);font-size:18px}.regionChoice[open]>summary:after{content:'−'}.regionChoice>summary small{font-size:10px;margin-left:auto;color:#a6cbbf}.regionChoice[open]{border-color:#82bca9}.regionExplanation{padding:0 13px 13px;font-size:12px;line-height:1.6}.regionExplanation p{margin:8px 0}.regionExplanation a{font-size:11px;color:var(--accent)}.localizing #candidateList{display:block!important}.localizing .findings>.heading,.localizing .findings>h2{display:none}.localizing.localizeEntering .findings>h2{display:block}.comparisonHint{font-size:11px!important;color:var(--muted)}.answerReview{margin:0 0 12px}.answerReview summary,.reasoningReview summary{padding:9px 0;font-size:12px}.reasoningReview{margin:8px 0}.localizing #nextClue{padding:12px;border-left:3px solid var(--accent);background:#203a3b;font-size:12px}.localizing .results>.heading{margin:8px 0}.localizing .alternatives{margin-top:14px}.regionChoice summary:focus-visible{outline-offset:-3px}
.brand .brandIdentity{min-width:150px}.brand .creator{max-width:none;width:auto;white-space:nowrap;line-height:1.3}.localizing #guideNavigation,.localizing #guideLesson{display:none!important}.localizing #spatialSummary{max-width:650px}.localizing .regionChoice>summary{flex-wrap:wrap}.localizing .regionChoice>summary small{white-space:nowrap}
/* Compact, width-responsive anatomy workspace. */
#guidedStudy .guideHeading{display:flex;align-items:center;flex-wrap:wrap;gap:8px;margin:0}#guidedStudy .guideHeading>.kicker{margin:0;white-space:nowrap;letter-spacing:.6px}#guidedStudy .guideChoices{display:flex;flex-wrap:wrap;gap:5px;flex:1;margin:0}#guidedStudy #guideSuggested{display:none}#guideSurface{margin-left:auto}
#heartPanel{container-type:inline-size;container-name:heartworkspace}
@container heartworkspace (min-width:760px){#ecgPanel{display:grid;grid-template-columns:1fr auto;column-gap:12px}#ecgPanel .docktitle,#ecgPanel #ecg{grid-column:1/-1}#ecgPanel #electricalControls{grid-column:1/-1}#ecgPanel #leadGroups{grid-column:1}#ecgPanel #leadSelectionStatus{grid-column:2;align-self:center;max-width:230px}#heartPanel>#guideLesson{display:grid;grid-template-columns:1fr 1fr;gap:5px 15px}#guideLesson #structureButtons,#guideLesson #guideRemoved{grid-column:1/-1}#guideLesson #structureDescription{grid-column:1}#guideLesson #guideEcg{grid-column:2}#guideLesson>label{grid-column:1/-1}}
.studying #ecgPanel{display:block!important;flex:none}.studying #ecgPanel .ecglead svg{height:22px}.studying #ecgPanel .docktitle span{display:none}.studying #ecgPanel .polarity{font-size:9px}.studying #ecgPanel .ecglead{padding:3px}.studying #ecgPanel .docktitle{margin-bottom:3px}.studying #ecgPanel #electricalControls span{display:none}
@media(min-width:801px){body:not(.localizing):not(.studying) #anatomyWorkspace{align-items:stretch;height:calc(100dvh - 125px);min-height:550px}body:not(.localizing):not(.studying) #heartPanel{height:100%;display:flex;flex-direction:column;overflow-y:auto;min-width:0}body:not(.localizing):not(.studying) #heartPanel>*{flex-shrink:0}body:not(.localizing):not(.studying) #heartPanel #stage{flex:1;min-height:280px;height:auto}body:not(.localizing):not(.studying) .inspector{position:static;height:100%;max-height:100%;overflow-y:auto}body.pretesting #pretestEcg{height:auto;flex:1;min-height:250px}body.studying #stage{min-height:230px}}
.matchGroup{margin:14px 0;padding-left:10px;border-left:3px solid #7896a5}.matchGroup h3{font-size:13px;margin-bottom:5px}.matchGroup h3 span{display:inline-block;padding:2px 6px;border-radius:10px;background:#29454b;margin-left:4px}.matchGroup>p,.matchGroup>small{font-size:11px!important;line-height:1.4!important;color:var(--muted)}.fullMatch{border-color:#82cbb1}.incompleteMatch{border-color:#8eaecb}.recheckMatch{border-color:#d5b276}

/* Preserve readable controls; pane width determines wrapping, never zoom. */
body:not(.localizing):not(.studying) #heartPanel #stage{min-height:420px}
body:not(.localizing) #ecgPanel #ecg{grid-template-columns:repeat(6,minmax(0,1fr))}
@container heartworkspace (min-width:850px){body:not(.localizing) #ecgPanel #ecg{grid-template-columns:repeat(12,minmax(0,1fr))}}

/* Focused navigation and a single contextual exploration panel. */
#referencesButton{background:transparent;border:0;font-size:12px;padding:8px;color:var(--muted)}
#anatomyGuideSidebar{display:none;padding:16px;margin-bottom:12px}
body.guided:not(.studying):not(.localizing) #anatomyGuideSidebar{display:block}
body.guided:not(.studying):not(.localizing) #originPicker,body.guided:not(.studying):not(.localizing) #atlasLesson{display:none}
#anatomyGuideSidebar #guideNavigation{position:static;padding:14px 0;background:none;border:0}
#anatomyGuideSidebar #guideLesson{padding:0;margin:0;border:0;display:block}
#anatomyGuideSidebar #guideLesson[hidden]{display:none}
#anatomyGuideSidebar .guideStepRow{display:flex;gap:8px;flex-wrap:wrap}
#anatomyGuideSidebar .guideStepRow b{width:100%;order:-1;line-height:1.5}
#anatomyGuideSidebar #guideNext{flex:1}
#anatomyGuideSidebar p{font-size:13px;line-height:1.6}
#finishExploring,#backFromAxis{font-size:12px;margin-bottom:12px}
body:not(.localizing):not(.studying) #heartPanel #stage{min-height:320px}
body[data-mode="vector"] #guidedStudy,body[data-mode="vector"] #anatomyGuideSidebar{display:none!important}
body[data-mode="vector"] #vectorLesson{display:block}
#originPicker>.kicker{font-size:11px;font-weight:700}
#originChoices #lessonLaunch{display:block;width:100%;margin:0 0 10px;padding:11px 12px;text-align:center;background:#b8e9d7;color:#14392e;border-color:#9dd4c2;font-size:13px;font-weight:700}
#originChoices [data-origin].active{margin-bottom:3px}

.studying:not(.lessonComplete) #ecgPanel{display:none!important}
#landmarkMenu{margin:0;flex:1}#landmarkMenu summary{padding:8px 0;color:var(--accent);font-size:12px}#landmarkMenu .guideChoices{padding:6px 0}
#heartPanel>.viewSettings{margin:0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
#moreExamples{margin:0;position:relative;font-size:12px}#moreExamples summary{padding:8px;cursor:pointer}#moreExamples[open]{padding:6px;background:var(--panel);border:1px solid var(--line);border-radius:8px}#moreExamples button{display:block;width:100%;margin:5px 0}#exampleContext{font-size:12px}

/* Navigation stays above scrolling canvases and never becomes a window drag region. */
body>header{position:sticky;top:0;z-index:100;isolation:isolate;flex-shrink:0;-webkit-app-region:no-drag;app-region:no-drag}
body>header nav,body>header button{position:relative;pointer-events:auto;touch-action:manipulation;-webkit-app-region:no-drag;app-region:no-drag}
main{position:relative;z-index:0}
html:fullscreen,html:-webkit-full-screen{overflow:auto;background:var(--bg)}
#contactButton{background:transparent;border:0;font-size:12px;padding:8px;color:var(--muted)}
#contactDialog{width:min(520px,92vw);padding:26px;border:1px solid var(--line);border-radius:12px;background:var(--panel);color:var(--text);box-shadow:0 20px 70px #0006}
#contactDialog::backdrop{background:#08131bb3}.contactHeading{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:18px}.contactHeading h2{margin:0}#contactDialog p{line-height:1.7}#contactDialog a{overflow-wrap:anywhere;text-decoration:underline}#closeContact{font-size:12px}