html{scrollbar-gutter:stable}
[hidden]{display:none!important}
.lab-main{max-width:1320px;margin:auto;padding:24px 24px 48px}
.lab-main h1{color:var(--navy);font-size:clamp(24px,2.6vw,34px);line-height:1.2;margin:4px 0 8px}
.lab-intro{margin:0 0 18px;color:var(--ink-2);max-width:880px;font-size:15px;line-height:1.5}
.experiment-main .eyebrow{margin:0 0 5px;font-size:11px}
.lab-grid{display:grid;grid-template-columns:282px minmax(0,1fr);gap:20px;align-items:start}
.lab-controls{grid-column:1;grid-row:1;padding:16px;background:var(--soft);border:1px solid var(--line);border-radius:8px;min-width:0}
.lab-workspace{grid-column:2;grid-row:1;min-width:0;background:#fff}
.lab-main h2{margin:0 0 8px;font-size:15px;color:var(--navy)}
.lab-main button,.lab-main select,.lab-main input[type=number]{font:inherit;font-size:13px;line-height:1.3;color:var(--navy);border:1px solid #bac7d4;border-radius:5px;background:white;min-height:38px;padding:7px 9px}
.lab-main button{cursor:pointer}.lab-main button:hover{border-color:var(--teal)}
.lab-main button[aria-pressed=true]{border-color:var(--teal-ink);background:var(--teal-50);box-shadow:inset 3px 0 var(--teal-ink);font-weight:650}
.lab-main button:disabled,.lab-main input:disabled,.lab-main select:disabled{opacity:.55;cursor:default}
.lab-main :is(button,select,input,summary,.plot-frame):focus-visible{outline:3px solid #087d86;outline-offset:2px}
.placement-buttons{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px;margin:10px 0}
.placement-buttons button{text-align:left;min-height:46px;font-size:12px}
.check-row{display:flex;gap:7px;align-items:center;font-size:12px;min-height:36px;line-height:1.35}
.check-row input{accent-color:var(--teal-ink);width:16px;height:16px;flex:none}
.live-settings{display:grid;grid-template-columns:minmax(0,1fr) 85px;gap:8px;margin:12px 0 14px}
.field-row{display:grid;align-content:start;gap:5px;font-size:12px;min-width:0}.field-row select,.field-row input{width:100%;min-width:0;box-sizing:border-box}
.control-hint{font-size:12px;line-height:1.5;color:var(--ink-2);margin:6px 0 10px}.lab-controls #reset{width:100%;margin-top:6px}
.lab-toolbar{display:flex;align-items:center;justify-content:space-between;gap:8px;height:44px}
.view-switch{display:flex;gap:5px}.lab-toolbar #pause{width:106px;flex:none;background:#0b2a5b;color:white;border-color:#0b2a5b}
.plot-head{display:flex;align-items:center;justify-content:space-between;gap:8px;height:33px}
.plot-head h2{margin:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.plot-head span{font-size:11px;color:var(--muted);white-space:nowrap}
.comparison-controls{display:flex;align-items:center;gap:16px;min-height:40px;flex-wrap:wrap}.comparison-controls>label:first-child{display:flex;align-items:center;gap:8px;font-size:12px}.comparison-controls select{min-height:32px;padding:4px 7px}
.trace-legend{height:29px;font-size:12px;display:flex;align-items:center;gap:18px;white-space:nowrap}
.trace-legend span:before{content:'';display:inline-block;width:24px;border-top:3px solid #0b2a5b;vertical-align:middle;margin-right:6px}.trace-legend .reference:before{border-color:#087d86}
.plot-frame{border:1px solid #d8dfe7;border-radius:6px;overflow:auto;background:white;position:relative;height:440px;overscroll-behavior:auto;scrollbar-gutter:stable}
#ecg{display:block;width:100%;height:440px}#workspace[data-lead-view=all] #ecg{height:720px}
.plot-footer{font-size:10px;color:var(--muted);margin:5px 0;line-height:15px}
.lab-status{font-size:12px;line-height:18px;color:var(--ink-2);height:36px;overflow:auto;margin:4px 0 0}
.lab-explanation{font-size:11px;line-height:17px;color:var(--ink-2);margin:4px 0 0;min-height:34px}
#heart-panel{height:509px;overflow:auto;border:1px solid #d8dfe7;border-radius:6px;padding:12px;box-sizing:border-box}
.lab-detail{display:grid;grid-template-columns:150px minmax(0,1fr);gap:18px;align-items:start}
.electrode-map{margin:0;background:#f3f6f9;border-radius:6px;padding:8px 4px}.electrode-map svg{display:block;width:100%;height:260px;border:0}.electrode-map figcaption{font-size:10px;text-align:center;color:var(--muted)}
.diagram-heading{font-size:11px;font-weight:650;color:#476077;text-align:center;margin:3px 0 8px}.body-site-label{font:11px 'Segoe UI',sans-serif;fill:#526b80}.body-cable-label{font:600 14px 'Segoe UI',sans-serif;fill:#173e5e}
.heart-panel{min-width:0}.heart-panel h2{margin-bottom:0}.heart-panel small{font-size:11px;font-weight:400}.heart-views{display:flex;gap:8px;align-items:center}.heart-views>.anatomy-heart{width:70%;min-width:0;height:275px;border:0}.vector-view{width:30%;max-width:190px}.vector-view svg{width:100%;min-width:0;height:auto;aspect-ratio:1;border:0}.vector-view p{text-align:center}
.heart-panel p{font-size:11px;line-height:16px;margin:5px 0}.heart-panel #heart-event{height:32px;overflow:auto}.heart-key{color:#526779;font-size:11px;line-height:1.5;margin-top:7px}.heart-key summary{cursor:pointer;font-weight:600}
.chamber-label{font:600 12px 'Segoe UI',sans-serif;fill:#526779}.anatomy-label{font:11px 'Segoe UI',sans-serif;fill:#36536c}.anatomy-label path{fill:none;stroke:#7891a5;stroke-width:1}.diagram-fine{font:10px 'Segoe UI',sans-serif;fill:#526b80}.heart-node circle{fill:#fff;stroke:#7c95a9;stroke-width:1.8}.heart-node[data-evidence=engine_event] circle{fill:#168c87;stroke:#0d6863;filter:drop-shadow(0 0 4px #78d2c8)}.heart-node[data-evidence=engine_gate] circle{fill:#e8b64f;stroke:#a47b23}.heart-node[data-evidence=illustrative] circle{fill:#e8e4dd;stroke:#8e8068;stroke-dasharray:2 2}
.session-note{font-size:12px;line-height:1.5;color:var(--ink-2);margin:18px 0 10px}.lab-notice{font-size:12px;line-height:1.6;padding:12px 14px;background:var(--soft);border-left:3px solid var(--teal);margin:14px 0}.lab-notice summary{cursor:pointer;font-weight:600}.lab-notice p{margin:8px 0 0}.lab-links{font-size:12px;line-height:1.7}.lab-meta{font-size:10px;color:var(--muted)}
.lab-card{display:block;max-width:640px;border:1px solid var(--line);border-radius:8px;padding:24px;text-decoration:none;color:var(--ink);margin:24px 0}.lab-card:hover{border-color:var(--teal)}.lab-card h2{color:var(--navy);margin:0 0 8px;font-size:23px}.lab-card p{margin:0 0 12px}.lab-card span{color:var(--teal-ink);font-weight:650}
@media(max-width:959px){
 .lab-main{padding:18px 16px 36px}.lab-grid{grid-template-columns:minmax(0,1fr);gap:12px}.lab-workspace{grid-column:1;grid-row:1;position:sticky;top:var(--lab-nav-height,88px);z-index:5;border-bottom:1px solid #bac7d4;padding-bottom:5px}.lab-controls{grid-column:1;grid-row:2;padding:12px}.placement-buttons{grid-template-columns:repeat(3,minmax(0,1fr))}.live-settings{grid-template-columns:minmax(0,1fr) 110px}.lab-controls #reset{width:auto;min-width:160px}
 .plot-frame{height:260px}#ecg{height:260px}#workspace[data-lead-view=all] #ecg{height:2160px}#heart-panel{height:329px}.lab-status{height:36px}
}
@media(max-width:600px){
 .site-nav{gap:8px;padding:10px 12px;flex-wrap:wrap}.site-nav .logo img{height:24px}.site-nav nav a{font-size:12px;padding:5px 7px}.site-nav .site-meta a{font-size:12px;padding:5px 4px}
 .lab-main{padding:14px 12px 30px}.lab-main h1{font-size:24px}.lab-intro{font-size:13px;margin-bottom:12px}.lab-toolbar{gap:5px;height:44px}.lab-toolbar button{font-size:11px;padding:6px 8px}.view-switch{gap:4px}.lab-toolbar #pause{width:91px}.plot-head h2{font-size:13px}.plot-head span{font-size:10px}.comparison-controls{gap:8px;min-height:40px}.comparison-controls .check-row{font-size:11px;gap:4px}.comparison-controls>label:first-child{gap:4px;font-size:11px}.comparison-controls select{max-width:92px;font-size:11px}.trace-legend{font-size:11px;gap:12px}.trace-legend span:before{width:18px}.plot-footer{font-size:9px}.lab-status{font-size:11px;line-height:17px;height:34px}
 .lab-detail{grid-template-columns:1fr;gap:12px}.electrode-map{display:grid;grid-template-columns:minmax(0,1fr) 130px;align-items:center;padding:5px 8px}.electrode-map .diagram-heading{grid-column:1;grid-row:1}.electrode-map svg{grid-column:2;grid-row:1/3;height:190px}.electrode-map figcaption{grid-column:1;grid-row:2}.heart-views{display:grid;grid-template-columns:minmax(0,1fr);gap:0}.heart-views>.anatomy-heart{width:100%;height:250px}.vector-view{width:100%;max-width:none;display:grid;grid-template-columns:1fr 115px;align-items:center}.vector-view svg{grid-column:2;grid-row:1/4;width:115px;height:115px}.vector-view .diagram-heading,.vector-view p{grid-column:1}
}
@media(max-width:959px) and (max-height:620px){.lab-workspace{position:static}}

.narrow-label{display:none}
@media(min-width:960px){.experiment-main{padding-top:16px}.experiment-main h1{font-size:27px}.experiment-main .lab-intro{font-size:14px;margin-bottom:12px}.experiment-main .live-settings{grid-template-columns:minmax(0,1fr)}.experiment-main .field-row:last-child{grid-template-columns:1fr 85px;align-items:center}.experiment-main .field-row:last-child input{height:36px}}
@media(min-width:960px) and (max-height:850px){.plot-frame{height:360px}#ecg{height:360px}#heart-panel{height:429px}}
@media(max-width:380px){.wide-label{display:none}.narrow-label{display:inline}.comparison-controls{gap:7px}.comparison-controls select{max-width:76px}.lab-toolbar button{font-size:10px;padding:5px 6px}.lab-toolbar #pause{width:82px}}

.lead-scroll-hint{display:none;margin-left:auto;color:#526779;font-size:10px}.trace-legend .lead-scroll-hint:before{display:none}#workspace[data-lead-view=all] .lead-scroll-hint{display:inline}
@media(max-width:600px){.lab-detail>.heart-panel{grid-row:1}.lab-detail>.electrode-map{grid-row:2}.lead-scroll-hint{font-size:9px}.trace-legend{gap:8px}}

#workspace[data-comparison=overlay] .trace-legend .reference:before{border-top-style:dashed}

.reference-note{font-size:11px;line-height:16px;min-height:32px;margin:4px 0 0;color:#36536c}
.trace-help{font-size:12px;line-height:1.5;margin:12px 0;color:var(--ink-2)}.trace-help summary{cursor:pointer;font-weight:600}.trace-help .lab-explanation{min-height:0;margin:6px 0 0}

.comparison-selects,.comparison-toggles{display:flex;align-items:center;gap:16px}.comparison-selects label{display:flex;align-items:center;gap:7px;font-size:12px}
.trace-legend span:before{border-top-color:var(--current-color,#0b2a5b)}.trace-legend .reference:before{border-top-color:var(--reference-color,#087d86)}
#workspace[data-theme=monitor] .trace-legend span:before{background:#101722;box-shadow:0 0 0 3px #101722;border-radius:1px}
#workspace[data-theme=monitor] .trace-legend .lead-scroll-hint:before{box-shadow:none}
@media(max-width:959px){.comparison-controls{height:72px;min-height:72px;display:flex;flex-direction:column;align-items:flex-start;justify-content:center;gap:0}.comparison-selects,.comparison-toggles{height:36px;gap:16px}.comparison-selects label{font-size:12px}.comparison-selects select{max-width:none;min-height:30px}.comparison-toggles .check-row{min-height:32px}.comparison-toggles .wide-label{display:inline}.comparison-toggles .narrow-label{display:none}#heart-panel{height:361px}}
@media(max-width:380px){.comparison-selects{gap:10px}.comparison-selects label{font-size:11px;gap:5px}.comparison-selects select{font-size:11px;padding-left:5px;padding-right:5px}.comparison-selects #lead-view{max-width:84px}}

@media(max-width:380px){#workspace[data-lead-view=all] .trace-legend{font-size:10px;gap:6px}#workspace[data-lead-view=all] .trace-legend span:before{width:14px;margin-right:4px}}

#workspace[data-lead-view=single] .plot-frame{overflow:hidden;scrollbar-gutter:auto}#workspace[data-lead-view=single] #ecg{height:100%}