:root{color-scheme:dark;--bg:#0a1016;--panel:#101820;--edge:#26323c;--text:#e7edf1;--muted:#97a8b7;--accent:#5cd8c4;font-family:Inter,Arial,sans-serif;font-size:16px}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text)}button,select,input{font:inherit}button,select{border:1px solid #34434f;background:#192630;color:var(--text);border-radius:6px;min-height:40px;padding:8px 13px}button{cursor:pointer}button:hover{background:#243b47}button:disabled{opacity:.45;cursor:default}button:focus-visible,select:focus-visible,input:focus-visible{outline:2px solid var(--accent);outline-offset:3px}.topbar{height:76px;border-bottom:1px solid var(--edge);padding:0 30px;display:flex;align-items:center;justify-content:space-between}.brand{font-size:22px;font-weight:800;letter-spacing:2px;display:flex;align-items:center}.brand span{font-weight:400}.brand i{height:25px;width:1px;background:var(--edge);margin:0 23px}.brand strong{font-size:19px;letter-spacing:-.4px;font-weight:500}.topmeta{display:flex;align-items:center;gap:20px;color:var(--muted);font-size:14px}.badge{border:1px solid #376254;color:#92d6bf;padding:6px 9px;border-radius:4px;font-size:12px;letter-spacing:.9px}main{max-width:1920px;margin:auto;padding:27px 30px 0}.toolbar{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:24px}h1{font-size:27px;letter-spacing:-.7px;margin:0 0 7px;font-weight:500}.toolbar p{color:var(--muted);margin:0;font-size:16px}.actions{display:flex;gap:8px}.workspace{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.1fr) 276px;gap:14px;align-items:start}.panel{background:var(--panel);border:1px solid var(--edge);border-radius:9px;overflow:hidden}.panelhead{min-height:54px;display:flex;justify-content:space-between;align-items:center;padding:12px 16px;gap:8px;border-bottom:1px solid var(--edge)}h2{font-size:14px;margin:0;color:var(--muted);font-weight:400;white-space:nowrap}h2 span{color:var(--text);margin-left:10px;font-size:16px;font-weight:500}.quiet{font-size:12px;color:var(--muted)}.viewport{position:relative;width:100%;height:clamp(370px,54vh,660px);background:#070b0f}.viewport canvas{display:block;width:100%;height:100%;touch-action:none}#overlay{position:absolute;inset:0;pointer-events:none}.anatomy .viewport{background:radial-gradient(ellipse at center,#1b2933 0%,#0c131b 72%)}.viewhint{position:absolute;bottom:18px;left:0;right:0;text-align:center;color:var(--muted);font-size:13px;pointer-events:none}.panelbottom{padding:14px 16px;border-top:1px solid var(--edge);min-height:50px;display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:14px}.panelbottom label{display:flex;align-items:center;gap:7px}input[type=checkbox]{width:16px;height:16px;accent-color:var(--accent)}.key{color:var(--muted);font-size:12px;display:flex;align-items:center;gap:7px}.key i{width:13px;height:9px;background:#5cd8c44d;border:1px solid var(--accent)}.scanmeta{position:absolute;top:17px;left:18px;right:18px;display:flex;justify-content:space-between;font-size:12px;color:#bbcbd3;pointer-events:none;gap:10px}.scanfooter{position:absolute;bottom:16px;left:18px;right:18px;display:flex;justify-content:space-between;font:12px monospace;color:#92b6af;pointer-events:none}#loading{position:absolute;inset:0;background:#080e14ed;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:14px;padding:32px;text-align:center}#loading strong{font-size:19px;font-weight:500}#loading span{font-size:14px;line-height:1.6;color:var(--muted)}#loading.hidden{display:none}.controls .panelhead h2{font-size:16px;color:var(--text);font-weight:500}fieldset{border:0;margin:0;padding:0}.control-section{padding:17px 18px;border-bottom:1px solid var(--edge)}.control-section:last-child{border:0}h3{font-size:14px;color:var(--accent);font-weight:500;margin:0 0 17px}.field-label{font-size:14px;display:block;margin-bottom:9px}select{width:100%;font-size:14px}.small{font-size:12px;line-height:1.5;color:var(--muted);margin:9px 0 0}.range-row{margin-top:16px}.range-row:first-of-type{margin-top:0}.range-row label{display:flex;justify-content:space-between;gap:8px;font-size:14px}.range-row output{color:#b2c5cf;font-size:13px;font-variant-numeric:tabular-nums}input[type=range]{accent-color:var(--accent);width:100%;margin:10px 0 0;height:15px}footer{display:flex;justify-content:space-between;color:var(--muted);gap:16px;font-size:12px;padding:19px 0 25px;line-height:1.6}dialog{background:#13202a;color:var(--text);border:1px solid #405660;border-radius:12px;width:min(760px,94vw);max-height:86vh;padding:24px}dialog::backdrop{background:#000a;backdrop-filter:blur(5px)}.dialoghead{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:20px}.dialoghead h2{color:var(--text);font-size:21px;white-space:normal}#method-content{line-height:1.7;font-size:16px}#method-content h3{font-size:16px;margin:23px 0 8px}#method-content ul{padding-left:22px}#method-content a{color:var(--accent)}#method-content table{width:100%;border-collapse:collapse;font-size:14px}#method-content th,#method-content td{text-align:left;border-bottom:1px solid var(--edge);padding:7px 10px 7px 0}button.active{border-color:var(--accent);color:var(--accent)}@media(min-width:1600px){.workspace{grid-template-columns:minmax(0,1fr) minmax(0,1.1fr) 290px}}@media(max-width:1180px){.workspace{grid-template-columns:1fr 1fr}.controls{grid-column:1/-1}.controls fieldset{display:grid;grid-template-columns:repeat(4,1fr)}.control-section{border-bottom:0;border-right:1px solid var(--edge)}.viewport{height:480px}.topmeta>span:first-child{display:none}.toolbar{align-items:flex-start}.actions{flex-wrap:wrap;justify-content:flex-end}}@media(max-width:700px){main{padding:20px 14px 0}.topbar{padding:0 16px;height:64px}.brand{font-size:19px}.brand i{margin:0 14px}.brand strong{font-size:17px}.topmeta{display:none}.toolbar{display:block}.toolbar p{font-size:14px;line-height:1.6}.actions{margin-top:15px;justify-content:flex-start}.actions button{font-size:14px}.workspace{grid-template-columns:1fr}.ultrasound{grid-row:1}.anatomy{grid-row:2}.controls{grid-row:3}.viewport{height:420px}.controls fieldset{grid-template-columns:1fr 1fr}.control-section{border-bottom:1px solid var(--edge)}footer{display:block}footer span{display:block;margin-bottom:6px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto}}

.heartbeat-controls button{width:100%;margin-bottom:16px}.heartbeat-controls .range-row:last-child{margin-bottom:0}

.panel-actions{display:flex;align-items:center;gap:12px}.panel-actions button{font-size:12px;min-height:30px;padding:5px 9px}.us-expanded .workspace{grid-template-columns:minmax(0,1fr) 290px}.us-expanded .anatomy{display:none}.us-expanded .ultrasound .viewport{height:calc(100vh - 270px);min-height:480px;max-height:1200px}.us-expanded .controls{grid-column:auto}.us-expanded .controls fieldset{display:block}.us-expanded .control-section{border-right:0;border-bottom:1px solid var(--edge)}
@media(max-width:800px){.us-expanded .workspace{grid-template-columns:minmax(0,1fr)}.us-expanded .controls{grid-row:2}.us-expanded .ultrasound .viewport{height:72vh;min-height:420px}.panelbottom .quiet{display:none}}

.small a{color:var(--accent);text-underline-offset:3px}.scanmeta #preset-label{max-width:65%}
.controls{grid-column:3;grid-row:1/span 2}.ecg-panel{grid-column:1/3;grid-row:2}.ecg-panel canvas{display:block;width:100%;height:170px;cursor:crosshair;touch-action:pan-y}.ecg-status{border-top:1px solid var(--edge);padding:11px 16px;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:14px}.ecg-status #electrical-stage{color:#a8e6c1}.ecg-status #flow-status{font-variant-numeric:tabular-nums;color:#b8c8d0}.check-row{display:flex;gap:8px;align-items:center;font-size:14px;margin-top:15px}.physiology-legend{position:absolute;bottom:47px;left:12px;right:12px;display:flex;justify-content:center;flex-wrap:wrap;gap:12px;font-size:12px;pointer-events:none;color:#b8c9ce}.physiology-legend span{padding:5px 7px;background:#091219c9;border-radius:4px}.physiology-legend i{display:inline-block;width:7px;height:7px;border-radius:50%;margin-right:5px}.ecg-panel .panelhead h2{white-space:normal}.ecg-panel .panelhead>.quiet{text-align:right}.us-expanded .ecg-panel{grid-column:1;grid-row:2}.us-expanded .controls{grid-column:2;grid-row:1/span 2}
@media(max-width:1180px){.controls{grid-column:1/-1;grid-row:3}.ecg-panel{grid-column:1/-1;grid-row:2}.controls fieldset{grid-template-columns:repeat(3,minmax(0,1fr))}.control-section{min-width:0}.us-expanded .controls{grid-column:2;grid-row:1/span 2}.us-expanded .controls fieldset{display:block}}
@media(max-width:800px){.us-expanded .controls{grid-column:1;grid-row:3}.us-expanded .ecg-panel{grid-column:1;grid-row:2}}
@media(max-width:700px){.ecg-panel{grid-column:1;grid-row:3}.controls{grid-column:1;grid-row:4}.controls fieldset{grid-template-columns:1fr 1fr}.ecg-panel .panelhead{align-items:flex-start}.ecg-panel .panelhead>.quiet{max-width:42%;line-height:1.4}.ecg-panel canvas{height:165px}.ecg-status .quiet{width:100%}.physiology-legend{gap:6px}.panelhead h2 span{font-size:14px}.panelhead{padding:11px 12px}}

.review-link{color:#abd7d1;font-size:14px;text-decoration:none;padding:10px 12px;border:1px solid #32444a;border-radius:7px}.review-link:hover{background:#22353a}

.context-options{display:grid;gap:10px;margin:18px 0 8px;font-size:13px}.context-options label{display:flex;gap:8px;align-items:center}.context-options p{font-size:12px;line-height:1.5;margin:0}.anatomy .panelbottom{flex-wrap:wrap;gap:12px}

.audio-controls{padding:12px 16px;border-top:1px solid var(--edge);display:flex;align-items:center;justify-content:space-between;gap:12px 24px;flex-wrap:wrap}.audio-toggle{display:flex;flex-direction:column;gap:6px;align-items:flex-start}.audio-toggle button{font-size:13px;min-height:36px}.audio-toggle .quiet{font-size:11px;max-width:280px;line-height:1.4}.audio-volume{flex:1 1 110px;max-width:180px;min-width:100px}.audio-volume label{display:flex;justify-content:space-between;font-size:12px;gap:14px;color:var(--muted)}.audio-volume output{font-variant-numeric:tabular-nums}.audio-volume input{margin-top:8px}

/* Responsive controls use the same inputs in a native dialog on small screens. */
[hidden]{display:none!important}.panel,.panelhead,.panelhead h2,.controls,fieldset{min-width:0}.panelhead h2{white-space:normal}.actions{flex-wrap:wrap}.range-row label{flex-wrap:wrap}.range-row output{white-space:nowrap}select{min-width:0;max-width:100%}.mobile-nav,#close-controls{display:none}.zoom-controls{position:absolute;right:12px;bottom:78px;display:flex;flex-direction:column;gap:8px}.zoom-controls button{width:44px;height:44px;padding:0;font-size:24px;background:#101c26e8}.viewhint{padding:0 12px;font-size:12px;line-height:1.4}.audio-toggle .quiet{font-size:12px}.panelbottom label{min-height:32px}.controls-dialog{padding:0;margin:auto 0 0;width:100%;max-width:none;max-height:78vh;max-height:78dvh;border-radius:16px 16px 0 0;border-bottom:0;overflow:auto;overscroll-behavior:contain}.controls-dialog::backdrop{background:#0006;backdrop-filter:none}.controls-dialog .controls{border:0;border-radius:0;display:block}.controls-dialog .panelhead{position:sticky;top:0;z-index:2;background:var(--panel);padding:12px 18px;min-height:64px}.controls-dialog #close-controls{display:block;min-height:44px}.controls-dialog fieldset{display:grid!important;grid-template-columns:repeat(2,minmax(0,1fr))!important;padding-bottom:env(safe-area-inset-bottom,0px)}.controls-dialog .control-section{border-bottom:1px solid var(--edge);border-right:1px solid var(--edge);margin:0;padding:18px}.controls-dialog .context-options{align-content:start}.controls-dialog select{font-size:16px;min-height:44px}.controls-dialog .field-label,.controls-dialog .range-row label,.controls-dialog .check-row,.controls-dialog .context-options label{font-size:14px}.controls-dialog .check-row,.controls-dialog .context-options label{min-height:44px}.controls-dialog input[type=range]{height:44px;margin-top:2px}.controls-dialog input[type=checkbox]{flex:0 0 20px;width:20px;height:20px}.controls-dialog .small{font-size:13px;overflow-wrap:anywhere}#method-content{overflow-wrap:anywhere}#method-content table{table-layout:fixed}#method-dialog{padding-bottom:max(24px,env(safe-area-inset-bottom,0px))}
.mobile-layout main{padding:16px max(12px,env(safe-area-inset-right,0px)) 0 max(12px,env(safe-area-inset-left,0px))}.mobile-layout .topbar{height:auto;min-height:58px;padding:12px max(16px,env(safe-area-inset-right,0px)) 12px max(16px,env(safe-area-inset-left,0px))}.mobile-layout .topmeta{display:none}.mobile-layout .brand{font-size:19px}.mobile-layout .brand i{margin:0 12px}.mobile-layout .brand strong{font-size:17px}.mobile-layout .toolbar{display:block;margin-bottom:14px}.mobile-layout h1{font-size:24px}.mobile-layout .toolbar p{font-size:14px;line-height:1.45}.mobile-layout .actions{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin-top:14px}.mobile-layout .actions button{padding:8px 6px;font-size:13px;min-height:44px}.mobile-layout .actions .review-link{font-size:12px;line-height:1.4;min-height:36px;padding:8px;display:flex;align-items:center}.mobile-layout .actions .review-link:first-of-type{grid-column:span 2}.mobile-layout .mobile-nav{display:flex;gap:10px;position:sticky;top:0;z-index:5;padding:10px 0;background:var(--bg)}.mobile-layout .mobile-view-switch{display:flex;flex:1;gap:4px;border:1px solid var(--edge);padding:3px;border-radius:8px}.mobile-layout .mobile-nav button{font-size:14px;min-height:44px;padding:8px 10px}.mobile-layout .mobile-view-switch button{flex:1;border-color:transparent;background:transparent}.mobile-layout .mobile-view-switch button.active{background:#213c40;color:#a2f0df}.mobile-layout .workspace,.mobile-layout.us-expanded .workspace{display:grid;grid-template-columns:minmax(0,1fr);gap:12px}.mobile-layout .anatomy,.mobile-layout .ultrasound{grid-column:1;grid-row:1;display:block}.mobile-layout .ecg-panel{grid-column:1;grid-row:2}.mobile-layout .viewport,.mobile-layout.us-expanded .ultrasound .viewport{height:clamp(290px,52svh,540px);min-height:0;max-height:none}.mobile-layout .panelhead{flex-wrap:wrap;align-items:center;padding:10px 12px;gap:6px 12px}.mobile-layout .panelhead h2{font-size:12px;flex:1 1 180px}.mobile-layout .panelhead h2 span{font-size:14px;margin-left:7px;white-space:normal}.mobile-layout #enlarge-us{display:none}.mobile-layout .panel-actions{gap:8px}.mobile-layout .panelbottom{padding:8px 12px;gap:6px 12px;flex-wrap:wrap;font-size:14px}.mobile-layout .panelbottom label{min-height:44px}.mobile-layout input[type=checkbox]{flex:0 0 20px;width:20px;height:20px}.mobile-layout .panelbottom .quiet{display:block;font-size:12px;line-height:1.4}.mobile-layout .audio-controls{padding:10px 12px;gap:10px 16px;align-items:center}.mobile-layout .audio-toggle{flex:1 1 175px}.mobile-layout .audio-toggle button{font-size:13px;min-height:44px}.mobile-layout .audio-volume{flex:1 1 100px;max-width:180px}.mobile-layout .audio-volume input{height:32px;margin:0}.mobile-layout .scanmeta{left:12px;right:12px;top:12px;font-size:11px;gap:8px}.mobile-layout .scanmeta #preset-label{max-width:55%}.mobile-layout #image-settings{text-align:right}.mobile-layout .scanfooter{left:12px;right:12px;font-size:10px;gap:8px}.mobile-layout #timing{white-space:nowrap}.mobile-layout .ecg-panel canvas{height:150px}.mobile-layout .ecg-panel .panelhead>.quiet{max-width:none;text-align:left;font-size:12px;line-height:1.4;flex:1 1 220px}.mobile-layout .ecg-status{padding:10px 12px;font-size:12px;gap:8px;line-height:1.4}.mobile-layout .ecg-status .quiet{font-size:12px}.mobile-layout .physiology-legend{font-size:11px;bottom:48px}.mobile-layout #loading{padding:20px;overflow:auto}.mobile-layout #loading strong{font-size:17px}.mobile-layout #loading span{font-size:13px;line-height:1.45}.mobile-layout footer{display:block;padding-bottom:max(20px,env(safe-area-inset-bottom,0px));font-size:12px}.mobile-layout footer span{display:block;margin:5px 0}.mobile-layout dialog{max-height:90vh;max-height:90dvh}.mobile-layout .controls-dialog{max-height:78vh;max-height:78dvh}.mobile-layout #method-dialog{width:calc(100% - 20px);padding:18px}.mobile-layout #method-dialog h2{font-size:18px}.mobile-layout #method-content{font-size:15px}.mobile-layout #method-content th,.mobile-layout #method-content td{font-size:13px;padding-right:8px}
@media(max-width:520px){.controls-dialog fieldset{grid-template-columns:minmax(0,1fr)!important}.controls-dialog .control-section{border-right:0}.mobile-layout .audio-volume{max-width:none}.mobile-layout .toolbar p{max-width:36ch}}
@media(pointer:coarse){button,select{min-height:44px}input[type=range]{height:36px}select{font-size:16px}.range-row label{line-height:1.4}.check-row{min-height:44px}}
@media(max-height:500px) and (pointer:coarse){.mobile-layout .toolbar h1,.mobile-layout .toolbar p{display:none}.mobile-layout .topbar{min-height:46px;padding-top:8px;padding-bottom:8px}.mobile-layout .toolbar{margin-bottom:4px}.mobile-layout .actions{margin-top:0;grid-template-columns:repeat(5,minmax(0,1fr))}.mobile-layout .actions .review-link:first-of-type{grid-column:auto}.mobile-layout .viewport{height:72svh}.mobile-layout .mobile-nav{padding:6px 0}.mobile-layout .controls-dialog{max-height:88dvh}}

.touch-probe{display:none}@media(any-pointer:coarse){.touch-probe{display:block;font-size:13px;min-height:44px}}.mobile-layout .topbar{padding-top:max(12px,env(safe-area-inset-top,0px))}.mobile-layout .mobile-nav{top:env(safe-area-inset-top,0px)}

/* Learning stays next to the anatomy; the existing mobile view switch is kept. */
.learning-panel{border-top:1px solid var(--edge);padding:16px;background:#101b24;font-size:15px;line-height:1.5}.learning-tabs{display:flex;gap:8px}.learning-tabs button{flex:1;font-size:14px;min-height:44px}.learning-tabs [aria-pressed=true]{background:#254840;color:#b8ffe9;border-color:#598b7e}.learning-panel h3{font-size:17px;margin:8px 0}.learning-panel p{margin:8px 0}.learning-panel .small{font-size:13px;line-height:1.5}.learning-filters{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:12px 0}.learning-panel label{display:block;font-size:14px;color:#b4c8d3}.learning-panel select,.learning-panel input[type=search]{display:block;width:100%;min-height:44px;font:inherit;color:#e2eef3;background:#0c141c;border:1px solid #354b59;border-radius:6px;padding:9px 10px;margin-top:5px}.structure-results{max-height:166px;overflow:auto;overscroll-behavior:contain;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:5px;margin-top:9px;padding:2px}.structure-results button{text-align:left;white-space:normal;font-size:14px;padding:9px 10px;min-height:44px;background:#15232e;border-color:#2b414f}.structure-results button[aria-pressed=true]{border-color:#68d5b5;background:#1e3d37}.structure-results p{grid-column:1/-1}.structure-card{border-top:1px solid #354953;margin-top:14px;padding-top:9px}.structure-actions{display:flex;flex-wrap:wrap;gap:7px;margin:12px 0}.structure-actions button{font-size:14px;min-height:44px;padding:8px 11px}.structure-actions [aria-pressed=true]{background:#284c43;border-color:#75b49f}.structure-review{border-left:3px solid #d7ac64;padding-left:10px;color:#edd0a0;font-size:14px}.structure-pins{display:flex;flex-wrap:wrap;gap:6px}.structure-pins button{font-size:13px;min-height:40px;white-space:normal;text-align:left}.structure-choice{padding:10px 0;border-top:1px solid #3d535d}.structure-choice-options{display:flex;flex-wrap:wrap}.structure-choice button{margin:3px;font-size:14px;min-height:44px}.learning-references{font-size:13px;color:#adbec8;margin-top:15px}.learning-references summary{cursor:pointer;min-height:32px}.learning-references a{display:block;color:#91d8cc;margin:6px 0}.learning-help{color:#a8b9c4}.quiz-options{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:12px 0}.quiz-options button{text-align:left;white-space:normal;min-height:48px;font-size:14px;line-height:1.4}.quiz-options button:disabled{opacity:.75}#quiz-feedback{color:#c0e9df;min-height:24px}#quiz-progress{font-variant-numeric:tabular-nums}.structure-labels,.structure-leaders{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;overflow:hidden}.structure-leaders line{stroke-width:1.2;opacity:.8}.structure-labels .structure-label{position:absolute;left:0;top:0;padding:6px 9px;min-height:32px;font-size:13px;line-height:1.3;white-space:normal;text-align:left;color:#eff6ff;background:#0c192de8;border:1px solid #668ede;border-radius:5px;pointer-events:auto;box-shadow:0 2px 9px #0008}.quiz-view-prompt{position:absolute;top:12px;left:12px;right:12px;width:fit-content;max-width:calc(100% - 24px);padding:8px 11px;background:#0c191be8;border:1px solid #426b61;border-radius:5px;color:#d1fff0;font-size:14px;line-height:1.4;pointer-events:none}.learning-panel button:focus-visible,.learning-panel input:focus-visible,.learning-panel select:focus-visible,.structure-label:focus-visible{outline:2px solid #a2f3d6;outline-offset:2px}.mobile-layout .learning-panel{padding:12px}.mobile-layout .structure-labels .structure-label{font-size:13px;min-height:44px}.mobile-layout .quiz-view-prompt{font-size:13px}.mobile-layout #learn-toggle{min-height:44px;font-size:14px}@media(max-width:520px){.learning-filters{grid-template-columns:1fr}.structure-results{max-height:152px;grid-template-columns:1fr}.quiz-options{grid-template-columns:1fr}.learning-panel .learning-tabs button{font-size:13px;padding:7px}.learning-panel .structure-actions button{flex:1 1 110px}}

#learn-toggle{font-size:14px;min-height:40px}.anatomy .panelhead{flex-wrap:wrap}.anatomy .panel-actions{flex-wrap:wrap}.learning-open #learning-panel{max-height:540px;overflow-y:auto;overscroll-behavior:contain}.mobile-layout.learning-open .anatomy .viewport{height:38svh;min-height:230px;max-height:380px}.mobile-layout.learning-open #learning-panel{max-height:48svh;min-height:240px}.mobile-layout.learning-open #anatomy-panel{scroll-margin-top:80px}

/* ECG and both imaging panels occupy the top of the learning workspace. */
.ecg-panel{grid-column:1/3;grid-row:1}.anatomy,.ultrasound{grid-row:2}.controls{grid-row:1/span 3}.learning-panel{grid-column:1/3;grid-row:3}.ecg-panel .panelhead{min-height:36px;padding:7px 14px}.ecg-panel canvas{height:112px}.ecg-status{padding:6px 14px;font-size:12px;min-height:32px}.ecg-panel .quiet{font-size:12px}.viewport{height:clamp(230px,calc(100svh - 480px),600px)}.sound-section .audio-controls{border:0;padding:0;display:block}.sound-section .audio-volume{margin-top:12px;max-width:none}.learning-open #learning-panel{max-height:none;overflow:visible}.us-learning-modes{display:flex;gap:8px;flex-wrap:wrap}.us-learning-modes button{flex:1;min-height:44px;font-size:14px}.us-learning-modes [aria-pressed=true]{border-color:#7ab8ff;background:#203e62;color:#c6e4ff}.us-learning-options{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin:12px 0}.us-learning-options label{display:flex;gap:6px;align-items:center}.us-learning-options button{font-size:14px;min-height:44px}#us-learning-controls{padding-bottom:16px;margin-bottom:16px;border-bottom:1px solid #354b5e}#us-learning-status{color:#bddcff}#us-hide.active{border-color:#a4cdff}.us-labels{position:absolute;inset:0;pointer-events:none;overflow:hidden}.us-labels button{position:absolute;padding:4px 7px;min-height:30px;max-width:165px;font-size:13px;line-height:1.25;background:#0b172be8;border:1px solid #70baff;pointer-events:auto;white-space:normal;text-align:left}.us-labels svg{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}.us-labels line{stroke:#89c9ff;stroke-width:1.2}.scan-point{position:absolute;width:14px;height:14px;border:2px solid #69b8ff;border-radius:50%;box-shadow:0 0 0 2px #081827;pointer-events:none;transform:translate(-50%,-50%)}.scan-point:before,.scan-point:after{content:'';position:absolute;background:#afd7ff}.scan-point:before{width:22px;height:1px;left:-6px;top:5px}.scan-point:after{width:1px;height:22px;left:5px;top:-6px}.us-expanded .ecg-panel{grid-column:1;grid-row:1}.us-expanded .ultrasound{grid-row:2}.us-expanded .learning-panel{grid-column:1;grid-row:3}.us-expanded .controls{grid-row:1/span 3}.us-expanded .ultrasound .viewport{height:clamp(230px,calc(100svh - 480px),700px);min-height:230px}
@media(max-width:1180px){.controls{grid-column:1/-1;grid-row:4}.learning-panel{grid-column:1/-1;grid-row:3}.ecg-panel{grid-column:1/-1;grid-row:1}}
.mobile-layout .ecg-panel,.mobile-layout.us-expanded .ecg-panel{grid-column:1/-1;grid-row:1}.mobile-layout .ecg-panel canvas{height:104px}.mobile-layout .ecg-panel .panelhead{padding:7px 10px;min-height:34px}.mobile-layout .ecg-panel .panelhead>.quiet{display:none}.mobile-layout .ecg-status{padding:5px 10px;font-size:12px}.mobile-layout .ecg-status>.quiet,.mobile-layout #flow-status{display:none}.mobile-layout .anatomy,.mobile-layout .ultrasound{grid-row:2}.mobile-layout .learning-panel{grid-column:1/-1;grid-row:3}.mobile-layout.learning-open #learning-panel{max-height:none;min-height:0}.mobile-layout .viewport,.mobile-layout.learning-open .anatomy .viewport{height:clamp(240px,calc(100svh - 450px),430px)}.mobile-layout .controls{grid-row:4}.mobile-layout .us-labels button{font-size:12px;max-width:140px;min-height:36px}.mobile-layout .mobile-view-switch button{font-size:12px;padding:6px}.mobile-layout.compare-layout .workspace{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.mobile-layout.compare-layout .anatomy{grid-column:1}.mobile-layout.compare-layout .ultrasound{grid-column:2}.mobile-layout.compare-layout .viewport{height:clamp(220px,38svh,420px)}.mobile-layout.compare-layout .panelhead{padding:8px;min-height:80px;align-content:center}.mobile-layout.compare-layout .panelhead .quiet,.mobile-layout.compare-layout #model-timing,.mobile-layout.compare-layout .scanmeta,.mobile-layout.compare-layout .scanfooter,.mobile-layout.compare-layout .viewhint{display:none}.mobile-layout.compare-layout .panelhead h2{flex-basis:100%}.mobile-layout.compare-layout .panel-actions{gap:4px}.mobile-layout.compare-layout .panelbottom{font-size:12px;padding:6px;gap:0}.mobile-layout.compare-layout .panelbottom .key,.mobile-layout.compare-layout .panelbottom .quiet,.mobile-layout.compare-layout #touch-probe{display:none}.mobile-layout.compare-layout .zoom-controls{right:7px;bottom:12px}.mobile-layout.compare-layout .zoom-controls button{width:36px;height:36px}.mobile-layout.compare-layout .ecg-panel .panelhead{min-height:34px}.mobile-layout.compare-layout .us-labels button{max-width:100px;font-size:11px}.mobile-layout.compare-layout .structure-labels .structure-label{max-width:110px!important;font-size:12px}

.ultrasound .panelhead,.ultrasound .panel-actions{flex-wrap:wrap}#us-learn-toggle{font-size:14px;min-height:40px}.us-labels button:focus-visible{outline:2px solid #bdddff;outline-offset:2px}.mobile-layout.compare-layout #learn-toggle,.mobile-layout.compare-layout #us-learn-toggle{font-size:12px;padding:6px;min-height:44px}.mobile-layout.compare-layout .physiology-legend{display:none}

/* The scan and anatomy stay adjacent; the ECG sits immediately below them. */
.topbar{height:60px}main{padding-top:16px}.toolbar{margin-bottom:16px}.toolbar h1{font-size:24px}.toolbar p{font-size:14px}.workspace{row-gap:8px;grid-template-rows:min-content min-content auto}.anatomy,.ultrasound{grid-row:1;display:flex;flex-direction:column;align-self:stretch}.ecg-panel{grid-row:2}.learning-panel{grid-row:3;margin-top:8px}.controls{grid-row:1/span 3;max-height:calc(100svh - 150px);overflow:auto;overscroll-behavior:contain;position:sticky;top:12px}.anatomy .panelhead,.ultrasound .panelhead{min-height:88px;align-content:center;gap:6px;padding:8px 14px;flex-wrap:wrap}.anatomy .panelhead h2,.ultrasound .panelhead h2{flex-basis:100%}.anatomy .panel-actions,.ultrasound .panel-actions{width:100%;justify-content:flex-end;flex-wrap:nowrap}.anatomy .panel-actions .quiet:first-child{margin-right:auto}.viewport{height:clamp(240px,calc(100svh - 470px),620px)}.anatomy .panelbottom,.ultrasound .panelbottom{min-height:64px;margin-top:auto;padding:8px 14px;gap:6px 10px}.anatomy .panelbottom{justify-content:flex-start}.ecg-panel .panelhead{min-height:30px;padding:5px 14px}.ecg-panel canvas{height:100px}.ecg-status{min-height:26px;padding:5px 14px;gap:6px}.us-expanded .ultrasound{grid-row:1}.us-expanded .ecg-panel{grid-row:2}.us-expanded .ultrasound .viewport{height:clamp(240px,calc(100svh - 470px),620px)}.us-expanded .controls{grid-row:1/span 3}
.scan-structures{padding:12px 0;border-bottom:1px solid #304353;margin-bottom:12px}.scan-structures-heading{display:flex;justify-content:space-between;gap:10px;align-items:center}.scan-structures-heading h3{font-size:15px;margin:0}.scan-structure-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:6px;max-height:172px;overflow-y:auto;margin-top:8px;padding:2px}.scan-structure-list button{text-align:left;font-size:14px;min-height:44px;padding:7px 10px;white-space:normal;display:flex;justify-content:space-between;gap:8px;align-items:center}.scan-structure-list button[aria-pressed=true]{background:#203f61;border-color:#87c4ff}.scan-structure-list button small{font-size:12px;color:#9daebc;white-space:nowrap}.scan-structure-list p{grid-column:1/-1}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.us-labels button{min-height:36px;font-size:14px;max-width:154px;text-wrap:balance;transition:opacity .12s}.us-labels button[data-selected=true]{background:#143458;border-color:#b1dbff;color:#fff}.us-labels line{opacity:.7;stroke-width:1}.us-labels circle{fill:#9ad1ff;stroke:#081323;stroke-width:1.5}
@media(max-width:1180px){.controls{position:static;max-height:none;overflow:visible;grid-row:4}.us-expanded .controls{max-height:calc(100svh - 150px);overflow:auto}.scan-structure-list{grid-template-columns:repeat(2,minmax(0,1fr))}}
.mobile-layout .anatomy,.mobile-layout .ultrasound{grid-row:1}.mobile-layout .ecg-panel,.mobile-layout.us-expanded .ecg-panel{grid-row:2}.mobile-layout .workspace{row-gap:8px}.mobile-layout .controls{position:static;max-height:none;overflow:visible}.mobile-layout .viewport,.mobile-layout.learning-open .anatomy .viewport{height:clamp(230px,calc(100svh - 390px),440px)}.mobile-layout .ecg-panel canvas{height:100px}.mobile-layout .ecg-panel .panelhead{min-height:30px}.mobile-layout .toolbar h1{font-size:21px}.mobile-layout .toolbar p{font-size:13px}.mobile-layout .scan-structure-list{grid-template-columns:1fr}.mobile-layout .us-labels button{font-size:14px;min-height:44px}.mobile-layout.compare-layout .viewport{height:clamp(220px,34svh,370px)}.mobile-layout.compare-layout .anatomy .panelhead,.mobile-layout.compare-layout .ultrasound .panelhead{min-height:90px}.mobile-layout.compare-layout .panel-actions{justify-content:flex-start}.mobile-layout.compare-layout .panelbottom{min-height:52px}.mobile-layout.compare-layout .us-labels button{font-size:12px;max-width:105px;min-height:36px}.mobile-layout .mobile-nav{gap:6px}.mobile-layout #open-controls{padding:8px}.mobile-layout .controls-dialog .controls{max-height:none}

@media(max-width:520px){.mobile-layout .toolbar p,.mobile-layout .actions .review-link{display:none}.mobile-layout main{padding-top:12px}.mobile-layout .actions{margin-top:8px}.mobile-layout .mobile-nav{padding:6px 0}.mobile-layout .anatomy .panelhead,.mobile-layout .ultrasound .panelhead{min-height:78px}.mobile-layout .viewport,.mobile-layout.learning-open .anatomy .viewport{height:clamp(230px,calc(100svh - 600px),340px)}.mobile-layout .anatomy .panelbottom,.mobile-layout .ultrasound .panelbottom{min-height:50px}.mobile-layout.compare-layout .viewport{height:clamp(220px,30svh,300px)}}

.mobile-layout .actions .review-link{display:none}.mobile-layout.compare-layout .anatomy .viewport{height:clamp(220px,34svh,370px)}
@media(max-width:520px){.mobile-layout.compare-layout .anatomy .viewport{height:clamp(220px,30svh,300px)}}

@media(min-width:700px){.mobile-layout .toolbar{display:flex;gap:16px;align-items:center}.mobile-layout .actions{margin-top:0;flex:0 0 330px}}

/* Labels keep their DOM identity; text and leaders fade as one callout. */
.structure-labels .label-fade,.us-labels .label-fade,.structure-leaders .label-fade{transition:opacity 160ms ease-out}
.structure-labels .structure-label[data-selected=true]{background:#133757;border-color:#b2dfff;box-shadow:0 2px 12px #0008,inset 3px 0 #8dcaff}
.structure-labels .structure-label{font-size:14px;line-height:1.35;border-radius:7px;min-height:36px}.us-labels button{border-radius:7px;line-height:1.35}
#structure-choice{position:absolute;z-index:4;top:12px;bottom:auto;left:12px;right:12px;margin:0;padding:9px 12px;border:1px solid #557b9d;border-radius:8px;background:#0c192df5;box-shadow:0 4px 18px #0008;font-size:14px;line-height:1.4;max-height:48%;overflow:auto;overscroll-behavior:contain}
#structure-choice details{margin-right:34px}#structure-choice summary{min-height:36px;cursor:pointer;display:list-item;padding:8px 0;color:#c0e0ff}#structure-choice-close{position:absolute;right:5px;top:5px;width:36px;height:36px;min-height:36px;padding:0;font-size:22px;border:0;background:transparent}
#structure-choice-options{display:flex;flex-wrap:wrap;gap:6px;padding:6px 0}#structure-choice-options button{font-size:14px;line-height:1.3;text-align:left;white-space:normal;min-height:40px;padding:7px 10px}#structure-choice-options [aria-pressed=true]{border-color:#a4d6ff;background:#1b4164}
.mobile-layout #structure-choice{top:8px;bottom:auto;left:6px;right:6px;font-size:14px;max-height:55%}.mobile-layout #structure-choice-options button{min-height:44px}.mobile-layout #structure-choice-close{width:44px;height:44px}.mobile-layout #structure-choice summary{padding-right:8px;min-height:44px}
@media(prefers-reduced-motion:reduce){.structure-labels .label-fade,.us-labels .label-fade,.structure-leaders .label-fade{transition:none}}

/* One ECG height in every layout; the renderer uses a fixed gain and sweep. */
.ecg-panel canvas,.mobile-layout .ecg-panel canvas{height:150px}