:root{color-scheme:dark;--bg:#0a121b;--panel:#111e2a;--border:#253541;--text:#edf3f8;--muted:#9bafbf;--aqua:#67e3ce;--coral:#ff816e}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}button,select,input{font:inherit}button,select{cursor:pointer}button{color:inherit;border:1px solid var(--border);background:transparent;padding:9px 14px;border-radius:7px}button:hover{background:#253b47}button:focus-visible,select:focus-visible,input:focus-visible,a:focus-visible,summary:focus-visible{outline:2px solid var(--aqua);outline-offset:4px}header{height:82px;padding:0 4%;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between}.brand{color:var(--text);font-size:24px;text-decoration:none;font-weight:650;display:flex;align-items:center;gap:12px}.brandmark{font-size:35px;color:var(--aqua)}.lab{font-size:12px;font-weight:500;letter-spacing:2px;border-left:1px solid #405261;padding-left:18px;margin-left:12px}.author{font-size:14px}.muted{color:var(--muted)}main{max-width:1560px;padding:36px 4% 0;margin:auto}.heading{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:26px}.eyebrow{font-size:12px;letter-spacing:1.7px;color:var(--aqua);font-weight:600}h1{font-weight:550;font-size:clamp(26px,2.6vw,38px);letter-spacing:-1px;margin:8px 0}p{margin:7px 0;color:var(--muted)}.badge{font-size:13px;border:1px solid #355048;border-radius:30px;color:var(--aqua);padding:8px 13px;white-space:nowrap}.toolbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px;gap:16px}.segmented{display:inline-flex;background:#0b1520;padding:4px;border:1px solid var(--border);border-radius:9px}.segmented button{border:0;font-size:14px}.segmented .selected{background:#24443f;color:#acffe8}.case-label{font-size:14px;color:var(--muted);display:flex;align-items:center;gap:12px}select{background:#162632;border:1px solid #3c5262;color:var(--text);border-radius:6px;padding:10px 30px 10px 12px;max-width:100%}.workspace{display:grid;grid-template-columns:1.08fr 1fr;gap:22px}.panel{background:var(--panel);border:1px solid var(--border);border-radius:13px;overflow:hidden}.panel-head{padding:20px 22px;display:flex;align-items:center;justify-content:space-between;gap:12px}.panel-head>div{display:flex;gap:12px;align-items:center}h2{font-size:18px;font-weight:550;margin:0}h3{font-weight:550;font-size:20px;margin:8px 0}.step{font-size:12px;color:var(--aqua);font-variant-numeric:tabular-nums;border:1px solid #35574f;padding:3px 7px;border-radius:5px}.small{font-size:12px;letter-spacing:1px}.ecg-panel{position:relative}.ecg-wrap{margin:0 20px;border-radius:7px;overflow:hidden;background:#f4eee7}canvas{display:block;width:100%}#ecg{aspect-ratio:16/9}.ecg-meta{display:flex;justify-content:space-between;margin:9px 22px;font:12px ui-monospace,monospace;color:var(--muted)}.lead-pills{display:flex;gap:8px;margin:18px 22px}.lead-pills button{font-size:13px;padding:5px 13px;color:var(--muted)}.lead-pills .active{color:#ffc4b8;background:#432b2c;border-color:#61413c}.interpretation{padding:0 22px 22px;min-height:105px}.interpretation strong{color:var(--text);font-weight:550}.interpretation p{font-size:14px}.reveal-cover{position:absolute;inset:72px 0 0;background:#111e2af7;z-index:3;text-align:center;padding:80px 30px}.reveal-cover[hidden]{display:none}.reveal-cover .primary{margin-top:20px}#heartStage{height:352px;position:relative;background:radial-gradient(ellipse at center,#233645 0,#0d1923 72%);overflow:hidden}#heartStage canvas{touch-action:none;height:100%}.model-tag{position:absolute;left:20px;top:14px;font-size:12px;z-index:1;pointer-events:none}.model-label{position:absolute;right:15%;top:37%;font-size:13px;color:var(--aqua);border-bottom:1px solid currentColor;padding:4px;pointer-events:none}.territory-label{top:74%;left:17%;right:auto;color:var(--coral)}.model-controls{display:flex;gap:8px;padding:15px 18px 8px;align-items:center;flex-wrap:wrap}.compact button{font-size:12px;padding:7px 9px}.subtle{font-size:12px;padding:7px 9px}.legend{display:flex;gap:18px;padding:7px 22px;font-size:12px;color:var(--muted);flex-wrap:wrap}.dot{display:inline-block;width:8px;height:8px;border-radius:50%;margin-right:5px}.coral{background:var(--coral)}.aqua{background:var(--aqua)}.model-caption{padding:5px 22px;font-size:14px}.hint{font-size:12px;padding:0 22px 16px;color:#7e96aa}.echo-panel{margin-top:22px}.echo-toolbar{display:flex;align-items:center;justify-content:space-between;padding:0 22px 20px;gap:12px}.view-tabs{display:flex;gap:7px;flex-wrap:wrap}.view-tabs button{font-size:14px;border-color:transparent}.view-tabs button[aria-selected=true]{border-color:#4b7771;background:#1c3837;color:var(--aqua)}.view-tabs span{color:var(--aqua)}.check{font-size:14px;white-space:nowrap;display:flex;align-items:center;gap:8px}input[type=checkbox]{accent-color:var(--aqua);width:17px;height:17px}.echo-grid{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--border)}.echo-screen{position:relative;background:#010508;padding:20px 20px 8px}.screen-label{font:12px ui-monospace,monospace;letter-spacing:1px;color:var(--muted);display:flex;justify-content:space-between}.screen-label span{color:var(--text);letter-spacing:0}.abnormal .screen-label span{color:var(--coral)}.echo-screen canvas{aspect-ratio:720/500;max-height:380px;object-fit:contain}.sim-label{position:absolute;bottom:14px;left:20px;color:#79909f;font:11px ui-monospace,monospace;letter-spacing:1px}.playback{display:flex;align-items:center;gap:20px;padding:18px 22px;border-bottom:1px solid var(--border)}.primary{background:var(--aqua);color:#0b2926;border:0;font-weight:600;font-size:14px}.primary:hover{background:#a2f5e7}input[type=range]{accent-color:var(--aqua);flex:1;min-width:60px}#time{font:12px ui-monospace,monospace;color:var(--muted);white-space:nowrap}.speed-label{font-size:13px;display:flex;gap:8px;align-items:center}.speed-label select{padding:7px}.echo-notes{display:grid;grid-template-columns:1.5fr 1fr;gap:40px;padding:26px}.echo-notes p{font-size:15px}.echo-notes aside{border-left:1px solid var(--border);padding-left:28px}.text-button{border:0;padding:12px 0;color:var(--aqua);font-size:14px}.bottom-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin:22px 0}.teaching{padding:26px}.teaching h2{margin:8px 0 16px;font-size:22px}.teaching p,.teaching li{font-size:15px}.teaching ul{margin:0;padding-left:18px;color:var(--muted)}li{padding-bottom:9px}.flow{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin:18px 0}.flow span{padding:10px;background:#182c37;border-radius:6px;font-size:14px}.flow b{color:var(--aqua)}.sources{padding:18px 22px;border:1px solid var(--border);border-radius:8px;color:var(--muted);font-size:14px}.sources summary{cursor:pointer;color:var(--text);font-size:15px}.sources p{margin:15px 0}a{color:var(--aqua)}footer{display:flex;justify-content:space-between;gap:20px;padding:30px 0;font-size:12px;color:var(--muted)}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}#heartFallback{padding:100px 30px 20px;font-size:16px}body.echo-first #echoSection{outline:1px solid #517e75}@media(min-width:1500px){#heartStage{height:390px}}@media(max-width:1000px){.workspace{grid-template-columns:1fr 1fr}.panel-head{align-items:flex-start}.panel-head .small{display:none}.toolbar{align-items:flex-start}.case-label{flex-direction:column;align-items:flex-start}.lab{display:none}.author{font-size:12px}.echo-toolbar{align-items:flex-start;flex-direction:column}.model-controls{gap:4px}}@media(max-width:760px){header{height:66px}.brand{font-size:20px}.author{font-size:14px}main{padding:24px 4% 0}.heading{display:block}.heading .badge{display:inline-block;margin-top:15px}h1{letter-spacing:-.5px}.toolbar{flex-direction:column}.case-label{width:100%}.case-label select{width:100%}.workspace,.echo-grid,.bottom-grid,.echo-notes{grid-template-columns:1fr}.panel-head{padding:18px}.echo-notes{gap:22px;padding:22px}.echo-notes aside{border-left:0;border-top:1px solid var(--border);padding:20px 0 0}.playback{gap:10px;flex-wrap:wrap}.playback input{order:4;flex-basis:100%}.speed-label{margin-left:auto}#heartStage{height:380px}.screen-label{font-size:11px}.echo-screen canvas{max-height:340px}footer{display:block}footer span{display:block;margin:7px 0}.lead-pills{gap:6px}.lead-pills button{padding:6px 12px}}

.toolbar{flex-wrap:wrap}.toolbar-instruction{flex:1 1 260px;margin:0;font-size:16px}.case-label{max-width:100%}

.echo-style-bar{display:flex;align-items:center;gap:16px;flex-wrap:wrap;padding:0 22px 20px}.echo-style-bar p{font-size:14px;flex:1 1 230px;margin:0}.echo-style-bar .segmented{flex-shrink:0}.echo-style-bar label{font-size:14px;display:flex;align-items:center;gap:9px}.echo-style-bar label[hidden]{display:none}.echo-style-bar input{width:90px}.echo-style-bar output{font:13px ui-monospace,monospace;width:23px}.echo-screen .sim-label{font-size:10px;letter-spacing:.6px}@media(max-width:760px){.echo-style-bar{padding:0 18px 20px}.echo-style-bar .segmented{width:100%}.echo-style-bar .segmented button{flex:1;padding:9px 7px;font-size:13px}.echo-style-bar p{flex-basis:100%}}

.plax-reference-note{margin:20px 24px 0;padding:14px 16px;border-left:2px solid #517e75;background:#152630;color:var(--muted);font-size:14px;line-height:1.65}.plax-reference-note[hidden]{display:none}.plax-reference-note strong{color:var(--text);font-weight:500}.plax-reference-note span{display:block;margin-top:6px}

/* Coronary anatomy explorer */
.heart-layer-bar{display:flex;gap:5px;padding:0 18px 16px;flex-wrap:wrap}.heart-layer-bar button{font-size:14px;padding:8px 10px}.heart-layer-bar .selected{background:#24443f;color:#acffe8;border-color:#486e65}#heartStage{height:510px;background:radial-gradient(ellipse at 45% 42%,#26313d 0,#111e2a 48%,#07111c 100%)}.model-tag{font-size:13px}.heart-pin{position:absolute;z-index:3;background:#091622de;padding:3px 5px;border-radius:3px;font-size:12px;line-height:1.3;color:#f0e6d9;white-space:nowrap;pointer-events:none}.heart-leader{position:absolute;height:1px;background:#e5d4b6a0;transform-origin:left center;pointer-events:none;z-index:2}.heart-leader::after{content:'';position:absolute;right:-2px;top:-2px;width:5px;height:5px;background:#ffe5b8;border-radius:50%}.heart-pin[hidden],.heart-leader[hidden]{display:none}.model-controls .check{margin-left:auto}.model-controls .subtle,.compact button{font-size:14px}.heart-expanded{position:fixed;inset:16px;z-index:50;overflow:auto;background:#101d2a;box-shadow:0 0 0 30px #030810d9}.heart-expanded #heartStage{height:calc(100dvh - 290px);min-height:360px}.heart-expanded .heart-pin{font-size:14px}.heart-expanded .panel-head{padding:12px 22px}.heart-expanded .model-caption,.heart-expanded .hint{margin:2px 0}.heart-is-expanded{overflow:hidden}.heart-expanded .heart-layer-bar{padding-bottom:8px}@media(max-width:760px){#heartStage{height:480px}.heart-expanded{inset:5px}.heart-expanded #heartStage{height:55dvh;min-height:320px}.heart-layer-bar button{flex:1;padding:8px 6px}.heart-pin{font-size:12px}.model-controls{padding:12px;gap:6px}.model-controls .check{margin-left:0}}

.teaching-intro{padding:0 22px 22px;display:flex;gap:16px;flex-wrap:wrap;color:var(--muted)}.teaching-intro strong{color:var(--aqua)}.study-controls{display:flex;align-items:center;gap:12px;flex-wrap:wrap;padding:18px 22px;border-bottom:1px solid var(--border)}.study-controls button{font-size:14px}.study-controls #phaseLabel{color:var(--aqua);font-size:14px}.study-controls .check{margin-left:auto}.landmark-explorer{padding:22px;background:#0d1924}#landmarkButtons{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}#landmarkButtons button{font-size:14px;padding:7px 12px}#landmarkButtons button[aria-pressed=true]{background:#e9bd75;color:#11202a;border-color:#e9bd75}.landmark-explorer .hint{padding:0;margin-top:15px}.echo-screen canvas{max-height:440px}.sim-label{position:static;display:block;font-size:12px;margin-top:12px}.screen-label{flex-wrap:wrap;gap:6px}@media(max-width:760px){.study-controls .check{margin-left:0}.teaching-intro{gap:6px}}

.case-summary{margin:0 0 16px;color:var(--aqua);font-weight:600}.lead-pills{flex-wrap:wrap}.lead-pills button[aria-pressed=true]{outline:2px solid var(--aqua);outline-offset:2px}.extra-ecg{margin:0 22px 22px}.extra-ecg h3{font-size:16px}.extra-ecg canvas{border-radius:6px}.extra-ecg p{font-size:13px;margin-top:10px}.global-control{display:flex;gap:14px;align-items:center;padding:0 22px 20px;color:var(--muted);flex-wrap:wrap}.global-control[hidden],.extra-ecg[hidden]{display:none}.case-label select{max-width:min(480px,80vw)}

.screen-label{min-height:44px;align-content:flex-start}.screen-label span{max-width:100%;overflow-wrap:anywhere}

.site-footer{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:18px 28px;border-top:1px solid var(--border);margin-top:26px;padding:26px 0;font-size:13px}.footer-lab{color:var(--text);font-weight:600;letter-spacing:.5px}.footer-contact{display:flex;align-items:center;flex-wrap:wrap;gap:10px}.footer-contact a{display:inline-flex;align-items:center;gap:8px;text-decoration:none}.footer-contact a:hover{text-decoration:underline}.linkedin-icon{width:21px;height:21px;flex-shrink:0}.site-footer span{display:inline;margin:0}@media(max-width:760px){.site-footer{align-items:flex-start;flex-direction:column;gap:14px}.footer-contact{gap:8px}}

.heading-description{display:block;max-width:660px;margin-top:12px;font-size:18px;font-weight:400;line-height:1.55;letter-spacing:0;color:var(--muted,#a9bdc9)}
.brand .brand-logo{width:46px;height:46px;object-fit:contain;flex:none}.brand{gap:10px}@media(max-width:760px){.brand .brand-logo{width:36px;height:36px}.heading-description{font-size:16px}}

/* Focused teaching interface */
:root{--bg:#0B1420;--panel:#142332;--border:#304656;--text:#F2F6FA;--muted:#B4C3CF;--aqua:#38C6BC;--coral:#E77D73;--amber:#F3B65B}
[hidden]{display:none!important}main{max-width:1440px;padding-top:26px}header{height:72px}.heading{margin-bottom:20px}h1{font-size:clamp(28px,3vw,36px);margin:0 0 6px}.subtitle{font-size:17px}.badge{color:#71e2d7;border-color:#47766f}.toolbar{margin-bottom:8px}.case-label{font-size:16px;flex-direction:row;align-items:center;width:100%;gap:18px}.case-label select{max-width:100%;width:min(640px,100%);font-size:17px;font-weight:550;background:#1c3242;padding:12px 34px 12px 14px;border-color:#77909f}.artery-intro{font-size:14px;line-height:1.65;margin:10px 0 20px;max-width:1050px;color:var(--muted)}.workspace{grid-template-columns:1fr 1fr;align-items:start;gap:18px}.panel{min-width:0}.panel-head{padding:16px 20px}.panel-head>div{min-width:0}h2{font-size:20px;font-weight:600}.small{font-size:13px}.step{color:#70e0d6;border-color:#567e84}.ecg-meta{font-size:13px;flex-wrap:wrap;gap:6px}.lead-pills{margin:14px 20px;gap:6px}.lead-pills button{color:var(--text);font-size:14px;padding:6px 10px}.lead-pills .active{background:#432e35;color:#ffd0c7;border-color:#b06e68}.interpretation{min-height:0;padding:0 20px 16px}.interpretation strong{font-size:17px}.extra-ecg p{font-size:14px}.disclosure{border-top:1px solid var(--border);color:var(--muted);font-size:15px}.disclosure summary{cursor:pointer;color:var(--text);padding:13px 20px;font-size:15px;font-weight:550;min-height:46px}.disclosure summary:hover{background:#1e3546}.disclosure[open]>summary{color:#78e5dc}.detail-body{padding:0 20px 18px;line-height:1.65}.detail-body p{font-size:15px;margin:8px 0}.detail-body ul{padding-left:20px;margin:8px 0}.detail-body h2{font-size:18px}.detail-body a{color:#75e3da;text-underline-offset:3px}.disclosure.help summary{font-size:14px}.model-caption,.hint{padding:0;font-size:14px;color:var(--muted)}#heartStage{height:clamp(330px,29vw,400px);background:radial-gradient(ellipse at 45% 42%,#293d4d,#10202f 70%)}.model-tag{font-size:13px;max-width:85%;color:var(--muted);left:16px;top:12px}.heart-layer-bar{padding:0 16px 12px;gap:6px}.heart-layer-bar button,.compact button,.subtle{font-size:14px}.heart-layer-bar .selected,.segmented .selected,.view-tabs button[aria-selected=true],#landmarkButtons button[aria-pressed=true]{color:#071d25;background:var(--aqua);border-color:var(--aqua);font-weight:600}.model-controls{padding:12px 16px 8px;gap:6px}.model-controls .check{margin-left:0}.legend{padding:8px 16px 14px;gap:8px 16px;font-size:14px}.dot{width:9px;height:9px}.amber{background:var(--amber)}.heart-pin{font-size:13px;color:var(--text);background:#0b1420ed}.local-caution{font-size:14px;color:#d3dee6;line-height:1.55}.anatomy-panel>.local-caution{margin:0 18px 12px;border-left:2px solid var(--amber);padding-left:10px}.echo-panel{margin-top:18px}.echo-toolbar{padding:0 20px 12px}.visual-note{padding:0 20px 12px;margin:0;font-size:14px}.view-tabs button{padding:8px 11px}.echo-screen{padding:16px 18px;background:#0b1723}.screen-label{font:600 16px/1.45 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;letter-spacing:0;min-height:52px;color:var(--text);gap:4px;flex-direction:column;justify-content:flex-start}.screen-label span{font-size:14px;font-weight:400}.abnormal .screen-label span{color:var(--amber)}.echo-screen canvas{max-height:400px}.playback{gap:16px;padding:14px 20px;flex-wrap:wrap}#time{font-size:14px}.primary{background:var(--aqua);color:#071d25;font-size:15px}.primary:hover{background:#69d9d0}.more-controls .detail-body{padding-top:4px}.study-controls{padding:14px 0;border:0}.study-controls #phaseLabel{color:#7ce6dc}.landmark-explorer{padding:8px 0 0;background:none}.landmark-explorer strong{font-size:15px}.landmark-explorer p{font-size:15px}.speed-label{font-size:15px}.connection{padding:18px 20px 0;border-top:1px solid var(--border)}.connection h3{font-size:18px;margin:0 0 8px}.connection>p{font-size:16px}.connection>.local-caution{font-size:14px;margin:10px 0 16px}.connection>.disclosure{margin:0 -20px}.bottom-grid{gap:18px;margin:18px 0}.bottom-grid .panel{align-self:start}.flow{margin:12px 0}.flow span{font-size:14px;background:#213746}.global-notice{font-size:14px;color:var(--muted);margin:16px 0}.about{border-bottom:1px solid var(--border)}.site-footer{margin-top:0;border-top:0;font-size:14px}.text-button{color:#75e3da}.check{font-size:14px}.segmented{max-width:100%;flex-wrap:wrap}button,summary,a,select,input{touch-action:manipulation}button{min-height:38px}button:focus-visible,select:focus-visible,input:focus-visible,a:focus-visible,summary:focus-visible,canvas:focus-visible{outline:3px solid #83f2e7;outline-offset:3px}.view-tabs button:hover,button:hover{border-color:#7892a4}.visual-expanded,.heart-expanded{position:fixed;inset:12px;z-index:50;overflow:auto;background:var(--panel);box-shadow:0 0 0 30px #030810e8;margin:0}.visual-is-expanded,.heart-is-expanded{overflow:hidden}.visual-expanded .ecg-wrap{max-width:1250px;margin:0 auto}.visual-expanded .extra-ecg{max-width:1250px;margin:16px auto}.visual-expanded .echo-screen canvas{max-height:70vh}.heart-expanded #heartStage{height:calc(100dvh - 270px);min-height:320px}.heart-expanded .panel-head{padding:12px 20px}.heart-expanded .legend{padding-bottom:8px}
@media(max-width:1000px){.case-label{flex-direction:row;align-items:center}.model-controls{gap:6px}.workspace{gap:16px}.echo-toolbar{gap:12px}.panel-head .small{display:block}}
@media(max-width:760px){main{padding:20px 4% 0}.heading .badge{margin-top:12px}.case-label{align-items:flex-start;flex-direction:column;gap:7px}.case-label select{max-width:100%;width:100%;font-size:16px}.artery-intro{font-size:14px}.workspace,.echo-grid,.bottom-grid{grid-template-columns:1fr}.panel-head{padding:14px 16px;align-items:center}.panel-head h2{font-size:19px}.panel-head>div{gap:8px}.panel-head button{font-size:13px;padding:7px 9px}.ecg-wrap{margin:0 12px}.ecg-meta{margin:9px 14px;font-size:12px}.lead-pills{margin:12px 14px}.interpretation{padding:0 16px 14px}.extra-ecg{margin:0 14px 16px}#heartStage{height:370px}.heart-layer-bar{padding:0 12px 12px}.heart-layer-bar button{font-size:13px}.model-controls .compact button{font-size:13px;padding:7px}.model-controls .check{flex-basis:100%;margin-top:6px}.legend{font-size:13px}.heart-pin{font-size:12px}.echo-toolbar{padding:0 16px 12px}.view-tabs{gap:4px}.view-tabs button{font-size:14px;padding:8px 9px}.screen-label{min-height:0;margin-bottom:10px}.echo-screen canvas{max-height:none}.echo-screen{padding:14px}.playback{padding:12px 16px;gap:10px}.playback input{order:3;flex-basis:100%}.playback #time{margin-left:auto}.connection{padding:16px 16px 0}.connection>.disclosure{margin:0 -16px}.disclosure summary{padding:13px 16px}.detail-body{padding:0 16px 16px}.speed-label{margin-left:0}.visual-expanded,.heart-expanded{inset:4px}.visual-expanded .ecg-wrap{overflow:auto}.visual-expanded #ecg,.visual-expanded #extraTracing{width:960px;max-width:none}.heart-expanded #heartStage{height:55dvh;min-height:320px}.visual-expanded .echo-grid{grid-template-columns:1fr}.visual-expanded .echo-screen canvas{max-height:none}.brand{gap:7px}.brand .brand-logo{width:36px;height:36px}.author{font-size:13px}}

/* User-supplied header and direct ECG enlargement */
.hero-banner{position:relative;margin:0 0 24px;border:1px solid var(--border);border-radius:14px;overflow:hidden;background:#061522}.hero-banner img{display:block;width:100%;height:auto;max-height:360px;object-fit:contain}.hero-banner figcaption{position:absolute;right:12px;bottom:10px;color:#d6e5ed;background:#061522db;padding:3px 8px;border-radius:5px;font-size:12px}.heading-action{font:inherit;font-weight:inherit;color:inherit;padding:0;border:0;border-radius:3px;min-height:0;text-align:left;text-underline-offset:5px}.heading-action:hover{background:none;color:#78e5dc;text-decoration:underline}.ecg-panel.visual-expanded{inset:0;border-radius:0}.ecg-panel.visual-expanded>.panel-head{position:sticky;top:0;background:var(--panel);z-index:5;border-bottom:1px solid var(--border);margin-bottom:18px}.ecg-panel.visual-expanded .ecg-wrap{width:calc(100% - 40px);max-width:1500px}.ecg-panel.visual-expanded .extra-ecg{width:calc(100% - 40px);max-width:1500px;overflow:auto}@media(max-width:760px){.hero-banner{margin-bottom:20px;border-radius:9px}.hero-banner img{max-height:none}.hero-banner figcaption{right:5px;bottom:5px;font-size:11px;padding:2px 5px}.ecg-panel.visual-expanded .ecg-wrap,.ecg-panel.visual-expanded .extra-ecg{width:calc(100% - 24px)}.ecg-panel .panel-head{flex-wrap:wrap;gap:10px}}

/* Integrated artwork and introduction */
.lab-wordmark{display:inline-flex;align-items:baseline;gap:7px;font-family:"Avenir Next","Trebuchet MS",sans-serif;font-size:18px;font-weight:700;letter-spacing:1.5px;white-space:nowrap}.lab-wordmark .lab-ai{color:#70e0d6}.lab-wordmark .lab-script{font-family:Georgia,"Times New Roman",serif;font-weight:400;font-style:italic;font-size:23px;letter-spacing:0;margin-left:1px}.intro-hero{position:relative;isolation:isolate;overflow:hidden;display:flex;align-items:center;min-height:260px;padding:36px;margin-bottom:24px;border:1px solid var(--border);border-radius:14px;background:#071625}.intro-art{position:absolute;z-index:-2;right:0;top:0;width:76%;height:100%;object-fit:cover;object-position:center;opacity:.78}.intro-hero::before{content:"";position:absolute;inset:0;z-index:-1;background:linear-gradient(90deg,#0b1928 0%,#0b1928f5 28%,#0b1928b8 48%,#0b192820 76%)}.intro-copy{max-width:52%}.intro-copy h1{font-size:clamp(28px,3vw,40px);line-height:1.15;margin:0 0 14px;letter-spacing:-1px}.intro-copy .subtitle{font-size:17px;line-height:1.6;color:#d3dfe8;margin:0 0 22px;max-width:370px}.intro-copy .badge{display:inline-block;background:#0b1928c9}.art-credit{position:absolute;right:12px;bottom:10px;color:#d6e5ed;background:#061522db;padding:3px 8px;border-radius:5px;font-size:12px}@media(max-width:760px){.intro-hero{min-height:240px;padding:24px;margin-bottom:20px}.intro-art{width:100%;opacity:.36;object-position:60% center}.intro-hero::before{background:linear-gradient(90deg,#0b1928ed,#0b1928ba 60%,#0b192850)}.intro-copy{max-width:90%}.intro-copy h1{font-size:30px}.intro-copy .subtitle{font-size:16px;max-width:330px;margin-bottom:18px}.lab-wordmark{font-size:15px;gap:4px;letter-spacing:1px}.lab-wordmark .lab-script{font-size:20px}.art-credit{font-size:11px}}@media(max-width:380px){.brand{font-size:18px;gap:5px}.brand .brand-logo{width:30px;height:30px}.lab-wordmark{font-size:13px}.lab-wordmark .lab-script{font-size:18px}.intro-hero{padding:20px}.intro-copy{max-width:100%}}

.artery-intro p{margin:0}.artery-label{color:var(--coral);font-weight:600}.artery-intro .artery-terms{margin-top:4px;font-size:14px;color:var(--muted)}

/* Keep the clinical selector available throughout the learning page. */
.toolbar{position:sticky;top:0;z-index:20;background:var(--bg);padding:12px 0;margin-bottom:8px;border-bottom:1px solid var(--border);box-shadow:0 8px 14px -12px #000b}.toolbar .case-label{margin:0}.toolbar select{min-width:0}html{scroll-padding-top:90px}.panel{scroll-margin-top:90px}@media(max-width:760px){.toolbar{padding:10px 0}.toolbar .case-label{gap:6px}html{scroll-padding-top:120px}.panel{scroll-margin-top:120px}}

/* Prominent, accessible primary learning control. */
.toolbar{padding:16px;border:1px solid #477b7c;border-left:4px solid var(--aqua);border-radius:10px;background:#102530;box-shadow:0 5px 18px #0003}.toolbar .case-label{gap:20px}.selector-caption{font-weight:700;color:var(--text);font-size:16px;flex-shrink:0}.selector-start{color:#79e6dc}.select-field{display:block;position:relative;flex:1;min-width:0;max-width:680px}.select-field::after{content:"";position:absolute;right:20px;top:50%;width:10px;height:10px;border-right:3px solid #071d25;border-bottom:3px solid #071d25;transform:translateY(-70%) rotate(45deg);pointer-events:none}.toolbar .case-label select{appearance:none;-webkit-appearance:none;width:100%;max-width:100%;min-height:56px;padding:13px 50px 13px 18px;border:2px solid #76e3da;border-radius:8px;background:#38C6BC;color:#071d25;font-size:18px;font-weight:750;line-height:1.4;box-shadow:0 2px 8px #0002}.toolbar .case-label select:hover{background:#58d5ca;border-color:#a5fff1}.toolbar .case-label select:focus-visible{outline:3px solid #f2f6fa;outline-offset:4px}.toolbar select option{background:#142332;color:#f2f6fa;font-size:16px;font-weight:500}@media(max-width:1000px){.selector-caption{flex-shrink:1;max-width:235px}.toolbar .case-label{gap:16px}}@media(max-width:760px){.toolbar{padding:12px;border-radius:8px}.toolbar .case-label{gap:10px;align-items:stretch}.selector-caption{max-width:none;font-size:15px}.select-field{width:100%;max-width:none;flex:auto}.toolbar .case-label select{font-size:17px;min-height:52px;padding:12px 44px 12px 14px}.select-field::after{right:17px}html{scroll-padding-top:140px}.panel{scroll-margin-top:140px}}