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img{width:100%;height:auto;display:block;max-width:none}.ekg-progress-entry{background:#fff7f7}.ekg-progress-entry>span{color:#b80f16;display:grid;place-items:center;width:40px;height:40px;flex:none}.ekg-progress-entry>div{flex:1}.ekg-progress-entry h3{font-size:17px;margin:0}.ekg-home-entry{display:flex;gap:18px;align-items:center;background:#fff;border:1px solid #e8d4d7;padding:22px 27px;border-radius:13px;margin:0 0 20px}.ekg-home-entry>span{width:44px;height:44px;background:#fff0f0;color:#b80f16;border-radius:12px;display:grid;place-items:center;flex:none}.ekg-home-entry>div{flex:1}.ekg-home-entry h2{font-size:20px;margin:6px 0}.ekg-home-entry p{font-size:12px;color:#6e7c90;margin:0;line-height:1.6}.ekg-home-entry .eyebrow{color:#aa3042}.ekg-home-entry .btn{white-space:normal}.sr-only{position:absolute!important;clip:rect(0,0,0,0);clip-path:inset(50%);width:1px;height:1px;padding:0;overflow:hidden;white-space:nowrap}
@media(min-width:1600px){.ekg-reading{padding:50px 65px}.ekg-hero{padding:45px}.ekg-area .ekg-hero p{font-size:15px}}
@media(max-width:1100px){.ekg-hero{grid-template-columns:1fr;padding:30px}.ekg-hero-signal{max-width:600px;width:100%;transform:none}.ekg-hero h2 br{display:none}.ekg-hero h2{font-size:34px}.ekg-mode-grid{grid-template-columns:1fr}.ekg-mode-grid article{display:grid;grid-template-columns:44px 1fr;column-gap:18px}.ekg-mode-grid h3{margin:0 0 8px}.ekg-mode-grid p,.ekg-mode-grid .text-button{grid-column:2}.ekg-lesson-grid{grid-template-columns:1fr}.ekg-clinical-layout{grid-template-columns:240px minmax(0,1fr)}.ekg-feature-grid,.ekg-feature-feedback,.ekg-compare{grid-template-columns:1fr}.ekg-reading{padding:32px}.ekg-ruler-inputs{grid-template-columns:1fr 1fr}.ekg-ruler-inputs output{grid-column:1/-1}}
@media(max-width:750px){.ekg-tabs{margin-bottom:22px}.ekg-tabs>button{padding:12px 11px;font-size:12px}.ekg-stats{grid-template-columns:1fr 1fr}.ekg-stats>div{padding:19px}.ekg-stats b{font-size:25px}.ekg-hero{padding:25px;gap:22px}.ekg-hero h2{font-size:30px}.ekg-hero p{font-size:13px}.ekg-hero .button-row{align-items:stretch;flex-direction:column;width:100%}.ekg-hero .button-row .btn{justify-content:center}.ekg-case-grid{grid-template-columns:1fr}.ekg-clinical-layout{grid-template-columns:1fr}.ekg-investigations{position:static;display:grid;grid-template-columns:1fr 1fr;gap:8px;padding:19px}.ekg-investigations h3,.ekg-readiness{grid-column:1/-1}.ekg-investigations>button{margin:0;padding:12px 9px}.ekg-investigations button span{font-size:11px}.ekg-investigations button small{font-size:9px}.ekg-diagnosis-options{grid-template-columns:1fr}.ekg-reading{padding:25px 21px}.ekg-reading header h2{font-size:27px}.ekg-text-section p{font-size:13px}.ekg-lead{font-size:14px}.ekg-model{padding:16px}.ekg-model-explanation{min-height:0!important}.ekg-ruler-inputs{grid-template-columns:1fr}.ekg-ruler-inputs output{grid-column:auto}.ekg-filter-row{grid-template-columns:1fr;gap:15px}.ekg-training-config{padding:22px}.ekg-round-count{font-size:35px;min-width:82px}.ekg-round-count small{font-size:9px}.ekg-training-intro{gap:15px}.ekg-training-intro h2{font-size:26px}.ekg-training-intro p{font-size:13px}.ekg-run-top{align-items:flex-start;font-size:10px}.ekg-run-top>span{text-align:right;max-width:65%}.ekg-question-title{font-size:23px}.ekg-answer-panel,.ekg-feature-panel,.ekg-clinical-decisions{padding:20px}.ekg-answer-panel h3{font-size:16px}.ekg-image-stack{padding:8px}.ekg-image-toolbar{padding:10px 12px}.ekg-radio{font-size:12px;padding:13px 12px}.ekg-result-heading{align-items:flex-start;padding:21px;gap:12px}.ekg-result-heading h3{font-size:21px}.ekg-result-heading>span{width:35px;height:35px}.ekg-feedback-body{padding:21px}.ekg-feedback-body p{font-size:13px}.ekg-summary{padding:28px 20px}.ekg-summary h2{font-size:25px}.ekg-round-review article{gap:12px;flex-wrap:wrap;padding:20px 16px}.ekg-round-review article>div{flex-basis:75%}.ekg-round-review article>.btn{margin-left:33px;font-size:11px}.ekg-callout,.ekg-progress-entry{flex-wrap:wrap;padding:20px}.ekg-callout>.btn,.ekg-progress-entry>.btn{width:100%;justify-content:center}.ekg-reading-head{font-size:11px}.ekg-reading-finish>.btn{width:100%;justify-content:center}.ekg-model .ekg-signal,.ekg-model .ekg-ladder{min-width:600px}.ekg-model>div[id$="view"]{overflow:auto}.ekg-coverage>div{display:block}.ekg-coverage>div p{margin-top:7px}.ekg-corrections,.ekg-source-list,.ekg-coverage,.ekg-archive{padding:22px}.ekg-corrections summary{font-size:13px}.ekg-home-entry{flex-wrap:wrap;padding:21px;gap:12px}.ekg-home-entry>div{flex-basis:70%}.ekg-home-entry>.btn{width:100%;justify-content:center}.ekg-home-entry h2{font-size:18px}.ekg-grade-actions>.btn{width:100%;justify-content:center}.ekg-alarm{padding:42px 23px}.ekg-alarm h2{font-size:27px}.ekg-alarm p{font-size:15px}.ekg-alarm>.btn{width:100%;justify-content:center}.ekg-feature-grid select{max-width:100%;font-size:12px}}
@media(prefers-reduced-motion:reduce){.ekg-run-progress i{transition:none}.ekg-area *{scroll-behavior:auto!important}}

.ekg-stats{grid-template-columns:repeat(3,minmax(0,1fr))}.ekg-mode-grid{grid-template-columns:repeat(2,minmax(0,1fr))}@media(max-width:700px){.ekg-stats,.ekg-mode-grid{grid-template-columns:1fr}}

.ekg-electrode-section{margin:30px 0 40px;padding:22px;background:#f7f8fb;border:1px solid #dce1e8;border-radius:14px}.ekg-electrode-heading{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:17px}.ekg-electrode-heading h3{font-size:21px;margin:8px 0 0}.ekg-electrode-heading .btn{white-space:normal;flex-shrink:0;font-size:12px}.ekg-electrode-figure{margin:0}.ekg-electrode-image{display:block;border:0;padding:0;background:transparent;width:100%;cursor:zoom-in;border-radius:10px}.ekg-electrode-image img{width:100%;height:auto;display:block}.ekg-electrode-figure figcaption{font-size:12px;color:#596c82;line-height:1.7;margin:15px 0}.ekg-reading .ekg-electrode-note{font-size:12px;color:#52647a;line-height:1.8}.ekg-reading .ekg-electrode-source{font-size:10px;line-height:1.7;color:#748296;margin-bottom:0}.ekg-electrode-source a{color:#98414a;overflow-wrap:anywhere}
@media(max-width:620px){.ekg-electrode-section{padding:13px;margin:22px -5px}.ekg-electrode-heading{align-items:start;flex-direction:column}.ekg-electrode-heading h3{font-size:19px}.ekg-electrode-heading .btn{min-height:40px}}

/* Visual learning: blue = exploration; correctness colours stay in scored feedback. */
.ekg-visual{border:1px solid #cbdde8;background:#f5f9fc;border-radius:14px;padding:24px;margin:26px 0;color:#24364b}.ekg-visual-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:18px}.ekg-visual-heading h3{font-size:23px;margin:8px 0 0}.ekg-visual .eyebrow{color:#176b91}.ekg-visual-prompt{font-size:14px;max-width:74ch;color:#4d6377}.ekg-visual-options{display:flex;flex-wrap:wrap;gap:8px;margin:20px 0}.ekg-visual-options button,.ekg-visual-tools button{cursor:pointer;border:1px solid #b6cbd9;border-radius:8px;padding:11px 15px;min-height:44px;background:#fff;color:#25526e;font:inherit;font-size:13px;font-weight:650;line-height:1.4}.ekg-visual-options button[aria-pressed=true]{background:#176b91;border-color:#176b91;color:#fff;box-shadow:0 0 0 2px #176b9120}.ekg-visual-canvas{background:#fff;border:1px solid #dae3e9;border-radius:12px;padding:12px;min-width:0}.ekg-teaching-svg{display:block;width:100%;height:auto;font-family:Inter,"Segoe UI",system-ui,sans-serif}.ekg-heart-and-curve{display:grid;grid-template-columns:.6fr 1fr;align-items:center;gap:16px}.ekg-visual-ladder{border-top:1px solid #e0e7ed;margin-top:8px;padding-top:12px}.ekg-visual-tools{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:14px 0}.ekg-visual-tools>span{font-size:11px;color:#64788a;line-height:1.6}.ekg-visual-tools button{flex-shrink:0}.ekg-visual-explanation{border-left:3px solid #176b91;background:#fff;border-radius:0 8px 8px 0;padding:18px 20px}.ekg-visual-explanation h4{font-size:18px;margin:0 0 12px}.ekg-visual-explanation ul{padding:0;margin:0;list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:12px}.ekg-visual-explanation li{font-size:13px;font-weight:650;line-height:1.5;padding-left:17px;position:relative}.ekg-visual-explanation li:before{content:"";position:absolute;left:0;top:6px;border:2px solid #176b91;border-radius:50%;width:6px;height:6px}.ekg-visual-explanation p{margin:14px 0 0;font-size:14px;color:#4c6175}.ekg-visual-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:14px 0 0}.ekg-visual-cards>div{background:#f5f9fc;padding:16px;border:1px solid #dce7ee;border-radius:8px}.ekg-visual-cards span{display:block;font-size:12px;font-weight:700;color:#176b91;margin-bottom:10px}.ekg-visual-cards b{display:block;font-size:14px}.ekg-visual-cards p{font-size:12px;line-height:1.6;margin:7px 0 0;color:#536b7f}.ekg-reading-reference{border-top:1px solid #e0e7ee;margin:28px 0;padding-top:4px}.ekg-reading-reference .ekg-table-scroll{max-width:100%}.ekg-ruler-model{background:#f5f9fc;border-color:#cbdde8}.ekg-ruler-model .ekg-teaching-svg{background:#fff;border:1px solid #dce3e9;border-radius:10px}.ekg-zoom-body .ekg-teaching-svg{min-width:500px}.ekg-zoom-body .ekg-heart-and-curve{min-width:650px}.ekg-area .ekg-visual [hidden]{display:none}
@media(max-width:700px){.ekg-visual{padding:16px;margin:20px -4px}.ekg-visual-heading{flex-direction:column;gap:14px}.ekg-visual-heading h3{font-size:21px}.ekg-visual-prompt{font-size:13px}.ekg-visual-options{gap:7px}.ekg-visual-options button{padding:10px 12px;font-size:12px;flex:1 1 auto}.ekg-visual-canvas{padding:6px}.ekg-heart-and-curve{grid-template-columns:1fr;gap:6px}.ekg-heart-and-curve>svg{max-height:240px}.ekg-visual-tools{align-items:flex-start;flex-direction:column}.ekg-visual-explanation{padding:16px}.ekg-visual-explanation ul{grid-template-columns:1fr;gap:9px}.ekg-visual-cards{grid-template-columns:1fr}.ekg-visual-cards>div{display:grid;grid-template-columns:22px 1fr;gap:4px 8px;padding:12px}.ekg-visual-cards span{grid-row:1 / 3;margin:2px 0}.ekg-visual-cards p{margin:0}.ekg-zoom-body .ekg-heart-and-curve{grid-template-columns:.6fr 1fr;min-width:700px}}

.ekg-lesson-page>.page-heading{margin-bottom:18px}.ekg-lesson-page>.page-heading h1{font-size:23px;margin:7px 0}.ekg-lesson-page>.page-heading p{display:none}.ekg-lesson-page>.ekg-tabs{margin-bottom:22px}.ekg-lesson-page .ekg-reading header{padding-bottom:18px;margin-bottom:20px}.ekg-lesson-page .ekg-reading header h2{font-size:28px}.ekg-lesson-page .ekg-reading{padding:28px}.ekg-lesson-page .ekg-reading .ekg-visual:first-of-type{margin-top:20px}
@media(max-width:700px){.ekg-lesson-page .ekg-reading{padding:18px}.ekg-lesson-page>.page-heading h1{font-size:20px}.ekg-lesson-page .ekg-reading header h2{font-size:25px}}

.ekg-visual-mobile-hint{display:none}@media(max-width:700px){.ekg-visual .ekg-visual-mobile-hint{display:block;font-size:12px;line-height:1.6;color:#526b7f;margin:10px 0}}