body{font-weight:400}body,h1,h2,h3,h4,h5,h6{font-family:var(--font-main)}h1,h2,h3,h4,h5,h6{font-weight:600!important}.evidence-quote,blockquote,q{font-family:var(--font-manuscript);font-style:italic;font-weight:400!important}.technical-label,code,kbd,pre,samp{font-family:var(--font-main)}.manuscript-example,.manuscript-example :where(h1,h2,h3,h4,h5,h6){font-family:var(--font-manuscript)}:root{--hero-context:174 69% 32%;--hero-support:148 45% 35%;--hero-grid:224 71% 4%}.dark{--hero-context:174 60% 53%;--hero-support:148 48% 58%;--hero-grid:0 0% 100%}.hero-ecg-grid{background-image:linear-gradient(hsl(var(--hero-grid)/.05) 1px,transparent 1px),linear-gradient(90deg,hsl(var(--hero-grid)/.05) 1px,transparent 1px),linear-gradient(hsl(var(--hero-grid)/.022) 1px,transparent 1px),linear-gradient(90deg,hsl(var(--hero-grid)/.022) 1px,transparent 1px);background-size:40px 40px,40px 40px,8px 8px,8px 8px;-webkit-mask-image:linear-gradient(180deg,transparent 0,black 10%,black 60%,rgb(0 0 0/.7) 76%,transparent 96%);mask-image:linear-gradient(180deg,transparent 0,black 10%,black 60%,rgb(0 0 0/.7) 76%,transparent 96%)}.dark .hero-ecg-grid{background-image:linear-gradient(hsl(var(--hero-grid)/.06) 1px,transparent 1px),linear-gradient(90deg,hsl(var(--hero-grid)/.06) 1px,transparent 1px),linear-gradient(hsl(var(--hero-grid)/.028) 1px,transparent 1px),linear-gradient(90deg,hsl(var(--hero-grid)/.028) 1px,transparent 1px)}.verify-dot-grid{background-image:radial-gradient(hsl(var(--hero-grid)/.04) 2px,transparent 2px);background-size:24px 24px;mask-image:linear-gradient(180deg,transparent 0,black 22%,black 70%,transparent)}.dark .verify-dot-grid{background-image:radial-gradient(hsl(var(--hero-grid)/.045) 2px,transparent 2px)}.guide-ul>li{position:relative;padding-left:1.25rem}.guide-ul>li:before{content:"";position:absolute;left:2px;top:.68em;height:6px;width:6px;border-radius:9999px;background:hsl(var(--primary)/.45)}.guide-ol{counter-reset:guide-ol;list-style:none}.guide-ol>li{counter-increment:guide-ol;position:relative;padding-left:2.25rem}.guide-ol>li:before{content:counter(guide-ol,decimal-leading-zero);position:absolute;left:0;top:.25em;font-family:var(--font-main);font-size:11px;font-weight:600;color:hsl(var(--primary))}.guide-check-list ol,.guide-check-list ul{list-style:none;margin-top:0;max-width:none;counter-reset:none}.guide-check-list li{position:relative;padding-left:1.9rem}.guide-check-list li:before{content:"✓";position:absolute;left:0;top:.18em;display:flex;height:1.15rem;width:1.15rem;align-items:center;justify-content:center;border-radius:9999px;background:color-mix(in srgb,var(--guide-check,hsl(var(--primary))) 14%,transparent);color:var(--guide-check,hsl(var(--primary)));font-size:10px;font-weight:700}.guide-breath-list ul{list-style:none;margin-top:0;max-width:none;color:rgb(226 232 240)}.guide-breath-list li{position:relative;padding-left:1.9rem}.guide-breath-list li:before{content:"✓";position:absolute;left:0;top:.18em;display:flex;height:1.15rem;width:1.15rem;align-items:center;justify-content:center;border-radius:9999px;background:rgb(94 234 212/.12);color:rgb(94 234 212);font-size:10px;font-weight:700}.guide-breath-list strong{color:white}.guide-source-list ul{list-style:none;margin-top:0;max-width:none}.guide-source-list li{padding:.625rem 0}.guide-source-list li:before{content:none}.guide-source-list li+li{border-top:1px solid hsl(var(--border))}.guide-source-grid ul{display:grid;gap:.75rem;list-style:none;max-width:none}@media (min-width:640px){.guide-source-grid ul{grid-template-columns:1fr 1fr}}.guide-source-grid ul>li{border:1px solid hsl(var(--border));border-radius:1rem;background:hsl(var(--card));padding:1rem 1.125rem;font-size:14px;line-height:1.7}.guide-source-grid ul>li:before{content:none}.guide-source-grid ul>li{padding-left:1.125rem}.guide-key-idea p{margin-top:0;font-family:var(--font-manuscript);font-style:italic;font-size:17px;line-height:1.7;color:hsl(var(--foreground))}.guide-next-card p{margin-top:0;max-width:none;font-size:14px;line-height:1.65}.guide-cite{font-size:.72em;line-height:0;margin-left:1px;letter-spacing:.02em;white-space:nowrap}.guide-cite a{color:hsl(var(--primary));font-weight:600;text-decoration:none;padding:1px 1px 2px;border-radius:3px;transition:background-color .12s ease}.guide-cite a:hover{background:hsl(var(--primary)/.12);text-decoration:underline;text-underline-offset:2px}.guide-cite-sep{color:hsl(var(--primary)/.6);margin-right:1px}@keyframes guide-cite-flash{0%{background-color:hsl(var(--primary)/.22)}to{background-color:transparent}}.guide-cite-flash{animation:guide-cite-flash 1.6s ease-out;border-radius:4px}body,html{overflow-x:clip;max-width:100vw}.overflow-x-auto::-webkit-scrollbar{display:none}@font-face{font-family:Instrument Sans;font-style:normal;font-weight:400;font-stretch:100%;font-display:swap;src:url(/_next/static/media/adb45196eddef626-s.woff2) format("woff2");unicode-range:u+0100-02ba,u+02bd-02c5,u+02c7-02cc,u+02ce-02d7,u+02dd-02ff,u+0304,u+0308,u+0329,u+1d00-1dbf,u+1e00-1e9f,u+1ef2-1eff,u+2020,u+20a0-20ab,u+20ad-20c0,u+2113,u+2c60-2c7f,u+a720-a7ff}@font-face{font-family:Instrument Sans;font-style:normal;font-weight:400;font-stretch:100%;font-display:swap;src:url(/_next/static/media/26d0ba92e140f0dc-s.p.woff2) format("woff2");unicode-range:u+00??,u+0131,u+0152-0153,u+02bb-02bc,u+02c6,u+02da,u+02dc,u+0304,u+0308,u+0329,u+2000-206f,u+20ac,u+2122,u+2191,u+2193,u+2212,u+2215,u+feff,u+fffd}@font-face{font-family:Instrument Sans;font-style:normal;font-weight:500;font-stretch:100%;font-display:swap;src:url(/_next/static/media/adb45196eddef626-s.woff2) format("woff2");unicode-range:u+0100-02ba,u+02bd-02c5,u+02c7-02cc,u+02ce-02d7,u+02dd-02ff,u+0304,u+0308,u+0329,u+1d00-1dbf,u+1e00-1e9f,u+1ef2-1eff,u+2020,u+20a0-20ab,u+20ad-20c0,u+2113,u+2c60-2c7f,u+a720-a7ff}@font-face{font-family:Instrument Sans;font-style:normal;font-weight:500;font-stretch:100%;font-display:swap;src:url(/_next/static/media/26d0ba92e140f0dc-s.p.woff2) format("woff2");unicode-range:u+00??,u+0131,u+0152-0153,u+02bb-02bc,u+02c6,u+02da,u+02dc,u+0304,u+0308,u+0329,u+2000-206f,u+20ac,u+2122,u+2191,u+2193,u+2212,u+2215,u+feff,u+fffd}@font-face{font-family:Instrument Sans;font-style:normal;font-weight:600;font-stretch:100%;font-display:swap;src:url(/_next/static/media/adb45196eddef626-s.woff2) format("woff2");unicode-range:u+0100-02ba,u+02bd-02c5,u+02c7-02cc,u+02ce-02d7,u+02dd-02ff,u+0304,u+0308,u+0329,u+1d00-1dbf,u+1e00-1e9f,u+1ef2-1eff,u+2020,u+20a0-20ab,u+20ad-20c0,u+2113,u+2c60-2c7f,u+a720-a7ff}@font-face{font-family:Instrument Sans;font-style:normal;font-weight:600;font-stretch:100%;font-display:swap;src:url(/_next/static/media/26d0ba92e140f0dc-s.p.woff2) format("woff2");unicode-range:u+00??,u+0131,u+0152-0153,u+02bb-02bc,u+02c6,u+02da,u+02dc,u+0304,u+0308,u+0329,u+2000-206f,u+20ac,u+2122,u+2191,u+2193,u+2212,u+2215,u+feff,u+fffd}@font-face{font-family:Instrument Sans;font-style:normal;font-weight:700;font-stretch:100%;font-display:swap;src:url(/_next/static/media/adb45196eddef626-s.woff2) format("woff2");unicode-range:u+0100-02ba,u+02bd-02c5,u+02c7-02cc,u+02ce-02d7,u+02dd-02ff,u+0304,u+0308,u+0329,u+1d00-1dbf,u+1e00-1e9f,u+1ef2-1eff,u+2020,u+20a0-20ab,u+20ad-20c0,u+2113,u+2c60-2c7f,u+a720-a7ff}@font-face{font-family:Instrument Sans;font-style:normal;font-weight:700;font-stretch:100%;font-display:swap;src:url(/_next/static/media/26d0ba92e140f0dc-s.p.woff2) format("woff2");unicode-range:u+00??,u+0131,u+0152-0153,u+02bb-02bc,u+02c6,u+02da,u+02dc,u+0304,u+0308,u+0329,u+2000-206f,u+20ac,u+2122,u+2191,u+2193,u+2212,u+2215,u+feff,u+fffd}@font-face{font-family:Instrument Sans Fallback;src:local("Arial");ascent-override:94.42%;descent-override:24.33%;line-gap-override:0.00%;size-adjust:102.74%}.__className_be5b54{font-family:Instrument Sans,Instrument Sans Fallback;font-style:normal}.__variable_be5b54{--font-main:"Instrument Sans","Instrument Sans Fallback"}@font-face{font-family:"Source Serif 4";font-style:italic;font-weight:400;font-display:swap;src:url(/_next/static/media/c1e0ae606c0d380f-s.woff2) format("woff2");unicode-range:u+0460-052f,u+1c80-1c8a,u+20b4,u+2de0-2dff,u+a640-a69f,u+fe2e-fe2f}@font-face{font-family:"Source Serif 4";font-style:italic;font-weight:400;font-display:swap;src:url(/_next/static/media/9cc95445f0ce201a-s.woff2) format("woff2");unicode-range:u+0301,u+0400-045f,u+0490-0491,u+04b0-04b1,u+2116}@font-face{font-family:"Source Serif 4";font-style:italic;font-weight:400;font-display:swap;src:url(/_next/static/media/24f599ce1a627b37-s.woff2) format("woff2");unicode-range:u+0370-0377,u+037a-037f,u+0384-038a,u+038c,u+038e-03a1,u+03a3-03ff}@font-face{font-family:"Source Serif 4";font-style:italic;font-weight:400;font-display:swap;src:url(/_next/static/media/ea308541f46fdb72-s.woff2) format("woff2");unicode-range:u+0102-0103,u+0110-0111,u+0128-0129,u+0168-0169,u+01a0-01a1,u+01af-01b0,u+0300-0301,u+0303-0304,u+0308-0309,u+0323,u+0329,u+1ea0-1ef9,u+20ab}@font-face{font-family:"Source Serif 4";font-style:italic;font-weight:400;font-display:swap;src:url(/_next/static/media/1b5a038d2ebd8073-s.woff2) format("woff2");unicode-range:u+0100-02ba,u+02bd-02c5,u+02c7-02cc,u+02ce-02d7,u+02dd-02ff,u+0304,u+0308,u+0329,u+1d00-1dbf,u+1e00-1e9f,u+1ef2-1eff,u+2020,u+20a0-20ab,u+20ad-20c0,u+2113,u+2c60-2c7f,u+a720-a7ff}@font-face{font-family:"Source Serif 4";font-style:italic;font-weight:400;font-display:swap;src:url(/_next/static/media/d9c8a48aa27d17bd-s.p.woff2) format("woff2");unicode-range:u+00??,u+0131,u+0152-0153,u+02bb-02bc,u+02c6,u+02da,u+02dc,u+0304,u+0308,u+0329,u+2000-206f,u+20ac,u+2122,u+2191,u+2193,u+2212,u+2215,u+feff,u+fffd}@font-face{font-family:"Source Serif 4";font-style:italic;font-weight:600;font-display:swap;src:url(/_next/static/media/c1e0ae606c0d380f-s.woff2) format("woff2");unicode-range:u+0460-052f,u+1c80-1c8a,u+20b4,u+2de0-2dff,u+a640-a69f,u+fe2e-fe2f}@font-face{font-family:"Source Serif 4";font-style:italic;font-weight:600;font-display:swap;src:url(/_next/static/media/9cc95445f0ce201a-s.woff2) format("woff2");unicode-range:u+0301,u+0400-045f,u+0490-0491,u+04b0-04b1,u+2116}@font-face{font-family:"Source Serif 4";font-style:italic;font-weight:600;font-display:swap;src:url(/_next/static/media/24f599ce1a627b37-s.woff2) format("woff2");unicode-range:u+0370-0377,u+037a-037f,u+0384-038a,u+038c,u+038e-03a1,u+03a3-03ff}@font-face{font-family:"Source Serif 4";font-style:italic;font-weight:600;font-display:swap;src:url(/_next/static/media/ea308541f46fdb72-s.woff2) format("woff2");unicode-range:u+0102-0103,u+0110-0111,u+0128-0129,u+0168-0169,u+01a0-01a1,u+01af-01b0,u+0300-0301,u+0303-0304,u+0308-0309,u+0323,u+0329,u+1ea0-1ef9,u+20ab}@font-face{font-family:"Source Serif 4";font-style:italic;font-weight:600;font-display:swap;src:url(/_next/static/media/1b5a038d2ebd8073-s.woff2) format("woff2");unicode-range:u+0100-02ba,u+02bd-02c5,u+02c7-02cc,u+02ce-02d7,u+02dd-02ff,u+0304,u+0308,u+0329,u+1d00-1dbf,u+1e00-1e9f,u+1ef2-1eff,u+2020,u+20a0-20ab,u+20ad-20c0,u+2113,u+2c60-2c7f,u+a720-a7ff}@font-face{font-family:"Source Serif 4";font-style:italic;font-weight:600;font-display:swap;src:url(/_next/static/media/d9c8a48aa27d17bd-s.p.woff2) format("woff2");unicode-range:u+00??,u+0131,u+0152-0153,u+02bb-02bc,u+02c6,u+02da,u+02dc,u+0304,u+0308,u+0329,u+2000-206f,u+20ac,u+2122,u+2191,u+2193,u+2212,u+2215,u+feff,u+fffd}@font-face{font-family:"Source Serif 4";font-style:normal;font-weight:400;font-display:swap;src:url(/_next/static/media/3d165c286d94e27c-s.woff2) format("woff2");unicode-range:u+0460-052f,u+1c80-1c8a,u+20b4,u+2de0-2dff,u+a640-a69f,u+fe2e-fe2f}@font-face{font-family:"Source Serif 4";font-style:normal;font-weight:400;font-display:swap;src:url(/_next/static/media/e54d16b9f2c4535b-s.woff2) format("woff2");unicode-range:u+0301,u+0400-045f,u+0490-0491,u+04b0-04b1,u+2116}@font-face{font-family:"Source Serif 4";font-style:normal;font-weight:400;font-display:swap;src:url(/_next/static/media/7c21074d9bafed1b-s.woff2) format("woff2");unicode-range:u+0370-0377,u+037a-037f,u+0384-038a,u+038c,u+038e-03a1,u+03a3-03ff}@font-face{font-family:"Source Serif 4";font-style:normal;font-weight:400;font-display:swap;src:url(/_next/static/media/916860560b9a2bc2-s.woff2) format("woff2");unicode-range:u+0102-0103,u+0110-0111,u+0128-0129,u+0168-0169,u+01a0-01a1,u+01af-01b0,u+0300-0301,u+0303-0304,u+0308-0309,u+0323,u+0329,u+1ea0-1ef9,u+20ab}@font-face{font-family:"Source Serif 4";font-style:normal;font-weight:400;font-display:swap;src:url(/_next/static/media/591e43f23f51e5a5-s.woff2) format("woff2");unicode-range:u+0100-02ba,u+02bd-02c5,u+02c7-02cc,u+02ce-02d7,u+02dd-02ff,u+0304,u+0308,u+0329,u+1d00-1dbf,u+1e00-1e9f,u+1ef2-1eff,u+2020,u+20a0-20ab,u+20ad-20c0,u+2113,u+2c60-2c7f,u+a720-a7ff}@font-face{font-family:"Source Serif 4";font-style:normal;font-weight:400;font-display:swap;src:url(/_next/static/media/97ac91773d3121b2-s.p.woff2) format("woff2");unicode-range:u+00??,u+0131,u+0152-0153,u+02bb-02bc,u+02c6,u+02da,u+02dc,u+0304,u+0308,u+0329,u+2000-206f,u+20ac,u+2122,u+2191,u+2193,u+2212,u+2215,u+feff,u+fffd}@font-face{font-family:"Source Serif 4";font-style:normal;font-weight:600;font-display:swap;src:url(/_next/static/media/3d165c286d94e27c-s.woff2) format("woff2");unicode-range:u+0460-052f,u+1c80-1c8a,u+20b4,u+2de0-2dff,u+a640-a69f,u+fe2e-fe2f}@font-face{font-family:"Source Serif 4";font-style:normal;font-weight:600;font-display:swap;src:url(/_next/static/media/e54d16b9f2c4535b-s.woff2) format("woff2");unicode-range:u+0301,u+0400-045f,u+0490-0491,u+04b0-04b1,u+2116}@font-face{font-family:"Source Serif 4";font-style:normal;font-weight:600;font-display:swap;src:url(/_next/static/media/7c21074d9bafed1b-s.woff2) format("woff2");unicode-range:u+0370-0377,u+037a-037f,u+0384-038a,u+038c,u+038e-03a1,u+03a3-03ff}@font-face{font-family:"Source Serif 4";font-style:normal;font-weight:600;font-display:swap;src:url(/_next/static/media/916860560b9a2bc2-s.woff2) format("woff2");unicode-range:u+0102-0103,u+0110-0111,u+0128-0129,u+0168-0169,u+01a0-01a1,u+01af-01b0,u+0300-0301,u+0303-0304,u+0308-0309,u+0323,u+0329,u+1ea0-1ef9,u+20ab}@font-face{font-family:"Source Serif 4";font-style:normal;font-weight:600;font-display:swap;src:url(/_next/static/media/591e43f23f51e5a5-s.woff2) format("woff2");unicode-range:u+0100-02ba,u+02bd-02c5,u+02c7-02cc,u+02ce-02d7,u+02dd-02ff,u+0304,u+0308,u+0329,u+1d00-1dbf,u+1e00-1e9f,u+1ef2-1eff,u+2020,u+20a0-20ab,u+20ad-20c0,u+2113,u+2c60-2c7f,u+a720-a7ff}@font-face{font-family:"Source Serif 4";font-style:normal;font-weight:600;font-display:swap;src:url(/_next/static/media/97ac91773d3121b2-s.p.woff2) format("woff2");unicode-range:u+00??,u+0131,u+0152-0153,u+02bb-02bc,u+02c6,u+02da,u+02dc,u+0304,u+0308,u+0329,u+2000-206f,u+20ac,u+2122,u+2191,u+2193,u+2212,u+2215,u+feff,u+fffd}@font-face{font-family:"Source Serif 4 Fallback";src:local("Times New Roman");ascent-override:87.87%;descent-override:28.41%;line-gap-override:0.00%;size-adjust:117.91%}.__className_7d9873{font-family:"Source Serif 4","Source Serif 4 Fallback"}.__variable_7d9873{--font-manuscript:"Source Serif 4","Source Serif 4 Fallback"}