@font-face{font-family:Cormorant Garamond;font-style:normal;font-display:swap;font-weight:400;src:url(/ai-web-experience-collection/chronos/fonts/cormorant-garamond-latin-400-normal.woff2)format("woff2")}@font-face{font-family:Cormorant Garamond;font-style:italic;font-display:swap;font-weight:400;src:url(/ai-web-experience-collection/pelagic/fonts/cormorant-garamond-latin-400-italic.woff2)format("woff2")}@font-face{font-family:DM Sans;font-style:normal;font-display:swap;font-weight:400;src:url(/ai-web-experience-collection/shared/fonts/dm-sans-latin-400-normal.woff2)format("woff2")}@font-face{font-family:DM Sans;font-style:normal;font-display:swap;font-weight:500;src:url(/ai-web-experience-collection/shared/fonts/dm-sans-latin-500-normal.woff2)format("woff2")}@layer reset{*,:before,:after{box-sizing:border-box}html{scroll-behavior:auto;scroll-padding-top:105px}body,h1,h2,h3,p,figure{margin:0}button,a,input{-webkit-tap-highlight-color:transparent}button{font:inherit}button,a{touch-action:manipulation}button{cursor:pointer}a{color:inherit;text-decoration:none}img,svg{display:block}img{max-width:100%}::selection{color:#130c10;background:#d8b998}}@layer base{:root{--ink:#130c10;--deep:#10080d;--ivory:#f1e9e1;--gold:#cba66c;--rose:#cb787a;--slate:#8cbdca;--muted:#bba9ab;--rule:#73545e55;--font-serif:"Cormorant Garamond", Georgia, serif;--font-sans:"DM Sans", Arial, sans-serif;--gutter:clamp(24px, 5.2vw, 100px);--story-progress:0;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}body{background:var(--ink);color:var(--ivory);font-family:var(--font-sans);-webkit-font-smoothing:antialiased;font-size:17px;line-height:1.7}h1,h2{font-family:var(--font-serif);letter-spacing:-.045em;text-wrap:balance;font-weight:400;line-height:1.02}h3{letter-spacing:-.02em;font-size:19px;font-weight:500;line-height:1.35}em{font-weight:400}p{text-wrap:pretty}a,button,summary{outline-offset:5px}:focus-visible{outline:2px solid var(--gold)}[tabindex="-1"]:focus:not(:focus-visible){outline:none}button{color:inherit;background:0 0;border:0;border-radius:0}.icon{flex-shrink:0;width:22px;height:22px}.sr-only{clip:rect(0,0,0,0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}html:not(.js) .js-only{display:none!important}.js .js-only{display:flex}.js .no-js{display:none}.skip-link{z-index:200;background:var(--ivory);color:var(--ink);padding:12px 22px;position:fixed;top:-100px;left:20px}.skip-link:focus{top:15px}.section-container{width:min(100% - var(--gutter) * 2, 1560px);margin-inline:auto}}@layer layout{.site-header{z-index:40;width:100%;min-height:90px;padding:18px var(--gutter);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);color:var(--ivory);background:#130c10ec;border-bottom:1px solid #ae8d971e;align-items:center;gap:28px;display:flex;position:fixed;top:0;left:0}.wordmark{letter-spacing:.17em;align-items:center;gap:10px;font-size:24px;font-weight:500;line-height:1;display:flex}.wordmark svg{width:32px;height:36px;color:var(--gold)}.brand-subtitle{color:#b9a6a9;border-left:1px solid #75515b66;max-width:140px;padding-left:25px;font-size:12px;line-height:1.3}.header-actions{align-items:center;gap:clamp(12px,2vw,28px);margin-left:auto;display:flex}.header-button{letter-spacing:.01em;justify-content:center;align-items:center;gap:7px;min-height:44px;padding:4px 0;font-size:12px;line-height:1.4;display:flex}.header-button:hover{color:#dfbd8c}.header-button .icon{width:17px;height:17px}.chapters-button{border-left:1px solid #75515b66;gap:16px;padding-left:24px}.hero{isolation:isolate;background:var(--deep);height:100svh;min-height:760px;max-height:1320px;position:relative}.art-picture{display:block}.art-picture img{object-fit:contain;width:100%;height:100%}.hero-art{z-index:-1;position:absolute;inset:85px 0 35px;-webkit-mask-image:linear-gradient(#000 86%,#0000);mask-image:linear-gradient(#000 86%,#0000)}.hero-art img{object-position:center}.hero-art:after{content:"";pointer-events:none;background:radial-gradient(ellipse at var(--hero-graze-position,50%) 43%, #f1d6bd88, #dbb59b22 28%, transparent 61%);mix-blend-mode:screen;opacity:var(--hero-graze-opacity,0);border-radius:48%;position:absolute;inset:16% 7% 11% 48%}.hero-copy{left:max(var(--gutter), calc((100% - 1560px) / 2));width:min(47%,680px);position:absolute;top:50%;transform:translateY(-42%)}.hero h1{letter-spacing:-.045em;font-size:clamp(76px,7.8vw,132px);line-height:.92}.hero h1 em{color:#e0bdab;display:block}.hero-copy>p{color:#bfaeb0;max-width:355px;margin-top:32px;font-size:16px;line-height:1.75}.primary-link{align-items:center;gap:28px;min-height:56px;margin-top:35px;font-size:14px;line-height:1.4;display:inline-flex}.primary-link>span{border:1px solid #baa08c77;border-radius:50%;place-items:center;width:51px;height:51px;transition:background .2s,color .2s;display:grid}.primary-link:hover>span{background:var(--ivory);color:var(--ink)}.primary-link>span .icon{width:21px}.hero-footer{left:var(--gutter);right:var(--gutter);justify-content:space-between;align-items:flex-end;gap:30px;font-size:12px;line-height:1.6;display:flex;position:absolute;bottom:83px}.hero-footer p>span{color:var(--muted);font-size:11px}.scroll-cue{align-items:center;gap:22px;min-height:44px;display:flex}.scroll-cue .icon{height:34px}.hero-edition{letter-spacing:.025em;color:var(--muted);font-size:11px}.media-fallback{z-index:-2;opacity:.8;align-items:center;display:grid;position:absolute;inset:5% 2% 5% 45%}.hero-fallback{inset:14% 3% 10% 46%}.hero-fallback .anatomy-svg{max-height:650px}:is(.hero-fallback:has(+picture[data-asset-state=ready]),.material-fallback:has(+picture[data-asset-state=ready]),.ending-fallback:has(+picture[data-asset-state=ready])){opacity:0}.opening-observation{grid-template-columns:1fr 1fr;gap:55px 85px;padding-block:110px 80px;display:grid}.opening-copy .content-beats{border-top:0;margin-top:60px;padding-top:0;display:block}.opening-copy .beat+.beat{margin-top:42px}.opening-visual{align-self:center;min-width:0}.torso-figure{margin-bottom:32px;position:relative}.torso-figure img{aspect-ratio:1.65;object-fit:cover;object-position:70% 45%;-webkit-mask-image:linear-gradient(270deg,#000 75%,#0000);mask-image:linear-gradient(270deg,#000 75%,#0000)}.torso-figure figcaption{color:var(--muted);padding:12px 0;font-size:12px}.orientation-plate{margin-top:-15px}.opening-observation>.plate-notes{grid-column:1/-1}.chapter:not(.first-chapter){padding-block:105px 85px}.chapter-light{color:#38252d;--muted:#725a63;--rule:#92757f40;--gold:#865d38;background:#eee7de}.chapter-dark{background:var(--ink)}.chapter-composition{grid-template-columns:minmax(0,.83fr) minmax(0,1.17fr);align-items:start;gap:clamp(45px,7vw,115px);display:grid}.chapter-heading{max-width:680px}.chapter-meta{letter-spacing:.035em;align-items:center;gap:15px;margin-bottom:34px;font-size:12px;line-height:1.5;display:flex}.chapter-number{color:var(--gold);font-variant-numeric:tabular-nums}.meta-line{background:var(--rule);width:58px;height:1px;margin-left:4px}.chapter-heading h2{max-width:670px;font-size:clamp(56px,5.45vw,88px)}.chapter-lead{max-width:420px;color:var(--muted);margin-top:30px;font-size:18px;line-height:1.75}.chapter-visual{min-width:0}.layout-reverse .chapter-composition{grid-template-columns:minmax(0,1.12fr) minmax(0,.88fr)}.layout-reverse .chapter-heading{grid-area:1/2;padding-top:40px}.layout-reverse .chapter-visual{grid-area:1/1}.layout-wide .chapter-composition{display:block}.layout-wide .chapter-heading{grid-template-columns:1.2fr .8fr;gap:5px 60px;max-width:1150px;display:grid}.layout-wide .chapter-meta{grid-column:1/-1}.layout-wide .chapter-heading h2{max-width:750px}.layout-wide .chapter-lead{align-self:end;margin-bottom:7px}.layout-wide .chapter-visual{grid-template-columns:minmax(0,1.2fr) minmax(0,.8fr);align-items:center;gap:70px;margin-top:65px;display:grid}.chapter-material{padding-top:0!important}.material-scene{isolation:isolate;background:var(--deep);height:min(100svh,1050px);min-height:840px;position:relative}.material-art{z-index:-1;position:absolute;inset:0;-webkit-mask-image:linear-gradient(#0000,#000 10% 83%,#0000);mask-image:linear-gradient(#0000,#000 10% 83%,#0000)}.material-art img{object-fit:cover}.material-copy{padding-top:130px}.material-copy .chapter-heading{width:43%;padding-right:20px}.material-copy h2{font-size:clamp(65px,5.65vw,94px)}.material-copy .chapter-lead{max-width:330px}.art-note{bottom:55px;left:var(--gutter);color:#cab4b7;font-size:12px;position:absolute}.material-detail,.final-atlas{grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:65px 100px;padding-top:65px;display:grid}.material-reading .content-beats,.final-reading .content-beats{border-top:0;margin-top:0;padding-top:0;display:block}.material-reading .beat+.beat,.final-reading .beat+.beat{margin-top:42px}.material-detail>.plate-notes,.final-atlas>.plate-notes{grid-column:1/-1}.margin-note{font-family:var(--font-serif);letter-spacing:-.025em;border-left:1px solid var(--gold);color:#d8b4a7;max-width:380px;margin-top:50px;padding-left:25px;font-size:32px;line-height:1.25}.final-chapter{padding-top:0!important}.ending-scene{isolation:isolate;background:var(--deep);height:min(90svh,1000px);min-height:760px;position:relative}.ending-art{z-index:-1;position:absolute;inset:0;-webkit-mask-image:linear-gradient(#000 80%,#0000);mask-image:linear-gradient(#000 80%,#0000)}.ending-copy{padding-top:150px}.ending-copy .chapter-heading{width:45%;max-width:580px}.ending-copy h2{font-size:clamp(64px,6vw,100px)}.ending-copy .chapter-lead{max-width:350px}.site-footer{background:#0e090c;border-top:1px solid #71505a55;padding:100px 0 110px}.footer-top{grid-template-columns:.85fr 1.15fr;gap:80px;padding-bottom:90px;display:grid}.footer-brand{letter-spacing:.12em;font-size:clamp(70px,9vw,145px);font-weight:400;line-height:1}.footer-top h2{font-size:42px}.footer-top p{color:var(--muted);max-width:530px;margin-block:22px;font-size:16px}.footer-index{border-top:1px solid var(--rule);padding-block:40px 65px}.footer-index nav{grid-template-columns:repeat(3,1fr);gap:18px 60px;margin-top:30px;display:grid}.footer-index nav a{align-items:center;gap:18px;min-height:44px;font-size:15px;display:flex}.footer-index nav a span{color:var(--gold);font-size:11px}.footer-index nav a:hover{color:#d6b28a}.sources-section{border-top:1px solid var(--rule);padding-top:45px}.sources-section>p{color:var(--muted);max-width:900px;margin-top:18px;font-size:14px}.source-list{grid-template-columns:1fr 1fr;gap:28px 65px;margin:35px 0 0;padding:0;list-style:none;display:grid}.source-list li{gap:20px;font-size:14px;display:flex}.source-num{color:var(--gold);padding-top:3px;font-size:11px}.source-list a{text-underline-offset:5px;align-items:center;gap:10px;-webkit-text-decoration:underline #c3a39455;text-decoration:underline #c3a39455;display:inline-flex}.source-list .icon{width:15px;height:15px}.source-list p{color:var(--muted);margin-top:7px;font-size:12px;line-height:1.6}.footer-bottom{border-top:1px solid var(--rule);color:#af989f;justify-content:space-between;gap:24px;margin-top:65px;padding-top:35px;font-size:11px;display:flex}}@layer components{.atlas-plate{color:var(--ivory);background:#1b1118;padding:24px 22px 20px;position:relative}.chapter-light .atlas-plate{box-shadow:0 20px 65px #35212b12}.plate-topline{text-transform:uppercase;letter-spacing:.08em;color:#c3a7b0;border-bottom:1px solid #ad809231;justify-content:space-between;gap:18px;padding-bottom:14px;font-size:10px;line-height:1.5;display:flex}.diagram-wrap{margin-block:18px 5px}.atlas-plate figcaption{color:#c1aab1;border-top:1px solid #ad809231;padding-top:12px;font-size:11px;line-height:1.7}.interaction{padding-top:27px}.interaction-heading{justify-content:space-between;align-items:baseline;gap:22px;display:flex}.interaction-heading h3{white-space:normal;font-size:16px}.interaction-heading>p{color:var(--muted);max-width:260px;font-size:12px;line-height:1.6}.interaction-options{flex-wrap:wrap;gap:6px;margin-top:22px;display:flex}.interaction-options button{border:1px solid var(--rule);min-height:46px;padding:10px 16px;font-size:12px;line-height:1.4;transition:color .18s,background .18s,border-color .18s}.interaction-options button:hover{border-color:var(--gold)}.interaction-options button[aria-pressed=true]{background:var(--ivory);color:#38252d;border-color:var(--ivory)}.chapter-light .interaction-options button[aria-pressed=true]{color:var(--ivory);background:#38252d;border-color:#38252d}.result-row{justify-content:space-between;align-items:flex-start;gap:20px;min-height:105px;padding-top:20px;display:flex}.interaction-result{max-width:460px;color:var(--muted);font-size:13px;line-height:1.7}.text-button{text-underline-offset:5px;align-items:center;gap:9px;min-height:44px;padding:5px 0;font-size:13px;line-height:1.5;-webkit-text-decoration:underline #b18e7955;text-decoration:underline #b18e7955;display:inline-flex}.text-button .icon{width:16px;height:16px}.reset-button{white-space:nowrap;margin-top:-9px;font-size:11px}.content-beats{border-top:1px solid var(--rule);grid-template-columns:1fr 1fr;gap:65px;margin-top:65px;padding-top:42px;display:grid}.beat{grid-template-columns:25px minmax(0,1fr);gap:18px;display:grid}.beat-number{color:var(--gold);font-size:11px;line-height:2.5}.beat h3{margin-bottom:16px}.beat p{color:var(--muted);max-width:555px;font-size:16px;line-height:1.85}.plate-notes{border-top:1px solid var(--rule);color:var(--muted);justify-content:space-between;gap:40px;margin-top:45px;padding-top:25px;font-size:12px;line-height:1.75;display:flex}.plate-notes p{max-width:710px}.source-ref{white-space:nowrap;align-items:center;gap:8px;display:inline-flex}.source-ref .icon{width:14px;height:14px}details{font-size:13px}summary{cursor:pointer;min-height:44px;color:var(--muted);padding-block:10px;font-size:12px}.text-alternative{border-top:1px solid var(--rule)}.text-alternative dl{margin-top:14px}.text-alternative dt{margin-top:18px;font-weight:500}.text-alternative dd{color:var(--muted);margin:7px 0 20px}.legend{border-top:1px solid var(--rule);margin-top:5px}.legend p{color:var(--muted);margin-block:8px 14px;font-size:13px}.legend-signal,.legend-flow{vertical-align:middle;border-top:3px dotted #cba66c;width:32px;margin-right:8px;display:inline-block}.legend-flow{border-top:2px solid #b6878b}.story-transition{background:#1b1118;border-block:1px solid #68434f55;height:78svh;min-height:540px;max-height:850px;position:relative}.transition-inner{width:min(100% - var(--gutter) * 2, 1180px);grid-template-rows:auto minmax(0,1fr) auto auto auto;height:100%;margin-inline:auto;padding-block:35px 22px;display:grid;position:relative}.transition-label{z-index:2;align-items:center;gap:40px;display:flex;position:relative}.transition-label>span{color:#d6b794;white-space:nowrap;font-size:12px}.transition-label p{letter-spacing:.015em;color:#b99fa8;font-size:12px}.transition-stage{isolation:isolate;min-height:0;padding:8px;position:relative}.transition-stage>.transition-anchor{object-fit:contain;width:100%;height:100%;overflow:visible}.transition-material{z-index:-1;opacity:calc(.55 * var(--transition-progress,0));position:absolute;inset:0;-webkit-mask-image:radial-gradient(#000 45%,#0000 75%);mask-image:radial-gradient(#000 45%,#0000 75%)}.transition-material img{object-fit:contain}.transition-magnify .transition-anchor{opacity:1}.transition-magnify .transition-material{z-index:2;opacity:1;clip-path:inset(0 max(0%, calc(100% - var(--transition-progress,0) * 200%)) 0 max(0%, calc((var(--transition-progress,0) - .75) * 400%)));background:#130c10;-webkit-mask-image:none;mask-image:none}.transition-magnify .transition-material img{object-fit:contain}.transition-magnify .transition-material:not([data-asset-state=ready]){opacity:0}.transition-magnify .transition-stage:has(.transition-material:not([data-asset-state=ready])) .anchor-target{opacity:1!important;clip-path:none!important;transform:none!important}:is(.transition-magnify .transition-stage:has(.transition-material:not([data-asset-state=ready])) .anchor-source,.transition-magnify .transition-stage:has(.transition-material:not([data-asset-state=ready])) .anchor-common,.transition-magnify .transition-stage:has(.transition-material:not([data-asset-state=ready])) .anchor-trace){opacity:0!important}.transition-magnify .anchor-common{opacity:clamp(0, calc((.8 - var(--transition-progress,0)) * 8), 1)}.transition-magnify .anchor-trace{opacity:clamp(0, calc((.75 - var(--transition-progress,0)) * 8), 1)}.anchor-source,.anchor-target{transform-box:view-box;transform-origin:50%}.anchor-trace{stroke-dasharray:100}.transition-caption{text-align:center;grid-template-columns:1fr;min-height:62px;display:grid;position:relative}.transition-source,.transition-target{font-family:var(--font-serif);color:#e1c6bc;grid-area:1/1;font-size:34px;line-height:1.15}.transition-target{opacity:0}.anchor-caption{color:#c6a78f;padding-top:7px;font-size:12px;line-height:1.5}.transition-stage-label{text-align:center;color:#bea6ad;min-height:22px;margin-top:10px;font-size:12px;line-height:1.6}.transition-continue{color:#c3acb4;justify-self:center;align-items:center;gap:8px;min-height:44px;padding:10px;font-size:11px;display:flex}.transition-continue .icon{width:16px;height:16px}.chapter-progress{z-index:35;height:55px;padding:0 var(--gutter);color:var(--ivory);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#130c10f2;border-top:1px solid #82616e44;align-items:center;gap:32px;position:fixed;bottom:0;left:0;right:0}.progress-current{align-items:center;gap:13px;min-width:205px;font-size:11px;display:flex}[data-current-number]{color:#d4b28f;font-variant-numeric:tabular-nums}.chapter-dots{align-items:center;margin-inline:auto;display:flex}.chapter-dots a{place-items:center;min-width:36px;height:44px;display:grid}.chapter-dots a span{background:#87616c;border-radius:50%;width:4px;height:4px;transition:transform .2s,background .2s}.chapter-dots a[aria-current] span{background:#dfbf9f;transform:scale(1.8)}.chapter-dots a:hover span{background:var(--ivory)}.chapter-total{color:#bca4ac;text-align:right;min-width:205px;font-size:11px}.progress-line{width:100%;height:1px;position:absolute;top:-1px;left:0}.progress-line span{transform-origin:0;height:100%;transform:scaleX(var(--story-progress));background:#c49c78;display:block}dialog{color:var(--ivory);overscroll-behavior:contain;background:#1b1218;border:1px solid #896b7644;width:min(700px,100% - 36px);max-height:90svh;padding:35px 42px;overflow-y:auto;box-shadow:0 30px 120px #0009}dialog::backdrop{-webkit-backdrop-filter:blur(9px);backdrop-filter:blur(9px);background:#080509bd}.dialog-top{justify-content:space-between;align-items:center;gap:20px;margin-bottom:24px;display:flex}.dialog-top p{color:#c4a28b;font-size:12px}.icon-button{border:1px solid #71515c66;border-radius:50%;place-items:center;width:44px;height:44px;display:grid}dialog h2{margin-bottom:30px;font-size:54px;line-height:1.05}.chapters-dialog nav{grid-template-columns:1fr 1fr;gap:0 34px;display:grid}.chapters-dialog nav a{border-top:1px solid #77515f50;align-items:center;gap:13px;min-height:62px;padding:17px 0;display:flex}.chapters-dialog nav a>span{color:#bb9275;font-size:11px}.chapters-dialog nav strong{font-size:14px;font-weight:400}.chapters-dialog nav .icon{width:17px;height:17px;margin-left:auto}.chapters-dialog nav a:hover{color:#dfb789}.dialog-footnote{color:#b99ba7;margin-top:30px;font-size:12px}.about-dialog>p{color:#c2afb5;margin-bottom:22px;font-size:15px;line-height:1.8}.about-dialog h3{margin-block:33px 17px;font-size:18px}.about-actions{flex-wrap:wrap;gap:25px;margin-top:30px;display:flex}.primary-button{background:var(--ivory);color:var(--ink);align-items:center;gap:23px;min-height:48px;padding:13px 20px;font-size:13px;display:flex}.asset-failed{opacity:0!important}.media-error{color:var(--ivory);z-index:3;background:#291a23;border:1px solid #b88e9d55;padding:20px;font-size:13px;position:relative}.hero>.media-error,.material-scene>.media-error,.ending-scene>.media-error{right:var(--gutter);max-width:370px;position:absolute;bottom:80px}.media-error button{border:1px solid #ae8c9655;min-height:44px;margin-top:10px;padding:8px 20px;text-decoration:underline}.media-error button:disabled{cursor:wait;opacity:.6}.noscript-note{color:#38252d;z-index:35;background:#f1e9e1;width:100%;padding:12px 25px;font-size:13px;position:fixed;bottom:0}.dialog-options{border-top:1px solid var(--rule);justify-content:space-between;gap:20px;margin-top:28px;padding-top:17px;display:flex}.anatomy-svg,.transition-anchor{width:100%;height:auto;color:var(--ivory,#f1e9e1);display:block;overflow:visible}.anatomy-svg{max-width:820px;margin-inline:auto}.transition-stage>.transition-anchor{height:100%;min-height:0;max-height:100%;overflow:hidden}.transition-stage:has(>.media-error){grid-template-rows:minmax(0,1fr) auto;gap:8px;display:grid}.transition-stage>.media-error{z-index:5;align-items:center;gap:12px;max-width:none;padding:10px 12px;font-size:12px;line-height:1.5;display:flex;position:relative;inset:auto}.transition-stage>.media-error p{flex:1}.transition-stage>.media-error button{flex:none;margin-top:0;padding-inline:12px}.anatomy-svg text,.transition-anchor text{font-family:var(--font-sans,"DM Sans", sans-serif);fill:#eee2da}.svg-label{letter-spacing:-.02em;font-size:19px;font-weight:400}.svg-small{font-size:18px}.svg-title{font-size:34px;font-family:var(--font-serif,"Cormorant Garamond", Georgia, serif)!important}.svg-note{font-size:15px;fill:#c2afb0!important}.svg-micro{letter-spacing:.11em;font-size:12px;font-weight:500}.svg-muted{fill:#ab969a!important}.svg-internal{fill:#eeded6;letter-spacing:.04em;font-size:25px;font-weight:400}.svg-leader{fill:none;stroke:#ab8f91;stroke-width:1px}.svg-leader-dot{fill:#d5b3a3}.svg-rule{stroke:#9b7c81;stroke-width:.75px;opacity:.5}.myocardial-fibers{stroke:#ddb1ae;stroke-width:.8px;fill:none;opacity:.22}.trabeculae{stroke:#b57482;stroke-width:4px;stroke-linejoin:round;fill:none;opacity:.52}.valve-chordae{stroke:#ead6c6;stroke-width:1.5px;fill:none;opacity:.85}.outflow-cusps{fill:none;stroke:#e3c3b3;stroke-width:4px}.route-slate,.route-rose{fill:none;stroke-linejoin:round;stroke-linecap:round;stroke-width:3.5px}.route-slate{stroke:#9ec9d0}.route-rose{stroke:#e5a19f}.electrical-routes{stroke:#ddbd86;stroke-width:2.8px;stroke-dasharray:2 7;stroke-linecap:round;fill:none}.electrical-routes .electrical-node{fill:#edcf93;stroke:none}.electrical-routes .electrical-node-ring{stroke-width:1.5px;stroke-dasharray:none;fill:#372721}.blood-routes,.electrical-routes,[data-chamber],[data-wall],[data-route],[data-gas]{transition:opacity .28s,filter .28s,stroke .28s}.diagram--chambers[data-mode=ra] [data-chamber]:not([data-chamber=ra]),.diagram--chambers[data-mode=rv] [data-chamber]:not([data-chamber=rv]),.diagram--chambers[data-mode=la] [data-chamber]:not([data-chamber=la]),.diagram--chambers[data-mode=lv] [data-chamber]:not([data-chamber=lv]){opacity:.32}.diagram--chambers[data-mode=ra] [data-chamber=ra],.diagram--chambers[data-mode=rv] [data-chamber=rv],.diagram--chambers[data-mode=la] [data-chamber=la],.diagram--chambers[data-mode=lv] [data-chamber=lv]{stroke:#ffe0af;stroke-width:5px;filter:drop-shadow(0 0 10px #cba66c45)}.diagram--chambers[data-mode=right] [data-chamber=la],.diagram--chambers[data-mode=right] [data-chamber=lv],.diagram--chambers[data-mode=left] [data-chamber=ra],.diagram--chambers[data-mode=left] [data-chamber=rv]{opacity:.25}.diagram--signal[data-mode=electrical] [data-layer=blood],.diagram--overview[data-mode=electrical] [data-layer=blood],.diagram--signal[data-mode=blood] [data-layer=electrical],.diagram--overview[data-mode=blood] [data-layer=electrical]{opacity:0}.diagram--signal .heart-shell,.diagram--overview .heart-shell{opacity:.75}.diagram--return [data-route=pulmonary-return],.diagram--return [data-route=aortic-out],.diagram--return [data-route=pulmonary-out]{opacity:.08}.diagram--return[data-mode=body] [data-route=systemic-return]{stroke-width:4.5px}.diagram--return [data-chamber=la],.diagram--return [data-chamber=lv],.diagram--return [data-wall=left],.diagram--return [data-vessel=aorta],.diagram--return [data-vessel=pulmonary-veins],.diagram--return [data-vessel=pulmonary-trunk]{opacity:.3}.diagram--return [data-return-segment]{opacity:.12;transition:opacity .22s,stroke-width .22s}.diagram--return[data-mode=body] [data-return-segment=entry],.diagram--return[data-mode=cavae] [data-return-segment=entry],.diagram--return[data-mode=ra] [data-return-segment=atrium],.diagram--return[data-mode=rv] [data-return-segment=valve],.diagram--return[data-mode=rv] [data-return-segment=ventricle]{opacity:1;stroke-width:4.8px}.diagram--return[data-mode=ra] [data-return-segment=entry],.diagram--return[data-mode=rv] [data-return-segment=atrium]{opacity:.35}.diagram--return[data-mode=cavae] [data-vessel=cavae]{stroke:#e2eeeb;stroke-width:4px}.diagram--return[data-mode=ra] [data-chamber=ra],.diagram--return[data-mode=rv] [data-chamber=rv]{stroke:#ffe0af;stroke-width:5px}.valve-family--outflow,.diagram--valves[data-mode=outflow] .valve-family--av{display:none}.diagram--valves[data-mode=outflow] .valve-family--outflow{display:inline}.lung-lobes{fill:none;stroke:#d49ca3;stroke-width:1.3px;opacity:.5}.airway-branches{fill:none;stroke:#c4b8ad;stroke-width:7px;stroke-linecap:round;opacity:.3}.pulmonary-branch{stroke-width:5px}.diagram--lungs[data-mode=right-lung] [data-route=left-lung],.diagram--lungs[data-mode=left-lung] [data-route=right-lung]{opacity:.14}.gas-arrow{fill:none;stroke-width:5px}.gas-oxygen .gas-arrow{stroke:#ddbd86}.gas-carbon .gas-arrow{stroke:#9ec9d0;stroke-dasharray:9 6}.gas-symbol{font-size:37px;font-family:var(--font-serif,Georgia, serif)!important}.gas-oxygen text{fill:#e9ce9c}.gas-carbon text{fill:#b5d4db}.diagram--exchange[data-mode=oxygen] [data-gas=carbon],.diagram--exchange[data-mode=carbon] [data-gas=oxygen]{opacity:.12}.diagram--pulmonary-return [data-route=aortic-out],.diagram--pulmonary-return [data-route=pulmonary-out],.diagram--pulmonary-return[data-mode=systemic] [data-route=pulmonary-return],.diagram--pulmonary-return[data-mode=pulmonary] [data-route=systemic-return]{opacity:.08}.diagram--pulmonary-return[data-mode=systemic] [data-chamber=ra],.diagram--pulmonary-return[data-mode=pulmonary] [data-chamber=la],.diagram--pulmonary-return[data-mode=pulmonary] [data-chamber=lv]{stroke:#edc2a5;stroke-width:4px}.diagram--walls [data-layer=blood]{opacity:.15}.diagram--walls[data-mode=left] [data-wall=left],.diagram--walls[data-mode=right] [data-wall=right]{stroke:#ffe0af;stroke-width:4px;filter:drop-shadow(0 0 8px #d79c5c44)}.diagram--walls[data-mode=outflow] [data-layer=blood]{opacity:1}.diagram--walls[data-mode=outflow] [data-route]:not([data-route=aortic-out]){opacity:.08}.body-structures{fill:#343037;stroke:#6d5c65;stroke-width:1px;opacity:.65}.systemic-arteries,.systemic-veins{stroke-width:3.5px}.tissue-beds{fill:none;stroke:#ddbd86;stroke-width:2px}.body-heart-label{fill:#f5dfcf;font-size:15px}.diagram--systemic[data-mode=arterial] [data-route=venous],.diagram--systemic[data-mode=venous] [data-route=arterial]{opacity:.12}.anchor-trace{fill:none;stroke:#d5b17d;stroke-width:2px;stroke-linejoin:round;stroke-linecap:round}.transition-anchor .anchor-target{opacity:var(--target-opacity,1)}.transition-anchor .anchor-source{opacity:var(--source-opacity,1)}.diagram-key{display:none}.signal-reading{border-top:1px solid #80606b66;margin-top:18px;padding-top:20px}.signal-steps{grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin:0;padding:0;list-style:none;display:grid}.signal-steps li{align-items:flex-start;gap:10px;display:flex}.signal-step-number{color:#d9b883;font-size:12px;line-height:1.8}.signal-steps strong{font-size:15px;font-weight:500;line-height:1.4;display:block}.signal-steps small{color:#bfaab2;margin-top:5px;font-size:13px;line-height:1.6;display:block}.signal-blood-reading{color:#dfb7ba;font-size:15px;line-height:1.7;display:none}.signal-reading .signal-clock-note{color:#bfaab2;margin-top:17px;font-size:13px;line-height:1.7}.signal-plate[data-mode=blood] .signal-steps{display:none}.signal-plate[data-mode=blood] .signal-blood-reading,.signal-plate[data-mode=both] .signal-blood-reading{display:block}.signal-plate[data-mode=both] .signal-blood-reading{margin-top:18px}@media (width<=600px){.anatomy-svg .svg-micro{letter-spacing:.035em;font-size:14px}.anatomy-svg .svg-label{font-size:22px}.anatomy-svg .svg-title{font-size:38px}.anatomy-svg .svg-note{font-size:17px}.anatomy-svg .svg-internal{font-size:32px}.anatomy-svg .chamber-callouts{display:none}.anatomy-svg .orientation-labels .svg-micro{font-size:15px}.anatomy-svg .orientation-labels .svg-muted{display:none}.diagram--return .svg-small,.diagram--walls .svg-small,.diagram--signal .svg-small{font-size:19px}.diagram--exchange .gas-symbol{font-size:42px}.anatomy-svg .svg-leader,.anatomy-svg .svg-leader-dot,.anatomy-svg .svg-note,.diagram--return .svg-small,.diagram--return .svg-micro,.diagram--pulmonary-return .svg-small,.diagram--pulmonary-return .svg-micro,.diagram--walls .svg-small,.diagram--walls .svg-micro,.diagram--systemic .svg-small,.diagram--systemic .svg-micro,.diagram--valves .svg-micro,.diagram--signal .signal-callouts .svg-small,.diagram--signal .signal-callouts .svg-micro,.diagram--overview .signal-callouts .svg-small,.diagram--overview .signal-callouts .svg-micro,.diagram--exchange .svg-small,.diagram--exchange .svg-micro{display:none}.diagram--lungs .svg-small{font-size:25px}.diagram-key{color:var(--ivory,#f1e9e1);font:400 16px/1.55 var(--font-sans,"DM Sans", sans-serif);text-align:left;border-top:1px solid #73565d70;gap:.65rem;margin:1rem 0 0;padding:1.1rem 0 0;list-style:none;display:grid}.diagram-key li{margin:0;padding:0}.signal-plate .diagram-key{display:none}.signal-steps{grid-template-columns:1fr;gap:15px}.signal-steps strong{font-size:16px}.signal-steps small,.signal-reading .signal-clock-note{font-size:14px}.signal-blood-reading{font-size:16px}}@media (prefers-reduced-motion:reduce){.anatomy-svg *{transition:none!important}}[data-motion=reduced] .anatomy-svg *{transition:none!important}}@layer responsive{@media (width>=2000px){.hero-art,.ending-art,.material-art{max-width:2200px;margin-inline:auto}.chapter-progress{padding-inline:max(var(--gutter), calc((100% - 1560px) / 2))}}@media (width<=1150px){.brand-subtitle{display:none}.chapter-composition{grid-template-columns:.85fr 1.15fr;gap:45px}.chapter-heading h2{font-size:64px}.material-detail,.final-atlas{gap:40px}.opening-observation{gap:50px}.interaction-heading{display:block}.interaction-heading p{max-width:none;margin-top:9px}.progress-current,.chapter-total{min-width:160px}.chapter-dots a{min-width:28px}.material-copy h2{font-size:70px}}@media (width<=900px){.site-header{gap:20px;min-height:82px}.about-button,.js .about-button{display:none!important}.header-actions{gap:22px}.hero{min-height:740px}.hero-copy{width:48%}.hero h1{font-size:78px}.hero-copy>p{max-width:295px}.hero-footer{bottom:70px}.hero-edition{display:none}.opening-observation{grid-template-columns:1fr}.opening-copy .content-beats{grid-template-columns:1fr 1fr;gap:35px;margin-top:40px;display:grid}.opening-copy .beat+.beat{margin-top:0}.opening-visual{grid-template-columns:1fr 1fr;gap:30px;display:grid}.opening-visual .torso-figure{grid-area:1/1;align-self:center}.opening-visual .orientation-plate{grid-area:1/2}.opening-visual .interaction{grid-column:1/-1}.chapter-composition,.layout-reverse .chapter-composition{grid-template-columns:1fr}.chapter-heading{max-width:650px}.chapter-heading h2{font-size:74px}.chapter-lead{max-width:560px}.chapter-visual{width:100%;max-width:760px;margin-inline:auto}.layout-reverse .chapter-heading,.layout-reverse .chapter-visual{grid-area:auto;padding-top:0}.layout-wide .chapter-heading,.layout-wide .chapter-visual{display:block}.layout-wide .chapter-heading .chapter-lead{margin-top:30px}.layout-wide .chapter-visual{margin-top:45px}.content-beats{gap:35px}.material-detail,.final-atlas{grid-template-columns:1fr}.material-reading .content-beats,.final-reading .content-beats{display:grid}.material-reading .beat+.beat,.final-reading .beat+.beat{margin-top:0}.margin-note{max-width:550px;font-size:35px}.material-copy .chapter-heading{width:44%}.material-copy h2{font-size:63px}.material-scene{min-height:780px}.material-art img{object-fit:contain;object-position:center bottom}.ending-copy h2{font-size:70px}.ending-copy .chapter-heading{width:48%}.chapter-total{display:none}.chapter-dots{margin-right:0}.footer-top{gap:40px}.footer-brand{font-size:76px}.footer-top h2{font-size:34px}}@media (width<=640px){body{font-size:16px}.site-header{gap:10px;min-height:76px;padding-block:12px}.wordmark{letter-spacing:.13em;gap:7px;font-size:19px}.wordmark svg{width:25px;height:30px}.header-actions{gap:15px}.header-button{gap:6px;font-size:11px}.motion-button,.js .motion-button{display:none!important}.sound-button .icon{width:14px;height:14px}.chapters-button{border:0;gap:8px;padding-left:0}.chapters-button .icon{width:19px}.hero{height:100svh;min-height:844px;max-height:none}.hero-art{inset:180px 0 18px;-webkit-mask-image:linear-gradient(#0000,#000 15% 95%,#0000);mask-image:linear-gradient(#0000,#000 15% 95%,#0000)}.hero-art img{object-fit:contain;object-position:bottom center}.hero-art:after{inset:39% 13% 10% 17%}.hero-fallback{inset:360px 20px 90px}.hero-copy{top:112px;left:var(--gutter);right:var(--gutter);width:auto;transform:none}.hero h1{letter-spacing:-.045em;max-width:480px;font-size:clamp(48px,14.3vw,76px);line-height:.98}.hero h1 em{display:inline}.hero-copy>p{max-width:325px;margin-top:21px;font-size:14px;line-height:1.7}.hero-copy .primary-link{gap:20px;margin-top:18px;font-size:13px}.primary-link>span{width:43px;height:43px}.hero-footer{align-items:flex-end;gap:14px;font-size:10px;bottom:67px}.hero-footer p>span{font-size:9px}.scroll-cue{gap:6px;font-size:10px}.scroll-cue .icon{width:16px;height:26px}.opening-observation{gap:40px;padding-block:70px 50px}.opening-copy .content-beats{grid-template-columns:1fr;gap:28px;margin-top:35px}.opening-visual{display:block}.torso-figure img{aspect-ratio:1.4}.orientation-plate{margin-top:20px}.chapter:not(.first-chapter){padding-block:65px 55px}.chapter-meta{gap:12px;margin-bottom:24px;font-size:11px}.chapter-heading h2{font-size:clamp(47px,13vw,65px);line-height:1.02}.chapter-lead{margin-top:22px;font-size:16px;line-height:1.8}.chapter-composition{gap:34px}.atlas-plate{margin-inline:-8px;padding:17px 11px 15px}.plate-topline{letter-spacing:.025em;gap:10px;padding-bottom:10px;font-size:9px}.atlas-plate figcaption{padding-inline:4px;font-size:11px}.diagram-wrap{margin-top:18px}.interaction{padding-top:22px}.interaction-heading h3{font-size:17px}.interaction-heading p{font-size:13px;line-height:1.7}.interaction-options{gap:7px;margin-top:18px}.interaction-options button{flex-grow:1;min-height:46px;padding:10px 13px;font-size:12px}.result-row{gap:10px;min-height:110px}.interaction-result{font-size:13px}.reset-button{gap:4px;font-size:11px}.reset-button .icon{width:13px}.content-beats{grid-template-columns:1fr;gap:29px;margin-top:40px;padding-top:30px}.beat{grid-template-columns:20px minmax(0,1fr);gap:12px}.beat h3{margin-bottom:12px;font-size:18px}.beat p{font-size:16px;line-height:1.85}.plate-notes{flex-direction:column;gap:15px;margin-top:30px;font-size:11px}.source-ref{min-height:36px}.material-scene{height:auto;min-height:790px}.material-copy{padding-top:75px}.material-copy .chapter-heading{width:100%;padding-right:0}.material-copy h2{font-size:clamp(48px,12.8vw,66px)}.material-copy .chapter-lead{max-width:none}.material-art{height:385px;inset:auto 0 30px;-webkit-mask-image:linear-gradient(#0000,#000 16% 85%,#0000);mask-image:linear-gradient(#0000,#000 16% 85%,#0000)}.material-art img{object-fit:cover;object-position:76% 50%}.material-fallback{inset:400px 20px 50px}.art-note{font-size:10px;bottom:25px}.material-detail,.final-atlas{gap:42px;padding-top:35px}.material-reading .content-beats,.final-reading .content-beats{grid-template-columns:1fr}.margin-note{margin-top:33px;padding-left:20px;font-size:29px}.ending-scene{height:100svh;min-height:925px;max-height:none}.ending-copy{padding-top:75px}.ending-copy .chapter-heading{width:100%}.ending-copy h2{font-size:61px}.ending-copy .primary-link{margin-top:25px;font-size:12px}.ending-art{inset:300px 0 15px}.ending-art img{object-fit:contain;object-position:center bottom}.ending-fallback{inset:450px 20px 50px}.story-transition{height:65svh;min-height:460px;max-height:650px}.transition-inner{width:calc(100% - 32px);padding-block:25px 10px}.transition-label{gap:20px;padding-inline:8px}.transition-label>span{font-size:10px}.transition-label p{font-size:10px;line-height:1.5}.transition-stage{margin-block:10px;padding:0}.transition-caption{min-height:56px}.transition-source,.transition-target{font-size:29px}.anchor-caption{max-width:320px;margin-inline:auto;padding-inline:6px;font-size:10px}.transition-stage-label{max-width:340px;min-height:34px;margin-inline:auto;padding-inline:8px;font-size:11px}.transition-continue{font-size:10px}.chapter-progress{gap:5px;height:49px;padding-inline:20px}.progress-current{gap:9px;min-width:0;font-size:10px}.progress-current [data-current-title]{white-space:nowrap;text-overflow:ellipsis;max-width:150px;overflow:hidden}.chapter-dots{gap:0;margin-left:auto}.chapter-dots a{min-width:15px;height:44px}.chapter-dots a span{width:3px;height:3px}dialog{width:calc(100% - 24px);max-height:92svh;padding:20px 23px 27px}dialog h2{font-size:44px}.dialog-top{margin-bottom:15px}.chapters-dialog nav{grid-template-columns:1fr}.chapters-dialog nav a{min-height:51px;padding-block:12px}.chapters-dialog nav strong{font-size:15px}.about-dialog>p{font-size:14px}.site-footer{padding-block:65px 95px}.footer-top{grid-template-columns:1fr;gap:35px;padding-bottom:40px}.footer-brand{font-size:80px}.footer-top h2{font-size:38px}.footer-index nav{grid-template-columns:1fr 1fr;gap:8px 20px}.footer-index nav a{gap:9px;font-size:12px}.source-list{grid-template-columns:1fr;gap:26px}.footer-bottom{flex-direction:column;gap:10px;font-size:10px}.hero>.media-error,.material-scene>.media-error,.ending-scene>.media-error{max-width:none;font-size:12px;bottom:75px;left:20px;right:20px}}@media (width<=359px){:root{--gutter:20px}.wordmark{font-size:17px}.wordmark svg{width:21px}.header-actions{gap:10px}.sound-button .icon{display:none}.chapters-button{gap:5px}.hero-copy{top:110px}.hero h1{font-size:47px}.progress-current [data-current-title]{max-width:115px}.chapter-dots a{min-width:13px}}@media (height<=600px) and (width>=641px){.hero{min-height:700px}.site-header{min-height:65px;padding-block:8px}.hero-copy{transform:translateY(-40%)}.material-scene{min-height:720px}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}[data-motion=reduced] *,[data-motion=reduced] :before,[data-motion=reduced] :after{transition:none!important;animation:none!important}@media print{.site-header,.chapter-progress,.story-transition,.header-actions,.interaction-options,.reset-button,dialog{display:none!important}body{color:#222;background:#fff}.chapter{break-inside:avoid}.hero,.material-scene,.ending-scene{height:500px;min-height:500px}.section-container{width:100%}.chapter-light,.chapter-dark{color:#222;background:#fff}p{color:#333!important}.source-list{display:block}.source-list li{margin-bottom:15px}}}.media-fallback[aria-hidden=true] .diagram-key{display:none}.hero-fallback,.material-fallback,.ending-fallback,.transition-magnify .transition-material{transition:opacity .7s}@media (prefers-reduced-motion:reduce){.hero-fallback,.material-fallback,.ending-fallback,.transition-magnify .transition-material{transition:none}}