@font-face{font-family:"Source Serif 4";src:url("/assets/fonts/SourceSerif4-Regular.woff2") format("woff2");font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:"Source Serif 4";src:url("/assets/fonts/SourceSerif4-Semibold.woff2") format("woff2");font-weight:600;font-style:normal;font-display:swap}
@font-face{font-family:"Source Serif 4";src:url("/assets/fonts/SourceSerif4-Bold.woff2") format("woff2");font-weight:700 900;font-style:normal;font-display:swap}
@font-face{font-family:"Source Sans 3";src:url("/assets/fonts/SourceSans3-Regular.woff2") format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"Source Sans 3";src:url("/assets/fonts/SourceSans3-Semibold.woff2") format("woff2");font-weight:600 900;font-display:swap}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--paper);color:var(--ink);font-family:"Source Serif 4",Georgia,serif;-webkit-font-smoothing:antialiased}button,input{font:inherit}a{color:inherit;text-decoration:none}a:hover{color:var(--orangeText)}a:focus-visible,button:focus-visible,input:focus-visible{outline:2px solid var(--orangeText);outline-offset:5px}button{color:inherit;cursor:pointer}img{display:block;max-width:100%;height:auto}h1,h2,h3,p{margin:0}h1,h2,h3{font-weight:600;letter-spacing:-.035em;text-wrap:balance}p{text-wrap:pretty}svg{flex-shrink:0;vertical-align:middle}button{background:none;border:0;padding:0}figure{margin:0}.page-width{width:calc(100% - 96px);max-width:var(--page-max);margin-inline:auto}.skip-link{position:absolute;left:16px;top:-100px;padding:12px;background:var(--ink);color:white;z-index:10}.skip-link:focus{top:12px}.publication-note{display:flex;align-items:center;justify-content:space-between;gap:16px;background:var(--surface);padding:8px 48px;font:13px/1.3 "Source Sans 3",sans-serif;letter-spacing:.02em}.publication-note a{text-decoration:underline;text-underline-offset:3px}.masthead{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;padding:28px 0 24px}.brand{font-weight:700;font-size:66px;line-height:1;letter-spacing:-4px;text-align:center}.brand:hover{color:var(--ink)}.brand span{display:block;font-size:19px;font-weight:400;letter-spacing:-.4px;line-height:1.5;margin-top:5px}.masthead-side{font:14px/1.4 "Source Sans 3",sans-serif;color:var(--muted)}.masthead-side.right{justify-self:end;display:flex;flex-direction:column;align-items:flex-end;gap:8px}.masthead-side.right a{min-height:32px;display:flex;align-items:center;gap:8px}.membership-link{color:var(--orangeText)}.main-nav{display:flex;justify-content:space-between;align-items:center;gap:20px;border-block:1px solid var(--ink);min-height:53px;font:16px/1 "Source Sans 3",sans-serif}.nav-links{display:flex;gap:32px;align-items:center;flex-wrap:wrap}.nav-links a{display:flex;min-height:51px;align-items:center;border-bottom:2px solid transparent;padding-top:2px}.nav-links a[aria-current]{border-bottom-color:var(--orange);font-weight:600}.search-link{display:flex;align-items:center;gap:8px;min-height:48px}.mobile-menu{display:none}.eyebrow,.component-label,.section-label,.story-meta,.art-caption,figcaption,.read-story,.text-link,.reading-aside,.breadcrumbs,.article-byline,.sample-note,.chain-progress,.advertisement,.scene-index,.save-button,.share-button,.results-status,.search-form,.empty-state p,.footer-bottom{font-family:"Source Sans 3",Arial,sans-serif}.eyebrow{display:block;font-size:12px;font-weight:600;line-height:1.4;text-transform:uppercase;letter-spacing:.14em;color:var(--orangeText)}.eyebrow span{color:var(--muted);font-weight:400;margin-left:16px;letter-spacing:.08em}.connected-feature{padding-top:24px}.connected-feature h1{font-size:clamp(44px,5.9vw,91px);line-height:1.04;margin:16px 0 12px;letter-spacing:-.055em}.feature-deck{font-size:clamp(21px,2.15vw,34px);line-height:1.3;letter-spacing:-.035em;color:var(--muted)}.chain-art{position:relative;margin:16px 0 0}.chain-panorama{width:100%;height:clamp(200px,25vw,380px);object-fit:cover;object-position:center;mix-blend-mode:multiply}.chain-hotspots{position:absolute;inset:0;display:grid;grid-template-columns:repeat(5,1fr);align-items:stretch}.chain-hotspots a{position:relative;border-bottom:2px solid transparent;transition:background-color .18s,border-color .18s}.chain-hotspots a:hover,.chain-hotspots a:focus-visible,.chain-hotspots a.active{background:rgb(232 90 36 / 4%);border-bottom-color:var(--orange)}.chain-hotspots a>span{position:absolute;bottom:0;left:8px;font:600 13px/32px "Source Sans 3",sans-serif;width:32px;height:32px;border:1px solid var(--orangeText);background:var(--paper);text-align:center;color:var(--orangeText)}.chain-index{list-style:none;padding:0;margin:20px 0 0;display:grid;grid-template-columns:repeat(5,1fr);gap:24px}.chain-index>li{min-width:0}.component-label{font-size:11px;text-transform:uppercase;letter-spacing:.13em;font-weight:600;display:flex;align-items:center;gap:10px;line-height:1.4}.component-label span{font-family:"Source Serif 4",serif;color:var(--orangeText);font-size:25px;letter-spacing:-1px}.chain-index h2{font-size:clamp(22px,2vw,31px);line-height:1.12;margin:10px 0 10px}.chain-index p{font-size:17px;line-height:1.45;color:var(--muted)}.read-story{display:flex;gap:6px;align-items:center;margin-top:12px;font-size:13px;color:var(--orangeText);min-height:28px}.chain-index>li.active h2{color:var(--orangeText)}.mobile-chain-art{display:none}.art-caption,figcaption{font-size:12px;line-height:1.5;color:var(--muted);margin-top:14px}.art-caption a{text-decoration:underline;text-underline-offset:3px}.newsroom-strip{display:grid;grid-template-columns:1.05fr 1fr 1fr 1fr;gap:24px;padding:24px 0;border-block:1px solid var(--ink);margin:28px 0}.newsroom-strip>article{border-left:1px solid var(--rule);padding-left:24px}.newsroom-strip h2{font-size:27px;line-height:1.15;margin-top:8px}.newsroom-strip h3{font-size:25px;line-height:1.18;margin-top:10px}.story-meta{display:flex;gap:8px;align-items:center;flex-wrap:wrap;font-size:12px;line-height:1.5;color:var(--muted)}.story-meta>a{color:var(--orangeText);font-weight:600}.story-meta span+span:before{content:"·";margin-right:8px}.newsroom-strip .story-meta span:nth-child(2){display:none}.advertisement{min-height:92px;display:flex;align-items:center;justify-content:center;gap:16px;background:var(--surface);color:var(--muted);font-size:10px;letter-spacing:.14em;text-transform:uppercase;margin:32px 0 48px}.advertisement span+span{border-left:1px solid var(--rule);padding-left:16px}.section-label{display:flex;justify-content:space-between;align-items:center;gap:20px;border-top:2px solid var(--ink);padding-top:12px;margin-bottom:24px;font-size:13px}.section-label h2{font:600 13px/1.4 "Source Sans 3",sans-serif;text-transform:uppercase;letter-spacing:.12em}.section-label>span{color:var(--muted)}.section-label a{display:flex;gap:8px;align-items:center;min-height:30px}.working-grid{display:grid;grid-template-columns:1fr 1.9fr;gap:24px;align-items:center}.working-copy h2{font-size:clamp(38px,4.8vw,72px);line-height:1.01;margin:20px 0;letter-spacing:-.05em}.working-copy h2 em{font-weight:400;color:var(--orangeText)}.working-copy p{font-size:20px;line-height:1.5;max-width:32ch;color:var(--muted)}.working-image img{mix-blend-mode:multiply;width:100%;aspect-ratio:1.6;object-fit:contain}.text-link{display:inline-flex;align-items:center;gap:12px;min-height:44px;margin-top:18px;border-bottom:1px solid var(--orangeText);font-size:15px;color:var(--orangeText)}.scene-index{display:flex;gap:24px;justify-content:flex-end;border-top:1px solid var(--rule);padding:16px 0;font-size:13px;color:var(--muted)}.scene-index b{color:var(--orangeText);font-weight:600;margin-right:8px}.working-feature{margin-bottom:48px}.two-features{display:grid;grid-template-columns:1.1fr 1fr;gap:36px;border-block:1px solid var(--ink);padding:32px 0;margin:32px 0 48px}.two-features h2{font-size:clamp(30px,3vw,46px);line-height:1.08}.two-features p{font-size:18px;line-height:1.5;color:var(--muted);margin-top:16px}.anatomy-teaser-grid{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:12px;margin-top:20px}.anatomy-teaser-grid img{width:100%;height:330px;object-fit:contain;mix-blend-mode:multiply}.atlas-teaser{border-left:1px solid var(--rule);padding-left:36px}.atlas-teaser>a>img{height:200px;width:100%;object-fit:contain;mix-blend-mode:multiply}.atlas-teaser h2{margin-top:12px}.reading-columns{display:grid;grid-template-columns:repeat(2,1fr);column-gap:48px}.story-row{display:flex;gap:20px;padding:24px 0;border-bottom:1px solid var(--rule);align-items:flex-start}.story-row>div{flex:1;min-width:0}.story-row h3{font-size:27px;line-height:1.16;margin:8px 0}.story-row p{font-size:17px;line-height:1.5;color:var(--muted);max-width:54ch}.save-button,.share-button{display:inline-flex;align-items:center;justify-content:center;gap:7px;min-width:44px;min-height:44px;font-size:13px;white-space:nowrap;flex-shrink:0}.save-button[aria-pressed=true]{color:var(--orangeText)}.save-button[aria-pressed=true] svg{fill:var(--orangeText)}.story-row .save-button span{display:none}.save-button:hover,.share-button:hover{color:var(--orangeText)}.membership-band{margin:64px 0 0;border-block:1px solid var(--ink);padding:36px 0;display:flex;justify-content:space-between;align-items:center;gap:32px}.membership-band h2{font-size:40px;line-height:1.15;margin:12px 0}.membership-band p{font-size:18px;line-height:1.5;color:var(--muted)}.site-footer{display:grid;grid-template-columns:1fr 1fr 1fr;column-gap:40px;padding:48px 0 24px}.footer-brand{font-size:40px;font-weight:700;letter-spacing:-2px}.site-footer>div>p{font-size:16px;margin-top:2px}.footer-statement{font-size:22px;line-height:1.4;letter-spacing:-.025em}.site-footer nav{display:flex;flex-direction:column;gap:4px;align-items:flex-start;font:14px/1.5 "Source Sans 3",sans-serif}.site-footer nav a{display:flex;align-items:center;min-height:36px}.footer-bottom{grid-column:1/-1;display:flex;justify-content:space-between;gap:20px;border-top:1px solid var(--rule);margin-top:36px;padding-top:20px;font-size:12px;color:var(--muted)}.toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%,20px);background:var(--ink);color:var(--paper);padding:14px 22px;max-width:calc(100% - 32px);font:15px/1.4 "Source Sans 3",sans-serif;opacity:0;pointer-events:none;transition:opacity .18s,transform .18s;z-index:20}.toast.visible{opacity:1;transform:translate(-50%,0)}
/* Reading pages */
.breadcrumbs{display:flex;flex-wrap:wrap;gap:10px;font-size:12px;color:var(--muted);padding:24px 0}.breadcrumbs a{min-height:24px}.article-header{max-width:1080px;margin:20px auto 40px}.article-header>.story-meta{font-size:13px}.article-header h1{font-size:clamp(40px,5vw,74px);line-height:1.06;margin:16px 0 24px;max-width:20ch;letter-spacing:-.05em}.article-deck{font-size:26px;line-height:1.45;max-width:64ch;color:var(--muted)}.article-byline{display:flex;justify-content:space-between;align-items:center;gap:24px;border-top:1px solid var(--rule);margin-top:28px;padding-top:16px;font-size:14px}.article-byline small{display:block;color:var(--muted);font-size:12px;margin-top:4px}.article-byline>div{display:flex;gap:24px}.article-reading-layout{display:grid;grid-template-columns:220px minmax(0,720px);justify-content:center;gap:64px;margin:56px 0}.article-body{font-size:20px;line-height:1.65;max-width:65ch}.article-body p+p{margin-top:20px}.article-body .lead{font-size:23px;line-height:1.55}.article-body h2{font-size:31px;line-height:1.2;margin:36px 0 20px;letter-spacing:-.03em}.article-body a:not(.text-link){text-decoration:underline;text-underline-offset:4px}.article-body section{scroll-margin-top:32px}.reading-aside{padding-top:6px;font-size:14px;line-height:1.5;color:var(--muted)}.reading-aside ol{margin:16px 0 32px;padding-left:20px}.reading-aside li{padding:8px 0}.topic-back{display:block;border-top:1px solid var(--rule);padding-top:20px;line-height:1.7}.topic-back strong{font-weight:600;color:var(--ink)}.takeaway{border-left:3px solid var(--orange);padding:4px 0 4px 24px;margin:36px 0}.takeaway p{font-size:24px;line-height:1.4;margin-top:10px}.sample-note{padding:20px 0;border-top:1px solid var(--rule);font-size:13px;line-height:1.55;color:var(--muted)}.sample-note p{margin:8px 0}.chain-progress{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;border-block:1px solid var(--rule);font-size:14px}.chain-progress a{padding:20px 0;display:flex;gap:12px;align-items:center;border-top:2px solid transparent}.chain-progress a span{color:var(--orangeText)}.chain-progress a[aria-current]{border-top-color:var(--orangeText);font-weight:600}.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:32px}.related-grid .story-row{border:0}.related-grid .story-row h3{font-size:26px}.anatomy-layout{display:grid;grid-template-columns:1.1fr 1fr;gap:56px;max-width:1080px;margin:0 auto 48px;border-block:1px solid var(--rule);padding:24px 0}.anatomy-layout figure img{width:100%;height:600px;object-fit:contain;mix-blend-mode:multiply}.anatomy-index{align-self:center}.anatomy-index>a{display:flex;gap:20px;align-items:center;border-bottom:1px solid var(--rule);padding:20px 0;min-height:100px}.index-number{font-size:28px;color:var(--orangeText);align-self:flex-start}.anatomy-index h2{font-size:25px;line-height:1.2}.anatomy-index p{font-size:16px;line-height:1.4;color:var(--muted);margin-top:8px}.anatomy-index>a>div{flex:1}.feature-figure img{max-height:650px;width:100%;object-fit:contain;mix-blend-mode:multiply}.feature-figure figcaption{text-align:center}.illustration-index{display:grid;grid-template-columns:repeat(3,1fr);gap:32px;border-block:1px solid var(--rule);padding:24px 0;margin-top:24px}.illustration-index>a{display:flex;gap:20px}.illustration-index>a>span{font-size:26px;color:var(--orangeText)}.illustration-index h2{font-size:25px}.illustration-index p{font-size:16px;line-height:1.45;color:var(--muted);margin-top:8px}.atlas-layout{display:grid;grid-template-columns:250px 1fr;gap:48px;align-items:center;border-block:1px solid var(--rule);padding:32px 0}.atlas-layout img{width:100%;max-height:560px;object-fit:contain;mix-blend-mode:multiply}.atlas-reading>a{display:block;padding:18px 0;border-bottom:1px solid var(--rule)}.atlas-reading>a>span{font-size:15px;color:var(--orangeText)}.atlas-reading h2{font-size:26px;display:inline;margin-left:12px}.atlas-reading p{font-size:17px;line-height:1.45;color:var(--muted);margin-top:8px}.topic-intro{display:grid;grid-template-columns:1fr 2fr;gap:64px;border-top:1px solid var(--rule);margin-top:40px;padding-top:28px}.topic-intro h2{font-size:32px;line-height:1.15}.topic-intro p{font-size:20px;line-height:1.6}
/* Editions, sections and utility pages */
.section-heading{padding:48px 0 40px;border-bottom:1px solid var(--rule);margin-bottom:24px}.section-heading h1{font-size:clamp(44px,5.8vw,80px);line-height:1.08;margin:16px 0 20px;letter-spacing:-.05em}.section-heading p{font-size:25px;line-height:1.4;max-width:55ch;color:var(--muted)}.section-stories{display:grid;grid-template-columns:1.6fr 1fr;gap:64px;min-height:420px}.section-stories>.story-row{padding-top:24px}.section-stories>aside{padding-top:32px}.section-stories>aside img{aspect-ratio:2.5;object-fit:cover;mix-blend-mode:multiply;margin:24px 0}.section-stories>aside h2{font-size:33px;line-height:1.2}.section-stories>aside p{font-size:18px;color:var(--muted);margin-top:12px}.row-number{font-size:24px;color:var(--orangeText);line-height:1.2}.topics-list>article{display:grid;grid-template-columns:1.4fr 1fr;gap:56px;align-items:center;padding:32px 0;border-bottom:1px solid var(--rule)}.topics-list h2{font-size:40px;line-height:1.1;margin:16px 0}.topics-list p{font-size:21px;line-height:1.5;color:var(--muted)}.topic-image img{width:100%;height:320px;object-fit:contain;mix-blend-mode:multiply}.search-form{max-width:850px;margin:32px auto 24px;font-size:16px}.search-form label{display:block;margin-bottom:10px;font-weight:600}.search-form>div{display:flex}.search-form input{min-width:0;width:100%;background:transparent;border:1px solid var(--ink);padding:16px;color:var(--ink);font-size:20px;border-radius:0}.search-form input::placeholder{color:var(--muted)}.ink-button{padding:14px 24px;background:var(--ink);color:var(--paper);display:flex;align-items:center;gap:12px}.ink-button:hover{background:var(--orangeText)}.search-results,.results-status{max-width:850px;margin-inline:auto}.results-status{font-size:14px;color:var(--muted)}.search-results{min-height:300px}.empty-state{text-align:center;padding:64px 20px}.empty-state h2{font-size:36px;line-height:1.2;margin-bottom:16px}.empty-state p{font-size:18px;line-height:1.6;color:var(--muted)}.error-page h1{font-size:54px;margin:24px 0}.membership-header{padding:64px 0 48px;max-width:1000px}.membership-header h1{font-size:clamp(44px,5.5vw,80px);line-height:1.05;margin:20px 0 24px;letter-spacing:-.05em}.membership-header p{font-size:26px;line-height:1.5;color:var(--muted)}.membership-timeline{display:grid;grid-template-columns:1fr 1fr;border-block:1px solid var(--ink);padding:32px 0;gap:64px}.membership-timeline>div+div{border-left:1px solid var(--rule);padding-left:64px}.timeline-number{display:block;font-size:80px;color:var(--orangeText);line-height:1.2;font-weight:600;letter-spacing:-.07em}.membership-timeline h2{font-size:32px;margin:16px 0}.membership-timeline p{font-size:20px;line-height:1.55;max-width:45ch;color:var(--muted)}.membership-details{display:grid;grid-template-columns:1.3fr 1fr;gap:80px;padding:56px 0}.membership-details h2{font-size:34px;margin:12px 0 20px}.membership-details p{font-size:20px;line-height:1.6;color:var(--muted);margin-bottom:16px}.membership-details aside{background:var(--surface);padding:24px 32px}.about-layout{display:grid;grid-template-columns:230px minmax(0,720px);gap:64px;justify-content:center;padding:32px 0 64px}.about-layout>aside{padding-top:10px}
@media(min-width:1600px){.chain-panorama{height:380px}}
@media(max-width:1100px){.page-width{width:calc(100% - 64px)}.publication-note{padding-inline:32px}.nav-links{gap:22px}.masthead-side{font-size:12px}.brand{font-size:60px}.chain-index{gap:18px}.component-label{font-size:9px;gap:6px}.chain-index p{font-size:16px}.newsroom-strip{gap:20px}.newsroom-strip>article{padding-left:20px}.newsroom-strip h3{font-size:23px}.newsroom-strip h2{font-size:25px}.working-copy p{font-size:18px}.article-reading-layout{grid-template-columns:180px minmax(0,660px);gap:36px}.anatomy-layout{gap:32px}.anatomy-layout figure img{height:530px}.related-grid{gap:24px}.related-grid .save-button{display:none}.section-stories{gap:36px}.about-layout{grid-template-columns:180px minmax(0,1fr);gap:36px}.footer-statement{font-size:20px}.scene-index{justify-content:space-between}.anatomy-teaser-grid{grid-template-columns:1fr}.anatomy-teaser-grid>a{grid-row:1}.anatomy-teaser-grid img{height:240px}.atlas-teaser>a>img{height:260px}.two-features{grid-template-columns:1fr 1fr}.two-features h2{font-size:36px}.atlas-teaser h2{margin-top:20px}}
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@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}

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.chain-hotspots a>span{display:none}.scene-index>a{display:flex;align-items:center;min-height:44px}
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.about-layout .article-body a[href^="mailto:"]{overflow-wrap:anywhere}
.about-layout .article-body section+section{margin-top:36px}
.about-layout .article-body ul{padding-left:24px}
.about-layout .article-body li{margin-block:12px}
.publication-intro{display:grid;grid-template-columns:1.45fr 1fr;gap:64px;padding:40px 0 48px;align-items:end}
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.publication-context{border-left:1px solid var(--rule);padding-left:32px;font-size:19px;line-height:1.6}
.publication-context p+p{margin-top:16px}
.publication-columns{display:grid;grid-template-columns:repeat(3,1fr);gap:32px}
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.publication-columns h3{font-size:29px;line-height:1.2;margin:12px 0}
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@media(max-width:900px){.publication-intro{gap:32px}.publication-context{padding-left:24px}.publication-columns{gap:20px}.publication-columns>div+div{padding-left:20px}.publication-scope{gap:24px}.publication-preview-heading{gap:32px}}
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@media(max-width:600px){.mobile-chain-art{aspect-ratio:3/5}.anatomy-teaser-grid{display:flex;flex-direction:column;align-items:stretch;gap:20px}.anatomy-teaser-grid img{height:280px;width:100%}}