:root{--color-paper:#F2F1EC;--color-ink:#17181A;--color-rust:#B8482A;--color-engineering:#2D57A0;--color-muted:#5B5C60;--color-panel:#E6E4DD;--color-line:rgba(23,24,26,.18);--font-serif:Literata,Georgia,serif;--font-sans:Onest,Arial,sans-serif;--font-mono:'JetBrains Mono',monospace;--space-1:8px;--space-2:16px;--space-3:24px;--space-4:32px;--space-5:48px;--space-6:64px;--space-7:104px;--content-width:680px;--wide-width:1312px;--site-width:1440px;--gutter:64px;--transition:160ms ease;--radius:0}
*,*::before,*::after{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:32px}body{margin:0;background:var(--color-paper);color:var(--color-ink);font:400 16px/1.55 var(--font-sans);overflow-wrap:break-word}body.sd-site{max-width:var(--site-width);margin-inline:auto}img{display:block;max-width:100%;height:auto}svg{display:block;width:100%;height:auto}a{color:inherit;text-decoration:none}a:hover{color:var(--color-rust)}button,input,select,textarea{font:inherit}button{cursor:pointer}button,a,input,select,textarea{touch-action:manipulation}button{border-radius:0}button:disabled{cursor:default}a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid var(--color-engineering);outline-offset:5px}h1,h2,h3,p,figure{margin:0}h1,h2,h3{font-family:var(--font-serif);font-weight:380;letter-spacing:-.03em}h1{font-size:82px;line-height:1.02;text-wrap:balance}h2{font-size:60px;line-height:1.04;text-wrap:balance}h3{font-size:27px;line-height:1.18}p+p{margin-top:1em}small{font-size:.75em}.mono,.eyebrow{font-family:var(--font-mono);font-size:11px;line-height:1.5;font-weight:400;letter-spacing:.025em}.eyebrow{color:var(--color-rust);text-transform:uppercase;display:block;margin-bottom:24px}.rust{color:var(--color-rust)}.blue{color:var(--color-engineering)}.lead{font:400 26px/1.45 var(--font-serif);letter-spacing:-.01em}.section-pad{padding:104px var(--gutter)}.section-margin{margin-inline:var(--gutter)}.section-heading{display:grid;grid-template-columns:2fr 1fr;gap:64px;align-items:end;margin-bottom:40px}.section-heading>p{color:#4A4B4F}.section-heading h2{max-width:880px}.arrow-link{display:inline-flex;gap:24px;align-items:center;justify-content:space-between;padding:10px 0 12px;border-bottom:2px solid var(--color-rust);font:500 18px/1.25 var(--font-sans);max-width:100%}.arrow-link span{color:var(--color-rust)}.screen-reader-text{border:0;clip-path:inset(50%);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute!important;white-space:nowrap;width:1px}.skip-link{position:fixed;top:8px;left:8px;z-index:99999;padding:12px;background:var(--color-ink);color:var(--color-paper);transform:translateY(-200%)}.skip-link:focus{transform:none}.breadcrumbs{display:flex;gap:10px;flex-wrap:wrap;color:var(--color-muted)}
/* Header and navigation — the drawing ruler is part of the approved identity. */
.sd-header{position:relative;z-index:30;background:var(--color-paper)}.header-note{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:10px var(--gutter);border-bottom:1px solid var(--color-line);font:400 11px/1.5 var(--font-mono);color:var(--color-muted)}.header-main{display:grid;grid-template-columns:auto 1fr auto;align-items:end;gap:30px;padding:26px var(--gutter) 17px}.brand{display:flex;align-items:baseline;gap:14px;white-space:nowrap;font:500 38px/.95 var(--font-serif);letter-spacing:-.03em}.brand small{font:400 11px var(--font-mono);color:var(--color-muted);letter-spacing:0}.brand-mark{display:block;align-self:center;flex:none;width:34px;height:40px;border-top:3px solid currentColor;background:linear-gradient(90deg,currentColor 0 2px,transparent 2px 6px,currentColor 6px 7px,transparent 7px 13px,currentColor 13px 15px,transparent 15px 18px,currentColor 18px 19px,transparent 19px 26px,currentColor 26px 28px,transparent 28px 31px,currentColor 31px 32px,transparent 32px)}.desktop-nav{display:flex;gap:24px;justify-content:center;align-items:center}.desktop-nav button{padding:0;background:none;border:0;white-space:nowrap;font:500 15px/1.3 var(--font-sans);position:relative}.roman{font:400 10px/1 var(--font-mono);color:var(--color-muted);margin-right:5px}.desktop-nav button[aria-expanded=true]::after{content:'';position:absolute;left:0;bottom:-25px;width:7px;height:14px;background:var(--color-rust)}.library-link{font:500 14px/1.1 var(--font-sans);margin-left:16px}.header-actions{display:flex;gap:16px;align-items:center}.search-trigger,.all-topics{height:36px;display:flex;align-items:center;gap:10px;padding:7px 12px;border:1px solid var(--color-line);font:500 14px/1 var(--font-sans)}.all-topics{background:var(--color-ink);color:var(--color-paper);border-color:var(--color-ink)}.search-label small{font-family:var(--font-mono);margin-left:6px;color:var(--color-muted)}.search-icon{display:block;width:14px;height:14px;border:1.5px solid currentColor;border-radius:50%}.mobile-label{display:none}.ruler{height:8px;margin-inline:var(--gutter);border-top:2px solid var(--color-ink);background:repeating-linear-gradient(90deg,var(--color-ink) 0 1px,transparent 1px 32px)}.mega-panel{position:absolute;left:var(--gutter);right:var(--gutter);top:100%;padding:42px;background:var(--color-paper);border:1px solid var(--color-ink);border-top:0;display:grid;grid-template-columns:1fr 2fr;gap:64px;box-shadow:0 18px 22px rgba(23,24,26,.08)}.mega-panel[hidden]{display:none}.mega-panel p{max-width:340px;margin-bottom:24px}.mega-links{display:grid;grid-template-columns:1fr 1fr;gap:12px 32px}.mega-links a{display:flex;justify-content:space-between;gap:12px;border-top:1px solid var(--color-line);padding:12px 0;font:400 24px/1.15 var(--font-serif)}.mobile-navigation{border:0;max-width:none;max-height:none;width:min(620px,100vw);height:100dvh;margin:0 0 0 auto;padding:28px 32px;background:var(--color-ink);color:var(--color-paper);overflow-y:auto;overscroll-behavior:contain}.mobile-navigation::backdrop{background:rgba(23,24,26,.4)}.mobile-top{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:30px}.mobile-top .brand{font-size:30px}.mobile-top button{padding:12px 16px;background:var(--color-paper);border:0;color:var(--color-ink);min-height:44px}.mobile-navigation .search-form{margin-bottom:32px;border:1px solid #555;padding:6px}.mobile-navigation input{color:var(--color-paper)}.mobile-navigation details{border-top:1px solid rgba(236,234,228,.18)}.mobile-navigation summary{list-style:none;display:flex;gap:18px;align-items:baseline;cursor:pointer;padding:20px 0;font:450 30px/1.12 var(--font-serif)}summary::-webkit-details-marker{display:none}.mobile-navigation .roman{color:#E08A6B}.expand-sign{margin-left:auto;font:500 20px var(--font-mono)}.expand-sign::before{content:'+'}details[open] .expand-sign::before{content:'−'}.mobile-sublinks{margin:0 0 16px 3px;padding-left:22px;border-left:2px solid #E08A6B;display:flex;flex-direction:column}.mobile-sublinks a{padding:12px 0;min-height:44px;font-weight:500;color:#C9C7C0}.mobile-sublinks a:hover{color:#E08A6B}.mobile-bottom{display:flex;justify-content:space-between;margin-top:42px;font:400 12px var(--font-mono)}.menu-locked{overflow:hidden}
/* Editorial cover and asymmetrical strips. */
.cover{padding-top:52px;padding-bottom:80px;display:grid;grid-template-columns:7fr 5fr;gap:64px}.cover-kicker{display:flex;flex-wrap:wrap;gap:16px;align-items:center;margin-bottom:34px}.cover-kicker .mono{color:var(--color-muted)}.cover h1{font-size:76px;line-height:1;font-weight:380}.cover .lead{margin-top:34px;font-size:23px;line-height:1.45}.cover-bottom{display:grid;grid-template-columns:1fr 1.45fr;gap:36px;align-items:end;margin-top:44px}.cover-index{border-left:1px solid var(--color-line);padding-left:28px;font-size:13px}.cover-index>div+div{margin-top:8px}.cover-visual{min-width:0}.engineering-figure svg{background-color:var(--color-panel);background-image:linear-gradient(rgba(45,87,160,.085) 1px,transparent 1px),linear-gradient(90deg,rgba(45,87,160,.085) 1px,transparent 1px);background-size:20px 20px}.engineering-figure figcaption{font:400 13px/1.55 var(--font-sans);color:#4A4B4F;padding-top:12px}.engineering-figure figcaption .mono{color:var(--color-ink);margin-right:12px}.editorial-strip{border-top:2px solid var(--color-ink);display:grid;grid-template-columns:4fr 3fr 3fr 2fr}.editorial-strip>article{padding:28px;border-right:1px solid var(--color-line)}.editorial-strip>article:first-child{padding-left:0}.editorial-strip>article:last-child{border:0;padding-right:0}.editorial-strip h2,.editorial-strip h3{font-size:28px;line-height:1.15;letter-spacing:-.02em}.editorial-strip .eyebrow{font-size:10px;margin-bottom:18px;color:var(--color-muted)}.editorial-strip article>a.mono{display:inline-block;margin-top:22px}.routes{display:grid;grid-template-columns:4fr 8fr;gap:64px;padding-top:104px;padding-bottom:112px}.section-intro h2{font-size:80px;line-height:.95;letter-spacing:-.035em;margin-bottom:24px}.section-intro p{max-width:340px;color:#4A4B4F}.route{display:grid;grid-template-columns:90px 1fr 30px;gap:20px;align-items:center;padding:22px 0;border-top:1px solid var(--color-line)}.route:last-child{border-bottom:1px solid var(--color-line)}.route-number{font:300 64px/.9 var(--font-serif);color:var(--color-rust)}.route-name{font:400 28px/1.2 var(--font-serif)}.route-arrow{font-size:26px}.route-track{display:flex;justify-content:space-between;position:relative;height:14px;margin-top:14px;max-width:360px}.route-track::before{content:'';height:1px;background:var(--color-ink);position:absolute;top:6px;left:0;right:0}.route-track i{display:block;z-index:1;width:5px;height:12px;background:var(--color-ink)}.engineering-section{background-color:var(--color-panel);background-image:linear-gradient(rgba(45,87,160,.075) 1px,transparent 1px),linear-gradient(90deg,rgba(45,87,160,.075) 1px,transparent 1px);background-size:32px 32px;padding-top:72px;padding-bottom:80px}.engineering-title{display:grid;grid-template-columns:8fr 4fr;gap:64px;margin-bottom:40px;align-items:end}.engineering-title h2{font-size:72px;line-height:1}.engineering-section .engineering-figure svg{background:none}.engineering-section>.arrow-link{margin-top:28px}.machine-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:36px 32px}.machine-image{display:block;overflow:hidden;aspect-ratio:1.5;background:var(--color-panel)}.machine-image img{width:100%;height:100%;object-fit:cover;transition:transform var(--transition)}.machine-image:hover img{transform:scale(1.025)}.machine-title{display:grid;grid-template-columns:30px 1fr 16px;gap:14px;align-items:baseline;margin-top:20px}.machine-title h3{font-size:27px;line-height:1.18}.machine-card>p{margin:12px 0 0 44px;color:var(--color-muted)}.visual-credit{margin-top:30px;color:var(--color-muted)}.technical-sheet{border:2px solid var(--color-ink);background-color:#F7F6F2;background-image:linear-gradient(rgba(23,24,26,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(23,24,26,.045) 1px,transparent 1px);background-size:12px 12px}.sheet-meta{display:flex;justify-content:space-between;gap:24px;padding:18px 28px;border-bottom:1px solid var(--color-ink)}.sheet-layout{display:grid;grid-template-columns:1fr 1.15fr;gap:48px;padding:48px}.sheet-layout h2{font-size:52px}.sheet-layout p{margin-top:24px}.sheet-layout .arrow-link{margin-top:24px}.engineering-profile svg{background:transparent}.process-section{padding-top:120px;padding-bottom:120px}.process-section h2{font-size:64px}.engineering-process svg{background:none}.topics-section{background:var(--color-ink);color:#ECEAE4;padding-top:80px;padding-bottom:88px}.topics-section>.eyebrow{color:#E08A6B}.topics-section>h2{font-size:80px;line-height:.95;margin-bottom:48px}.topic-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:40px}.topic-grid>div>a{display:flex;justify-content:space-between;gap:12px;border-top:1px solid rgba(236,234,228,.2);padding:14px 0;min-height:44px;font-size:15px}.topic-grid .topic-head{font:400 27px/1.2 var(--font-serif);margin-bottom:18px}.topic-head .mono{color:#E08A6B}.topics-section a:hover{color:#E08A6B}.fresh-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:40px 36px}.post-card{min-width:0;border-top:1px solid var(--color-line);padding-top:20px}.post-card h3{font-size:28px;margin-top:16px}.post-card p{font-size:14px;color:#4A4B4F;margin-top:14px}.post-card time{display:block;margin-top:18px;color:var(--color-muted)}.card-meta{color:var(--color-muted);margin-top:16px}.card-image{display:block;aspect-ratio:1.5;overflow:hidden;background:var(--color-panel)}.card-image img{width:100%;height:100%;object-fit:cover}.no-image{height:100%;display:flex;flex-direction:column;justify-content:space-between;padding:24px;background-image:linear-gradient(rgba(45,87,160,.15) 1px,transparent 1px),linear-gradient(90deg,rgba(45,87,160,.15) 1px,transparent 1px);background-size:24px 24px}.no-image-symbol{font:300 80px/1 var(--font-serif);align-self:end;color:var(--color-engineering)}.text-card .card-meta{margin-top:0}.empty-editorial{padding:44px 0;border-top:2px solid var(--color-ink);border-bottom:1px solid var(--color-line);background:repeating-linear-gradient(90deg,transparent 0,transparent 31px,rgba(45,87,160,.04) 32px)}.empty-editorial p{font:400 32px/1.2 var(--font-serif);margin-bottom:24px}.empty-editorial>.mono{color:var(--color-muted)}
/* Hubs, search, generic pages. */
.hub-intro{padding-top:48px;padding-bottom:0;display:grid;grid-template-columns:8fr 4fr;gap:64px}.hub-intro .eyebrow{margin-top:36px}.hub-intro h1{font-size:112px;line-height:.92;font-weight:340;letter-spacing:-.045em;hyphens:auto}.hub-description{font-size:19px;line-height:1.5;margin-top:28px;max-width:720px}.hub-sign{align-self:center;min-width:0}.hub-sign>.mono{color:var(--color-engineering)}.hub-feature{display:grid;grid-template-columns:7fr 5fr;gap:56px;align-items:center;padding-top:88px;padding-bottom:0}.hub-feature h2{font-size:44px}.hub-feature p{margin-top:24px;color:#4A4B4F}.hub-feature .arrow-link{margin-top:26px}.hub-feature img{width:100%;height:auto}.hub-child-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));margin-top:36px;border-top:2px solid var(--color-ink)}.hub-child-grid>a{display:flex;justify-content:space-between;gap:24px;padding:24px;border-bottom:1px solid var(--color-line);border-right:1px solid var(--color-line);font:400 26px/1.2 var(--font-serif)}.hub-group h2,.hub-latest h2{margin-bottom:36px;font-size:52px}.hub-group{padding-bottom:40px}.archive-header{padding-top:64px;padding-bottom:48px}.archive-header h1{font-size:96px}.archive-results{padding-top:0}.pagination{margin-top:48px}.nav-links{display:flex;gap:8px;flex-wrap:wrap}.page-numbers{padding:10px 16px;border:1px solid var(--color-line)}.page-numbers.current{color:var(--color-paper);background:var(--color-ink)}.search-header{padding-top:56px;padding-bottom:0}.search-line{display:flex;gap:20px;align-items:center;border-bottom:2px solid var(--color-ink);padding-bottom:24px}.search-line input{width:100%;min-width:0;border:0;background:none;font:400 48px/1.2 var(--font-serif);color:var(--color-ink)}.search-line input::placeholder{color:var(--color-muted)}.search-line button{border:0;background:none;font-size:44px;min-width:48px;min-height:48px}.search-filters{display:flex;flex-wrap:wrap;align-items:center;gap:24px;padding:28px 0;border-bottom:1px solid var(--color-line)}.search-filters label{font:400 11px var(--font-mono);display:flex;align-items:center;gap:16px}.search-filters select{border:1px solid var(--color-line);padding:12px;background:none;max-width:100%;font:400 14px var(--font-sans)}.search-filters button{padding:10px 16px;background:var(--color-ink);color:var(--color-paper);border:1px solid var(--color-ink);min-height:44px}.search-filters>a{font-size:13px;text-decoration:underline}.search-count{padding-top:18px;color:var(--color-muted)}.search-layout{display:grid;grid-template-columns:8fr 4fr;gap:64px;padding-top:48px}.search-results>h2{font-size:30px;margin-bottom:20px;padding-bottom:16px;border-bottom:2px solid var(--color-ink)}.search-results .post-card{padding:26px 0;border-bottom:1px solid var(--color-line);border-top:0}.search-results .post-card h3{font-size:32px}.search-sidebar>a{display:flex;gap:18px;align-items:baseline;justify-content:space-between;font:400 27px/1.2 var(--font-serif);padding:18px 0;border-top:1px solid var(--color-line)}.search-sidebar>a .mono{margin-right:auto}.search-help{margin-top:44px;padding-top:24px;border-top:2px solid var(--color-ink)}.search-help p{font-size:14px;color:#4A4B4F}.search-form{display:flex;gap:8px;border-bottom:1px solid var(--color-ink)}.search-form input{min-width:0;width:100%;border:0;background:none;padding:12px;font-size:15px}.search-form button{padding:10px;border:0;background:none;color:inherit;white-space:nowrap}.sd-page{padding-top:64px}.sd-page .entry-content{margin-top:56px;max-width:var(--content-width)}.about-page{padding-top:72px;padding-bottom:120px}.about-content>h2:first-child{font-size:88px;line-height:.98;letter-spacing:-.035em;font-weight:360;max-width:1240px;margin-top:0}.about-content>p:first-of-type{font:400 25px/1.5 var(--font-serif);max-width:860px;margin:36px 0 80px}.about-content>h2{margin-top:80px;max-width:100%}.about-content>.is-style-sd-technical{margin:0 0 80px!important;max-width:100%!important}.about-content>ol{max-width:900px;counter-reset:principle;padding:0;list-style:none}.about-content>ol>li{counter-increment:principle;position:relative;border-top:1px solid var(--color-line);padding:24px 0 24px 80px}.about-content>ol>li::before{content:counter(principle,decimal-leading-zero);position:absolute;left:0;top:18px;color:var(--color-rust);font:300 48px/1 var(--font-serif)}.about-topics,.about-formats{margin-top:104px}.about-topic-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));margin-top:32px;border-top:2px solid var(--color-ink)}.about-topic-grid>a{padding:24px;border-right:1px solid var(--color-line)}.about-topic-grid h3{margin:20px 0 14px}.about-topic-grid p{font-size:14px}.format-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));margin-top:36px}.format-grid>a{display:flex;flex-direction:column;gap:20px;padding:28px;border:1px solid var(--color-line);margin:-1px 0 0 -1px}.format-symbol{font:300 48px/1 var(--font-serif);color:var(--color-engineering)}.error-page{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}.error-number{font:300 160px/.9 var(--font-serif);color:var(--color-rust);margin-bottom:28px}.error-page h1{font-size:60px}.error-page p{margin:28px 0}.error-page .arrow-link{margin-top:32px}
/* Footer. */
.sd-footer{background:var(--color-ink);color:#ECEAE4}.fabric-band{height:56px;background:repeating-linear-gradient(90deg,#17181A 0,#2A2B2E 14px,#3A3B3E 22px,#232427 30px,#17181A 44px,#2E2F32 60px,#1D1E21 72px)}.footer-grid{display:grid;grid-template-columns:1.25fr repeat(5,minmax(0,1fr));gap:32px;padding:72px var(--gutter) 40px;border-bottom:1px solid rgba(236,234,228,.15)}.footer-grid .brand{font-size:28px;gap:10px}.footer-grid .brand-mark{width:24px;height:30px}.footer-brand p{font:400 24px/1.3 var(--font-serif);margin-top:26px;letter-spacing:-.02em}.footer-grid nav{display:flex;flex-direction:column;gap:13px;font-size:14px;line-height:1.4}.footer-grid nav .eyebrow{margin-bottom:8px;color:#E08A6B;font-size:10px}.footer-grid ul{padding:0;margin:0;list-style:none}.footer-grid li+li{margin-top:13px}.sd-footer a:hover{color:#E08A6B}.footer-note{display:grid;grid-template-columns:2fr 1fr auto;align-items:center;gap:40px;padding:32px var(--gutter) 40px;color:#A3A29D;font-size:12px}.footer-note p{max-width:550px}.footer-note>a{font-family:var(--font-mono)}
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