/* A persistent chapter route keeps the long scroll story easy to navigate. */
:root{scrollbar-gutter:stable}
html.reference-open{overflow:hidden}
.chapter-menu{position:relative;letter-spacing:0}
.chapter-menu summary{display:flex;align-items:center;gap:14px;min-height:40px;padding:0 8px;cursor:pointer;list-style:none;font-size:10px}
.chapter-menu summary::-webkit-details-marker{display:none}
.chapter-menu summary>span{font-size:16px;transition:transform .2s}
.chapter-menu[open] summary>span{transform:rotate(45deg)}
.chapter-menu nav{position:absolute;right:-8px;top:100%;width:244px;padding:13px 15px;background:var(--chalk);border:1px solid #38141d30;box-shadow:0 12px 30px #17171718}
.review-bar .chapter-menu nav a{display:flex;align-items:center;gap:22px;font-size:12px;min-height:46px;padding:0 13px}
.chapter-menu nav a>span{font-size:9px;opacity:.6;font-variant-numeric:tabular-nums}
.chapter-menu nav a:hover,.chapter-menu nav a[aria-current]{background:#38141d0a}
.chapter-menu nav a[aria-current]{box-shadow:inset 2px 0 var(--oxblood)}
.swift-atlas{margin:0 0 70px;border-top:1px solid #38141d30;padding-top:28px}
.atlas-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:40px;margin-bottom:35px}
.atlas-heading .swift-kicker{margin-bottom:20px}
.atlas-heading h3{font:400 clamp(36px,3.9vw,58px)/1.05 Newsreader,Georgia,serif;letter-spacing:-.035em;margin:0}
.atlas-heading h3 em{font-weight:400}
.atlas-heading>p{font-size:12px;line-height:1.8;max-width:330px;color:#77595c;margin:0 0 3px}
.atlas-images{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(0,1fr);gap:4.5%}
.atlas-figure{margin:0;min-width:0}
.atlas-rear{padding-top:96px}
.atlas-frame,.reference-print{position:relative;isolation:isolate;overflow:hidden;background:#e3d5c7;border:8px solid #e3d5c7;box-shadow:0 0 0 1px #38141d20}
.atlas-frame{aspect-ratio:4272/2856}
/* A shared print treatment integrates the references without altering source pixels. */
.atlas-frame img,.reference-print img{filter:grayscale(.94) sepia(.22) saturate(.6) contrast(.92) brightness(1.04)}
.atlas-frame::before,.reference-print::before{content:"";position:absolute;inset:0;z-index:1;background:#683b42;mix-blend-mode:color;opacity:.32;pointer-events:none}
.atlas-frame::after,.reference-print::after{content:"";position:absolute;inset:0;z-index:1;background:linear-gradient(180deg,#38141d26,transparent 38%,#f1e8de0c);mix-blend-mode:multiply;box-shadow:inset 0 0 0 1px #38141d18;pointer-events:none}
.atlas-frame img{display:block;width:100%;height:100%;object-fit:cover;transform-origin:center}
.atlas-photo-label{position:absolute;top:13px;left:13px;z-index:2;background:var(--chalk);color:var(--oxblood);padding:9px 11px;font-size:7px;line-height:1.4;letter-spacing:.1em}
.atlas-expand{position:absolute;right:13px;bottom:13px;z-index:2;width:44px;height:44px;display:grid;place-items:center;background:var(--chalk);color:var(--oxblood);border-radius:50%;font-size:24px;transition:background .2s,color .2s}
.atlas-expand:hover{background:var(--oxblood);color:var(--chalk)}
.atlas-expand:focus-visible{outline-color:var(--chalk);outline-offset:4px}
.atlas-figure figcaption{display:grid;grid-template-columns:24px 1fr;gap:15px;border-top:1px solid #38141d30;margin-top:20px;padding-top:19px}
.atlas-number{font-size:9px;line-height:1.5;padding-top:5px;color:#77595c}
.atlas-figure h4{font:400 clamp(27px,2.6vw,38px)/1.15 Newsreader,Georgia,serif;letter-spacing:-.03em;margin:0 0 11px}
.atlas-figure figcaption p{font-size:12px;line-height:1.8;margin:0;color:#77595c}
.atlas-credit{font-size:10px;line-height:1.8;color:#77595c;border-top:1px solid #38141d22;margin:29px 0 0;padding-top:15px}
.atlas-credit a{display:inline-block;text-decoration:underline;text-underline-offset:3px;margin-left:8px;padding:4px 0}
body[data-motion=on] .atlas-figure{opacity:1;transform:none}
body[data-motion=on] .atlas-frame img{transform:scale(calc(1.035 - var(--chapter-reveal,0)*.035))}
body[data-motion=on] .atlas-figure figcaption{opacity:calc(.55 + var(--chapter-reveal,0)*.45);transform:translateY(calc((1 - var(--chapter-reveal,0))*9px))}
.reference-viewer{width:min(1200px,calc(100vw - 56px));max-width:none;max-height:calc(100svh - 48px);padding:20px 24px 18px;border:1px solid #f1e8de30;background:#211619;color:var(--chalk)}
.reference-viewer::backdrop{background:#171717e8}
.reference-viewer-top{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:16px}
.reference-viewer-top h2{font:10px/1.5 'IBM Plex Sans',Arial,sans-serif;letter-spacing:.08em;margin:0}
.reference-close{background:none;display:flex;align-items:center;justify-content:center;gap:20px;min-width:80px;min-height:44px;font-size:11px}
.reference-close>span{font-size:24px}
.reference-viewer figure{margin:0}
.reference-print{width:fit-content;max-width:100%;margin-inline:auto;border-width:6px}
.reference-viewer img{display:block;width:auto;max-width:100%;height:auto;max-height:calc(100svh - 218px);object-fit:contain}
.reference-viewer figcaption{font-size:11px;line-height:1.6;color:#d4c0ba;margin-top:17px}
@media(max-width:760px){
 .review-bar{padding:0 15px}
 .review-bar>div{gap:10px}
 .chapter-menu summary{font-size:9px;gap:10px;padding:0 5px}
 .chapter-menu nav{right:-75px;width:min(270px,calc(100vw - 30px))}
 .swift-study-body p:first-child{font-size:14px;line-height:1.75}
 .swift-study-body p:last-child{font-size:12px;line-height:1.8}
 .swift-introduction>p>span,.method-lede p:last-child{font-size:12px}
 .swift-project-facts dd{font-size:11px}
 .swift-record-caption{font-size:10px}
 .swift-atlas{margin-bottom:44px;padding-top:24px}
 .atlas-heading{display:block;margin-bottom:26px}
 .atlas-heading h3{font-size:39px}
 .atlas-heading>p{margin-top:19px;font-size:12px;max-width:440px}
 .atlas-images{grid-template-columns:minmax(0,1fr);gap:33px}
 .atlas-rear{padding:0}
 .atlas-frame{aspect-ratio:4272/2856;border-width:5px}
 .atlas-photo-label{top:9px;left:9px;font-size:6px;padding:7px 9px}
 .atlas-expand{right:9px;bottom:9px}
 .atlas-figure figcaption{margin-top:14px;padding-top:15px;gap:12px}
 .atlas-figure h4{font-size:30px}
 .atlas-figure figcaption p{font-size:12px}
 .atlas-credit{font-size:10px;margin-top:25px}
 .atlas-credit a{min-height:32px;padding:7px 0;margin:0 12px 0 0}
 .reference-viewer{width:calc(100vw - 24px);padding:12px 14px 17px;max-height:calc(100svh - 24px)}
 .reference-viewer-top{gap:15px;margin-bottom:10px}
 .reference-viewer-top h2{font-size:9px;max-width:180px}
 .reference-close{gap:12px;min-width:70px}
 .reference-viewer figcaption{font-size:10px;margin-top:14px}
 .reference-print{border-width:4px}
}