:root{color-scheme:light;--paper:#fcfbf8;--ink:#203039;--muted:#586973;--accent:#245d72;--line:#d9dfdf;--panel:#eef2f2;font-family:Segoe UI,Arial,sans-serif;color:var(--ink);background:var(--paper)}
*{box-sizing:border-box}body{margin:0}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;color:inherit;border:1px solid var(--line);background:transparent;border-radius:5px;padding:9px 14px;cursor:pointer}button:hover{background:var(--panel)}button:disabled{opacity:.3;cursor:default}a{color:var(--accent);text-underline-offset:4px}a:focus-visible,button:focus-visible{outline:3px solid var(--accent);outline-offset:4px}h1,h2,h3,p,figure{margin:0}h1{font-size:clamp(42px,5.4vw,78px);font-weight:600;line-height:1.12;letter-spacing:-.045em;max-width:1100px}h2{font-size:clamp(30px,3.2vw,48px);font-weight:600;letter-spacing:-.035em;line-height:1.15;margin-bottom:30px}h3{font-size:1em;line-height:1.3;font-weight:650;margin-bottom:10px}strong{font-weight:650}.accent{color:var(--accent)}
.toolbar{height:76px;padding:0 4vw;display:flex;align-items:center;gap:32px;border-bottom:1px solid var(--line);font-size:14px;background:var(--paper);position:relative;z-index:5}.brand{text-decoration:none;color:var(--ink);font-size:21px;font-weight:700;letter-spacing:.08em}.brand span{color:var(--muted);font-weight:400}.toolbar nav{display:flex;gap:8px;margin-left:auto}#chapter{color:var(--muted)}
.slide{padding:42px 5vw 38px;max-width:1600px;margin:auto;line-height:1.5;font-size:clamp(20px,2vw,29px);border-bottom:1px solid var(--line)}.content{max-width:1300px}.content> *+*{margin-top:22px}.content>ul:first-child,.content>ol:first-child{margin-top:0}ul,ol{padding-left:1.25em;margin:16px 0}li{padding-left:.2em;margin:10px 0}li::marker{color:var(--accent)}.columns{display:flex;gap:38px;align-items:center;margin:10px 0 26px}.column{flex:1;min-width:0}.column> *+*{margin-top:18px}.block{border-left:3px solid #9bafb6;padding:16px 22px;background:var(--panel);margin:20px 0}.emphasis{border-left-color:var(--accent);background:#e8eff1}.block ul,.block ol{margin-bottom:0}.source{font-size:15px;color:var(--muted)}figure{text-align:center}figure img{display:block;max-width:100%;max-height:37vh;width:auto;height:auto;object-fit:contain;margin:auto;cursor:zoom-in}figure img:focus-visible{outline:3px solid var(--accent)}.diagram{width:100%;max-height:360px;display:block}.center{text-align:center}.center table{text-align:left}.flow{display:flex;align-items:center;justify-content:center;gap:18px;margin:24px auto 36px}.flow>div{padding:18px;border:1px solid #bac8cc;border-radius:5px;background:var(--panel);flex:1}.flow.vertical{flex-direction:column;gap:7px;margin:0 auto;max-width:500px}.flow.vertical>div{padding:9px 22px;width:100%}.arrow{color:var(--accent)}.avatar-symbol{text-align:center}.avatar-symbol svg{width:230px;max-height:26vh}.avatar-symbol p{font-size:.9em}table{border-collapse:collapse;width:100%;font-size:.88em;line-height:1.4}td,th{padding:16px 18px;border-bottom:1px solid var(--line);vertical-align:top}th{text-align:left;background:var(--panel)}td:first-child{font-weight:600;min-width:120px}.table-wrap{overflow-x:auto}.cover{padding:4vh 0}.eyebrow{text-transform:uppercase;letter-spacing:.14em;font-size:15px;color:var(--accent);margin-bottom:30px}.byline{margin-top:40px;color:var(--muted);font-size:22px;line-height:1.6}.closing{font-size:32px;color:var(--muted)}
.controls{height:70px;padding:0 4vw;display:flex;align-items:center;justify-content:space-between;gap:20px;position:relative;background:var(--paper);border-top:1px solid var(--line);font-size:13px;color:var(--muted)}.pager{display:flex;gap:18px;align-items:center}.pager button{font-size:22px;padding:3px 16px}.pager output{font-variant-numeric:tabular-nums;min-width:68px;text-align:center;color:var(--ink)}.progress{position:absolute;bottom:0;left:0;right:0;height:3px;background:var(--line)}#progress-value{height:100%;background:var(--accent);transition:width .26s ease}.sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip-path:inset(50%)}
body.presenting{height:100dvh;overflow:hidden;display:grid;grid-template-rows:76px minmax(0,1fr) 70px}.presenting #deck{position:relative;overflow:hidden;min-height:0}.presenting .slide{position:absolute;inset:0;overflow:auto;max-width:1600px;width:100%;border:0;display:flex;flex-direction:column;justify-content:safe center}.presenting .slide[hidden]{display:none}.presenting .title-slide{justify-content:center}.presenting .slide:focus{outline:none}body.reading .slide{min-height:70vh;padding-top:70px;padding-bottom:70px}.reading .toolbar{position:sticky;top:0}.reading .controls{position:sticky;bottom:0}.reading .slide{scroll-margin-top:75px}.reading #reading{background:var(--panel)}
dialog{border:1px solid var(--line);border-radius:10px;padding:28px;color:var(--ink);background:var(--paper);max-height:85dvh;width:min(850px,92vw)}dialog::backdrop{background:rgba(25,38,44,.45)}.dialog-heading{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-bottom:25px}.dialog-heading h2{margin:0;font-size:30px}#overview nav{display:grid;gap:3px}#overview nav a{display:grid;grid-template-columns:35px 1fr;gap:8px;text-decoration:none;padding:12px;border-radius:4px;color:var(--ink)}#overview nav a:hover,#overview nav a[aria-current]{background:var(--panel)}#overview nav a>span:first-child{color:var(--muted);font-variant-numeric:tabular-nums}#overview small{grid-column:2;color:var(--muted)}#image-view{width:96vw;height:92dvh;padding:50px 20px 20px}#image-view img{width:100%;height:100%;object-fit:contain}#image-view .close{position:absolute;right:12px;top:9px}
@media(min-width:1100px) and (max-height:760px){.slide{font-size:23px;padding-top:25px;padding-bottom:25px}h2{font-size:36px;margin-bottom:22px}.block{padding:12px 18px;margin:16px 0}li{margin:7px 0}.content> *+*{margin-top:17px}.columns{margin-bottom:15px}.flow.vertical{gap:3px}.flow.vertical>div{padding:4px 20px}}
@media(max-width:760px){.toolbar{padding:0 18px;gap:12px;height:65px}.toolbar nav{gap:5px}.toolbar button{padding:8px 10px}#chapter,#fullscreen span,.hint,.credit{display:none}body.presenting{grid-template-rows:65px minmax(0,1fr) 64px}.slide{font-size:20px;padding:28px 22px}h2{font-size:30px;margin-bottom:24px}.columns{flex-direction:column;align-items:stretch;gap:20px}.column{flex:auto}.block{padding:15px 17px}figure img{max-height:32vh}.flow{flex-wrap:wrap;gap:10px}.flow>div{min-width:100px;padding:12px}.flow.vertical{gap:4px}.flow.vertical>div{min-width:0}.controls{height:64px;justify-content:center}.presenting .slide{justify-content:flex-start}.byline{font-size:20px}.cover{padding:3vh 0}table{font-size:18px}td,th{padding:12px 10px}.table-wrap{max-width:100%}dialog{padding:18px}}
:root[data-theme="dark"]{color-scheme:dark;--paper:#151d23;--ink:#e5edf1;--muted:#afbec8;--accent:#8dcde1;--line:#384751;--panel:#223039}
:root[data-theme="dark"] .emphasis{background:#243b46}
:root[data-theme="dark"] .flow>div{border-color:#617783}
:root[data-theme="dark"] .diagram rect,:root[data-theme="dark"] .avatar-symbol circle{fill:var(--panel);stroke:#8aa4b0}
:root[data-theme="dark"] .diagram text{fill:var(--ink)}
:root[data-theme="dark"] .diagram path[stroke],:root[data-theme="dark"] .avatar-symbol path{stroke:var(--accent)}
:root[data-theme="dark"] .diagram marker path{fill:var(--accent)}
#theme{font-size:20px;line-height:1;min-width:40px}
@media(max-width:400px){.toolbar{padding-inline:12px;gap:8px}.toolbar button{padding-inline:8px}.brand{font-size:18px}#theme{min-width:34px}}
@media print{:root[data-theme="dark"]{color-scheme:light;--paper:#fff;--ink:#203039;--muted:#586973;--accent:#245d72;--line:#d9dfdf;--panel:#eef2f2}:root[data-theme="dark"] .emphasis{background:#e8eff1}}
@media(min-width:761px) and (max-height:820px){#slide-17 figure img{max-height:30vh}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
@media print{@page{size:A4 landscape;margin:12mm}.toolbar,.controls,dialog,.no-script{display:none!important}body.presenting{display:block;height:auto;overflow:visible}#deck{overflow:visible!important}.slide,.presenting .slide,.presenting .slide[hidden]{display:block!important;position:static!important;overflow:visible;break-after:page;border:none;min-height:0;padding:12px;font-size:18px;max-width:none}.slide:last-child{break-after:auto}h1{font-size:48px}h2{font-size:30px}.columns{display:flex;flex-direction:row}.content>*+*{margin-top:16px}figure img{max-height:100mm}.block{break-inside:avoid}li{margin:7px 0}.source{font-size:12px}}

/* PGA-specific content layers; typography and navigation inherit VHS 01. */
.slide-source{font-size:13px;line-height:1.5;color:var(--muted);margin-top:24px}.compact{font-size:clamp(19px,1.65vw,25px)}.compact .content>*+*{margin-top:15px}.compact h2{margin-bottom:22px}.gallery{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;align-items:center}.gallery:has(figure:only-child){grid-template-columns:1fr}.gallery img{max-height:25vh}.gallery figure:only-child img{max-height:36vh}figcaption{font-size:14px;line-height:1.4;color:var(--muted);margin-top:6px}.slide:not(.compact) .gallery{max-width:1150px}.lab{font-size:18px;line-height:1.5}.lab label{display:block;margin:12px 0}.lab input[type=range]{display:block;width:100%;min-height:40px;accent-color:var(--accent)}.lab input[type=checkbox],.lab-options input{accent-color:var(--accent)}.lab-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}.lab button{min-height:44px}.lab-options{display:flex;flex-wrap:wrap;gap:12px;border:1px solid var(--line);padding:12px 18px}.lab-options label{padding:6px 10px;font-size:22px}.lab-options legend{font-size:16px;color:var(--muted)}.cycle{display:grid;gap:6px;list-style:none;padding:0;margin:14px 0}.cycle li{padding:6px 12px;border-left:3px solid var(--line);margin:0;font-size:19px}.cycle li.active{border-color:var(--accent);background:var(--panel);font-weight:700}.lab output{display:block;font-variant-numeric:tabular-nums}.lab label output{display:inline}.preview-pair{display:grid;grid-template-columns:1fr 1fr;gap:12px}.preview-pair canvas{width:100%;height:auto;image-rendering:pixelated;border:1px solid var(--line)}.memory{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:0}.memory dt{font-size:16px;color:var(--muted)}.memory dd{margin:0;font-size:32px;font-variant-numeric:tabular-nums}#tile-grid{display:flex;flex-direction:column;border:1px solid var(--line);height:110px;margin-top:10px}#tile-grid i{flex:1;border-bottom:1px solid var(--line)}#tile-grid i.done{background:var(--accent)}.original-figure{font-size:16px;margin-top:14px}.original-figure summary{cursor:pointer;color:var(--accent)}.original-figure[open]{padding-bottom:12px}#notes-panel{position:fixed;inset:90px 16px 90px auto;margin:0;width:min(540px,94vw);font-size:17px;line-height:1.6;box-shadow:-10px 0 50px #0003}#notes-panel[aria-modal=true]{inset:auto;margin:auto}#notes-panel h2{font-size:24px}#notes-original{white-space:pre-wrap;overflow-wrap:anywhere;font:15px/1.6 Segoe UI,Arial,sans-serif;border-top:1px solid var(--line);padding-top:16px}summary:focus-visible,input:focus-visible{outline:3px solid var(--accent);outline-offset:4px}.toolbar button[aria-expanded=true]{background:var(--panel)}.source a{overflow-wrap:anywhere}
@media(max-width:760px){.toolbar{height:auto;min-height:65px;padding:10px 12px;flex-wrap:wrap}.toolbar nav{margin:0;flex-wrap:wrap;gap:6px}.toolbar button{min-height:40px}body.presenting{grid-template-rows:auto minmax(0,1fr) 64px}.slide,.compact{font-size:20px;padding:26px 20px}.gallery{grid-template-columns:1fr 1fr}.gallery img{max-height:none;max-width:100%}.columns.lab-columns{gap:18px}.memory dd{font-size:27px}.lab-options label{font-size:18px}.slide-source{margin-top:18px}.reading .slide{scroll-margin-top:145px}.reading .toolbar{position:relative}}
@media print{.slide,.presenting .slide,.presenting .slide[hidden],.compact{font-size:17px;padding:6px}.slide h1{font-size:39px}.slide h2{font-size:28px;margin-bottom:15px}.slide-source{font-size:10px;margin-top:10px}.content>*+*,.compact .content>*+*{margin-top:11px}.block{padding:10px 14px;margin:12px 0}.gallery img,.gallery figure:only-child img{max-height:62mm}.gallery figcaption{font-size:10px}.gallery{gap:10px}.original-figure,.lab-options,.lab-actions,.lab input{display:none!important}.lab{font-size:14px}.cycle li{font-size:14px;padding:3px 8px}.columns{gap:22px}.memory dd{font-size:24px}.source{font-size:11px}.preview-pair canvas{max-height:42mm}.reading .slide{padding:6px}td,th{padding:8px 12px}li{margin:5px 0}#notes-panel{display:none!important}}
@media(min-width:761px) and (max-height:820px){#slide-1 .cover{padding:0}#slide-1 .byline{margin-top:16px}#slide-1 .block{margin:12px 0;padding:12px 18px}#slide-23 .gallery img{max-height:22vh}#slide-23 .gallery{gap:12px}}
@media print{.sr-only{display:none!important}#slide-23 .gallery img{max-height:43mm}#slide-1 .cover{padding:0}#slide-1 .byline{margin-top:16px}}

.source-slide{padding:12px 3vw 10px;gap:8px;justify-content:flex-start!important}.source-slide figure{flex:1;min-height:0;display:flex;align-items:center;justify-content:center;width:100%;margin:0}.source-slide figure img{max-width:100%;max-height:var(--source-height,70vh);width:auto;height:auto;background:#fff}.source-slide .slide-source{margin:0;font-size:13px}.source-transcript{display:none;white-space:pre-wrap;overflow-wrap:anywhere;font:17px/1.6 Consolas,monospace;width:100%;max-width:1200px;margin:0 auto;overflow:auto}.textual .source-slide figure{display:none}.textual .source-transcript{display:block}.textual .source-slide{overflow:auto}.reading .source-slide{min-height:0;padding:24px}.reading .source-slide figure img{max-height:none;width:min(100%,1100px)}.reading .source-transcript{overflow:visible}.lab-dialog{width:min(1050px,96vw)}.lab-dialog h2{font-size:28px;margin:0}.lab-layout{display:grid;grid-template-columns:minmax(240px,.8fr) minmax(0,1.4fr);gap:24px;margin-top:24px}.lab-settings{display:flex;flex-direction:column;gap:14px}.lab-settings label{font-size:17px}.lab-settings input,.lab-settings select{display:block;width:100%;margin-top:6px;min-height:32px;accent-color:var(--accent)}.lab-settings select{font:inherit;color:var(--ink);background:var(--paper);border:1px solid var(--line);padding:8px}.lab-settings output{font-weight:650;margin-left:8px}.lab-visual{width:100%;height:auto;max-height:380px;border:1px solid var(--line);background:#fff;touch-action:none}.lab-result{white-space:pre-wrap;font:15px/1.6 Consolas,monospace;margin:14px 0;padding:12px;background:var(--panel)}.lab-disclaimer{font-size:14px;line-height:1.5;color:var(--muted);margin-top:16px}.source-links{display:grid;gap:8px;font-size:15px;overflow-wrap:anywhere}.notes-original{white-space:pre-wrap;font:16px/1.6 Consolas,monospace}.toolbar nav{flex-wrap:wrap}#notes-panel{position:relative;inset:auto;width:min(800px,94vw);margin:auto;font-size:17px}
.source-frame{position:relative;width:100%;aspect-ratio:var(--page-ratio);max-width:calc(var(--source-height,500px)*var(--page-ratio));background:#fff}.page-svg{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}.source-zoom{position:absolute;inset:0;width:100%;height:100%;padding:0;border:0;background:transparent!important;cursor:zoom-in;border-radius:0}.source-zoom:focus-visible{outline:3px solid var(--accent);outline-offset:3px}.reading .source-frame{max-width:1100px}.source-svg-zoom{width:100%;height:100%;pointer-events:none}
@media(max-width:760px){.lab-layout{grid-template-columns:minmax(0,1fr)}.lab-settings{gap:10px}.source-slide{padding:8px 12px}.source-slide .slide-source{font-size:11px}.source-transcript{font-size:15px}.lab-dialog{padding:16px}.lab-dialog h2{font-size:23px}}
@media print{.source-slide,.presenting .source-slide,.presenting .source-slide[hidden]{display:block!important;padding:0!important}.source-slide figure{display:block!important}.source-frame{width:100%;height:170mm;max-width:100%;aspect-ratio:auto}.source-zoom{display:none}.source-transcript,.lab-dialog,#notes-panel,.sr-only{display:none!important}.source-slide .slide-source{font-size:9px}.slide{break-after:page}}