:root{--bg:#111b1b;--panel:#172322;--fg:#eeeade;--muted:#9aa8a0;--line:#31413c;--accent:#edb38b;--green:#9cbea9;--blue:#a4b6d5;--serif:Georgia,'Times New Roman',serif;--sans:system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font-family:var(--sans);font-size:14px}button,a,input{touch-action:manipulation}button{font:inherit;color:inherit;cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible{outline:2px solid var(--accent);outline-offset:5px}button{border:0;background:none}a{color:inherit}header{height:84px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);padding:0 5%;gap:24px}.brand{display:flex;align-items:center;gap:13px;text-decoration:none}.mark{font:36px var(--serif);color:var(--accent)}.brand b{font:19px var(--serif);font-weight:normal}.brand small{display:block;font:9px var(--sans);letter-spacing:2.5px;text-transform:uppercase;color:var(--muted);margin-top:5px}nav{display:flex;gap:28px;height:100%;align-items:center}nav button{height:100%;position:relative;font-size:12px;color:var(--muted);padding:0}nav button.active{color:var(--fg)}nav button.active:after{content:'';position:absolute;bottom:0;left:0;right:0;height:2px;background:var(--accent)}.source-top{font-size:11px;text-decoration:none;border:1px solid var(--line);padding:10px 14px;border-radius:4px}.page{max-width:1500px;margin:auto;padding:48px 5% 110px}.eyebrow{font-size:10px;text-transform:uppercase;letter-spacing:2.5px;color:var(--accent);display:flex;align-items:center;gap:10px}.eyebrow:before{content:'';height:5px;width:5px;border-radius:50%;background:currentColor}h1{font:clamp(38px,4.8vw,68px)/1.08 var(--serif);font-weight:normal;letter-spacing:-2px;margin:20px 0 18px}h1 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circle.core{fill:var(--bg);stroke:currentColor;stroke-width:2;transition:all .3s}.node:hover .ring,.node:focus-visible .ring,.node.selected .ring{opacity:.65}.node.selected circle.core{fill:currentColor}.node text{fill:var(--fg);font:12px var(--sans)}.node text.year{fill:var(--muted);font:10px var(--sans)}.node.faded{opacity:.1}.node{transition:opacity .35s}.node.selected .ring{animation:breathe 4s infinite}.map-foot{display:flex;justify-content:space-between;gap:16px;padding:15px 25px;border-top:1px solid var(--line);font-size:9px;color:var(--muted)}.detail{background:var(--panel);border-left:1px solid var(--line);padding:25px;position:relative}.detail .year-big{font:56px var(--serif);color:var(--accent);line-height:1;margin:22px 0 15px}.detail h2{font:28px/1.15 var(--serif);font-weight:normal;margin:7px 0}.detail .person{font-size:11px;color:var(--muted);margin:12px 0 19px}.detail p{font-size:12px;color:var(--muted);line-height:1.8}.formula{font:22px/1.4 var(--serif);color:var(--fg);margin:20px 0;padding:17px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);overflow-wrap:anywhere}.detail-actions{display:flex;flex-wrap:wrap;gap:14px;align-items:center}.text-link{font-size:10px;text-underline-offset:4px;color:var(--muted)}.below{display:grid;grid-template-columns:1fr 1fr 1fr;gap:28px;margin-top:30px}.route{padding-top:15px;border-top:1px solid var(--line);text-align:left;width:100%;display:block}.route .num{font:11px var(--sans);color:var(--accent)}.route h3{font:22px var(--serif);font-weight:normal;margin:10px 0}.route p{font-size:11px;line-height:1.7;color:var(--muted);margin:0}.route:hover h3{color:var(--accent)}.route h3 span{float:right;font-family:var(--sans);font-size:17px}.switcher{position:fixed;bottom:18px;left:50%;transform:translateX(-50%);z-index:10;background:#ede9de;color:#23332c;box-shadow:0 5px 30px #0005;border:1px solid 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var(--line);border-radius:6px;overflow:hidden}.experiment-top{padding:22px 28px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);gap:20px}.experiment-top h2{font:26px var(--serif);font-weight:normal;margin:0 0 5px}.experiment canvas{width:100%;height:340px;display:block;background:radial-gradient(ellipse at center,#20342d,transparent)}.lab-controls{padding:22px 28px;background:var(--panel);display:flex;gap:25px;align-items:center}.lab-controls label{font-size:11px;white-space:nowrap}.lab-controls input{accent-color:var(--accent);width:100%}.lab-controls output{font:28px var(--serif);color:var(--accent);min-width:52px}.explanation{font-size:12px;line-height:1.8;color:var(--muted);padding:0 28px 24px;background:var(--panel)}.explanation p{margin:0}.lab-note{color:var(--muted);font-size:10px;line-height:1.7;margin-top:18px}.motion{font-size:10px;color:var(--muted);border:1px solid var(--line);border-radius:3px;padding:7px 10px}.footer{margin-top:35px;padding-top:17px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:20px;color:var(--muted);font-size:9px;line-height:1.7}.empty{padding:30px;color:var(--muted)}@keyframes flow{to{stroke-dashoffset:-400}}@keyframes breathe{50%{r:17;opacity:.25}}@keyframes enter{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}body.paused *,body.paused *:before{animation-play-state:paused!important}body.paused .view{animation:none!important}@media(prefers-reduced-motion:reduce){*{animation:none!important;scroll-behavior:auto!important}}@media(min-width:1500px){.map-svg{height:410px}}@media(max-width:1000px){header{padding:0 4%;gap:14px}nav{gap:16px}.page{padding:35px 4% 100px}.atlas-layout{grid-template-columns:minmax(0,1fr) 260px}.detail{padding:20px}.intro p{max-width:300px}.lab-layout{grid-template-columns:190px 1fr;gap:20px}}@media(max-width:740px){header{height:auto;min-height:80px;flex-wrap:wrap;padding-top:13px;gap:7px}.brand b{font-size:17px}.source-top{font-size:9px;padding:8px;margin-left:auto}nav{order:3;width:100%;height:40px;justify-content:center;gap:30px}.page{padding-top:28px}.intro{display:block;margin-bottom:24px}.intro p{max-width:none}.intro h1{margin-top:16px;font-size:43px}.atlas-layout{grid-template-columns:1fr}.detail{border-left:0;border-top:1px solid var(--line)}.detail .year-big{float:right;margin:0;font-size:44px}.detail h2{font-size:25px;max-width:75%}.detail p{max-width:550px}.map-svg{height:310px}.map-head{padding:16px}.map-foot{padding:12px 16px}.toolbar{flex-wrap:wrap}.below{gap:16px}.route h3{font-size:18px}.route p{font-size:10px}.lab-layout{display:block}.lab-menu{flex-direction:row;margin-bottom:20px;gap:7px}.lab-choice{padding:12px;flex:1}.lab-choice b{font-size:18px}.lab-choice p{display:none}.lab-choice .small{font-size:9px}.lab-menu .lab-note{display:none}.experiment-top{padding:18px}.experiment-top h2{font-size:21px}.lab-controls{padding:18px;gap:15px}.explanation{padding:0 18px 20px}.timeline-row{grid-template-columns:70px 1fr;gap:12px}.timeline-row .small{display:none}.timeline-row .date{font-size:27px}.timeline-row h3{font-size:22px}.timeline-detail{padding-left:82px}.footer{flex-direction:column;gap:7px}.timeline-controls{gap:12px}.timeline-controls label{max-width:110px;white-space:normal}.below{grid-template-columns:1fr}.route p{font-size:11px}.switcher{bottom:12px}.intro-actions{margin-bottom:25px}}
/* A shared discovery reader anchors both ways of browsing. */
header{height:77px}.brand b{font-size:20px}.edition{font-size:10px;color:var(--muted);letter-spacing:1.1px}.page{max-width:1600px;padding:36px 4.5% 40px}.intro{margin-bottom:28px}.intro h1{font-size:clamp(36px,4vw,57px);margin:16px 0 0}.intro p{max-width:350px;font-size:12px}.intro-actions{justify-content:flex-end}.eyebrow{letter-spacing:2px}.mode-bar{display:flex;align-items:center;justify-content:space-between;gap:20px;border-top:1px solid var(--line);padding:22px 0}.mode-switch{display:flex;gap:4px;background:#1c2925;border:1px solid var(--line);border-radius:6px;padding:4px}.mode-switch button{font-size:12px;padding:12px 22px;border-radius:3px;color:var(--muted)}.mode-switch button.active{background:var(--fg);color:var(--bg)}.mode-switch button span{margin-right:7px;font-size:15px}.mode-hint{font-size:11px;color:var(--muted)}.workspace{display:grid;grid-template-columns:minmax(0,1.18fr) minmax(360px,1fr);align-items:start;gap:24px}.browser-shell{min-width:0}.browse-intro{display:flex;align-items:flex-start;justify-content:space-between;gap:15px;margin:3px 0 20px}.browse-intro h2{font:24px var(--serif);font-weight:normal;margin:0 0 7px}.browse-intro p{font-size:11px;color:var(--muted);line-height:1.7;margin:0;max-width:400px}.search-box{display:flex;align-items:center;border:1px solid var(--line);background:#15211e;border-radius:4px;padding:0 12px;gap:10px;margin:0 0 13px}.search-box span{font-size:23px;color:var(--muted)}.search-box input{font:12px var(--sans);color:var(--fg);background:transparent;border:0;outline:none;padding:14px 0;width:100%;min-width:0}.search-box:focus-within{border-color:var(--accent)}.search-box input::placeholder{color:#8b9b92}.search-box button{font-size:19px}.filters{gap:4px;margin-bottom:17px}.filter{font-size:10px;padding:7px 11px}.browse-panel{border:1px solid var(--line);border-radius:5px;min-height:486px;overflow:hidden;background:radial-gradient(ellipse at 50% 35%,#24372d50,transparent 70%)}.browse-caption{padding:20px;display:flex;align-items:center;justify-content:space-between;gap:12px}.browse-caption .eyebrow{font-size:9px}.browse-caption>span:last-child{font-size:10px;color:var(--muted)}.map-svg{min-width:550px;height:350px;width:100%}.map-scroll{overflow:auto}.node text{font-size:13px}.node text.year{font-size:11px}.map-legend{padding:0 20px;margin:4px 0 22px;font-size:9px;line-height:1.6;color:var(--muted)}.map-invitation{border-top:1px solid var(--line);padding:20px;display:flex;gap:18px;align-items:center}.mini-orbit{font:43px var(--serif);color:var(--accent)}.map-invitation b{font:19px var(--serif);font-weight:normal}.map-invitation p{font-size:11px;color:var(--muted);line-height:1.7;margin:6px 0 0;max-width:390px}.reader-shell{min-width:0;position:sticky;top:20px}.reader{background:var(--panel);border:1px solid #526254;border-radius:5px;padding:28px 30px;max-height:750px;overflow-y:auto;scrollbar-width:thin;scrollbar-color:#526254 transparent;scroll-margin-top:20px}.reader-top{display:flex;justify-content:space-between;align-items:center;gap:15px}.topic-tag{font-size:10px;letter-spacing:1px;text-transform:uppercase;color:var(--muted)}.reader-date{font:38px var(--serif);color:var(--accent)}.reader h2{font:33px/1.14 var(--serif);font-weight:normal;letter-spacing:-.5px;margin:18px 0 12px;max-width:480px;outline:none}.reader-person{color:var(--muted);font-size:11px;margin:0 0 23px}.reader-tabs{display:flex;border-bottom:1px solid var(--line);gap:24px;margin-bottom:22px}.reader-tabs button{padding:0 0 11px;color:var(--muted);font-size:11px;border-bottom:2px solid transparent}.reader-tabs button.active{color:var(--accent);border-color:var(--accent)}.reader-tabs span{margin-left:5px}.reader-intro{font:18px/1.55 var(--serif);color:var(--fg);margin:0 0 24px}.statement{background:#101b1855;border-left:2px solid var(--accent);padding:17px 20px;margin-bottom:24px}.section-label{font-size:9px;letter-spacing:1.8px;color:var(--accent)}.reader-formula{font:23px/1.5 var(--serif);margin:14px 0;overflow-wrap:anywhere}.statement p,.insight p{font-size:12px;line-height:1.8;color:#b6c2b7;margin:0}.insight h3{font:20px var(--serif);font-weight:normal;margin:0 0 10px}.experience-callout{width:100%;display:flex;gap:17px;text-align:left;align-items:center;padding:18px;border:1px solid #566a55;border-radius:4px;margin:25px 0;background:linear-gradient(110deg,#2b3e31,#1d2d24)}.experience-callout:hover{border-color:var(--accent)}.experience-icon{font:38px var(--serif);color:var(--accent);width:36px;text-align:center}.experience-callout>span:nth-child(2){flex:1}.experience-callout small{display:block;font-size:8px;color:var(--green);letter-spacing:1.4px}.experience-callout b{display:block;font:20px var(--serif);font-weight:normal;margin:7px 0}.experience-callout>span:nth-child(2)>span{font-size:10px;color:var(--muted)}.proof{margin:25px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.proof summary{cursor:pointer;padding:18px 0;display:flex;align-items:center;justify-content:space-between;gap:15px;list-style:none}.proof summary::-webkit-details-marker{display:none}.proof small{display:block;font-size:8px;letter-spacing:1.2px;color:var(--muted);margin-bottom:8px}.proof b{font:20px var(--serif);font-weight:normal}.proof .plus{font-size:22px;color:var(--accent);transition:transform .2s}.proof[open] .plus{transform:rotate(45deg)}.proof ol{padding:0 0 5px 24px;margin-top:0}.proof li{font-size:12px;color:#b6c2b7;line-height:1.85;padding:0 0 15px 7px}.proof li::marker{color:var(--accent)}.continue-section{margin-top:28px;padding-top:23px;border-top:1px solid var(--line)}.continue-section>.eyebrow{font-size:9px;margin-bottom:15px}.related-card{display:flex;width:100%;align-items:center;justify-content:space-between;text-align:left;padding:13px 0;border-bottom:1px solid #31413c99;gap:15px}.related-card small{display:block;color:var(--muted);font-size:11px;line-height:1.5;margin-bottom:6px}.related-card b{font:20px var(--serif);font-weight:normal}.related-card i{font:12px var(--sans);font-style:normal;color:var(--muted)}.related-card>span:last-child{color:var(--accent)}.related-card:hover b{color:var(--accent)}.place-in-time{font-size:10px;color:var(--accent);padding:20px 0 0;text-align:left;line-height:1.6}.place-in-time span{margin-left:10px}.back-idea{font-size:10px;color:var(--muted);padding:0 0 20px;text-align:left}.back-idea:hover{color:var(--accent)}.embedded-lab h3{font:25px var(--serif);font-weight:normal;margin:0 0 12px}.embedded-lab>p{font-size:11px;line-height:1.8;color:#b6c2b7;margin:0 0 16px}.embedded-lab canvas{display:block;width:100%;height:270px;border:1px solid var(--line);background:#0f1c17;border-radius:4px}.lab-controls{padding:15px 0;gap:14px;flex-wrap:wrap}.lab-controls label{font-size:10px}.lab-controls input{flex:1;min-width:70px}.lab-controls output{font-size:25px;min-width:32px;text-align:right}.embedded-lab .lab-result{color:var(--accent);font-size:10px;margin:0 0 16px}.experiment-explain{border-top:1px solid var(--line);padding-top:16px}.century-nav{display:flex;gap:4px;flex-wrap:wrap;padding:0 20px}.century-nav button{font-size:11px;border-radius:3px;padding:8px 10px;color:var(--muted)}.century-nav button.active{color:var(--bg);background:var(--accent)}.time-overview{margin:18px 25px 8px;height:52px;position:relative}.time-line{height:1px;background:var(--line);position:absolute;left:0;right:0;top:15px}.time-point{position:absolute;top:6px;width:12px;height:20px;padding:0;transform:translateX(-50%)}.time-point:before{content:'';position:absolute;left:5px;top:4px;width:2px;height:11px;background:var(--c);opacity:.5}.time-point.active:before{height:20px;top:0;opacity:1;box-shadow:0 0 10px var(--c)}.time-point:hover:before{opacity:1;width:4px}.time-start,.time-end{position:absolute;top:35px;font-size:9px;color:var(--muted)}.time-start{left:0}.time-end{right:0}.chron-scroll{height:435px;overflow:auto;position:relative;scrollbar-width:thin;scrollbar-color:#526254 transparent;padding:0 20px 20px}.century-label{font-size:9px;text-transform:uppercase;letter-spacing:1.5px;color:var(--muted);padding:24px 0 12px 5px}.chron-row{width:100%;display:flex;align-items:center;gap:14px;text-align:left;padding:16px 10px;border-top:1px solid var(--line);border-radius:3px;position:relative}.chron-row.active{background:#2b3b2e;border:1px solid #627052;padding:15px 9px}.chron-row:hover{background:#223228}.chron-date{font:26px var(--serif);color:var(--accent);min-width:58px}.chron-dot{height:5px;width:5px;flex:none;background:var(--c);border-radius:50%}.chron-text{flex:1;min-width:0}.chron-text b{font:18px/1.25 var(--serif);font-weight:normal;display:block}.chron-text small{display:block;font-size:10px;color:var(--muted);margin-top:6px}.row-arrow{color:var(--muted);font-size:12px}.trail{display:flex;align-items:center;gap:9px;flex-wrap:wrap;min-height:55px;padding:17px 0;margin-top:16px;border-top:1px solid var(--line);font-size:10px}.trail>span:first-child{color:var(--muted);margin-right:10px}.trail button{color:var(--muted);padding:3px}.trail button[aria-current=step]{color:var(--accent)}.trail-arrow{color:#60756a}.empty{text-align:center;padding:35px 20px}.empty>span{font:40px var(--serif);color:var(--accent)}.empty h3{font:23px var(--serif);font-weight:normal}.empty p{font-size:12px}.empty .pill{margin-top:10px}.footer{margin-top:24px}.return-browse{display:none}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.node.faded{opacity:.12}.filter-container{min-height:43px}@media(min-width:1450px){.reader{max-height:790px}.map-svg{height:380px}}@media(max-width:1100px){.workspace{grid-template-columns:minmax(0,1fr) minmax(330px,1fr);gap:18px}.reader{padding:23px}.reader h2{font-size:29px}.mode-hint{font-size:10px;max-width:220px;line-height:1.6}.map-svg{min-width:520px}}@media(max-width:900px){.workspace{grid-template-columns:1fr}.reader-shell{position:static}.reader{max-height:none;padding:25px}.reader-shell{scroll-margin-top:20px}.return-browse{display:block;margin:0 0 14px;padding:10px 0;font-size:11px;color:var(--accent)}.map-svg{min-width:550px;height:340px}.chron-scroll{height:380px}.reader h2{font-size:34px}.embedded-lab canvas{height:300px}.mode-bar{position:sticky;top:0;z-index:5;background:var(--bg);padding:14px 0}.reader-tabs{position:static}.trail{margin-bottom:10px}.intro-actions{justify-content:flex-start}}@media(max-width:600px){header{padding:15px 5%;min-height:76px;height:auto;flex-wrap:nowrap}.brand b{font-size:16px}.brand small{font-size:8px;letter-spacing:1.4px}.mark{font-size:30px}.edition{display:none}.page{padding:27px 5% 30px}.intro h1{font-size:40px}.intro p{margin-top:19px}.intro-actions{margin-top:15px;margin-bottom:0}.mode-hint{display:none}.mode-switch{width:100%}.mode-switch button{flex:1;padding:10px 12px}.browse-intro h2{font-size:23px}.browse-panel{min-height:0}.map-svg{height:300px;min-width:560px}.map-invitation{padding:15px}.map-invitation b{font-size:18px}.browse-caption{padding:16px}.century-nav{padding:0 10px;gap:1px}.century-nav button{padding:7px 8px;font-size:10px}.chron-scroll{padding:0 10px 15px;height:360px}.chron-row{gap:9px;padding:16px 7px}.chron-row.active{padding:15px 6px}.chron-date{font-size:23px;min-width:51px}.chron-text b{font-size:17px}.reader{padding:22px 19px}.reader h2{font-size:30px}.reader-date{font-size:34px}.reader-formula{font-size:21px}.statement{padding:16px}.reader-intro{font-size:18px}.experience-callout{padding:14px;gap:12px}.experience-callout b{font-size:18px}.embedded-lab canvas{height:270px}.related-card small{font-size:11px}.footer{gap:15px}.trail{gap:5px}.mode-bar{margin:0 -1px}.filter{padding:7px 9px}.filter-container{min-height:0}.map-legend{font-size:9px}.reader-shell{scroll-margin-top:90px}}

/* Give the interactive experience the full stage, while retaining its discovery context. */
.lab-entry{background:var(--accent);color:var(--bg);border:1px solid var(--accent);padding:13px 20px;border-radius:4px;font-size:12px}.lab-entry:hover{filter:brightness(1.1)}.intro-actions{flex-wrap:wrap}.reader-tabs button[data-tab=experiment]{color:var(--accent);font-weight:600}.experience-callout{padding:24px 18px;border-color:#7c8760}.experience-callout small{color:var(--accent)}
body.immersive .intro,body.immersive .mode-bar,body.immersive .browser-shell,body.immersive .return-browse{display:none}body.immersive .workspace{display:block}body.immersive .reader-shell{position:static}body.immersive .reader{max-height:none;overflow:visible;background:none;border:0;padding:0}body.immersive .page{max-width:1600px;padding-top:25px}.stage-top{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:25px}.stage-back{font-size:12px;color:var(--accent);padding:8px 0}.stage-context{font-size:11px;color:var(--muted)}.stage-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:30px;margin-bottom:27px}.reader .stage-heading h2{font:clamp(35px,4vw,58px)/1.08 var(--serif);max-width:none;letter-spacing:-1.5px;margin:16px 0 0}.stage-heading p{max-width:300px;font-size:12px;color:var(--muted);line-height:1.8;margin:0}.stage-switch{display:flex;gap:8px;margin-bottom:24px;flex-wrap:wrap}.stage-switch button{padding:12px 18px;border:1px solid var(--line);border-radius:4px;color:var(--muted);font-size:11px}.stage-switch button.active{background:var(--panel);color:var(--accent);border-color:var(--accent)}.stage-switch span{font:20px var(--serif);margin-right:9px}.stage-grid{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:28px;align-items:start}.stage-canvas-wrap{border:1px solid var(--line);border-radius:6px;overflow:hidden;background:#0f1c17}.stage-canvas-top{display:flex;align-items:center;justify-content:space-between;gap:15px;padding:20px 24px;border-bottom:1px solid var(--line)}.stage-formula{font:23px var(--serif)}.stage-canvas-top button{font-size:10px;color:var(--muted);padding:8px 10px;border:1px solid var(--line);border-radius:3px;white-space:nowrap}.stage-canvas-wrap canvas{display:block;width:100%;height:clamp(350px,49vh,550px);background:radial-gradient(ellipse at center,#223a2b70,transparent 75%)}.stage-controls{background:var(--panel);padding:20px 24px 17px;border-top:1px solid var(--line)}.stage-controls .lab-controls{padding:0;background:transparent;gap:24px}.stage-controls label{font-size:12px}.stage-controls input{flex:1}.stage-controls output{font:35px var(--serif);color:var(--accent);min-width:58px}.stage-result{font-size:11px;line-height:1.7;color:var(--green);margin:10px 0 0}.stage-instructions{padding-top:7px}.stage-instructions .eyebrow{font-size:9px}.stage-instructions h3{font:25px/1.2 var(--serif);font-weight:normal;margin:18px 0 12px}.stage-instructions p{color:#b6c2b7;font-size:12px;line-height:1.9}.stage-instructions .proof{margin-top:24px}.stage-instructions .proof b{font-size:20px}.stage-return{display:block;color:var(--accent);font-size:11px;padding:14px 0;text-align:left}.stage-next{margin-top:28px;padding-top:22px;border-top:1px solid var(--line);display:grid;grid-template-columns:190px 1fr 1fr;gap:30px;align-items:center}.stage-next .eyebrow{font-size:9px}.stage-next .related-card{border:0;padding:4px 0}.stage-next .related-card b{font-size:21px}.stage-proof-note{font-size:10px;color:var(--muted);border-top:1px solid var(--line);padding-top:14px}
@media(max-width:1100px){.stage-grid{grid-template-columns:minmax(0,1fr) 245px;gap:22px}.stage-formula{font-size:20px}}@media(max-width:850px){.stage-grid{grid-template-columns:1fr}.stage-instructions{display:grid;grid-template-columns:1fr 1fr;gap:0 28px}.stage-instructions>.eyebrow{grid-column:1/-1}.stage-instructions .stage-side-body{grid-column:1}.stage-instructions .stage-side-proof{grid-column:2}.stage-next{grid-template-columns:1fr 1fr}.stage-next>.eyebrow{grid-column:1/-1}.stage-heading p{display:none}.stage-canvas-wrap canvas{height:420px}.stage-instructions .proof{margin-top:14px}}@media(max-width:600px){body.immersive .page{padding:18px 5% 28px}.stage-context{font-size:10px;max-width:120px;text-align:right}.stage-top{margin-bottom:20px}.stage-back{font-size:11px;text-align:left}.reader .stage-heading h2{font-size:38px}.stage-switch{gap:6px}.stage-switch button{padding:10px 11px;font-size:10px;flex:1}.stage-switch span{margin-right:5px;font-size:18px}.stage-canvas-top{padding:13px;gap:8px}.stage-formula{font-size:16px}.stage-canvas-top button{font-size:9px;padding:7px}.stage-canvas-wrap canvas{height:360px}.stage-controls{padding:16px}.stage-controls .lab-controls{gap:12px}.stage-controls label{font-size:11px}.stage-controls output{font-size:29px;min-width:38px}.stage-controls input{min-width:60px}.stage-result{font-size:10px}.stage-instructions{display:block}.stage-next{grid-template-columns:1fr;gap:20px}.stage-heading{margin-bottom:24px}.intro-actions{justify-content:flex-start}.stage-heading .eyebrow{font-size:9px}}
/* Complete collection and native reading rooms. */
.collection-tools{display:flex;align-items:center;justify-content:space-between;gap:15px;margin:0 0 18px;flex-wrap:wrap}.collection-tools label{font-size:10px;color:var(--muted);display:flex;gap:9px;align-items:center}.collection-tools select{border:1px solid var(--line);border-radius:3px;background:var(--panel);color:var(--fg);font:11px var(--sans);padding:9px;max-width:220px}.proof-filter input{accent-color:var(--accent)}.map-svg.catalog-map{height:auto;min-height:300px;min-width:600px}.catalog-map .node text{font-size:12px}.catalog-map .node .year{font-size:10px}.proof-star{fill:var(--accent)!important;font-size:12px!important}.map-pagination{display:flex;align-items:center;justify-content:space-between;gap:16px;border-top:1px solid var(--line);padding:15px 20px}.map-pagination button{border:1px solid var(--line);border-radius:50%;width:35px;height:35px}.map-pagination button:disabled{opacity:.25;cursor:default}.map-pagination span{text-align:center;font-size:11px}.map-pagination small{display:block;color:var(--muted);font-size:9px;margin-top:5px}.chron-scroll{height:480px}.chron-date.long-date{font:12px/1.5 var(--sans);max-width:85px;min-width:72px}.reader-date.long-date{font:16px/1.5 var(--serif);max-width:180px;text-align:right}.load-more{display:block;width:100%;padding:19px;color:var(--accent);border:1px solid var(--line);font-size:11px;margin-top:20px;border-radius:4px}.reading-paper{background:#f6f1e7;color:#28372e;border-radius:4px;--reading-zoom:1}.reading-paper>p{font:calc(18px * var(--reading-zoom))/1.85 Georgia,serif;margin:0 0 19px;overflow-wrap:anywhere}.reading-paper>h3{font:calc(23px * var(--reading-zoom))/1.5 Georgia,serif;margin:25px 0 16px;font-weight:bold}.math-fragment{margin:14px 0;overflow-x:auto;padding:2px 0}.math-fragment svg{display:block;width:calc(100% * var(--reading-zoom));height:auto;min-width:calc(480px * var(--reading-zoom));max-width:none}.portrait-fragment{margin:20px auto;max-width:100%;text-align:center}.portrait-fragment svg{margin:auto;width:270px;min-width:0;max-width:100%}.entry-preview{max-height:280px;overflow:hidden;position:relative;padding:20px;margin:20px 0 0;mask-image:linear-gradient(#000 80%,transparent)}.entry-preview .math-fragment svg{min-width:460px}.entry-preview>p{font-size:16px}.entry-preview>h3{font-size:19px}.read-entry{display:flex;align-items:center;justify-content:space-between;width:100%;padding:15px 0;color:var(--accent);font-size:12px;border-bottom:1px solid var(--line);margin-bottom:20px}.dossier-list{margin:25px 0}.dossier-list .eyebrow{font-size:9px}.dossier-link{display:flex;width:100%;gap:14px;align-items:center;text-align:left;padding:18px 0;border-bottom:1px solid var(--line)}.dossier-link>span:nth-child(2){flex:1}.dossier-symbol{font:28px var(--serif);color:var(--accent)}.dossier-link b{font:22px var(--serif);font-weight:normal;display:block}.dossier-link small{display:block;font-size:10px;color:var(--muted);margin-top:6px;line-height:1.6}.dossier-link:hover b{color:var(--accent)}.reading-layout{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:35px;align-items:start}.full-reading{padding:38px 44px;min-width:0;overflow:hidden}.reading-toc{position:sticky;top:25px}.reading-toc>.eyebrow{font-size:9px;margin-bottom:18px}.reading-toc>button[data-anchor]{display:block;width:100%;text-align:left;padding:14px 0;border-bottom:1px solid var(--line)}.reading-toc small{display:block;color:var(--accent);font-size:10px;margin-bottom:6px}.reading-toc span{font-size:12px;line-height:1.7}.reading-toc>p{font-size:12px;line-height:1.8;color:var(--muted)}.reading-toc .experience-callout{padding:14px}.reading-toc .experience-callout b{font-size:19px}.reading-controls{display:flex;gap:6px}.reading-controls button{font:17px Georgia,serif;border:1px solid var(--line);border-radius:3px;padding:10px 15px}.reading-notice{font-size:12px;color:var(--muted);line-height:1.8;margin:0 0 25px;max-width:750px}.reading-anchor{display:block;scroll-margin-top:25px}.loading{font-size:13px;color:var(--muted);padding:20px;line-height:1.8}.full-reading .loading{color:#526254}.reading-stage .continue-section{max-width:800px}.stage-switch{gap:6px}.stage-switch button{padding:10px 13px}.stage-switch span{font-size:18px}.stage-instructions .dossier-list{margin-top:20px}.stage-instructions .dossier-link b{font-size:19px}.filters{row-gap:7px}.filter{font-size:10px}.stage .continue-section{display:grid;grid-template-columns:190px 1fr 1fr;gap:28px;align-items:center}.stage .continue-section .place-in-time{grid-column:2/-1;padding:0}.stage .continue-section>.eyebrow{margin:0}.stage .continue-section .related-card{border:0}.reading-stage .stage-heading h2{font-size:clamp(30px,3.6vw,50px);max-width:950px}.footer{font-size:10px;line-height:1.9}
@media(max-width:1000px){.reading-layout{grid-template-columns:minmax(0,1fr) 200px;gap:22px}.full-reading{padding:28px}.stage-switch button{padding:10px 11px}}@media(max-width:800px){.reading-layout{display:flex;flex-direction:column}.reading-toc{position:static;order:-1;width:100%;display:flex;flex-wrap:wrap;gap:8px}.reading-toc>.eyebrow{width:100%;margin:0 0 8px}.reading-toc>button[data-anchor]{width:auto;border:1px solid var(--line);border-radius:4px;padding:9px;max-width:170px}.reading-toc>button[data-anchor] span{display:none}.reading-toc .experience-callout{width:100%;max-width:400px}.reading-toc .stage-return{display:none}.full-reading{width:100%}.reading-controls{flex-shrink:0}.stage .continue-section{grid-template-columns:1fr 1fr}.stage .continue-section>.eyebrow{grid-column:1/-1}}@media(max-width:600px){.collection-tools{gap:10px}.collection-tools select{font-size:10px;padding:8px;max-width:165px}.collection-tools label{font-size:9px}.filters{gap:4px}.filter{font-size:9px;padding:7px}.chron-scroll{height:420px}.chron-date.long-date{min-width:58px;max-width:60px;font-size:10px}.full-reading{padding:22px 16px}.reading-paper>p{font-size:calc(17px * var(--reading-zoom))}.reading-paper>h3{font-size:calc(21px * var(--reading-zoom))}.math-fragment{margin:13px -3px;scrollbar-width:thin}.math-fragment svg{min-width:calc(500px * var(--reading-zoom))}.portrait-fragment svg{min-width:0}.stage-switch button{flex:initial;padding:10px 12px;font-size:10px}.stage .continue-section{display:block}.stage .continue-section .related-card{padding:16px 0}.stage .continue-section .place-in-time{padding-top:10px}.reading-stage .stage-heading{align-items:flex-start;gap:15px}.reading-stage .stage-heading h2{font-size:30px}.reading-controls button{padding:8px;font-size:15px}.map-svg.catalog-map{min-width:660px}.entry-preview .math-fragment svg{min-width:470px}}
/* Manipulable proofs share the immersive laboratory stage. */
.proof-mode{display:flex;gap:6px;margin:8px 0 22px;border-bottom:1px solid var(--line);padding-bottom:18px}.proof-mode button{padding:12px 18px;border:1px solid var(--line);border-radius:5px;font-size:12px;color:var(--muted)}.proof-mode button[aria-pressed=true]{background:var(--fg);color:var(--bg)}.proof-mode button span{margin-left:12px;font-size:10px;opacity:.7}.guided-proof{display:grid;grid-template-columns:130px 1fr 150px;gap:24px;align-items:start;padding:24px 28px;margin-bottom:22px;border:1px solid #637458;border-radius:6px;background:#233027;min-height:176px}.guide-progress{display:flex;gap:6px}.guide-progress button{width:27px;height:27px;border-radius:50%;border:1px solid #677667;color:var(--muted);font-size:11px}.guide-progress button[aria-current=step]{background:var(--accent);border-color:var(--accent);color:var(--bg)}.guided-proof h3{font:28px var(--serif);margin:13px 0 9px}.guided-proof p{font-size:13px;line-height:1.85;color:#cbd4c9;margin:0;max-width:820px}.guide-nav{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:10px}.guide-nav button{font-size:11px;padding:8px;color:var(--accent)}.guide-nav button:disabled{opacity:.3;cursor:default}.proof-playground{border:1px solid var(--line);border-radius:7px;background:radial-gradient(ellipse at center,#20392c88,transparent 80%);overflow:hidden;padding:0 30px 25px;min-height:420px}.proof-formula{font:25px var(--serif);padding:23px 0;border-bottom:1px solid var(--line)}.proof-options{display:flex;flex-wrap:wrap;align-items:center;gap:25px;padding:22px 0}.proof-options label{display:flex;align-items:center;gap:12px;font-size:12px;color:var(--muted)}.proof-options select{font:14px var(--sans);background:var(--panel);color:var(--fg);border:1px solid #526254;border-radius:4px;padding:9px 16px}.proof-options button{font-size:11px;color:var(--accent);margin-left:auto}.proof-options output{font:23px var(--serif);color:var(--accent);min-width:35px}.proof-options input{accent-color:var(--accent);width:200px}.residue-cloud{display:flex;flex-wrap:wrap;justify-content:center;gap:12px;padding:20px 0;min-height:140px}.residue{width:85px;height:88px;border:1px solid #5f7765;border-radius:8px;background:#172720;transition:transform .3s,opacity .3s,background .3s}.residue b{display:block;font:32px var(--serif);font-weight:normal}.residue small{display:block;color:var(--muted);font-size:9px;margin-top:8px}.residue.lit{border-color:var(--accent);background:#4e4830;transform:translateY(-5px)}.residue.paired{opacity:.35;transform:scale(.9)}.residue.self-inverse{border-color:var(--accent);box-shadow:0 0 25px #edb38b22;color:var(--accent)}.interaction-hint{font-size:12px;color:var(--muted);line-height:1.8;text-align:center;min-height:25px}.pair-shelf{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:12px;min-height:95px;padding:20px 0;border-top:1px dashed var(--line)}.pair-shelf>span{font-size:12px;color:var(--muted)}.pair-token{border:1px solid #4a6150;border-radius:5px;padding:12px 20px;background:#263b2c;font:20px var(--serif);animation:proof-appear .3s ease-out}.pair-token small{display:block;font:9px var(--sans);color:var(--muted);margin-top:6px}.pair-token.single{border-color:var(--accent);color:var(--accent)}.proof-result{border-top:1px solid var(--line);padding:23px 0 0;font:24px/1.5 var(--serif);text-align:center;color:var(--accent)}.proof-result small{font:12px/1.7 var(--sans);color:var(--muted)}.group-elements{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin:25px 0}.group-elements button{width:43px;height:43px;border:1px solid var(--line);border-radius:50%;font:21px var(--serif);color:var(--muted)}.group-elements button.chosen{border-color:var(--group-color);color:var(--group-color);background:#ffffff09}.coset-shelf{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:12px;margin:25px 0}.coset{border:1px dashed var(--line);border-radius:5px;padding:15px;opacity:.25;transition:opacity .35s,transform .35s;transform:translateY(8px)}.coset.assembled{opacity:1;transform:translateY(0);border:1px solid var(--group-color);background:#ffffff04}.coset.chosen{box-shadow:inset 0 0 0 1px var(--group-color);opacity:1}.coset>span{font:20px var(--serif);color:var(--group-color)}.coset>div{display:flex;flex-wrap:wrap;gap:8px;margin:15px 0}.coset b{font:20px var(--serif);color:var(--group-color);padding:3px}.coset small{font-size:10px;color:var(--muted)}.assemble-button{display:block;margin:0 auto 24px;border:1px solid var(--accent);border-radius:5px;color:var(--accent);padding:13px 20px;font-size:12px}.assemble-button:disabled{opacity:.4}.condensation-chart svg{display:block;width:100%;height:auto;min-height:230px}.bounds-table{overflow-x:auto;margin:10px 0 25px}.bounds-table table{border-collapse:collapse;width:100%;font-size:12px;text-align:right}.bounds-table th,.bounds-table td{padding:10px 14px;border-bottom:1px solid var(--line);font-variant-numeric:tabular-nums}.bounds-table th{font-weight:400;color:var(--muted);font-size:10px}.bounds-table caption{text-align:left;color:var(--muted);padding:12px;font-size:11px}.proof-context{display:grid;grid-template-columns:1fr 1fr;gap:50px;margin-top:25px}.proof-context>p{font-size:13px;line-height:1.9;color:var(--muted);max-width:650px}.proof-context .dossier-list{margin:0}@keyframes proof-appear{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
@media(max-width:850px){.guided-proof{grid-template-columns:1fr;gap:16px}.guide-nav{justify-content:space-between}.proof-context{grid-template-columns:1fr;gap:10px}.proof-playground{padding:0 20px 22px}.residue{width:70px;height:78px}.proof-mode{flex-wrap:wrap}.proof-options{gap:16px}.proof-options input{width:130px}}@media(max-width:500px){.proof-mode button{padding:10px;font-size:11px}.proof-mode button span{display:none}.guided-proof{padding:19px}.guided-proof h3{font-size:25px}.proof-playground{padding:0 14px 18px}.proof-formula{font-size:21px;line-height:1.5}.residue-cloud{gap:9px}.residue{width:60px;height:71px}.residue b{font-size:27px}.residue small{font-size:8px}.proof-result{font-size:21px}.pair-token{font-size:18px;padding:10px}.coset-shelf{grid-template-columns:1fr 1fr;gap:8px}.coset{padding:12px}.coset b{font-size:18px}.bounds-table th,.bounds-table td{padding:10px 7px;font-size:10px}.condensation-chart{overflow-x:auto}.condensation-chart svg{min-width:560px}.proof-options label{font-size:11px}}
@media(prefers-reduced-motion:reduce){.residue,.coset{transition:none}.pair-token{animation:none}}
.coset.assembled{animation:proof-appear .35s ease-out}@media(prefers-reduced-motion:reduce){.coset.assembled{animation:none}}
/* A chronological collection of proofs, with historical context kept distinct. */
.collection-choice{display:flex;gap:6px;flex-wrap:wrap;margin:0 0 16px}.collection-choice button{font-size:11px;padding:10px 14px;border:1px solid var(--line);border-radius:4px;color:var(--muted)}.collection-choice button.active{color:var(--bg);background:var(--green);border-color:var(--green)}.entry-kind{display:inline-block;font-size:10px;letter-spacing:.8px;color:var(--muted);border:1px solid var(--line);border-radius:20px;padding:7px 12px;margin:0 0 15px}.entry-kind.is-proof{color:var(--accent);border-color:#6c6246}.decisive-idea{border-left:2px solid var(--accent);padding:7px 0 7px 20px;margin:25px 0}.decisive-idea .eyebrow{font-size:9px}.decisive-idea p{font:20px/1.6 var(--serif);color:var(--fg);margin:12px 0 0}.chron-row.has-proof .chron-text small{color:#b3c9b8}.proof-journey{border-top:1px solid var(--line);padding-top:23px;margin:28px 0}.proof-journey>.eyebrow{font-size:9px}.proof-journey>div:last-child{display:grid;grid-template-columns:1fr 1fr;gap:15px;margin-top:15px}.proof-journey button{text-align:left;border:1px solid var(--line);border-radius:5px;padding:14px;min-width:0}.proof-journey button:hover{border-color:var(--accent)}.proof-journey small{display:block;font-size:10px;color:var(--accent);margin-bottom:9px}.proof-journey b{display:block;font:19px var(--serif)}.proof-journey button span{display:block;font-size:10px;line-height:1.7;color:var(--muted);margin-top:8px}.reading-stage .proof-journey{max-width:800px}.collection-tools{justify-content:flex-start}.reader .proof[open]{border-color:#65745a}.reader .proof[open] summary{margin-bottom:12px}
@media(max-width:600px){.proof-journey>div:last-child{gap:8px}.proof-journey button{padding:10px}.proof-journey b{font-size:17px}.decisive-idea p{font-size:19px}}

/* The chronological table of contents is now the only browsing surface. */
#exploration{border-top:1px solid var(--line);padding-top:30px}.back-to-contents{border-top:1px solid var(--line);padding-top:18px;margin-top:24px}.back-to-contents button{color:var(--muted);font-size:11px;padding:8px 0}.back-to-contents button:hover{color:var(--accent)}body.immersive #exploration{border-top:0;padding-top:0}.reader-shell{scroll-margin-top:20px}.reading-stage .back-to-contents{max-width:800px}@media(max-width:600px){#exploration{padding-top:24px}.collection-choice button{padding:10px;font-size:10px}}