:root{color-scheme:dark;--bg:#312047;--panel:#21152e;--raised:#2b1d3b;--ink:#f5ecfc;--muted:#c2b2d2;--line:#634977;--positive:#65d6e8;--negative:#ffbd83;--degree:#d8acff;--pair:#c2e995;--gold:#ffd36f;--math-scale:1}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.5 system-ui,-apple-system,sans-serif}a{color:inherit}button,input,select{font:inherit}button,select{background:#21152e;color:var(--ink);border:1px solid #89699f;border-radius:7px;padding:8px 12px;min-height:38px}button{cursor:pointer}button:hover{background:#473155}button:disabled{opacity:.5;cursor:default}button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible,a:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--gold);outline-offset:3px}input[type=range]{accent-color:var(--pair);width:100%;height:24px;margin:5px 0}select{width:100%;font-size:13px}label{display:block;font-weight:600;font-size:13px}output{font-variant-numeric:tabular-nums;color:var(--pair)}h1,h2,h3,h4{line-height:1.2}h1{font-size:clamp(28px,3.2vw,46px);letter-spacing:-.035em;margin:9px 0 12px;font-weight:720}h2{font-size:21px;margin:0 0 8px}h3{font-size:16px;margin:0 0 8px}h4{font-size:14px;margin:18px 0 8px}p{margin:0 0 12px}small{font-size:12px}.site-header{padding:14px max(22px,calc((100vw - 1516px)/2));display:flex;gap:20px;justify-content:space-between;background:#1d1329;border-bottom:1px solid #533966;font-size:13px}.site-header>a{font-weight:650;text-decoration:none}.site-header nav{display:flex;gap:22px}.site-header nav a{text-decoration:none;color:var(--muted)}.site-header nav a[aria-current]{color:var(--pair)}main{max-width:1560px;padding:28px 22px;margin:auto}.skip{position:absolute;left:20px;top:-60px;background:var(--panel);padding:12px;z-index:20}.skip:focus{top:12px}.intro{display:grid;grid-template-columns:1fr minmax(380px,.95fr);gap:32px;align-items:center;margin-bottom:28px}.intro p{color:#dfd0eb}.eyebrow{font-size:11px;font-weight:750;letter-spacing:.08em}.eyebrow span{color:#bba2ce;margin-left:14px}.hero-identity{background:#22152f;border:1px solid #68457e;border-radius:12px;padding:20px;font-size:clamp(15px,1.5vw,20px);overflow-x:auto}.hero-identity small{display:block;color:var(--muted);margin-top:12px;font-size:13px}.workspace{display:grid;grid-template-columns:246px minmax(0,1fr);gap:20px;align-items:start}.controls{position:sticky;top:16px;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:18px}.controls h2{font-size:18px;margin-bottom:15px}.control{margin-top:17px}.control label{display:flex;justify-content:space-between;gap:8px}.hint{font-size:12px;color:var(--muted);line-height:1.5;margin:3px 0 0}.controls fieldset{min-width:0;border:0;border-top:1px solid var(--line);padding:13px 0 0;margin:23px 0 17px}.controls legend{font-size:13px;font-weight:650;padding-right:6px}.controls fieldset .control{margin-top:12px}.amplitude-intro{font-size:15px;margin-bottom:0}.button-row{display:flex;gap:6px}.button-row button{font-size:12px;flex:1;padding:6px}.button-row #play{flex:2;color:#1c2b14;background:var(--pair);border-color:var(--pair)}button.wide{width:100%;margin-top:8px}.quiet{border-color:transparent;color:var(--muted)}.lab{min-width:0}.tabs{display:grid;grid-template-columns:repeat(3,1fr);gap:7px;margin-bottom:12px}.tabs button{font-size:14px;padding:10px 7px}.tabs [aria-selected=true]{background:#ead5ff;color:#23132e;border-color:#ead5ff;font-weight:650}.selection-strip{padding:9px 13px;border-left:3px solid var(--gold);background:#251831;color:#f5ddb0;border-radius:5px;font-size:13px;font-variant-numeric:tabular-nums}.section-intro{margin:23px 0 18px}.section-intro p{color:var(--muted);max-width:90ch;font-size:14px}.lattice-layout{display:grid;grid-template-columns:1.08fr 1fr;gap:16px;align-items:stretch}.card{min-width:0;background:var(--panel);border:1px solid var(--line);border-radius:11px;padding:18px}.card-heading{display:flex;justify-content:space-between;align-items:flex-start;gap:8px;margin-bottom:8px}.card-heading h3{margin:0}.badge{color:var(--muted);font-size:11px;white-space:nowrap;border:1px solid #674b7d;border-radius:20px;padding:3px 8px}.small{font-size:11px;min-height:28px;padding:3px 7px;white-space:nowrap}.legend{display:flex;gap:6px 15px;flex-wrap:wrap;font-size:11px;margin:12px 0 4px;font-weight:600}.degree-key{color:var(--degree)}.positive-key{color:var(--positive)}.negative-key{color:var(--negative)}.pair-key{color:var(--pair)}.selected-key{color:var(--gold)}svg[id$="-plot"]{width:100%;height:auto;display:block;overflow:hidden}svg text{font-family:system-ui,sans-serif;font-size:12px;fill:var(--muted)}svg .axis{stroke:#a58db8;stroke-width:1}svg .grid{stroke:#493354;stroke-width:1}svg .plot-label{fill:#edddfa;font-weight:600;font-size:13px}svg .point{cursor:pointer}svg .point:focus{outline:none}svg .point:focus .point-head{stroke:var(--gold);stroke-width:4}svg .value-label{font-weight:650;paint-order:stroke fill;stroke:var(--panel);stroke-width:4px;stroke-linejoin:round}.plot-note{font-size:12px;color:var(--muted);margin:0}.math-block{overflow-x:auto;overflow-y:hidden;font-size:16px;padding:9px 0;min-width:0}.math-block mjx-container{margin:0!important}.metric-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:12px 0}.metric-grid>div{padding:10px;background:var(--raised);border-radius:6px}.metric-grid span{display:block;font-size:11px;color:var(--muted)}.metric-grid strong{font-size:19px;line-height:1.6;font-variant-numeric:tabular-nums}.table-scroll{overflow:auto;max-height:270px}table{border-collapse:collapse;width:100%;font-size:12px;text-align:right;font-variant-numeric:tabular-nums}th,td{padding:7px 8px;border-bottom:1px solid #503860}th{position:sticky;top:0;background:var(--panel);font-weight:600;color:var(--muted)}td button{font-size:11px;min-height:27px;padding:2px 8px}tr[aria-selected=true]{background:#46354b;box-shadow:inset 3px 0 var(--gold)}.spectrum-card{margin-top:16px}.spectrum-card .math-block{font-size:14px;border-top:1px solid #493354;margin-top:10px}.geometry-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.numeric{font:12px/1.5 ui-monospace,SFMono-Regular,monospace;color:#e8d7f6;margin:12px 0 6px;overflow-wrap:anywhere}.check-note{font-size:11px;color:var(--pair);border-left:2px solid var(--pair);padding-left:9px;margin-top:12px}.mapping-card{display:grid;grid-template-columns:1fr 1.15fr;gap:20px;align-items:center;margin-top:16px}.mapping-card p{font-size:13px;color:var(--muted)}.mapping-card .math-block{font-size:14px}.derivation{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px}.derivation .card{padding:16px}.step-number{display:block;color:var(--pair);font:12px ui-monospace,monospace;margin-bottom:9px}.derivation p{font-size:12px;color:var(--muted);margin:8px 0 0}.derivation .math-block{font-size:13px}.convergence{margin-top:16px}.series-controls{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin:20px 0 14px}.series-controls label{display:flex;flex-wrap:wrap;justify-content:space-between;gap:6px}.convergence-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;align-items:center}.convergence-grid .math-block{font-size:14px}.series-readout{font-size:12px;margin:12px 0}.series-readout dt{color:var(--muted);margin-top:12px}.series-readout dd{font:14px ui-monospace,monospace;margin:3px 0 0;color:var(--degree);overflow-wrap:anywhere}.series-readout dd:nth-of-type(2){color:var(--pair)}.proof{margin-top:16px;font-size:14px}.proof p{margin:14px 0 8px}.proof .math-block{font-size:15px}summary{cursor:pointer;font-weight:600}.amplitude-note{border-left:3px solid var(--degree);padding:18px 20px;margin-top:24px;background:#281a36;border-radius:0 9px 9px 0}.amplitude-note h3{color:var(--degree)}.amplitude-note p{font-size:13px;color:var(--muted);margin-top:10px;max-width:95ch}.amplitude-equation{overflow-x:auto;font-size:16px;padding:10px 0}.amplitude-note summary{font-size:12px;color:var(--muted)}footer{display:flex;justify-content:space-between;gap:24px;font-size:11px;color:var(--muted);padding:25px 0 8px}footer details{max-width:650px}footer p{margin-top:10px}#app-error{padding:14px;background:#562a3a;color:#ffe1e8;border-radius:8px;margin-bottom:15px}[hidden]{display:none!important}
@media(min-width:1700px){main{max-width:1660px}.workspace{grid-template-columns:260px minmax(0,1fr)}}
@media(max-width:1100px){main{padding:22px 15px}.workspace{grid-template-columns:215px minmax(0,1fr);gap:14px}.controls{padding:13px}.intro{grid-template-columns:1fr;gap:12px}.hero-identity{font-size:17px;width:fit-content;max-width:100%}.lattice-layout{grid-template-columns:1fr 1fr}.card{padding:13px}.tabs button{font-size:12px}.derivation{grid-template-columns:1fr}.derivation .card{display:block}.geometry-grid{grid-template-columns:1fr}.mapping-card{grid-template-columns:1fr}.geometry-grid svg[id$="-plot"]{max-height:430px}.convergence-grid{grid-template-columns:1fr}.series-controls{grid-template-columns:1fr}.lattice-layout .card-heading{flex-wrap:wrap}.badge{white-space:normal}.term-card .math-block{font-size:14px}.table-scroll{max-height:260px}}
@media(max-width:760px){.site-header{padding:12px;flex-wrap:wrap;gap:8px}.site-header nav{gap:15px;font-size:11px}main{padding:20px 12px}.intro{margin-bottom:20px}.eyebrow span{display:block;margin:4px 0 0}.intro p{font-size:13px}.hero-identity{font-size:14px;padding:14px;width:100%}.hero-identity small{font-size:11px}.workspace{grid-template-columns:1fr}.controls{position:static;display:grid;grid-template-columns:1fr 1fr;gap:12px 20px;padding:16px}.controls h2,.controls>label,.controls>select,.controls fieldset{grid-column:1/-1;margin:0}.controls .control{margin:0}.controls .time-control{grid-column:1/-1}.controls fieldset{display:grid;grid-template-columns:1fr 1fr;gap:10px 20px;margin-top:8px;padding-top:12px}.controls fieldset>p{grid-column:1/-1}.controls button.wide{margin:0}.tabs{gap:5px;margin-top:5px}.tabs button{padding:8px 5px;font-size:11px;min-height:42px}.lattice-layout{grid-template-columns:1fr}.metric-grid{grid-template-columns:repeat(4,1fr)}.metric-grid>div{padding:8px 5px}.metric-grid strong{font-size:16px}.metric-grid span{font-size:10px}.section-intro{margin-top:18px}.section-intro h2{font-size:19px}.section-intro p{font-size:13px}.spectrum-card .card-heading{display:block}.spectrum-card .badge{display:inline-block;margin-top:8px}.card svg[id$="-plot"]{min-width:0}.spectrum-card{padding:12px 6px}.spectrum-card h3,.spectrum-card .hint,.spectrum-card .legend{margin-left:6px}.amplitude-note{padding:15px 12px}.amplitude-equation{font-size:14px}.series-controls{gap:12px}.convergence-grid{gap:8px}.mapping-card{gap:8px}footer{display:block}footer details{margin-top:14px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}

/* A shared workspace reuses the same cards, controls and mathematical state. */
.tabs{grid-template-columns:repeat(4,minmax(0,1fr))}
.together-view .intro{margin-bottom:18px;gap:20px}.together-view h1{font-size:30px}.together-view .intro>div>p:last-child{display:none}.together-view .hero-identity{padding:12px 18px;font-size:16px}.together-view .hero-identity small{font-size:11px;margin-top:6px}
.together-intro{margin:15px 0 10px}.together-intro h2{font-size:20px}.together-intro p,.together-explanation{font-size:12px;color:var(--muted);margin-bottom:8px}
.together-time{display:flex;align-items:center;gap:12px;padding:8px 12px;background:var(--panel);border:1px solid var(--line);border-radius:8px;margin-bottom:8px}.together-time button{background:var(--pair);color:#1c2b14;white-space:nowrap;padding:5px 10px;min-height:32px;font-size:12px}.together-time label{white-space:nowrap;font-size:12px}.together-time input{flex:1;min-width:60px;margin:0}.together-time output{min-width:52px;text-align:right;font-size:13px}
.live-bridge{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr) auto minmax(0,1fr);gap:10px;align-items:center;background:#251831;padding:9px 12px;border-radius:8px;border-left:3px solid var(--gold)}.live-bridge>div{min-width:0}.live-bridge span:not(.bridge-operation){display:block;font-size:11px;color:var(--muted)}.live-bridge strong{font:12px/1.6 ui-monospace,SFMono-Regular,monospace;overflow-wrap:anywhere}.bridge-operation{color:var(--gold);font-size:18px}#bridge-contribution{color:var(--gold)}#together-partner{margin:6px 0 12px}
.together-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:14px}.together-grid>div{min-width:0}.together-grid .card{height:100%;margin:0;padding:13px}.together-grid .card-heading{margin-bottom:6px}.together-grid h3{font-size:15px}.together-grid .legend{font-size:10px;gap:8px}.together-grid svg[id$="-plot"]{max-height:350px;display:block;margin:0 auto}.together-grid #spectrum-plot{max-height:230px}.together-grid .numeric{font-size:11px;margin:7px 0 5px}.together-grid .hint,.together-grid .plot-note{font-size:11px}.together-grid .math-block{font-size:13px;padding:6px 0}.together-grid .check-note{font-size:10px;margin-top:6px}.together-details{margin-top:14px;border:1px solid var(--line);border-radius:8px;background:var(--panel);padding:12px}.together-details>summary{font-size:13px;color:var(--muted)}#together-details-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:14px;margin-top:12px}#together-details-grid .mapping-card{display:block;margin:0}#together-details-grid .card{min-width:0}
@media(max-width:1100px){.together-view .workspace{grid-template-columns:190px minmax(0,1fr);gap:12px}.together-view .controls{padding:11px}.together-view .intro{grid-template-columns:1fr}.together-view .hero-identity{display:none}.together-view .eyebrow{margin-bottom:5px}.together-view h1{margin-bottom:3px}.together-grid{gap:10px}.together-grid .card{padding:10px}.together-grid svg[id$="-plot"]{max-height:260px}.together-grid .card-heading{flex-wrap:wrap}.live-bridge{gap:6px;padding:8px}.live-bridge strong{font-size:11px}.tabs button{font-size:11px}.together-time{gap:8px}}
@media(max-width:760px){.together-view .workspace{grid-template-columns:1fr}.tabs{grid-template-columns:repeat(2,minmax(0,1fr))}.together-grid{grid-template-columns:1fr}.together-grid svg[id$="-plot"]{max-height:300px}.together-time{flex-wrap:wrap}.together-time button{flex:1}.together-time label{flex:1;text-align:right}.together-time input{flex-basis:70%}.together-time output{flex:0 0 52px}.live-bridge{grid-template-columns:minmax(0,1fr) auto minmax(0,1fr)}.live-bridge .bridge-operation:nth-of-type(2){grid-column:1;text-align:right}.live-bridge>div:last-child{grid-column:2/-1}#together-details-grid{grid-template-columns:1fr}.together-view .controls{padding:16px}}
.series-view-controls{display:flex;align-items:center;gap:12px;margin:18px 0 8px;flex-wrap:wrap}.series-view-controls>label:first-child{display:flex;gap:12px;white-space:nowrap}.series-view-controls>input{flex:1;min-width:100px;width:auto}.series-view-controls button{font-size:12px}.series-view-controls .check-label{display:flex;gap:7px;align-items:center;font-weight:400;font-size:12px}.series-view-controls input[type=checkbox]{accent-color:var(--pair)}.convergence-grid{grid-template-columns:minmax(0,1.4fr) minmax(0,1fr)}#series-plot{min-height:300px;max-height:520px;margin:10px auto}#series-view-note{margin-bottom:12px}
@media(max-width:1100px){.convergence-grid{grid-template-columns:1fr}#series-plot{min-height:0;max-height:460px}}

/* Contextual guides stay with their card when the linked layout moves it. */
.explanation-open{display:block;width:fit-content;max-width:100%;white-space:normal;text-align:left;font-size:12px;line-height:1.4;padding:7px 10px;min-height:34px;margin:10px 0 14px;color:#e7f3d7;border-color:#7e9467;background:#2c2635}
.explanation-open:hover{background:#3e3c42;border-color:var(--pair)}
.jl-window-body .intuitive-explanation h3{font-size:1.2em;color:var(--degree);margin-top:.4em}
.jl-window-body .intuitive-explanation h4{font-size:1em;margin:0 0 .5em;color:var(--gold)}
.explanation-now{border-left:3px solid var(--gold);background:#35253f;padding:.8em 1em;margin:1.2em 0;overflow-wrap:anywhere;font-variant-numeric:tabular-nums}
.jl-window-body .explanation-now p{margin:.3em 0}
.jl-window-body .explanation-try{border-top:1px solid var(--line);padding-top:1em;margin-top:1.2em}
.jl-window-body .explanation-try strong{color:var(--pair)}

/* The thesis walkthrough has its own panels; existing exploration cards keep their homes. */
.tabs{grid-template-columns:repeat(5,minmax(0,1fr))}
.lesson-scope{border-left:3px solid var(--pair);background:var(--panel);padding:12px 16px;margin:0 0 20px;display:flex;flex-wrap:wrap;gap:6px 24px;font-size:13px;color:var(--muted)}
.lesson-scope .scope-current{color:var(--pair);font-weight:600}
.lesson-scope details{flex-basis:100%;margin-top:4px}.lesson-scope details p{margin:10px 0 0;max-width:100ch}.lesson-scope code{overflow-wrap:anywhere}
.lesson-view #amplitude-controls,.lesson-view .amplitude-note,.lesson-view #display-math{display:none}
.lesson-view .intro{grid-template-columns:1.1fr 1fr;gap:24px;margin-bottom:18px}
.lesson-view .intro h1{font-size:clamp(25px,2.5vw,36px)}
.lesson-view .controls{max-height:calc(100vh - 32px);overflow-y:auto}
#laurent-lesson{min-width:0;margin-top:16px;container-type:inline-size}
#laurent-lesson .ll-nav{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;margin-bottom:16px}
#laurent-lesson .ll-nav button{text-align:left;min-height:48px;font-size:13px}
#laurent-lesson .ll-nav [aria-pressed=true]{background:var(--pair);color:#1c2b14;border-color:var(--pair);font-weight:650}
#laurent-lesson .ll-step{min-width:0}
#laurent-lesson .ll-step>p{max-width:88ch;color:var(--muted);font-size:14px}
#laurent-lesson .ll-two{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:18px;align-items:start}
#laurent-lesson .ll-two>*{min-width:0}
#laurent-lesson .ll-figure{margin:12px 0;min-width:0}
#laurent-lesson .ll-figure>svg{display:block;width:100%;height:auto;overflow:hidden}
#laurent-lesson .ll-figure figcaption{font-size:14px;overflow-x:auto;overflow-y:hidden;text-align:center;padding:7px 0}
#laurent-lesson svg text{font-size:13px;fill:var(--muted)}
#laurent-lesson .ll-toolbar,#laurent-lesson .ll-presets{display:flex;flex-wrap:wrap;align-items:center;gap:9px;margin:12px 0}
#laurent-lesson .ll-toolbar select{width:auto;max-width:100%}
#laurent-lesson .ll-presets button{font-size:12px}
#laurent-lesson .ll-metrics{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:10px 0}
#laurent-lesson .ll-metrics>*{min-width:0;overflow-wrap:anywhere}
#laurent-lesson .ll-support{display:flex;flex-wrap:wrap;gap:6px;margin:12px 0}
#laurent-lesson .ll-term-chip{font-size:12px;min-height:40px}
#laurent-lesson .ll-term-chip[aria-pressed=true]{border-color:var(--gold);box-shadow:inset 0 -2px var(--gold)}
#laurent-lesson .ll-proof{margin:16px 0;padding:12px 14px;border-left:2px solid var(--degree);background:var(--panel)}
#laurent-lesson .ll-proof p{font-size:14px;margin:12px 0 5px}
#laurent-lesson .ll-status{padding:9px 12px;border-left:3px solid var(--gold);background:var(--raised);font-size:13px;margin:12px 0;overflow-wrap:anywhere}
#laurent-lesson .ll-formula{overflow-x:auto;overflow-y:hidden;max-width:100%;padding:10px 0;font-size:17px}
#laurent-lesson .ll-formula mjx-container{margin:0!important}
@media(max-width:1100px){.lesson-view .intro{grid-template-columns:1fr}.tabs{grid-template-columns:repeat(3,minmax(0,1fr))}#laurent-lesson .ll-nav{grid-template-columns:repeat(2,minmax(0,1fr))}}
@container(max-width:640px){#laurent-lesson .ll-two{grid-template-columns:1fr}}
@media(max-width:760px){.lesson-view .controls{max-height:none;overflow:visible}.tabs{grid-template-columns:repeat(2,minmax(0,1fr))}.lesson-scope{padding:11px 12px;font-size:12px}#laurent-lesson .ll-metrics{grid-template-columns:1fr}#laurent-lesson .ll-formula{font-size:15px}}

/* Native links make the complete lesson card a mouse/keyboard target. */
.thesis-switcher{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;width:100%;flex-basis:100%}.thesis-switcher>a{display:flex;flex-direction:column;justify-content:center;gap:4px;min-height:62px;padding:12px 16px;border:1px solid #a287b6;border-radius:8px;background:#21152e;color:var(--ink);text-decoration:none;cursor:pointer;line-height:1.35}.thesis-switcher>a span{font-size:15px;font-weight:650}.thesis-switcher>a small{font-size:12px;color:var(--muted)}.thesis-switcher>a:hover{background:#483254;border-color:var(--gold)}.thesis-switcher>a[aria-current=page]{background:#c2e995;color:#213219;border-color:#c2e995}.thesis-switcher>a[aria-current=page] small{color:#354d29}.thesis-switcher>a:focus-visible{outline:3px solid var(--gold);outline-offset:3px}@media(max-width:520px){.thesis-switcher{grid-template-columns:1fr}.thesis-switcher>a{min-height:56px;padding:10px 13px}}