:root{color-scheme:light;--paper:#f5f3eb;--ink:#203d36;--muted:#63736a;--rule:#d5dbd0;--teal:#2c6154;--coral:#b6513b;--gold:#f2d28a;font-family:Arial,Helvetica,sans-serif;font-synthesis:none}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink)}button,input,select{font:inherit}button,summary,select{cursor:pointer}button:focus-visible,input:focus-visible,summary:focus-visible,select:focus-visible,canvas:focus-visible{outline:3px solid #c67b43;outline-offset:4px}button{color:var(--ink);border:1px solid var(--rule);background:transparent;border-radius:5px;padding:9px 14px}button:hover{background:#e8ece2}button.primary{background:var(--ink);border-color:var(--ink);color:var(--paper)}button.primary:hover{background:var(--teal)}main{max-width:1192px;padding:0 40px;margin:auto}.masthead{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--rule);padding:25px 0;font-size:12px;letter-spacing:.04em}.masthead a{color:var(--ink);text-decoration:none;font-weight:700;letter-spacing:.13em;text-transform:uppercase}.masthead>span{color:var(--muted)}.edition{margin-left:22px}.introduction{position:relative;padding:46px 0 35px;display:grid;grid-template-columns:1.15fr 1fr;gap:0 56px;align-items:end}.eyebrow{font-size:10px;letter-spacing:.16em;text-transform:uppercase;font-weight:700;line-height:1.6;color:var(--teal);margin:0 0 14px}.introduction .eyebrow{grid-column:1/-1}h1,h2,h3,p{margin-top:0}h1{font-family:Georgia,'Times New Roman',serif;font-weight:400;font-size:clamp(36px,4.3vw,55px);line-height:1.08;letter-spacing:-.045em;margin-bottom:0}.standfirst{font-size:16px;line-height:1.65;max-width:420px;margin:0 0 3px;color:#50645a}.chapters{display:flex;gap:8px;border-top:1px solid var(--rule);padding:19px 0 24px}.chapters button{border-color:transparent;border-radius:4px;padding:11px 18px;font-size:13px}.chapters button span{margin-right:12px;color:var(--muted);font-size:11px}.chapters button[aria-pressed=true]{background:#e2e9dc;border-color:#cad5c1}.chapters button[aria-pressed=true] span{color:var(--teal)}.laboratory{display:grid;grid-template-columns:minmax(0,1fr) 295px;gap:34px;align-items:start}.arena-column{min-width:0}.arena-wrap{position:relative;background:#94b5a1;border-radius:5px;overflow:hidden;aspect-ratio:1}.arena-wrap canvas{display:block;width:100%;height:100%;touch-action:none;cursor:crosshair}.arena-topline{position:absolute;left:20px;right:20px;top:18px;display:flex;justify-content:space-between;pointer-events:none;color:#f8f8e8;font-size:11px;text-shadow:0 1px 4px #24483c}.arena-topline>span{background:#163f39a8;padding:6px 9px;border-radius:3px}.live-dot::before{display:inline-block;content:'';width:5px;height:5px;background:#bddd9c;border-radius:50%;margin:0 6px 1px 0}.live-dot.paused::before{background:#f2d28a}.arena-hint{position:absolute;bottom:17px;left:0;right:0;text-align:center;color:#f3f4e2;font-size:11px;pointer-events:none;text-shadow:0 1px 5px #123d35}.transport{display:flex;align-items:center;gap:13px;padding:14px 0;border-bottom:1px solid var(--rule);font-size:11px}.transport-actions{display:flex;gap:6px}.transport button{padding:8px 12px;font-size:12px}.transport output{margin-left:auto;font-variant-numeric:tabular-nums;color:var(--muted);white-space:nowrap}.playback{display:flex;align-items:center;gap:6px;color:var(--muted);margin-left:auto}.playback select{border:0;background:transparent;padding:4px;color:var(--ink);font-size:12px}.arena-key{display:flex;align-items:center;gap:18px;flex-wrap:wrap;color:var(--muted);font-size:11px;padding:16px 0 8px}.arena-key>span,.arena-key label{display:flex;align-items:center;gap:6px}.arena-key label{margin-left:auto}.swatch{display:inline-block;width:8px;height:8px;border-radius:50%;border:1px solid #547566}.slow{background:#b6e4d5}.fast{background:#f0cb85}.live-summary{font-size:12px;color:var(--muted);line-height:1.55;margin:3px 0 0}.controls{padding-top:1px}.controls>.eyebrow{font-size:9px;margin-bottom:12px}.controls h2{font-family:Georgia,'Times New Roman',serif;font-weight:400;letter-spacing:-.02em;font-size:29px;line-height:1.1;margin-bottom:13px}.chapter-copy{font-size:13px;line-height:1.7;color:var(--muted);margin-bottom:24px}.control-group{margin:19px 0}.control-heading{display:flex;align-items:center;justify-content:space-between;font-size:12px;gap:10px;margin-bottom:9px}.control-heading output{font-size:11px;color:var(--muted);font-variant-numeric:tabular-nums}input[type=range]{accent-color:var(--teal);width:100%;height:16px;cursor:ew-resize;margin:0}.range-ends{display:flex;justify-content:space-between;color:var(--muted);font-size:10px;margin-top:5px}input[type=checkbox]{accent-color:var(--teal);cursor:pointer}.toggle-row{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:13px 0;border-top:1px solid var(--rule);font-size:12px}.toggle-row small{display:block;font-size:10px;color:var(--muted);margin-top:5px}.toggle-row input{width:30px;height:18px}.more-controls{border-top:1px solid 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var(--rule)}.posterior-heading{display:flex;flex-direction:column;gap:4px}.posterior-heading h3{font-size:12px;font-weight:400;margin:0}.posterior-heading>span{font-size:9px;color:var(--muted)}#posterior{display:block;width:100%;height:175px;margin:9px 0 6px}.inference-key{display:flex;gap:15px;font-size:10px;color:var(--muted)}.inference-key>span{display:flex;gap:5px;align-items:center}.line{width:17px;border-top:2px solid var(--coral)}.line.actual{border-color:var(--teal);border-top-style:dashed}.posterior-summary{font-size:11px;color:var(--muted);line-height:1.6;margin:10px 0}.small-check{font-size:10px;display:flex;gap:4px;align-items:center;color:var(--muted)}.status{font-size:12px;min-height:18px;color:var(--teal);margin:16px 0}.reading-notes{display:grid;grid-template-columns:repeat(3,1fr);gap:38px;border-top:1px solid var(--rule);padding:30px 0}.note-number{display:block;color:#789276;font-family:Georgia,serif;font-style:italic;font-size:18px;margin-bottom:12px}.reading-notes h2{font-family:Georgia,serif;font-size:21px;font-weight:400;letter-spacing:-.025em;margin-bottom:10px}.reading-notes p{font-size:12px;line-height:1.8;color:var(--muted);margin-bottom:0}.model-note{padding:19px 0;border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);font-size:12px}.model-note summary{color:var(--muted)}.model-note-body{max-width:780px;margin-top:18px;font-size:12px;line-height:1.8;color:var(--muted)}.model-note-body p:last-child{margin-bottom:0}footer{display:flex;justify-content:space-between;gap:20px;padding:24px 0 30px;font-size:10px;color:var(--muted)}[hidden]{display:none!important}
@media(min-width:1200px){.introduction{padding-top:50px;padding-bottom:40px}}
@media(max-width:900px){main{padding:0 25px}.laboratory{grid-template-columns:minmax(0,1fr) 260px;gap:23px}.introduction{gap:25px}.standfirst{font-size:14px}.transport{flex-wrap:wrap;gap:10px}.playback{margin-left:0}.transport output{margin-left:auto}.arena-key{gap:10px}.arena-key label{margin-left:0}.controls h2{font-size:25px}}
@media(max-width:700px){main{padding:0 20px}.masthead{font-size:10px;padding:20px 0}.edition{margin-left:8px}.introduction{display:block;padding:34px 0 26px}.introduction .eyebrow{font-size:9px}h1{font-size:43px;max-width:450px}.standfirst{font-size:14px;line-height:1.65;max-width:500px;margin-top:19px}.chapters{gap:3px;padding:15px 0 20px}.chapters button{padding:10px 9px;font-size:11px;flex:1}.chapters button span{display:block;margin:0 0 5px;font-size:10px}.laboratory{grid-template-columns:1fr;gap:28px}.controls{display:grid;grid-template-columns:1fr 1fr;gap:0 24px}.controls>.eyebrow,.controls>h2,.chapter-copy,#posterior-panel,.more-controls,.experiment-prompt{grid-column:1/-1}.controls h2{font-size:30px}.chapter-copy{max-width:500px;font-size:14px;margin-bottom:5px}.toggle-row{margin-top:0;align-items:start}.toggle-row input{flex-shrink:0}.control-group{margin:18px 0}.experiment-prompt{margin-top:7px}#posterior{height:220px}.reading-notes{grid-template-columns:1fr;gap:26px;padding:25px 0}.reading-notes article{display:grid;grid-template-columns:28px 1fr;gap:0 12px}.note-number{grid-row:1/3;margin:2px 0 0}.reading-notes p{grid-column:2}.reading-notes h2{margin-bottom:6px}.reading-notes p{font-size:13px}.transport{gap:8px}.transport button{padding:9px 12px}.arena-topline{left:12px;right:12px;top:12px;font-size:10px}.arena-hint{font-size:10px;bottom:12px}footer{flex-direction:column;gap:8px}.model-note-body{font-size:13px}}
@media(max-width:380px){main{padding:0 14px}h1{font-size:38px}.masthead>span{max-width:120px;text-align:right;line-height:1.6}.controls{gap:0 16px}.transport-actions{gap:4px}.transport button{padding:8px 10px}.playback{font-size:10px}.arena-key{font-size:10px}.arena-topline{font-size:9px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto}}
.motion-presets{display:flex;gap:8px;margin:14px 0}.motion-presets button{font-size:11px;padding:7px 12px}.motion-presets button[aria-pressed=true]{background:#e2e9dc;border-color:#aebfa6}
.arena-inference-key{display:flex;flex-wrap:wrap;align-items:center;gap:9px 18px;font-size:10px;color:var(--muted);padding:4px 0 9px}.arena-inference-key>span{display:flex;align-items:center;gap:6px}.arena-inference-key>span:last-child{font-size:10px}.arena-inference-key .line{border-color:#d77b5d}.arena-inference-key .line.pale{border-color:#7c9385;border-top-style:dashed}
.fan-swatch{display:inline-block;width:20px;height:12px;clip-path:polygon(0 50%,100% 0,100% 100%);background:linear-gradient(90deg,#eb987a30,#d77b5da0)}
/* Compact iframe presentation keeps every control available to the app. */
body.embed-mode .masthead,body.embed-mode .introduction,body.embed-mode .reading-notes,body.embed-mode .model-note,body.embed-mode footer{display:none}
body.embed-mode main{display:flow-root;max-width:1100px;padding:16px}
body.embed-mode .chapters{border-top:0;padding:0 0 18px}
body.embed-mode .status:empty{display:none}
body.embed-mode .status{margin-bottom:0}