:root{color-scheme:light;--page:#f6f4f8;--surface:#faf8fc;--panel:#fff;--chrome:#eee8f2;--ink:#302636;--muted:#766b80;--line:#e6dfeb;--purple:#a45aa8;--accent:#903da0;--purple-soft:#f1e4f5;--gold:#b37922;--gold-fill:#fff3d8;--blue:#8194ab;--peach:#eca896;--scene-bg:#fff;--shadow:0 12px 60px #3420390a}
:root[data-theme=dark]{color-scheme:dark;--page:#131117;--surface:#1b1720;--panel:#211b27;--chrome:#221b2a;--ink:#f2edf6;--muted:#b1a4bc;--line:#3c3147;--accent:#dfaaec;--purple-soft:#392841;--gold:#ffdb67;--gold-fill:#3c3222;--blue:#92a4b7;--scene-bg:#211c27;--shadow:0 12px 60px #0003}
*{box-sizing:border-box}body{margin:0;font:14px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;color:var(--ink);background:var(--page)}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer;color:inherit}a{color:inherit;text-decoration:none}button,select{border:1px solid var(--line);background:var(--panel)}button:disabled{opacity:.3;cursor:default}a:hover,button:hover{color:var(--accent)}:focus-visible{outline:2px solid var(--accent);outline-offset:3px}p,h1,h2{margin:0}[hidden]{display:none!important}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}.skip-link{position:absolute;top:-100px;z-index:50;padding:12px;background:var(--panel)}.skip-link:focus{top:0}
.explainer-header{height:54px;padding-inline:28px;display:flex;align-items:center;gap:24px;border-bottom:1px solid var(--line);background:var(--chrome)}.brand{display:flex;align-items:center;gap:10px}.brand b{font-size:18px;letter-spacing:-.5px}.brand>span:last-child{font-size:12px;color:var(--muted)}.header-divider{width:1px;height:18px;background:var(--line);margin-inline:6px}.logo-light{display:block}.logo-dark{display:none}[data-theme=dark] .logo-dark{display:block}[data-theme=dark] .logo-light{display:none}.explainer-header nav{margin-left:auto;font-size:12px}.theme-toggle{display:flex;align-items:center;gap:7px;padding:5px 11px;border-radius:22px;font-size:11px}.theme-toggle svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round}.moon{display:none}[data-theme=dark] .moon{display:block}[data-theme=dark] .sun{display:none}
main{height:calc(100dvh - 54px);padding:16px 24px}.workbench{max-width:1640px;height:100%;margin:auto;display:grid;grid-template-rows:54px 38px minmax(0,1fr) 76px;position:relative;border:1px solid var(--line);border-radius:18px;background:var(--panel);box-shadow:var(--shadow);overflow:hidden}.workbench:fullscreen{max-width:none;width:100vw;height:100dvh;border:0;border-radius:0}.chapter-tabs{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));border-bottom:1px solid var(--line);padding-inline:12px;background:var(--surface)}.chapter-tabs button{border:0;border-bottom:2px solid transparent;background:none;padding:0 7px;display:flex;align-items:center;gap:8px;color:var(--muted);font-size:11px;white-space:nowrap}.chapter-tabs button>span{font-size:9px;opacity:.65}.chapter-tabs button i{font-style:normal;margin-left:auto;opacity:.4}.chapter-tabs button:last-child i{display:none}.chapter-tabs button[aria-current=step]{color:var(--accent);border-color:var(--accent)}.chapter-tabs button.past{color:var(--ink)}.stage-topline{display:flex;align-items:center;justify-content:space-between;padding:0 22px;font-size:11px;color:var(--muted)}.small-tag{font-size:9px;letter-spacing:1px;border:1px solid var(--line);padding:2px 7px;border-radius:20px}.stage-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;min-height:0}.stage-canvas{display:grid;grid-template-rows:40px minmax(0,1fr) 36px 38px;min-width:0;min-height:0;padding:0 20px}.context-strip{width:100%;height:40px}.context-strip .svg-small{font-size:11px}#diagram-viewport{min-height:0;position:relative;display:flex;align-items:center;justify-content:center;isolation:isolate}#detail-visual{width:100%;height:100%;overflow:visible;font-family:Arial,sans-serif}.inspector{border-left:1px solid var(--line);padding:18px 22px;overflow-y:auto;scrollbar-width:thin;display:flex;flex-direction:column;gap:16px;background:var(--surface)}.eyebrow{font-size:9px;letter-spacing:1.7px;color:var(--accent);font-weight:600}h1{font-size:clamp(21px,1.75vw,28px);line-height:1.25;letter-spacing:-.8px;font-weight:550;margin:10px 0 14px}.inspector-copy>p:last-child{font-size:12px;color:var(--muted);line-height:1.8}.formula{border-left:2px solid var(--purple);background:var(--purple-soft);padding:10px 12px;font:11px/1.8 "SFMono-Regular",Consolas,monospace;overflow-wrap:anywhere;color:var(--accent)}.stage-options{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:11px}.stage-options label{display:flex;align-items:center;gap:9px;color:var(--muted)}.stage-options select{padding:4px 8px;border-radius:8px}.stage-options button,.quiet-button{font-size:11px;padding:5px 9px;border-radius:18px}.quiet-button{border:0;background:transparent;color:var(--muted)}.stage-options .lifting-control{width:100%;flex-direction:column;align-items:stretch}.lifting-control span{display:flex;justify-content:space-between}.stage-options details p{font-size:11px;color:var(--muted)}.segmented{display:inline-flex;padding:3px;border:1px solid var(--line);border-radius:25px;background:var(--panel)}.segmented button{font-size:10px;border:0;border-radius:20px;padding:4px 10px;background:none;color:var(--muted)}.segmented button[aria-pressed=true]{background:var(--purple-soft);color:var(--accent)}#experiment-controls{display:flex;flex-direction:column;gap:14px}.source-control{display:flex;justify-content:space-between;align-items:center;font-size:11px;color:var(--muted)}.strength-control{display:flex;flex-direction:column;gap:7px}.strength-control>span{display:flex;justify-content:space-between;font-size:11px;color:var(--muted)}input[type=range]{width:100%;accent-color:var(--purple);height:15px;margin:0;cursor:pointer}output{font-variant-numeric:tabular-nums;color:var(--accent)}.selection-readout{display:flex;justify-content:center;gap:20px;align-items:center;font-size:11px;color:var(--muted)}.selection-readout b{font-size:18px;font-weight:500;color:var(--gold);margin-left:8px}.selection-readout>span:last-child b{color:var(--accent)}.technical-note{border-top:1px solid var(--line);padding-top:8px;margin-top:auto}summary{cursor:pointer;font-size:11px;color:var(--muted);list-style:none}summary::-webkit-details-marker{display:none}summary span{float:right}.technical-note p{font-size:11px;color:var(--muted);line-height:1.7;margin-top:10px}#supervision-toggle{text-align:left;padding:0;color:var(--accent)}
.candidate-controls{display:flex;align-items:center;justify-content:center;gap:8px}.candidate-controls>span{font-size:10px;color:var(--muted);margin-right:8px}.candidate-controls button{font-size:11px;min-width:29px;height:28px;border-radius:20px;padding:0 9px;transition:background .2s,border-color .2s}.candidate-controls button[aria-pressed=true]{background:var(--purple-soft);border-color:var(--purple);color:var(--accent)}.visual-caption{max-width:770px;justify-self:center;text-align:center;font-size:10px;line-height:1.6;color:var(--muted);padding-top:6px}.playback{display:flex;align-items:center;gap:10px;border-top:1px solid var(--line);padding:10px 22px;background:var(--surface)}.play-button{border:0;border-radius:24px;background:var(--purple-soft);color:var(--accent);font-size:12px;min-width:108px;padding:10px 13px;display:flex;align-items:center;justify-content:center;gap:10px}#play-symbol{font-size:10px;width:12px}.icon-button{width:32px;height:32px;border-radius:50%;font-size:16px}.timeline{flex:1;min-width:80px;margin-inline:14px}.timeline-meta{display:flex;justify-content:space-between;gap:12px;font-size:10px;color:var(--muted);margin-bottom:3px}.timeline-meta output{font-size:10px;color:var(--muted)}.speed-label select{font-size:11px;border-radius:8px;padding:5px}.playback .quiet-button{padding-inline:6px}dialog{max-width:590px;width:calc(100% - 40px);border:1px solid var(--line);border-radius:20px;padding:32px;background:var(--panel);color:var(--ink);box-shadow:var(--shadow)}dialog::backdrop{background:#15101ccc;backdrop-filter:blur(7px)}dialog h2{font-size:25px;line-height:1.3;letter-spacing:-.5px;margin:15px 0}dialog p{font-size:13px;color:var(--muted)}dialog .formula{margin-block:18px}.dialog-close{position:absolute;right:14px;top:10px;border:0;background:none;font-size:24px}.training-flow{display:flex;align-items:center;gap:12px;margin:24px 0;font-size:11px}.training-flow span{border:1px solid var(--line);padding:10px;border-radius:10px}.training-flow i{font-style:normal;color:var(--accent)}.dialog-note{font-size:11px}
.svg-label{fill:var(--ink);font-size:12px;font-weight:500}.svg-small{fill:var(--muted);font-size:10px}.svg-tiny{fill:var(--muted);font-size:9px}.svg-mono{fill:var(--muted);font:10px Consolas,monospace}.svg-title{fill:var(--ink);font-size:16px;font-weight:500}.svg-accent{fill:var(--accent)}.svg-gold{fill:var(--gold)}.svg-hero{fill:var(--ink);font-size:22px;letter-spacing:-.5px}.detail-line{fill:none;stroke:var(--line)}.trace-line{fill:none;stroke:var(--purple);stroke-width:2;stroke-linecap:round}.attention-edge{fill:none;stroke:var(--purple)}.candidate-mark{cursor:pointer}.candidate-mark:hover .candidate-hit,.candidate-mark:focus-visible .candidate-hit{stroke:var(--accent);stroke-width:1.5}.candidate-mark:focus-visible{outline:none}.matrix-cell{cursor:crosshair}.matrix-cell:hover rect{stroke:var(--gold);stroke-width:2;opacity:1}.phase-group{transition:opacity .35s}.trace-badge{fill:var(--purple-soft);stroke:var(--purple)}#matrix-tooltip{position:absolute;bottom:10px;left:50%;transform:translateX(-50%);border:1px solid var(--line);background:var(--panel);padding:7px 13px;border-radius:9px;color:var(--ink);font:11px/1.5 Arial,sans-serif;box-shadow:var(--shadow);pointer-events:none;white-space:nowrap}.stage-enter{animation:stage-enter .45s ease both}@keyframes stage-enter{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.running .attention-edge{stroke-dasharray:5 7;animation:flow 1.5s linear infinite}@keyframes flow{to{stroke-dashoffset:-48}}.record-chip{fill:var(--gold-fill);stroke:var(--gold)}.phase-status{font-size:10px;color:var(--accent)}
@media(min-width:1550px){.stage-layout{grid-template-columns:minmax(0,1fr) 340px}.inspector{padding:25px 28px;gap:20px}}
@media(max-height:800px) and (min-width:901px){main{padding:10px 18px}.workbench{grid-template-rows:46px 32px minmax(0,1fr) 65px}.stage-canvas{grid-template-rows:32px minmax(0,1fr) 32px 34px}.context-strip{height:32px}.inspector{padding:12px 17px;gap:11px}h1{font-size:22px;margin:8px 0 10px}.inspector-copy>p:last-child{line-height:1.65;font-size:11px}.formula{padding:7px 10px;font-size:10px}.stage-options{gap:6px}#experiment-controls{gap:9px}.playback{padding:9px 18px}}
@media(max-width:1100px){.stage-layout{grid-template-columns:minmax(0,1fr) 260px}.chapter-tabs button{font-size:10px;gap:4px}.chapter-tabs button>span{display:none}.stage-canvas{padding-inline:12px}.inspector{padding-inline:15px}.stage-topline{padding-inline:16px}.chapter-tabs{padding-inline:8px}}
@media(max-width:900px){.explainer-header{padding-inline:16px}.brand>span:last-child{font-size:10px}.brand b{font-size:16px}.explainer-header nav{display:none}.theme-toggle{margin-left:auto}main{height:auto;min-height:calc(100dvh - 54px);padding:12px}.workbench{height:auto;grid-template-rows:48px 38px auto 70px;overflow:clip}.chapter-tabs{overflow-x:auto;display:flex}.chapter-tabs button{min-width:max-content;padding-inline:12px;gap:8px;font-size:11px}.chapter-tabs button i{display:none}.stage-layout{display:flex;flex-direction:column}.stage-canvas{height:430px;padding:0 9px;grid-template-rows:32px minmax(0,1fr) 36px 44px}.inspector{border-left:0;border-top:1px solid var(--line);padding:20px;overflow:visible;gap:14px}.inspector h1{font-size:25px}.technical-note{margin-top:0}.stage-topline{font-size:10px;gap:8px}.small-tag{font-size:8px;letter-spacing:.5px}.playback{padding-inline:12px;gap:6px;position:sticky;bottom:0;z-index:5}.playback .quiet-button,.playback #fullscreen{display:none}.timeline{margin-inline:4px}.timeline-meta #timeline-label{display:none}.timeline-meta{justify-content:flex-end}.play-button{min-width:82px;padding:9px;font-size:10px}.icon-button{width:26px;height:26px}.visual-caption{font-size:9px}.workbench:fullscreen .stage-layout{overflow-y:auto}.workbench:fullscreen{grid-template-rows:48px 38px minmax(0,1fr) 70px}.source-control{justify-content:flex-start;gap:16px}}
input[type=range]{appearance:none;-webkit-appearance:none;background:transparent;height:16px}input[type=range]::-webkit-slider-runnable-track{height:3px;border-radius:4px;background:linear-gradient(to right,var(--purple) var(--fill,0%),var(--line) var(--fill,0%))}input[type=range]::-webkit-slider-thumb{appearance:none;-webkit-appearance:none;width:11px;height:11px;margin-top:-4px;border:2px solid var(--panel);border-radius:50%;background:var(--accent);box-shadow:0 0 0 1px var(--purple)}input[type=range]::-moz-range-track{height:3px;border-radius:4px;background:var(--line)}input[type=range]::-moz-range-progress{height:3px;background:var(--purple)}input[type=range]::-moz-range-thumb{width:9px;height:9px;border:2px solid var(--panel);border-radius:50%;background:var(--accent)}.record-hit{cursor:pointer}.record-hit:hover,.record-hit:focus-visible{stroke:var(--accent);stroke-width:1.5;outline:none}
@media(max-width:900px){.context-strip{display:block;height:0;visibility:hidden}.stage-canvas{grid-template-rows:0 minmax(0,1fr) 36px 44px}.stage-canvas #detail-visual{overflow:hidden}#diagram-viewport:not(.recorded){overflow-x:auto;justify-content:flex-start}#diagram-viewport:not(.recorded) #detail-visual{min-width:680px;flex-shrink:0}}
.compare-button{width:100%;border:1px solid var(--purple)!important;color:var(--accent);background:var(--purple-soft);touch-action:none;user-select:none}.compare-button[aria-pressed=true]{background:var(--gold-fill);border-color:var(--gold)!important;color:var(--gold)}.timeline{position:relative}.timeline-markers{height:8px;position:relative;margin-inline:5px}.timeline-markers button{position:absolute;transform:translateX(-50%);top:0;width:7px;height:7px;border:0;border-radius:50%;background:var(--purple);padding:0;opacity:.65}.timeline-markers button:hover,.timeline-markers button:focus-visible{opacity:1;background:var(--gold);outline-offset:2px}.trace-muted{opacity:.20!important}.boundary-muted{opacity:.30}.trace-focused>circle{stroke:var(--accent);stroke-width:1.5}[data-lift-step]{cursor:pointer;outline:none}[data-lift-step]:hover rect,[data-lift-step]:focus-visible rect{stroke:var(--accent);stroke-width:1.5}.timeline-meta{margin-bottom:0}.stage-options .compare-button{font-size:10px;padding-block:6px}
[data-evidence-step]{cursor:pointer;outline:none}[data-evidence-step]:hover rect,[data-evidence-step]:focus-visible rect{stroke:var(--accent);stroke-width:1.5}html[data-stage="1"] .strength-control,html[data-stage="1"] .selection-readout{display:none}
[data-problem-step]{cursor:pointer;outline:none}[data-problem-step]:hover rect,[data-problem-step]:focus-visible rect{stroke:var(--accent);stroke-width:1.5}
#pair-orbit-hit{cursor:grab;touch-action:none;outline:none}#pair-orbit-hit:active{cursor:grabbing}#pair-orbit-hit:focus-visible{stroke:var(--purple);stroke-dasharray:3 5}#pair-clock{font-variant-numeric:tabular-nums}
.validation-media{width:100%;height:100%;display:flex;align-items:center;justify-content:center;overflow:hidden;border-radius:5px;background:var(--panel)}.validation-media video{width:100%;height:100%;object-fit:contain;display:block}.validation-hit{cursor:pointer;outline:none}.validation-hit:hover,.validation-hit:focus-visible{stroke:var(--accent);stroke-width:1.5}#validation-dialog{max-width:1100px;width:calc(100% - 44px);padding:26px}#validation-full-video{width:100%;max-height:66dvh;display:block;border-radius:10px;background:var(--panel);margin-block:16px}#validation-video-detail{font-size:12px}#validation-video-link{display:inline-block;margin-top:12px;font-size:12px;color:var(--accent)}
[data-relation-step]{cursor:pointer;outline:none}[data-relation-step]:hover rect,[data-relation-step]:focus-visible rect{stroke:var(--accent);stroke-width:1.5}
/* Clearer navigation, less peripheral chrome; scientific detail remains in the inspector. */
.stage-topline,.context-strip,.visual-caption{display:none!important}.workbench{grid-template-rows:68px minmax(0,1fr) 76px}.chapter-tabs{grid-row:1;padding-inline:12px;gap:4px}.stage-layout{grid-row:2}.playback{grid-row:3}.stage-canvas{grid-template-rows:minmax(0,1fr) 40px;padding-top:12px}#diagram-viewport{grid-row:1}.candidate-controls{grid-row:2}html[data-stage="0"] .stage-canvas{grid-template-rows:minmax(0,1fr)}html[data-stage="0"] .candidate-controls{display:none}.chapter-tabs button{font-size:14px;font-weight:600;gap:7px;color:var(--ink);padding-inline:9px;border-radius:10px 10px 0 0}.chapter-tabs button>span{display:inline;font-size:11px;opacity:.9;color:var(--accent)}.chapter-tabs button i{font-size:13px;opacity:.55}.chapter-tabs button[aria-current=step]{background:var(--purple-soft);border-bottom-width:3px}.play-button{background:linear-gradient(110deg,#A45AA8 5%,#ECA896 54%,#FFDB67 100%);color:#39233D;font-weight:650;box-shadow:0 3px 14px #a45aa826}.play-button:hover{color:#39233D;filter:brightness(1.06)}
@media(max-width:1200px) and (min-width:901px){.chapter-tabs button{font-size:12px;padding-inline:5px;gap:5px}.chapter-tabs button i{display:none}}
@media(max-width:900px){.workbench{grid-template-rows:62px auto 70px}.workbench:fullscreen{grid-template-rows:62px minmax(0,1fr) 70px}.chapter-tabs button{font-size:14px;padding-inline:14px;gap:8px}.chapter-tabs button>span{display:inline}.stage-canvas{grid-template-rows:minmax(0,1fr) 40px}.play-button{font-size:12px}.workbench:fullscreen .stage-layout{grid-row:2}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important}}
/* The model locator occupies the existing canvas, never another page section. */
.model-map-toggle{display:flex;align-items:center;justify-content:space-between;width:100%;border:1px solid var(--line);border-radius:9px;padding:8px 10px;background:var(--panel);color:var(--accent);font-size:11px;text-align:left}
.model-map-toggle[aria-expanded=true]{border-color:var(--purple);background:var(--purple-soft)}
#model-map{position:absolute;inset:0;z-index:3;display:grid;grid-template-rows:auto auto minmax(0,1fr);background:var(--panel);padding:5px 7px 8px;animation:map-enter .4s ease both}
.model-map-toolbar{display:flex;justify-content:space-between;align-items:center;gap:8px;padding:0 8px 12px}.model-map-tabs{display:flex;gap:3px;padding:3px;border:1px solid var(--line);border-radius:20px;background:var(--surface)}.model-map-tabs button{border:0;background:none;border-radius:16px;font-size:11px;padding:5px 10px;color:var(--muted)}.model-map-tabs button[aria-pressed=true]{background:var(--purple-soft);color:var(--accent)}#model-map-close{border:0;background:none;font-size:11px;color:var(--muted);white-space:nowrap}
.model-map-heading{padding:0 13px 5px}.model-map-heading h2{font-size:19px;line-height:1.3;font-weight:550;letter-spacing:-.4px}.model-map-heading p{font-size:11px;line-height:1.5;color:var(--muted);margin-top:5px}.model-map-canvas{min-height:0;display:flex;align-items:center;justify-content:center;overflow:auto}.model-map-canvas svg{display:block;width:100%;height:100%;font-family:Arial,sans-serif;max-height:480px}
.map-node rect{fill:var(--surface);stroke:var(--line);stroke-width:1.2}.map-predictor>rect{fill:var(--surface);stroke:var(--blue);stroke-opacity:.6;stroke-width:1.2}.map-node.map-active rect{fill:var(--purple-soft);stroke:var(--purple);stroke-width:1.5;fill-opacity:var(--map-light,1)}.map-label{font-size:12px;fill:var(--ink);font-weight:500}.map-small{font-size:10px;fill:var(--muted)}.map-takeaway{font-size:12px;fill:var(--accent)}.map-wire{fill:none;stroke:var(--muted);stroke-width:1.1;stroke-opacity:.5}.map-complementary{stroke-dasharray:4 4}.map-flow{fill:none;stroke:var(--purple);stroke-width:2;stroke-linecap:round}.map-packet{fill:var(--gold)}
.model-map-tabs{max-width:100%;overflow-x:auto}.model-map-tabs button{flex-shrink:0}
.model-map-open>#detail-visual{visibility:hidden}
[data-map-node=projection] text{font-size:10px}
#diagram-viewport.model-map-open>#detail-visual{opacity:0;pointer-events:none;transform:scale(.96);min-width:0!important}#detail-visual{transition:opacity .3s ease,transform .4s ease}.model-map-open~.candidate-controls{visibility:hidden}
@keyframes map-enter{from{opacity:0;transform:scale(.97)}to{opacity:1;transform:scale(1)}}
@media(max-width:1100px){.model-map-tabs button{font-size:10px;padding:5px 7px}.model-map-heading h2{font-size:17px}}
@media(max-width:900px){#model-map{padding:5px 0}.model-map-toolbar{flex-wrap:wrap;padding-bottom:8px}.model-map-heading{padding-inline:8px}.model-map-canvas{justify-content:flex-start}.model-map-canvas svg{min-width:690px;flex-shrink:0}.model-map-heading p{font-size:11px}.model-map-heading h2{font-size:17px}.model-map-tabs button{font-size:10px}}
/* Softer inspector hierarchy and bright, theme-aware measured-pair beacons. */
:root{--pair-a:#FFDB67;--pair-b:#82BDFF;--pair-a-label:#916900;--pair-b-label:#286BBE;--caption-gold:#916900}
:root[data-theme=dark]{--pair-a-label:#FFDB67;--pair-b-label:#82BDFF;--caption-gold:#FFDB67}
.inspector #detail-title{font-size:clamp(17px,1.3vw,21px);line-height:1.3;letter-spacing:-.5px}
.narration-caption #narration-subtitle{font-size:19px;color:var(--caption-gold);line-height:1.5}
@media(max-height:800px) and (min-width:901px){.inspector #detail-title{font-size:17px}}
@media(max-width:1100px) and (min-width:901px){.narration-caption #narration-subtitle{font-size:18px}}
@media(max-width:900px){.inspector #detail-title{font-size:20px}.narration-caption #narration-subtitle{font-size:17px}}
/* Readable navigation without competing sidebar micro-headings. */
.inspector-copy #detail-description,.technical-note p{text-align:justify;text-align-last:left;hyphens:auto}
.chapter-tabs button{display:grid;grid-template-columns:auto minmax(0,1fr) 12px;column-gap:8px;font-size:16px;white-space:normal;text-align:left;line-height:1.25}
.chapter-tabs .chapter-label{font:inherit;font-weight:600;min-width:0}
.chapter-tabs button>span{font-size:12px;align-self:center}
.chapter-tabs button i{font-size:16px;line-height:1;margin:0;justify-self:center;align-self:center}
.chapter-tabs button:last-child{grid-template-columns:auto minmax(0,1fr)}
.explainer-header nav,.explainer-header .theme-toggle{font-size:14px}
.playback .play-button,.playback .narration-button,.playback .quiet-button,.playback .speed-label select{font-size:14px}
.playback #timeline-label{display:none}
.playback .timeline-meta{justify-content:flex-end}
@media(min-width:901px) and (max-width:1200px){.chapter-tabs button{font-size:15px;column-gap:6px;padding-inline:5px}.chapter-tabs button i{display:block;font-size:14px}}
@media(max-width:900px){.chapter-tabs button{display:flex;min-width:max-content;font-size:16px;gap:10px}.chapter-tabs button i{display:block}.chapter-tabs button:last-child i{display:none}.playback .play-button,.playback .narration-button,.playback .speed-label select{font-size:13px}}
/* Shallow material depth supports the computation; labels stay front-facing. */
:root{--depth-top:#fff;--depth-side:#e4dce9;--depth-edge:#fff;--bead-light:#fff8fd}
:root[data-theme=dark]{--depth-top:#302737;--depth-side:#151019;--depth-edge:#57435f;--bead-light:#fff1fc}
.matrix-value{fill:var(--ink)}
[data-computation-zone]{will-change:opacity}
[data-latent]{cursor:pointer}
[data-latent]:focus-visible{outline:none}
[data-latent]:focus-visible [data-lift-point]{stroke:var(--gold);stroke-width:2}
/* Recorded media remains front-facing; only its framing shares the depth language. */
[data-validation-edge]{opacity:calc(.12 + var(--arrival-strength,0)*.65);pointer-events:none}
[data-validation-card]:hover [data-validation-edge],[data-validation-card]:focus-within [data-validation-edge]{opacity:.9;stroke:var(--accent)}
#pair-execution,#pair-geometry{will-change:opacity}
/* Narrated mode shares the workbench, but has its own audio-led controls. */
.narration-button,.narration-mute{display:flex;align-items:center;justify-content:center;gap:8px;flex-shrink:0;border-radius:24px;padding:9px 13px;font-size:12px;white-space:nowrap}.narration-button{background:#82478f;color:#fff;border-color:#a45aa8;box-shadow:0 3px 14px #a45aa81a;min-width:143px}.narration-button:hover{background:#9454a0;color:#fff}.narration-button[aria-pressed=true]{box-shadow:0 0 0 2px var(--panel),0 0 0 3px var(--purple)}.narration-button svg,.narration-mute svg{width:17px;height:17px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}.narration-mute{background:var(--purple-soft);color:var(--accent);padding-inline:10px;font-size:11px}.narration-mute[aria-pressed=true] svg{opacity:.4}.narration-caption{flex:1;min-width:0;text-align:center;max-width:1060px;margin:auto}.narration-caption p{font:16px/1.5 Arial,sans-serif;color:var(--ink);text-wrap:pretty}.narration-caption #narration-status{font-size:11px;line-height:1.3;color:var(--accent)}.narration-caption #narration-status:empty{display:none}.narration-exit{border:0;background:none;font-size:22px;color:var(--muted);padding:4px 8px}.narrating .explainer-header{height:104px;gap:16px}.narrating .brand .header-divider,.narrating .brand>span:last-child{display:none}.narrating main{height:calc(100dvh - 104px)}.narrating .timeline-markers{visibility:hidden}.narrating .explainer-header nav{margin-left:0;white-space:nowrap}.narrating .playback{gap:8px}.narrating .timeline{margin-inline:6px}
@media(max-width:1100px) and (min-width:901px){.narration-caption p{font-size:15px}.narration-mute span{display:none}.narration-button{min-width:130px;padding-inline:10px}}
@media(max-width:900px){.narrating .explainer-header{height:auto;min-height:112px;display:grid;grid-template-columns:1fr auto auto;padding:10px 16px;gap:6px 10px}.narrating .narration-caption{grid-row:2;grid-column:1/-1;min-height:66px;padding:5px 0}.narrating .narration-caption p{font-size:14px;line-height:1.45}.narrating .narration-exit{grid-column:2;grid-row:1}.narrating .theme-toggle{grid-column:3;grid-row:1}.narrating main{height:auto;min-height:0}.playback{flex-wrap:wrap;min-height:110px;align-content:center;gap:8px}.workbench{grid-template-rows:62px auto 110px}.workbench:fullscreen{grid-template-rows:62px minmax(0,1fr) 110px}.narration-button{font-size:11px;padding:8px 11px;min-width:129px}.playback .timeline{order:10;flex-basis:100%;margin-inline:2px}.narration-mute{padding:7px}.narration-mute span{display:none}.narrating .playback #previous,.narrating .playback #next{display:none}.narrating .narration-button{min-width:141px}.playback .timeline-meta{display:none}}