/* Uraniborg public edition. One type scale: nothing outside the 3D graphic is below 13px. */
:root{
  --bg:#070e0d;--bg2:#0b1513;--surface:#0f1b18;--surface2:#142420;--line:rgba(196,220,204,.16);--line2:rgba(196,220,204,.28);
  --ink:#f0ede3;--ink2:#d6dcd3;--muted:#aebcb3;--faint:#93a69a;
  --mint:#b8dec9;--gold:#f0cf8b;--coral:#f4a58f;--violet:#c6bcea;
  --serif:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,serif;
  --sans:"Avenir Next",Avenir,"Segoe UI",system-ui,sans-serif;
  --mono:"SFMono-Regular",ui-monospace,Menlo,Consolas,monospace;
  --fs-xs:13px;--fs-s:14px;--fs-m:16px;--gap:118px;--pad:clamp(16px,3.6vw,56px);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:400 var(--fs-m)/1.55 var(--sans);-webkit-font-smoothing:antialiased;overflow-x:hidden}
body.reduced *{animation:none!important;transition:none!important}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}html{scroll-behavior:auto}}
h1,h2,h3,p{margin:0}
button,input,select{font:inherit;color:inherit}
button{cursor:pointer;background:transparent;border:1px solid var(--line2);border-radius:6px;padding:10px 16px;font-size:var(--fs-s);color:var(--ink2)}
button:hover:not(:disabled){border-color:var(--mint);color:#fff}
button:disabled{opacity:.45;cursor:not-allowed}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px}
a{color:var(--gold)}
[hidden]{display:none!important}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:16px;top:-80px;background:var(--ink);color:var(--bg);padding:10px 14px;z-index:99}.skip:focus{top:12px}
.eyebrow{font:500 var(--fs-xs)/1.4 var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--muted);display:flex;align-items:center;gap:12px}
.rule{display:inline-block;width:34px;height:1px;background:var(--gold)}
.ghost{border-color:transparent}
#guide-open .gq{display:none}
.note{font-size:var(--fs-xs);color:var(--muted);line-height:1.5}

/* top bar */
.topbar{display:grid;grid-template-columns:auto auto 1fr auto;align-items:center;gap:24px;padding:14px var(--pad);border-bottom:1px solid var(--line);background:linear-gradient(#0a1412,#08110f)}
.brand{display:flex;align-items:center;gap:14px;text-decoration:none;color:var(--ink)}
.return{display:inline-flex;align-items:center;min-height:44px;padding:0 14px;border:1px solid var(--line);border-radius:999px;color:var(--ink);text-decoration:none;font:var(--fs-xs)/1 var(--mono);letter-spacing:.08em;white-space:nowrap}.return:hover,.return:focus-visible{border-color:currentColor;outline:2px solid currentColor;outline-offset:2px}
.brand b{display:block;font:500 20px/1.1 var(--serif);letter-spacing:.32em}
.brand small{display:block;font:var(--fs-xs)/1.4 var(--mono);color:var(--muted);letter-spacing:.06em;margin-top:4px}
.modes{display:flex;justify-content:center;gap:6px}
.modes button{display:flex;flex-direction:column;align-items:flex-start;gap:1px;padding:8px 16px;border-color:transparent;min-width:168px;text-align:left}
.modes button b{font-weight:600;font-size:var(--fs-s);color:var(--ink);display:flex;align-items:center;gap:7px}
.modes button small{font-size:var(--fs-xs);color:var(--muted)}
.modes button[aria-pressed=true]{border-color:var(--line2);background:var(--surface)}
.modes .dot{width:7px;height:7px;border-radius:50%;border:1px solid var(--muted);display:inline-block}

.disclosure{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;padding:11px var(--pad);border-bottom:1px solid var(--line);background:var(--bg2);font-size:var(--fs-s);color:var(--muted)}
.disclosure strong{color:var(--ink);font-weight:600;margin-right:6px}
.control-line{color:var(--ink2)}
.control-line::before{content:"◆";color:var(--gold);font-size:10px;margin-right:9px;vertical-align:2px}

/* stage */
.stage{position:relative;display:grid;grid-template-columns:minmax(340px,440px) minmax(0,1fr);gap:clamp(28px,4vw,64px);padding:40px var(--pad) 36px;overflow:hidden;
  background:radial-gradient(ellipse 60% 70% at 68% 40%,rgba(58,96,74,.20),transparent 70%),radial-gradient(ellipse 30% 40% at 90% 10%,rgba(240,207,139,.05),transparent 70%)}
#stars{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}
.narrative,.viz,.mode-panel{position:relative}
.narrative{display:flex;flex-direction:column;gap:20px;min-width:0}
h1{font:400 clamp(34px,3.3vw,52px)/1.08 var(--serif);letter-spacing:-.01em;color:var(--ink);text-wrap:balance}
.lead{font-size:clamp(16px,1.2vw,18px);color:var(--ink2);line-height:1.6;max-width:36em}
.actions{display:flex;gap:10px;flex-wrap:wrap}
.primary{background:var(--mint);color:#0b1714;border-color:var(--mint);font-weight:600;display:inline-flex;align-items:center;gap:10px;padding:12px 20px}
.primary:hover:not(:disabled){background:#d2eddf;color:#07110f}
.primary small{font:var(--fs-xs) var(--mono);border-left:1px solid rgba(11,23,20,.35);padding-left:10px}
.card{border:1px solid var(--line2);border-radius:10px;background:rgba(12,22,19,.92);padding:20px 22px;display:flex;flex-direction:column;gap:10px;backdrop-filter:blur(3px)}
.card[data-tone=old]{border-color:rgba(240,207,139,.55);box-shadow:0 0 40px rgba(240,207,139,.07)}
.card[data-tone=finding]{border-color:rgba(244,165,143,.5)}
.card[data-tone=clean]{border-color:rgba(184,222,201,.5)}
.card[data-tone=abstain]{border-color:rgba(198,188,234,.5)}
.card-top{display:flex;justify-content:space-between;font:var(--fs-xs)/1.4 var(--mono);letter-spacing:.12em;color:var(--gold)}
#card-mark{font-size:18px;line-height:1}
.card h2{font:400 24px/1.2 var(--serif)}
.card p{color:var(--ink2);font-size:var(--fs-s)}
.answers{list-style:none;margin:4px 0 0;padding:0;display:grid;gap:8px}
.answer{width:100%;display:grid;grid-template-columns:1fr auto;gap:2px 12px;text-align:left;padding:10px 12px 10px 14px;border-left:3px solid var(--line2);background:var(--surface)}
.answer .label{grid-column:1/-1;color:var(--ink2);font-size:var(--fs-s)}
.answer b{font-size:var(--fs-s)}
.answer small{font:var(--fs-xs) var(--mono);color:var(--muted);align-self:end}
.answer[aria-current=true]{background:var(--surface2);border-color:var(--line2)}
[data-tone=finding].answer{border-left-color:var(--coral)}[data-tone=finding].answer b{color:var(--coral)}
[data-tone=clean].answer{border-left-color:var(--mint)}[data-tone=clean].answer b{color:var(--mint)}
[data-tone=abstain].answer{border-left-color:var(--violet)}[data-tone=abstain].answer b{color:var(--violet)}
.chain-status{display:grid;gap:4px;border-top:1px solid var(--line);padding-top:12px;font-size:var(--fs-s)}
.chain-status .cs-k,.chain-status .cs-k2{font:var(--fs-xs) var(--mono);color:var(--muted);letter-spacing:.04em}
.chain-status .cs-k2{color:var(--gold)}
.chain-status .explorer{margin-top:8px;font:italic 17px/1.35 var(--serif);color:var(--ink)}

/* viz */
.viz{display:flex;flex-direction:column;gap:14px;min-width:0}
.viz-top{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap}
.tabs{display:flex;border:1px solid var(--line2);border-radius:8px;padding:3px}
.tabs button{border:0;padding:8px 14px;border-radius:5px;color:var(--muted)}
.tabs button[aria-selected=true]{background:var(--surface2);color:var(--ink)}
.viz-case{font:var(--fs-xs)/1.4 var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--gold)}

.stack-view{position:relative;padding-bottom:26px}
.gap-note{display:none;font-size:var(--fs-xs);color:var(--violet);margin:0 0 10px}
.stack{--cols:1fr 1fr var(--gap) 1fr;display:grid;grid-template-columns:minmax(128px,170px) var(--cols);gap:6px 10px;align-items:stretch}
.filament{position:absolute;inset:0;z-index:0;width:100%;height:100%;pointer-events:none;overflow:visible;transition:opacity .6s}
.corner{align-self:end;font:600 var(--fs-xs)/1 var(--mono);letter-spacing:.2em;color:var(--gold);padding-bottom:12px}
.ep-head{display:flex;flex-direction:column;align-items:center;text-align:center;gap:2px;padding:6px 4px 12px}
.ep-head b{font:500 var(--fs-s)/1.3 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--gold)}
.ep-head .who{font-size:var(--fs-s);color:var(--ink)}
.ep-abbr{display:none}
.ep-head .when{font-size:var(--fs-xs);color:var(--muted)}
.star{position:relative;width:12px;height:12px;border-radius:50%;background:var(--gold);box-shadow:0 0 14px 4px rgba(240,207,139,.45),0 0 44px 10px rgba(240,207,139,.12);margin:8px 0 12px}
.star::before,.star::after{content:"";position:absolute;left:50%;top:50%;background:rgba(240,207,139,.7);transform:translate(-50%,-50%)}
.star::before{width:34px;height:1px}.star::after{width:1px;height:34px}
.gap-head{display:flex;flex-direction:column;justify-content:flex-end;align-items:center;gap:6px;padding-bottom:12px}
.badge{font:600 var(--fs-xs)/1.25 var(--sans);text-align:center;border-radius:5px;padding:4px 6px;border:1px solid}
.badge.changed{color:var(--violet);border-color:rgba(198,188,234,.5);background:rgba(198,188,234,.08);transition:opacity .5s}
.badge.handoff{color:var(--mint);border-color:rgba(184,222,201,.45);background:rgba(184,222,201,.06)}
.gap-cell{position:relative}
.gap-cell::before{content:"";position:absolute;left:50%;top:-6px;bottom:-6px;border-left:1px dashed rgba(198,188,234,.55);transition:opacity .5s}
.gap-cell.first::before{top:0}.gap-cell.last::before{bottom:0}
.layer-name{display:flex;align-items:center;justify-content:flex-end;text-align:right;font-size:var(--fs-s);color:var(--ink2);padding-right:4px;transition:opacity .6s;transition-delay:calc(var(--l,0)*45ms)}
.cell{position:relative;z-index:1;display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:7px;border:1px solid rgba(184,222,201,.26);background:#0f1d19;font-size:var(--fs-s);line-height:1.3;color:var(--ink2);transition:opacity .6s,border-color .5s,background .5s,color .5s,box-shadow .5s;transition-delay:calc(var(--l,0)*45ms)}
.cell::before{content:"";flex:none;width:6px;height:6px;border-radius:50%;background:var(--mint);margin-right:10px;opacity:.85}
.cell .short{display:none}
.cell[data-state=unavailable]{border-style:dashed;border-color:rgba(174,188,179,.4);background:#0a1412;color:var(--muted)}
.cell[data-state=unavailable]::before{background:transparent;border:1px dotted var(--muted)}
.legend{display:flex;flex-wrap:wrap;gap:8px 20px;font-size:var(--fs-xs);color:var(--muted);padding-top:6px;border-top:1px solid var(--line)}
.legend span{display:inline-flex;align-items:center;gap:8px}
.k{display:inline-block;width:18px;height:10px;border-radius:3px;border:1px solid}
.k.ok{border-color:rgba(184,222,201,.5);background:rgba(184,222,201,.1)}
.k.changed{border-color:var(--violet);background:rgba(198,188,234,.12)}
.k.old{border-color:var(--gold);background:rgba(240,207,139,.18);box-shadow:0 0 8px rgba(240,207,139,.4)}
.k.seam{border:0;height:2px;background:var(--coral);border-radius:0}
.k.na{border-style:dashed;border-color:var(--muted)}

/* step choreography: 0 folded, 1 unfolded, 2+ highlighted */
#viz[data-stage="0"] .cell,#viz[data-stage="0"] .layer-name{opacity:.13}
#viz[data-stage="0"] .gap-cell::before,#viz[data-stage="1"] .gap-cell::before{opacity:.25}
#viz[data-stage="0"] .badge.changed,#viz[data-stage="1"] .badge.changed{opacity:0}
#viz[data-stage="0"] .filament,#viz[data-stage="1"] .filament{opacity:0}
#viz:not([data-stage="0"]):not([data-stage="1"]) .cell[data-state=changed]{border-color:rgba(198,188,234,.75);background:#1d1d27;color:var(--violet)}
#viz:not([data-stage="0"]):not([data-stage="1"]) .cell[data-state=changed]::before{background:var(--violet)}
#viz:not([data-stage="0"]):not([data-stage="1"]) .cell[data-state=old-light]{border-color:rgba(240,207,139,.85);background:#2a2718;color:var(--gold);box-shadow:0 0 22px rgba(240,207,139,.18),inset 0 0 12px rgba(240,207,139,.06)}
#viz:not([data-stage="0"]):not([data-stage="1"]) .cell[data-state=old-light]::before{background:var(--gold);box-shadow:0 0 8px var(--gold)}
#viz[data-answer=FINDINGS]:not([data-stage="0"]):not([data-stage="1"]) .cell[data-seam=below]::after{content:"";position:absolute;left:-4px;right:-4px;bottom:-5px;height:2px;background:var(--coral);box-shadow:0 0 10px rgba(244,165,143,.7)}
.old-glow{fill:none;stroke:rgba(240,207,139,.22);stroke-width:7;filter:blur(3px)}
.old-path{fill:none;stroke:var(--gold);stroke-width:1.6;stroke-dasharray:7 6;animation:flow 1.6s linear infinite}
.old-dot{fill:var(--gold)}
@keyframes flow{to{stroke-dashoffset:-26}}

.tesseract-view{position:relative;display:flex;flex-direction:column;gap:10px}
#sky{width:100%;height:clamp(420px,56vh,620px);display:block;border-radius:8px;cursor:grab;touch-action:none}
.w-control{display:grid;grid-template-columns:auto 1fr auto auto;gap:14px;align-items:center;font-size:var(--fs-s)}
.w-control label{display:flex;align-items:center;gap:10px;color:var(--ink2)}
.w-glyph{display:inline-grid;place-items:center;width:26px;height:26px;border:1px solid var(--line2);border-radius:4px;font:var(--fs-xs) var(--mono);color:var(--gold)}
.w-control input{accent-color:var(--gold);width:100%}
.w-control output{font:var(--fs-xs) var(--mono);color:var(--muted);min-width:3.5ch}

.mode-panel{grid-column:1/-1;max-width:720px;margin:40px auto;padding:36px;border:1px solid var(--line2);border-radius:12px;background:rgba(12,22,19,.94);display:flex;flex-direction:column;gap:16px}
.mode-panel h2{font:400 36px/1.15 var(--serif)}
.mode-panel p{color:var(--ink2)}
.mode-panel .primary{align-self:flex-start}
.mode-panel:has(.recorded:not([hidden])){max-width:980px}
.recorded{display:grid;gap:16px}
.rec-methods{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.rec-card{border:1px solid var(--line2);border-radius:8px;padding:16px;background:var(--bg2);display:grid;gap:10px}
.rec-card b{color:var(--gold);font-size:var(--fs-s)}
.rec-facts{font-size:var(--fs-xs)}
@media (max-width:640px){.rec-methods{grid-template-columns:1fr}.mode-panel{padding:22px;margin:16px 0}.mode-panel h2{font-size:28px}}
body[data-source=unavailable] .narrative,body[data-source=unavailable] .viz,body[data-source=unavailable] .rail,body[data-source=unavailable] .reader{display:none}

/* rail */
.rail{display:grid;grid-template-columns:repeat(5,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--bg2)}
.rail button{border:0;border-right:1px solid var(--line);border-radius:0;text-align:left;padding:16px 22px;display:grid;gap:2px;position:relative}
.rail button:last-child{border-right:0}
.rail span{font:var(--fs-xs) var(--mono);color:var(--gold)}
.rail b{font-weight:600;font-size:var(--fs-s);color:var(--ink)}
.rail small{font-size:var(--fs-xs);color:var(--muted)}
.rail button[aria-current=step]{background:var(--surface)}
.rail button[aria-current=step]::after{content:"";position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--gold)}

/* reader */
.reader{padding:56px var(--pad) 40px;display:flex;flex-direction:column;gap:24px}
.reader-head{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;flex-wrap:wrap}
.reader-head h2{font:400 34px/1.2 var(--serif);margin:8px 0}
.reader-head p{color:var(--ink2);max-width:44em}
.reader-actions{display:flex;gap:8px}
.case-picker{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.pick{display:grid;gap:4px;text-align:left;padding:14px 16px;border-left:3px solid var(--line2);background:var(--bg2)}
.pick span{color:var(--ink2)}
.pick b{font-size:var(--fs-s)}
.pick[aria-checked=true]{background:var(--surface2);border-color:var(--line2)}
[data-tone=finding].pick{border-left-color:var(--coral)}[data-tone=finding].pick b{color:var(--coral)}
[data-tone=clean].pick{border-left-color:var(--mint)}[data-tone=clean].pick b{color:var(--mint)}
[data-tone=abstain].pick{border-left-color:var(--violet)}[data-tone=abstain].pick b{color:var(--violet)}
.grid{display:grid;grid-template-columns:1fr 1.15fr 1.3fr;gap:14px}
.panel{border:1px solid var(--line);border-radius:10px;background:var(--bg2);padding:20px;display:flex;flex-direction:column;gap:14px;min-width:0;font-size:var(--fs-s)}
.panel h3{font:500 var(--fs-m)/1.3 var(--sans);color:var(--ink);display:flex;gap:10px}
.panel h3 span{font:var(--fs-xs)/1.8 var(--mono);color:var(--gold)}
.panel p{color:var(--ink2)}
.checklist{list-style:none;margin:0;padding:0;display:grid;gap:6px}
.checklist li{display:flex;justify-content:space-between;gap:10px;padding:6px 10px;border-radius:5px;background:var(--surface)}
.checklist li small{font:var(--fs-xs) var(--mono);color:var(--mint)}
.checklist li.no{border:1px dashed var(--violet);background:transparent}
.checklist li.no small{color:var(--violet)}
.facts{display:grid;grid-template-columns:auto 1fr;gap:6px 14px;margin:0;font-size:var(--fs-xs)}
.facts dt{color:var(--muted)}
.facts dd{margin:0;font-family:var(--mono);color:var(--ink2);overflow-wrap:anywhere}
details summary{cursor:pointer;color:var(--gold);font-size:var(--fs-s)}
pre{max-height:320px;overflow:auto;font:var(--fs-xs)/1.5 var(--mono);color:var(--ink2);background:#050a09;border:1px solid var(--line);border-radius:6px;padding:12px;white-space:pre-wrap;overflow-wrap:anywhere}
.events{list-style:none;margin:0;padding:0 0 0 14px;border-left:1px solid var(--line2);display:grid;gap:10px}
.events li{position:relative;display:grid;gap:1px}
.events li::before{content:"";position:absolute;left:-19px;top:7px;width:9px;height:9px;border-radius:50%;background:var(--bg2);border:1px solid var(--mint)}
.events li.cited::before{background:var(--coral);border-color:var(--coral)}
.events li span{color:var(--ink)}
.events li small{font:var(--fs-xs) var(--mono);color:var(--muted)}
.method{border:1px solid var(--line);border-radius:8px;padding:14px;display:grid;gap:10px;background:var(--surface)}
.method-head{display:flex;justify-content:space-between;gap:10px;align-items:flex-start}
.tag{font:600 var(--fs-xs)/1.3 var(--sans);padding:3px 8px;border-radius:4px;border:1px solid;white-space:nowrap}
[data-tone=finding] .tag{color:var(--coral)}[data-tone=clean] .tag{color:var(--mint)}[data-tone=abstain] .tag{color:var(--violet)}
.finding{display:grid;gap:4px;padding:10px 12px;border-left:2px solid var(--coral);background:rgba(244,165,143,.06)}
.finding strong{color:var(--coral);font-size:var(--fs-s)}
.finding small{font:var(--fs-xs) var(--mono);color:var(--muted);overflow-wrap:anywhere}
.dims{display:flex;flex-wrap:wrap;gap:6px 16px;font-size:var(--fs-xs);color:var(--muted)}
.dims b{font-family:var(--mono);color:var(--ink)}
.chain{display:grid;grid-template-columns:minmax(260px,1fr) 1.6fr;gap:28px;align-items:center;border:1px solid rgba(240,207,139,.3);border-radius:12px;padding:24px;background:linear-gradient(120deg,rgba(240,207,139,.05),transparent 60%)}
.chain h3{font:400 26px/1.2 var(--serif);margin:6px 0 8px}
.chain p{color:var(--ink2);font-size:var(--fs-s)}
.chain-steps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:10px;counter-reset:c}
.chain-steps li{counter-increment:c;display:grid;gap:3px;padding:14px;border:1px solid var(--line);border-radius:8px;background:var(--bg2);font-size:var(--fs-s)}
.chain-steps li::before{content:"0" counter(c);font:var(--fs-xs) var(--mono);color:var(--gold)}
.chain-steps span{color:var(--ink2)}
.chain-steps small{font:var(--fs-xs) var(--mono);color:var(--muted)}
.provenance{display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap;padding-top:14px;border-top:1px solid var(--line)}
.provenance p{font:var(--fs-xs)/1.6 var(--mono);color:var(--muted);white-space:pre-line;overflow-wrap:anywhere;min-width:0;flex:1}

.footer{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;padding:22px var(--pad);border-top:1px solid var(--line);font-size:var(--fs-xs);color:var(--muted)}
.footer-brand{font-family:var(--mono);letter-spacing:.1em;color:var(--ink2)}
.footer p{font:italic 15px var(--serif);color:var(--ink2)}

dialog{max-width:760px;width:calc(100% - 32px);max-height:88vh;overflow:auto;background:#0c1614;color:var(--ink);border:1px solid var(--line2);border-radius:12px;padding:28px}
dialog::backdrop{background:rgba(3,7,6,.75)}
dialog h2{font:400 30px/1.2 var(--serif);margin:10px 0 14px}
dialog h3{font:600 var(--fs-m) var(--sans);margin:20px 0 8px}
dialog p,dialog li{color:var(--ink2);margin:0 0 10px}
.dialog-top{display:flex;justify-content:space-between;align-items:center}
.plain{padding-left:20px;margin:0}
.axes{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:0 0 12px}
.axes div{border:1px solid var(--line);border-radius:8px;padding:12px}
.axes b{color:var(--gold);font-size:var(--fs-s)}
.axes p{font-size:var(--fs-s);margin:4px 0 0}
.keys{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0}
.keys span{font:var(--fs-xs) var(--mono);border:1px solid var(--line);border-radius:4px;padding:4px 8px;color:var(--muted)}
.motion{font-size:var(--fs-s);color:var(--ink2);display:flex;gap:8px;align-items:center}
.toast{position:fixed;bottom:22px;left:50%;transform:translateX(-50%);background:var(--ink);color:var(--bg);padding:10px 16px;border-radius:6px;font-size:var(--fs-s);z-index:50}

/* presentation: one screen, no reader */
body.presentation{--fs-xs:16px;--fs-s:19px;--fs-m:21px;height:100vh;overflow:hidden;display:flex;flex-direction:column}
body.presentation .cell{min-height:0;padding:6px 12px}
body.presentation .stack{gap:5px 10px}
body.presentation .star{margin:4px 0 8px}
body.presentation .ep-head{padding:2px 4px 8px}
body.presentation .rail button{padding:12px 22px}
body.presentation .disclosure{padding-top:8px;padding-bottom:8px}
body.presentation .topbar{padding-top:10px;padding-bottom:10px}
body.presentation .card{padding:16px 20px;gap:8px}
body.presentation .card h2{font-size:26px}
body.presentation .lead{font-size:21px}
body.presentation main{flex:1;display:flex;flex-direction:column;min-height:0}
body.presentation .stage{flex:1;min-height:0;padding-top:20px;padding-bottom:16px;align-items:center}
body.presentation .reader,body.presentation .footer{display:none}
body.presentation #sky{height:calc(100vh - 480px)}
body.presentation .stage{grid-template-columns:minmax(480px,560px) minmax(0,1fr);align-items:start}
body.presentation h1{font-size:clamp(40px,2.5vw,48px)}
body.presentation .narrative{gap:12px}
body.presentation .answer{grid-template-columns:1fr auto auto;padding:8px 12px}
body.presentation .answer .label{grid-column:auto}
body.presentation .answer small{display:none}

/* tablet */
@media (max-width:1180px){
  .topbar{grid-template-columns:auto 1fr auto}.modes{grid-column:1/-1;order:3;justify-content:flex-start}
  .stage{grid-template-columns:1fr}.grid{grid-template-columns:1fr 1fr}.grid .panel:last-child{grid-column:1/-1}
  .chain{grid-template-columns:1fr}
}
/* phone */
@media (max-width:640px){
  :root{--gap:18px}
  .topbar{gap:12px;padding-top:12px;padding-bottom:12px}
  /* Q73/334: at phone widths the top bar is two columns — brand | guide — with the SN87 return pill on its own
     full-width row beneath and the mode buttons below that; the brand may shrink and wrap instead of clipping. */
  .topbar{grid-template-columns:minmax(0,1fr) auto}
  .brand{min-width:0}.brand span{min-width:0}.brand b,.brand small{overflow-wrap:anywhere}
  .return{grid-column:1/-1;order:2;justify-self:start}
  .brand b{font-size:17px;letter-spacing:.24em}.brand small{font-size:13px;letter-spacing:0}
  #guide-open{padding:0;width:40px;height:40px;border-color:var(--line2);border-radius:50%}#guide-open .gl,.d-only{display:none}#guide-open .gq{display:inline}
  .brand small{font-family:var(--sans)}
  .modes{display:grid;grid-template-columns:repeat(3,1fr);gap:4px}
  .modes button{min-width:0;padding:8px}
  .disclosure{flex-direction:column;gap:6px}
  .stage{padding-top:28px;gap:28px}
  h1{font-size:32px}
  .stack{grid-template-columns:78px var(--cols);gap:5px 5px}
  .layer-name{font-size:13px;line-height:1.2;justify-content:flex-start;text-align:left;hyphens:auto}
  .cell{padding:6px 6px;min-height:40px;font-size:13px}
  .cell::before{display:none}
  .cell .full{display:none}.cell .short{display:inline}
  .ep-head .when{display:none}
  .ep-word{display:none}.ep-abbr{display:inline}
  .ep-head .who{font-size:13px}
  .star::before{width:24px}.star::after{height:24px}
  .gap-head{padding-bottom:10px}
  .gap-head .badge{display:none}
  .gap-note{display:block}
  #viz[data-stage="0"] .gap-note,#viz[data-stage="1"] .gap-note{color:var(--muted)}
  .corner{font-size:13px;letter-spacing:.1em}
  .rail{grid-template-columns:repeat(5,minmax(0,1fr))}
  .rail button{padding:12px 6px;text-align:center;justify-items:center}
  .rail b,.rail small{display:none}
  .case-picker,.grid,.chain-steps{grid-template-columns:1fr}
  .axes{grid-template-columns:1fr}
  .w-control{grid-template-columns:1fr auto;}.w-control label{grid-column:1/-1}
  #sky{height:420px}
  .reader-head h2{font-size:28px}
}