/* Responsive composition for the respirometer lesson; apparatus coordinates stay unchanged. */
.tk-resp .rs-readouts{gap:0;background:var(--bg-c);border:1px solid var(--bd);border-radius:var(--r);box-shadow:var(--sh-e);overflow:hidden}
.tk-resp .rs-readouts .tk-stat{border:0;border-radius:0;box-shadow:none;min-height:116px;padding:1.1rem;align-content:start;column-gap:.75rem}
.tk-resp .rs-readouts .tk-stat+.tk-stat{border-left:1px solid var(--bd)}
.tk-resp .rs-readouts .tk-stat-val{font-size:1.5rem;line-height:1.35}
.tk-resp .rs-readouts .tk-stat-lbl{font-size:.81rem;line-height:1.6}
.tk-resp .rs-readouts .tk-stat-sub{font-size:.76rem;line-height:1.6}
.tk-resp .rs-readouts .tk-stat-ic{width:38px;height:38px;box-shadow:none}
.tk-resp .rs-experiment{min-width:0}
.tk-resp .rs-workspace{display:grid;grid-template-columns:minmax(0,1fr) 320px;align-items:stretch}
.tk-resp .rs-scene-panel{min-width:0;display:flex;flex-direction:column;background:var(--bg-c)}
.tk-resp .rs-scene-viewport{min-width:0;flex:1;display:grid;align-items:center;overflow:auto;overscroll-behavior:contain}
.tk-resp .rs-scene-viewport:focus-visible{outline:3px solid var(--c-500);outline-offset:-3px}
.tk-resp .rs-scene-viewport .lb-stage{width:100%;flex:none}
.tk-resp .rs-scene-viewport.is-zoomed{display:block;flex:none;height:clamp(340px,44vw,600px)}
.tk-resp .rs-scene-viewport.is-zoomed .lb-stage{width:max(100%,1200px);margin:0}
.tk-resp .rs-viewbar{flex-shrink:0;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:.75rem 1rem;padding:.7rem 1rem;border-top:1px solid var(--bd);background:var(--bg-c)}
.tk-resp .rs-speed{display:flex;align-items:center;gap:.65rem;flex-wrap:wrap}
.tk-resp .rs-speed>span{font-size:.8rem;font-weight:600;color:var(--t2)}
.tk-resp .rs-speed .tk-seg button{min-width:48px;min-height:44px;padding:.35rem .65rem;color:var(--t2)}
.tk-resp .rs-speed .tk-seg button[aria-pressed="true"]{background:#1d4ed8;color:#fff}
.tk-resp .rs-viewbar .tk-switch{min-height:44px;font-size:.82rem;color:var(--t2)}
.tk-resp .rs-viewbar .tk-btn{min-height:44px;font-size:.82rem}
.tk-resp .rs-scene-hint{flex-shrink:0;display:flex;align-items:center;justify-content:center;gap:.5rem;margin:0;padding:.65rem 1rem;border-top:1px solid var(--bd);font-size:.8rem;line-height:1.7;color:var(--t2);background:var(--bg-m);text-align:center}
.tk-resp .rs-scene-hint>i{color:var(--c-500)}
.tk-resp .rs-controls{min-width:0;display:flex;flex-direction:column;border-left:1px solid var(--bd);background:var(--bg-m)}
.tk-resp .rs-controls .lb-toolbar{display:grid;gap:1.2rem;padding:1.25rem;border-top:0;background:transparent}
.tk-resp .rs-control-intro h3{margin:0 0 .35rem;font:700 1rem/1.5 var(--f-b);color:var(--t1)}
.tk-resp .rs-control-intro p{margin:0;font-size:.86rem;line-height:1.75;color:var(--t2)}
.tk-resp .rs-controls .rs-temp-control{padding:1rem;border:1px solid var(--bd);border-radius:var(--rs);background:var(--bg-c)}
.tk-resp .rs-temp-control h3{margin:0 0 .65rem;color:var(--t1);font-size:.86rem;line-height:1.6}
.tk-resp .rs-temp-control .lb-temp{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:.6rem;margin:0}
.tk-resp .rs-temp-control .lb-temp input{width:100%;min-width:0;height:44px;margin:0}
.tk-resp .rs-temp-control .lb-temp output{font:700 1.25rem/1.5 var(--f-b);min-width:3.5em}
.tk-resp .rs-temp-control .lb-temp-tk{padding:0 5.2em 0 .2em;color:var(--t2)}
.tk-resp .rs-temp-control p{font-size:.8rem;line-height:1.75;color:var(--t2);margin:.65rem 0 0}
.tk-resp .rs-temp-control .tk-bd{margin-left:.35rem}
.tk-resp .rs-primary-actions{display:grid;gap:.65rem}
.tk-resp .rs-controls .tk-btn{min-width:0;width:100%;min-height:44px;font-size:.9rem;line-height:1.5;white-space:normal;padding:.7rem .75rem}
.tk-resp .rs-controls .tk-btn-primary{min-height:48px;box-shadow:0 4px 12px rgba(29,78,216,.18)}
.tk-resp .rs-observation{padding-top:1rem;border-top:1px solid var(--bd)}
.tk-resp .rs-observation h4{display:flex;gap:.5rem;align-items:center;margin:0 0 .5rem;font:600 .85rem/1.6 var(--f-b);color:var(--t1)}
.tk-resp .rs-observation h4 i{color:var(--c-500)}
.tk-resp .rs-observation p{margin:0;font-size:.83rem;line-height:1.8;color:var(--t2)}
.tk-resp .rs-observation>span{display:flex;gap:.45rem;align-items:center;margin-top:.75rem;font-size:.76rem;line-height:1.7;color:var(--t2)}
.tk-resp .rs-observation>span i{color:#059669}
.tk-resp .rs-controls .lb-status{margin:0;margin-top:auto;min-height:108px;padding:1rem 1.25rem;border-top:1px solid var(--bd);font-size:.82rem;line-height:1.75;color:var(--t2);background:var(--bg-c)}
.tk-resp .rs-controls .lb-status>i{margin-top:.3rem}

.tk-resp .rs-model .tk-fsheet{display:grid;grid-template-columns:1fr 1.1fr 1fr}
.tk-resp .rs-model .tk-frow{min-width:0;padding:1.25rem;border-bottom:0}
.tk-resp .rs-model .tk-frow+.tk-frow{border-left:1px solid var(--bd)}
.tk-resp .rs-model .tk-frow h3{font-size:.9rem;line-height:1.6;color:var(--t1);margin-bottom:.8rem}
.tk-resp .rs-model .tk-math{font-size:1.15rem;font-weight:600;line-height:1.8;overflow-wrap:anywhere}
.tk-resp .rs-formula-result{margin:.6rem 0 .75rem;padding:.65rem .75rem;border-radius:8px;background:var(--bg-m);font-size:.82rem;line-height:1.8;color:var(--t2)}
.tk-resp .rs-formula-result b{font-size:1rem;color:var(--tk-tint-ink)}
.tk-resp .rs-model .tk-frow p{font-size:.85rem;line-height:1.8;color:var(--t2)}
.tk-resp .rs-vars{display:grid;grid-template-columns:auto minmax(0,1fr);gap:.65rem .7rem;margin:0;font-size:.85rem;line-height:1.75;color:var(--t2)}
.tk-resp .rs-vars dt{font-weight:600;color:var(--t1)}
.tk-resp .rs-vars dd{margin:0;min-width:0}
.tk-resp .rs-guides{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--bd)}
.tk-resp .rs-guides details{min-width:0;padding:.4rem 1.25rem}
.tk-resp .rs-guides details+details{border-left:1px solid var(--bd)}
.tk-resp .rs-guides summary{min-height:44px;padding:.6rem 0;cursor:pointer;font:600 .86rem/1.7 var(--f-b);color:var(--t2)}
.tk-resp .rs-guides summary i{margin:0 .4rem;color:var(--c-500)}
.tk-resp .rs-guides summary:focus-visible{outline:3px solid var(--c-500);outline-offset:3px;border-radius:4px}
.tk-resp .rs-guides .rs-vars,.tk-resp .rs-guides .tk-keys{padding:.4rem 0 1rem;line-height:1.75}
.tk-resp .rs-results-intro{margin:0 0 1.2rem;font-size:.9rem;line-height:1.8;color:var(--t2)}
.tk-resp .rs-results-grid{grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);align-items:stretch;gap:1.25rem}
.tk-resp .rs-chart{min-width:0;padding:1rem;border:1px solid var(--bd);border-radius:var(--rs);background:var(--bg-m)}
.tk-resp .rs-chart h3{font:600 .86rem/1.7 var(--f-b);color:var(--t2);margin:0 0 1rem}
.tk-resp .rs-log{min-width:0;display:flex;flex-direction:column;border:1px solid var(--bd);border-radius:var(--rs);overflow:hidden}
.tk-resp .rs-log .tk-tbl-wrap{flex:1;display:flex;flex-direction:column;min-width:0;border:0;border-radius:0}
.tk-resp .rs-log .tk-tbl{flex:none;min-width:540px;margin:0}
.tk-resp .rs-log .tk-tbl thead th{white-space:normal;line-height:1.5;vertical-align:middle;font-size:.78rem;padding:.8rem .55rem}
.tk-resp .rs-log .tk-tbl tbody td{padding:.8rem .55rem;font-size:.85rem}
.tk-resp .rs-log .tk-tbl-wrap:has(.tk-tbl-empty) .tk-tbl{flex:1}
.tk-resp .rs-log .tk-tbl-empty td{white-space:normal;vertical-align:middle;line-height:1.8;padding:2rem}
.tk-resp .rs-log .tk-tbl-empty td>i{display:grid;place-items:center;width:48px;height:48px;border-radius:50%;margin:0 auto .75rem;background:var(--tk-tint);color:var(--tk-tint-ink);font-size:1.1rem}
.tk-resp .rs-log-note{flex:none;display:flex;align-items:flex-start;gap:.5rem;margin:0;padding:.75rem 1rem;border-top:1px solid var(--bd);background:var(--bg-m);font-size:.8rem;line-height:1.7;color:var(--t2)}
.tk-resp .rs-log-note>i{color:var(--c-500);margin-top:.3rem}

.tk-resp #lbCard:fullscreen,.tk-resp #lbCard:-webkit-full-screen{justify-content:flex-start}
.tk-resp #lbCard:fullscreen .rs-workspace,.tk-resp #lbCard:-webkit-full-screen .rs-workspace{flex:1;min-height:0}
.tk-resp #lbCard:fullscreen .rs-scene-viewport,.tk-resp #lbCard:-webkit-full-screen .rs-scene-viewport{min-height:0}
.tk-resp #lbCard:fullscreen .lb-stage,.tk-resp #lbCard:-webkit-full-screen .lb-stage{width:min(100%,calc((100vh - 220px) * 1.519));margin:auto}
.tk-resp #lbCard:fullscreen .rs-controls,.tk-resp #lbCard:-webkit-full-screen .rs-controls{overflow:auto}
.tk-resp #lbCard:fullscreen .is-zoomed .lb-stage,.tk-resp #lbCard:-webkit-full-screen .is-zoomed .lb-stage{width:max(100%,1200px);margin:0}
@media(min-width:901px){
  .tk-resp .tk-why-it:last-child:nth-child(odd)>div{flex:1;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));column-gap:calc(3.65rem + 32px);align-content:start}
  .tk-resp .tk-why-it:last-child:nth-child(odd)>div>h3{grid-column:1/-1}
  .tk-resp .tk-why-it:last-child:nth-child(odd) p{margin:0}
}
@media(max-width:1100px){
  .tk-resp .rs-workspace{grid-template-columns:minmax(0,1fr) 290px}
  .tk-resp .rs-controls .lb-toolbar{padding:1rem;gap:1rem}
  .tk-resp .rs-controls .lb-status{padding:1rem}
  .tk-resp .rs-model .tk-fsheet{grid-template-columns:1fr 1fr}
  .tk-resp .rs-model .tk-frow:first-child{grid-column:1/-1;border-bottom:1px solid var(--bd)}
  .tk-resp .rs-model .tk-frow:nth-child(2){border-left:0}
  .tk-resp .rs-results-grid{grid-template-columns:minmax(0,1fr)}
}
@media(max-width:1000px){
  .tk-resp .rs-workspace{grid-template-columns:minmax(0,1fr)}
  .tk-resp .rs-controls{border-left:0;border-top:1px solid var(--bd)}
  .tk-resp .rs-controls .lb-toolbar{grid-template-columns:1fr 1fr;align-items:start;gap:1rem 1.25rem;padding:1.25rem}
  .tk-resp .rs-control-intro{grid-column:1/-1}
  .tk-resp .rs-controls .rs-temp-control{grid-row:2/4}
  .tk-resp .rs-observation{padding-top:0;border-top:0}
  .tk-resp .rs-controls .lb-status{min-height:0;padding:1rem 1.25rem}
  .tk-resp #lbCard:fullscreen .rs-controls,.tk-resp #lbCard:-webkit-full-screen .rs-controls{overflow:visible}
}
@media(max-width:900px){
  .tk-resp .rs-readouts .tk-stat{min-height:110px}
  .tk-resp .rs-readouts .tk-stat:nth-child(3){border-left:0}
  .tk-resp .rs-readouts .tk-stat:nth-child(n+3){border-top:1px solid var(--bd)}
}
@media(max-width:560px){
  .tk-resp .rs-readouts .tk-stat{display:flex;flex-direction:column;align-items:flex-start;gap:0;min-height:150px;padding:.9rem}
  .tk-resp .rs-readouts .tk-stat-ic{width:28px;height:28px;border-radius:8px;font-size:.78rem;margin-bottom:.5rem}
  .tk-resp .rs-readouts .tk-stat-val{font-size:1.35rem}
  .tk-resp .rs-readouts .tk-stat-val small{font-size:.72rem}
  .tk-resp .rs-readouts .tk-stat-lbl{font-size:.78rem}
  .tk-resp .rs-readouts .tk-stat-sub{font-size:.75rem}
  .tk-resp .rs-viewbar{gap:.6rem;padding:.8rem}
  .tk-resp .rs-speed{flex-basis:100%;justify-content:space-between}
  .tk-resp .rs-speed .tk-seg{flex:1;max-width:220px;display:grid;grid-template-columns:repeat(3,1fr)}
  .tk-resp .rs-scene-viewport.is-zoomed{height:440px}
  .tk-resp .rs-scene-hint{font-size:.76rem;padding:.65rem .8rem}
  .tk-resp .rs-controls .lb-toolbar{grid-template-columns:minmax(0,1fr);padding:1rem;gap:1rem}
  .tk-resp .rs-controls .rs-temp-control{grid-row:auto}
  .tk-resp .rs-primary-actions{grid-template-columns:minmax(0,1.5fr) minmax(0,1fr)}
  .tk-resp .rs-controls .lb-toolbar .tk-btn{font-size:.84rem;padding:.6rem .5rem}
  .tk-resp .rs-observation{padding-top:1rem;border-top:1px solid var(--bd)}
  .tk-resp .rs-controls .lb-status{padding:1rem}
  .tk-resp .rs-model .tk-fsheet,.tk-resp .rs-guides{grid-template-columns:minmax(0,1fr)}
  .tk-resp .rs-model .tk-frow{padding:1rem}
  .tk-resp .rs-model .tk-frow+.tk-frow{border-left:0;border-top:1px solid var(--bd)}
  .tk-resp .rs-model .tk-frow:first-child{border-bottom:0}
  .tk-resp .rs-guides details{padding:.3rem 1rem}
  .tk-resp .rs-guides details+details{border-left:0;border-top:1px solid var(--bd)}
  .tk-resp .rs-chart{padding:.75rem}
}
@media(prefers-reduced-motion:reduce){.tk-resp #parts,.tk-resp #chevE{visibility:hidden}}