/* Gas Laws Lab: styles. The shared lab look (header, tabs, cards, buttons, data table, dialogs, tests, dark-mode
 * tokens) is copied from the Solutions Lab (itself from the Membrane Transport Lab); the block at the end is new. */
:root{
  --ink:#0b1f33;--ink2:#2b4055;--muted:#52667a;--bg:#e8ecf0;--card:#fff;--line:#0b1f33;--soft:#c9d3dc;--field:#fff;
  --accent:#0a5fc0;--accent-h:#084a99;--warn:#8a4b00;--ok:#0b6e4f;--bad:#a61b1b;--focus:#ffb800;
  --hdr:#0b1f33;--hover:#e4edf7;--tint:#f2f7fc;--thbg:#dfe8f1;--safety:#fff4d6;--oktint:#eafaf3;--badtint:#fff0f0;--warntint:#fff9ec;
  --radius:12px;
}
html[data-theme="dark"]{
  --ink:#e3ecf5;--ink2:#c3d2e0;--muted:#a3b6c8;--bg:#0d1620;--card:#15212e;--line:#7f97ad;--soft:#2f4356;--field:#0f1a25;
  --accent:#2f7fe0;--accent-h:#1f66bd;--warn:#ffc46b;--ok:#5fd6a6;--bad:#ff8a80;
  --hdr:#07131f;--hover:#1f3347;--tint:#1a2a3a;--thbg:#1f3144;--safety:#2e2412;--oktint:#123126;--badtint:#3a1818;--warntint:#2c2414;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.45 system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
h1,h2,h3{line-height:1.2;margin:.2em 0 .5em}
h1{font-size:1.35rem}h2{font-size:1.3rem}h3{font-size:1.05rem;margin-top:1em}
p{margin:.5em 0}
a{color:var(--accent)}
html[data-theme="dark"] a{color:#8cc2ff}
.skip{position:absolute;left:-999px;top:0;background:#fff;color:#0b1f33;padding:8px;z-index:100}
.skip:focus{left:8px}
.sr{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
button,input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:4px solid var(--focus);outline-offset:2px}
header#top{background:var(--hdr);color:#fff;padding:8px 14px;display:flex;flex-wrap:wrap;gap:8px 16px;align-items:center;position:sticky;top:var(--tlg-hh,0px);z-index:20;scroll-margin-top:var(--tlg-hh,0px)}
header#top h1{margin:0;color:#fff;white-space:nowrap}
#tabs{display:flex;gap:6px;flex-wrap:wrap;flex:1 1 auto}
#tabs button{background:transparent;color:#fff;border:2px solid #7f95aa;border-radius:10px;padding:8px 14px;min-height:44px;cursor:pointer;font-weight:600;font-size:16px}
#tabs button[aria-selected=true]{background:#fff;color:#0b1f33;border-color:#fff}
#tabs button:disabled{opacity:.45;cursor:not-allowed}
.tools{display:flex;gap:6px;align-items:center;flex-wrap:wrap}
.tools .btn{min-height:44px;padding:6px 12px;font-size:16px;background:#fff;color:#0b1f33;border-color:#0b1f33}
.tools .btn:hover:not(:disabled),.tools .btn:focus-visible{background:#dbe9f7;color:#0b1f33}
#saveStat{font-size:16px;color:#c9d7e4}
@media(min-width:1200px){header#top{flex-wrap:nowrap;padding:6px 12px;gap:10px}header#top h1{font-size:1.1rem}#tabs{flex-wrap:nowrap;gap:4px}#tabs button{padding:5px 9px;white-space:nowrap}.tools{flex-wrap:nowrap}.tools .btn{padding:4px 9px;white-space:nowrap}#saveStat{display:none}}
@media(min-width:1200px) and (max-width:1560px){header#top h1{white-space:normal;max-width:13em;line-height:1.12}}
@media(max-width:700px){header#top{position:static}header#top h1{white-space:normal;font-size:1.15rem}}
#tabs .tl{display:none}
@media(min-width:1200px){#tabs .tlong{display:none}#tabs .tl{display:inline}}
main{max-width:1500px;margin:0 auto;padding:12px;overflow-x:clip}
@media(max-width:640px){main{padding:12px 8px}}
.panel[hidden]{display:none}
.card{background:var(--card);border:3px solid var(--line);border-radius:var(--radius);padding:12px 16px;margin-bottom:12px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.grid2>*,.grid3>*{min-width:0}
@media(max-width:900px){.grid2,.grid3{grid-template-columns:1fr}}
.btn{background:var(--card);color:var(--ink);border:3px solid var(--line);border-radius:10px;padding:8px 14px;min-height:44px;cursor:pointer;font-weight:650}
.btn:hover:not(:disabled){background:var(--hover)}
.btn.pri{background:var(--accent);color:#fff;border-color:var(--line)}
.btn.pri:hover:not(:disabled){background:var(--accent-h)}
.btn.danger{border-color:var(--bad);color:var(--bad)}
.btn:disabled{opacity:.45;cursor:not-allowed}
.big{width:100%;font-size:1.05rem;padding:12px}
.bar{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:6px 0 10px}
.bar label{display:flex;gap:6px;align-items:center;font-weight:600}
label.f{display:block;font-weight:650;margin:.6em 0 .2em}
input[type=text],input[type=number],input:not([type]),select,textarea{border:3px solid var(--line);border-radius:8px;padding:8px 10px;background:var(--field);width:100%;min-height:44px}
textarea{min-height:120px;resize:vertical}
input[type=checkbox],input[type=radio]{accent-color:var(--accent);width:22px;height:22px}
.small{font-size:16px;color:var(--muted)}
.hint{font-size:16px;color:var(--muted);min-height:1.3em}
.hint.ok{color:var(--ok);font-weight:650}
.safety{background:var(--safety);border:3px solid #8a4b00;border-radius:10px;padding:8px 14px}
.safety ul{margin:.3em 0;padding-left:1.2em}
fieldset{border:3px solid var(--line);border-radius:10px;margin:.7em 0;padding:8px 12px;min-width:0}
legend{font-weight:700;padding:0 6px}
kbd{background:var(--card);border:2px solid var(--line);border-radius:5px;padding:0 5px;font:600 1em ui-monospace,monospace}
details>summary{cursor:pointer;font-weight:700;min-height:32px}
.eq{font-size:1.35rem;font-weight:700;text-align:center;padding:10px;border:3px dashed var(--line);border-radius:10px;margin:8px 0;background:var(--tint)}
.eq span{font-size:1rem;font-weight:600;color:var(--ink2);display:inline-block;margin:0 6px}
.chip{border:2px solid var(--line);border-radius:20px;padding:2px 10px;font-size:16px;background:var(--tint);white-space:nowrap}
.checklist{list-style:none;padding:0;margin:.4em 0}
.checklist li{padding:4px 0}
.checklist li::before{content:"☐ ";font-weight:800}
.checklist li.done::before{content:"☑ ";color:var(--ok)}
.checklist li.done{color:var(--ok);font-weight:650}
.seg{display:flex;flex-wrap:wrap;gap:4px}
.seg button{border:2px solid var(--line);border-radius:8px;background:var(--card);color:var(--ink);min-height:44px;min-width:44px;padding:4px 10px;cursor:pointer;font-weight:700;font-size:16px}
.seg button[aria-pressed=true]{background:var(--accent);color:#fff}
.segLbl{font-weight:700;align-self:center;margin-right:2px}
#menu{position:fixed;z-index:50;background:var(--card);color:var(--ink);border:3px solid var(--line);border-radius:10px;padding:6px;min-width:220px}
#toast{position:fixed;left:50%;bottom:16px;transform:translate(-50%,20px);background:#0b1f33;color:#fff;padding:10px 18px;border-radius:10px;opacity:0;pointer-events:none;transition:.25s;z-index:70;max-width:min(92vw,720px);text-align:center;font-weight:600}
#toast.show{opacity:1;transform:translate(-50%,0)}
dialog{border:4px solid var(--line);border-radius:14px;padding:0;max-width:min(94vw,720px);width:100%;background:var(--card);color:var(--ink)}
dialog::backdrop{background:rgba(11,31,51,.6)}
#dlgT{margin:0;padding:12px 18px;background:var(--hdr);color:#fff;font-size:1.15rem}
#dlgB{padding:10px 18px;max-height:64vh;overflow:auto}
#dlgF{display:flex;flex-wrap:wrap;gap:8px;justify-content:flex-end;padding:10px 18px 16px}
.vocab{font:inherit;color:inherit;background:none;border:0;padding:0;border-bottom:2px dotted var(--accent);cursor:help}
#vocabPop{position:fixed;z-index:80;max-width:min(92vw,360px);background:var(--card);color:var(--ink);border:3px solid var(--line);border-radius:10px;padding:8px 12px;box-shadow:0 8px 24px rgba(0,0,0,.35);font-size:16px}
#vocabPop[hidden]{display:none}
.gateCard{max-width:880px;margin:30px auto}
.gateGrid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media(max-width:700px){.gateGrid{grid-template-columns:1fr}}
.gateBtn{display:flex;flex-direction:column;gap:6px;text-align:left;border:3px solid var(--line);border-radius:14px;background:var(--card);color:var(--ink);padding:16px;cursor:pointer;min-height:120px;font:inherit}
.gateBtn b{font-size:1.25rem}.gateBtn span{color:var(--muted)}
.gateBtn:hover{background:var(--hover)}

/* ───────────── new for this lab ───────────── */
/* pre-lab */
.labPick{display:grid;grid-template-columns:1fr 1fr;gap:10px;border:0;padding:0;margin:.6em 0}
.labPick legend{padding:0;margin-bottom:6px}
@media(max-width:560px){.labPick{grid-template-columns:1fr}}
.labCard{position:relative;display:block;border:3px solid var(--line);border-radius:12px;padding:10px 12px 10px 42px;cursor:pointer;background:var(--card);min-height:92px}
.labCard input{position:absolute;left:12px;top:14px;margin:0}
.labCard b{display:block;font-size:1.05rem}
.labCard span{display:block;font-size:16px;color:var(--muted);margin-top:2px}
.labCard:has(input:checked){border-color:var(--accent);background:var(--tint);box-shadow:0 0 0 2px var(--accent) inset}
.labCard:has(input:focus-visible){outline:4px solid var(--focus);outline-offset:2px}
.qBox{background:var(--tint);border:2px solid var(--soft);border-radius:10px;padding:8px 12px;margin:.6em 0}
.qBox .q{font-weight:750;font-size:1.05rem}
.predOpts{display:flex;flex-wrap:wrap;gap:6px 14px;margin:.3em 0}
.predOpts label{display:flex;gap:6px;align-items:center;font-weight:600;min-height:40px;cursor:pointer}
.predSel{display:grid;grid-template-columns:auto 1fr;gap:6px 10px;align-items:center;margin:.3em 0}
.predSel select{min-height:40px;padding:4px 8px}
/* variable labels: drag (or tap, then tap a box) */
.varPool{display:flex;flex-wrap:wrap;gap:8px;min-height:52px;border:2px dashed var(--soft);border-radius:10px;padding:6px 10px;margin:8px 0}
.varBins{display:grid;grid-template-columns:1fr 1fr 1.4fr;gap:8px}
@media(max-width:700px){.varBins{grid-template-columns:1fr}}
.varBin{border:3px solid var(--line);border-radius:12px;padding:6px 8px;min-height:110px;background:var(--tint);display:flex;flex-wrap:wrap;gap:6px;align-content:flex-start;cursor:pointer}
.varBin h4{width:100%;margin:2px 0 2px;font-size:16px}
.varBin.hot{outline:4px dashed var(--accent);outline-offset:2px}
.varChip{border:2px solid var(--line);border-radius:20px;padding:6px 12px;min-height:44px;background:var(--card);color:var(--ink);font:inherit;font-size:16px;font-weight:700;cursor:grab;touch-action:none;text-align:left}
.varChip.picked{background:var(--accent);color:#fff}
.varChip.wrong{border-color:var(--bad);background:var(--badtint);color:var(--ink)}
.varChip.right{border-color:var(--ok)}
.varGhost{position:fixed;pointer-events:none;z-index:90;opacity:.85}
/* bench */
#benchBar{display:flex;flex-wrap:wrap;gap:6px 10px;align-items:center;padding:6px 10px;margin-bottom:8px}
#benchBar .btn{min-height:44px;padding:3px 10px;font-size:16px}
.benchWrap{display:grid;grid-template-columns:minmax(0,1fr) 370px;gap:12px;align-items:start}
.benchWrap>*{min-width:0}
.stageBox{position:relative;background:#1b242e;border:3px solid var(--line);border-radius:var(--radius);overflow:hidden;-webkit-user-select:none;user-select:none}
#cv{display:block;width:100%;aspect-ratio:1000/600;touch-action:pan-y;cursor:crosshair}
.pausedVeil{position:absolute;left:50%;top:12px;transform:translateX(-50%);background:#0b1f33;color:#fff;padding:8px 16px;border-radius:10px;font-weight:700;box-shadow:0 4px 14px rgba(0,0,0,.35)}
.zoomBtns{position:absolute;right:10px;top:10px;display:flex;flex-direction:column;gap:6px}
.zoomBtns button{width:44px;height:44px;border-radius:10px;border:2px solid #0b1f33;background:rgba(255,255,255,.92);color:#0b1f33;font:800 22px/1 system-ui;cursor:pointer}
.zoomBtns button:disabled{opacity:.4;cursor:not-allowed}
.stageNote{padding:6px 12px;background:#0b1f33;color:#e7eef5;font-size:16px;display:flex;flex-wrap:wrap;align-items:center;gap:4px 10px;min-height:44px}
.side{display:flex;flex-direction:column;gap:10px;position:sticky;top:calc(var(--tlg-hh,0px) + var(--lab-hh,0px) + 8px);max-height:calc(100vh - var(--tlg-hh,0px) - var(--lab-hh,0px) - 16px);overflow:auto;overscroll-behavior:contain}
.side .card{margin:0;padding:10px 12px}
.side h3{margin:0 0 .35em;font-size:1.05rem}
@media(max-width:1060px){.benchWrap{grid-template-columns:minmax(0,1fr)}.side{position:static;max-height:none;overflow:visible}}
/* the one next step, in the strip under the picture */
.stageNote b{color:#ffd27a}
.stageNote .chipRow{display:inline-flex;flex-wrap:wrap;gap:4px;margin-left:6px}
.stageNote .chipRow span{border:1px solid #7f95aa;border-radius:12px;padding:0 7px}
.stageNote .chipRow span.ok{background:#1d5a3f;border-color:#5fd6a6}
.stageNote .btn{min-height:44px;padding:0 12px;font-size:16px;background:#fff;color:#0b1f33;border-width:2px}
@media(min-width:1001px){#toast{top:calc(var(--tlg-hh,0px) + var(--lab-hh,0px) + 10px);bottom:auto;transform:translate(-50%,-20px)}#toast.show{transform:translate(-50%,0)}}
/* guided steps */
#stepsCard .recipe{list-style:none;margin:.2em 0;padding:0}
#stepsCard .recipe li{display:grid;grid-template-columns:1.5em 1fr;gap:0 4px;align-items:baseline;padding:4px 6px;border-radius:8px;border:2px solid transparent;font-size:16px}
#stepsCard .recipe li .box::before{content:"☐";font-weight:800;font-size:1.15em}
#stepsCard .recipe li.done .box::before{content:"☑";color:var(--ok)}
#stepsCard .recipe li.done .txt{color:var(--ok)}
#stepsCard .recipe li.next{border-color:var(--accent);background:var(--tint)}
#stepsCard .recipe li .sub{grid-column:2;font-size:16px;color:var(--muted)}
#stepsCard .recipe.compact li:not(.next){display:none}
.need{display:flex;flex-wrap:wrap;gap:4px;margin-top:4px}
.need span{border:2px solid var(--line);border-radius:14px;padding:0 8px;font-size:16px;background:var(--card)}
.need span.ok{background:var(--oktint);border-color:var(--ok);color:var(--ok);font-weight:700}
.need span.ok::before{content:"✓ "}
.prog{height:12px;border:2px solid var(--line);border-radius:8px;overflow:hidden;background:var(--field);margin:4px 0}
.prog>div{height:100%;background:var(--ok);transition:width .4s}
/* data table */
.tableWrap{overflow-x:auto;border:3px solid var(--line);border-radius:10px}
table#dt{border-collapse:collapse;width:100%;min-width:860px;background:var(--card)}
#dt th{background:var(--thbg);border:2px solid var(--line);padding:6px;font-size:16px;text-align:left;vertical-align:bottom}
#dt td{border:2px solid var(--line);padding:4px 8px;font-size:16px;vertical-align:middle}
#dt td.in{padding:0}
#dt td.in input{border:0;border-radius:0;min-height:42px;padding:4px 8px;width:100%;min-width:70px;background:transparent}
#dt td.in input:focus{background:#fff8dc;color:#0b1f33}
#dt td.avg{background:var(--tint);font-weight:800;white-space:nowrap}
#dt td.x{width:44px;text-align:center;padding:0}
#dt td.x button{border:0;background:none;cursor:pointer;min-height:42px;min-width:42px;font-size:1.2rem;color:var(--bad)}
#dt td.flag{outline:3px solid var(--warn);outline-offset:-3px}
#dt tr.note td{background:var(--warntint);border-top:0}
#dt tr.note .btn{min-height:36px;padding:2px 10px;margin-left:8px}
.sw.sm{width:16px;height:16px;display:inline-block;vertical-align:-2px;margin-right:6px}
#graphBox svg,.miniGraph svg{width:100%;height:auto;display:block;background:#fff;border:3px solid var(--line);border-radius:10px;color:#0b1f33}
#graphBox svg{max-width:900px}
#specBox svg{width:100%;max-width:900px;height:auto;display:block;background:#fff;border:3px solid var(--line);border-radius:10px;margin-top:8px}
html[data-theme="dark"] #graphBox svg,html[data-theme="dark"] .miniGraph svg,html[data-theme="dark"] #specBox svg{filter:brightness(.92)}
.legend{display:flex;flex-wrap:wrap;gap:6px 16px;margin:6px 0;font-size:16px}
.legend span{display:flex;align-items:center;gap:6px}
.legend i{display:inline-block;width:26px;height:0;border-top:4px solid}
/* analysis questions */
.aq{border:2px solid var(--soft);border-radius:10px;padding:8px 12px;margin:8px 0}
.aq .q{font-weight:700}
.aqOpts{display:flex;flex-direction:column;gap:6px;margin:6px 0}
.aqOpts label{display:flex;gap:8px;align-items:flex-start;min-height:40px;cursor:pointer}
.aqOpts input{margin-top:2px;flex:0 0 auto}
.aqFb{font-weight:700;min-height:1.3em}
.aqFb.ok{color:var(--ok)}.aqFb.no{color:var(--bad)}
/* CER */
.starter{font-size:16px;color:var(--muted);background:var(--tint);border-left:4px solid var(--accent);padding:4px 8px;margin:4px 0}
.hideStarters .starter{display:none}
.evRef{display:grid;grid-template-columns:1fr 1fr;gap:10px}
@media(max-width:900px){.evRef{grid-template-columns:1fr}}
.miniTable{border-collapse:collapse;width:100%;font-size:16px}
.miniTable th,.miniTable td{border:1px solid var(--soft);padding:3px 6px;text-align:left}
.miniTable th{background:var(--thbg)}
/* tests */
.tHead{display:flex;justify-content:space-between;align-items:baseline;gap:10px;flex-wrap:wrap}
.tHead h2{margin:0}
.tQ{margin:10px 0;font-size:1.05rem}
.tChoices{display:flex;flex-direction:column;gap:8px;margin:8px 0;max-width:860px}
.tChoice{text-align:left;border:3px solid var(--line);border-radius:10px;background:var(--card);color:var(--ink);padding:10px 14px;min-height:48px;cursor:pointer;font:inherit;font-weight:600}
.tChoice:hover:not(:disabled){background:var(--hover)}
.tChoice[aria-checked=true]{border-color:var(--accent);background:var(--tint);box-shadow:0 0 0 2px var(--accent) inset}
.tChoice:disabled{cursor:not-allowed;opacity:.7}
.tWidget{max-width:900px;border:3px solid var(--line);border-radius:12px;overflow:hidden;margin:8px 0;background:#1b242e}
.tWidget canvas{display:block;width:100%;aspect-ratio:1000/600}
.tCtl{display:flex;flex-wrap:wrap;gap:8px;align-items:center;padding:8px 10px;background:var(--card);border-top:3px solid var(--line)}
.tCtl .seg button{min-height:44px}
.tCtl label{display:flex;gap:6px;align-items:center;font-weight:650}
.tCtl input[type=range]{width:200px;height:44px}
.tRead{font:700 1.05rem ui-monospace,Menlo,Consolas,monospace;padding:4px 10px;border:2px solid var(--line);border-radius:8px;background:#0b1f33;color:#7dffb1}
.tNav{justify-content:flex-end}
.tScore{display:flex;gap:16px;align-items:center;border:3px solid var(--ok);background:var(--oktint);border-radius:12px;padding:10px 16px;margin:10px 0;flex-wrap:wrap}
.tBig{font:800 2.2rem/1 ui-monospace,Menlo,Consolas,monospace;color:var(--ok)}
.tReview li{margin:10px 0}
.tReview li.no>b{color:var(--bad)}.tReview li.ok>b{color:var(--ok)}.tReview li.tg>b{color:var(--accent)}
.checks label{display:flex;gap:8px;align-items:flex-start;min-height:40px;font-weight:600}
.tgNote{border-left:4px solid var(--accent);background:var(--tint);padding:4px 10px;font-size:16px}
/* print */
@media print{
  html,body{background:#fff;color:#000}
  header#top,.noprint,#toast,.panel,.skip,.tlg-header,.tlg-footer{display:none!important}
  body[data-print=data] #tab-data,body[data-print=cer] #tab-cer{display:block!important}
  main{padding:0;max-width:none}
  .card{border:2px solid #000;break-inside:avoid;background:#fff;color:#000}
  .tableWrap{overflow:visible;border:0}
  table#dt{min-width:0}
  textarea{border:0!important;min-height:0;height:auto;overflow:visible}
  *{-webkit-print-color-adjust:exact;print-color-adjust:exact}
}
@media (prefers-reduced-motion:reduce){#toast{transition:none}}


/* ───────────── bench (new for this lab) ───────────── */
.benchWrap{grid-template-columns:minmax(0,1fr) 370px}
#cv{display:block;width:100%;aspect-ratio:1000/520;touch-action:none;cursor:default}
#cv.measuring{cursor:crosshair}
.stageBox{background:#0b1218}
.stageBox .pausedVeil{top:54px;font-size:16px;padding:5px 12px}
.zoomTag{position:absolute;left:50%;top:10px;transform:translateX(-50%);background:rgba(11,31,51,.86);color:#fff;padding:6px 14px;border-radius:10px;font-weight:800;font-size:16px;pointer-events:none;max-width:90%;text-align:center}
.slowTag{position:absolute;right:10px;bottom:64px;background:rgba(122,74,0,.88);color:#fff;padding:4px 10px;border-radius:8px;font-size:16px;font-weight:700;pointer-events:none}
.slowTag[hidden],.tipBox[hidden],.stepHint[hidden]{display:none!important}
.tipBox{position:absolute;z-index:6;max-width:min(92%,340px);background:var(--card);color:var(--ink);border:3px solid var(--line);border-radius:12px;padding:8px 12px;box-shadow:0 8px 24px rgba(0,0,0,.4);font-size:16px;pointer-events:none}
.tipBox b{display:block;font-size:17px}
.stepHint{position:absolute;left:50%;bottom:64px;transform:translateX(-50%);background:#ffb800;color:#0b1f33;border:2px solid #0b1f33;padding:6px 12px;border-radius:10px;font-weight:800;font-size:16px;display:flex;gap:10px;align-items:center;z-index:5}
.stepHint .btn{min-height:40px;padding:2px 12px;font-size:16px}
.zoomBar{display:flex;gap:10px;align-items:center;padding:4px 12px;background:#0b1f33;color:#fff}
.zoomBar .btn{min-width:44px;min-height:44px;font-size:22px;line-height:1;padding:0 8px;background:#fff;color:#0b1f33;border-width:2px}
.zoomTrack{flex:1}
.zoomTrack input[type=range]{width:100%;height:30px;accent-color:#ffb800;margin:0}
.zoomTicks{display:flex;justify-content:space-between;font-size:16px;color:#e6edf3;font-weight:700;padding:0 2px;line-height:1.1}
.stageNote{margin-top:8px;border-radius:10px;padding:6px 12px;background:#0b1f33;color:#e7eef5;font-size:16px;display:flex;flex-wrap:wrap;align-items:center;gap:4px 14px;min-height:44px}
.stageNote b{color:#ffd27a;font-variant-numeric:tabular-nums}
.stageNote .ratio{background:#ffd27a;color:#0b1f33;border-radius:8px;padding:0 8px;font-weight:800}
#graphPanel{margin-top:10px;padding:10px 12px}
.side .card{margin:0;padding:10px 12px}
.actBtns{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.actBtns .btn{min-height:50px;font-size:16px;padding:6px 8px}
.actBtns .btn.wide{grid-column:1/-1}
.actRead{font-size:16px;margin:.4em 0}
.actRead b{font-variant-numeric:tabular-nums}
.gasRow{display:flex;flex-wrap:wrap;gap:6px;margin:6px 0}
.gasRow .btn{min-height:44px;padding:4px 10px;font-size:16px}
.gasRow .btn[aria-pressed=true]{background:var(--accent);color:#fff}
.protPal{display:grid;grid-template-columns:1fr auto auto auto;gap:4px 8px;align-items:center;font-size:16px}
.protPal .btn{min-height:40px;min-width:40px;padding:0 8px;font-size:18px}
.protPal .n{font-weight:800;min-width:1.4em;text-align:center;font-variant-numeric:tabular-nums}
.concGrid{display:grid;grid-template-columns:auto 1fr 1fr;gap:4px 8px;align-items:center;font-size:16px}
.concGrid .h{font-weight:800;color:var(--muted)}
.concGrid input[type=range]{width:100%;height:36px;accent-color:var(--accent);margin:0}
.concGrid output{display:block;font:700 16px ui-monospace,Menlo,monospace;text-align:center}
.molIcon{width:22px;height:22px;vertical-align:-5px;margin-right:4px}
.chipBtn{border:2px solid var(--line);border-radius:18px;padding:4px 10px;background:var(--card);color:var(--ink);font:inherit;font-size:16px;font-weight:700;min-height:40px;cursor:pointer}
.chipBtn[aria-pressed=true]{background:var(--accent);color:#fff}
.chipRow{display:flex;flex-wrap:wrap;gap:6px}
.btnHi{animation:solHi 1.4s ease-in-out 2;border-radius:10px}
@keyframes solHi{0%,100%{box-shadow:0 0 0 0 rgba(255,184,0,0)}20%,60%{box-shadow:0 0 0 6px #ffb800}}
@media (prefers-reduced-motion:reduce){.btnHi{animation:none;outline:5px solid #ffb800;outline-offset:2px}}
.practice{display:flex;gap:10px;align-items:center;border:2px dashed var(--accent);border-radius:12px;padding:8px 12px;margin:10px 0;background:var(--tint)}
.practice b{display:block}
.practice a{font-weight:800}
.colorDot{display:inline-block;width:18px;height:18px;border-radius:50%;border:2px solid var(--line);vertical-align:-4px;margin-right:6px}
#dt select{border:0;min-height:42px;background:transparent;width:100%;min-width:9em;font-size:16px}
#dt td.typed,#dtSum td.typed{white-space:nowrap}#dt td.typed input,#dtSum td.typed input{width:6em}#dt td.typed .mk,#dtSum td.typed .mk{display:inline-block;width:1.2em;font-weight:800}
#dt td.typed.ok,#dtSum td.typed.ok{background:var(--oktint)}#dt td.typed.no,#dtSum td.typed.no{background:var(--badtint)}#dt td.ro{color:var(--muted)}
#dtSum td.in input{border:2px solid var(--soft);border-radius:6px;min-height:40px;padding:2px 6px}
#dt .mathMsg,#dtSum .mathMsg{max-width:22em;white-space:normal;margin-top:3px}
.calcGrid{display:grid;gap:6px;max-width:760px}
.calcRow{display:grid;grid-template-columns:1fr 9em 1.5em;gap:8px;align-items:center;border:2px solid var(--soft);border-radius:8px;padding:4px 8px}
.calcRow.ok{border-color:var(--ok);background:var(--oktint)}.calcRow.no{border-color:var(--bad);background:var(--badtint)}
.calcRow .mk{font-weight:800;font-size:1.2em}
.gasCh{list-style:none;margin:.3em 0;padding:0;display:grid;gap:8px}
.gasCh li{display:grid;grid-template-columns:1.6em 1fr;gap:4px;border:2px solid var(--soft);border-radius:10px;padding:6px 8px;font-size:16px}
.gasCh li.done{border-color:var(--ok);background:var(--oktint)}
.gasCh li .box{font-size:1.2em;font-weight:800}
.gasCh li .sub{display:block;color:var(--muted);font-size:16px}
.gasChBox>summary{cursor:pointer;min-height:32px;display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.nbPick{display:grid;gap:6px;max-height:50vh;overflow:auto}
.nbPick label{display:flex;gap:8px;align-items:flex-start;font-size:16px}
.tSimGraph svg{width:100%;height:auto}
.recipe li.bonus .txt{font-style:italic}
.pRow{margin:4px 0 8px}
.pTop{display:flex;justify-content:space-between;gap:8px;align-items:baseline}
.pLbl{font-weight:700}
.pVal{font:700 1rem ui-monospace,Menlo,Consolas,monospace;text-align:right}
.pRow input[type=range]{width:100%;height:40px;accent-color:var(--accent);margin:0}
.pBool{display:flex;gap:8px;align-items:center;font-weight:700;min-height:40px}
.side h3{margin:0 0 .35em;font-size:1.05rem}
.gasLegend .legend{display:flex;flex-wrap:wrap;gap:4px 16px;font-size:16px;margin-top:6px}
@media(max-width:1060px){.benchWrap{grid-template-columns:minmax(0,1fr)}.side{position:static;max-height:none;overflow:visible}}
@media print{.zoomBar,.stageNote,#benchBar{display:none!important}}
.tSpeed{display:inline-flex;gap:4px;align-items:center;font-weight:650}
.tSpeed .btn{min-height:44px;padding:4px 10px}
.tSpeed .btn[aria-pressed=true]{background:var(--accent);color:#fff;border-color:transparent}


/* ───────────── Gas Laws Lab additions ───────────── */
#cv{aspect-ratio:1000/560}
.actRow{display:flex;flex-wrap:wrap;gap:6px 10px;align-items:center;margin:4px 0 8px;font-weight:700}
.actRow select{min-height:42px}
.fillBox{border:2px solid var(--soft);border-radius:10px;padding:6px 8px;margin:8px 0;background:var(--tint)}
.fillBox>b{display:block;margin-bottom:4px}
.seg{display:flex;flex-wrap:wrap;gap:4px;align-items:center;margin:4px 0 8px}
.seg button[aria-pressed]{border:2px solid var(--line);border-radius:10px;background:var(--card);color:var(--ink);font:inherit;font-size:16px;font-weight:700;min-height:44px;padding:4px 10px;cursor:pointer}
.seg button[aria-pressed=true]{background:var(--accent);color:#fff;border-color:var(--accent)}
.seg button:disabled{opacity:.45;cursor:not-allowed}
.segLbl{font-weight:800;margin-right:4px}
.safety{background:var(--safety);border:2px solid #b45309;border-radius:12px;padding:8px 12px;margin:10px 0;font-size:16px}
.safety b{display:block}
.eq{font:700 1.05rem ui-monospace,Menlo,Consolas,monospace;background:var(--tint);border-radius:6px;padding:0 6px;white-space:nowrap}
.readGrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(8.5em,1fr));gap:6px;margin:6px 0}
.readGrid>div{border:2px solid var(--soft);border-radius:10px;padding:4px 8px;background:var(--tint)}
.readGrid .k{display:block;font-size:16px;color:var(--muted);font-weight:700}
.readGrid .v{display:block;font:800 1.25rem ui-monospace,Menlo,Consolas,monospace}
.readGrid .v small{font-size:16px;font-weight:700;color:var(--muted)}
.readGrid .covered .v{color:var(--muted);letter-spacing:.1em}
.stepper{display:flex;flex-wrap:wrap;gap:4px;align-items:center;margin:4px 0}
.stepper .btn{min-width:0;padding:4px 9px}
.fillBox .val{font:800 1.05rem ui-monospace,Menlo,Consolas,monospace;margin-left:6px}
.mystery{border:2px dashed var(--accent);border-radius:12px;padding:8px 10px;margin:8px 0;background:var(--tint)}
.mystery input{max-width:9em}
.histPanel svg{width:100%;height:auto}
#dt th{white-space:normal;min-width:6em}
#dt td.inv input{width:6.5em}
#dt td.inv .two{display:grid;grid-template-columns:auto auto;gap:4px 6px;align-items:center;font-size:16px}
#dt td select{min-width:8em}
.pausedVeil kbd{color:#0b1f33;background:#fff}
#slowTag{display:none!important}   /* the lens draws these notes on the canvas itself */
.warnBox{border:2px solid var(--bad);background:var(--badtint);border-radius:10px;padding:6px 10px;margin:6px 0;font-weight:700}