/* POISK Academia lab kit. Scoped to .lab; dark only, matching the site. */
.lab{--bg:#060914;--panel:#111a30;--panel-2:#0a0f20;--well:#070c1a;--line:rgba(112,138,184,.26);--line-strong:rgba(150,175,220,.42);
  --fg:#edf2ff;--muted:#a3b5d4;--dim:#7489ad;--accent:#b8c5ff;--accent-ink:#0d1430;--hot:#ffb26b;--cold:#63c7ff;--warm:#ff9a62;--ok:#8fe3b0;--warn:#ffd36b;--bad:#ff6b5a;
  --mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Consolas,monospace;color:var(--fg);display:grid;gap:18px;margin:0 0 30px}
.lab *{box-sizing:border-box}
.lab-grid{display:grid;grid-template-columns:minmax(0,1fr) 350px;gap:18px;align-items:start}
@media (max-width:980px){.lab-grid{grid-template-columns:minmax(0,1fr)}}
.lab-left{display:grid;gap:12px;min-width:0}
.lab-eyebrow{font:500 10.5px/1.4 var(--mono);letter-spacing:.18em;text-transform:uppercase;color:var(--accent)}
.lab button{cursor:pointer;border:1px solid rgba(120,150,200,.3);border-radius:10px;background:#1f2b48;color:#e4ecff;padding:9px 12px;font:500 12px/1.2 inherit;font-family:inherit}
.lab button:hover{background:#2d3d63}
.lab button:focus-visible,.lab input:focus-visible,.lab a:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
/* stage */
.lab-stage{position:relative;height:clamp(420px,66vh,680px);border:1px solid var(--line);border-radius:22px;overflow:hidden;background:radial-gradient(ellipse 70% 60% at 50% 45%,#1b2646 0%,#0c1328 60%,#070b18 100%)}
.lab-stage canvas{position:absolute;inset:0;width:100%;height:100%;display:block;touch-action:none;outline:none}
.lab-views{position:absolute;top:12px;left:12px;right:12px;display:flex;gap:6px;flex-wrap:wrap;z-index:3}
.lab-views button{background:rgba(14,22,44,.8);backdrop-filter:blur(6px)}
.lab-hint{position:absolute;left:16px;bottom:12px;font-size:11px;color:var(--dim);pointer-events:none;z-index:2}
.lab-loading{position:absolute;inset:0;display:grid;place-items:center;color:var(--muted);background:var(--well);z-index:5}
.lab-badge{position:absolute;right:14px;bottom:12px;z-index:3;font:500 11px/1 var(--mono);letter-spacing:.12em;text-transform:uppercase;padding:8px 11px;border-radius:8px;background:var(--well);border:1px solid var(--line-strong);color:var(--fg)}
.lab-badge[data-tone=hot]{background:var(--hot);color:#231303;border-color:transparent}.lab-badge[data-tone=cold]{background:var(--cold);color:#04162a;border-color:transparent}
.lab-badge[data-tone=ok]{background:var(--ok);color:#06200f;border-color:transparent}.lab-badge[data-tone=warn]{background:var(--warn);color:#1c1405;border-color:transparent}.lab-badge[data-tone=bad]{background:var(--bad);color:#2a0905;border-color:transparent}
.lab-fault-badge{position:absolute;top:58px;right:14px;z-index:3;font:500 11px/1.25 var(--mono);letter-spacing:.06em;padding:8px 11px;border-radius:8px;background:var(--bad);color:#2a0905;max-width:calc(100% - 28px)}
.lab-stage-card{position:absolute;left:14px;bottom:34px;z-index:3;max-width:min(360px,calc(100% - 28px));display:grid;gap:4px;padding:10px 12px;border-radius:12px;background:rgba(8,13,28,.9);border:1px solid var(--line-strong);font-size:12.5px;line-height:1.45;color:var(--muted)}
.lab-stage-card b{color:var(--fg);font-size:13px}
.lab-tags{position:absolute;inset:0;pointer-events:none;z-index:2}
.lab-tags svg{position:absolute;inset:0;width:100%;height:100%;overflow:visible}
.lab-tags line{stroke:rgba(200,215,255,.55);stroke-width:1}.lab-tags circle{fill:var(--fg)}
.lab .lab-tag{position:absolute;pointer-events:auto;transform:translate(-50%,-50%);white-space:nowrap;font:500 11px/1 inherit;color:var(--fg);background:rgba(10,16,34,.86);border:1px solid var(--line-strong);border-radius:999px;padding:6px 10px}
.lab .lab-tag:hover,.lab .lab-tag.on{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}
/* charts */
.lab-charts{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,300px),1fr));gap:12px}
.lab-charts:empty{display:none}
.lab-chart{margin:0;border:1px solid var(--line);border-radius:16px;background:var(--panel-2);padding:12px 12px 6px;min-width:0}
.lab-chart figcaption{display:flex;justify-content:space-between;align-items:baseline;gap:8px;flex-wrap:wrap;font-size:12.5px;font-weight:500;margin-bottom:4px}
.lab-chart figcaption small{font-weight:400;color:var(--dim);font-size:11px}
.lab-chart svg{width:100%;height:auto;display:block}
.lab-chart text{font:10px var(--mono);fill:var(--dim)}
.lab-chart .grid{stroke:rgba(140,165,210,.14)}.lab-chart .axis{stroke:rgba(140,165,210,.4)}
/* aside */
.lab-aside{background:linear-gradient(160deg,#16203c,#0b1022);border:1px solid var(--line);border-radius:22px;padding:20px;display:grid;gap:14px;min-width:0}
.lab-state{font-size:21px;font-weight:500;margin:6px 0 0;line-height:1.25;text-wrap:balance}
.lab-state-text{color:var(--muted);font-size:13.5px;line-height:1.55;margin:0;min-height:60px}
.lab-controls{display:grid;gap:14px}
.lab-field{display:grid;gap:8px}
.lab-field label,.lab-field-label{display:flex;justify-content:space-between;gap:10px;font-size:12px;color:var(--muted)}
.lab output{color:var(--fg);font:12px var(--mono);font-variant-numeric:tabular-nums}
.lab input[type=range]{width:100%;accent-color:var(--accent);margin:0}
.lab-seg{display:flex;flex-wrap:wrap;gap:4px;background:var(--well);padding:4px;border-radius:12px;border:1px solid var(--line)}
.lab .lab-seg button{flex:1 1 auto;border:0;background:transparent;padding:8px 8px;font-size:12px}
.lab .lab-seg button.on{background:var(--accent);color:var(--accent-ink)}
.lab-readouts{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px}
.lab-readouts:empty{display:none}
.lab-ro{--c:var(--accent);background:var(--well);border:1px solid var(--line);border-radius:12px;padding:10px 12px;display:grid;gap:6px;min-width:0}
.lab-ro small{font:500 9.5px/1.2 var(--mono);letter-spacing:.12em;color:var(--dim);text-transform:uppercase}
.lab-ro b{font:500 19px/1 var(--mono);font-variant-numeric:tabular-nums;color:var(--c)}
.lab-ro b em{font-style:normal;font-size:10px;color:var(--dim)}
.lab-ro i{display:block;height:3px;border-radius:2px;background:rgba(255,255,255,.08);overflow:hidden}
.lab-ro i span{display:block;height:100%;background:var(--c);transition:width .2s}
.lab-actions{display:flex;gap:8px;flex-wrap:wrap}
.lab .lab-primary{background:var(--hot);color:#231303;border-color:transparent}.lab .lab-primary:hover{background:#ffc68f}
.lab-toggles{display:grid;grid-template-columns:1fr 1fr;gap:8px 12px}
@media (max-width:520px){.lab-toggles{grid-template-columns:1fr}.lab-views button{padding:7px 9px;font-size:11px}}
.lab-check{display:flex;align-items:center;gap:8px;font-size:12.5px;color:var(--muted);cursor:pointer}
.lab-check-wide{color:var(--fg)}
.lab-check input{accent-color:var(--accent);width:15px;height:15px;margin:0}
.lab-note{font-size:11px;line-height:1.55;color:var(--dim);margin:0}
.lab-note:empty{display:none}
/* part card */
.lab-part{border:1px solid var(--line-strong);background:var(--panel-2);border-radius:14px;padding:14px;display:grid;gap:8px}
.lab-part-head{display:flex;justify-content:space-between;align-items:start;gap:10px}
.lab-part h3{margin:0;font-size:17px;font-weight:600}
.lab-cat{font:11px/1.4 var(--mono);color:var(--accent)}
.lab-part p{margin:0;font-size:13px;line-height:1.5;color:var(--muted)}
.lab-sym{border-top:1px solid var(--line);padding-top:8px;color:var(--fg)!important}.lab-sym b{color:var(--warn);font-weight:500}
.lab .lab-x{padding:4px 9px;font-size:14px;line-height:1}
.lab .lab-fault-link{justify-self:start;background:transparent;border-color:var(--bad);color:var(--bad);padding:7px 10px}
.lab .lab-fault-link:hover{background:rgba(255,107,90,.12)}
.lab-buy{display:grid;gap:6px}
.lab-buy-link{display:block;text-decoration:none;font-size:12.5px;font-weight:500;color:#231303;background:var(--hot);border-radius:10px;padding:9px 12px}
.lab-buy-link:hover{background:#ffc68f}
/* faults */
.lab-faults{border:1px solid var(--line);border-radius:18px;background:var(--panel-2);padding:16px;display:grid;gap:14px}
.lab-faults-head{display:flex;justify-content:space-between;align-items:end;gap:12px;flex-wrap:wrap}
.lab-faults h2{margin:6px 0 0;font-size:20px;font-weight:500}
.lab-fault-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}
@media (max-width:900px){.lab-fault-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:520px){.lab-fault-grid{grid-template-columns:minmax(0,1fr)}}
.lab .lab-fault-grid button{display:grid;gap:4px;text-align:left;padding:11px 12px;background:var(--well);border-color:var(--line);min-width:0}
.lab-fault-grid b{font-size:13px;font-weight:600}.lab-fault-grid span{font-size:11.5px;color:var(--dim)}
.lab .lab-fault-grid button.on{border-color:var(--bad);background:rgba(255,107,90,.12)}.lab-fault-grid button.on b{color:var(--bad)}
.lab-fault-detail{display:grid;gap:12px;border-top:1px solid var(--line);padding-top:14px}
.lab-fault-detail h3{margin:0;font-size:17px;color:var(--bad)}
.lab-fd-cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
@media (max-width:760px){.lab-fd-cols{grid-template-columns:minmax(0,1fr)}}
.lab-fd-cols div{display:grid;gap:4px;align-content:start;min-width:0}
.lab-fault-detail small{font:500 10px/1.3 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--dim)}
.lab-fault-detail p{margin:0;font-size:13px;line-height:1.55;color:var(--muted)}
.lab-fd-parts{display:grid;gap:6px}.lab-fd-parts div{display:flex;gap:6px;flex-wrap:wrap}
.lab-chip-wrap{display:inline-flex;gap:2px}
.lab .lab-chip{padding:6px 10px;border-radius:999px 0 0 999px;font-size:12px}
.lab .lab-chip:only-child{border-radius:999px}
.lab-chip-buy{display:inline-grid;place-items:center;padding:0 10px;border-radius:0 999px 999px 0;background:var(--hot);color:#231303;text-decoration:none;font-size:12px}
/* lesson */
.lab-lesson{display:grid;gap:18px;padding-top:28px}
.lab-lesson h2{font-size:clamp(22px,2.6vw,32px);font-weight:450;margin:0;text-wrap:balance}
.lab-lesson-intro{color:var(--muted);max-width:75ch;margin:0;line-height:1.6}
.lab-steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,230px),1fr));gap:14px;counter-reset:s}
.lab-steps article{border-top:1px solid var(--line-strong);padding-top:14px;display:grid;gap:8px;align-content:start;min-width:0}
.lab-steps article::before{counter-increment:s;content:"0" counter(s);font:500 12px/1 var(--mono);color:var(--hot)}
.lab-steps h3{margin:0;font-size:16px;font-weight:600}.lab-steps p{margin:0;color:var(--muted);font-size:14px;line-height:1.55}
.lab-try{border:1px solid var(--line);border-radius:16px;padding:16px 18px;background:var(--panel-2);display:grid;gap:8px}
.lab-try p{margin:0;color:var(--muted);max-width:80ch;line-height:1.55}
.lab details{border:1px solid var(--line);border-radius:14px;padding:12px 16px}
.lab summary{cursor:pointer;font-weight:500}
.lab details ul{margin:10px 0 0;padding-left:18px;color:var(--muted);display:grid;gap:6px}
body.embedded .lab-lesson{display:none}
@media (prefers-reduced-motion:reduce){.lab *{transition:none!important}}

/* Model-only widget. Text, SEO and purchase links belong to the host shop. */
body.compact-embed{margin:0}
body.compact-embed main{padding:8px;max-width:none}
body.compact-embed .seo-content,body.compact-embed .lab-directory{display:none!important}
.lab-compact{margin:0;gap:0}
.lab-compact .lab-grid{grid-template-columns:minmax(0,1fr) 250px;gap:10px}
.lab-compact .lab-stage{height:390px;border-radius:14px}
.lab-compact .lab-aside{padding:12px;border-radius:14px}
.lab-compact .lab-state{font-size:17px;line-height:1.25;margin:4px 0 12px}
.lab-compact .lab-state-text,.lab-compact .lab-note,.lab-compact .lab-charts,.lab-compact .lab-faults{display:none!important}
.lab-compact .lab-readouts{grid-template-columns:repeat(3,minmax(0,1fr));gap:6px}
.lab-compact .lab-ro{padding:8px}.lab-compact .lab-ro b{font-size:17px}
.lab-compact .lab-stage-card span{display:none}
.lab-compact .lab-views{top:8px;left:8px;right:8px;gap:4px}
.lab-compact .lab-views button{padding:7px 9px;font-size:11px}
.lab-compact .lab-part{padding:8px;margin:0 0 8px}
.lab-compact .lab-part-head h3{font-size:15px}
@media(max-width:720px){.lab-compact .lab-grid{grid-template-columns:minmax(0,1fr)}.lab-compact .lab-stage{height:320px}.lab-compact .lab-controls{display:grid;grid-template-columns:1fr 1fr;gap:12px}.lab-compact .lab-actions,.lab-compact .lab-toggles{display:flex;flex-wrap:wrap;gap:8px}.lab-compact .lab-aside{display:block}}

/* group overview pages (/node/<group>/) */
.lab-group-systems .subgroup-card .card-parts{color:#7f9ab3;font-size:12px;margin:-12px 0 20px;line-height:1.6}
.lab-group-systems .card-number{letter-spacing:.06em}
/* engine pages built from the mechanism template (/inline-four/, /inline-six/, /v8/) keep their header markup */
.lab-page header .header-note{font:10px monospace;letter-spacing:2px;color:#7992ac}
@media(max-width:640px){.lab-page header .header-note{display:none}}