.lab-hero{padding:8.5rem 0 3rem;background:radial-gradient(1200px 500px at 80% -10%,#FDE3D9 0,transparent 60%),linear-gradient(180deg,var(--sky-50),#fff)}
.lab-hero .lead{max-width:760px}
.lab-jump{display:flex;gap:.8rem;flex-wrap:wrap}
.lab-jump.center{justify-content:center}
.site-nav a[aria-current=page]{color:var(--orange-dark)}
.narrow{max-width:720px;margin:0 auto}
.lab-grid{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:1.25rem;align-items:stretch}
.stage{position:relative;min-height:560px;border-radius:var(--radius);overflow:hidden;background:radial-gradient(circle at 50% 35%,#fff 0,var(--sky-100) 70%);border:1px solid var(--line);box-shadow:var(--shadow);touch-action:none}
.stage-dark{background:radial-gradient(circle at 50% 35%,#1A4F75 0,#071F31 75%);border-color:#0B3A5B}
.stage canvas{position:absolute;inset:0;width:100%!important;height:100%!important;display:block;cursor:grab}
.stage canvas:active{cursor:grabbing}
.stage-badge{position:absolute;top:12px;left:12px;background:rgba(11,58,91,.88);color:#fff;font-size:.72rem;font-weight:600;letter-spacing:.04em;padding:.35rem .7rem;border-radius:999px;pointer-events:none}
.stage-hint{position:absolute;bottom:12px;left:50%;transform:translateX(-50%);font-size:.78rem;color:var(--muted);background:rgba(255,255,255,.8);padding:.3rem .7rem;border-radius:999px;pointer-events:none;white-space:nowrap}
.stage-dark .stage-hint{background:rgba(255,255,255,.12);color:#cfe3f1}
.stage-loading{position:absolute;inset:0;display:grid;place-items:center;color:var(--navy);font-weight:600;pointer-events:none}
.hotspots{position:absolute;inset:0;pointer-events:none}
.hotspot{position:absolute;width:22px;height:22px;margin:-11px 0 0 -11px;border-radius:50%;background:var(--orange);border:3px solid #fff;box-shadow:0 2px 8px rgba(0,0,0,.25);pointer-events:auto;cursor:pointer;padding:0;transition:transform .15s}
.hotspot:hover,.hotspot.active{transform:scale(1.25)}
.hotspot.hidden{display:none}
.part-card{position:absolute;right:12px;top:12px;max-width:280px;background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);padding:.8rem 1rem;font-size:.88rem;z-index:2}
.part-card h4{margin:0 0 .25rem;font-family:var(--font-head);color:var(--navy);font-size:1rem}
.part-card p{margin:.2rem 0;color:#2C4357}
.part-card .tag{display:inline-block;font-size:.7rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--orange-dark)}
.panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:1.1rem 1.2rem;display:flex;flex-direction:column;gap:.9rem}
.panel fieldset{border:0;margin:0;padding:0}
.panel legend{font-weight:600;color:var(--navy);font-size:.9rem;margin-bottom:.45rem;padding:0}
.seg{display:flex;flex-wrap:wrap;gap:.35rem}
.seg button{flex:1 1 auto;font:600 .82rem var(--font-body);padding:.5rem .7rem;border-radius:10px;border:1px solid var(--line);background:var(--sky-50);color:var(--navy);cursor:pointer}
.seg button[aria-pressed=true]{background:var(--navy);color:#fff;border-color:var(--navy)}
.swatches{display:flex;gap:.5rem}
.swatches button{width:34px;height:34px;border-radius:50%;background:var(--c);border:2px solid var(--line);cursor:pointer}
.swatches button[aria-pressed=true]{outline:3px solid var(--orange);outline-offset:2px}
.panel input[type=text],.panel #banner-text{width:100%;font:600 1rem var(--font-body);padding:.6rem .75rem;border:1px solid var(--line);border-radius:10px;text-transform:uppercase}
.panel input[type=range]{width:100%;accent-color:var(--orange)}
.panel output{float:right;color:var(--orange-dark)}
.toggles{display:flex;flex-direction:column;gap:.5rem}
.switch{display:flex;align-items:center;gap:.6rem;cursor:pointer;font-size:.92rem}
.switch input{position:absolute;opacity:0}
.switch span{width:38px;height:22px;border-radius:999px;background:#C9D6E0;position:relative;flex:none;transition:.2s}
.switch span:after{content:"";position:absolute;top:3px;left:3px;width:16px;height:16px;border-radius:50%;background:#fff;transition:.2s}
.switch input:checked+span{background:var(--orange)}
.switch input:checked+span:after{left:19px}
.switch input:focus-visible+span{outline:2px solid var(--navy);outline-offset:2px}
.lift{background:var(--sky-50);border:1px dashed var(--sky-600);border-radius:12px;padding:.8rem .9rem}
.lift p{margin:0}
.lift-label{font-size:.82rem;color:var(--muted)}
.lift-val{font:700 1.6rem var(--font-head);color:var(--navy)}
.tiny{font-size:.72rem;color:var(--muted);margin-top:.4rem!important}
.muted{color:var(--muted)}
.comp-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:.25rem;max-height:330px;overflow:auto}
.comp-list button{width:100%;text-align:left;font:500 .85rem var(--font-body);padding:.4rem .6rem;border-radius:8px;border:1px solid transparent;background:none;cursor:pointer;display:flex;gap:.5rem;align-items:center;color:var(--ink)}
.comp-list button:hover,.comp-list button.active{background:var(--sky-50);border-color:var(--line)}
.comp-list i{width:10px;height:10px;border-radius:3px;flex:none;background:var(--c)}
.diagram{margin-top:1.5rem;padding:1.4rem}
.diagram svg{width:100%;height:auto;display:block}
@media (max-width:980px){.lab-grid{grid-template-columns:1fr}.stage{min-height:420px}.comp-list{max-height:none;display:grid;grid-template-columns:1fr 1fr}}
@media (max-width:560px){.lab-hero{padding-top:7rem}.stage{min-height:360px}.part-card{left:12px;right:12px;top:auto;bottom:44px;max-width:none}.comp-list{grid-template-columns:1fr}.diagram{padding:.8rem}}
.stage-loading[hidden],.part-card[hidden]{display:none}
/* polish pass */
.stage-loading{flex-direction:column;gap:.7rem;background:rgba(241,249,254,.75);backdrop-filter:blur(3px);transition:opacity .35s;display:flex;align-items:center;justify-content:center}
.stage-loading.done{opacity:0}
.stage-loading[hidden]{display:none}
.spinner{width:34px;height:34px;border-radius:50%;border:3px solid #cfe3f1;border-top-color:var(--orange);animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.bar{width:160px;height:4px;border-radius:4px;background:#d6e6f1;overflow:hidden}
.bar i{display:block;height:100%;width:0;background:var(--orange);transition:width .2s}
.stage canvas{transition:opacity .35s}
.stage.is-loading canvas{opacity:.35}
.seg button:disabled{opacity:.55;cursor:wait}
.hotspot{transition:transform .15s,opacity .25s}
.hotspot.occluded{opacity:.12;pointer-events:none}
.demo-btn{align-self:flex-start}
.demo-btn[aria-pressed=true]{background:var(--navy);border-color:var(--navy);color:#fff}
.demo-pill{position:fixed;left:50%;bottom:18px;transform:translateX(-50%);z-index:60;background:rgba(11,58,91,.94);color:#fff;font-size:.85rem;font-weight:600;padding:.55rem .6rem .55rem 1rem;border-radius:999px;box-shadow:0 8px 24px rgba(0,0,0,.25);display:flex;align-items:center;gap:.5rem;white-space:nowrap}
.demo-pill[hidden]{display:none}
.demo-pill .dot{width:8px;height:8px;border-radius:50%;background:#FF8A66;animation:pulse 1.4s infinite}
@keyframes pulse{50%{opacity:.3}}
.demo-pill button{font:600 .8rem var(--font-body);background:#fff;color:var(--navy);border:0;border-radius:999px;padding:.3rem .8rem;cursor:pointer}
.demo-caption{position:absolute;left:12px;bottom:46px;background:rgba(255,255,255,.92);color:var(--navy);font-weight:600;font-size:.85rem;padding:.4rem .75rem;border-radius:10px;pointer-events:none;opacity:0;transition:opacity .3s}
.demo-caption.on{opacity:1}
.stage-dark .demo-caption{background:rgba(255,255,255,.14);color:#fff}
body.demo .stage-hint{opacity:0}
@media (hover:none){.hotspot{width:30px;height:30px;margin:-15px 0 0 -15px}}
@media (max-width:560px){
  .lab-hero h1{font-size:2.1rem}
  .stage{min-height:340px;height:62vw;max-height:440px}
  .seg button{font-size:.78rem;padding:.55rem .5rem}
  .stage-hint{font-size:.7rem}
  .stage-badge{font-size:.66rem}
  .demo-pill{font-size:.72rem;max-width:calc(100% - 20px)}
  .panel{padding:1rem}
}