/* Virtual lab layout */
.lab-shell{display:grid;grid-template-columns:270px 1fr;gap:16px;align-items:start}
.lab-side{position:sticky;top:76px;display:flex;flex-direction:column;gap:8px}
.lab-side .li{display:grid;grid-template-columns:34px 1fr;gap:10px;align-items:center;padding:8px 10px;border:1px solid var(--line);background:var(--card);border-radius:11px;cursor:pointer;text-align:left;font-size:.86rem}
.lab-side .li b{background:var(--blue);color:#fff;border-radius:8px;text-align:center;padding:3px 0;font-size:.95rem}
.lab-side .li small{display:block;color:var(--muted);font-size:.7rem}
.lab-side .li:hover{border-color:var(--accent)}
.lab-side .li.on{border-color:var(--crimson);box-shadow:0 0 0 2px rgba(212,38,79,.18)}
.lab-side .li.on b{background:var(--crimson)}
.lab-side .li .n{font-size:.68rem;color:var(--good);font-weight:700}
.lab-head{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-bottom:10px}
.lab-head h2{margin:0;flex:1;min-width:240px;font-size:1.35rem}
.lab-tabs{display:flex;gap:4px;flex-wrap:wrap;border-bottom:2px solid var(--line);margin-bottom:12px}
.lab-tabs button{border:0;background:none;padding:.55em 1em;cursor:pointer;font-weight:700;color:var(--muted);border-bottom:3px solid transparent;margin-bottom:-2px;font-size:.92rem}
.lab-tabs button.on{color:var(--crimson);border-color:var(--crimson)}
.lab-pane{display:none}.lab-pane.on{display:block}
.lab-bench{height:min(640px,calc(100vh - 250px));min-height:470px}
.lab-bench .wg{height:100%}
.lab-bench .rec{display:flex;gap:8px;flex-wrap:wrap}
.lab-brief ol,.lab-brief ul{margin:.3em 0 .8em 1.2em;padding:0}
.lab-brief li{margin:.25em 0}
.lab-brief .spec{border-left:5px solid var(--crimson);background:var(--soft);border-radius:0 10px 10px 0;padding:.6em 1em;margin:.8em 0}
.lab-brief .eqn{font-family:Georgia,serif;font-style:italic;background:var(--soft);padding:.15em .5em;border-radius:6px}
.lab-data{overflow:auto;max-height:340px;border:1px solid var(--line);border-radius:10px}
.lab-data table{margin:0}
.lab-data td.x{width:30px;text-align:center;cursor:pointer;color:var(--crimson);font-weight:700}
.lab-an{display:grid;grid-template-columns:minmax(260px,1fr) minmax(300px,1.3fr);gap:14px;margin-top:14px}
.pl{margin-top:14px;height:340px;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:6px;display:flex;flex-direction:column}
.lab-q{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:.8rem 1rem;margin-bottom:12px}
.lab-q textarea{width:100%;min-height:90px;border-radius:8px;border:1px solid var(--line);background:var(--bg);color:var(--ink);font:inherit;padding:.5em .7em;margin-top:.4rem;resize:vertical}
.lab-q details{margin-top:.4rem;color:var(--muted);font-size:.88rem}
.lab-q .qn{display:inline-block;background:var(--blue);color:#fff;border-radius:6px;padding:0 .5em;font-weight:700;margin-right:.4em}
.lab-who{display:flex;gap:10px;flex-wrap:wrap}
.lab-who input{padding:.4em .7em;border-radius:8px;border:1px solid var(--line);background:var(--card);color:var(--ink);font:inherit;min-width:180px}
.swatch{display:inline-block;width:46px;height:22px;border-radius:5px;border:1px solid var(--line);vertical-align:middle}
.pass{color:var(--good);font-weight:700}.fail{color:var(--crimson);font-weight:700}
#report{display:none}
#report.on{display:block;background:#fff;color:#111;padding:28px 34px;border-radius:12px;border:1px solid var(--line)}
#report h1{font-size:1.5rem}#report h2{font-size:1.15rem;margin-top:1.4em;border-bottom:2px solid #2f529e;padding-bottom:.2em}
#report table{border-collapse:collapse;font-size:.82rem;margin:.4em 0}
#report th,#report td{border:1px solid #bbb;padding:.2em .5em}
#report .ans{white-space:pre-wrap;background:#f4f4f0;padding:.5em .7em;border-radius:6px;font-size:.88rem}
#report .rh{display:flex;gap:16px;align-items:center}#report .rh img{width:80px}
@media (max-width:900px){.lab-shell{grid-template-columns:1fr}.lab-side{position:static;flex-direction:row;overflow:auto}.lab-side .li{min-width:200px}.lab-an{grid-template-columns:1fr}}
@media print{.topbar,.noprint,footer.site{display:none!important}body{background:#fff}.wrap{padding:0}}
.hero .btn{color:var(--ink);background:#fff}.hero .btn:hover{background:#f0f0f0}
.lab-an .pl{margin-top:0}