/* Standalone, browser-local educational labs. Deliberately scoped to .lab-shell. */
.lab-shell{--lab-bg:#101f2c;--lab-surface:#122637;--lab-line:#315064;--lab-text:#edf5fa;--lab-muted:#afc0cb;--lab-green:#5ee4af;--lab-amber:#f5c36b;--lab-red:#ff8b89;--lab-blue:#91c9ff;color:var(--lab-text);max-width:1160px;margin:0 auto;padding:0 16px 80px;line-height:1.55}
.lab-shell *{box-sizing:border-box}.lab-shell a{color:var(--lab-blue)}
.lab-shell .lab-intro{padding:38px 0 22px}.lab-shell .lab-kicker{display:inline-block;text-transform:uppercase;letter-spacing:.12em;color:var(--lab-green);font-weight:750;font-size:.76rem}.lab-shell h1{font-size:clamp(2.1rem,5vw,3.6rem);line-height:1.1;letter-spacing:-.03em;margin:.5rem 0 1rem}.lab-shell h2{font-size:clamp(1.35rem,3vw,1.7rem);margin:0 0 .6rem}.lab-shell h3{font-size:1.04rem;margin:0 0 .55rem}.lab-shell p{margin:.45rem 0 1rem}
.lab-shell .lab-lede{font-size:1.1rem;color:var(--lab-muted);max-width:75ch}
.lab-shell .lab-tagline{border-left:3px solid var(--lab-green);background:rgba(83,211,167,.075);padding:13px 16px;margin:12px 0 20px;color:var(--lab-muted)}
.lab-shell .lab-tagline strong{color:var(--lab-text)}
.lab-shell .lab-series{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0 26px}.lab-shell .lab-series a{display:inline-flex;align-items:center;border:1px solid var(--lab-line);background:rgba(14,31,43,.6);color:#c4dae7;border-radius:100px;text-decoration:none;padding:8px 12px;font-size:.82rem}.lab-shell .lab-series a[aria-current=page]{background:rgba(83,211,167,.13);border-color:var(--lab-green);color:#c7ffe8;font-weight:700}
.lab-shell .lab-panel{background:linear-gradient(145deg,rgba(22,43,60,.97),rgba(11,24,36,.97));border:1px solid var(--lab-line);border-radius:16px;padding:clamp(15px,2.6vw,26px);margin:16px 0;min-width:0}
.lab-shell .lab-row{display:flex;flex-wrap:wrap;gap:12px;align-items:center}.lab-shell .lab-spread{justify-content:space-between}.lab-shell .lab-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.lab-shell .lab-grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.lab-shell .lab-muted{color:var(--lab-muted)}.lab-shell .lab-small{font-size:.84rem}.lab-shell .lab-stat{background:#0b1825;border:1px solid #2a475a;padding:14px;border-radius:12px}.lab-shell .lab-stat strong{font-size:1.45rem;display:block;line-height:1.3;margin:.3rem 0;font-variant-numeric:tabular-nums}.lab-shell .lab-stat span{font-size:.79rem;color:var(--lab-muted)}
.lab-shell button,.lab-shell select,.lab-shell input{font:inherit}.lab-shell button{cursor:pointer}.lab-shell button:focus-visible,.lab-shell a:focus-visible,.lab-shell input:focus-visible,.lab-shell select:focus-visible{outline:3px solid var(--lab-blue);outline-offset:3px}
.lab-shell .lab-button{padding:10px 14px;background:#1a3345;color:#e6f4ff;border:1px solid #54748a;border-radius:10px;font-size:.91rem;min-height:44px;line-height:1.3}.lab-shell .lab-button:hover{border-color:var(--lab-blue);background:#234458}.lab-shell .lab-button[aria-pressed=true]{background:rgba(83,211,167,.16);border-color:var(--lab-green);color:#c8ffe3}
.lab-shell .lab-controls{display:flex;flex-wrap:wrap;gap:9px;margin:15px 0}.lab-shell .lab-flow{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:9px;position:relative;margin:20px 0}.lab-shell .lab-node{padding:15px 10px;background:#0d2030;border:1px solid #395b70;border-radius:13px;min-width:0;min-height:145px;text-align:left;display:flex;flex-direction:column;gap:8px;color:var(--lab-text)}
.lab-shell button.lab-node:hover{border-color:var(--lab-blue)}.lab-shell .lab-node .lab-number{font-size:.72rem;text-transform:uppercase;letter-spacing:.08em;color:var(--lab-muted);font-weight:700}.lab-shell .lab-node strong{font-size:.93rem;line-height:1.28}.lab-shell .lab-node .lab-status{font-size:.72rem;font-weight:700;line-height:1.4;margin-top:auto}.lab-shell .lab-node[data-selected=true]{outline:2px solid var(--lab-blue);outline-offset:2px}.lab-shell .lab-node[data-state=caught]{border-color:var(--lab-amber);background:rgba(245,195,107,.09)}.lab-shell .lab-node[data-state=missed],.lab-shell .lab-node[data-state=exposed]{border-color:var(--lab-red);background:rgba(255,139,137,.07)}.lab-shell .lab-node[data-state=skipped]{opacity:.6}.lab-shell .lab-node[data-state=normal]{border-color:var(--lab-green)}
.lab-shell .lab-inspector{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:14px}.lab-shell .lab-datum{padding:12px;background:#081622;border:1px solid #274456;border-radius:11px;min-width:0}.lab-shell .lab-datum label{display:block;font-size:.78rem;color:var(--lab-muted);margin-bottom:5px}.lab-shell code,.lab-shell pre{font-family:ui-monospace,SFMono-Regular,Consolas,monospace}.lab-shell pre{font-size:.78rem;white-space:pre-wrap;overflow-wrap:anywhere;background:#081420;color:#c9e9ff;padding:13px;border:1px solid #294458;border-radius:10px;max-height:350px;overflow:auto}.lab-shell .lab-outcome{padding:14px;border:1px solid var(--lab-green);background:rgba(94,228,175,.07);border-radius:12px;margin:14px 0}.lab-shell .lab-outcome[data-state=breach]{border-color:var(--lab-red);background:rgba(255,139,137,.09)}.lab-shell .lab-outcome[data-state=caught]{border-color:var(--lab-amber);background:rgba(245,195,107,.08)}
.lab-shell .lab-toggle{display:flex;gap:7px;align-items:center;justify-content:center;border-top:1px solid var(--lab-line);padding:9px 0 0;margin-top:auto;font-size:.8rem;color:#cde0ed}.lab-shell .lab-toggle input{width:18px;height:18px;accent-color:var(--lab-green)}
.lab-shell .lab-table-wrap{overflow-x:auto}.lab-shell table{width:100%;border-collapse:collapse;min-width:520px}.lab-shell th,.lab-shell td{text-align:left;border-bottom:1px solid #315064;padding:10px 8px;font-size:.89rem}.lab-shell th{font-size:.76rem;text-transform:uppercase;letter-spacing:.07em;color:var(--lab-muted)}
.lab-shell .lab-field{display:block;margin-bottom:17px}.lab-shell .lab-field .lab-label{display:flex;justify-content:space-between;gap:12px;font-weight:650;font-size:.91rem}.lab-shell .lab-field input[type=range]{display:block;width:100%;margin:12px 0 2px;accent-color:var(--lab-green)}.lab-shell .lab-field output{color:var(--lab-green);font-variant-numeric:tabular-nums}.lab-shell .lab-field .lab-hint{font-size:.79rem;color:var(--lab-muted)}
.lab-shell .lab-bars{display:grid;gap:10px}.lab-shell .lab-bar-name{display:flex;justify-content:space-between;align-items:center;gap:10px;font-size:.87rem}.lab-shell .lab-track{height:16px;overflow:hidden;border-radius:100px;background:#0c1c29;border:1px solid #315064;display:flex}.lab-shell .lab-fill{height:100%;transition:width .15s;min-width:0;background:#5ee4af}.lab-shell .lab-fill[data-kind=baseline]{background:#ea9d71}.lab-shell .lab-fill[data-kind=commit]{background:#8fd1ff}.lab-shell .lab-fill[data-kind=pr]{background:#baadf5}.lab-shell .lab-fill[data-kind=nightly]{background:#5ee4af}
.lab-shell .lab-check{display:inline-flex;align-items:center;gap:8px;min-height:44px}.lab-shell .lab-check input{width:19px;height:19px;accent-color:var(--lab-green)}
.lab-shell .lab-note{border:1px solid #406070;border-radius:12px;background:#0c2130;padding:14px;color:var(--lab-muted);font-size:.86rem}
.lab-shell .lab-lesson{padding:12px 14px;border-left:3px solid var(--lab-blue);color:#d7e9f4;background:rgba(145,201,255,.07)}.lab-shell .lab-good{color:var(--lab-green)}.lab-shell .lab-warn{color:var(--lab-amber)}.lab-shell .lab-danger{color:var(--lab-red)}
.lab-shell .lab-footer-next{padding:24px 0 0;border-top:1px solid var(--lab-line);margin-top:38px}.lab-shell .lab-footer-next a{font-weight:750}
@media(max-width:900px){.lab-shell .lab-flow{grid-template-columns:repeat(3,minmax(0,1fr))}.lab-shell .lab-grid-3{grid-template-columns:1fr 1fr}}
@media(max-width:680px){.lab-shell .lab-grid,.lab-shell .lab-grid-3,.lab-shell .lab-inspector{grid-template-columns:1fr}.lab-shell .lab-flow{grid-template-columns:1fr}.lab-shell .lab-node{min-height:0}.lab-shell .lab-node .lab-status{margin-top:3px}.lab-shell .lab-row.lab-spread{align-items:flex-start}.lab-shell .lab-intro{padding-top:22px}}
@media(prefers-reduced-motion:reduce){.lab-shell .lab-fill{transition:none}}