.lab-theme{--lab-bg: var(--rx-lab-bg, #080D18);--lab-shell: var(--rx-lab-shell, #0D1424);--lab-surface: var(--rx-lab-surface, #121A2B);--lab-surface-2: var(--rx-lab-surface-2, #182238);--lab-bg-deep: var(--rx-lab-bg-deep, #050A14);--lab-border: var(--rx-lab-border, #2B3A57);--lab-border-strong: var(--rx-lab-border-strong, #3F5277);--lab-text: var(--rx-lab-text, #EAF1FF);--lab-text-soft: var(--rx-lab-text-soft, #B8C6E3);--lab-text-muted: var(--rx-lab-muted, #8390AD);--lab-primary: var(--rx-primary, #60A5FA);--lab-cyan: #22D3EE;--lab-voltage: #F59E0B;--lab-resistance: #A78BFA;--lab-success: #34D399;--lab-danger: #F87171}.lab-workbench{--lab-bg: var(--rx-lab-bg, #0B1220);--lab-bg-deep: var(--rx-lab-bg-deep, #050A14);--lab-surface: var(--rx-lab-surface, #111827);--lab-surface-2: var(--rx-lab-surface-2, #172033);--lab-surface-3: var(--rx-lab-surface-3, #1D263A);--lab-border: var(--rx-lab-border, #2E3A52);--lab-border-strong: var(--rx-lab-border-strong, #3B4A6A);--lab-text: var(--rx-lab-text, #E7ECF7);--lab-text-soft: var(--rx-lab-text-soft, #CBD5E1);--lab-text-muted: var(--rx-lab-muted, #94A3B8);--lab-primary: var(--rx-primary, #60A5FA);--lab-cyan: #22D3EE;--lab-signal: #14B8A6;--lab-voltage: #F59E0B;--lab-current: #38BDF8;--lab-resistance: #A78BFA;--lab-success: #34D399;--lab-warning: #FBBF24;--lab-danger: #F87171;--lab-violet: #A78BFA;--lab-glow-blue: rgba(96, 165, 250, .22);--lab-glow-cyan: rgba(34, 211, 238, .22);--lab-glow-amber: rgba(245, 158, 11, .24);--lab-shadow: 0 18px 48px rgba(0, 0, 0, .4);--app-bg: var(--lab-bg);--app-panel: var(--lab-surface);--app-panel-alt: var(--lab-surface-2);--app-border: var(--lab-border);--app-accent: var(--lab-resistance);--app-accent-soft: var(--lab-primary);--app-cyan: var(--lab-cyan);--app-green: var(--lab-success);--app-yellow: var(--lab-warning);--app-purple: var(--lab-resistance);--app-orange: var(--lab-voltage);--app-text: var(--lab-text);--app-muted: var(--lab-text-muted);--app-soft: var(--lab-text-soft);background:var(--lab-bg);color:var(--lab-text);min-height:100vh;overflow-y:auto;font-family:var(--app-font-sans)}.lab-shell-page{border:1px solid color-mix(in srgb,var(--lab-border) 76%,transparent);border-radius:.75rem;box-shadow:0 24px 56px #02081785,inset 0 1px #7fb7ff24}.lab-shell-wrap{width:min(110rem,calc(100% - 2rem));margin:1rem auto;overflow:hidden;background:color-mix(in srgb,var(--lab-bg) 94%,black)}.lab-shell-back{margin:.9rem 1.1rem 0;display:inline-flex;align-items:center;border:1px solid transparent;border-radius:.375rem;padding:.35rem .65rem;font-size:.8rem;font-weight:700;color:var(--lab-text-muted);background:transparent;cursor:pointer;transition:color .14s ease,border-color .14s ease,background-color .14s ease}.lab-shell-back:hover{color:var(--lab-cyan);border-color:color-mix(in srgb,var(--lab-cyan) 40%,var(--lab-border));background:color-mix(in srgb,var(--lab-cyan) 8%,transparent)}.lab-shell-header{padding:.35rem 1.25rem .9rem;border-bottom:1px solid var(--lab-border)}.lab-shell-meta-row{display:flex;flex-wrap:wrap;align-items:center;gap:.45rem}.lab-shell-type{font-size:.68rem;font-weight:800;letter-spacing:.18em;text-transform:uppercase;color:var(--lab-text-muted)}.lab-shell-title{margin:.5rem 0 0;font-size:clamp(1.45rem,2.1vw,2rem);font-weight:800;color:var(--lab-text);letter-spacing:-.015em}.lab-shell-description{margin:.5rem 0 0;max-width:72ch;color:var(--lab-text-muted);font-size:.9rem;line-height:1.55}.lab-shell-simulation{background:var(--lab-bg);border-top:1px solid var(--lab-border);border-bottom:1px solid var(--lab-border);padding:0}.lab-shell-simulation-inner{width:100%;min-height:min(72vh,860px);background:linear-gradient(rgba(96,165,250,.028) 1px,transparent 1px),linear-gradient(90deg,rgba(96,165,250,.028) 1px,transparent 1px),var(--lab-bg-deep);background-size:28px 28px,28px 28px,auto}.lab-shell-related{margin-top:0;padding:1rem 1.25rem 1.1rem;border-top:1px solid var(--lab-border);background:color-mix(in srgb,var(--lab-surface) 92%,transparent)}.lab-shell-panel{background:var(--app-panel-alt);box-shadow:inset 0 1px #7fb7ff14}.lab-shell-chip{background:var(--app-panel-alt)!important;border-color:var(--app-border)!important;color:var(--app-muted)!important}.lab-shell-link{background:var(--app-panel-alt)!important;border-color:var(--app-border)!important;color:var(--app-text)!important}.lab-shell-link:hover{border-color:color-mix(in srgb,var(--lab-cyan) 50%,var(--app-border))!important;box-shadow:0 0 0 1px color-mix(in srgb,var(--lab-cyan) 16%,transparent),0 8px 20px #040f2866}.lab-header{display:flex;align-items:center;gap:.75rem;padding:.65rem 1.25rem;border-bottom:1px solid var(--lab-border);background:color-mix(in srgb,var(--lab-surface) 96%,transparent);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);position:sticky;top:0;z-index:40}.lab-brand{display:inline-flex;align-items:center;gap:.5rem;font-weight:800;font-size:1rem;color:var(--lab-text);text-decoration:none;flex-shrink:0}.lab-brand-icon{width:1.6rem;height:1.6rem}.lab-header-divider{width:1px;height:1.25rem;background:var(--lab-border-strong);flex-shrink:0}.lab-title{font-size:1rem;font-weight:700;color:var(--lab-text);margin:0;flex-shrink:0}.lab-header-meta{display:flex;align-items:center;gap:1rem;margin-left:auto;flex-wrap:wrap}.lab-meta-item{display:inline-flex;align-items:center;gap:.35rem;font-size:.78rem;font-weight:600}.lab-meta-item svg{width:.9rem;height:.9rem;flex-shrink:0}.lab-badge{display:inline-flex;align-items:center;gap:.25rem;padding:.2rem .55rem;border-radius:.25rem;font-size:.7rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;border:1px solid transparent}.lab-badge-stem{background:#34d39926;border-color:#34d39959;color:var(--lab-success)}.lab-badge-amber{background:var(--lab-glow-amber);border-color:#f59e0b59;color:var(--lab-voltage)}.lab-badge-blue{background:var(--lab-glow-blue);border-color:#60a5fa59;color:var(--lab-primary)}.lab-badge-violet{background:#a78bfa26;border-color:#a78bfa59;color:var(--lab-violet)}.lab-objectives-strip{display:flex;align-items:flex-start;gap:1rem;padding:.7rem 1.25rem;border-bottom:1px solid var(--lab-border);background:var(--lab-surface);flex-wrap:wrap}.lab-objectives-label{display:inline-flex;align-items:center;gap:.4rem;font-size:.68rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--lab-primary);flex-shrink:0;margin-top:.05rem}.lab-objectives-list{display:flex;flex-wrap:wrap;gap:.5rem 1.25rem;flex:1;min-width:0}.lab-objective-item{display:inline-flex;align-items:flex-start;gap:.4rem;font-size:.8rem;color:var(--lab-text-soft)}.lab-objective-check{color:var(--lab-success);flex-shrink:0;margin-top:.05rem}.lab-standards-chips{display:inline-flex;align-items:center;gap:.4rem;flex-shrink:0;margin-left:auto}.lab-main-grid{display:grid;grid-template-columns:280px minmax(0,1fr) 280px;gap:0;flex:1;min-height:0;overflow:hidden;align-items:stretch}.lab-column-left{border-right:1px solid var(--lab-border);background:var(--lab-surface);display:flex;flex-direction:column;gap:0;overflow-y:auto;height:100%}.lab-column-center{background:var(--lab-bg);display:flex;flex-direction:column;min-height:0;height:100%;overflow:hidden}.lab-column-right{border-left:1px solid var(--lab-border);background:var(--lab-surface);display:flex;flex-direction:column;overflow-y:auto;height:100%}.lab-section-header{display:flex;align-items:center;gap:.5rem;padding:.7rem 1rem .55rem;border-bottom:1px solid var(--lab-border)}.lab-section-kicker{font-size:.66rem;font-weight:800;letter-spacing:.14em;text-transform:uppercase;color:var(--lab-text-muted);margin:0}.lab-section-kicker svg{width:.85rem;height:.85rem;display:inline-block;vertical-align:middle;margin-right:.3rem}.lab-panel{padding:.9rem 1rem;border-bottom:1px solid var(--lab-border)}.lab-panel-title{margin:0 0 .35rem;font-size:1.1rem;font-weight:700;color:var(--lab-text)}.lab-panel-description{font-size:.82rem;line-height:1.55;color:var(--lab-text-muted);margin:0}.lab-theory-card{margin:.75rem 1rem;border:1px solid rgba(245,158,11,.3);border-radius:.375rem;background:#f59e0b12;padding:.75rem}.lab-theory-header{display:flex;align-items:center;gap:.4rem;font-size:.68rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--lab-voltage);margin-bottom:.6rem}.lab-formula-row{font-size:.82rem;color:var(--lab-voltage);font-family:ui-monospace,monospace;line-height:1.7;margin:0}.lab-theory-note{font-size:.78rem;color:var(--lab-text-soft);margin:.5rem 0 0;line-height:1.5}.lab-theory-note strong{color:var(--lab-voltage)}.lab-help-card{margin:.75rem 1rem;border:1px solid var(--lab-border);border-radius:.375rem;background:var(--lab-surface-2)}.lab-help-header{display:flex;align-items:center;gap:.4rem;font-size:.68rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--lab-text-muted);padding:.55rem .75rem;border-bottom:1px solid var(--lab-border)}.lab-help-body{padding:.65rem .75rem;font-size:.78rem;color:var(--lab-text-muted);line-height:1.5}.lab-help-link{display:inline-flex;align-items:center;gap:.3rem;font-size:.78rem;font-weight:600;color:var(--lab-primary);margin-top:.4rem;background:none;border:none;cursor:pointer;padding:0;text-decoration:none}.lab-help-link:hover{color:var(--lab-cyan)}.lab-stage{flex:1;display:flex;flex-direction:column;overflow:hidden;position:relative;min-height:0}.lab-stage-frame{flex:1;min-height:320px;position:relative;background:linear-gradient(rgba(96,165,250,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(96,165,250,.035) 1px,transparent 1px),var(--lab-bg-deep);background-size:32px 32px,32px 32px,auto;overflow:hidden}.lab-stage-inner-shadow{position:absolute;top:0;right:0;bottom:0;left:0;box-shadow:inset 0 0 60px #00000080;pointer-events:none;z-index:1}.lab-stage-canvas-container{position:absolute;top:0;right:0;bottom:0;left:0;z-index:0}.lab-stage-toolbar{position:absolute;top:.65rem;left:.65rem;display:flex;flex-direction:column;gap:.3rem;z-index:10}.lab-stage-tool-btn{width:2rem;height:2rem;border-radius:.375rem;border:1px solid var(--lab-border-strong);background:#111827d9;color:var(--lab-text-muted);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .15s ease;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.lab-stage-tool-btn:hover,.lab-stage-tool-btn.is-active{background:#60a5fa2e;border-color:var(--lab-primary);color:var(--lab-primary)}.lab-stage-tool-btn:focus-visible{outline:2px solid var(--lab-primary);outline-offset:2px}.lab-readout-strip{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border-top:1px solid var(--lab-border);background:var(--lab-surface)}.lab-readout-cell{padding:.6rem 1rem;border-right:1px solid var(--lab-border);text-align:center}.lab-readout-cell:last-child{border-right:none}.lab-readout-label{font-size:.62rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--lab-text-muted);margin:0}.lab-readout-value{font-size:1rem;font-weight:800;font-variant-numeric:tabular-nums;color:var(--lab-text);margin:.1rem 0 0;line-height:1.2}.lab-readout-value.is-voltage{color:var(--lab-voltage)}.lab-readout-value.is-current{color:var(--lab-current)}.lab-readout-value.is-resistance{color:var(--lab-resistance)}.lab-action-bar{display:flex;flex-wrap:wrap;align-items:center;gap:.4rem .75rem;padding:.55rem .9rem;border-top:1px solid var(--lab-border);background:var(--lab-surface)}.lab-action-hint{font-size:.72rem;color:var(--lab-text-muted);flex:1;min-width:0}.lab-action-hint kbd{display:inline-block;padding:.05rem .3rem;border:1px solid var(--lab-border-strong);border-radius:.2rem;background:var(--lab-surface-2);font-size:.68rem;font-family:ui-monospace,monospace;color:var(--lab-text-soft)}.lab-btn{display:inline-flex;align-items:center;justify-content:center;gap:.3rem;padding:.35rem .8rem;border-radius:.375rem;border:1px solid var(--lab-border-strong);background:var(--lab-surface-2);color:var(--lab-text-soft);font-size:.78rem;font-weight:600;cursor:pointer;transition:all .15s ease;white-space:nowrap}.lab-btn:hover{border-color:var(--lab-primary);color:var(--lab-primary);background:#60a5fa1a}.lab-btn:focus-visible{outline:2px solid var(--lab-primary);outline-offset:2px}.lab-btn:disabled{opacity:.4;cursor:not-allowed}.lab-btn-primary{border-color:#60a5fa80;background:#60a5fa26;color:var(--lab-primary)}.lab-btn-primary:hover{background:#60a5fa40;box-shadow:0 0 12px var(--lab-glow-blue)}.lab-control-group{padding:.8rem 1rem;border-bottom:1px solid var(--lab-border);display:flex;flex-direction:column;gap:.75rem}.lab-control-label{font-size:.72rem;font-weight:700;letter-spacing:.05em;color:var(--lab-text-muted);margin:0 0 .3rem;display:block}.lab-segmented{display:flex;border:1px solid var(--lab-border-strong);border-radius:.375rem;overflow:hidden;width:100%}.lab-segmented-btn{flex:1;padding:.38rem .5rem;font-size:.78rem;font-weight:600;color:var(--lab-text-muted);background:transparent;border:none;cursor:pointer;transition:all .15s;border-right:1px solid var(--lab-border-strong);text-align:center}.lab-segmented-btn:last-child{border-right:none}.lab-segmented-btn.is-active{background:var(--lab-primary);color:#fff}.lab-segmented-btn:not(.is-active):hover{background:#60a5fa1a;color:var(--lab-primary)}.lab-segmented-btn:focus-visible{outline:2px solid var(--lab-primary);outline-offset:-2px}.lab-input{width:100%;padding:.4rem .65rem;border:1px solid var(--lab-border-strong);border-radius:.375rem;background:var(--lab-bg);color:var(--lab-text);font-size:.84rem;transition:border-color .15s}.lab-input:focus{outline:none;border-color:var(--lab-primary);box-shadow:0 0 0 2px var(--lab-glow-blue)}.lab-input-group{display:flex;flex-direction:column;gap:.25rem}.lab-slider-row{display:grid;grid-template-columns:1rem 1fr 1rem;align-items:center;gap:.5rem}.lab-slider-icon{font-size:.8rem;color:var(--lab-text-muted);line-height:1}.lab-slider{width:100%;accent-color:var(--lab-cyan)}.lab-toggle-row{display:flex;align-items:center;justify-content:space-between;gap:.5rem}.lab-toggle-label{font-size:.82rem;color:var(--lab-text-soft);cursor:pointer;-webkit-user-select:none;user-select:none}.lab-toggle-wrap{position:relative;display:inline-block;width:2.5rem;height:1.35rem;flex-shrink:0}.lab-toggle-wrap input{opacity:0;width:0;height:0;position:absolute}.lab-toggle-track{position:absolute;top:0;right:0;bottom:0;left:0;border-radius:9999px;background:var(--lab-border-strong);transition:background .2s;cursor:pointer}.lab-toggle-track:before{content:"";position:absolute;width:1rem;height:1rem;border-radius:50%;background:#fff;top:.175rem;left:.175rem;transition:transform .2s}.lab-toggle-wrap input:checked+.lab-toggle-track{background:var(--lab-cyan)}.lab-toggle-wrap input:checked+.lab-toggle-track:before{transform:translate(1.15rem)}.lab-toggle-wrap input:focus-visible+.lab-toggle-track{outline:2px solid var(--lab-primary);outline-offset:2px}.lab-status-card{display:flex;align-items:flex-start;gap:.55rem;padding:.65rem .85rem;border-radius:.375rem;border:1px solid var(--lab-border);background:var(--lab-surface-2)}.lab-status-icon{width:1.5rem;height:1.5rem;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0;font-size:.75rem}.lab-status-icon.is-success{background:#34d39926;color:var(--lab-success)}.lab-status-icon.is-warning{background:var(--lab-glow-amber);color:var(--lab-voltage)}.lab-status-title{font-size:.78rem;font-weight:700;color:var(--lab-success);margin:0}.lab-status-title.is-warning{color:var(--lab-voltage)}.lab-status-desc{font-size:.72rem;color:var(--lab-text-muted);margin:.1rem 0 0}.lab-challenges{border-top:1px solid var(--lab-border);background:var(--lab-surface);padding:1rem 1.25rem}.lab-challenges-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:.85rem}.lab-challenges-label{display:inline-flex;align-items:center;gap:.45rem;font-size:.68rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--lab-violet)}.lab-challenges-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:.75rem}.lab-challenge-card{border:1px solid rgba(167,139,250,.22);border-radius:.5rem;background:#a78bfa0d;padding:.8rem;display:flex;flex-direction:column;gap:.5rem;position:relative}.lab-challenge-num{width:1.75rem;height:1.75rem;border-radius:.375rem;background:#a78bfa33;border:1px solid rgba(167,139,250,.4);color:var(--lab-violet);font-size:.78rem;font-weight:800;display:flex;align-items:center;justify-content:center;flex-shrink:0}.lab-challenge-title{font-size:.88rem;font-weight:700;color:var(--lab-text);margin:0}.lab-challenge-goal-label{font-size:.68rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--lab-violet);margin:0}.lab-challenge-goal-text{font-size:.78rem;color:var(--lab-text-soft);margin:0;line-height:1.45}.lab-challenge-hint{font-size:.72rem;color:var(--lab-text-muted);margin:0}.lab-challenge-footer{display:flex;align-items:center;justify-content:flex-end;margin-top:auto;padding-top:.35rem}.lab-challenge-done-label{display:inline-flex;align-items:center;gap:.35rem;font-size:.76rem;font-weight:600;color:var(--lab-text-muted);cursor:pointer}.lab-challenge-done-label input[type=checkbox]{accent-color:var(--lab-violet);width:.9rem;height:.9rem}@media(max-width:1024px){.lab-shell-wrap{width:calc(100% - 1rem);margin:.5rem auto}.lab-shell-simulation-inner{min-height:520px}.lab-main-grid{grid-template-columns:1fr;min-height:auto;overflow:visible;align-items:normal}.lab-column-left,.lab-column-center,.lab-column-right{border-right:none;border-left:none;border-bottom:1px solid var(--lab-border);height:auto;overflow:visible}.lab-challenges-grid{grid-template-columns:1fr}}@media(max-height:760px){.lab-main-grid{min-height:auto;overflow:visible}.lab-column-left,.lab-column-center,.lab-column-right{height:auto;max-height:none}.lab-column-center{overflow:visible}}@media(max-width:640px){.lab-shell-back{margin-left:.75rem}.lab-shell-header{padding:.35rem .8rem .8rem}.lab-shell-simulation-inner{min-height:420px}.lab-challenges,.lab-shell-related{padding-left:.8rem;padding-right:.8rem}.lab-objectives-list{flex-direction:column}.lab-readout-strip{grid-template-columns:1fr}.lab-readout-cell{border-right:none;border-bottom:1px solid var(--lab-border)}}@media(prefers-reduced-motion:reduce){.lab-toggle-track,.lab-toggle-track:before,.lab-btn,.lab-segmented-btn,.lab-stage-tool-btn{transition:none}}