.lab-header{display:flex;justify-content:space-between;gap:20px;align-items:center;padding:22px max(5%,20px);border-bottom:1px solid var(--line);flex-wrap:wrap}.lab-header-tools{display:flex;align-items:center;gap:18px}.lab-wrap{max-width:1320px;margin:auto;padding:42px 35px}.lab-intro{max-width:850px;margin-bottom:30px}.lab-intro h1{font:italic 500 clamp(32px,4vw,52px)/1.15 var(--head);color:var(--accent);margin:12px 0 18px}.lab-intro>p:not(.eyebrow){color:var(--muted);font-size:16px}.lab-question{border-left:2px solid var(--lavender);padding-left:18px}.lab-workspace{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(280px,1fr);gap:22px;align-items:start}.lab-stage,.lab-controls,.lab-chart-panel,.lab-theory,.lab-learning,.reference-section{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:25px;min-width:0}.lab-paneltop{display:flex;align-items:center;justify-content:space-between;gap:14px}.lab-paneltop h2,.lab-controls h2,.lab-theory h2,.lab-learning h2,.reference-section h2{font-size:20px;font-weight:500;margin:0 0 18px}.lab-status{font-size:11px;white-space:nowrap;border:1px solid var(--line);border-radius:20px;padding:5px 10px;color:var(--accent)}.lab-scene{display:block;width:100%;background:var(--soft);border-radius:12px;margin:18px 0 10px}.lab-caption{color:var(--muted);font-size:12px;line-height:1.7}.lab-transport{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:22px}.lab-time{margin-left:auto;font:19px var(--mono);color:var(--accent)}input[type=range]{accent-color:var(--accent);width:100%;min-height:32px;cursor:pointer}.lab-metrics{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:28px}.lab-metric{padding:13px;background:var(--panel2);border-radius:10px;min-width:0}.lab-metric span{display:block;font-size:12px;color:var(--muted);min-height:40px}.lab-metric strong{display:block;font:24px var(--mono);font-variant-numeric:tabular-nums;color:var(--accent);overflow-wrap:anywhere}.lab-metric small{font:12px var(--mono);color:var(--muted)}.lab-control{display:grid;grid-template-columns:1fr auto;gap:5px 12px;align-items:start;font-size:12px;margin-bottom:14px}.lab-control output{font:13px var(--mono);color:var(--accent)}.lab-control input{grid-column:1/-1}.reverse{width:100%;font-size:12px}.lab-chart-panel,.lab-theory,.lab-learning,.reference-section{margin-top:22px}.lab-chart-panel>svg{width:100%;display:block}.lab-chart-panel .button{font-size:11px;min-height:35px;padding:6px 12px}.lab-theory p,.lab-learning p{color:var(--muted);font-size:14px;line-height:1.8}.lab-formula{font-family:var(--mono);font-size:14px;color:var(--accent);background:var(--soft);padding:15px;border-radius:10px;line-height:2;overflow-x:auto}.lab-theory details{border-top:1px solid var(--line);padding-top:18px;margin-top:20px}.lab-theory summary{cursor:pointer;font-size:14px}.lab-learning #learning-content{padding-top:20px}.clock-frames h3{font-size:14px;font-weight:500;color:var(--accent);margin:20px 0 0}.clock-frames .lab-scene{margin-top:10px}.clock-period{grid-column:1/-1;font-size:12px;color:var(--muted)}.clock-period p{font-family:var(--mono);color:var(--accent);line-height:1.8}.lab-footer{display:flex;justify-content:space-between;gap:20px;font-size:12px;color:var(--muted);padding:28px 0}.lab-scene text,#lab-chart text{font-family:var(--mono)}.reference-section ol{margin:0;padding-left:22px}.reference-section li{padding:12px 0;border-bottom:1px solid var(--line);font-size:13px;line-height:1.7;color:var(--muted)}.reference-section li:last-child{border:0}.reference-section cite{font-style:normal;color:var(--text,var(--ink))}.reference-section a{color:var(--accent,var(--blue));text-decoration:underline;text-underline-offset:3px}.reference-section>p{font-size:12px;color:var(--muted)}
@media(max-width:850px){.lab-workspace{grid-template-columns:1fr}.lab-wrap{padding:28px 20px}.lab-controls{display:grid;grid-template-columns:1fr 1fr;gap:0 18px}.lab-controls>.eyebrow,.lab-controls>.lab-metrics,.lab-controls>h2,.lab-controls>.reverse{grid-column:1/-1}}
@media(max-width:480px){.lab-header{padding:18px 20px}.lab-header .brand{font-size:23px}.lab-header-tools{width:100%;justify-content:space-between;gap:8px}.lab-stage,.lab-controls,.lab-chart-panel,.lab-theory,.lab-learning,.reference-section{padding:18px}.lab-paneltop{align-items:start;flex-wrap:wrap}.lab-controls{display:block}.lab-transport .button{padding:9px 14px;font-size:12px}.lab-time{font-size:16px}.lab-metric strong{font-size:21px}.lab-control{margin:17px 0}}

:root{--lab-orange:#e7b38e}:root[data-theme=light]{--lab-orange:#a94e25}

/* Shared instrument terminals use the same instantaneous model voltage. */
.instruments-section{margin-top:30px}.instruments-section>h2{font-size:25px;font-weight:500}.instruments-grid{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(280px,1fr);gap:22px;align-items:stretch}.instrument-card{min-width:0;padding:25px;border:1px solid var(--line);background:var(--panel);border-radius:16px}.instrument-card h3{margin:0 0 14px;font-size:22px;font-weight:500}.channel-tag{font:14px var(--mono);color:var(--accent);border:1px solid var(--line);border-radius:5px;padding:4px 7px;margin-left:8px}.instrument-card>svg{display:block;width:100%;height:auto;margin:14px 0 20px}#scope-screen{background:#08151e;border:1px solid #385161;border-radius:12px}.instrument-card svg text{font-family:var(--mono)}.instrument-reading{font-size:16px;color:var(--muted);margin:14px 0;display:flex;gap:10px;flex-wrap:wrap;justify-content:space-between}.instrument-reading strong{font:22px var(--mono);color:var(--accent)}.instrument-warning{color:var(--lab-orange);font-size:16px;border-left:3px solid var(--lab-orange);padding:8px 12px}.lab-intro>p:not(.eyebrow){font-size:19px}.lab-caption,.lab-control,.clock-period,.reference-section li,.reference-section>p{font-size:16px}.lab-control output{font-size:17px}.lab-metric span{font-size:15px;min-height:48px}.lab-metric strong{font-size:28px}.lab-metric small{font-size:15px}.lab-status{font-size:14px;white-space:normal}.lab-paneltop h2,.lab-controls h2,.lab-theory h2,.lab-learning h2,.reference-section h2{font-size:24px}.lab-theory p,.lab-learning p{font-size:18px}.lab-theory h3{font-size:21px}.reverse,.lab-chart-panel .button{font-size:16px;min-height:44px}.lab-time{font-size:22px}.clock-frames h3,.lab-footer{font-size:17px}.lab-header-tools{flex-wrap:wrap}input[type=range]{min-height:44px}.lab-scene{margin-top:22px}.lab-chart-panel>svg{min-width:0}
@media(max-width:950px){.lab-workspace,.instruments-grid{grid-template-columns:minmax(0,1fr)}.instrument-card{padding:24px}.lab-stage,.lab-controls{padding:24px}#meter-screen{max-width:440px;margin:18px auto}.lab-controls{display:grid;grid-template-columns:1fr 1fr;gap:0 20px}.lab-controls>.eyebrow,.lab-controls>.lab-metrics,.lab-controls>h2,.lab-controls>.reverse{grid-column:1/-1}}
@media(max-width:600px){.lab-wrap{padding:24px 14px}.lab-header{padding:18px 16px}.lab-header-tools{justify-content:center;gap:12px;width:100%}.lab-stage,.lab-controls,.lab-chart-panel,.lab-theory,.lab-learning,.reference-section,.instrument-card{padding:18px 14px}.lab-controls{display:block}.lab-transport .button{font-size:16px;padding:10px 16px;min-height:44px}.lab-time{font-size:19px}.lab-metric strong{font-size:26px}.lab-caption{font-size:16px}.lab-metric span{font-size:15px}.lab-intro>p:not(.eyebrow),.lab-theory p,.lab-learning p{font-size:17px}.lab-paneltop h2{font-size:22px}.lab-paneltop{flex-wrap:wrap}.lab-metrics{gap:10px}.instrument-reading strong{font-size:21px}.lab-footer{flex-wrap:wrap}.reference-section li{overflow-wrap:anywhere}}
.scope-scale{font:16px/1.7 var(--mono);color:var(--accent);overflow-wrap:anywhere}.plot-scroll{max-width:100%;overflow-x:auto;border-radius:8px}.plot-scroll>svg{display:block;width:100%;min-width:620px;max-width:none}.plot-scroll:focus-visible{outline:3px solid var(--accent);outline-offset:4px}@media(max-width:600px){.lab-scene text{font-size:27px}}

/* Observation-first layout: motion, signal and needle share one viewing area. */
body[data-lab=ind] .lab-wrap{max-width:1560px;padding-left:28px;padding-right:28px}.observation-section{scroll-margin-top:12px}.observation-toolbar{display:flex;justify-content:space-between;align-items:center;gap:18px;margin-bottom:14px}.observation-toolbar h2{font-size:22px;font-weight:500;margin:0}.observation-toolbar .button{flex-shrink:0}.observation-grid{display:grid;grid-template-columns:minmax(0,1.08fr) minmax(0,1fr);gap:16px;align-items:start}.observation-grid .lab-stage{padding:18px}.observation-grid .lab-paneltop h2{font-size:20px;margin-bottom:0}.observation-grid .lab-scene{margin:14px 0 8px}.observation-grid .lab-transport{margin-top:10px}.observation-grid .under-animation{margin-top:10px}.under-animation>.eyebrow{margin:6px 0 10px;letter-spacing:1px}.under-animation .lab-metrics{grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin:0}.under-animation .lab-metric{padding:9px}.under-animation .lab-metric span{font-size:14px;min-height:38px;line-height:1.3}.under-animation .lab-metric strong{font-size:23px}.under-animation .lab-metric small{font-size:13px}.observation-grid .instruments-section{margin:0;min-width:0}.observation-grid .instruments-section>h2{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}.observation-grid .instruments-grid{grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);gap:12px;align-items:start}.observation-grid .instrument-card{padding:16px 12px}.observation-grid .instrument-card h3{font-size:18px;line-height:1.3;min-height:48px;margin-bottom:8px}.observation-grid .instrument-card>svg{margin:8px 0 12px;max-width:100%}.observation-grid .instrument-reading{font-size:15px;display:block;margin:12px 0;line-height:1.45}.observation-grid .instrument-reading strong{display:block;margin-top:4px;font-size:22px}.observation-grid .scope-scale{font-size:14px;line-height:1.5;margin:8px 0}.observation-grid .instrument-warning{font-size:14px;padding:6px 8px}.observation-grid .channel-tag{display:inline-block;margin-left:4px;font-size:12px}body[data-lab=ind] .lab-controls{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px 24px;margin-top:18px;padding:22px}body[data-lab=ind] .lab-controls>h2,body[data-lab=ind] .playback-note{grid-column:1/-1}body[data-lab=ind] .lab-controls>.reverse{grid-column:auto;align-self:center}body[data-lab=ind] .lab-controls>h2{margin-bottom:4px}.playback-note{font-size:16px;color:var(--muted);margin:0}.setup-notes .lab-caption{font-size:16px}.observation-grid #meter-screen{width:100%;height:auto}.observation-grid .lab-time{font-size:19px}
/* A non-modal focus view removes surrounding prose, retaining controls and keyboard access. */
body[data-observation-focus=true] .lab-header,body[data-observation-focus=true] .lab-intro,body[data-observation-focus=true] .setup-notes,body[data-observation-focus=true] .lab-chart-panel,body[data-observation-focus=true] .lab-theory,body[data-observation-focus=true] .lab-learning,body[data-observation-focus=true] .reference-section,body[data-observation-focus=true] .lab-footer{display:none}body[data-observation-focus=true] .lab-wrap{padding-top:14px;padding-bottom:14px;max-width:1600px}
@media(min-width:1000px){.observation-grid .lab-scene{max-height:270px}.observation-grid #scope-screen,.observation-grid #meter-screen{height:210px}.observation-grid .lab-stage{padding:16px}}
@media(min-width:700px) and (max-width:999px){.observation-grid{grid-template-columns:minmax(0,1.12fr) minmax(0,1fr);gap:12px}.observation-grid .instruments-grid{grid-template-columns:1fr}.observation-grid .instrument-card{display:grid;grid-template-columns:minmax(0,1fr) minmax(90px,.75fr);gap:6px 10px;padding:12px}.observation-grid .instrument-card h3{grid-column:1/-1;min-height:0;font-size:17px;margin:0}.observation-grid .instrument-card>svg{grid-row:2/5;align-self:start;margin:0}.observation-grid .instrument-reading{font-size:14px;margin:0}.observation-grid .instrument-reading strong{font-size:19px}.observation-grid .scope-scale{font-size:13px;margin:0}.observation-grid .lab-stage{padding:12px}.under-animation .lab-metrics{grid-template-columns:repeat(2,minmax(0,1fr))}.observation-grid .lab-paneltop{flex-wrap:wrap}.observation-grid .lab-time{margin-left:0}.observation-grid .instrument-warning{grid-column:1/-1}}
@media(max-width:699px){body[data-lab=ind] .lab-wrap{padding-left:12px;padding-right:12px}.observation-toolbar{flex-wrap:wrap;gap:8px}.observation-toolbar h2{font-size:18px}.observation-toolbar .button{font-size:14px;min-height:44px;padding:8px 12px}.observation-grid{grid-template-columns:minmax(0,1fr);gap:10px}.observation-grid .lab-stage{padding:12px}.observation-grid .lab-paneltop h2{font-size:17px}.observation-grid .lab-status{font-size:12px}.observation-grid .lab-scene{max-height:170px;margin:8px 0 0}.observation-grid .lab-transport{margin-top:4px;gap:8px}.observation-grid .lab-transport .button{font-size:14px;padding:8px 10px}.observation-grid .lab-time{font-size:16px}.observation-grid .under-animation{margin-top:2px}.under-animation>.eyebrow{display:none}.under-animation .lab-metrics{grid-template-columns:repeat(3,minmax(0,1fr));gap:5px}.under-animation .lab-metric{padding:6px}.under-animation .lab-metric span{font-size:12px;min-height:30px}.under-animation .lab-metric strong{font-size:18px}.under-animation .lab-metric small{font-size:12px}.observation-grid .instruments-grid{grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:8px}.observation-grid .instrument-card{padding:10px}.observation-grid .instrument-card h3{font-size:15px;min-height:38px;margin:0}.observation-grid .instrument-card>svg{height:105px;margin:3px 0 6px}.observation-grid .channel-tag{font-size:10px;padding:2px 4px}.observation-grid .instrument-reading{font-size:12px;margin:5px 0}.observation-grid .instrument-reading strong{font-size:18px;margin-top:1px}.observation-grid .scope-scale{font-size:12px;margin:4px 0}.observation-grid .instrument-warning{font-size:12px}.observation-grid #meter-screen{height:105px}body[data-lab=ind] .lab-controls{grid-template-columns:minmax(0,1fr);padding:18px;gap:8px}body[data-lab=ind] .lab-controls>.reverse{grid-column:1/-1}}

/* Cycle controls and a comparison plot directly below the oscilloscope. */
.observation-grid .instruments-grid{grid-template-areas:'scope meter' 'chart meter';align-items:start}.observation-grid .scope-card{grid-area:scope}.observation-grid .meter-card{grid-area:meter}.observation-grid .lab-chart-panel{grid-area:chart;margin:0;padding:12px;min-width:0}.observation-grid .lab-chart-panel .lab-paneltop{display:flex;flex-wrap:wrap;gap:8px}.observation-grid .lab-chart-panel h2{font-size:17px;margin:0;width:100%}.observation-grid .lab-chart-panel .button,.observation-grid .scope-fit{font-size:13px;min-height:44px;padding:7px 10px}.observation-grid .plot-scroll>svg{min-width:0;width:100%;height:auto}.observation-grid .lab-chart-panel .lab-caption{font-size:13px;line-height:1.5}.observation-grid .instruments-grid[data-chart-expanded=true]{grid-template-areas:'scope meter' 'chart chart'}.observation-grid .lab-chart-panel[data-expanded=true] .plot-scroll>svg{min-width:560px}.cycle-count{font:14px var(--mono);color:var(--accent);margin:9px 0}.observation-grid .scope-fit{width:100%}body[data-observation-focus=true] .observation-grid .lab-chart-panel{display:block}
/* This is the subject title, not a small eyebrow label. */
.lab-intro>.eyebrow{font-size:clamp(23px,2.6vw,34px);line-height:1.25;letter-spacing:.035em;font-weight:650;color:var(--accent);margin-bottom:18px}.observation-grid .lab-paneltop h2{font-size:clamp(20px,1.8vw,26px);line-height:1.25}
@media(min-width:700px) and (max-width:999px){.observation-grid .instruments-grid{grid-template-areas:'scope' 'chart' 'meter'}.observation-grid .instruments-grid[data-chart-expanded=true]{grid-template-areas:'scope' 'chart' 'meter'}.observation-grid .scope-card .scope-fit,.observation-grid .scope-card .cycle-count{grid-column:1/-1}.observation-grid .lab-chart-panel[data-expanded=true] .plot-scroll>svg{min-width:560px}}
@media(max-width:699px){.observation-grid .lab-paneltop h2{font-size:20px}.observation-grid .lab-chart-panel h2{font-size:15px}.observation-grid .lab-chart-panel .button{font-size:12px}.lab-intro>.eyebrow{font-size:24px;letter-spacing:.02em}}
.observation-grid .lab-chart-panel[data-expanded=true] #lab-chart text{font-size:15px}
.clock-grid-scroll{max-width:100%;overflow-x:auto}.clock-grid-scroll .lab-scene{min-width:740px;width:100%;max-width:none}.clock-grid-scroll:focus-visible{outline:3px solid var(--accent)}

.lab-intro>.eyebrow{font-size:clamp(1.15rem,2.2vw,1.8rem);line-height:1.45;letter-spacing:.06em}