/* Lab Bench: one cobalt visual system, with matching light and slate-dark surfaces. */
.concept-shell.labbench,.lab-lesson{
 --bg:#f4f6fc;--fg:#1b2b4b;--sub:#52627c;--accent:#3c59d9;--border:#d0d9e8;
 --panel:#fff;--raised:#edf1fc;--selected:#e3eaff;--selected-ink:#2948b6;--button-ink:#fff;
 --diagram-a:#546dd1;--diagram-b:#507bb1;--diagram-c:#8a62bd;--diagram-bg:#dce5ff;--diagram-line:#425a80;
 --line:var(--border);--muted:var(--sub);color-scheme:light;
 background:var(--bg);color:var(--fg);
}
.concept-shell.labbench[data-lab-theme="dark"],.lab-lesson[data-lab-theme="dark"]{
 --bg:#111827;--fg:#edf2ff;--sub:#b4bfd3;--accent:#a5b4fc;--border:#34415c;
 --panel:#182235;--raised:#202d45;--selected:#273655;--selected-ink:#bdc8ff;--button-ink:#172044;
 --diagram-a:#a5b4fc;--diagram-b:#8fb8eb;--diagram-c:#c7b4f7;--diagram-bg:#202d45;--diagram-line:#aebfdd;
 color-scheme:dark;
}
.labbench .site-nav{padding:24px 4%;gap:24px}.labbench .site-logo{font-size:24px}.labbench .site-nav nav{font-size:14px}.labbench .site-nav .small-cta{font-size:13px;padding:11px 16px}
.labbench .lab-layout{grid-template-columns:230px minmax(0,1fr)}
.labbench .lab-sidebar{background:var(--panel);padding:34px 20px}.labbench .lab-sidebar .eyebrow{font-size:10px;margin-bottom:22px}
.labbench .lab-sidebar a,.labbench .lab-sidebar button{font-size:14px;line-height:1.4;padding:14px 12px;color:var(--fg)}
.labbench .lab-sidebar .selected{background:var(--selected);color:var(--selected-ink)}
.labbench .lab-sidebar a:hover,.labbench .lab-sidebar button:hover{background:var(--raised);text-decoration:none}
.labbench .sidebar-note{font-size:12px;line-height:1.9;color:var(--sub)}
.labbench .lab-main{padding:48px 4% 26px}.labbench .lab-heading{gap:20px;margin-bottom:35px;align-items:center}
.labbench .lab-heading .eyebrow{font-size:11px}.labbench .lab-heading h1{font-size:clamp(42px,4.5vw,66px);line-height:1.04;letter-spacing:-.055em;margin-top:17px}
.labbench .lab-heading p{font-size:16px;line-height:1.7;margin-top:16px}
.workspace-settings{display:flex;flex-direction:column;align-items:flex-end;gap:16px;flex-shrink:0}
.labbench .workspace-tag{font-size:9px;background:var(--panel);color:var(--sub)}
.theme-toggle{display:inline-flex;align-items:center;gap:9px;border:1px solid var(--border);border-radius:30px;padding:11px 14px;background:var(--panel);color:var(--fg);font-size:13px;white-space:nowrap;min-height:44px}
.theme-toggle>span:first-child{font-size:19px;line-height:1}.theme-track{display:block;width:29px;height:16px;border-radius:20px;background:var(--border);padding:3px}
.theme-track i{display:block;width:10px;height:10px;border-radius:50%;background:var(--fg)}.theme-toggle[aria-pressed="true"] .theme-track{background:var(--selected)}.theme-toggle[aria-pressed="true"] .theme-track i{transform:translateX(13px);background:var(--accent)}
.labbench .lab-feature{grid-template-columns:1fr 1fr;gap:22px;background:var(--panel);padding:34px;margin-bottom:45px;border-color:var(--border);border-radius:14px}
.labbench .lab-feature .eyebrow{font-size:10px;line-height:1.8}.labbench .lab-feature h2{font-size:clamp(34px,3vw,46px);line-height:1.08;margin:22px 0 18px;letter-spacing:-.05em}
.labbench .lab-feature p{font-size:16px;line-height:1.75;margin:0 0 26px;max-width:380px}
.labbench .primary{font-size:15px;padding:16px 20px;min-height:48px;color:var(--button-ink);background:var(--accent);gap:20px}
.feature-modes{font:9px/1.8 var(--mono);color:var(--sub);margin-top:23px;letter-spacing:.04em}.feature-modes span{margin:0 6px;opacity:.55}
.labbench .lab-feature .feature-art{background:var(--raised);border:1px solid var(--border);display:flex;flex-direction:column;justify-content:center;min-width:0;overflow:hidden}
.labbench[data-lab-theme="dark"] .lab-feature .feature-art{background:var(--raised)}
.labbench .lab-feature .feature-art svg{height:290px;width:100%}.feature-caption{font:9px var(--mono);color:var(--sub);padding:0 12px 20px;text-align:center}
.labbench .section-title{gap:20px;margin-bottom:25px}.labbench .section-title h2{font-size:30px;line-height:1.2}.labbench .section-title p{font-size:9px;line-height:1.9;text-align:right}
.labbench .lesson-grid{gap:18px}.labbench .lesson-tile{background:var(--panel);border-color:var(--border)}.labbench .tile-art{background:var(--raised);height:160px;border-color:var(--border)}.labbench .tile-art svg{height:200px}
.labbench .tile-body{padding:23px}.labbench .tile-body .eyebrow{font-size:9px;line-height:1.7}.labbench .tile-body h3{font-size:25px;line-height:1.2;margin:16px 0 14px;letter-spacing:-.035em}.labbench .tile-body p{font-size:15px;line-height:1.75;min-height:105px}
.labbench .tile-link{font-size:13px;line-height:1.5;gap:15px;padding-top:20px}.labbench .learning-callout{background:var(--panel);border-color:var(--border);padding:30px;gap:25px;margin-top:38px}.labbench .learning-callout h2{font-size:30px}.labbench .learning-callout p{font-size:15px;line-height:1.8}.labbench .learning-callout .secondary{font-size:13px;flex-shrink:0}
.labbench .site-footer{font-size:10px;line-height:1.8}
/* The lesson dialog follows the workspace theme, including its reading and controls. */
.lab-lesson{width:min(1120px,94vw);border-color:var(--border);--line:var(--border);--muted:var(--sub)}
.lab-lesson .dialog-head{padding:28px 34px 22px;gap:15px}.lab-lesson .dialog-head h2{font-size:34px;line-height:1.15;margin-top:12px}.lab-lesson .dialog-head .eyebrow{font-size:10px;line-height:1.8}.lab-lesson .close-dialog{color:var(--fg);width:44px;height:44px;flex-shrink:0}
.lab-lesson .lesson-tabs{padding:20px 34px 0;gap:7px}.lab-lesson .lesson-tabs button{font-size:14px;padding:12px 17px;border-radius:5px;background:var(--raised);color:var(--sub);min-height:44px}.lab-lesson .lesson-tabs button[aria-selected=true]{background:var(--accent);color:var(--button-ink)}
.lab-lesson .lesson-panel{padding:30px 34px 34px}.lab-lesson .lesson-panel h3{font-size:30px;line-height:1.2;margin-bottom:18px}.lab-lesson .lesson-panel p{font-size:16px;line-height:1.8;color:var(--sub)}
.lab-lesson .reading{max-width:740px}.lab-lesson .reading h4{font-size:19px;margin:28px 0 12px}.lab-lesson .reading strong{color:var(--fg)}.lab-lesson .reading a{color:var(--selected-ink)}
.lab-lesson .sim-grid{grid-template-columns:minmax(0,1fr) 240px;gap:28px;margin-top:25px}.lab-lesson .sim-canvas{height:340px;border:1px solid var(--border);border-radius:8px}
.lab-lesson .sim-readout{font-size:12px;line-height:1.8;gap:10px;flex-wrap:wrap;margin:16px 0}.lab-lesson .sim-settings label{font-size:14px;line-height:1.5;margin-bottom:26px;color:var(--fg)}.lab-lesson .sim-settings input{accent-color:var(--accent);margin-top:15px;min-height:22px}.lab-lesson .sim-settings output{font:13px var(--mono);line-height:1.7}
.lab-lesson .sim-buttons{flex-wrap:wrap;gap:8px}.lab-lesson .sim-buttons button,.lab-lesson .practice-options button{background:var(--raised);border:1px solid var(--border);color:var(--fg);font-size:14px;padding:12px 17px;min-height:44px}.lab-lesson .sim-buttons button:first-child{background:var(--accent);color:var(--button-ink);border-color:var(--accent)}
.lab-lesson .feedback{background:var(--selected);border-color:var(--accent);color:var(--fg);font-size:15px;line-height:1.8;padding:20px 23px}.lab-lesson .small-note,.lab-lesson .media-note{font-size:12px!important;line-height:1.9;color:var(--sub)}
.lab-lesson .quiz-form fieldset{border-color:var(--border);padding:24px}.lab-lesson .quiz-form legend{font-size:17px;line-height:1.5}.lab-lesson .quiz-form label{font-size:16px;line-height:1.8;gap:12px}.lab-lesson .quiz-form input{accent-color:var(--accent);width:17px;height:17px;flex-shrink:0;margin-top:6px}
.lab-lesson .quiz-form button,.lab-lesson .neutral-button{background:var(--accent);color:var(--button-ink);padding:14px 20px;font-size:15px;min-height:46px}
/* Keep the gallery thumbnail consistent with the refined direction. */
.thumb.labbench{--bg:#111827;--fg:#edf2ff;--sub:#b4bfd3;--accent:#a5b4fc;--border:#34415c;--panel:#182235;--button-ink:#172044;--diagram-a:#a5b4fc;--diagram-b:#8fb8eb;--diagram-bg:#202d45;--diagram-line:#aebfdd;background:var(--bg);color:var(--fg)}
.thumb.labbench .mini-nav,.thumb.labbench .mini-sidebar{background:var(--panel)}.thumb.labbench .mini-button{background:var(--accent);color:var(--button-ink)}.thumb.labbench .mini-art{opacity:.9}
.labbench :is(button,a,input,select,textarea,summary):focus-visible,.lab-lesson :is(button,a,input,select,textarea,summary):focus-visible{outline-color:var(--accent)}
@media(min-width:1001px) and (max-width:1250px){.labbench .lesson-grid{grid-template-columns:1fr}.labbench .lesson-tile{display:grid;grid-template-columns:190px minmax(0,1fr)}.labbench .tile-art{height:100%;border-bottom:0;border-right:1px solid var(--border)}.labbench .tile-body p{min-height:0}}
@media(min-width:701px) and (max-width:1000px){.labbench .lab-layout{grid-template-columns:185px minmax(0,1fr)}.labbench .lab-sidebar{padding:30px 12px}.labbench .lab-sidebar a,.labbench .lab-sidebar button{font-size:13px;padding:13px 9px}.labbench .lab-main{padding:35px 5%}.labbench .lab-heading{align-items:flex-start;flex-direction:column;gap:20px}.workspace-settings{flex-direction:row;align-items:center}.labbench .lab-heading h1{font-size:48px}.labbench .lab-heading h1 br{display:none}.labbench .lab-feature{grid-template-columns:1fr;padding:28px}.labbench .lab-feature .feature-art svg{height:275px}.labbench .lab-feature p{max-width:100%}.labbench .lesson-tile{grid-template-columns:150px minmax(0,1fr)}.labbench .tile-art{height:100%;border-bottom:0;border-right:1px solid var(--border)}.labbench .tile-body p{min-height:0}.labbench .learning-callout{display:block}.labbench .learning-callout .secondary{margin-top:20px;display:inline-block}}
@media(max-width:850px){.lab-lesson .sim-grid{grid-template-columns:1fr}.lab-lesson .sim-settings{display:grid;grid-template-columns:1fr 1fr;gap:16px 25px}.lab-lesson .sim-settings label{margin-bottom:5px}.lab-lesson .sim-buttons{grid-column:1/-1;margin-top:0}.lab-lesson .sim-settings>p{grid-column:1/-1}}
@media(max-width:700px){.labbench .site-nav{padding:22px 6%;gap:18px}.labbench .site-logo{font-size:23px}.labbench .site-nav nav{font-size:13px;gap:22px}.labbench .lab-layout{display:block}.labbench .lab-sidebar{padding:12px 5%;gap:6px;scrollbar-width:thin}.labbench .lab-sidebar a,.labbench .lab-sidebar button{font-size:12px;padding:12px 10px;margin:0;min-height:44px}.labbench .lab-main{padding:30px 5%}.labbench .lab-heading{display:block;margin-bottom:28px}.labbench .lab-heading h1{font-size:49px;margin-top:18px}.labbench .lab-heading p{font-size:16px}.workspace-settings{flex-direction:row;align-items:center;justify-content:space-between;margin-top:22px}.labbench .workspace-tag{display:none}.theme-toggle{font-size:13px;padding:11px 15px}.labbench .lab-feature{grid-template-columns:1fr;padding:25px;gap:28px;margin-bottom:36px}.labbench .lab-feature h2{font-size:37px}.labbench .lab-feature p{font-size:16px}.labbench .lab-feature .feature-art svg{height:240px}.feature-caption{font-size:8px}.feature-modes{font-size:8px;line-height:2}.feature-modes span{margin:0 3px}.labbench .section-title{display:block}.labbench .section-title h2{font-size:29px}.labbench .section-title p{text-align:left;margin-top:14px}.labbench .lesson-tile{display:block}.labbench .tile-art{height:180px;border-right:0;border-bottom:1px solid var(--border)}.labbench .tile-body{padding:24px}.labbench .tile-body p{min-height:0;font-size:16px}.labbench .tile-body h3{font-size:27px}.labbench .learning-callout{padding:25px}.labbench .learning-callout h2{font-size:29px}.labbench .learning-callout p{font-size:16px}.labbench .site-footer{font-size:9px}.lab-lesson .dialog-head{padding:22px 20px 18px}.lab-lesson .dialog-head h2{font-size:28px}.lab-lesson .dialog-head .eyebrow{font-size:9px}.lab-lesson .lesson-tabs{padding:16px 20px 0;gap:5px}.lab-lesson .lesson-tabs button{font-size:13px;padding:11px 13px}.lab-lesson .lesson-panel{padding:25px 20px}.lab-lesson .lesson-panel h3{font-size:26px}.lab-lesson .lesson-panel p{font-size:16px}.lab-lesson .sim-canvas{height:260px}.lab-lesson .sim-grid{gap:20px}.lab-lesson .sim-settings{gap:18px}.lab-lesson .sim-settings label{font-size:13px}.lab-lesson .sim-settings output{font-size:12px}.lab-lesson .sim-readout{font-size:11px}.lab-lesson .quiz-form fieldset{padding:18px}.lab-lesson .quiz-form legend{font-size:16px}.lab-lesson .quiz-form label{font-size:16px}.lab-lesson .feedback{padding:17px 20px}.lab-lesson .small-note{font-size:12px!important}}