.brain-page{--n-accent:#17694f;--n-warm:#a66329;--n-text:var(--color-text);--n-muted:var(--color-muted);--n-line:var(--color-border);--n-surface:var(--color-surface);--n-soft:var(--color-surface-soft);width:min(100%,1376px);color:var(--n-text);margin:0 auto;padding:46px clamp(20px,4vw,64px) 32px}[data-theme=dark] .brain-page{--n-accent:#96ddbe;--n-warm:#e3b084}.brain-page *{min-width:0}.brain-page :is(button,a,input,summary,canvas):focus-visible{outline:3px solid var(--n-accent);outline-offset:5px}.brain-page a{text-underline-offset:4px}.brain-page p{line-height:1.75}.brain-page :is(h1,h2,h3,p){margin-top:0}.brain-page h2{letter-spacing:-.045em;font-size:clamp(30px,3.8vw,49px);font-weight:550;line-height:1.13}.brain-page h3{letter-spacing:-.025em;font-size:21px;font-weight:600;line-height:1.3}.brain-page button{cursor:pointer}.brain-page button:disabled{cursor:default;opacity:.4}.brain-back{color:var(--n-muted);margin-bottom:62px;font-size:13px;text-decoration:none;display:inline-block}.brain-back:hover{color:var(--n-accent)}.brain-kicker{letter-spacing:.15em;color:var(--n-accent);font-size:10px;font-weight:700;line-height:1.7;display:block}.brain-hero{grid-template-columns:1fr .36fr;align-items:end;gap:64px;padding-bottom:46px;display:grid}.brain-hero h1{letter-spacing:-.065em;margin:23px 0;font-size:clamp(52px,7.5vw,98px);font-weight:500;line-height:1.04}.brain-hero h1 span{color:var(--n-accent)}.brain-lead{max-width:670px;color:var(--n-muted);margin-bottom:0;font-size:clamp(16px,1.6vw,18px)}.brain-hero-note{border-left:1px solid var(--n-line);padding:12px 0 12px 27px}.brain-hero-note p{letter-spacing:-.035em;margin:22px 0;font-size:clamp(28px,3vw,40px);line-height:1.2}.brain-hero-note em{color:var(--n-accent);font-family:Georgia,serif;font-weight:400}.brain-hero-note>span:last-child{color:var(--n-muted);font-size:11px;line-height:1.8}.brain-page-nav{border-block:1px solid var(--n-line);flex-wrap:wrap;gap:12px 28px;padding:19px 0;display:flex}.brain-page-nav a{color:var(--n-accent);gap:10px;font-size:11px;text-decoration:none;display:flex}.brain-page-nav span{color:var(--n-text)}.brain-page-nav a:hover span{color:var(--n-accent)}.brain-section{border-bottom:1px solid var(--n-line);padding:86px 0;scroll-margin-top:20px}.brain-atlas-section{padding-top:42px}.brain-section-heading{max-width:760px;margin-bottom:32px}.brain-section-heading h2{margin:13px 0 20px}.brain-section-heading p{max-width:650px;color:var(--n-muted);margin-bottom:0}.brain-explorer-toolbar{justify-content:space-between;align-items:center;gap:24px;margin-bottom:25px;display:flex}.brain-explorer-toolbar h2{margin:8px 0 0;font-size:clamp(28px,3vw,38px)}.brain-segment{flex-wrap:wrap;gap:5px;display:flex}.brain-segment button{border:1px solid var(--n-line);background:var(--n-surface);border-radius:5px;min-height:42px;padding:10px 16px;font-size:12px}.brain-segment button[aria-pressed=true]{background:var(--n-accent);border-color:var(--n-accent);color:var(--n-surface)}.brain-segment button:hover{border-color:var(--n-accent)}.brain-explorer-grid{grid-template-columns:minmax(0,1fr) 314px;gap:24px;display:grid}.brain-stage{background:radial-gradient(at 45% 45%,#26443c 0,#102822 45%,#091b19 90%);border:1px solid #34534a;border-radius:12px;height:505px;position:relative;overflow:hidden}.brain-stage:before{content:"";pointer-events:none;background-image:linear-gradient(#99c7b909 1px,#0000 1px),linear-gradient(90deg,#99c7b909 1px,#0000 1px);background-size:34px 34px;position:absolute;inset:0;-webkit-mask-image:radial-gradient(#000 5%,#0000 75%);mask-image:radial-gradient(#000 5%,#0000 75%)}.brain-stage-head{pointer-events:none;z-index:1;color:#9fbbb0;letter-spacing:.1em;flex-wrap:wrap;justify-content:space-between;gap:10px;font-size:8px;display:flex;position:absolute;inset:20px 22px auto}.brain-stage-head i{background:#a7dbc3;border-radius:50%;width:5px;height:5px;margin-right:4px;display:inline-block}.brain-canvas{touch-action:none;cursor:grab;width:100%;height:100%;position:absolute;inset:0}.brain-canvas:active{cursor:grabbing}.brain-canvas:focus-visible{outline-offset:-5px;outline-color:#c3f7df}.brain-canvas.is-unavailable{visibility:hidden}.brain-orientation{pointer-events:none;width:108px;height:100px;font:9px monospace;position:absolute;bottom:34px;right:8px}.brain-stage-caption{color:#b6c9c0;pointer-events:none;margin:0;font-size:10px;position:absolute;bottom:17px;left:20px;right:20px}.brain-fallback{width:84%;height:84%;position:absolute;inset:8%}.brain-view-controls{flex-wrap:wrap;align-items:center;gap:14px;padding:15px 0 5px;display:flex}.brain-view-controls button{color:var(--n-muted);background:0 0;border:0;min-height:34px;padding:6px 7px;font-size:10px}.brain-view-controls button:hover{color:var(--n-accent);background:var(--n-soft);border-radius:4px}.brain-presets{flex-wrap:wrap;gap:1px;display:flex}.brain-view-controls label{color:var(--n-muted);align-items:center;gap:8px;font-size:10px;display:flex}.brain-view-controls input{width:78px;accent-color:var(--n-accent)}.brain-small{color:var(--n-muted);margin:14px 0 0;font-size:11px}.brain-inspector{border:1px solid var(--n-line);background:var(--n-surface);border-top:3px solid var(--region-color);border-radius:8px;align-self:start;padding:26px 24px}.brain-inspector .brain-kicker{color:var(--n-muted);font-size:9px}.brain-inspector h3{letter-spacing:-.04em;margin:17px 0 7px;font-size:30px;line-height:1.07}.brain-region-subtitle{color:var(--n-accent);font-size:11px}.brain-inspector dl{margin:24px 0 0}.brain-inspector dt{letter-spacing:.025em;margin:18px 0 6px;font-size:10px;font-weight:700}.brain-inspector dd{color:var(--n-muted);margin:0;font-size:12px;line-height:1.65}.brain-inspector-note{border-top:1px solid var(--n-line);color:var(--n-accent);margin:20px 0 0;padding-top:14px;font-size:11px}.brain-region-grid{grid-template-columns:repeat(5,1fr);gap:8px;margin-top:23px;display:grid}.brain-region-grid button{text-align:left;background:var(--n-surface);border:1px solid var(--n-line);border-radius:5px;align-items:center;gap:9px;min-height:56px;padding:12px;font-size:11px;display:flex}.brain-region-grid button[aria-pressed=true]{box-shadow:inset 0 -3px 0 var(--region-color);border-color:var(--n-accent)}.brain-region-grid button:hover{border-color:var(--n-accent)}.brain-region-grid i{background:var(--region-color);border-radius:50%;flex-shrink:0;width:9px;height:9px;box-shadow:0 0 0 1px #0001}.brain-region-grid small{color:var(--n-muted);margin-top:2px;font-size:8px;display:block}.brain-challenge{border:1px solid var(--n-line);background:var(--n-soft);border-radius:8px;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:20px;margin-top:25px;padding:25px 28px;display:flex}.brain-challenge h3{margin:5px 0}.brain-challenge p{color:var(--n-muted);margin-bottom:0;font-size:12px}.brain-challenge button,.brain-lab-actions button{border:1px solid var(--n-line);background:var(--n-surface);border-radius:5px;min-height:42px;padding:10px 14px;font-size:12px}.brain-challenge button:hover,.brain-lab-actions button:not(:disabled):hover{border-color:var(--n-accent)}.brain-challenge>button,.brain-lab-actions button:first-child{color:var(--n-surface);border-color:var(--n-accent);background:var(--n-accent)}.brain-challenge-body{border-top:1px solid var(--n-line);flex-basis:100%;padding-top:23px}.brain-challenge-body>p{color:var(--n-text);margin:14px 0;font-size:16px}.brain-challenge-actions{flex-wrap:wrap;align-items:center;gap:15px;font-size:12px;display:flex}.brain-challenge .brain-feedback{color:var(--n-accent);margin-top:18px}.brain-feedback button{margin:10px 0 0 8px}.brain-system-grid{grid-template-columns:1fr 1fr;gap:20px;display:grid}.brain-system-grid article{border:1px solid var(--n-line);background:var(--n-surface);border-radius:8px;padding:30px}.brain-card-index{color:var(--n-accent);margin-bottom:25px;font-family:monospace;font-size:12px;display:block}.brain-system-grid h3{font-size:26px}.brain-system-grid p,.brain-reading-grid p,.brain-concept-grid p{color:var(--n-muted);font-size:14px}.brain-system-grid a{color:var(--n-accent);font-size:12px}.brain-direction-strip{background:var(--n-soft);border-radius:8px;grid-template-columns:1fr 1fr;gap:28px;margin:20px 0 35px;padding:28px 30px;display:grid}.brain-direction-strip span{letter-spacing:.12em;color:var(--n-accent);margin-bottom:9px;font-size:9px;display:block}.brain-direction-strip strong{font-size:14px;font-weight:550}.brain-direction-strip p{color:var(--n-muted);margin:8px 0 0;font-size:12px}.brain-reading-grid{grid-template-columns:1fr 1fr;gap:40px;display:grid}.brain-reading-grid h3{font-size:18px}.brain-source-note{color:var(--n-muted);margin:22px 0 0;font-size:11px}.brain-source-note a{color:var(--n-accent)}.brain-lab{border:1px solid var(--n-line);background:var(--n-surface);border-radius:10px;padding:30px}.brain-lab-intro{color:var(--n-muted);max-width:760px;margin:20px 0;font-size:13px}.brain-pathway-grid{grid-template-columns:.85fr 1.15fr;gap:28px;display:grid}.brain-body-stage{background:radial-gradient(at 50% 35%,#1d3b34,#0b1d1b);border:1px solid #34534a;border-radius:8px;place-items:center;display:grid}.brain-body-stage svg{width:100%;height:390px}.brain-pathway-steps{flex-direction:column;gap:6px;display:flex}.brain-pathway-steps button{text-align:left;background:var(--n-soft);border:1px solid #0000;border-radius:6px;gap:17px;padding:15px 18px;display:flex}.brain-pathway-steps button[aria-pressed=true]{border-color:var(--n-accent);background:var(--n-surface)}.brain-pathway-steps button>span{color:var(--n-accent);padding-top:3px;font:12px monospace}.brain-pathway-steps small{color:var(--n-muted);letter-spacing:.08em;margin-bottom:4px;font-size:8px;display:block}.brain-pathway-steps strong{font-size:13px;font-weight:550;line-height:1.4;display:block}.brain-pathway-steps p{color:var(--n-muted);margin:10px 0 0;font-size:12px}.brain-lab-footer{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:20px;margin-top:24px;display:flex}.brain-lab-actions{flex-wrap:wrap;gap:8px;display:flex}.brain-lab-footer>span{color:var(--n-muted);font-size:10px}.brain-takeaway{background:var(--n-soft);border-radius:6px;grid-template-columns:90px 1fr;gap:20px;margin-top:22px;padding:24px 28px;display:grid}.brain-takeaway>span{color:var(--n-accent);letter-spacing:.12em;padding-top:4px;font-size:10px;font-weight:700}.brain-takeaway p{color:var(--n-muted);max-width:800px;margin:0;font-size:13px}.brain-neuron-stage{background:radial-gradient(at 30%,#24473b,#0c201e);border:1px solid #34534a;border-radius:8px;margin-bottom:22px;padding:18px 12px;overflow:hidden}.brain-neuron-stage svg{width:100%;max-height:290px;display:block}.brain-part-note{min-height:66px;color:var(--n-muted);max-width:860px;margin:19px 0 22px;font-size:13px}.brain-part-note strong{color:var(--n-text)}.brain-neuron-experiment{border-top:1px solid var(--n-line);grid-template-columns:.8fr 1.2fr;gap:34px;padding:32px 0;display:grid}.brain-neuron-experiment h3,.brain-conduction h3{margin:9px 0 15px;font-size:25px}.brain-neuron-experiment p,.brain-conduction p{color:var(--n-muted);font-size:13px}.brain-sliders{gap:20px;margin-top:26px;display:grid}.brain-slider{font-size:11px;display:block}.brain-slider>span{justify-content:space-between;gap:14px;margin-bottom:8px;display:flex}.brain-slider output{font-variant-numeric:tabular-nums;color:var(--n-accent)}.brain-slider input{width:100%;accent-color:var(--n-accent);min-height:24px;display:block}.brain-voltage{align-self:center}.brain-voltage svg{width:100%;display:block;overflow:visible}.brain-voltage svg text{fill:var(--n-muted);font:12px monospace}.brain-readouts{grid-template-columns:repeat(3,1fr);gap:14px;margin-top:22px;display:grid}.brain-readouts div{border-top:1px solid var(--n-line);padding-top:12px}.brain-readouts span{color:var(--n-muted);font-size:9px;display:block}.brain-readouts strong{font-variant-numeric:tabular-nums;margin-top:6px;font-size:26px;font-weight:500;display:block}.brain-details{border-block:1px solid var(--n-line);font-size:13px}.brain-details summary{cursor:pointer;color:var(--n-text);padding:17px 0;line-height:1.5}.brain-details p{color:var(--n-muted);max-width:900px;margin:0 0 20px}.brain-conduction{grid-template-columns:1fr 1fr;gap:45px;padding-top:38px;display:grid}.brain-check{align-items:start;gap:9px;margin-bottom:25px;font-size:12px;display:flex}.brain-check input{accent-color:var(--n-accent);margin-top:4px}.brain-delay{border-top:1px solid var(--n-line);justify-content:space-between;align-items:center;gap:20px;margin-top:24px;padding-top:17px;display:flex}.brain-delay span{color:var(--n-muted);font-size:10px}.brain-delay strong{color:var(--n-accent);white-space:nowrap;font-variant-numeric:tabular-nums;font-size:26px;font-weight:500}.brain-concept-grid{grid-template-columns:repeat(3,1fr);gap:34px;display:grid}.brain-concept-grid article{border-top:1px solid var(--n-line);padding-top:25px}.brain-concept-grid h3{font-size:22px}.brain-checkpoints{margin-top:38px}.brain-checkpoints h3{margin-bottom:24px}.brain-checkpoints .brain-details+.brain-details{border-top:0}.brain-references h2{margin:14px 0;font-size:32px}.brain-references>p{color:var(--n-muted);max-width:680px;font-size:13px}.brain-references ul{grid-template-columns:1fr 1fr;gap:25px 40px;margin:32px 0 0;padding:0;list-style:none;display:grid}.brain-references li{border-top:1px solid var(--n-line);gap:17px;padding-top:17px;display:flex}.brain-references li>span{color:var(--n-muted);padding-top:5px;font:10px monospace}.brain-references a{color:var(--n-accent);font-size:13px}.brain-references li p{color:var(--n-muted);margin:5px 0 0;font-size:11px}.brain-footer{color:var(--n-accent);justify-content:space-between;gap:20px;padding-top:30px;font-size:12px;display:flex}.body-explorer{--t-cns:#8fdbbd;--t-cranial:#c9aded;--t-plexus:#fccc73;--t-arm:#8cc7fa;--t-leg:#f79ea8;--t-trunk:#9ee0e6;margin-top:34px}.body-toolbar{flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:16px 24px;margin-bottom:18px;display:flex}.body-toolbar h3{margin:6px 0 0}.body-switches{flex-wrap:wrap;gap:6px 20px;display:flex}.body-switches .brain-check{white-space:nowrap;margin-bottom:0}.body-grid{grid-template-columns:minmax(0,1fr) 314px;gap:24px;display:grid}.body-stage{background:radial-gradient(at 50% 38%,#26443c 0,#102822 48%,#091b19 92%);border:1px solid #34534a;border-radius:12px;height:640px;position:relative;overflow:hidden}.body-canvas{touch-action:none;cursor:grab;width:100%;height:100%;position:absolute;inset:0}.body-canvas:active{cursor:grabbing}.body-canvas:focus-visible{outline-offset:-5px;outline:3px solid #c3f7df}.body-canvas.is-unavailable{visibility:hidden}.body-fallback{width:100%;height:88%;position:absolute;inset:6% 0}.body-inspector{border:1px solid var(--n-line);background:var(--n-surface);border-radius:8px;align-self:start;padding:26px 24px}.body-inspector .brain-kicker{color:var(--n-muted);font-size:9px}.body-inspector h3{margin:10px 0 12px}.body-inspector>p{font-size:14px}.body-legend{border-top:1px solid var(--n-line);gap:7px;margin:20px 0 16px;padding-top:17px;display:grid}.body-dot{color:var(--n-muted);align-items:center;gap:9px;font-size:11px;display:flex}.body-dot:before{content:"";background:var(--dot);border-radius:50%;flex:none;width:9px;height:9px}.body-dot-cns{--dot:var(--t-cns)}.body-dot-cranial{--dot:var(--t-cranial)}.body-dot-plexus{--dot:var(--t-plexus)}.body-dot-arm{--dot:var(--t-arm)}.body-dot-leg{--dot:var(--t-leg)}.body-dot-trunk{--dot:var(--t-trunk)}.body-controls{flex-wrap:wrap;align-items:center;gap:14px;padding:15px 0 5px;display:flex}.body-controls button{color:var(--n-muted);background:0 0;border:0;min-height:34px;padding:6px 7px;font-size:10px}.body-controls button:hover{color:var(--n-accent);background:var(--n-soft);border-radius:4px}.body-controls label{color:var(--n-muted);align-items:center;gap:8px;font-size:10px;display:flex}.body-controls input{width:78px;accent-color:var(--n-accent)}.body-tracks{border-top:1px solid var(--n-line);grid-template-columns:repeat(auto-fit,minmax(min(100%,196px),1fr));gap:18px 20px;margin-top:22px;padding-top:24px;display:grid}.body-track-group>div{gap:6px;margin-top:10px;display:grid}.body-track{text-align:left;border:1px solid var(--n-line);background:var(--n-surface);width:100%;min-height:40px;color:var(--n-text);border-radius:6px;align-items:center;gap:9px;padding:9px 12px;font-size:12px;display:flex}.body-track i{background:var(--dot);border-radius:50%;flex:none;width:9px;height:9px}.body-track:hover{border-color:var(--dot)}.body-track[aria-pressed=true]{border-color:var(--dot);background:var(--n-soft);box-shadow:inset 3px 0 0 var(--dot);font-weight:600}.body-track-cns{--dot:var(--t-cns)}.body-track-cranial{--dot:var(--t-cranial)}.body-track-plexus{--dot:var(--t-plexus)}.body-track-arm{--dot:var(--t-arm)}.body-track-leg{--dot:var(--t-leg)}.body-track-trunk{--dot:var(--t-trunk)}@media (max-width:1000px){.brain-explorer-grid,.body-grid{grid-template-columns:minmax(0,1fr) 275px;gap:17px}.body-stage{height:560px}.brain-stage{height:460px}.brain-inspector{padding:22px 19px}.brain-stage-head span:last-child{display:none}.brain-region-grid{grid-template-columns:repeat(3,1fr)}.brain-neuron-experiment{grid-template-columns:1fr}.brain-sliders{grid-template-columns:1fr 1fr}}@media (max-width:760px){.brain-page{padding-top:30px}.brain-back{margin-bottom:43px;padding-right:50px}.brain-hero{grid-template-columns:1fr;gap:28px}.brain-hero-note{border-left:0;padding:0}.brain-hero-note .brain-kicker,.brain-hero-note p,.brain-hero-note>span:last-child br{display:none}.brain-hero-note>span:last-child{gap:12px;display:flex}.brain-page-nav{gap:14px 22px}.brain-section{padding-block:58px}.brain-atlas-section{padding-top:32px}.brain-explorer-toolbar{flex-direction:column;align-items:start;gap:20px}.brain-explorer-grid,.body-grid{grid-template-columns:1fr;gap:20px}.body-stage{height:480px}.body-toolbar{align-items:flex-start}.brain-stage{height:470px}.brain-inspector dl{grid-template-columns:150px 1fr;gap:12px 20px;margin-top:20px;display:grid}.brain-inspector dt{margin:0}.brain-inspector h3{font-size:28px}.brain-region-grid{grid-template-columns:repeat(2,1fr)}.brain-system-grid,.brain-reading-grid,.brain-conduction{grid-template-columns:1fr;gap:23px}.brain-direction-strip{gap:24px;padding:24px}.brain-pathway-grid{grid-template-columns:.75fr 1fr;gap:14px}.brain-body-stage svg{height:340px}.brain-pathway-steps button{gap:9px;padding:12px 10px}.brain-lab{padding:22px}.brain-takeaway{grid-template-columns:1fr;gap:9px}.brain-concept-grid{grid-template-columns:1fr;gap:15px}.brain-concept-grid .brain-card-index{margin-bottom:12px}.brain-references ul{grid-template-columns:1fr}}@media (max-width:480px){.brain-stage{height:410px}.brain-stage-head{font-size:7px;inset:17px 14px auto}.brain-stage-caption{font-size:9px;bottom:14px;left:14px}.brain-orientation{width:83px;bottom:27px;right:0}.brain-inspector dl{display:block}.brain-inspector dt{margin:17px 0 6px}.brain-challenge{padding:23px 20px}.brain-direction-strip{grid-template-columns:1fr}.brain-lab{padding:16px}.brain-lab .brain-segment button{padding:9px 11px;font-size:11px}.brain-pathway-grid{grid-template-columns:1fr}.brain-body-stage svg{height:335px}.brain-neuron-stage{padding:14px 2px}.brain-sliders{grid-template-columns:1fr}.brain-readouts strong{font-size:22px}.brain-footer{flex-direction:column}}@media (prefers-reduced-motion:reduce){html:has(.brain-page){scroll-behavior:auto}.brain-page *,.brain-page :before,.brain-page :after{transition:none!important;animation:none!important}}