@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Space+Grotesk:wght@400;500;600;700&display=swap');
:root{color-scheme:dark;--bg:#080d18;--panel:#101827;--line:#263348;--muted:#a9b7cb;--ink:#f1f5fc;--mint:#65ead4;--pink:#ff748c;--blue:#77a6ff}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 'DM Sans',sans-serif}button,input,select{font:inherit}button,a,input,select{touch-action:manipulation}a{color:inherit;text-underline-offset:4px}button,select{min-height:44px;border:1px solid var(--line);background:#152035;color:var(--ink);border-radius:7px;padding:9px 13px;cursor:pointer}button:hover,select:hover{border-color:var(--mint)}button[aria-pressed=true],button.selected{background:#153d3b;border-color:var(--mint);color:#9affeb}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--mint);outline-offset:4px}button:disabled{opacity:.45;cursor:not-allowed}header{max-width:1512px;margin:auto;padding:25px 42px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);font-size:14px}.brand{display:flex;align-items:center;gap:12px;font-size:12px;font-weight:700;line-height:1.1;letter-spacing:1.8px;text-decoration:none}.brandmark{font-size:23px;letter-spacing:-2px;border:1px solid #4b6975;border-radius:50%;width:46px;height:46px;display:flex;align-items:center;justify-content:center}.brandmark span{color:var(--mint);font-size:17px}.header-note{color:var(--muted)}main{max-width:1512px;margin:auto;padding:30px 42px 64px}.title-row{display:flex;justify-content:space-between;align-items:end;margin-bottom:30px;gap:20px}.eyebrow{font-size:12px;letter-spacing:1.7px;font-weight:700;color:var(--muted);margin:0 0 10px}h1,h2,h3,.footer-name{font-family:'Space Grotesk',sans-serif;line-height:1.16;font-weight:500}h1{font-size:clamp(32px,3.4vw,51px);margin:0;letter-spacing:-1.8px}h1 em{font-style:normal;color:var(--mint)}.title-meta{text-align:right;display:grid;gap:4px;flex-shrink:0}.title-meta strong{font:500 21px 'Space Grotesk',sans-serif}.title-meta span{font-size:12px;color:var(--muted)}.lab-tabs{display:flex;gap:30px;border-bottom:1px solid var(--line);margin-bottom:20px}.lab-tabs button{background:none;border:0;border-radius:0;padding:15px 0;border-bottom:2px solid transparent;color:var(--muted);font-weight:600}.lab-tabs button span{color:#73839d;font-size:12px;margin-right:9px}.lab-tabs button[aria-current=page]{color:var(--mint);border-color:var(--mint)}.workspace{display:grid;grid-template-columns:minmax(0,1fr) 310px;border:1px solid var(--line);border-radius:12px;overflow:hidden;background:#090f1b}.scene-wrap{min-width:0}.scene-heading{display:flex;justify-content:space-between;align-items:center;padding:24px 26px 0;gap:15px}.scene-heading .eyebrow{font-size:11px;color:var(--mint);margin-bottom:8px}.scene-heading 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var(--line);padding:24px}.control-top{display:flex;justify-content:space-between;font-size:12px;color:var(--muted);margin-bottom:20px}.control-top .eyebrow{font-size:11px}.controls h3{font-size:23px;margin:0 0 8px}.controls p{font-size:14px;color:var(--muted);margin:8px 0 18px}.control{display:block;margin:21px 0}.control>span{display:flex;justify-content:space-between;gap:12px;font-size:14px;margin-bottom:8px}.control output{color:var(--mint);font-variant-numeric:tabular-nums}.control input[type=range]{width:100%;accent-color:var(--mint);height:24px;cursor:pointer}.control select{width:100%;font-size:14px}.button-row{display:flex;gap:8px;margin:12px 0}.button-row button{flex:1;font-size:14px}.wide{width:100%;margin-top:8px}.primary{background:var(--mint);color:#07231f;border-color:var(--mint);font-weight:700}.notice{border-top:1px solid var(--line);padding-top:18px;margin-top:23px;font-size:14px;line-height:1.65;color:#c6d6e6}.notice strong{color:var(--mint)}.learning-row{display:grid;grid-template-columns:1fr 1fr;gap:0;margin:26px 0 60px;border:1px solid var(--line);border-radius:10px;overflow:hidden}.prediction,.equation{padding:27px 30px}.prediction{background:#0d1522;border-right:1px solid var(--line)}.learning-row h2{font-size:23px;margin:6px 0 20px}.answers{display:flex;gap:8px;flex-wrap:wrap}.answers button{font-size:14px}.prediction>p:not(.eyebrow),.equation>p{color:var(--muted);font-size:14px;min-height:45px}.text-button{border:0;background:none;padding:0;color:var(--mint);font-size:14px;text-decoration:underline}.equation #formula{display:flex;align-items:center;gap:6px;flex-wrap:wrap;font:500 30px 'Space Grotesk',sans-serif;margin:20px 0}.equation #formula button{font:inherit;padding:3px 10px;min-width:45px;background:transparent;border:1px solid #3b5064;color:var(--mint)}details{font-size:14px;color:var(--muted)}summary{cursor:pointer;min-height:44px;padding:10px 0;color:var(--ink)}details p{line-height:1.8}.section-heading h2{font-size:34px;margin:12px 0 32px;letter-spacing:-.7px}.takeaways{display:grid;grid-template-columns:repeat(3,1fr);gap:35px}.takeaways article{border-top:1px solid #38534f;padding:22px 0}.takeaways article>span{color:var(--mint);font-size:12px;letter-spacing:1px}.takeaways h3{font-size:24px;max-width:300px}.takeaways p{color:var(--muted)}.transfer{display:grid;grid-template-columns:1fr 1fr;gap:35px;padding:30px;background:#112227;border:1px solid #2c4b4d;border-radius:10px;margin:26px 0 40px}.transfer h3{font-size:24px;margin:8px 0}.transfer p:not(.eyebrow){font-size:14px;color:var(--muted)}.notes{display:grid;grid-template-columns:1fr 1fr;gap:0 35px}.notes details{border-bottom:1px solid var(--line);padding:8px 0}.check{display:flex;gap:12px;align-items:center}.check input{width:22px;height:22px;accent-color:var(--mint)}footer{border-top:1px solid var(--line);padding:40px 42px;display:grid;grid-template-columns:1fr 1.5fr;gap:18px 50px;max-width:1512px;margin:auto}.footer-name{font-size:26px;text-decoration:none}footer p{margin:0;font-size:14px;color:var(--muted)}footer nav{grid-column:1/-1;display:flex;flex-wrap:wrap;gap:18px;font-size:13px;color:var(--muted);margin-top:12px}.skip{position:absolute;left:15px;top:-100px;padding:15px;background:var(--mint);color:#000;z-index:100}.skip:focus{top:10px}[hidden]{display:none!important}@media(min-width:1600px){main{padding-top:40px}}@media(max-width:1050px){header,main{padding-left:24px;padding-right:24px}.title-row{align-items:start}.title-meta{max-width:210px}.workspace{grid-template-columns:minmax(0,1fr) 270px}.controls{padding:20px}.scene-heading{padding:20px 18px 0}.scene-heading h2{font-size:18px}.live-tag{display:none}.scene-toolbar{padding:12px}.readout{padding:16px 12px}.readout strong{font-size:20px}}@media(max-width:780px){.title-row{display:block}.title-meta{text-align:left;max-width:none;margin-top:17px;display:flex;justify-content:space-between;align-items:center}.title-meta strong{font-size:16px}.header-note{display:none}.workspace{grid-template-columns:1fr}.controls{border-left:0;border-top:1px solid var(--line)}.control-top{margin-bottom:12px}#controls{display:grid;grid-template-columns:1fr 1fr;gap:0 22px}#controls>h3,#controls>p,#controls>.wide,#controls>.button-row{grid-column:1/-1}.control{margin:13px 0}.learning-row{grid-template-columns:1fr}.prediction{border-right:0;border-bottom:1px solid var(--line)}.takeaways{gap:20px}.takeaways h3{font-size:21px}.transfer{grid-template-columns:1fr;gap:20px}.notes{grid-template-columns:1fr}.scene-heading h2{font-size:20px}footer{grid-template-columns:1fr;padding:32px 24px}.lab-tabs{gap:22px}.lab-tabs button{font-size:14px}}@media(max-width:520px){header{padding:18px}main{padding:25px 14px 40px}.title-row{margin-bottom:22px}.title-meta{display:block}.title-meta span{display:block;margin-top:3px}h1{font-size:36px;letter-spacing:-1px}.lab-tabs{gap:0;justify-content:space-between}.lab-tabs button{font-size:13px;width:32%;text-align:left;line-height:1.4}.lab-tabs button span{display:block;margin-bottom:4px}.scene-heading{padding:18px 16px 5px}.scene-heading h2{font-size:18px}.scene-toolbar{justify-content:center}.scene-help{font-size:12px}.readout{padding:14px 10px}.readout strong{font-size:19px}.readout span,.readout small{font-size:12px}.learning-row{margin-bottom:42px}.prediction,.equation{padding:23px 20px}.takeaways{grid-template-columns:1fr;gap:0}.takeaways article{padding:20px 0}.takeaways h3{max-width:none;margin:12px 0}.takeaways p{margin-bottom:0}.section-heading h2{font-size:30px}.transfer{padding:23px 20px}.control-top .eyebrow{font-size:12px}.controls{padding:21px}.scene-toolbar button{font-size:12px}.scene-wrap{overflow:hidden}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

.signal-challenge{grid-column:1/-1;margin-top:20px;border:1px solid #2d655c;border-radius:9px;padding:18px;background:#102b2b;display:grid;gap:6px}.signal-challenge .eyebrow{color:#a7e9da;margin:0;font-size:12px}.signal-challenge strong{font:500 30px 'Space Grotesk',sans-serif;color:#8affdf}.signal-challenge>span:not(.eyebrow){font-size:14px;color:#c1d7d4}.signal-challenge button{text-align:left}canvas:focus-visible{outline:3px solid var(--mint);outline-offset:-4px}