:root{color-scheme:dark;--bg:#111214;--panel:#18191c;--line:#303136;--muted:#95959d;--ink:#eeede8;--accent:#e6dfa5;--mono:ui-monospace,SFMono-Regular,Consolas,monospace;font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--bg);font-synthesis:none}
*{box-sizing:border-box}body{margin:0}button,input,a{-webkit-tap-highlight-color:transparent}button,input{font:inherit}button,a,input{outline-offset:5px}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:2px solid var(--accent)}button{cursor:pointer}button:disabled{cursor:wait;opacity:.45}a{color:inherit;text-decoration:none}a:hover{color:var(--accent)}button{color:inherit}button:active{transform:translateY(1px)}button[aria-pressed=true]{border-color:#bdb98d;background:#333329;color:#f2edc9}button,summary{touch-action:manipulation}input{min-width:0}input[type=range]{width:100%;accent-color:var(--accent);height:15px;cursor:pointer}.app-shell{max-width:1264px;margin:0 auto;padding:0 48px}.masthead{height:93px;display:flex;align-items:center;border-bottom:1px solid var(--line);gap:18px}.brand{font-weight:680;font-size:25px;letter-spacing:-1px;display:flex;align-items:center;gap:9px}.brand-dot{color:var(--accent)}.edition{font:9px var(--mono);letter-spacing:1.5px;color:var(--muted);margin-left:10px}.quiet-link{margin-left:auto;font-size:12px;color:#bdbdc3}.quiet-link span{margin-left:14px}.intro{display:flex;justify-content:space-between;align-items:flex-end;margin:38px 0 29px}.eyebrow,.section-label{font:10px var(--mono);letter-spacing:1.4px;color:var(--muted)}.eyebrow{margin:0 0 11px;color:#b1ac8b}h1{font-size:42px;font-weight:460;letter-spacing:-1.7px;line-height:1.15;margin:0}.intro>p{font-size:12px;line-height:1.8;color:#a7a7af;margin:0 0 2px}.instrument{border:1px solid #36373b;border-radius:13px;background:var(--panel);overflow:hidden;box-shadow:0 18px 65px #0003}.instrument-top{height:42px;padding:0 22px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);font:9px var(--mono);letter-spacing:1px;color:#a8a8af}.instrument-top>span:first-child{display:flex;align-items:center;gap:8px}.status-dot{width:5px;height:5px;border-radius:50%;background:#74777b}.status-dot.ready{background:#b8c68c;box-shadow:0 0 8px #b8c68c60}.visual-grid{display:grid;grid-template-columns:minmax(0,1.75fr) minmax(290px,1fr);border-bottom:1px solid var(--line)}.light-screen{position:relative;min-height:318px;background:#08090b;overflow:hidden;display:flex;flex-direction:column;isolation:isolate}.light-screen:before{content:"";position:absolute;inset:0;background-image:linear-gradient(#ffffff04 1px,transparent 1px),linear-gradient(90deg,#ffffff04 1px,transparent 1px);background-size:32px 32px;z-index:-1}.screen-top,.screen-bottom{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:20px 22px;font:9px var(--mono);letter-spacing:.9px;color:#a5a5ae;position:relative;z-index:1}.screen-top #color-hex{letter-spacing:.3px;color:#bbbbc2}.light-field{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;z-index:-1;opacity:0;transition:opacity .15s}.light-field.active{opacity:1}.light-orb{width:160px;height:160px;border-radius:50%;background:var(--light,#000);box-shadow:0 0 70px 25px var(--light,#000),0 0 140px 55px var(--light,#000);filter:blur(14px);opacity:.9}.product-area{flex:1;display:flex;align-items:center;justify-content:center;flex-direction:column;text-align:center;padding:18px 20px;text-shadow:0 2px 20px #000,0 1px 5px #000}.number-label{font:9px var(--mono);letter-spacing:2px;margin:0 0 11px;color:#c8c8ce}#product{font:400 57px var(--mono);line-height:1.14;letter-spacing:-2.5px;max-width:100%;overflow-wrap:anywhere;color:#fff}#product.medium{font-size:35px;letter-spacing:-1px}#product.long{font-size:20px;letter-spacing:-.3px;max-height:100px;overflow:auto;width:100%}.factorization{font:11px var(--mono);line-height:1.8;color:#d3d3db;max-width:100%;max-height:60px;overflow:auto;margin:14px 0 0}.screen-bottom{margin-top:auto;padding-top:10px;letter-spacing:0;color:#b7b7bf;text-shadow:0 1px 3px #000}.text-button{border:0;background:#10111480;font:10px var(--mono);padding:6px 8px;border-radius:4px}.text-button span{margin-left:9px}.spectrum-panel{padding:22px 23px 15px;border-left:1px solid var(--line);min-width:0}.panel-heading{display:flex;justify-content:space-between;font:9px var(--mono);letter-spacing:1px;color:#bfc0c6}.panel-heading span:last-child{color:#777981}.small-description{font-size:11px;color:var(--muted);margin:10px 0 2px}#spectrum{display:block;width:100%;height:125px;overflow:visible}#spectrum text{font:8px var(--mono);fill:#8b8c94}#spectrum line.grid{stroke:#ffffff0a;stroke-width:1}#spectrum-lines line{stroke-width:2;stroke-linecap:round}.spectrum-ramp{height:3px;opacity:.7;border-radius:2px;margin:0 8px}.axis-labels{display:flex;justify-content:space-between;font:7px var(--mono);color:#84858d;letter-spacing:.2px;margin:7px 8px 17px}.readouts{border-top:1px solid var(--line);padding-top:9px;margin:0}.readouts>div{display:flex;justify-content:space-between;gap:8px;font-size:10px;line-height:2.1}.readouts dt{color:#9698a1}.readouts dd{margin:0;font-family:var(--mono);color:#d1d0d8}.gamut-note{font:8px var(--mono);color:#9a9788;margin:11px 0 0;line-height:1.5}.keyboard-top{padding:21px 24px 18px;display:flex;align-items:center;justify-content:space-between;gap:12px}.keyboard-top>div:first-child{display:flex;gap:16px;align-items:center}.key-hint{font-size:10px;color:#898a93}.transport{display:flex;gap:7px}.transport button{background:#222327;border:1px solid #3c3d44;border-radius:5px;padding:7px 9px;font-size:10px;white-space:nowrap}.transport button:hover{background:#303136}.transport button[aria-pressed=true]{background:#34332a;border-color:#aaa57f}.button-state{color:#93949d;margin-left:3px}.transport button[aria-pressed=true] .button-state{color:var(--accent)}kbd{font:8px var(--mono);color:#aaabb4;border:1px solid #4b4c53;border-radius:3px;padding:2px 4px;margin-left:4px}.keyboard{padding:0 30px 3px;user-select:none;touch-action:none}.key-row{display:flex;gap:7px;justify-content:center;margin:0 auto 8px}.key-row:nth-child(2){padding:0 4.7%}.key-row:nth-child(3){padding:0 14.2%}.key{--key-color:#888;flex:1;min-width:0;height:78px;position:relative;display:flex;flex-direction:column;align-items:flex-start;justify-content:center;padding:10px 13px;border:1px solid color-mix(in srgb,var(--key-color) 32%,#45464e);border-bottom:3px solid color-mix(in srgb,var(--key-color) 58%,#24252c);border-radius:6px;background:linear-gradient(150deg,color-mix(in srgb,var(--key-color) 13%,#26272b),color-mix(in srgb,var(--key-color) 4%,#1c1d22));box-shadow:0 3px 0 #0b0c0e,0 4px 6px #0003;touch-action:none;transition:background .08s,box-shadow .08s,transform .08s}.key:hover{background:color-mix(in srgb,var(--key-color) 24%,#26272b)}.key.active{transform:translateY(2px);box-shadow:0 0 18px color-mix(in srgb,var(--key-color) 25%,transparent);background:color-mix(in srgb,var(--key-color) 38%,#292a30);border-color:color-mix(in srgb,var(--key-color) 85%,white)}.key-letter{font:10px var(--mono);color:#b9bac1;margin-bottom:7px}.key-prime{font:22px var(--mono);line-height:1;color:color-mix(in srgb,var(--key-color) 45%,#fff);letter-spacing:-.5px}.key-note{position:absolute;right:9px;bottom:12px;font:8px var(--mono);color:#a0a0ad}.key-exponent{position:absolute;right:8px;top:7px;font:10px var(--mono);color:white}.keyboard-bottom{padding:13px 30px 23px;display:flex;justify-content:space-between;gap:12px;font:9px var(--mono);color:#94959f;min-height:47px}.hint-divider{padding:0 5px;color:#575961}.below-instrument{display:grid;grid-template-columns:1fr 1fr;gap:35px;margin:28px 0}.experiments h2{font-size:12px;font-weight:500;display:flex;align-items:center;gap:14px;margin:0 0 13px}.experiments h2>span{font:8px var(--mono);letter-spacing:.8px;color:#7e7f89}.presets{display:flex;gap:8px}.presets button{flex:1;display:grid;grid-template-columns:11px 1fr 8px;align-items:center;column-gap:8px;row-gap:5px;background:#1a1b1e;border:1px solid #33343a;border-radius:6px;text-align:left;padding:12px 10px;font-size:10px;white-space:nowrap}.presets button:hover{border-color:#6b6b70;background:#222326}.preset-formula{font:8px var(--mono);grid-row:2;grid-column:2/4;color:#90919b}.presets button>span:last-child{grid-column:3;grid-row:1;color:#8c8c95}.preset-dot{height:8px;width:8px;border-radius:50%}.ember{background:#f99550;box-shadow:0 0 8px #f9955060}.violet{background:#c082d1;box-shadow:0 0 8px #c082d160}.daylight{background:#d8d5c5;box-shadow:0 0 8px #d8d5c560}.controls{display:flex;gap:25px;align-items:center}.controls label{flex:1;font-size:10px;color:#a9a9b1;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:13px 6px}.controls output{font:9px var(--mono);color:#d1cfba}.controls input{margin:0}.number-explorer{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:25px 0;display:grid;grid-template-columns:1fr 1fr;column-gap:35px;align-items:center}.number-explorer h2{font-size:15px;font-weight:450;letter-spacing:-.3px;margin:0 0 8px}.number-explorer p{font-size:11px;color:#92939c;margin:0;line-height:1.6}.number-explorer form{display:flex;gap:8px}.number-explorer input{flex:1;width:100px;background:#1b1c20;color:#ededf0;border:1px solid #37383e;border-radius:5px;padding:11px 13px;font:11px var(--mono)}.number-explorer input::placeholder{color:#757681}.number-explorer button{background:var(--accent);color:#292a20;border:0;border-radius:5px;padding:11px 14px;white-space:nowrap;font-size:11px}.number-explorer button span{margin-left:12px}#form-message:not(:empty){grid-column:1/-1;margin-top:12px;color:#dfc28f}.math{margin:9px 0 19px}.math summary{cursor:pointer;display:flex;align-items:center;justify-content:space-between;padding:22px 0;font-size:13px;list-style:none}.math summary::-webkit-details-marker{display:none}.math-symbol{font:22px Georgia,serif;color:#b9b7a4;margin-right:11px}.details-hint{font:8px var(--mono);letter-spacing:1px;color:#90919b}.details-hint>span{margin-left:24px;font-size:15px}.math[open] .details-hint>span{display:inline-block;transform:rotate(45deg)}.math-content{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;padding:5px 0 20px}.math article h3{font:12px var(--mono);color:#d5d3ba;margin:0 0 17px}.math article p{font-size:12px;color:#a7a8b1;line-height:1.8}.equation{font:15px var(--mono);line-height:2;overflow-wrap:anywhere;padding:15px;background:#1c1d21;border-left:2px solid #77765a}.math .sources{grid-column:1/-1;font-size:10px;line-height:1.8;color:#888a94}.sources a{text-decoration:underline;text-underline-offset:3px}.app-message{font-size:12px;color:#d9bd8f}.app-message:empty{display:none}footer{border-top:1px solid var(--line);display:flex;align-items:center;gap:25px;padding:25px 0 32px;font:9px var(--mono);color:#8d8e98}footer>span{font-size:8px;letter-spacing:1px;margin-right:auto}footer a{font-size:9px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@media(min-width:1500px){.app-shell{padding-top:10px}.intro{margin-top:48px}.light-screen{min-height:350px}.key{height:85px}}
@media(max-width:1050px){.app-shell{padding:0 28px}.key-hint{display:none}.below-instrument{grid-template-columns:1fr;gap:23px}.controls{max-width:600px}.key{padding:9px}.key-note{font-size:7px;right:5px}.number-explorer{grid-template-columns:1fr 1.1fr;gap:20px}.presets{max-width:600px}}
@media(max-width:720px){.app-shell{padding:0 18px}.masthead{height:72px}.brand{font-size:23px}.edition{display:none}.intro{margin:28px 0 23px;display:block}h1{font-size:35px}.intro>p{margin-top:13px;font-size:11px}.intro>p br{display:none}.intro>p br:after{content:' '}.instrument-top{font-size:7px;padding:0 14px;height:35px;letter-spacing:.6px}.visual-grid{grid-template-columns:1fr}.light-screen{min-height:270px}.screen-top,.screen-bottom{padding:16px;font-size:8px}.spectrum-panel{border-left:0;border-top:1px solid var(--line);padding:17px 17px 14px;display:grid;grid-template-columns:1fr 1fr;gap:0 20px}.panel-heading{grid-column:1/-1;font-size:8px}.small-description{grid-column:1/-1;font-size:10px;margin-bottom:10px}#spectrum{height:85px;grid-column:1;grid-row:3}.spectrum-ramp{grid-column:1;grid-row:4}.axis-labels{grid-column:1;font-size:6px;margin:5px 5px 0}.readouts{grid-column:2;grid-row:3/6;border-top:0;padding:0;align-self:center}.readouts>div{display:block;font-size:9px;line-height:1.7;margin-bottom:4px}.readouts dd{font-size:10px}.gamut-note{grid-column:1/-1;font-size:7px;margin-top:9px}.keyboard-top{padding:18px 12px 16px;gap:5px;flex-wrap:wrap}.section-label{font-size:8px;letter-spacing:.8px}.transport{gap:5px}.transport button{font-size:9px;padding:7px}.transport kbd{display:none}.keyboard{padding:0 9px}.key-row{gap:4px;margin-bottom:7px}.key{height:66px;padding:8px 5px;border-radius:4px}.key-letter{font-size:8px;margin-bottom:8px}.key-prime{font-size:16px}.key-note{display:none}.key-exponent{font-size:8px;top:6px;right:3px}.keyboard-bottom{padding:12px 13px 17px;font-size:8px;min-height:46px}.keyboard-bottom>span:last-child{display:none}.experiments h2{font-size:12px}.presets{gap:6px}.presets button{padding:10px 8px;font-size:9px;column-gap:5px;grid-template-columns:8px 1fr 8px}.preset-formula{font-size:7px}.controls{gap:20px}.controls label{font-size:9px}.number-explorer{grid-template-columns:1fr;gap:18px;padding:23px 0}.number-explorer form{width:100%}.number-explorer input{font-size:10px}.number-explorer button{font-size:10px;padding:10px}.math summary{font-size:11px}.details-hint{font-size:7px;letter-spacing:.5px}.details-hint>span{margin-left:6px}.math-content{grid-template-columns:1fr;gap:15px}.math .sources{margin:0}footer{flex-wrap:wrap;gap:14px;padding:20px 0}footer>span{width:100%;font-size:7px}footer a{font-size:8px}.below-instrument{margin:24px 0}#product{font-size:46px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{transition:none!important;scroll-behavior:auto!important}}
.audio-hint{margin:-5px 24px 17px;font-size:10px;line-height:1.5;color:#aaa9a0}.keyboard:focus-visible{outline:1px solid #b9b38a;outline-offset:-2px;border-radius:7px}.transport #sound{border-color:#8b8867;color:#e6dfa5}.key-letter{font-weight:650;color:#e1e0e5}@media(max-width:720px){.audio-hint{margin:0 13px 15px;font-size:9px}.keyboard-top{padding-bottom:10px}}