@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;450;500;550;600;650;700&display=swap');
:root{color-scheme:dark;--bg:#080c16;--ink:#f1f3fa;--muted:#9eabc6;--line:#2b3447;--gold:#ffd166;--pink:#ef77bb;--cyan:#79e0ef}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.5 'DM Sans',system-ui,sans-serif}button,input,a{-webkit-tap-highlight-color:transparent}button,input{font:inherit}button,a{touch-action:manipulation}button{cursor:pointer;color:inherit;background:none;border:1px solid var(--line);border-radius:9px;padding:10px 14px}button:hover{background:#ffffff0a;border-color:#63718e}button:focus-visible,a:focus-visible,input:focus-visible{outline:2px solid var(--gold);outline-offset:4px}a{color:inherit;text-decoration:none}button:disabled{cursor:default;opacity:.4}header{height:76px;padding:0 38px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line)}.brand{font-size:29px;font-weight:600;display:flex;align-items:center;gap:17px;letter-spacing:-.8px}.brand-icon{width:41px;height:41px;display:grid;place-items:center;border:1.5px solid var(--gold);border-radius:50%}.brand-icon:before,.brand-icon i{content:'';position:absolute;width:29px;height:29px;border:1px solid var(--gold);border-radius:50%}.brand-icon i{width:13px;height:13px;box-shadow:0 0 12px #ffd16640}header nav{display:flex;gap:34px;align-items:center;color:var(--muted);font-size:15px}header nav button{border:0;padding:8px 0}main{display:grid;grid-template-columns:minmax(0,2.25fr) minmax(310px,1fr);max-width:1800px;margin:auto;min-height:calc(100svh - 76px)}.visual-panel{padding:0 38px 20px;min-width:0;background:radial-gradient(ellipse at 50% 42%,#19213744,transparent 66%)}.tabs{display:flex;gap:21px;height:60px;border-bottom:1px solid var(--line);align-items:stretch}.tabs button{border:0;border-bottom:2px solid transparent;border-radius:0;padding:14px 12px;color:var(--muted)}.tabs button[aria-pressed=true]{color:var(--ink);border-bottom-color:var(--gold)}.scene{position:relative;height:clamp(330px,51vh,610px);min-height:330px}#orbits{width:100%;height:100%;display:block}.readout{position:absolute;left:4px;top:20px;pointer-events:none}.readout strong{font-size:clamp(40px,5.6vw,77px);line-height:1.05;letter-spacing:-3px;font-weight:600;font-variant-numeric:tabular-nums}.readout #unit{font-size:24px;color:var(--muted);margin-left:10px}.readout #note{font-size:20px;color:var(--muted)}.ratio-readout{position:absolute;right:5px;top:25px;font-size:clamp(22px,3.5vw,43px);letter-spacing:2px;pointer-events:none}.voice-values{position:absolute;bottom:3px;left:0;right:0;text-align:center;color:var(--muted);font-size:14px;font-variant-numeric:tabular-nums}.scale-wrap{position:relative;margin-top:15px}#scale{display:block;width:100%;height:104px}.piano{margin-left:43.36%;height:31px;display:flex;gap:1px;position:relative}.piano span{flex:1;background:#a6b0c3;border-radius:0 0 2px 2px;border:1px solid #080c16;position:relative}.piano span.black:after{content:'';position:absolute;z-index:1;left:-40%;width:70%;height:64%;background:#080c16;border:1px solid #4c5668;border-radius:0 0 2px 2px}.piano span.active{background:var(--key-color);box-shadow:0 0 9px color-mix(in srgb,var(--key-color),transparent 65%)}.caption{text-align:center;padding:27px 0 7px;min-height:113px}.caption h1{font-size:clamp(20px,2.1vw,29px);font-weight:450;line-height:1.3;margin:0 0 8px}.caption p{font-size:14px;color:var(--muted);margin:0}aside{border-left:1px solid var(--line);padding:34px 30px 22px;display:flex;flex-direction:column;gap:22px;min-width:0}.journey-switch{display:flex;padding:3px;border:1px solid #3d4960;border-radius:12px}.journey-switch button{flex:1;border:0;color:var(--muted);font-size:15px}.journey-switch button[aria-pressed=true]{background:#1c2639;color:var(--ink);box-shadow:0 2px 12px #0005}.transport{display:flex;gap:12px}.primary{background:var(--gold);border-color:var(--gold);color:#101016;font-size:22px;font-weight:650;flex:1;height:63px}.primary:hover{background:#ffdc8b;border-color:#ffdc8b}.primary span:first-child{margin-right:10px}.icon-button{width:61px;font-size:30px;color:var(--muted)}#status{margin:-15px 0 0;font-size:12px;color:var(--muted);min-height:18px}.control{margin-top:3px}.control-label{display:flex;justify-content:space-between;gap:10px;margin-bottom:12px;font-size:16px}.control-label output,.control-label>span{color:var(--muted);font-variant-numeric:tabular-nums}input[type=range]{appearance:none;width:100%;height:24px;background:transparent;cursor:pointer;margin:0;touch-action:pan-y}input[type=range]::-webkit-slider-runnable-track{height:3px;background:#6a7895;border-radius:2px}input[type=range]::-webkit-slider-thumb{appearance:none;width:19px;height:19px;background:var(--gold);border:1px solid #ffe3a1;border-radius:50%;margin-top:-8px;box-shadow:0 0 0 3px #ffd16608}input[type=range]::-moz-range-track{height:3px;background:#6a7895}input[type=range]::-moz-range-thumb{width:18px;height:18px;background:var(--gold);border:0;border-radius:50%}.ticks{display:flex;justify-content:space-between;font-size:12px;color:var(--muted);margin-top:2px}.presets,.patterns,.layers,.chapters{display:flex;gap:7px;margin-top:16px}.presets button{flex:1;padding:7px 2px;font-size:14px;background:#101724}.presets button.selected,.patterns button[aria-pressed=true]{color:var(--gold);border-color:var(--gold);background:#ffd1660b}.patterns button{flex:1;font-size:15px;padding:8px 4px}.explain{border-top:1px solid var(--line);padding-top:23px;margin-top:6px}.explain h2{font-size:20px;font-weight:500;line-height:1.4;margin:0 0 11px}.explain p{font-size:15px;line-height:1.7;color:var(--muted);margin:0}footer{margin-top:auto;padding-top:10px;text-align:right;color:var(--muted);font-size:12px}footer a:hover{text-decoration:underline}.layers{display:grid;grid-template-columns:repeat(2,1fr);margin-top:0}.layers button{color:var(--muted);font-size:14px}.layers button[aria-pressed=true]{border-color:#71839d;color:var(--ink);background:#1c2639}.layers button[aria-pressed=false]{text-decoration:line-through;opacity:.55}.chord-sequence{display:flex;gap:8px;justify-content:space-between;margin-top:15px;color:var(--muted)}.chord-sequence span{padding:4px 11px;border-bottom:1px solid transparent}.chord-sequence span.current{color:var(--gold);border-color:var(--gold)}.chapters{margin-top:4px}.chapters button{font-size:12px;padding:5px;flex:1;border:0;color:var(--muted)}[hidden]{display:none!important}dialog{background:#101724;color:var(--ink);border:1px solid #46516a;border-radius:16px;max-width:630px;width:calc(100% - 32px);max-height:85svh;padding:25px 30px;font-size:15px;line-height:1.7}dialog::backdrop{background:#000b;backdrop-filter:blur(6px)}dialog h2{font-size:24px;margin:0}dialog h3{font-size:18px;margin-top:25px}.dialog-head{display:flex;justify-content:space-between;align-items:center;gap:15px}.dialog-head button{border:0}dialog .subtle{font-size:13px;color:var(--muted)}
@media(min-width:1450px){aside{padding:38px}.scene{height:590px}}@media(max-width:1000px){main{grid-template-columns:minmax(0,1.6fr) 310px}.visual-panel{padding:0 22px 16px}aside{padding:26px 20px;gap:20px}.scene{height:430px}.readout strong{font-size:48px}.readout #unit{font-size:18px}.ratio-readout{font-size:26px}.caption{min-height:122px}.explain h2{font-size:18px}}
@media(max-width:730px){header{height:61px;padding:0 20px}.brand{font-size:23px;gap:12px}.brand-icon{width:31px;height:31px}.brand-icon:before{width:21px;height:21px}.brand-icon i{width:9px;height:9px}header nav{gap:18px;font-size:12px}header nav button{font-size:12px}main{display:flex;flex-direction:column}.visual-panel{padding:0 20px}.tabs{height:48px;gap:6px;justify-content:space-between}.tabs button{font-size:14px;padding:10px 12px}.scene{height:330px;min-height:280px}.readout{top:15px}.readout strong{font-size:46px;letter-spacing:-2px}.readout #unit{font-size:16px}.readout #note{font-size:14px}.ratio-readout{font-size:25px;top:20px}.voice-values{font-size:12px;bottom:0}#scale{height:85px}.scale-wrap{margin-top:7px}.piano{height:22px}.caption{padding:20px 0 16px;min-height:97px}.caption h1{font-size:22px}.caption p{font-size:12px}aside{border-left:0;border-top:1px solid var(--line);padding:20px;gap:20px}.transport{order:-1}.primary{height:52px;font-size:19px}.icon-button{height:52px;width:54px;font-size:26px}#status{margin-top:-12px}.journey-switch{margin-top:-6px}.explain{padding-top:20px}.control-label{font-size:15px}.explain p{font-size:14px}footer{text-align:center;padding:12px 0 8px}dialog{padding:20px}dialog h2{font-size:22px}}@media(max-height:760px) and (min-width:731px){aside{gap:15px;padding-top:24px}.scene{height:360px;min-height:320px}.caption{padding-top:17px}.explain{padding-top:16px}.primary{height:54px}.control-label{margin-bottom:8px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto}}

/* Every semitone has a real highlightable key on the logarithmic pitch reference. */
.piano span.black{background:#121725;height:65%;border-color:#546078;border-radius:0 0 2px 2px}.piano span.black:after{display:none}.piano span.black.active{background:var(--key-color)}

#speedControl .ticks{position:relative;height:18px}#speedControl .ticks span{position:absolute;top:0}

.scene{touch-action:none;user-select:none}.canvas-tools{display:flex;gap:8px;align-items:center;justify-content:center;margin:10px 0 0}.canvas-tools button{font-size:13px;padding:7px 12px}.canvas-tools span{font-size:12px;color:var(--muted);margin-left:7px}.gesture-hint{text-align:center;color:var(--muted);font-size:12px;margin:9px 0 0}.scale-wrap{margin-top:4px}#scale{touch-action:none;cursor:crosshair}#noteHandles{position:absolute;inset:0;pointer-events:none}.note-handle{position:absolute;pointer-events:auto;transform:translate(-50%,-50%);width:44px;height:44px;border:0;padding:0;border-radius:50%;background:transparent;touch-action:none;cursor:grab;z-index:3}.note-handle:before{content:'';position:absolute;width:14px;height:14px;border:2px solid var(--note-color);background:var(--bg);border-radius:50%;inset:15px;box-shadow:0 0 15px color-mix(in srgb,var(--note-color),transparent 40%)}.note-handle.selected:before{background:var(--note-color);box-shadow:0 0 0 5px color-mix(in srgb,var(--note-color),transparent 82%),0 0 18px var(--note-color)}.note-handle.muted{opacity:.45}.note-handle:active{cursor:grabbing}.note-handle span{position:absolute;top:-7px;left:50%;transform:translateX(-50%);white-space:nowrap;background:#080c16dd;color:var(--note-color);font-size:12px;padding:1px 5px;border-radius:4px;line-height:1.3}.note-handle:hover{background:#ffffff09}.note-list{display:flex;gap:7px;flex-wrap:wrap}.note-chip{display:flex;gap:7px;align-items:center;padding:7px 9px;font-size:13px;border-color:#3c4557}.note-chip span{width:6px;height:6px;border-radius:50%;background:var(--note-color)}.note-chip[aria-pressed=true]{border-color:var(--note-color);color:var(--note-color);background:#ffffff05}.note-chip.muted{text-decoration:line-through;opacity:.55}#selectedControls{margin-top:16px}#selectedControls .control-label{font-size:13px}.snap-note{font-size:12px;padding:6px 9px;margin-top:5px;color:var(--muted)}.scene.dragging{cursor:ns-resize}.scene.dragging-note{cursor:grabbing}
@media(min-width:731px){.scene{height:clamp(330px,48vh,555px)}aside{gap:17px}#yourNotes .control-label{margin-bottom:9px}.caption{padding-top:20px;min-height:95px}}
@media(max-width:730px){.scene{height:310px}.canvas-tools{gap:5px;justify-content:space-between;margin-top:9px}.canvas-tools button{font-size:12px;padding:7px 8px}.canvas-tools span{font-size:11px;margin:0}.gesture-hint{font-size:11px;line-height:1.5;margin:8px auto 0;max-width:320px}.caption{min-height:88px;padding-top:14px}.note-handle span{font-size:11px}.note-handle{width:44px;height:44px}}

.skip-tour{width:100%;margin-bottom:17px;color:var(--gold);border-color:#ffd16655;font-size:14px}.file-button{display:block;text-align:center;padding:12px;border:1px solid var(--gold);color:var(--gold);border-radius:9px;cursor:pointer}.file-button input{display:none}.clip-help,.clip-name{font-size:12px;color:var(--muted);overflow-wrap:anywhere}.clip-name{color:var(--ink)}#clipTrimmer .control-label{margin-top:15px;font-size:13px}#welcome{max-width:450px;text-align:center;padding:32px}#welcome h2{line-height:1.25;font-size:30px}#welcome .primary{width:100%;font-size:17px;margin-top:15px}#skipWelcome{display:block;width:100%;margin-top:12px;border:0;color:var(--muted)}.welcome-mark{font-size:58px;color:var(--gold);line-height:1.3;margin-bottom:18px}#welcome .subtle{margin-bottom:0}#noteFrequency{touch-action:pan-y}#orbits:focus-visible{outline:2px solid var(--gold);outline-offset:-4px}
@media(max-width:730px){.tabs{gap:0}.tabs button{padding:10px 8px;font-size:13px}#welcome{padding:25px}#welcome h2{font-size:27px}}

.demo-tracks{display:grid;gap:8px}.demo-track{text-align:left;padding:12px 13px;display:block;width:100%;background:#121b2b}.demo-track strong{display:block;font-size:15px;font-weight:500}.demo-track small{display:block;font-size:11px;color:var(--muted);margin-top:3px}.demo-track[aria-pressed=true]{border-color:var(--gold);color:var(--gold)}.music-credit{font-size:11px;line-height:1.6;color:var(--muted);margin:10px 0 16px}.music-credit a{text-decoration:underline;text-underline-offset:2px}.own-audio-label{font-size:12px;color:var(--muted);margin:15px 0 8px}

#controlsDrawer{margin:0 0 0 auto;width:min(92vw,390px);height:100dvh;max-height:100dvh;max-width:none;padding:0;border:0;border-left:1px solid var(--line);border-radius:16px 0 0 16px;overflow:hidden;background:#0d1320}#controlsDrawer[open]{display:flex;flex-direction:column}.drawer-heading{display:flex;align-items:center;justify-content:space-between;flex:0 0 auto;padding:17px 20px;border-bottom:1px solid var(--line)}.drawer-heading h2{font-size:20px}.drawer-heading button{border:0;padding:8px 12px}#controlsDrawer aside{border:0;flex:1;min-height:0;overflow-y:auto;overscroll-behavior:contain;padding:20px 20px max(24px,env(safe-area-inset-bottom));gap:20px}#controlsDrawer .explain{margin-top:0}#controlsDrawer::backdrop{background:#0009;backdrop-filter:blur(4px)}
@media(max-width:730px){html,body{width:100%;height:100%;overflow:hidden}body{height:100dvh;display:flex;flex-direction:column;padding-top:env(safe-area-inset-top)}header{height:52px;min-height:52px;flex:none;padding:0 16px}.brand{font-size:22px}header nav{gap:14px;font-size:11px}header nav button{font-size:11px}main{flex:1;min-height:0;min-width:0;width:100%;margin:0;display:flex;overflow:hidden}.visual-panel{height:100%;width:100%;display:flex;flex-direction:column;padding:0 14px;min-height:0;overflow:hidden}.tabs{height:40px;min-height:40px;flex:none}.tabs button{padding:7px 9px}.scene{height:auto;min-height:0;flex:1}.readout{top:10px;left:3px}.readout strong{font-size:36px}.readout #unit{font-size:14px;margin-left:6px}.readout #note{font-size:12px}.ratio-readout{font-size:23px;top:13px}.voice-values{font-size:10px;bottom:1px}.canvas-tools{flex:none;margin:3px 0 0;min-height:32px}.canvas-tools button{padding:5px 8px}.gesture-hint{font-size:10px;line-height:1.35;margin:5px auto 0;max-width:340px;flex:none}.scale-wrap{flex:none;margin-top:0}#scale{height:66px}.piano{height:12px}.caption{flex:none;min-height:0;padding:8px 0 10px}.caption h1{font-size:18px;line-height:1.25;margin-bottom:3px}.caption p{font-size:10px;line-height:1.35;max-width:340px;margin:auto}.note-handle span{font-size:10px}#mobileDock{flex:none;display:grid;grid-template-columns:minmax(0,1fr) 86px;gap:5px 9px;padding:9px 14px max(7px,env(safe-area-inset-bottom));border-top:1px solid var(--line);background:var(--bg)}#mobileTransportSlot .transport{gap:8px}#mobileDock .primary{height:44px;font-size:18px}#mobileDock .icon-button{width:44px;height:44px;font-size:25px;padding:2px}#controlsButton{font-size:13px;padding:7px 6px;height:44px}#mobileStatusSlot{grid-column:1/-1;min-width:0}#mobileStatusSlot #status{font-size:10px;line-height:1.3;min-height:13px;margin:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}#controlsDrawer .journey-switch{margin:0}#controlsDrawer .caption{display:none}}
@media(max-width:730px) and (max-height:690px){.caption p{display:none}.caption{padding:6px 0}.caption h1{font-size:16px}.gesture-hint{font-size:9px;line-height:1.2;margin-top:2px}.readout strong{font-size:30px}.ratio-readout{font-size:20px}#scale{height:56px}.piano{height:9px}header{height:47px;min-height:47px}.tabs{height:36px;min-height:36px}#mobileDock{padding-top:6px;padding-bottom:max(5px,env(safe-area-inset-bottom))}}

/* A true piano silhouette: black keys overlap white keys in groups of two and three. */
.piano{display:block;position:relative;width:100%;margin-left:0;height:30px;overflow:hidden;border-radius:3px;background:#c4cedb}.piano span{position:absolute;top:0;height:100%;border:0;border-right:1px solid #637087;border-radius:0 0 2px 2px;background:#d7dfeb}.piano span.black{height:62%;z-index:2;border:1px solid #080c16;border-top:0;border-radius:0 0 2px 2px;background:#101521}.piano span.black:after{display:none}.piano span.active,.piano span.black.active{background:var(--key-color);box-shadow:inset 0 -3px 0 #ffffff30}.piano span.white.active{z-index:1}
@media(max-width:730px){.piano{height:25px;margin-top:2px}}@media(max-width:730px) and (max-height:690px){.piano{height:21px}}

/* Playable, latched piano: one roomy octave on phones. */
#keyboardToolbar{display:flex;align-items:center;justify-content:space-between;margin:8px 0}#octaveControls{display:flex;gap:10px;align-items:center;color:var(--muted);white-space:nowrap;font-size:13px}#octaveControls button{width:34px;height:34px;padding:2px;font-size:21px}#octaveRange{min-width:57px;text-align:center}.piano{height:116px;border-radius:7px;background:transparent;overflow:visible;margin:0 0 8px}.piano button{position:absolute;top:0;height:100%;padding:0;border:1px solid #8d98aa;border-bottom:5px solid #929fae;border-radius:0 0 7px 7px;background:#e0e6ed;color:#465467;touch-action:manipulation}.piano button span{position:absolute;bottom:8px;left:0;right:0;top:auto;width:100%;height:auto;background:none;border:0;text-align:center;font-size:12px;line-height:1.2;color:inherit}.piano button.black{height:64%;z-index:2;background:#131c28;color:#c0c9d5;border:1px solid #080c16;border-bottom:5px solid #080d15;box-shadow:0 3px 4px #0006}.piano button.black:after{display:none}.piano button.active{background:var(--key-color);border-bottom-color:color-mix(in srgb,var(--key-color),#000 25%);color:#12202d}.piano button.black.active{background:var(--key-color);color:#111923}.piano button:hover{filter:brightness(1.08)}.piano button:disabled{opacity:.3}#usageCoach{position:fixed;z-index:40;width:min(320px,calc(100vw - 20px));padding:13px 15px;border:1px solid #62728f;border-radius:12px;background:#172236;color:var(--ink);box-shadow:0 12px 40px #0008}#usageStep{font-size:11px;color:var(--gold)}#usageText{font-size:14px;line-height:1.45;margin:7px 0 12px}#usageCoach>div:last-child{display:flex;justify-content:space-between}#usageCoach button{font-size:12px;padding:6px 12px}#nextUsage{border-color:var(--gold);color:var(--gold)}.usage-target{outline:2px solid var(--gold)!important;outline-offset:3px}
@media(max-width:730px){#keyboardToolbar{display:none}.piano{height:108px;margin-bottom:8px;overflow:visible;flex:none}.piano button span{font-size:11px;bottom:7px}.piano button.black span{font-size:9px;bottom:6px}.scale-wrap{padding-bottom:0}#mobileDock{width:100%;border-top:0;grid-template-columns:minmax(0,1fr) auto;gap:3px 8px;padding:5px 0 4px;background:transparent}#mobileDock #octaveControls{font-size:12px;gap:8px}#mobileDock #octaveControls button{height:32px;width:32px}#mobileTransportSlot{grid-column:2;grid-row:1}#mobileDock .transport{gap:6px}#mobileDock .primary,#mobileDock .icon-button{height:32px;width:34px;min-width:34px;flex:none;padding:0;font-size:17px;border-radius:7px}#mobileDock #playText{display:none}#mobileDock .primary span:first-child{margin:0}#mobileStatusSlot{grid-column:1/-1;height:12px;min-height:12px}#mobileStatusSlot #status{font-size:9px;min-height:11px;line-height:1.2}header #controlsButton{height:34px;padding:5px 12px;width:auto;min-width:78px;font-size:13px;border:1px solid var(--line);border-radius:8px}.visual-panel{padding-bottom:env(safe-area-inset-bottom)}.caption{padding:4px 0 6px}.gesture-hint{display:none}}
@media(max-width:730px) and (max-height:690px){.piano{height:88px;margin-bottom:5px}#scale{height:49px}#mobileDock{padding-top:3px;gap:2px}#mobileStatusSlot{height:10px}#mobileDock .primary,#mobileDock .icon-button,#mobileDock #octaveControls button{height:30px}.readout strong{font-size:28px}.piano button span{font-size:10px}.piano button.black span{font-size:8px}}

.drawer-home{display:none}#controlsDrawer .drawer-home{display:block;font-size:13px;color:var(--muted)}.drawer-heading h2{margin-right:auto}#drawerHelp{font-size:17px;color:var(--muted)}

.project-links{display:flex;justify-content:space-between;align-items:center;gap:12px;border-top:1px solid var(--line);padding-top:18px;margin-top:18px;text-align:left;font-size:11px;color:var(--muted)}.project-links a:hover{color:var(--ink)}

/* Keep the instrument roomy even with browser chrome visible. */
@media(max-width:730px){header{height:46px;min-height:46px}.brand{font-size:20px;gap:10px}.brand-icon{width:28px;height:28px}.tabs{height:36px;min-height:36px}.tabs button{padding:5px 9px}.visual-panel{padding-left:10px;padding-right:10px}.readout strong{font-size:30px}.readout{top:7px}.ratio-readout{font-size:20px;top:10px}#scale{height:54px}.piano{height:98px;margin-bottom:5px}.voice-values{display:none}.canvas-tools{margin-top:0}#mobileDock{padding-top:3px}.note-handle span{top:-9px}}
@media(max-width:730px) and (max-height:690px){.piano{height:88px}#scale{height:49px}header{height:44px;min-height:44px}.tabs{height:34px;min-height:34px}}

@media(max-width:730px){header #controlsButton{display:grid;place-items:center;width:40px;min-width:40px;height:40px;padding:8px}#controlsButton svg{display:block;pointer-events:none}}