:root{--bg: #f6f7f9;--card: #ffffff;--text: #15171c;--muted: #6b7180;--border: #e2e5ea;--accent: #2f6fed;--accent-text: #ffffff;--zone-green: #1f9d55;--zone-yellow: #d39e00;--zone-red: #e5484d;--out-of-key: #c2410c;--staff-ink: #2a2d34;--curve-grid: rgba(120, 128, 140, .22);--curve-tonic: rgba(47, 111, 237, .55);--curve-band: rgba(31, 157, 85, .14);--radius: 14px;color-scheme:light dark;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.4;-webkit-text-size-adjust:100%}@media (prefers-color-scheme: dark){:root{--bg: #111318;--card: #1a1d24;--text: #eceef2;--muted: #9aa1ae;--border: #2a2e37;--accent: #5b8cff;--accent-text: #0b0d12;--zone-green: #34c26f;--zone-yellow: #f2c037;--zone-red: #ff6369;--out-of-key: #fb923c;--staff-ink: #d9dce3;--curve-grid: rgba(160, 168, 180, .18);--curve-tonic: rgba(91, 140, 255, .6);--curve-band: rgba(52, 194, 111, .16)}}*{box-sizing:border-box}html,body{margin:0;background:var(--bg);color:var(--text)}.app{max-width:1040px;margin:0 auto;padding:12px max(12px,env(safe-area-inset-right)) 24px max(12px,env(safe-area-inset-left))}.app-header{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:12px}.brand{display:flex;align-items:center;gap:10px;min-width:0}.brand-logo{flex:none;width:32px;height:32px}.brand h1{margin:0;font-size:1.4rem;letter-spacing:.02em}.key-badge{color:var(--muted);font-size:.95rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.app-main{display:grid;gap:12px}.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:12px;min-width:0}#settings{margin-bottom:12px}@media (min-width: 820px){.app-main{grid-template-columns:1fr 1fr}.curve-card,.controls{grid-column:1 / -1}}.btn{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:1px solid var(--border);background:var(--card);color:var(--text);border-radius:999px;padding:10px 16px;font:inherit;font-weight:600;cursor:pointer;min-height:44px}.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-text);font-size:1.1rem;width:100%;min-height:52px}.btn.primary.stop{background:var(--zone-red);border-color:var(--zone-red)}.btn:disabled{opacity:.6;cursor:progress}.btn:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--accent);outline-offset:2px}.controls{display:grid;gap:8px}.error{margin:0;color:var(--zone-red);text-align:center}.note-display{text-align:center;padding:4px 0 8px;transition:opacity .3s}.note-display.inactive{opacity:.45}.note-name{font-size:clamp(3.5rem,18vw,6rem);font-weight:700;line-height:1;font-variant-numeric:tabular-nums}.note-name.placeholder{color:var(--muted)}.note-accidental{font-size:.75em;vertical-align:.25em;margin-left:.04em}.note-octave-num{font-size:.4em;vertical-align:baseline;margin-left:.05em;color:var(--muted)}.note-octave,.note-hint{color:var(--muted);font-size:1.05rem;margin-top:4px}.note-degree{margin-top:6px;font-size:1rem}.out-of-key .note-name{color:var(--out-of-key)}.out-of-key-label{color:var(--out-of-key);font-weight:600}.note-hz{margin-top:4px;color:var(--muted);font-variant-numeric:tabular-nums}.gauge{padding:6px 4px 0}.gauge-track{position:relative;height:34px;border-radius:8px;background:color-mix(in srgb,var(--zone-red) 18%,transparent);overflow:hidden}.gauge-band{position:absolute;top:0;bottom:0}.gauge-band.yellow{background:color-mix(in srgb,var(--zone-yellow) 28%,transparent)}.gauge-band.green{background:color-mix(in srgb,var(--zone-green) 38%,transparent)}.gauge-center{position:absolute;left:50%;top:0;bottom:0;width:2px;margin-left:-1px;background:var(--muted);opacity:.6}.gauge-needle{position:absolute;left:50%;top:3px;bottom:3px;width:6px;margin-left:-3px;border-radius:3px;background:var(--muted);transition:left 60ms linear,background-color .12s}.gauge[data-zone=none] .gauge-needle{opacity:.3}.gauge[data-zone=green] .gauge-needle{background:var(--zone-green)}.gauge[data-zone=yellow] .gauge-needle{background:var(--zone-yellow)}.gauge[data-zone=red] .gauge-needle{background:var(--zone-red)}.gauge-labels{display:flex;justify-content:space-between;gap:6px;font-size:.8rem;color:var(--muted);margin-top:4px}.gauge-readout{color:var(--text);font-weight:600;font-variant-numeric:tabular-nums}.gauge[data-zone=green] .gauge-readout{color:var(--zone-green)}.gauge[data-zone=yellow] .gauge-readout{color:var(--zone-yellow)}.gauge[data-zone=red] .gauge-readout{color:var(--zone-red)}.level{padding:8px 4px 0}.level-meter{position:relative;height:6px;border-radius:3px;background:var(--border);overflow:hidden}.level-fill{position:absolute;left:0;top:0;bottom:0;width:0;background:var(--muted);transition:width 40ms linear}.level-meter[data-state=ok] .level-fill{background:var(--zone-green)}.level-meter[data-state=clip] .level-fill{background:var(--zone-red)}.level-gate{position:absolute;top:0;bottom:0;width:2px;margin-left:-1px;background:var(--text);opacity:.55}.level-hint{margin:6px 0 0;font-size:.85rem;color:var(--zone-yellow);text-align:center}.level-hint[data-hint=loud]{color:var(--zone-red)}.staff{display:block;width:100%;max-height:220px;color:var(--staff-ink)}.staff line{stroke:currentColor;stroke-width:1.1}.staff text{fill:currentColor}.staff .note-head{fill:currentColor}.staff-note{transition:opacity .3s}.staff-note.inactive{opacity:.35}.pitch-curve{display:block;width:100%;height:200px}.settings{display:grid;gap:12px}@media (min-width: 600px){.settings{grid-template-columns:1fr 1fr}}.field{display:grid;gap:4px;margin:0;min-width:0}.field>span,.field>legend{font-size:.85rem;color:var(--muted)}.field-note{font-size:.8rem;color:var(--muted)}fieldset.field{border:1px solid var(--border);border-radius:10px;padding:6px 10px 10px}.field.zones{grid-template-columns:1fr 1fr;gap:8px}.field.zones>legend{grid-column:1 / -1}.radio{display:flex;align-items:center;gap:8px;min-height:32px}select,input[type=number]{font:inherit;color:var(--text);background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:8px;min-height:40px;width:100%}.drone{display:grid;gap:10px}.drone-toggle.on{border-color:var(--accent);color:var(--accent)}.drone-note{font-weight:400}.drone-row{display:grid;grid-template-columns:1fr 1fr;gap:10px}.field.inline input[type=range]{width:100%}.warning{margin:0;font-size:.85rem;color:var(--muted)}.warning.active{color:var(--zone-yellow)}