:root{font-family:Inter,Segoe UI,sans-serif;color-scheme:dark;--bg: #101819;--panel: #192426;--text: #edf5ef;--muted: #a7b8b5;--line: #344748;--accent: #b8e77e;--marker: #263637;--fret-guide: #fff;--ink: #111d1d;--o2: #f0ac65;--o3: #86bffa;--o4: #a6dc8a;--o5: #eca6cb;--o6: #edda79;background:var(--bg);color:var(--text)}:root[data-theme=light]{color-scheme:light;--bg: #f1f3ed;--panel: #fff;--text: #1b302d;--muted: #506561;--line: #cad6d0;--accent: #355e24;--marker: #e9efea;--fret-guide: #111}*{box-sizing:border-box}body{margin:0;min-width:0}main{max-width:2560px;margin:auto;padding:20px 24px}@media(max-width:700px){main{padding:16px 12px}header,.pitch-summary,.section-heading{flex-wrap:wrap;gap:12px}.panel{padding:16px}.workspace-menu-panel{width:min(760px,calc(100vw - 24px))}.controls,.note-colors-row,.legend{flex-wrap:wrap}}header{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}h1{font-size:32px;letter-spacing:-1px;margin:0}h2{font-size:17px;margin:0 0 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0;min-width:0;display:flex;align-items:center;overflow-x:auto}.voicing-strip:empty{display:none}.voicing-strip p{margin:0;color:var(--muted);font-size:13px}.section-heading{display:flex;justify-content:space-between}.section-heading span{font-size:12px;color:var(--muted)}.instrument-scroll{overflow-x:auto;padding:7px 3px 12px;scrollbar-color:var(--line) var(--panel)}svg{display:block}svg text{fill:var(--text);pointer-events:none}.fret-number{text-anchor:middle;font-size:12px;fill:var(--muted)}.fret-number.marked{font-weight:700;fill:var(--text)}.string-label{font-size:14px;font-weight:650}.cell{fill:none;stroke:var(--line)}.string-line{stroke:var(--line);stroke-width:1}.marker{fill:var(--marker);stroke:transparent;stroke-width:3}.tonic-diamond{fill:var(--ink);pointer-events:none}.piano-key.black .tonic-diamond{fill:#fff}.piano-key.black.active .tonic-diamond{fill:var(--ink)}.note{cursor:pointer;outline:none}.note.open{opacity:.55}.note.open:is(.active,:hover,:focus-visible){opacity:1}.note[data-octave] .marker{fill:var(--octave)}.note[data-octave] text{fill:var(--ink)}.note-label{text-anchor:middle;font-size:17px;font-weight:650}.frequency{text-anchor:middle;font-size:12px}.dot{fill:var(--text)}.note[data-octave] .dot{fill:var(--ink)}.note.active .marker{stroke:var(--text);stroke-width:4}.note.active .cell{stroke:var(--accent);stroke-width:2}.note:focus-visible .cell{stroke:var(--accent);stroke-width:3;stroke-dasharray:5 3}.open .cell{stroke-width:3}.legend{display:flex;gap:20px;font-size:12px;margin:20px 0}.legend span{display:flex;align-items:center;gap:7px}.legend i{background:var(--octave);border:1px solid #718078;width:10px;height:10px;border-radius:50%}[data-octave="2"]{--octave: var(--o2)}[data-octave="3"]{--octave: var(--o3)}[data-octave="4"]{--octave: var(--o4)}[data-octave="5"]{--octave: 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0}.fret-guide{stroke:var(--fret-guide);stroke-width:1;pointer-events:none}.fret-guide.octave-guide{stroke-width:2.5}.fretboard-heading{justify-content:flex-start;align-items:center;gap:12px}.fretboard-heading-title{flex:0 0 160px}.fretboard-harmony{flex:0 0 auto;min-width:0}.harmony-buttons{display:flex;flex-wrap:wrap;gap:8px}.harmony-chord{padding:6px 12px;cursor:pointer}.harmony-chord[aria-pressed=true]{border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent)}.harmony-chord:disabled{opacity:.38;cursor:not-allowed}.voicing-list{display:flex;flex-wrap:nowrap;gap:8px}.voicing-card{flex:0 0 auto;display:grid;gap:3px;padding:6px 8px;font-size:11px;border:2px solid var(--line);border-radius:8px;color:inherit;background:var(--panel);cursor:pointer}.voicing-card 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