:root{--ground:#fafaf8;--surface:#fff;--surface-muted:#f1f1ec;--line:#e4e4df;--line-strong:#d9d9d4;--ink:#16161a;--ink-muted:#5e5e66;--accent:#2250d9;--accent-hover:#15379b;--accent-ring:#2250d91f;--accent-wash:.08;--on-accent:#fff;--wrong:#d23b2e;--shadow-tint:#16161a0a;--font-ui:"Instrument Sans", system-ui, sans-serif;--font-music:"Noto Music", serif;--radius-s:4px;--radius-m:10px;--radius-l:12px;--radius-xl:16px;--radius-pill:999px}body{background:var(--ground);color:var(--ink);font-family:var(--font-ui);-webkit-font-smoothing:antialiased;margin:0}a{color:var(--accent)}a:hover{color:var(--accent-hover)}button{font:inherit;cursor:pointer}.page{background:var(--ground);flex-direction:column;min-height:100vh;display:flex}.app-header{border-bottom:1px solid var(--line);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;padding:20px 32px;display:flex}.app-header-lead{flex-wrap:wrap;align-items:center;gap:20px;display:flex}.app-header[data-screen=start] .app-header-lead{align-items:baseline;gap:12px}.app-header-tools{flex-wrap:wrap;align-items:center;gap:12px;display:flex}.wordmark{letter-spacing:-.01em;font-size:22px;font-weight:600}.tagline{color:var(--ink-muted);font-size:14px}.context-chip{border-radius:var(--radius-pill);background:var(--surface-muted);color:var(--ink-muted);padding:4px 10px;font-size:14px}.input-chip{border:1px solid var(--line);border-radius:var(--radius-pill);background:var(--surface);color:var(--ink-muted);align-items:center;gap:8px;padding:8px 12px;font-size:14px;display:inline-flex}.icon{flex:none}.sound-button,.stop-button{border:1px solid var(--ink);border-radius:var(--radius-pill);min-height:44px;color:var(--ink);background:0 0;justify-content:center;align-items:center;gap:8px;font-size:14px;font-weight:500;display:inline-flex}.sound-button{padding:8px 14px}.sound-button[aria-pressed=true]{background:var(--ink);color:var(--on-accent)}.stop-button{padding:8px 16px}.app-header .back-button{min-height:44px;color:var(--ink-muted);background:0 0;border:0;align-items:center;gap:6px;padding:0;font-size:14px;display:inline-flex}.app-header .back-button:hover{color:var(--ink)}.page-main{flex-direction:column;flex:auto;justify-content:center;align-items:center;padding:48px 16px;display:flex}.page-main[data-kind=start]{gap:40px}.page-main[data-kind=results]{gap:32px}.page-main[data-kind=play]{gap:28px;padding:32px 16px 48px}.page-footer{border-top:1px solid var(--line);color:var(--ink-muted);flex-wrap:wrap;justify-content:center;align-items:center;gap:8px 24px;padding:16px 32px;font-size:13px;display:flex}kbd{border:1px solid var(--line-strong);border-radius:var(--radius-s);background:var(--surface);color:var(--ink);padding:2px 6px;font-family:inherit}@media (width<=640px){.app-header,.page-footer{padding:16px}.page-main[data-kind=play]{justify-content:flex-start}}.start-screen{flex-direction:column;gap:32px;width:100%;max-width:560px;display:flex}.start-intro{flex-direction:column;gap:12px;display:flex}.start-intro h1{letter-spacing:-.02em;margin:0;font-size:36px;font-weight:600;line-height:1.1}.start-intro p{color:var(--ink-muted);margin:0;font-size:16px;line-height:1.5}.start-screen .field{border:0;flex-direction:column;gap:12px;min-width:0;margin:0;padding:0;display:flex}.start-screen .field-label{letter-spacing:.06em;text-transform:uppercase;color:var(--ink-muted);padding:0;font-size:13px;font-weight:600}.clef-tiles{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;display:grid}.start-screen .clef-button{border:2px solid var(--line);border-radius:var(--radius-l);background:var(--surface);min-height:88px;color:var(--ink);text-align:left;align-items:center;gap:16px;padding:16px 20px;display:flex}.start-screen .clef-button[aria-pressed=true]{border-color:var(--accent);box-shadow:0 0 0 4px var(--accent-ring)}.clef-glyph{width:40px;font-family:var(--font-music);text-align:center;flex:none;font-size:48px;line-height:1}.clef-glyph[data-clef=bass]{font-size:44px}.clef-text{flex-direction:column;gap:2px;min-width:0;display:flex}.clef-name{font-size:17px;font-weight:600}.clef-range{color:var(--ink-muted);font-size:13px}.round-length{border:1px solid var(--line);border-radius:var(--radius-m);background:var(--surface);grid-template-columns:repeat(5,minmax(0,1fr));display:grid;overflow:hidden}.round-length-button{border:0;border-right:1px solid var(--line);background:var(--surface);min-width:0;min-height:44px;color:var(--ink);font-variant-numeric:tabular-nums;padding:10px 0;font-size:15px}.round-length-button:last-child{border-right:0}.round-length-button[aria-pressed=true]{background:var(--ink);color:var(--on-accent);font-weight:600}.note-practice{flex-direction:column;gap:32px;display:flex}.start-exercises{border-top:1px solid var(--line);flex-direction:column;gap:12px;padding-top:32px;display:flex}.start-exercise-list{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;display:grid}.start-actions{flex-direction:column;gap:12px;display:flex}.start-round-button,.free-practice-button,.key-signatures-button,.chords-button,.dynamics-button{border-radius:var(--radius-l);text-align:center;justify-content:center;align-items:center;min-width:0;padding:12px 20px;display:flex}.start-round-button{background:var(--accent);min-height:52px;color:var(--on-accent);border:0;font-size:17px;font-weight:600}.start-round-button:hover{background:var(--accent-hover)}.free-practice-button{border:1px solid var(--ink);min-height:48px;color:var(--ink);background:0 0;font-size:16px;font-weight:500}.key-signatures-button,.chords-button,.dynamics-button{border:1px solid var(--line);background:var(--surface);min-height:48px;color:var(--ink);font-size:16px;font-weight:500}.best-panel{border-radius:var(--radius-m);background:var(--surface-muted);color:var(--ink-muted);justify-content:space-between;align-items:center;gap:16px;padding:14px 16px;font-size:14px;display:flex}.best-panel-value{color:var(--ink);font-variant-numeric:tabular-nums;font-weight:600}.history-panel{flex-direction:column;align-items:flex-start;gap:12px;display:flex}.history-panel .results-work-label{margin:0}.history-note{color:var(--ink-muted);margin:0;font-size:14px;line-height:1.5}.history-confirm{flex-wrap:wrap;align-items:center;gap:12px;font-size:14px;display:flex}.history-clear-button,.history-confirm-button,.history-cancel-button{border:1px solid var(--ink);border-radius:var(--radius-l);min-height:44px;color:var(--ink);background:0 0;padding:8px 20px;font-size:15px;font-weight:500}@media (width<=640px){.start-exercise-list{grid-template-columns:1fr}.start-screen .clef-button{gap:12px;padding:12px}}.play-row,.staff-card,.play-footer,.practice-work,.key-work,.key-timed,.key-history-panel,.dynamics-history-panel{box-sizing:border-box;width:100%;max-width:1100px}.play-row{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;display:flex}.play-row-count{justify-content:flex-end}.clef-switch,.mode-switch{border:1px solid var(--line);border-radius:var(--radius-m);background:var(--surface);grid-template-columns:repeat(2,minmax(0,1fr));margin:0;padding:0;display:inline-grid;overflow:hidden}.mode-switch{grid-template-columns:repeat(3,minmax(0,1fr));margin-right:auto}.clef-switch legend,.mode-switch legend,.key-answers legend{clip:rect(0 0 0 0);width:1px;height:1px;position:absolute;overflow:hidden}.clef-switch .clef-button,.mode-switch .mode-button{background:var(--surface);min-height:44px;color:var(--ink);border:0;align-items:center;gap:8px;padding:8px 18px;font-size:15px;display:inline-flex}.clef-switch .clef-button+.clef-button,.mode-switch .mode-button+.mode-button{border-left:1px solid var(--line)}.clef-switch .clef-button[aria-pressed=true],.mode-switch .mode-button[aria-pressed=true]{background:var(--ink);color:var(--on-accent);font-weight:600}.key-answers{box-sizing:border-box;border:0;grid-template-columns:repeat(5,minmax(0,1fr));gap:8px;width:100%;max-width:1100px;margin:0;padding:0;display:grid}@media (width>=768px){.key-answers{grid-template-columns:repeat(8,minmax(0,1fr))}}@media (width>=1280px){.key-answers{grid-template-columns:repeat(15,minmax(0,1fr))}}.key-answer{border:1px solid var(--line);border-radius:var(--radius-m);background:var(--surface);min-height:44px;color:var(--ink);padding:8px 0;font-size:15px}.key-answer[data-verdict=wrong]{border-color:var(--wrong);color:var(--wrong);font-weight:600}.chord-options{box-sizing:border-box;border:0;flex-wrap:wrap;gap:8px;width:100%;max-width:1100px;margin:0;padding:0;display:flex}.chord-options legend{clip:rect(0 0 0 0);width:1px;height:1px;position:absolute;overflow:hidden}.chord-option{border:1px solid var(--line);border-radius:var(--radius-pill);background:var(--surface);min-height:44px;color:var(--ink);padding:8px 14px;font-size:14px;font-weight:500}.chord-option[aria-pressed=true]{border-color:var(--ink);background:var(--ink);color:var(--on-accent)}.marking-switch{box-sizing:border-box;border:0;flex-wrap:wrap;align-items:center;gap:8px;width:100%;max-width:1100px;margin:0;padding:0;display:flex}.marking-switch legend{clip:rect(0 0 0 0);width:1px;height:1px;position:absolute;overflow:hidden}.marking-option{border:1px solid var(--line);border-radius:var(--radius-pill);background:var(--surface);min-width:56px;min-height:44px;color:var(--ink);padding:8px 14px;font-size:14px;font-weight:500}.marking-option[aria-pressed=true]{border-color:var(--ink);background:var(--ink);color:var(--on-accent)}.clef-switch .clef-glyph{font-family:var(--font-music);font-size:22px;line-height:1}.play-count{align-items:baseline;gap:10px;display:flex}.number-label{letter-spacing:.06em;text-transform:uppercase;color:var(--ink-muted);font-size:13px;font-weight:600}.status-count,.round-clock{font-variant-numeric:tabular-nums;font-weight:600;line-height:1}.status-count{letter-spacing:-.02em;font-size:32px}.key-mode{flex-direction:column;align-items:flex-end;gap:4px;margin-right:16px}.key-mode-word{letter-spacing:-.02em;font-size:32px;font-weight:600;line-height:1}.play-row-timed{grid-template-columns:repeat(3,minmax(0,1fr));align-items:end;display:grid}.play-row-keys{grid-template-columns:repeat(2,minmax(0,1fr)) auto minmax(0,1fr);gap:16px}.play-row-keys .key-mode{align-items:center;margin-right:0}.play-row-timed .play-clock,.play-row-timed .play-count{flex-direction:column;gap:4px;display:flex}.play-row-timed .play-count{align-items:flex-end}.play-row-timed .status-count,.round-clock{letter-spacing:-.03em;font-size:56px}.play-progress{justify-content:center;align-self:center;display:flex}.round-progress{border-radius:var(--radius-pill);background:var(--line);width:100%;max-width:260px;height:6px;overflow:hidden}.round-progress-fill{border-radius:var(--radius-pill);background:var(--accent);height:100%}.staff-card{border:1px solid var(--line);border-radius:var(--radius-xl);background:var(--surface);box-shadow:0 1px 2px var(--shadow-tint);margin:0;padding:32px 0}.dynamics-card{flex-direction:column;gap:8px;padding:32px 0 20px;display:flex}.dynamics-meter-wrap{padding:0 2%}.dynamics-meter{width:100%;height:auto;display:block}.meter-track{fill:var(--surface-muted);stroke:var(--line);stroke-width:1px}.meter-divider{stroke:var(--line);stroke-width:1px}.meter-wash{fill:var(--accent);fill-opacity:var(--accent-wash)}.meter-outline{fill:none;stroke:var(--accent);stroke-width:2px}.meter-label{font-family:var(--font-music);fill:var(--ink);font-size:20px}.meter-label-target{fill:var(--accent)}.meter-marker circle{fill:var(--ink)}.meter-marker line{stroke:var(--ink);stroke-width:2.5px}.meter-marker-wrong circle{fill:var(--wrong)}.meter-marker-wrong line{stroke:var(--wrong)}.marking-glyph{font-family:var(--font-music);fill:var(--ink)}.marking-name{fill:var(--ink-muted)}.marking-option .marking-glyph{font-family:var(--font-music);font-size:20px;line-height:1}.marking.current .marking-glyph{fill:var(--accent)}.work-marking{font-family:var(--font-music);color:var(--ink);font-size:48px;line-height:1.4}.status-right{color:var(--ink);font-weight:500}.play-footer{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px 24px;min-height:28px;display:flex}.practice-work,.key-work{flex-direction:column;gap:12px;min-height:230px;display:flex}.key-timed{flex-direction:column;gap:12px;display:flex}.practice-work .work-notes,.key-work .work-notes{flex-wrap:nowrap;overflow-x:auto}.practice-work .work-note,.key-work .work-note{flex:none}.status{color:var(--ink-muted);margin:0;font-size:16px}.status-wrong{color:var(--wrong);align-items:center;gap:8px;font-weight:500;display:inline-flex}.status-keys{color:var(--ink-muted);margin:0;font-size:13px}@media (width<=640px){.play-row-timed{gap:12px}.play-row-timed .status-count,.round-clock{font-size:40px}.play-row-timed .number-label{font-size:12px}.play-footer{flex-direction:column;justify-content:flex-start;align-items:flex-start}.play-footer .status{min-height:24px;line-height:24px}}.staff{width:100%;height:auto;display:block}.play-band{fill:var(--accent);fill-opacity:var(--accent-wash)}.clef{font-family:var(--font-music);fill:var(--ink);font-size:80px}.accidental{font-family:var(--font-music);text-anchor:end;font-size:18px}.staff-line,.ledger{stroke:var(--ink);stroke-width:1.5px}.play-line{stroke:var(--accent);stroke-width:2px}.notes{transition:transform .25s}.note-head{fill:var(--ink)}.played-wrong .note-head,.played-wrong .accidental{fill:var(--wrong)}.played-wrong .ledger{stroke:var(--wrong)}.note.current .note-head{fill:var(--accent)}.note.wrong .note-head{animation:.4s wrong-flash}@keyframes wrong-flash{0%{opacity:.3}to{opacity:1}}.results-screen{flex-direction:column;gap:32px;width:100%;max-width:720px;display:flex}.results-top{flex-wrap:wrap;justify-content:space-between;align-items:flex-start;gap:16px;display:flex}.results-heading{flex-direction:column;gap:8px;display:flex}.results-heading h1{letter-spacing:-.02em;margin:0;font-size:36px;font-weight:600;line-height:1.1}.result-summary{color:var(--ink-muted);margin:0;font-size:16px}.result-new-best{border-radius:var(--radius-pill);background:var(--accent);color:var(--on-accent);align-items:center;gap:8px;padding:8px 14px;font-size:14px;font-weight:600;display:inline-flex}.result-stats{grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin:0;display:grid}.result-stat{border:1px solid var(--line);border-radius:var(--radius-l);background:var(--surface);flex-direction:column;gap:6px;min-width:0;padding:20px;display:flex}.result-stat dt{letter-spacing:.06em;text-transform:uppercase;color:var(--ink-muted);font-size:13px;font-weight:600}.result-stat dd{letter-spacing:-.03em;font-variant-numeric:tabular-nums;margin:0;font-size:44px;font-weight:600;line-height:1}.result-stat .result-wrong{color:var(--wrong)}.result-unit{color:var(--ink-muted);font-size:22px}.results-work{flex-direction:column;gap:12px;display:flex}.results-work-label{letter-spacing:.06em;text-transform:uppercase;color:var(--ink-muted);margin:0;font-size:13px;font-weight:600}.results-work-empty,.practice-work-empty,.key-work-empty{color:var(--ink-muted);margin:0;font-size:14px}.work-notes{flex-wrap:wrap;gap:12px;display:flex}.work-note{border:1px solid var(--line);border-radius:var(--radius-l);background:var(--surface);flex-direction:column;gap:4px;padding:12px 16px;display:flex}.work-staff{width:120px;height:130px}.work-staff-wide{width:170px}.work-staff .staff-line,.work-staff .ledger{stroke:var(--ink);stroke-width:1.5px}.work-staff .clef{font-family:var(--font-music);fill:var(--ink);font-size:80px}.work-staff .accidental,.work-staff .note-head{fill:var(--ink)}.work-note-name{font-size:17px;font-weight:600}.work-note-detail{color:var(--ink-muted);font-size:13px}.work-note-missed{color:var(--wrong)}.result-best-panel{border-radius:var(--radius-l);background:var(--surface-muted);justify-content:space-between;align-items:center;gap:16px;padding:16px 20px;display:flex}.result-best-text{flex-direction:column;gap:2px;display:flex}.result-best-label{font-size:14px;font-weight:600}.result-previous{color:var(--ink-muted);font-size:13px}.result-best{letter-spacing:-.02em;font-variant-numeric:tabular-nums;font-size:28px;font-weight:600}.results-actions{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;display:grid}.play-again-button,.results-screen .back-button{border-radius:var(--radius-l);justify-content:center;align-items:center;min-height:52px;padding:12px 20px;display:flex}.play-again-button{background:var(--accent);color:var(--on-accent);border:0;font-size:17px;font-weight:600}.play-again-button:hover{background:var(--accent-hover)}.results-screen .back-button{border:1px solid var(--ink);color:var(--ink);background:0 0;font-size:16px;font-weight:500}@media (width<=640px){.result-stats{grid-template-columns:repeat(2,minmax(0,1fr))}}