:root{color-scheme:dark;--bg: #0f1115;--bg-elevated: #171a21;--bg-elevated-2: #1f232c;--border: #2b303b;--text: #eef0f4;--text-dim: #9aa2b1;--text-faint: #6b7280;--accent: #6ea8fe;--accent-contrast: #062043;--accent-dim: #2b3f63;--correct: #3ecf8e;--wrong: #f2637a;--missed: #f2b84b;--extra: #b98cf0;--focus-ring: #6ea8fe;--radius: 10px;--radius-sm: 6px;--font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-sans);font-size:15px;line-height:1.5}h1,h2,h3,h4{margin:0 0 .5em;font-weight:650;letter-spacing:-.01em}p{margin:0 0 .75em;color:var(--text-dim)}a{color:var(--accent)}button,input,select{font:inherit;color:inherit}:focus-visible{outline:2px solid var(--focus-ring);outline-offset:2px}.app-shell{display:flex;flex-direction:column;min-height:100%}.app-nav{display:flex;align-items:center;gap:1.5rem;padding:.75rem 1.25rem;border-bottom:1px solid var(--border);background:var(--bg-elevated);flex-wrap:wrap}.app-nav__brand{font-weight:700;font-size:1.05rem;color:var(--text);text-decoration:none;display:flex;align-items:center;gap:.4rem}.app-nav__links{display:flex;gap:.25rem;flex-wrap:wrap}.app-nav__link{padding:.4rem .7rem;border-radius:var(--radius-sm);color:var(--text-dim);text-decoration:none;font-size:.92rem}.app-nav__link:hover{background:var(--bg-elevated-2);color:var(--text)}.app-nav__link--active{background:var(--accent-dim);color:var(--text)}.app-main{flex:1;padding:1.25rem;max-width:1280px;width:100%;margin:0 auto}.page-header{margin-bottom:1.25rem}.page-header__eyebrow{color:var(--text-faint);font-size:.8rem;text-transform:uppercase;letter-spacing:.06em;margin-bottom:.25rem}.panel{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius);padding:1rem}.panel+.panel{margin-top:1rem}.btn{display:inline-flex;align-items:center;gap:.4rem;padding:.5rem .9rem;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--bg-elevated-2);color:var(--text);cursor:pointer;font-size:.9rem;font-weight:550;line-height:1.2;transition:background-color .12s ease,border-color .12s ease,opacity .12s ease}.btn:hover:not(:disabled){background:#262b36}.btn:disabled{opacity:.45;cursor:not-allowed}.btn--primary{background:var(--accent);color:var(--accent-contrast);border-color:var(--accent)}.btn--primary:hover:not(:disabled){filter:brightness(1.08)}.btn--danger{border-color:var(--wrong);color:var(--wrong)}.btn--icon{padding:.5rem;font-size:1rem}.btn-row{display:flex;gap:.5rem;flex-wrap:wrap;align-items:center}.toggle{display:inline-flex;align-items:center;gap:.5rem;cursor:pointer;font-size:.88rem;color:var(--text-dim);user-select:none}.toggle input{accent-color:var(--accent);width:1rem;height:1rem}.field{display:flex;flex-direction:column;gap:.3rem;font-size:.85rem;color:var(--text-dim)}.field input[type=range]{accent-color:var(--accent)}.select{padding:.4rem .6rem;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--bg-elevated-2);color:var(--text)}.badge{display:inline-flex;align-items:center;gap:.3rem;padding:.15rem .5rem;border-radius:999px;font-size:.75rem;font-weight:600;border:1px solid var(--border);color:var(--text-dim)}.badge--dot:before{content:"";width:.5rem;height:.5rem;border-radius:999px;background:currentColor}.badge--ok{color:var(--correct);border-color:color-mix(in srgb,var(--correct) 40%,var(--border))}.badge--warn{color:var(--missed);border-color:color-mix(in srgb,var(--missed) 40%,var(--border))}.badge--error{color:var(--wrong);border-color:color-mix(in srgb,var(--wrong) 40%,var(--border))}.badge--neutral{color:var(--text-faint)}.empty-state{text-align:center;padding:2.5rem 1rem;color:var(--text-dim)}.error-banner{background:color-mix(in srgb,var(--wrong) 14%,var(--bg-elevated));border:1px solid color-mix(in srgb,var(--wrong) 45%,var(--border));color:var(--wrong);padding:.6rem .85rem;border-radius:var(--radius-sm);font-size:.88rem;margin-bottom:.75rem}.drop-zone{border:2px dashed var(--border);border-radius:var(--radius);padding:2rem 1rem;text-align:center;color:var(--text-dim);cursor:pointer;transition:border-color .12s ease,background-color .12s ease}.drop-zone:hover,.drop-zone--active{border-color:var(--accent);background:var(--accent-dim);color:var(--text)}.drop-zone input{display:none}.song-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:.75rem}.song-card{display:block;text-align:left;background:var(--bg-elevated-2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:.85rem;cursor:pointer;color:var(--text)}.song-card:hover{border-color:var(--accent)}.song-card__name{font-weight:600;margin-bottom:.2rem}.song-card__meta{font-size:.8rem;color:var(--text-faint)}.practice-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:1rem;align-items:start}@media (max-width: 900px){.practice-layout{grid-template-columns:1fr}}.practice-main{display:flex;flex-direction:column;gap:1rem;min-width:0}.practice-side{display:flex;flex-direction:column;gap:1rem}.mode-tabs{display:flex;gap:.35rem;background:var(--bg-elevated-2);border-radius:var(--radius-sm);padding:.25rem}.mode-tabs button{flex:1;border:none;background:transparent;color:var(--text-dim);padding:.45rem .5rem;border-radius:calc(var(--radius-sm) - 2px);cursor:pointer;font-size:.85rem;font-weight:600}.mode-tabs button[aria-pressed=true]{background:var(--accent);color:var(--accent-contrast)}.mode-tabs button:disabled{opacity:.5;cursor:not-allowed}.transport{display:flex;flex-direction:column;gap:.75rem}.transport__row{display:flex;align-items:center;gap:.6rem;flex-wrap:wrap}.transport__seek{flex:1;min-width:160px;accent-color:var(--accent)}.transport__time{font-variant-numeric:tabular-nums;color:var(--text-dim);font-size:.85rem;min-width:5.5rem;text-align:right}.wait-banner{background:var(--accent-dim);border:1px solid var(--accent);color:var(--text);padding:.5rem .75rem;border-radius:var(--radius-sm);font-size:.88rem}.piano-roll{position:relative;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;background:var(--bg-elevated)}.piano-roll__scroll{overflow-x:auto;overflow-y:hidden}.piano-roll canvas{display:block}.piano-roll__toolbar{display:flex;justify-content:flex-end;gap:.4rem;padding:.4rem;border-bottom:1px solid var(--border)}.piano-roll__tooltip{position:absolute;pointer-events:none;background:#05070a;border:1px solid var(--border);border-radius:var(--radius-sm);padding:.4rem .55rem;font-size:.78rem;color:var(--text);white-space:nowrap;z-index:5;box-shadow:0 4px 14px #0006}.piano-keyboard{position:relative;width:100%;overflow-x:auto}.piano-keyboard svg{display:block}.piano-key{cursor:pointer;transition:fill .05s ease}.piano-key--white{fill:#f3f4f7;stroke:#0b0d12;stroke-width:1}.piano-key--black{fill:#17191f;stroke:#0b0d12;stroke-width:1}.piano-key--held{fill:var(--accent)}.piano-key--reference-active{fill:color-mix(in srgb,var(--correct) 55%,#f3f4f7)}.live-feedback{display:flex;flex-direction:column;gap:.35rem;max-height:220px;overflow-y:auto}.live-feedback__item{display:flex;justify-content:space-between;gap:.5rem;padding:.35rem .5rem;border-radius:var(--radius-sm);background:var(--bg-elevated-2);font-size:.82rem}.result-dot{display:inline-block;width:.55rem;height:.55rem;border-radius:999px;margin-right:.4rem}.result-dot--correct{background:var(--correct)}.result-dot--wrong-note{background:var(--wrong)}.result-dot--missed{background:var(--missed)}.result-dot--extra{background:var(--extra)}.score-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:.6rem}.score-tile{background:var(--bg-elevated-2);border-radius:var(--radius-sm);padding:.65rem .5rem;text-align:center}.score-tile__value{font-size:1.5rem;font-weight:700;font-variant-numeric:tabular-nums}.score-tile__label{font-size:.72rem;color:var(--text-faint);text-transform:uppercase;letter-spacing:.04em}.score-tile--overall{grid-column:1 / -1;background:var(--accent-dim)}.score-tile--overall .score-tile__value{font-size:2.2rem;color:var(--text)}.count-row{display:flex;justify-content:space-between;gap:.5rem;font-size:.85rem;color:var(--text-dim);margin-top:.75rem;flex-wrap:wrap}.result-table{width:100%;border-collapse:collapse;font-size:.85rem}.result-table th,.result-table td{text-align:left;padding:.4rem .5rem;border-bottom:1px solid var(--border)}.result-table th{color:var(--text-faint);font-weight:600;font-size:.75rem;text-transform:uppercase}.result-table tbody tr:hover{background:var(--bg-elevated-2)}.debug-panel{position:fixed;bottom:.75rem;right:.75rem;width:340px;max-height:60vh;overflow-y:auto;background:#0a0c10f5;border:1px solid var(--border);border-radius:var(--radius);padding:.75rem;font-family:var(--font-mono);font-size:.72rem;color:#9be9a8;z-index:50;box-shadow:0 8px 30px #00000080}.debug-panel dt{color:var(--text-faint);margin-top:.4rem}.debug-panel dd{margin:0 0 .15rem;word-break:break-word}.capability-list{display:flex;flex-direction:column;gap:.5rem}.capability-row{display:flex;justify-content:space-between;padding:.5rem .65rem;background:var(--bg-elevated-2);border-radius:var(--radius-sm);font-size:.88rem}