:root{--bg: #f4f5f7;--card: #ffffff;--text: #1c1e21;--muted: #5f646b;--border: #dfe2e6;--accent: #1f5fa8;--ok: #1a7f37;--bad: #b42318;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--text);background:var(--bg);line-height:1.45}*{box-sizing:border-box}body{margin:0}.app{max-width:1100px;margin:0 auto;padding:16px 16px 48px}.app-header h1{margin:8px 0 4px;font-size:1.7rem}.app-header p,.hint{color:var(--muted);margin:0 0 16px;max-width:70em}.app-footer{color:var(--muted);font-size:.85rem;margin-top:16px}.card{background:var(--card);border:1px solid var(--border);border-radius:8px;padding:14px 16px 16px;margin-bottom:16px}.card h2{margin:0 0 10px;font-size:1.15rem}.card h3{margin:0;font-size:.95rem;color:var(--muted);font-weight:600}.tone{border-top:4px solid;flex:1 1 380px;min-width:0}.tone-header{display:flex;align-items:center;justify-content:space-between;gap:8px}.columns{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:16px}.columns .card{margin-bottom:0}.plot{display:block;width:100%;background:#fff}.waveform-plot{height:170px}.stem-plot{height:120px}.plot-label{font-size:.8rem;color:var(--muted);margin:10px 0 2px}.controls-header{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px;margin:14px 0 6px}.button-row{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.spacer{flex:1}button{font:inherit;font-size:.9rem;padding:6px 12px;border-radius:6px;border:1px solid var(--border);background:#fff;color:var(--text);cursor:pointer}button:hover:not(:disabled){background:#f0f2f5}button:disabled{opacity:.5;cursor:default}button.primary{background:var(--accent);border-color:var(--accent);color:#fff}button.primary:hover:not(:disabled){background:#184c87}button.answer{font-weight:600;min-width:100px}button.small{font-size:.8rem;padding:4px 10px}.playing-indicator{color:var(--muted);font-size:.9rem;min-width:8em}.global-controls{display:flex;flex-wrap:wrap;gap:10px 24px;align-items:center}.global-controls label{display:flex;align-items:center;gap:8px;font-size:.9rem}.global-controls label>span{white-space:nowrap}.f0-range{width:180px}select{font:inherit;font-size:.9rem;padding:4px 6px;border-radius:6px;border:1px solid var(--border);background:#fff}.slider-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:2px 24px}.slider-row{display:grid;grid-template-columns:1.6em 1fr 5.5em 1.2em;align-items:center;gap:6px}.slider-label{font-variant-numeric:tabular-nums;color:var(--muted);font-size:.85rem;text-align:right}.slider-unit{color:var(--muted);font-size:.85rem}input[type=range]{width:100%;min-width:80px;accent-color:var(--accent)}.slider-value{font:inherit;font-size:.85rem;width:5.5em;padding:2px 4px;border:1px solid var(--border);border-radius:4px}.blind-controls{margin:8px 0}.feedback{min-height:1.6em;margin:6px 0 12px;font-size:.95rem}.feedback .ok{color:var(--ok);font-weight:600}.feedback .bad{color:var(--bad);font-weight:600}.stats{display:flex;flex-wrap:wrap;gap:8px 28px;align-items:flex-end;padding-top:10px;border-top:1px solid var(--border)}.stats>div{display:flex;flex-direction:column}.stat-label{font-size:.75rem;color:var(--muted)}.stat-value{font-size:1.15rem;font-variant-numeric:tabular-nums}.stat-value small{font-size:.8rem;color:var(--muted)}kbd{font-family:inherit;font-size:.85em;border:1px solid var(--border);border-bottom-width:2px;border-radius:4px;padding:0 5px;background:#fafbfc}.cycle-controls{display:flex;align-items:center;flex-wrap:wrap;gap:8px 20px;margin:4px 0 12px}.cycle-controls label{display:flex;align-items:center;gap:8px;font-size:.9rem}.cycle-controls label>span{white-space:nowrap}.cycle-range{width:220px}.cycle-period{color:var(--muted);font-variant-numeric:tabular-nums}.cycle-position{display:flex;align-items:center;gap:10px;max-width:520px}.cycle-end{font-weight:700}.cycle-a{color:#1f5fa8}.cycle-b{color:#d9641e}.cycle-track{position:relative;flex:1;height:8px;border-radius:4px;background:linear-gradient(90deg,#1f5fa8,#d9641e)}.cycle-marker{position:absolute;top:50%;width:16px;height:16px;border-radius:50%;background:#fff;border:2px solid var(--text);transform:translate(-50%,-50%);transition:opacity .2s}.error{color:var(--bad);margin-top:8px;font-size:.9rem}@media(max-width:600px){.slider-row{grid-template-columns:1.6em 1fr 4.5em 1.2em}}
