:root{--canvas-radius: 4px}.header-right{display:flex;gap:8px;align-items:center}.timer{background:var(--score-bg);color:var(--score-text);border-radius:6px;padding:6px 16px;text-align:center;min-width:70px;font-size:1.3rem;font-weight:700;font-variant-numeric:tabular-nums}.mistakes{background:var(--score-bg);color:var(--score-text);border-radius:6px;padding:6px 16px;text-align:center;min-width:60px;font-size:1rem;font-weight:600}#game-canvas{cursor:pointer}.numpad{display:grid;grid-template-columns:repeat(9,1fr);gap:4px;width:100%;max-width:500px;margin-top:12px}.numpad-btn{aspect-ratio:1;border:none;border-radius:8px;font-size:1.2rem;font-weight:700;cursor:pointer;background:var(--btn-secondary-bg);color:var(--btn-secondary-text);transition:opacity .15s;display:flex;align-items:center;justify-content:center}.numpad-btn:active{opacity:.7}.numpad-erase,.numpad-notes,.numpad-undo{grid-column:span 3;aspect-ratio:auto;padding:10px 0;font-size:1.1rem}.numpad-notes.active{background:var(--btn-primary-bg);color:var(--btn-primary-text)}.difficulty-option.selected{border-left:3px solid #1976d2}@media(max-height:600px){.timer{font-size:1rem;padding:4px 12px}.mistakes{font-size:.85rem;padding:4px 10px}.numpad{margin-top:8px;gap:2px}.numpad-btn{font-size:1rem}}@media(orientation:landscape)and (min-width:640px){.numpad{grid-column:2;width:260px}}