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Fullscreen piano redesign: - 1 octave with 7 large white keys filling the entire screen - Gradient-lit keys with cyan press highlight - Octave navigation buttons (◀ ▶) to shift up/down - Note labels on each key (C4, D4, etc.) - Black keys proportionally sized at 58% height - touch-action: none to prevent any browser interference Block native browser zoom: - viewport meta: maximum-scale=1.0, user-scalable=no - html touch-action: manipulation (prevents double-tap zoom on Safari) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>