Ultra-realistic human hand isolated on a completely transparent background (alpha). The hand enters the frame from the right side, shown from the back, with the dorso of the hand facing the camera. The index finger is extended forward in a natural tapping pose, while the remaining fingers are gently curved inward. The hand performs a subtle single tap motion, as if pressing a button, but with no object visible only the gesture. No phone, no UI, no environmental elements. Background remains fully transparent. Soft natural lighting, detailed skin texture on the back of the hand, visible knuckles, tendons, and realistic shading. Clean commercial aesthetic, macro-lens clarity, smooth and natural movement