A detailed system prompt for Nano Banana Pro Agent V1.2, instructing it to act as a senior UI/UX designer. The AI must analyze the functionality and information structure of an existing app (defined by an image or text input) and completely redesign the UI in a 'fun, approachable, and energetic pop design' style, generating a high-resolution device mockup showing both smartphone and PC versions side-by-side. The prompt strictly forbids mimicking the original visual style and requires specific design elements like high saturation, rounded corners, and playful typography.
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