UI Reasoning: Fitness/Gym App. Recommended Pattern: Feature-Rich + Data. Style Priority: Vibrant & Block-based + Dark Mode (OLED). Color Mood: Energetic (Orange #FF6B35) + Dark bg. Typography Mood: Bold + Motivational typography. Key Effects: Progress ring animations + Achievement unlocks. Decision Rules: {"must_have": "progress-tracking", "must_have": "workout-plans"}. Anti-Patterns: Static design + No gamification. Severity: HIGH.