UI Reasoning: Language Learning App. Recommended Pattern: Feature-Rich + Social Proof. Style Priority: Claymorphism + Vibrant & Block-based. Color Mood: Playful colors + Progress indicators. Typography Mood: Friendly + Clear typography. Key Effects: Progress animations + Achievement unlocks. Decision Rules: {"must_have": "progress-tracking", "must_have": "gamification"}. Anti-Patterns: Boring design + No motivation. Severity: HIGH.