UI Reasoning: Marketplace (P2P). Recommended Pattern: Feature-Rich Showcase + Social Proof. Style Priority: Vibrant & Block-based + Flat Design. Color Mood: Trust colors + Category colors + Success green. Typography Mood: Modern + Engaging typography. Key Effects: Review star animations + Listing hover effects. Decision Rules: {"must_have": "seller-profiles", "must_have": "secure-payment"}. Anti-Patterns: Low trust signals + Confusing layout. Severity: HIGH.