UI Reasoning: Invoice & Billing Tool. Recommended Pattern: Conversion-Optimized + Trust. Style Priority: Minimalism + Flat Design. Color Mood: Professional navy + paid green + overdue red + neutral grey. Typography Mood: Professional + Clean hierarchy. Key Effects: Color shift hover + Fast 150ms transitions + No shadows. Decision Rules: {"if_conversion_focused": "add-urgency-colors"}. Anti-Patterns: Excessive decoration + Complex shadows + 3D effects. Severity: HIGH.