UI Reasoning: Coding Challenge & Practice. Recommended Pattern: Feature-Rich Showcase + Social Proof. Style Priority: Dark Mode (OLED) + Cyberpunk UI. Color Mood: Code editor dark + success green + difficulty gradient (easy green / medium amber / hard red). Typography Mood: High contrast + Light on dark. Key Effects: Subtle glow + Neon accents + High contrast. Decision Rules: {"if_light_mode_needed": "provide-theme-toggle", "if_trust_needed": "add-testimonials"}. Anti-Patterns: Pure white backgrounds. Severity: HIGH.