UI Reasoning: Drawing & Sketching Canvas. Recommended Pattern: Interactive Product Demo + Storytelling. Style Priority: Minimalism + Dark Mode (OLED). Color Mood: Neutral canvas + full-spectrum color picker + tool panel dark. Typography Mood: Professional + Clean hierarchy. Key Effects: Subtle glow + Neon accents + High contrast. Decision Rules: {"if_light_mode_needed": "provide-theme-toggle"}. Anti-Patterns: Excessive decoration + Pure white backgrounds. Severity: HIGH.