UI Reasoning: Sleep Tracker. Recommended Pattern: Feature-Rich Showcase + Social Proof. Style Priority: Dark Mode (OLED) + Neumorphism. Color Mood: Deep midnight blue + stars/moon accent + sleep quality gradient (poor red to great green). Typography Mood: High contrast + Light on dark. Key Effects: Dual shadows (light+dark) + Soft press 150ms. Decision Rules: {"if_light_mode_needed": "provide-theme-toggle", "if_trust_needed": "add-testimonials"}. Anti-Patterns: Pure white backgrounds. Severity: HIGH.