Mobile UI Design Skill (React Native) --- MANDATORY: Mobile Accessibility Standards These rules are NON-NEGOTIABLE. Every UI element must pass these checks. 1. Touch Targets (CRITICAL) 2. Color Contrast (CRITICAL) 3. Visibility Rules 4. Accessibility Labels (REQUIRED) 5. Focus/Selection States --- Core Philosophy Mobile UI is about touch, speed, and focus. No hover states, smaller screens, thumb-friendly targets. Design for one-handed use and interruption recovery. Platform Differences iOS vs Android Design Language Spacing System 4px Base Grid Safe Areas Typography Type Scale Color System Se…