Mobile App Ui Design

This is a comprehensive mobile UI/UX design skill that walks Claude through building polished app screens following patterns from apps like Airbnb, Spotify, and Duolingo. It enforces an 8-point grid system, the 60/30/10 color rule, and keeps you honest about typography limits (max 4 sizes, 2 weights). What I like is the ruthless focus on intentionality over flashiness, with specific guidance on thumb zones, the peak-end rule for emotional design, and smart defaults like using selection interfaces instead of text input. It includes anti-patterns to avoid and references industry conventions by app category. Works well for React artifacts with Tailwind, and the framework is opinionated enough to prevent the generic corporate UI trap.