Design kit A native look comes from Apple's parts. A custom look comes from your own parts: your sidebar row, your button, your checkbox, your icons. SwiftUI draws all of them. A kit is those parts, the numbers behind them, and one page that shows every part in every state. Most apps keep Apple's parts and only pick an accent color ( skill). Build a kit when the parts themselves must change. To copy the look of an existing app, call the Skill tool with first: it measures the app and then comes back here. Everything lives in . Code for every step: parts.md. 1. Write the spec Write from kit-spe…