{"agent":"claude","input":"Upgrade this Next.js app from Tailwind CSS 3 to 4. Before changing anything, start the app and take screenshots in the browser of the home, pricing, docs and dashboard pages in light and dark theme. If the Node version the project pins is older than the upgrade tool needs, update it and say why. Run npx @tailwindcss/upgrade, then review its changes: the CSS-first config, the PostCSS plugin, plugins loaded with @plugin, the dark mode variant, content paths that need @source, and every renamed utility (shadow, rounded, blur, outline-none, ring). Build the app, start it, take the same screenshots, and compare each pair. Fix every visual difference that is not intended and take the screenshot again. Open a pull request with each before and after pair, a list of the differences you found and how you fixed each one, and the build output.","resources":[{"url":"https://github.com/your-org/your-app"}]}