Upgraded the project to Tailwind CSS v4 today. The new CSS-first configuration approach is a breath of fresh air — no more tailwind.config.js for most use cases.

The @theme directive for defining design tokens directly in CSS feels much more natural. Performance improvements are noticeable too, especially during development with faster HMR.

More detailed notes captured in tailwind-v4 — particularly the breaking changes around dark mode and @apply.