What version of Tailwind CSS are you using?

v4.0.10

What build tool (or framework if it abstracts the build tool) are you using?

@tailwindcss/cli

What version of Node.js are you using?

v22.12.0

What browser are you using?

Brave 1.76.73

What operating system are you using?

macOS 15

Reproduction URL

https://github.com/ledermann/tailwind-4.0.10-slim-issue

Describe your issue

Since 4.0.10, the parser fails to handle brackets in SLIM templates. See this example:

.text-xl.text-red-600[ data-foo="bar" ] | This line should be red

Here, the class text-red-600 is not processed.

It works fine with 4.0.9