What version of Tailwind CSS are you using?

v4.0.11

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-4.0.11-slim-issue

Describe your issue

Similar to #16975, there is another issue with SLIM templates. With 4.0.11, the parser fails to handle nested brackets. See this example:

.text-black[
  data-controller= ['foo', ('bar' if rand.positive?)].join(' ')
]
  .bg-green-300
    | BLACK on GREEN - OK

  .bg-red-300[
    data-foo= 42
  ]
    | Should be BLACK on RED - FAIL

Here, the class bg-red-300 is not processed.