What version of Tailwind CSS are you using?

v4.2.1

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

Next.js v16.1.5

What version of Node.js are you using?

v24.13.1

What browser are you using?

Chrome v146.0.7680.153

What operating system are you using?

macOS 26.3.1

Reproduction URL

https://play.tailwindcss.com/qUaArw9Uxb

Describe your issue

Placeholders are internally using --background-color, but should be using --placeholder-color.

Code reference:
https://github.com/tailwindlabs/tailwindcss/blob/main/packages/tailwindcss/src/utilities.ts#L3962C3-L3967

I'm happy to make this change too - thanks for your time!