CSS highlighting breaks when a nested rule comes before a custom property in the same block

Assessment

This issue has not been assessed yet.

Description

Bug

When a CSS block has a nested rule followed by a custom property declaration, syntax highlighting desyncs from that point on.

Repro

#a { .b { gap: 1px; } --c: 1px; }

Swap the order and it highlights fine:

#a { --c: 1px; .b { gap: 1px; } }

Both are valid, equivalent CSS (order doesn't matter per the CSS Nesting spec) — only the highlighting differs.

Expected: both orders highlight the same.

Env: Windows

Getting set up

First steps

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2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
3. Fork the repository and make your change on a branch.
4. Open a pull request that references the issue number.

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