[Bug] Invalid CSS syntax in dist/style.css (nested var) breaks Next.js / Turbopack builds

[jkatumba]

Describe the bug

The @workflowbuilder/sdk package contains invalid CSS syntax in its compiled stylesheet (dist/style.css). Specifically, it uses a nested var(var(...)) construct, which violates the CSS Custom Properties specification.

Modern, strict CSS compilers such as Lightning CSS (used natively by Next.js Turbopack) fail the entire build when encountering this parsing error.

Error Output

Parsing CSS source code failed
./node_modules/@workflowbuilder/sdk/dist/style.css:1:411198
> 1 | ...debar_oks5m_1{width:auto}:root{--wb-palette-item-outline-color-hover: var(var(--ax-node-stroke-primary-hover));--wb-palette-item-shad-color-hover: r...
    |                                                                              ^
Unexpected token Function("var")