This PR migrates all tailwind configs in the apps to be CSS configs.
They import a shared CSS Tailwind config from the `config` package
(which in turns imports the old JS config).
The shared JS config will be migrated to CSS in a followup PR.
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## Summary by CodeRabbit
* **Chores**
* Centralized Tailwind into a config-driven entrypoint and updated the
app build flow to use the new build step; many apps now import unified
global styles.
* **Style**
* Migrated global styles to a Tailwind v4-style setup, added
project-wide content scanning, consolidated theme imports, standardized
theme tokens (including new --container-site max-width), and added a
small prose utility to remove paragraph margins.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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Co-authored-by: Claude Sonnet 4.6 <[email protected]>
This PR fixes a bug where a user might choose `classic-dark` as a theme
in `studio` but then `docs` and `marketing` apps will look weird.
To test:
- Change the localStorage value of `theme` to `classic-dark`
- Open `www` and `docs` apps, they should look ok
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## Summary by CodeRabbit
* **New Features**
* Added a new "classic-dark" theme option for enhanced visual
customization.
* **Improvements**
* Unified and simplified theme handling across apps for more consistent
behavior.
* Improved system-theme detection and smoother transitions when
switching themes.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
This PR migrates the whole monorepo to use Tailwind v4:
- Removed `@tailwindcss/container-queries` plugin since it's included by
default in v4,
- Bump all instances of Tailwind to v4. Made minimal changes to the
shared config to remove non-supported features (`alpha` mentions),
- Migrate all apps to be compatible with v4 configs,
- Fix the `typography.css` import in 3 apps,
- Add missing rules which were included by default in v3,
- Run `pnpm dlx @tailwindcss/upgrade` on all apps, which renames a lot
of classes
- Rename all misnamed classes according to
https://tailwindcss.com/docs/upgrade-guide#renamed-utilities in all
apps.
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Co-authored-by: Jordi Enric <[email protected]>
# Changes
## Removed unused themes
- Deleted `concept-two.css` (unused) and `dark-combined.css` which was
identical to `dark.css`
- Removed the alias `deep-dark` to `dark` theme since it was unused
## Removed Figma token transform scripts
- Deleted the entire `internals/transform/` directory (~700 lines of JS)
— these scripts transformed Figma tokens into Tailwind variables but are
no longer needed
- Deleted `internals/tokens/cleanse-css-for-tailwind.js` and
`extract-design-tokens.js`
- Removed related dependencies from `package.json`
## Removed other unused files
- Deleted `shadcn.css` (unused)
- Deleted `tailwind-theming.md` (outdated doc),
https://supabase.com/design-system/docs/color-usage is a better resource
## Refactoring
- Extracted the `motion-safe-transition` Tailwind plugin into its own
file (`packages/config/tailwind-plugins/motion-safe-transition.js`)
- Renamed the tailwind class generation script for clarity
- Added stub `tailwind.config.js` files in packages that were missing
them, so VSCode IntelliSense works in those workspaces
- Updated `packages/ui/README.md` to reflect current usage patterns
(imports, styling conventions) instead of outdated Figma tokens workflow
# Testing
- Check all apps whether they have the correct themes with the correct
colors
[Linear
task](https://linear.app/supabase/issue/FE-3059/clean-up-unused-ui-build-artifacts-themes-and-figma-token-scripts)
This pull request migrates all SCSS stylesheets in the `apps/studio` and
`apps/docs` projects to CSS, updates import paths accordingly, and
consolidates PostCSS configuration to use a shared config. The migration
includes renaming files, updating import statements, converting SCSS
comments to CSS comments, and removing redundant or legacy configuration
files. The changes improve maintainability and consistency across the
codebase.
**Migration from SCSS to CSS:**
* All SCSS stylesheets in `apps/studio/styles` and `apps/docs/styles`
have been renamed to `.css`, and their contents updated by converting
SCSS comments (`// ...`) to CSS comments (`/* ... */`). All relevant
import statements in the app entry points have been updated to reference
the new `.css` files.
**PostCSS configuration consolidation:**
* The separate `postcss.config.cjs` files in `apps/design-system`,
`apps/learn`, and `apps/studio` now all import from a shared
`config/postcss.config`, ensuring consistent PostCSS setup across
projects. The legacy `postcss.config.js` in `apps/studio` has been
removed.
**Code and style consistency improvements:**
* All instances of the SCSS-specific `#{!important}` in Tailwind
`@apply` rules have been replaced with the standard CSS `!important`
syntax.
* Minor fixes and comment updates were made throughout the stylesheets
to improve readability and maintainability, such as moving or clarifying
TODOs and notes.
These changes streamline the styling approach, reduce build complexity,
and make it easier to maintain and scale the design system and
documentation styles.
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## Summary by CodeRabbit
* **Refactor**
* Consolidated PostCSS configuration across apps
* Migrated many stylesheet imports from SCSS to CSS
* Standardized CSS comment and @apply syntax for consistency
* **Chores**
* Removed SCSS (sass) dev dependency
* Added autoprefixer and tailwindcss/nesting to PostCSS plugins
* Removed SCSS module type declarations (cleaned up typings)
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Ivan Vasilov