chore: Tailwind CSS v4 migration#4139
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WalkthroughThis PR migrates the webapp from Tailwind CSS v3 to v4. It rewrites Changes
Sequence Diagram(s)Not applicable — this PR consists of styling/className updates and a string identifier rename with no new interaction flows. Related PRs: None identified. Suggested labels: Suggested reviewers: webapp maintainers familiar with Tailwind CSS and the design system primitives Poem A rabbit hopped through classNames wide, 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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CSS-first @theme in app/tailwind.css: static palettes plus semantic color tokens as CSS variables, overridable per theme. Tailwind runs through @tailwindcss/postcss (Remix integration off). Plugins upgraded or replaced with v4 equivalents; tailwind-merge bumped to v3. Utility classes codemodded by the official upgrade tool. Fixed two invalid arbitrary variants the upgrade surfaced (table sticky cell :has(), number input attribute variant).
prism-react-renderer passes extra props through, so key ended up in the spread and triggered a React warning. Key is already set directly on the elements.
Adds surface (background-deep/hover/raised, surface-control/-hover/-active), border (border-bright/brighter/brightest) and text (text-faint) tokens to the themable layer, and sweeps ~930 raw charcoal-* usages across the dashboard to use them. Remaining raw charcoal usages are contrast-fixed decoration on colored accents, intentionally theme-independent.
Run-status and chart colors in JS now reference var(--color-*) tokens (run-status palette added to the theme). Streamdown container vars derive from semantic tokens instead of hardcoded dark HSL values; removed dead forced-dark code block overrides. dark: variant is now driven by data-theme on <html> (set to dark) instead of the OS preference, with color-scheme following the theme.
Shiki (streamdown), prism (CodeBlock) and CodeMirror themes now read from --color-code-* and --color-editor-* palettes declared in tailwind.css; callout variants use --color-callout-* tokens. A light theme can restyle all of them by overriding variables only.
Activity sparkbars on the project index use the shared run-status palette; chart grids, ticks, reference lines and loading skeletons read semantic tokens; usage meter and progress colors use success/warning/error tokens.
The upgrade codemod treated string literals in .ts files as utility classes: realtimeBackend "shadow" flag values, compute template creation "shadow" mode, and randomWords dictionary entries were renamed to shadow-sm/ring-3/ outline-solid. Restores the original values so persisted flags keep parsing.
…polation framer-motion can't parse var() strings, so animated colors (usage bar gradient, dashboard limit progress ring) snap instead of tweening. Adds a useThemeColor hook that resolves theme variables via getComputedStyle on mount, with dark-theme fallbacks for SSR.
Tailwind v4's default palette is oklch, which framer-motion can't interpolate. useThemeColor now round-trips the resolved color through a 1x1 canvas to get an animatable rgb value.
Align size-[1.125rem] with the 4.5 spacing token, use a range for the tailwindcss version, document the intentional ::-moz-selection duplicate, and share the glow gradient stop list via a custom property.
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Co-authored-by: devin-ai-integration[bot] <158243242+devin-ai-integration[bot]@users.noreply.github.com>
samejr
approved these changes
Jul 8, 2026
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Migrates the webapp from Tailwind CSS 3.4 to 4.x.
CSS-first
@themeinapp/tailwind.cssreplacestailwind.config.js. Semantic color tokens are CSS variables overridable per theme support.Note: the default palette is now oklch.
Testing
Typecheck, format and lint pass. Verified visually against the local dashboard — colors, borders, scrollbars, animations and focus s