diff --git a/apps/design-system/styles/globals.css b/apps/design-system/styles/globals.css
index a916f9d6663..38e3daf9b4e 100644
--- a/apps/design-system/styles/globals.css
+++ b/apps/design-system/styles/globals.css
@@ -1,11 +1,7 @@
 @import 'tailwindcss';
+@import './../../../packages/config/tailwind.config.css';
 @import './tailwind.config.css';
 
-@import './../../../packages/ui/build/css/source/global.css';
-@import './../../../packages/ui/build/css/themes/dark.css';
-@import './../../../packages/ui/build/css/themes/classic-dark.css';
-@import './../../../packages/ui/build/css/themes/light.css';
-
 @config '../../../packages/config/tailwind.config.js';
 
 @import 'config/typography.css';
diff --git a/apps/docs/styles/main.css b/apps/docs/styles/main.css
index 31307aead88..124c8c3599d 100644
--- a/apps/docs/styles/main.css
+++ b/apps/docs/styles/main.css
@@ -1,10 +1,6 @@
 @import 'tailwindcss';
+@import './../../../packages/config/tailwind.config.css';
 @import './tailwind.config.css';
-@import './../../../packages/config/tailwind-utilities/hit-area.css';
-
-@import './../../../packages/ui/build/css/source/global.css';
-@import './../../../packages/ui/build/css/themes/dark.css';
-@import './../../../packages/ui/build/css/themes/light.css';
 
 @config '../../../packages/config/tailwind.config.js';
 
diff --git a/apps/learn/styles/globals.css b/apps/learn/styles/globals.css
index 8f2c19c7fd4..fc8c5bcd06c 100644
--- a/apps/learn/styles/globals.css
+++ b/apps/learn/styles/globals.css
@@ -1,11 +1,7 @@
 @import 'tailwindcss';
+@import './../../../packages/config/tailwind.config.css';
 @import './tailwind.config.css';
 
-@import './../../../packages/ui/build/css/source/global.css';
-@import './../../../packages/ui/build/css/themes/dark.css';
-@import './../../../packages/ui/build/css/themes/classic-dark.css';
-@import './../../../packages/ui/build/css/themes/light.css';
-
 @config '../../../packages/config/tailwind.config.js';
 
 @layer base {
diff --git a/apps/lite-studio/app/app.css b/apps/lite-studio/app/app.css
index f6f77f6ae36..8361aa53e61 100644
--- a/apps/lite-studio/app/app.css
+++ b/apps/lite-studio/app/app.css
@@ -1,10 +1,6 @@
 @import 'tailwindcss';
+@import './../../../packages/config/tailwind.config.css';
 @import './tailwind.config.css';
-@import './../../../packages/config/tailwind-utilities/hit-area.css';
-
-@import './../../../packages/ui/build/css/source/global.css';
-@import './../../../packages/ui/build/css/themes/dark.css';
-@import './../../../packages/ui/build/css/themes/light.css';
 
 @config '../../../packages/config/tailwind.config.js';
 
diff --git a/apps/studio/styles/main.css b/apps/studio/styles/main.css
index 718799863d6..ae85cb3ed8c 100644
--- a/apps/studio/styles/main.css
+++ b/apps/studio/styles/main.css
@@ -1,11 +1,6 @@
 @import 'tailwindcss';
+@import './../../../packages/config/tailwind.config.css';
 @import './tailwind.config.css';
-@import './../../../packages/config/tailwind-utilities/hit-area.css';
-
-@import './../../../packages/ui/build/css/source/global.css';
-@import './../../../packages/ui/build/css/themes/dark.css';
-@import './../../../packages/ui/build/css/themes/light.css';
-@import './../../../packages/ui/build/css/themes/classic-dark.css';
 
 @import 'config/typography.css';
 
diff --git a/apps/ui-library/styles/globals.css b/apps/ui-library/styles/globals.css
index ea1e111c649..fc8c5bcd06c 100644
--- a/apps/ui-library/styles/globals.css
+++ b/apps/ui-library/styles/globals.css
@@ -1,11 +1,6 @@
 @import 'tailwindcss';
+@import './../../../packages/config/tailwind.config.css';
 @import './tailwind.config.css';
-@import './../../../packages/config/tailwind-utilities/hit-area.css';
-
-@import './../../../packages/ui/build/css/source/global.css';
-@import './../../../packages/ui/build/css/themes/dark.css';
-@import './../../../packages/ui/build/css/themes/classic-dark.css';
-@import './../../../packages/ui/build/css/themes/light.css';
 
 @config '../../../packages/config/tailwind.config.js';
 
diff --git a/apps/www/styles/index.css b/apps/www/styles/index.css
index 5ad29211342..9483ef24232 100644
--- a/apps/www/styles/index.css
+++ b/apps/www/styles/index.css
@@ -1,10 +1,6 @@
 @import 'tailwindcss';
+@import './../../../packages/config/tailwind.config.css';
 @import './tailwind.config.css';
-@import './../../../packages/config/tailwind-utilities/hit-area.css';
-
-@import './../../../packages/ui/build/css/source/global.css';
-@import './../../../packages/ui/build/css/themes/dark.css';
-@import './../../../packages/ui/build/css/themes/light.css';
 
 @config '../../../packages/config/tailwind.config.js';
 
diff --git a/packages/config/tailwind.config.css b/packages/config/tailwind.config.css
new file mode 100644
index 00000000000..e9f2c1e0ae6
--- /dev/null
+++ b/packages/config/tailwind.config.css
@@ -0,0 +1,26 @@
+/*
+ * Shared Tailwind v4 config for all Supabase apps.
+ *
+ * This file is the CSS-first orchestration layer. The imperative theme
+ * configuration (colors, typography, keyframes, custom plugins, etc.) still
+ * lives in the sibling `tailwind.config.js` and is loaded via the `@config`
+ * directive from each app's main CSS entry. That will migrate here in a
+ * follow-up commit.
+ */
+
+/* Core CSS variable definitions for the Supabase design system. Defines
+ * --foreground-*, --background-*, --border-*, etc. */
+@import '../ui/build/css/source/global.css';
+
+/* Per-mode overrides for the CSS variables above. */
+@import '../ui/build/css/themes/dark.css';
+@import '../ui/build/css/themes/light.css';
+@import '../ui/build/css/themes/classic-dark.css';
+
+/* v4-native port of the custom `hit-area-*` utilities (from bazza.dev). */
+@import './tailwind-utilities/hit-area.css';
+
+/* Dark mode: matches v3's `darkMode: ['class', '[data-theme*="dark"]']` —
+ * activates on `.dark` or `[data-theme*='dark']`, on the element itself
+ * or any ancestor. `:where()` keeps specificity at 0. */
+@custom-variant dark (&:where(.dark, .dark *, [data-theme*='dark'], [data-theme*='dark'] *));