tailwind v4 upgrade command

app/globals.css

@@ -1,7 +1,78 @@
-@tailwind base;
-@tailwind components;
-@tailwind utilities;
+@import 'tailwindcss';
 
+@custom-variant dark (&:is(.dark *));
+
+@theme {
+  --font-sans: var(--font-sans);
+
+  --background-image-gradient-radial: radial-gradient(var(--tw-gradient-stops));
+  --background-image-gradient-conic: conic-gradient(
+    from 180deg at 50% 50%,
+    var(--tw-gradient-stops)
+  );
+
+  --radius-lg: var(--radius);
+  --radius-md: calc(var(--radius) - 2px);
+  --radius-sm: calc(var(--radius) - 4px);
+
+  --color-background: hsl(var(--background));
+  --color-foreground: hsl(var(--foreground));
+
+  --color-card: hsl(var(--card));
+  --color-card-foreground: hsl(var(--card-foreground));
+
+  --color-popover: hsl(var(--popover));
+  --color-popover-foreground: hsl(var(--popover-foreground));
+
+  --color-primary: hsl(var(--primary));
+  --color-primary-foreground: hsl(var(--primary-foreground));
+
+  --color-secondary: hsl(var(--secondary));
+  --color-secondary-foreground: hsl(var(--secondary-foreground));
+
+  --color-muted: hsl(var(--muted));
+  --color-muted-foreground: hsl(var(--muted-foreground));
+
+  --color-accent: hsl(var(--accent));
+  --color-accent-foreground: hsl(var(--accent-foreground));
+
+  --color-destructive: hsl(var(--destructive));
+  --color-destructive-foreground: hsl(var(--destructive-foreground));
+
+  --color-border: hsl(var(--border));
+  --color-input: hsl(var(--input));
+  --color-ring: hsl(var(--ring));
+
+  --color-chart-1: hsl(var(--chart-1));
+  --color-chart-2: hsl(var(--chart-2));
+  --color-chart-3: hsl(var(--chart-3));
+  --color-chart-4: hsl(var(--chart-4));
+  --color-chart-5: hsl(var(--chart-5));
+}
+
+/*
+  The default border color has changed to `currentcolor` in Tailwind CSS v4,
+  so we've added these compatibility styles to make sure everything still
+  looks the same as it did with Tailwind CSS v3.
+
+  If we ever want to remove these styles, we need to add an explicit border
+  color utility to any element that depends on these defaults.
+*/
+@layer base {
+  *,
+  ::after,
+  ::before,
+  ::backdrop,
+  ::file-selector-button {
+    border-color: var(--color-gray-200, currentcolor);
+  }
+}
+
+@utility text-balance {
+  text-wrap: balance;
+}
+
+@layer utilities {
   :root {
     --foreground-rgb: 0, 0, 0;
     --background-start-rgb: 214, 219, 220;
@@ -15,11 +86,6 @@
       --background-end-rgb: 0, 0, 0;
     }
   }
-
-@layer utilities {
-  .text-balance {
-    text-wrap: balance;
-  }
 }
 
 @layer base {

package.json

@@ -9,7 +9,6 @@
     "lint": "next lint && npx tsc --noEmit"
   },
   "dependencies": {
-    "autoprefixer": "^10.4.19",
     "class-variance-authority": "^0.7.0",
     "clsx": "^2.1.1",
     "cssnano": "^7.0.1",
@@ -25,13 +24,14 @@
     "tailwindcss-animate": "^1.0.7"
   },
   "devDependencies": {
+    "@tailwindcss/postcss": "^4.1.6",
     "@types/node": "22.15.17",
     "@types/react": "19.1.3",
     "@types/react-dom": "19.1.3",
     "eslint": "8.57.1",
     "eslint-config-next": "15.3.2",
     "postcss": "8.5.3",
-    "tailwindcss": "3.4.17",
+    "tailwindcss": "^4.1.6",
     "turbo": "2.5.3",
     "typescript": "5.8.3"
   },

postcss.config.mjs

@@ -1,9 +1,8 @@
 /** @type {import('postcss-load-config').Config} */
 const config = {
   plugins: {
-    tailwindcss: {},
+    '@tailwindcss/postcss': {},
 
-    autoprefixer: {},
     "postcss-flexbugs-fixes": {
       "postcss-preset-env": {
         autoprefixer: {

tailwind.config.ts

@@ -1,70 +0,0 @@
-import type { Config } from "tailwindcss";
-
-const config: Config = {
-    darkMode: ["class"],
-    content: [
-    "./lib/**/*.{ts,tsx,js,jsx}",
-    "./components/**/*.{js,ts,jsx,tsx,mdx}",
-    "./app/**/*.{js,ts,jsx,tsx,mdx}",
-  ],
-  theme: {
-  	extend: {
-  		fontFamily: {
-  			sans: ["var(--font-sans)"]
-  		},
-  		backgroundImage: {
-  			'gradient-radial': 'radial-gradient(var(--tw-gradient-stops))',
-  			'gradient-conic': 'conic-gradient(from 180deg at 50% 50%, var(--tw-gradient-stops))'
-  		},
-  		borderRadius: {
-  			lg: 'var(--radius)',
-  			md: 'calc(var(--radius) - 2px)',
-  			sm: 'calc(var(--radius) - 4px)'
-  		},
-  		colors: {
-  			background: 'hsl(var(--background))',
-  			foreground: 'hsl(var(--foreground))',
-  			card: {
-  				DEFAULT: 'hsl(var(--card))',
-  				foreground: 'hsl(var(--card-foreground))'
-  			},
-  			popover: {
-  				DEFAULT: 'hsl(var(--popover))',
-  				foreground: 'hsl(var(--popover-foreground))'
-  			},
-  			primary: {
-  				DEFAULT: 'hsl(var(--primary))',
-  				foreground: 'hsl(var(--primary-foreground))'
-  			},
-  			secondary: {
-  				DEFAULT: 'hsl(var(--secondary))',
-  				foreground: 'hsl(var(--secondary-foreground))'
-  			},
-  			muted: {
-  				DEFAULT: 'hsl(var(--muted))',
-  				foreground: 'hsl(var(--muted-foreground))'
-  			},
-  			accent: {
-  				DEFAULT: 'hsl(var(--accent))',
-  				foreground: 'hsl(var(--accent-foreground))'
-  			},
-  			destructive: {
-  				DEFAULT: 'hsl(var(--destructive))',
-  				foreground: 'hsl(var(--destructive-foreground))'
-  			},
-  			border: 'hsl(var(--border))',
-  			input: 'hsl(var(--input))',
-  			ring: 'hsl(var(--ring))',
-  			chart: {
-  				'1': 'hsl(var(--chart-1))',
-  				'2': 'hsl(var(--chart-2))',
-  				'3': 'hsl(var(--chart-3))',
-  				'4': 'hsl(var(--chart-4))',
-  				'5': 'hsl(var(--chart-5))'
-  			}
-  		}
-  	}
-  },
-  plugins: [require("tailwindcss-animate")],
-};
-export default config;