npx @tailwindcss/upgrade

app/globals.css

@@ -1,24 +1,90 @@
-@tailwind base;
+@import 'tailwindcss';
-@tailwind components;
-@tailwind utilities;
 
-:root {
+@custom-variant dark (&:is(.dark *));
-  --foreground-rgb: 0, 0, 0;
+
-  --background-start-rgb: 214, 219, 220;
+@theme {
-  --background-end-rgb: 255, 255, 255;
+  --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));
 }
 
-@media (prefers-color-scheme: dark) {
+/*
-  :root {
+  The default border color has changed to `currentcolor` in Tailwind CSS v4,
-    --foreground-rgb: 255, 255, 255;
+  so we've added these compatibility styles to make sure everything still
-    --background-start-rgb: 0, 0, 0;
+  looks the same as it did with Tailwind CSS v3.
-    --background-end-rgb: 0, 0, 0;
+
+  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 {
-  .text-balance {
+  :root {
-    text-wrap: balance;
+    --foreground-rgb: 0, 0, 0;
+    --background-start-rgb: 214, 219, 220;
+    --background-end-rgb: 255, 255, 255;
+  }
+
+  @media (prefers-color-scheme: dark) {
+    :root {
+      --foreground-rgb: 255, 255, 255;
+      --background-start-rgb: 0, 0, 0;
+      --background-end-rgb: 0, 0, 0;
+    }
   }
 }
 

components/ui/button.tsx

@@ -5,7 +5,7 @@ import { cva, type VariantProps } from "class-variance-authority";
 import { cn } from "@/lib/utils";
 
 const buttonVariants = cva(
-  "inline-flex items-center justify-center gap-2 whitespace-nowrap rounded-md text-sm font-medium ring-offset-background transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:pointer-events-none disabled:opacity-50 [&_svg]:pointer-events-none [&_svg]:size-4 [&_svg]:shrink-0",
+  "inline-flex items-center justify-center gap-2 whitespace-nowrap rounded-md text-sm font-medium ring-offset-background transition-colors focus-visible:outline-hidden focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:pointer-events-none disabled:opacity-50 [&_svg]:pointer-events-none [&_svg]:size-4 [&_svg]:shrink-0",
   {
     variants: {
       variant: {

components/ui/input.tsx

@@ -10,7 +10,7 @@ const Input = React.forwardRef<HTMLInputElement, InputProps>(
       <input
         type={type}
         className={cn(
-          "flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background file:border-0 file:bg-transparent file:text-sm file:font-medium file:text-foreground placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50",
+          "flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background file:border-0 file:bg-transparent file:text-sm file:font-medium file:text-foreground placeholder:text-muted-foreground focus-visible:outline-hidden focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50",
           className
         )}
         ref={ref}

components/ui/popover.tsx

@@ -19,7 +19,7 @@ const PopoverContent = React.forwardRef<
       align={align}
       sideOffset={sideOffset}
       className={cn(
-        "z-50 w-72 rounded-md border bg-popover p-4 text-popover-foreground shadow-md outline-none data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2",
+        "z-50 w-72 rounded-md border bg-popover p-4 text-popover-foreground shadow-md outline-hidden data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2",
         className
       )}
       {...props}

components/ui/select.tsx

@@ -19,7 +19,7 @@ const SelectTrigger = React.forwardRef<
   <SelectPrimitive.Trigger
     ref={ref}
     className={cn(
-      "flex h-10 w-full items-center justify-between rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background placeholder:text-muted-foreground focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50 [&>span]:line-clamp-1",
+      "flex h-10 w-full items-center justify-between rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background placeholder:text-muted-foreground focus:outline-hidden focus:ring-2 focus:ring-ring focus:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50 [&>span]:line-clamp-1",
       className
     )}
     {...props}
@@ -68,7 +68,7 @@ const SelectContent = React.forwardRef<
     <SelectPrimitive.Content
       ref={ref}
       className={cn(
-        "relative z-50 max-h-96 min-w-[8rem] overflow-hidden rounded-md border bg-popover text-popover-foreground shadow-md data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2",
+        "relative z-50 max-h-96 min-w-32 overflow-hidden rounded-md border bg-popover text-popover-foreground shadow-md data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2",
         position === "popper" &&
           "data-[side=bottom]:translate-y-1 data-[side=left]:-translate-x-1 data-[side=right]:translate-x-1 data-[side=top]:-translate-y-1",
         className
@@ -81,7 +81,7 @@ const SelectContent = React.forwardRef<
         className={cn(
           "p-1",
           position === "popper" &&
-            "h-[var(--radix-select-trigger-height)] w-full min-w-[var(--radix-select-trigger-width)]"
+            "h-(--radix-select-trigger-height) w-full min-w-(--radix-select-trigger-width)"
         )}
       >
         {children}
@@ -111,7 +111,7 @@ const SelectItem = React.forwardRef<
   <SelectPrimitive.Item
     ref={ref}
     className={cn(
-      "relative flex w-full cursor-default select-none items-center rounded-sm py-1.5 pl-8 pr-2 text-sm outline-none focus:bg-accent focus:text-accent-foreground data-[disabled]:pointer-events-none data-[disabled]:opacity-50",
+      "relative flex w-full cursor-default select-none items-center rounded-sm py-1.5 pl-8 pr-2 text-sm outline-hidden focus:bg-accent focus:text-accent-foreground data-disabled:pointer-events-none data-disabled:opacity-50",
       className
     )}
     {...props}

package.json

@@ -14,7 +14,6 @@
     "@radix-ui/react-popover": "^1.1.6",
     "@radix-ui/react-select": "^2.1.6",
     "@radix-ui/react-slot": "^1.1.2",
-    "autoprefixer": "^10.4.19",
     "class-variance-authority": "^0.7.0",
     "clsx": "^2.1.1",
     "cssnano": "^7.0.1",
@@ -33,6 +32,7 @@
     "zod": "^3.24.2"
   },
   "devDependencies": {
+    "@tailwindcss/postcss": "^4.1.6",
     "@types/node": "22.15.17",
     "@types/react": "19.1.3",
     "@types/react-dom": "19.1.3",
@@ -40,7 +40,7 @@
     "eslint-config-next": "15.3.2",
     "eslint-config-prettier": "10.1.5",
     "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;