š¤system promptā¢7 months ago
tailwind-design-system
Build scalable design systems with Tailwind CSS v4, design tokens,
# Tailwind Design System (v4)
Build production-ready design systems with Tailwind CSS v4, including CSS-first configuration, design tokens, component variants, responsive patterns, and accessibility.
> **Note**: This skill targets Tailwind CSS v4 (2024+). For v3 projects, refer to the [upgrade guide](https://tailwindcss.com/docs/upgrade-guide).
## When to Use This Skill
- Creating a component library with Tailwind v4
- Implementing design tokens and theming with CSS-first configuration
- Building responsive and accessible components
- Standardizing UI patterns across a codebase
- Migrating from Tailwind v3 to v4
- Setting up dark mode with native CSS features
## Key v4 Changes
| v3 Pattern | v4 Pattern |
| ------------------------------------- | --------------------------------------------------------------------- |
| `tailwind.config.ts` | `@theme` in CSS |
| `@tailwind base/components/utilities` | `@import "tailwindcss"` |
| `darkMode: "class"` | `@custom-variant dark (&:where(.dark, .dark *))` |
| `theme.extend.colors` | `@theme { --color-*: value }` |
| `require("tailwindcss-animate")` | CSS `@keyframes` in `@theme` + `@starting-style` for entry animations |
## Quick Start
```css
/* app.css - Tailwind v4 CSS-first configuration */
@import "tailwindcss";
/* Define your theme with @theme */
@theme {
/* Semantic color tokens using OKLCH for better color perception */
--color-background: oklch(100% 0 0);
--color-foreground: oklch(14.5% 0.025 264);
--color-primary: oklch(14.5% 0.025 264);
--color-primary-foreground: oklch(98% 0.01 264);
--color-secondary: oklch(96% 0.01 264);
--color-secondary-foreground: oklch(14.5% 0.025 264);
--color-muted: oklch(96% 0.01 264);
--color-muted-foreground: oklch(46% 0.02 264);
--color-accent: oklch(96% 0.01 264);
--color-accent-foreground: oklch(14.5% 0.025 264);
--color-destructive: oklch(53% 0.22 27);
--color-destructive-foreground: oklch(98% 0.01 264);
--color-border: oklch(91% 0.01 264);
--color-ring: oklch(14.5% 0.025 264);
--color-card: oklch(100% 0 0);
--color-card-foreground: oklch(14.5% 0.025 264);
/* Ring offset for focus states */
--color-ring-offset: oklch(100% 0 0);
/* Radius tokens */
--radius-sm: 0.25rem;
--radius-md: 0.375rem;
--radius-lg: 0.5rem;
--radius-xl: 0.75rem;
/* Animation tokens - keyframes inside @theme are output when referenced by --animate-* variables */
--animate-fade-in: fade-in 0.2s ease-out;
--animate-fade-out: fade-out 0.2s ease-in;
--animate-slide-in: slide-in 0.3s ease-out;
--animate-slide-out: slide-out 0.3s ease-in;
@keyframes fade-in {
from {
opacity: 0;
}
to {
opacity: 1;
}
}
@keyframes fade-out {
from {
opacity: 1;
}
to {
opacity: 0;
}
}
@keyframes slide-in {
from {
transform: translateY(-0.5rem);
opacity: 0;
}
to {
transform: translateY(0);
opacity: 1;
}
}
@keyframes slide-out {
from {
transform: translateY(0);
opacity: 1;
}
to {
transform: translateY(-0.5rem);
opacity: 0;
}
}
}
/* Dark mode variant - use @custom-variant for class-based dark mode */
@custom-variant dark (&:where(.dark, .dark *));
/* Dark mode theme overrides */
.dark {
--color-background: oklch(14.5% 0.025 264);
--color-foreground: oklch(98% 0.01 264);
--color-primary: oklch(98% 0.01 264);
--color-primary-foreground: oklch(14.5% 0.025 264);
--color-secondary: oklch(22% 0.02 264);
--color-secondary-foreground: oklch(98% 0.01 264);
--color-muted: oklch(22% 0.02 264);
--color-muted-foreground: oklch(65% 0.02 264);
--color-accent: oklch(22% 0.02 264);
--color-accent-foreground: oklch(98% 0.01 264);
--color-destructive: oklch(42% 0.15 27);
--color-destructive-foreground: oklch(98% 0.01 264);
--color-border: oklch(22% 0.02 264);
--color-ring: oklch(83% 0.02 264);
--color-card: oklch(14.5% 0.025 264);
--color-card-foreground: oklch(98% 0.01 264);
--color-ring-offset: oklch(14.5% 0.025 264);
}
/* Base styles */
@layer base {
* {
@apply border-border;
}
body {
@apply bg-background text-foreground antialiased;
}
}
```
## Core Concepts
### 1. Design Token Hierarchy
```
Brand Tokens (abstract)
āāā Semantic Tokens (purpose)
āāā Component Tokens (specific)
Example:
oklch(45% 0.2 260) ā --color-primary ā bg-primary
```
### 2. Component Architecture
```
Base styles ā Variants ā Sizes ā States ā Overrides
```
## Patterns
### Pattern 1: CVA (Class Variance Authority) Components
```typescript
// components/ui/button.tsx
import { Slot } from '@radix-ui/react-slot'
import { cva, type VariantProps } from 'class-variance-authority'
import { cn } from '@/lib/utils'
const buttonVariants = cva(
// Base styles - v4 uses native CSS variables
'inline-flex items-center justify-center whitespace-nowrap rounded-md text-sm font-medium 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',
{
variants: {
variant: {
default: 'bg-primary text-primary-foreground hover:bg-primary/90',
destructive: 'bg-destructive text-destructive-foreground hover:bg-destructive/90',
outline: 'border border-border bg-background hover:bg-accent hover:text-accent-foreground',
secondary: 'bg-secondary text-secondary-foreground hover:bg-secondary/80',
ghost: 'hover:bg-accent hover:text-accent-foreground',
link: 'text-primary underline-offset-4 hover:underline',
},
size: {
default: 'h-10 px-4 py-2',
sm: 'h-9 rounded-md px-3',
lg: 'h-11 rounded-md px-8',
icon: 'size-10',
},
},
defaultVariants: {
variant: 'default',
size: 'default',
},
}
)
export interface ButtonProps
extends React.ButtonHTMLAttributes<HTMLButtonElement>,
VariantProps<typeof buttonVariants> {
asChild?: boolean
}
// React 19: No forwardRef needed
export function Button({
className,
variant,
size,
asChild = false,
ref,
...props
}: ButtonProps & { ref?: React.Ref<HTMLButtonElement> }) {
const Comp = asChild ? Slot : 'button'
return (
<Comp
className={cn(buttonVariants({ variant, size, className }))}
ref={ref}
{...props}
/>
)
}
// Usage
<Button variant="destructive" size="lg">Delete</Button>
<Button variant="outline">Cancel</Button>
<Button asChild><Link href="/home">Home</Link></Button>
```
### Pattern 2: Compound Components (React 19)
```typescript
// components/ui/card.tsx
import { cn } from '@/lib/utils'
// React 19: ref is a regular prop, no forwardRef
export function Card({
className,
ref,
...props
}: React.HTMLAttributes<HTMLDivElement> & { ref?: React.Ref<HTMLDivElement> }) {
return (
<div
ref={ref}
className={cn(
'rounded-lg border border-border bg-card text-card-foreground shadow-sm',
className
)}
{...props}
/>
)
}
export function CardHeader({
className,
ref,
...props
}: React.HTMLAttributes<HTMLDivElement> & { ref?: React.Ref<HTMLDivElement> }) {
return (
<div
ref={ref}
className={cn('flex flex-col space-y-1.5 p-6', className)}
{...props}
/>
)
}
export function CardTitle({
className,
ref,
...props
}: React.HTMLAttributes<HTMLHeadingElement> & { ref?: React.Ref<HTMLHeadingElement> }) {
return (
<h3
ref={ref}
className={cn('text-2xl font-semibold leading-none tracking-tight', className)}
{...props}
/>
)
}
export function CardDescription({
className,
ref,
...props
}: React.HTMLAttributes<HTMLParagraphElement> & { ref?: React.Ref<HTMLParagraphElement> }) {
return (
<p
ref={ref}
className={cn('text-sm text-muted-foreground', className)}
{...props}
/>
)
}
export function CardContent({
className,
ref,
...props
}: React.HTMLAttributes<HTMLDivElement> & { ref?: React.Ref<HTMLDivElement> }) {
return (
<div ref={ref} className={cn('p-6 pt-0', className)} {...props} />
)
}
export function CardFooter({
className,
ref,
...props
}: React.HTMLAttributes<HTMLDivElement> & { ref?: React.Ref<HTMLDivElement> }) {
return (
<div
ref={ref}
className={cn('flex items-center p-6 pt-0', className)}
{...props}
/>
)
}
// Usage
<Card>
<CardHeader>
<CardTitle>Account</CardTitle>
<CardDescription>Manage your account settings</CardDescription>
</CardHeader>
<CardContent>
<form>...</form>
</CardContent>
<CardFooter>
<Button>Save</Button>
</CardFooter>
</Card>
```
### Pattern 3: Form Components
```typescript
// components/ui/input.tsx
import { cn } from '@/lib/utils'
export interface InputProps extends React.InputHTMLAttributes<HTMLInputElement> {
error?: string
ref?: React.Ref<HTMLInputElement>
}
export function Input({ className, type, error, ref, ...props }: InputProps) {
return (
<div className="relative">
<input
type={type}
className={cn(
'flex h-10 w-full rounded-md border border-border bg-background px-3 py-2 text-sm ring-offset-background file:border-0 file:bg-transparent file:text-sm file:font-medium 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',
error && 'border-destructive focus-visible:ring-destructive',
className
)}
ref={ref}
aria-invalid={!!error}
aria-describedby={error ? `${props.id}-error` : undefined}
{...props}
/>
{error && (
<p
id={`${props.id}-error`}
className="mt-1 text-sm text-destructive"
role="alert"
>
{error}
</p>
)}
</div>
)
}
// components/ui/label.tsx
import { cva, type VariantProps } from 'class-variance-authority'
const labelVariants = cva(
'text-sm font-medium leading-none peer-disabled:cursor-not-allowed peer-disabled:opacity-70'
)
export function Label({
className,
ref,
...props
}: React.LabelHTMLAttributes<HTMLLabelElement> & { ref?: React.Ref<HTMLLabelElement> }) {
return (
<label ref={ref} className={cn(labelVariants(), className)} {...props} />
)
}
// Usage with React Hook Form + Zod
import { useForm } from 'react-hook-form'
import { zodResolver } from '@hookform/resolvers/zod'
import { z } from 'zod'
const schema = z.object({
email: z.string().email('Invalid email address'),
password: z.string().min(8, 'Password must be at least 8 characters'),
})
function LoginForm() {
const { register, handleSubmit, formState: { errors } } = useForm({
resolver: zodResolver(schema),
})
return (
<form onSubmit={handleSubmit(onSubmit)} className="space-y-4">
<div className="space-y-2">
<Label htmlFor="email">Email</Label>
<Input
id="email"
type="email"
{...register('email')}
error={errors.email?.message}
/>
</div>
<div className="space-y-2">
<Label htmlFor="password">Password</Label>
<Input
id="password"
type="password"
{...register('password')}
error={errors.password?.message}
/>
</div>
<Button type="submit" className="w-full">Sign In</Button>
</form>
)
}
```
### Pattern 4: Responsive Grid System
```typescript
// components/ui/grid.tsx
import { cn } from '@/lib/utils'
import { cva, type VariantProps } from 'class-variance-authority'
const gridVariants = cva('grid', {
variants: {
cols: {
1: 'grid-cols-1',
2: 'grid-cols-1 sm:grid-cols-2',
3: 'grid-cols-1 sm:grid-cols-2 lg:grid-cols-3',
4: 'grid-cols-1 sm:grid-cols-2 lg:grid-cols-4',
5: 'grid-cols-2 sm:grid-cols-3 lg:grid-cols-5',
6: 'grid-cols-2 sm:grid-cols-3 lg:grid-cols-6',
},
gap: {
none: 'gap-0',
sm: 'gap-2',
md: 'gap-4',
lg: 'gap-6',
xl: 'gap-8',
},
},
defaultVariants: {
cols: 3,
gap: 'md',
},
})
interface GridProps
extends React.HTMLAttributes<HTMLDivElement>,
VariantProps<typeof gridVariants> {}
export function Grid({ className, cols, gap, ...props }: GridProps) {
return (
<div className={cn(gridVariants({ cols, gap, className }))} {...props} />
)
}
// Container component
const containerVariants = cva('mx-auto w-full px-4 sm:px-6 lg:px-8', {
variants: {
size: {
sm: 'max-w-screen-sm',
md: 'max-w-screen-md',
lg: 'max-w-screen-lg',
xl: 'max-w-screen-xl',
'2xl': 'max-w-screen-2xl',
full: 'max-w-full',
},
},
defaultVariants: {
size: 'xl',
},
})
interface ContainerProps
extends React.HTMLAttributes<HTMLDivElement>,
VariantProps<typeof containerVariants> {}
export function Container({ className, size, ...props }: ContainerProps) {
return (
<div className={cn(containerVariants({ size, className }))} {...props} />
)
}
// Usage
<Container>
<Grid cols={4} gap="lg">
{products.map((product) => (
<ProductCard key={product.id} product={product} />
))}
</Grid>
</Container>
```
### Pattern 5: Native CSS Animations (v4)
```css
/* In your CSS file - native @starting-style for entry animations */
@theme {
--animate-dialog-in: dialog-fade-in 0.2s ease-out;
--animate-dialog-out: dialog-fade-out 0.15s ease-in;
}
@keyframes dialog-fade-in {
from {
opacity: 0;
transform: scale(0.95) translateY(-0.5rem);
}
to {
opacity: 1;
transform: scale(1) translateY(0);
}
}
@keyframes dialog-fade-out {
from {
opacity: 1;
transform: scale(1) translateY(0);
}
to {
opacity: 0;
transform: scale(0.95) translateY(-0.5rem);
}
}
/* Native popover animations using @starting-style */
[popover] {
transition:
opacity 0.2s,
transform 0.2s,
display 0.2s allow-discrete;
opacity: 0;
transform: scale(0.95);
}
[popover]:popover-open {
opacity: 1;
transform: scale(1);
}
@starting-style {
[popover]:popover-open {
opacity: 0;
transform: scale(0.95);
}
}
```
```typescript
// components/ui/dialog.tsx - Using native popover API
import * as DialogPrimitive from '@radix-ui/react-dialog'
import { cn } from '@/lib/utils'
const DialogPortal = DialogPrimitive.Portal
export function DialogOverlay({
className,
ref,
...props
}: React.ComponentPropsWithoutRef<typeof DialogPrimitive.Overlay> & {
ref?: React.Ref<HTMLDivElement>
}) {
return (
<DialogPrimitive.Overlay
ref={ref}
className={cn(
'fixed inset-0 z-50 bg-black/80',
'data-[state=open]:animate-fade-in data-[state=closed]:animate-fade-out',
className
)}
{...props}
/>
)
}
export function DialogContent({
className,
children,
ref,
...props
}: React.ComponentPropsWithoutRef<typeof DialogPrimitive.Content> & {
ref?: React.Ref<HTMLDivElement>
}) {
return (
<DialogPortal>
<DialogOverlay />
<DialogPrimitive.Content
ref={ref}
className={cn(
'fixed left-1/2 top-1/2 z-50 grid w-full max-w-lg -translate-x-1/2 -translate-y-1/2 gap-4 border border-border bg-background p-6 shadow-lg sm:rounded-lg',
'data-[state=open]:animate-dialog-in data-[state=closed]:animate-dialog-out',
className
)}
{...props}
>
{children}
</DialogPrimitive.Content>
</DialogPortal>
)
}
```
### Pattern 6: Dark Mode with CSS (v4)
```typescript
// providers/ThemeProvider.tsx - Simplified for v4
'use client'
import { createContext, useContext, useEffect, useState } from 'react'
type Theme = 'dark' | 'light' | 'system'
interface ThemeContextType {
theme: Theme
setTheme: (theme: Theme) => void
resolvedTheme: 'dark' | 'light'
}
const ThemeContext = createContext<ThemeContextType | undefined>(undefined)
export function ThemeProvider({
children,
defaultTheme = 'system',
storageKey = 'theme',
}: {
children: React.ReactNode
defaultTheme?: Theme
storageKey?: string
}) {
const [theme, setTheme] = useState<Theme>(defaultTheme)
const [resolvedTheme, setResolvedTheme] = useState<'dark' | 'light'>('light')
useEffect(() => {
const stored = localStorage.getItem(storageKey) as Theme | null
if (stored) setTheme(stored)
}, [storageKey])
useEffect(() => {
const root = document.documentElement
root.classList.remove('light', 'dark')
const resolved = theme === 'system'
? (window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light')
: theme
root.classList.add(resolved)
setResolvedTheme(resolved)
// Update meta theme-color for mobile browsers
const metaThemeColor = document.querySelector('meta[name="theme-color"]')
if (metaThemeColor) {
metaThemeColor.setAttribute('content', resolved === 'dark' ? '#09090b' : '#ffffff')
}
}, [theme])
return (
<ThemeContext.Provider value={{
theme,
setTheme: (newTheme) => {
localStorage.setItem(storageKey, newTheme)
setTheme(newTheme)
},
resolvedTheme,
}}>
{children}
</ThemeContext.Provider>
)
}
export const useTheme = () => {
const context = useContext(ThemeContext)
if (!context) throw new Error('useTheme must be used within ThemeProvider')
return context
}
// components/ThemeToggle.tsx
import { Moon, Sun } from 'lucide-react'
import { useTheme } from '@/providers/ThemeProvider'
export function ThemeToggle() {
const { resolvedTheme, setTheme } = useTheme()
return (
<Button
variant="ghost"
size="icon"
onClick={() => setTheme(resolvedTheme === 'dark' ? 'light' : 'dark')}
>
<Sun className="size-5 rotate-0 scale-100 transition-all dark:-rotate-90 dark:scale-0" />
<Moon className="absolute size-5 rotate-90 scale-0 transition-all dark:rotate-0 dark:scale-100" />
<span className="sr-only">Toggle theme</span>
</Button>
)
}
```
## Utility Functions
```typescript
// lib/utils.ts
import { type ClassValue, clsx } from "clsx";
import { twMerge } from "tailwind-merge";
export function cn(...inputs: ClassValue[]) {
return twMerge(clsx(inputs));
}
// Focus ring utility
export const focusRing = cn(
"focus-visible:outline-none focus-visible:ring-2",
"focus-visible:ring-ring focus-visible:ring-offset-2",
);
// Disabled utility
export const disabled = "disabled:pointer-events-none disabled:opacity-50";
```
## Advanced v4 Patterns
### Custom Utilities with `@utility`
Define reusable custom utilities:
```css
/* Custom utility for decorative lines */
@utility line-t {
@apply relative before:absolute before:top-0 before:-left-[100vw] before:h-px before:w-[200vw] before:bg-gray-950/5 dark:before:bg-white/10;
}
/* Custom ut
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