tailwind-design-system

name	tailwind-design-system
description	Build scalable design systems with Tailwind CSS v4, design tokens, component libraries, and responsive patterns. Use when creating component libraries, implementing design systems, or standardizing UI patterns.

Repo notice (Asymmetric-al/core): This repository is Base UI only. Shared primitives come from @base-ui/react via the shadcn base-maia style in packages/ui. Ignore any Radix UI guidance below — never add radix-ui/@radix-ui/* imports or dependencies; composition uses Base UI's render prop, not asChild. See docs/ai/rules/frontend.md.

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.

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

/* 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%  );

  : (  );
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  : ;
  : ;
  : ;
  : ;

  
  : fade-in  ease-out;
  : fade-out  ease-in;
  : slide-in  ease-out;
  : slide-out  ease-in;

   fade-in {
     {
      : ;
    }
     {
      : ;
    }
  }

   fade-out {
     {
      : ;
    }
     {
      : ;
    }
  }

   slide-in {
     {
      : (-);
      : ;
    }
     {
      : ();
      : ;
    }
  }

   slide-out {
     {
      : ();
      : ;
    }
     {
      : (-);
      : ;
    }
  }
}


 dark (&:where(.dark, .dark *));


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  : (  );
}


 base {
  * {
     border-border;
  }

   {
     bg-background text-foreground antialiased;
  }
}

Core Concepts

1. Design Token Hierarchy

Brand Tokens (abstract)
    └── Semantic Tokens (purpose)
        └── Component Tokens (specific)

Example:
    oklch(45% 0.2 260) → --color-primary → bg-primary

2. Component Architecture

Base styles → Variants → Sizes → States → Overrides

Patterns

Pattern 1: CVA (Class Variance Authority) Components

// 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: {
      : ,
      : ,
    },
  }
)

  
   .<>,
    <typeof buttonVariants> {
  ?: 
}


  () {
    = asChild ?  : 
   (
    
  )
}


< variant= size=></>

Pattern 2: Compound Components (React 19)

// 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
}: .<> & { ref?: React.Ref<HTMLHeadingElement> }) {
   (
    
  )
}

  () {
   (
    
  )
}

  () {
   (
    
  )
}

  () {
   (
    
  )
}


<>
  
  
  
</>

Pattern 3: Form Components

// 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   ',
           && ' ',
          
        )}
        =
        =
        = ? `${}`  }
        {}
      />
      {error && (
        
          {error}
        
      )}
    
  )
}


 { cva,   }  

 labelVariants = (
  
)

  () {
   (
    
  )
}


 { useForm }  
 { zodResolver }  
 { z }  

 schema = z.({
  : z.().(),
  : z.().(, ),
})

 () {
   { register, handleSubmit, : { errors } } = ({
    : (schema),
  })

   (
    
  )
}

Pattern 4: Responsive Grid System

// 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  () {
   (
    
  )
}


 containerVariants = (, {
  : {
    : {
      : ,
      : ,
      : ,
      : ,
      : ,
      : ,
    },
  },
  : {
    : ,
  },
})

 
   .<>,
    <typeof containerVariants> {}

  () {
   (
    
  )
}


<>
  
</>

Pattern 5: Native CSS Animations (v4)

/* 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();
}

:popover-open {
  : ;
  : ();
}

 {
  :popover-open {
    : ;
    : ();
  }
}

// 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.> & {
  ref?: React.Ref<HTMLDivElement>
}) {
   (
    
  )
}

Pattern 6: Dark Mode with CSS (v4)

// 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
     (stored) (stored)
  }, [storageKey])

  ( {
     root = .
    root..(, )

     resolved = theme === 
      ? (.(). ?  : )
      : theme

    root..(resolved)
    (resolved)

    
     metaThemeColor = .()
     (metaThemeColor) {
      metaThemeColor.(, resolved ===  ?  : )
    }
  }, [theme])

   (
    
  )
}

   = () => {
   context = ()
   (!context)   ()
   context
}


 { ,  }  
 { useTheme }  

  () {
   { resolvedTheme, setTheme } = ()

   (
    
  )
}

Utility Functions

// lib/utils.ts
export { cn } from "cnfast";
export type { ClassValue } from "cnfast";

// 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:

/* 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 utility for text gradients */
@utility text-gradient {
  @apply bg-gradient-to-r from-primary to-accent bg-clip-text text-transparent;
}

Theme Modifiers

/* Use @theme inline when referencing other CSS variables */
@theme inline {
  --font-sans: var(--font-inter), system-ui;
}

/* Use @theme static to always generate CSS variables (even when unused) */
@theme static {
  --color-brand: oklch(65% 0.15 240);
}

/* Import with theme options */
@import "tailwindcss" theme(static);

Namespace Overrides

@theme {
  /* Clear all default colors and define your own */
  --color-*: initial;
  --color-white: #fff;
  --color-black: #000;
  --color-primary: oklch(45% 0.2 260);
  --color-secondary: oklch(65% 0.15 200);

  /* Clear ALL defaults for a minimal setup */
  /* --*: initial; */
}

Semi-transparent Color Variants

@theme {
  /* Use color-mix() for alpha variants */
  --color-primary-50: color-mix(in oklab, var(--color-primary) 5%, transparent);
  --color-primary-100: color-mix(
    in oklab,
    var(--color-primary) 10%,
    transparent
  );
  --color-primary-200: color-mix(
    in oklab,
    var(--color-primary) 20%,
    transparent
  );
}

Container Queries

@theme {
  --container-xs: 20rem;
  --container-sm: 24rem;
  --container-md: 28rem;
  --container-lg: 32rem;
}

v3 to v4 Migration Checklist

• Replace tailwind.config.ts with CSS @theme block
• Change @tailwind base/components/utilities to @import "tailwindcss"
• Move color definitions to @theme { --color-*: value }
• Replace darkMode: "class" with @custom-variant dark
• Move @keyframes inside @theme blocks (ensures keyframes output with theme)
• Replace require("tailwindcss-animate") with native CSS animations
• Update h-10 w-10 to size-10 (new utility)
• Remove forwardRef (React 19 passes ref as prop)
• Consider OKLCH colors for better color perception
• Replace custom plugins with @utility directives

Best Practices

Do's

• Use @theme blocks - CSS-first configuration is v4's core pattern
• Use OKLCH colors - Better perceptual uniformity than HSL
• Compose with CVA - Type-safe variants
• Use semantic tokens - bg-primary not bg-blue-500
• Use size-* - New shorthand for w-* h-*
• Add accessibility - ARIA attributes, focus states

Don'ts

• Don't use tailwind.config.ts - Use CSS @theme instead
• Don't use @tailwind directives - Use @import "tailwindcss"
• Don't use forwardRef - React 19 passes ref as prop
• Don't use arbitrary values - Extend @theme instead
• Don't hardcode colors - Use semantic tokens
• Don't forget dark mode - Test both themes

Resources

• Tailwind CSS v4 Documentation
• Tailwind v4 Beta Announcement
• CVA Documentation
• shadcn/ui
• Radix Primitives