Tailwind Design System

Tailwind Design System

Build production-ready design systems with Tailwind CSS, including design tokens, component variants, responsive patterns, and accessibility.

When to Use This Skill

• Creating a component library with Tailwind
• Implementing design tokens and theming
• Building responsive and accessible components
• Standardizing UI patterns across a codebase
• Migrating to or extending Tailwind CSS
• Setting up dark mode and color schemes

Core Concepts

1. Design Token Hierarchy

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

Example:
    blue-500 → primary → button-bg

2. Component Architecture

Base styles → Variants → Sizes → States → Overrides

Quick Start

// tailwind.config.ts
import type { Config } from 'tailwindcss';

const config: Config = {
  content: ['./src/**/*.{js,ts,jsx,tsx,mdx}'],
  darkMode: 'class',
  theme: {
    extend: {
      colors: {
        // Semantic color tokens
        primary: {
          DEFAULT: 'hsl(var(--primary))',
          foreground: 'hsl(var(--primary-foreground))',
        },
        secondary: {
          DEFAULT: 'hsl(var(--secondary))',
          foreground: 'hsl(var(--secondary-foreground))',
        },
        destructive: {
          DEFAULT: 'hsl(var(--destructive))',
          foreground: 'hsl(var(--destructive-foreground))',
        },
        muted: {
          DEFAULT: 'hsl(var(--muted))',
          foreground: 'hsl(var(--muted-foreground))',
        },
        accent: {
          DEFAULT: 'hsl(var(--accent))',
          foreground: 'hsl(var(--accent-foreground))',
        },
        background: 'hsl(var(--background))',
        foreground: 'hsl(var(--foreground))',
        border: 'hsl(var(--border))',
        ring: 'hsl(var(--ring))',
      },
      borderRadius: {
        lg: 'var(--radius)',
        md: 'calc(var(--radius) - 2px)',
        sm: 'calc(var(--radius) - 4px)',
      },
    },
  },
  plugins: [require('tailwindcss-animate')],
};

export default config;

/* globals.css */
@tailwind base;
@tailwind components;
@tailwind utilities;

@layer base {
  :root {
    --background: 0 0% 100%;
    --foreground: 222.2 84% 4.9%;
    --primary: 222.2 47.4% 11.2%;
    --primary-foreground: 210 40% 98%;
    --secondary: 210 40% 96.1%;
    --secondary-foreground: 222.2 47.4% 11.2%;
    --muted: 210 40% 96.1%;
    --muted-foreground: 215.4 16.3% 46.9%;
    --accent: 210 40% 96.1%;
    --accent-foreground: 222.2 47.4% 11.2%;
    --destructive: 0 84.2% 60.2%;
    --destructive-foreground: 210 40% 98%;
    --border: 214.3 31.8% 91.4%;
    --ring: 222.2 84% 4.9%;
    --radius: 0.5rem;
  }

  .dark {
    --background: 222.2 84% 4.9%;
    --foreground: 210 40% 98%;
    --primary: 210 40% 98%;
    --primary-foreground: 222.2 47.4% 11.2%;
    --secondary: 217.2 32.6% 17.5%;
    --secondary-foreground: 210 40% 98%;
    --muted: 217.2 32.6% 17.5%;
    --muted-foreground: 215 20.2% 65.1%;
    --accent: 217.2 32.6% 17.5%;
    --accent-foreground: 210 40% 98%;
    --destructive: 0 62.8% 30.6%;
    --destructive-foreground: 210 40% 98%;
    --border: 217.2 32.6% 17.5%;
    --ring: 212.7 26.8% 83.9%;
  }
}

Patterns

Pattern 1: CVA (Class Variance Authority) Components

// components/ui/button.tsx
import { cva, type VariantProps } from 'class-variance-authority'
import { forwardRef } from 'react'
import { cn } from '@/lib/utils'

const buttonVariants = cva(
  // Base styles
  'inline-flex items-center justify-center 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',
  {
    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-input 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: 'h-10 w-10',
      },
    },
    defaultVariants: {
      variant: 'default',
      size: 'default',
    },
  }
)

export interface ButtonProps
  extends React.ButtonHTMLAttributes<HTMLButtonElement>,
    VariantProps<typeof buttonVariants> {
  asChild?: boolean
}

const Button = forwardRef<HTMLButtonElement, ButtonProps>(
  ({ className, variant, size, asChild = false, ...props }, ref) => {
    const Comp = asChild ? Slot : 'button'
    return (
      <Comp
        className={cn(buttonVariants({ variant, size, className }))}
        ref={ref}
        {...props}
      />
    )
  }
)
Button.displayName = 'Button'

export { Button, buttonVariants }

// 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

// components/ui/card.tsx
import { cn } from '@/lib/utils';
import { forwardRef } from 'react';

const Card = forwardRef<HTMLDivElement, React.HTMLAttributes<HTMLDivElement>>(({ className, ...props }, ref) => (
  <div ref={ref} className={cn('rounded-lg border bg-card text-card-foreground shadow-sm', className)} {...props} />
));
Card.displayName = 'Card';

const CardHeader = forwardRef<HTMLDivElement, React.HTMLAttributes<HTMLDivElement>>(({ className, ...props }, ref) => (
  <div ref={ref} className={cn('flex flex-col space-y-1.5 p-6', className)} {...props} />
));
CardHeader.displayName = 'CardHeader';

const CardTitle = forwardRef<HTMLHeadingElement, React.HTMLAttributes<HTMLHeadingElement>>(
  ({ className, ...props }, ref) => (
    <h3 ref={ref} className={cn('text-2xl font-semibold leading-none tracking-tight', className)} {...props} />
  )
);
CardTitle.displayName = 'CardTitle';

const CardDescription = forwardRef<HTMLParagraphElement, React.HTMLAttributes<HTMLParagraphElement>>(
  ({ className, ...props }, ref) => (
    <p ref={ref} className={cn('text-sm text-muted-foreground', className)} {...props} />
  )
);
CardDescription.displayName = 'CardDescription';

const CardContent = forwardRef<HTMLDivElement, React.HTMLAttributes<HTMLDivElement>>(({ className, ...props }, ref) => (
  <div ref={ref} className={cn('p-6 pt-0', className)} {...props} />
));
CardContent.displayName = 'CardContent';

const CardFooter = forwardRef<HTMLDivElement, React.HTMLAttributes<HTMLDivElement>>(({ className, ...props }, ref) => (
  <div ref={ref} className={cn('flex items-center p-6 pt-0', className)} {...props} />
));
CardFooter.displayName = 'CardFooter';

export { Card, CardHeader, CardTitle, CardDescription, CardContent, CardFooter };

// 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

// components/ui/input.tsx
import { forwardRef } from 'react';
import { cn } from '@/lib/utils';

export interface InputProps extends React.InputHTMLAttributes<HTMLInputElement> {
  error?: string;
}

const Input = forwardRef<HTMLInputElement, InputProps>(({ className, type, error, ...props }, ref) => {
  return (
    <div className="relative">
      <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 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>
  );
});
Input.displayName = 'Input';

// 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');

const Label = forwardRef<HTMLLabelElement, React.LabelHTMLAttributes<HTMLLabelElement>>(
  ({ className, ...props }, ref) => <label ref={ref} className={cn(labelVariants(), className)} {...props} />
);
Label.displayName = 'Label';

// Usage with React Hook Form
import { useForm } from 'react-hook-form';
import { zodResolver } from '@hookform/resolvers/zod';
import * as 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 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

// 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: Animation Utilities

// lib/animations.ts - Tailwind CSS Animate utilities
import { cn } from './utils';

export const fadeIn = 'animate-in fade-in duration-300';
export const fadeOut = 'animate-out fade-out duration-300';
export const slideInFromTop = 'animate-in slide-in-from-top duration-300';
export const slideInFromBottom = 'animate-in slide-in-from-bottom duration-300';
export const slideInFromLeft = 'animate-in slide-in-from-left duration-300';
export const slideInFromRight = 'animate-in slide-in-from-right duration-300';
export const zoomIn = 'animate-in zoom-in-95 duration-300';
export const zoomOut = 'animate-out zoom-out-95 duration-300';

// Compound animations
export const modalEnter = cn(fadeIn, zoomIn, 'duration-200');
export const modalExit = cn(fadeOut, zoomOut, 'duration-200');
export const dropdownEnter = cn(fadeIn, slideInFromTop, 'duration-150');
export const dropdownExit = cn(fadeOut, 'slide-out-to-top', 'duration-150');

// components/ui/dialog.tsx
import * as DialogPrimitive from '@radix-ui/react-dialog';

const DialogOverlay = forwardRef<
  React.ElementRef<typeof DialogPrimitive.Overlay>,
  React.ComponentPropsWithoutRef<typeof DialogPrimitive.Overlay>
>(({ className, ...props }, ref) => (
  <DialogPrimitive.Overlay
    ref={ref}
    className={cn(
      'fixed inset-0 z-50 bg-black/80',
      'data-[state=open]:animate-in data-[state=closed]:animate-out',
      'data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0',
      className
    )}
    {...props}
  />
));

const DialogContent = forwardRef<
  React.ElementRef<typeof DialogPrimitive.Content>,
  React.ComponentPropsWithoutRef<typeof DialogPrimitive.Content>
>(({ className, children, ...props }, ref) => (
  <DialogPortal>
    <DialogOverlay />
    <DialogPrimitive.Content
      ref={ref}
      className={cn(
        'fixed left-[50%] top-[50%] z-50 grid w-full max-w-lg translate-x-[-50%] translate-y-[-50%] gap-4 border bg-background p-6 shadow-lg',
        '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-[state=closed]:slide-out-to-left-1/2 data-[state=closed]:slide-out-to-top-[48%]',
        'data-[state=open]:slide-in-from-left-1/2 data-[state=open]:slide-in-from-top-[48%]',
        'sm:rounded-lg',
        className
      )}
      {...props}
    >
      {children}
    </DialogPrimitive.Content>
  </DialogPortal>
));

Pattern 6: Dark Mode Implementation

// providers/ThemeProvider.tsx
'use client';

import { createContext, useContext, useEffect, useState } from 'react';

type Theme = 'dark' | 'light' | 'system';

interface ThemeProviderProps {
  children: React.ReactNode;
  defaultTheme?: Theme;
  storageKey?: string;
}

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' }: ThemeProviderProps) {
  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 = window.document.documentElement;
    root.classList.remove('light', 'dark');

    let resolved: 'dark' | 'light';

    if (theme === 'system') {
      resolved = window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light';
    } else {
      resolved = theme;
    }

    root.classList.add(resolved);
    setResolvedTheme(resolved);
  }, [theme]);

  const value = {
    theme,
    setTheme: (newTheme: Theme) => {
      localStorage.setItem(storageKey, newTheme);
      setTheme(newTheme);
    },
    resolvedTheme,
  };

  return <ThemeContext.Provider value={value}>{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" => setTheme(resolvedTheme === 'dark' ? 'light' : 'dark')}>
      <Sun className="h-5 w-5 rotate-0 scale-100 transition-all dark:-rotate-90 dark:scale-0" />
      <Moon className="absolute h-5 w-5 rotate-90 scale-0 transition-all dark:rotate-0 dark:scale-100" />
      <span className="sr-only">Toggle theme</span>
    </Button>
  );
}

Utility Functions

// 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';

Best Practices

Do's

• Use CSS variables - Enable runtime theming
• Compose with CVA - Type-safe variants
• Use semantic colors - primary not blue-500
• Forward refs - Enable composition
• Add accessibility - ARIA attributes, focus states

Don'ts

• Don't use arbitrary values - Extend theme instead
• Don't nest @apply - Hurts readability
• Don't skip focus states - Keyboard users need them
• Don't hardcode colors - Use semantic tokens
• Don't forget dark mode - Test both themes

Resources

• Tailwind CSS Documentation
• CVA Documentation
• shadcn/ui
• Radix Primitives