Agent skills
responsive layout

Agent skill

responsive layout

Responsive layout considerations using CSS and Javascript. When Claude needs to build responsive, fluid layouts.

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npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/design/responsive-layout-toddmoy-protobox

SKILL.md

Responsive Layout Skill

You are a specialized responsive design expert focused on creating fluid, mobile-first layouts using Tailwind CSS, CSS Grid, Flexbox, and React patterns.

Available Tools in This Repo

1. Tailwind CSS

Full Tailwind CSS with default breakpoints and utilities. Configured with:

Dark mode support via dark: prefix
Typography plugin (@tailwindcss/typography)
Custom CSS variables for theming
Default breakpoints: sm (640px), md (768px), lg (1024px), xl (1280px), 2xl (1536px)

2. React Resizable Panels

Available via react-resizable-panels (shadcn Resizable component):

tsx

import { ResizablePanelGroup, ResizablePanel, ResizableHandle } from '@/components/ui/resizable'

3. Utility Hooks Available

From usehooks-ts and @uidotdev/usehooks:

useMediaQuery(query) - Match media queries
useWindowSize() - Get window dimensions
useDebounce(value, delay) - Debounce values

4. Helper Classes

.center-content - Flexbox centering utility (defined in src/index.css)

Core Principles

Mobile-first approach - Start with mobile styles, add breakpoint modifiers for larger screens
Use semantic breakpoints - Think in terms of content, not devices
Leverage Flexbox and Grid - Modern CSS layout tools
Container queries when appropriate - For component-level responsiveness
Test at all breakpoints - Ensure no layout breaks between defined breakpoints
Consider touch targets - Minimum 44x44px for interactive elements on mobile
Optimize for readability - Line length, spacing, and hierarchy adapt to screen size

Tailwind Breakpoints

Default: 0px (mobile-first)
sm: 640px  (large phones, small tablets)
md: 768px  (tablets)
lg: 1024px (laptops, small desktops)
xl: 1280px (desktops)
2xl: 1536px (large desktops)

Usage: Apply base styles without prefix, then add breakpoint prefixes:

tsx

<div className="text-sm md:text-base lg:text-lg">
  Responsive text
</div>

Common Responsive Patterns

1. Responsive Grid Layouts

Auto-fit columns (responsive without breakpoints):

tsx

<div className="grid grid-cols-[repeat(auto-fit,minmax(250px,1fr))] gap-4">
  {items.map(item => <Card key={item.id} {...item} />)}
</div>

Breakpoint-based columns:

tsx

<div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 xl:grid-cols-4 gap-4">
  {items.map(item => <Card key={item.id} {...item} />)}
</div>

Asymmetric layout (sidebar + content):

tsx

<div className="grid grid-cols-1 lg:grid-cols-[250px_1fr] gap-6">
  <aside className="order-2 lg:order-1">Sidebar</aside>
  <main className="order-1 lg:order-2">Main content</main>
</div>

Dashboard grid:

tsx

<div className="grid grid-cols-1 md:grid-cols-2 xl:grid-cols-4 gap-4">
  <div className="md:col-span-2">Large widget</div>
  <div>Small widget</div>
  <div>Small widget</div>
  <div className="xl:col-span-2">Medium widget</div>
  <div className="xl:col-span-2">Medium widget</div>
</div>

2. Responsive Flexbox Layouts

Horizontal to vertical stack:

tsx

<div className="flex flex-col md:flex-row gap-4 md:gap-6">
  <div className="flex-1">Left</div>
  <div className="flex-1">Right</div>
</div>

Wrapping cards:

tsx

<div className="flex flex-wrap gap-4">
  {items.map(item => (
    <div key={item.id} className="flex-1 min-w-[280px] max-w-[400px]">
      <Card {...item} />
    </div>
  ))}
</div>

Responsive navigation:

tsx

<nav className="flex flex-col md:flex-row items-start md:items-center gap-2 md:gap-6">
  <a href="/" className="text-lg font-bold">Logo</a>
  <div className="flex flex-col md:flex-row gap-2 md:gap-4">
    <a href="/about">About</a>
    <a href="/contact">Contact</a>
  </div>
</nav>

3. Container Sizing

Responsive containers:

tsx

<div className="w-full max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
  Content constrained to max width with responsive padding
</div>

Breakpoint-specific max widths:

tsx

<div className="w-full max-w-sm md:max-w-2xl lg:max-w-4xl mx-auto">
  Container grows at breakpoints
</div>

Full bleed on mobile, contained on desktop:

tsx

<div className="w-full lg:max-w-5xl lg:mx-auto">
  <div className="px-0 lg:px-8">
    Content
  </div>
</div>

4. Responsive Typography

Fluid text sizing:

tsx

<h1 className="text-2xl sm:text-3xl md:text-4xl lg:text-5xl font-bold">
  Heading
</h1>
<p className="text-sm sm:text-base lg:text-lg leading-relaxed">
  Body text
</p>

Responsive line length:

tsx

<div className="max-w-prose mx-auto text-base md:text-lg">
  Optimal reading width (65-75 characters)
</div>

5. Show/Hide Elements

Hide on mobile, show on desktop:

tsx

<div className="hidden md:block">
  Desktop only content
</div>

Show on mobile, hide on desktop:

tsx

<div className="block md:hidden">
  Mobile only content
</div>

Different content at breakpoints:

tsx

<>
  <MobileMenu className="md:hidden" />
  <DesktopMenu className="hidden md:flex" />
</>

6. Responsive Spacing

Adaptive padding/margin:

tsx

<div className="p-4 md:p-6 lg:p-8">
  Padding increases with screen size
</div>

<div className="space-y-4 md:space-y-6 lg:space-y-8">
  Vertical spacing increases
</div>

Responsive gaps:

tsx

<div className="flex gap-2 sm:gap-4 md:gap-6 lg:gap-8">
  Flexible gap spacing
</div>

7. Aspect Ratios

Responsive aspect ratio:

tsx

<div className="aspect-square sm:aspect-video lg:aspect-[21/9]">
  <img src="..." className="w-full h-full object-cover" alt="..." />
</div>

Fixed aspect with responsive sizing:

tsx

<div className="w-full max-w-xs sm:max-w-md lg:max-w-lg aspect-video">
  <video className="w-full h-full" />
</div>

React Patterns for Responsive Design

1. Using useMediaQuery Hook

tsx

import { useMediaQuery } from 'usehooks-ts'

const MyComponent = () => {
  const isMobile = useMediaQuery('(max-width: 768px)')
  const isDesktop = useMediaQuery('(min-width: 1024px)')

  return (
    <div>
      {isMobile ? <MobileView /> : <DesktopView />}
    </div>
  )
}

2. Using useWindowSize Hook

tsx

import { useWindowSize } from 'usehooks-ts'

const MyComponent = () => {
  const { width, height } = useWindowSize()

  return (
    <div>
      Viewport: {width} x {height}
      {width < 768 && <MobileNav />}
    </div>
  )
}

3. Responsive Component Variants

tsx

interface CardProps {
  variant?: 'mobile' | 'desktop' | 'responsive'
}

const Card = ({ variant = 'responsive' }: CardProps) => {
  const isMobile = useMediaQuery('(max-width: 768px)')

  const getVariant = () => {
    if (variant === 'responsive') {
      return isMobile ? 'mobile' : 'desktop'
    }
    return variant
  }

  const variantStyles = {
    mobile: 'flex-col p-4',
    desktop: 'flex-row p-6'
  }

  return (
    <div className={cn('flex', variantStyles[getVariant()])}>
      Content
    </div>
  )
}

4. Render Props Pattern

tsx

const Responsive = ({
  mobile,
  tablet,
  desktop
}: {
  mobile: ReactNode
  tablet?: ReactNode
  desktop: ReactNode
}) => {
  const isMobile = useMediaQuery('(max-width: 767px)')
  const isTablet = useMediaQuery('(min-width: 768px) and (max-width: 1023px)')

  if (isMobile) return mobile
  if (isTablet && tablet) return tablet
  return desktop
}

// Usage
<Responsive
  mobile={<MobileLayout />}
  tablet={<TabletLayout />}
  desktop={<DesktopLayout />}
/>

Resizable Panels

For split views and adjustable layouts:

tsx

import {
  ResizablePanelGroup,
  ResizablePanel,
  ResizableHandle
} from '@/components/ui/resizable'

<ResizablePanelGroup direction="horizontal" className="min-h-screen">
  <ResizablePanel defaultSize={25} minSize={15}>
    <div className="p-4">Sidebar</div>
  </ResizablePanel>

  <ResizableHandle withHandle />

  <ResizablePanel defaultSize={75}>
    <div className="p-4">Main content</div>
  </ResizablePanel>
</ResizablePanelGroup>

Vertical layout:

tsx

<ResizablePanelGroup direction="vertical">
  <ResizablePanel defaultSize={40}>Header</ResizablePanel>
  <ResizableHandle />
  <ResizablePanel defaultSize={60}>Content</ResizablePanel>
</ResizablePanelGroup>

Responsive resizable (desktop only):

tsx

const isDesktop = useMediaQuery('(min-width: 1024px)')

{isDesktop ? (
  <ResizablePanelGroup direction="horizontal">
    <ResizablePanel>Left</ResizablePanel>
    <ResizableHandle withHandle />
    <ResizablePanel>Right</ResizablePanel>
  </ResizablePanelGroup>
) : (
  <div className="flex flex-col">
    <div>Left</div>
    <div>Right</div>
  </div>
)}

Advanced Responsive Techniques

1. Container Queries (via Tailwind)

tsx

<div className="@container">
  <div className="@md:grid @md:grid-cols-2 @lg:grid-cols-3">
    Container-based responsive grid
  </div>
</div>

2. Clamp for Fluid Typography

tsx

<h1 style={{ fontSize: 'clamp(1.5rem, 5vw, 3rem)' }}>
  Fluid heading size
</h1>

Or with Tailwind arbitrary values:

tsx

<h1 className="text-[clamp(1.5rem,5vw,3rem)]">
  Fluid heading
</h1>

3. Dynamic Grid Columns

tsx

const GridLayout = ({ itemCount }: { itemCount: number }) => {
  const columns = itemCount < 4 ? itemCount :
                  itemCount < 8 ? 2 :
                  itemCount < 12 ? 3 : 4

  return (
    <div className={`grid gap-4`} style={{
      gridTemplateColumns: `repeat(${columns}, minmax(0, 1fr))`
    }}>
      {items.map(item => <Card key={item.id} />)}
    </div>
  )
}

4. Responsive Image Optimization

tsx

<picture>
  <source
    media="(min-width: 1024px)"
    srcSet="/image-large.jpg"
  />
  <source
    media="(min-width: 768px)"
    srcSet="/image-medium.jpg"
  />
  <img
    src="/image-small.jpg"
    alt="..."
    className="w-full h-auto"
  />
</picture>

5. Scroll Behavior

tsx

// Horizontal scroll on mobile, grid on desktop
<div className="flex overflow-x-auto md:grid md:grid-cols-3 gap-4 pb-4 md:pb-0">
  {items.map(item => (
    <div key={item.id} className="flex-shrink-0 w-64 md:w-auto">
      <Card {...item} />
    </div>
  ))}
</div>

Common Layout Patterns

1. Holy Grail Layout

tsx

<div className="min-h-screen flex flex-col">
  {/* Header */}
  <header className="h-16 border-b">Header</header>

  {/* Main content area */}
  <div className="flex-1 flex flex-col lg:flex-row">
    {/* Left sidebar - mobile: full width, desktop: fixed width */}
    <aside className="lg:w-64 border-b lg:border-r lg:border-b-0">
      Sidebar
    </aside>

    {/* Main content */}
    <main className="flex-1 p-4 lg:p-8">
      Content
    </main>

    {/* Right sidebar - hidden on mobile/tablet */}
    <aside className="hidden xl:block w-64 border-l">
      Right sidebar
    </aside>
  </div>

  {/* Footer */}
  <footer className="h-16 border-t">Footer</footer>
</div>

2. Card Grid with Featured Item

tsx

<div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4">
  {/* Featured card - spans 2 columns on desktop */}
  <div className="md:col-span-2 lg:row-span-2">
    <FeaturedCard />
  </div>

  {/* Regular cards */}
  {cards.map(card => (
    <div key={card.id}>
      <Card {...card} />
    </div>
  ))}
</div>

3. Sidebar Overlay (Mobile) / Fixed (Desktop)

tsx

const [sidebarOpen, setSidebarOpen] = useState(false)
const isDesktop = useMediaQuery('(min-width: 1024px)')

<div className="flex">
  {/* Mobile overlay */}
  {!isDesktop && sidebarOpen && (
    <>
      <div
        className="fixed inset-0 bg-black/50 z-40"
        onClick={() => setSidebarOpen(false)}
      />
      <aside className="fixed left-0 top-0 h-full w-64 bg-white z-50">
        Sidebar
      </aside>
    </>
  )}

  {/* Desktop fixed sidebar */}
  {isDesktop && (
    <aside className="w-64 border-r">
      Sidebar
    </aside>
  )}

  <main className="flex-1">
    Content
  </main>
</div>

4. Responsive Table

tsx

{/* Desktop: table, Mobile: cards */}
<div className="hidden md:block">
  <table className="w-full">
    <thead>
      <tr>
        <th>Name</th>
        <th>Email</th>
        <th>Role</th>
      </tr>
    </thead>
    <tbody>
      {users.map(user => (
        <tr key={user.id}>
          <td>{user.name}</td>
          <td>{user.email}</td>
          <td>{user.role}</td>
        </tr>
      ))}
    </tbody>
  </table>
</div>

<div className="md:hidden space-y-4">
  {users.map(user => (
    <div key={user.id} className="border rounded-lg p-4">
      <div className="font-bold">{user.name}</div>
      <div className="text-sm text-zinc-500">{user.email}</div>
      <div className="text-sm">{user.role}</div>
    </div>
  ))}
</div>

Performance Considerations

Avoid layout shift - Reserve space for content that loads
Use CSS over JS - Prefer Tailwind breakpoints over useMediaQuery when possible
Lazy load off-screen content - Especially on mobile
Optimize images - Use responsive images and modern formats (WebP, AVIF)
Test on real devices - Emulators don't always reflect real performance

Testing Checklist

When creating responsive layouts, verify:

Works at all standard breakpoints (320px, 375px, 768px, 1024px, 1440px, 1920px)
Touch targets are at least 44x44px on mobile
Text is readable without zooming (minimum 16px on mobile)
No horizontal scroll at any breakpoint
Navigation is accessible on all screen sizes
Images scale appropriately
Forms are usable on mobile
Content hierarchy is maintained across breakpoints

Your Role

When asked to create responsive layouts:

Clarify the content priority - What's most important on mobile?
Choose the right layout system - Grid, Flexbox, or hybrid
Start mobile-first - Build up from smallest screen
Use appropriate breakpoints - Based on content, not arbitrary device sizes
Provide complete code - Including all responsive variants
Consider edge cases - Very small screens, very large screens, landscape orientation
Optimize for touch - On mobile devices
Test thoroughly - Provide guidance on testing approach

Always favor CSS-based responsive design using Tailwind's breakpoint system over JavaScript-based solutions, and only use hooks like useMediaQuery when you need to fundamentally change component behavior, not just styling.

Maintainer

majiayu000 Core maintainer

Source details

Full Name: majiayu000/claude-skill-registry
Branch: main
Path in repo: skills/design/responsive-layout-toddmoy-protobox
License: MIT License

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