Responsive Design

Responsive Design

Master modern responsive design techniques to create interfaces that adapt seamlessly across all screen sizes and device contexts.

When to Use This Skill

• Implementing mobile-first responsive layouts
• Using container queries for component-based responsiveness
• Creating fluid typography and spacing scales
• Building complex layouts with CSS Grid and Flexbox
• Designing breakpoint strategies for design systems
• Implementing responsive images and media
• Creating adaptive navigation patterns
• Building responsive tables and data displays

Core Capabilities

1. Container Queries

• Component-level responsiveness independent of viewport
• Container query units (cqi, cqw, cqh)
• Style queries for conditional styling
• Fallbacks for browser support

2. Fluid Typography & Spacing

• CSS clamp() for fluid scaling
• Viewport-relative units (vw, vh, dvh)
• Fluid type scales with min/max bounds
• Responsive spacing systems

3. Layout Patterns

• CSS Grid for 2D layouts
• Flexbox for 1D distribution
• Intrinsic layouts (content-based sizing)
• Subgrid for nested grid alignment

4. Breakpoint Strategy

• Mobile-first media queries
• Content-based breakpoints
• Design token integration
• Feature queries (@supports)

Quick Reference

Modern Breakpoint Scale

/* Mobile-first breakpoints */
/* Base: Mobile (< 640px) */
@media (min-width: 640px) {
    /* sm: Landscape phones, small tablets */
}
@media (min-width: 768px) {
    /* md: Tablets */
}
@media (min-width: 1024px) {
    /* lg: Laptops, small desktops */
}
@media (min-width: 1280px) {
    /* xl: Desktops */
}
@media (min-width: 1536px) {
    /* 2xl: Large desktops */
}

/* Tailwind CSS equivalent */
/* sm:  @media (min-width: 640px) */
/* md:  @media (min-width: 768px) */
/* lg:  @media (min-width: 1024px) */
/* xl:  @media (min-width: 1280px) */
/* 2xl: @media (min-width: 1536px) */

Key Patterns

Pattern 1: Container Queries

/* Define a containment context */
.card-container {
    container-type: inline-size;
    container-name: card;
}

/* Query the container, not the viewport */
@container card (min-width: 400px) {
    .card {
        display: grid;
        grid-template-columns: 200px 1fr;
        gap: 1rem;
    }

    .card-image {
        aspect-ratio: 1;
    }
}

@container card (min-width: 600px) {
    .card {
        grid-template-columns: 250px 1fr;
    }

    .card-title {
        font-size: 1.5rem;
    }
}

/* Container query units */
.card-title {
    /* 5% of container width, clamped between 1rem and 2rem */
    font-size: clamp(1rem, 5cqi, 2rem);
}

// React component with container queries
function ResponsiveCard({ title, image, description }) {
    return (
        <div className="@container">
            <article className="flex flex-col @md:flex-row @md:gap-4">
                <img
                    src={image}
                    alt=""
                    className="w-full @md:w-48 @lg:w-64 aspect-video @md:aspect-square object-cover"
                />
                <div className="p-4 @md:p-0">
                    <h2 className="text-lg @md:text-xl @lg:text-2xl font-semibold">
                        {title}
                    </h2>
                    <p className="mt-2 text-muted-foreground @md:line-clamp-3">
                        {description}
                    </p>
                </div>
            </article>
        </div>
    );
}

Pattern 2: Fluid Typography

/* Fluid type scale using clamp() */
:root {
    /* Min size, preferred (fluid), max size */
    --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
    --text-sm: clamp(0.875rem, 0.8rem + 0.375vw, 1rem);
    --text-base: clamp(1rem, 0.9rem + 0.5vw, 1.125rem);
    --text-lg: clamp(1.125rem, 1rem + 0.625vw, 1.25rem);
    --text-xl: clamp(1.25rem, 1rem + 1.25vw, 1.5rem);
    --text-2xl: clamp(1.5rem, 1.25rem + 1.25vw, 2rem);
    --text-3xl: clamp(1.875rem, 1.5rem + 1.875vw, 2.5rem);
    --text-4xl: clamp(2.25rem, 1.75rem + 2.5vw, 3.5rem);
}

/* Usage */
h1 {
    font-size: var(--text-4xl);
}
h2 {
    font-size: var(--text-3xl);
}
h3 {
    font-size: var(--text-2xl);
}
p {
    font-size: var(--text-base);
}

/* Fluid spacing scale */
:root {
    --space-xs: clamp(0.25rem, 0.2rem + 0.25vw, 0.5rem);
    --space-sm: clamp(0.5rem, 0.4rem + 0.5vw, 0.75rem);
    --space-md: clamp(1rem, 0.8rem + 1vw, 1.5rem);
    --space-lg: clamp(1.5rem, 1.2rem + 1.5vw, 2.5rem);
    --space-xl: clamp(2rem, 1.5rem + 2.5vw, 4rem);
}

// Utility function for fluid values
function fluidValue(
    minSize: number,
    maxSize: number,
    minWidth = 320,
    maxWidth = 1280
) {
    const slope = (maxSize - minSize) / (maxWidth - minWidth);
    const yAxisIntersection = -minWidth * slope + minSize;

    return `clamp(${minSize}rem, ${yAxisIntersection.toFixed(4)}rem + ${(slope * 100).toFixed(4)}vw, ${maxSize}rem)`;
}

// Generate fluid type scale
const fluidTypeScale = {
    sm: fluidValue(0.875, 1),
    base: fluidValue(1, 1.125),
    lg: fluidValue(1.25, 1.5),
    xl: fluidValue(1.5, 2),
    "2xl": fluidValue(2, 3),
};

Pattern 3: CSS Grid Responsive Layout

/* Auto-fit grid - items wrap automatically */
.grid-auto {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(300px, 100%), 1fr));
    gap: 1.5rem;
}

/* Auto-fill grid - maintains empty columns */
.grid-auto-fill {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1rem;
}

/* Responsive grid with named areas */
.page-layout {
    display: grid;
    grid-template-areas:
        "header"
        "main"
        "sidebar"
        "footer";
    gap: 1rem;
}

@media (min-width: 768px) {
    .page-layout {
        grid-template-columns: 1fr 300px;
        grid-template-areas:
            "header header"
            "main sidebar"
            "footer footer";
    }
}

@media (min-width: 1024px) {
    .page-layout {
        grid-template-columns: 250px 1fr 300px;
        grid-template-areas:
            "header header header"
            "nav main sidebar"
            "footer footer footer";
    }
}

.header {
    grid-area: header;
}
.main {
    grid-area: main;
}
.sidebar {
    grid-area: sidebar;
}
.footer {
    grid-area: footer;
}

// Responsive grid component
function ResponsiveGrid({ children, minItemWidth = "250px", gap = "1.5rem" }) {
    return (
        <div
            className="grid"
            style={{
                gridTemplateColumns: `repeat(auto-fit, minmax(min(${minItemWidth}, 100%), 1fr))`,
                gap,
            }}
        >
            {children}
        </div>
    );
}

// Usage with Tailwind
function ProductGrid({ products }) {
    return (
        <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 xl:grid-cols-4 gap-4 md:gap-6">
            {products.map((product) => (
                <ProductCard key={product.id} product={product} />
            ))}
        </div>
    );
}

Pattern 4: Responsive Navigation

function ResponsiveNav({ items }) {
    const [isOpen, setIsOpen] = useState(false);

    return (
        <nav className="relative">
            {/* Mobile menu button */}
            <button
                className="lg:hidden p-2"
                => setIsOpen(!isOpen)}
                aria-expanded={isOpen}
                aria-controls="nav-menu"
            >
                <span className="sr-only">Toggle navigation</span>
                {isOpen ? <X /> : <Menu />}
            </button>

            {/* Navigation links */}
            <ul
                id="nav-menu"
                className={cn(
                    // Base: hidden on mobile
                    "absolute top-full left-0 right-0 bg-background border-b",
                    "flex flex-col",
                    // Mobile: slide down
                    isOpen ? "flex" : "hidden",
                    // Desktop: always visible, horizontal
                    "lg:static lg:flex lg:flex-row lg:border-0 lg:bg-transparent"
                )}
            >
                {items.map((item) => (
                    <li key={item.href}>
                        <a
                            href={item.href}
                            className={cn(
                                "block px-4 py-3",
                                "lg:px-3 lg:py-2",
                                "hover:bg-muted lg:hover:bg-transparent lg:hover:text-primary"
                            )}
                        >
                            {item.label}
                        </a>
                    </li>
                ))}
            </ul>
        </nav>
    );
}

Pattern 5: Responsive Images

// Responsive image with art direction
function ResponsiveHero() {
    return (
        <picture>
            {/* Art direction: different crops for different screens */}
            <source
                media="(min-width: 1024px)"
                srcSet="/hero-wide.webp"
                type="image/webp"
            />
            <source
                media="(min-width: 768px)"
                srcSet="/hero-medium.webp"
                type="image/webp"
            />
            <source srcSet="/hero-mobile.webp" type="image/webp" />

            {/* Fallback */}
            <img
                src="/hero-mobile.jpg"
                alt="Hero image description"
                className="w-full h-auto"
                loading="eager"
                fetchpriority="high"
            />
        </picture>
    );
}

// Responsive image with srcset for resolution switching
function ProductImage({ product }) {
    return (
        <img
            src={product.image}
            srcSet={`
        ${product.image}?w=400 400w,
        ${product.image}?w=800 800w,
        ${product.image}?w=1200 1200w
      `}
            sizes="(max-width: 640px) 100vw, (max-width: 1024px) 50vw, 33vw"
            alt={product.name}
            className="w-full h-auto object-cover"
            loading="lazy"
        />
    );
}

Pattern 6: Responsive Tables

// Responsive table with horizontal scroll
function ResponsiveTable({ data, columns }) {
    return (
        <div className="w-full overflow-x-auto">
            <table className="w-full min-w-[600px]">
                <thead>
                    <tr>
                        {columns.map((col) => (
                            <th key={col.key} className="text-left p-3">
                                {col.label}
                            </th>
                        ))}
                    </tr>
                </thead>
                <tbody>
                    {data.map((row, i) => (
                        <tr key={i} className="border-t">
                            {columns.map((col) => (
                                <td key={col.key} className="p-3">
                                    {row[col.key]}
                                </td>
                            ))}
                        </tr>
                    ))}
                </tbody>
            </table>
        </div>
    );
}

// Card-based table for mobile
function ResponsiveDataTable({ data, columns }) {
    return (
        <>
            {/* Desktop table */}
            <table className="hidden md:table w-full">
                {/* ... standard table */}
            </table>

            {/* Mobile cards */}
            <div className="md:hidden space-y-4">
                {data.map((row, i) => (
                    <div key={i} className="border rounded-lg p-4 space-y-2">
                        {columns.map((col) => (
                            <div key={col.key} className="flex justify-between">
                                <span className="font-medium text-muted-foreground">
                                    {col.label}
                                </span>
                                <span>{row[col.key]}</span>
                            </div>
                        ))}
                    </div>
                ))}
            </div>
        </>
    );
}

Viewport Units

/* Standard viewport units */
.full-height {
    height: 100vh; /* May cause issues on mobile */
}

/* Dynamic viewport units (recommended for mobile) */
.full-height-dynamic {
    height: 100dvh; /* Accounts for mobile browser UI */
}

/* Small viewport (minimum) */
.min-full-height {
    min-height: 100svh;
}

/* Large viewport (maximum) */
.max-full-height {
    max-height: 100lvh;
}

/* Viewport-relative font sizing */
.hero-title {
    /* 5vw with min/max bounds */
    font-size: clamp(2rem, 5vw, 4rem);
}

Best Practices

1. Mobile-First: Start with mobile styles, enhance for larger screens
2. Content Breakpoints: Set breakpoints based on content, not devices
3. Fluid Over Fixed: Use fluid values for typography and spacing
4. Container Queries: Use for component-level responsiveness
5. Test Real Devices: Simulators don't catch all issues
6. Performance: Optimize images, lazy load off-screen content
7. Touch Targets: Maintain 44x44px minimum on mobile
8. Logical Properties: Use inline/block for internationalization

Common Issues

• Horizontal Overflow: Content breaking out of viewport
• Fixed Widths: Using px instead of relative units
• Viewport Height: 100vh issues on mobile browsers
• Font Size: Text too small on mobile
• Touch Targets: Buttons too small to tap accurately
• Aspect Ratio: Images squishing or stretching
• Z-Index Stacking: Overlays breaking on different screens

Resources

• CSS Container Queries
• Utopia Fluid Type Calculator
• Every Layout
• Responsive Images Guide
• CSS Grid Garden

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