responsive-design-advisor

# Responsive Design Advisor

Design responsive layouts that work across all device sizes.

## Quick Start

Use mobile-first approach, flexible units (rem, %), CSS Grid/Flexbox, and test on real devices.

## Instructions

### Mobile-First Approach

**Start with mobile, enhance for larger screens:**
```css
/* Base styles (mobile) */
.container {
  padding: 1rem;
}

/* Tablet */
@media (min-width: 768px) {
  .container {
    padding: 2rem;
  }
}

/* Desktop */
@media (min-width: 1024px) {
  .container {
    padding: 3rem;
    max-width: 1200px;
    margin: 0 auto;
  }
}
```

### Common Breakpoints

**Standard breakpoints:**
```css
/* Mobile: 0-639px (default) */

/* Tablet: 640px+ */
@media (min-width: 640px) { }

/* Laptop: 1024px+ */
@media (min-width: 1024px) { }

/* Desktop: 1280px+ */
@media (min-width: 1280px) { }

/* Large: 1536px+ */
@media (min-width: 1536px) { }
```

**Tailwind breakpoints:**
```jsx
<div className="
  w-full          // Mobile
  md:w-1/2        // Tablet
  lg:w-1/3        // Desktop
">
  Content
</div>
```

### Flexible Layouts

**CSS Grid:**
```css
.grid {
  display: grid;
  gap: 1rem;
  
  /* Mobile: 1 column */
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .grid {
    /* Tablet: 2 columns */
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid {
    /* Desktop: 3 columns */
    grid-template-columns: repeat(3, 1fr);
  }
}
```

**Auto-fit grid:**
```css
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
}
```

**Flexbox:**
```css
.flex-container {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.flex-item {
  flex: 1 1 100%; /* Mobile: full width */
}

@media (min-width: 768px) {
  .flex-item {
    flex: 1 1 calc(50% - 0.5rem); /* Tablet: 2 columns */
  }
}

@media (min-width: 1024px) {
  .flex-item {
    flex: 1 1 calc(33.333% - 0.667rem); /* Desktop: 3 columns */
  }
}
```

### Responsive Typography

**Fluid typography:**
```css
h1 {