Responsive Design

Responsive Design Skill

Purpose

Create web interfaces that work well across all device sizes and orientations.

Core Principles

1. Mobile-First

Design for mobile first, then enhance for larger screens.

/* Mobile styles (default) */
.container { padding: 1rem; }

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

/* Desktop and up */
@media (min-width: 1024px) {
  .container { padding: 3rem; max-width: 1200px; }
}

2. Fluid Layouts

Use relative units and flexible containers.

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 5vw, 3rem);
}

3. Responsive Images

<picture>
  <source media="(min-width: 1024px)" srcset="large.jpg">
  <source media="(min-width: 768px)" srcset="medium.jpg">
  <img src="small.jpg" alt="Description">
</picture>

Breakpoints

Testing Checklist

• Test on actual devices, not just browser resize
• Check touch targets (min 44x44px)
• Verify text readability at all sizes
• Test landscape and portrait orientations
• Check for horizontal scroll issues

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