```
---
## ✅ Testing Checklist
### Visual Testing
- [ ] Test at 375px (iPhone)
- [ ] Test at 768px (iPad)
- [ ] Test at 1024px (Laptop)
- [ ] Test at 1920px (Desktop)
- [ ] No horizontal scrolling
- [ ] All text is readable
- [ ] Images scale properly
- [ ] No overlapping elements
### Interaction Testing
- [ ] All buttons are tappable (44x44px min)
- [ ] Forms work on mobile
- [ ] Dropdowns don't overflow
- [ ] Modals fit on screen
- [ ] Navigation menu works
- [ ] Links are easy to tap
### Accessibility Testing
- [ ] Tab through all interactive elements
- [ ] Escape closes menus/modals
- [ ] Focus indicators visible
- [ ] Screen reader announces changes
- [ ] Color contrast meets WCAG AA
- [ ] Text can be zoomed to 200%
---
## 🚫 Common Mistakes to Avoid
### ❌ Don't Use Fixed Widths
```typescript
// Bad
// Good
```
### ❌ Don't Forget Mobile-First
```typescript
// Bad - Desktop first
// Good - Mobile first
```
### ❌ Don't Use Absolute Positioning Without Responsive Adjustments
```typescript
// Bad
// Good
```
### ❌ Don't Forget Touch Targets
```typescript
// Bad