Most e-commerce traffic is mobile. Optimize for mobile.
Layout changes:
- Full-width swipeable gallery
- Sticky add to cart button
- Collapsible sections for details
- Bottom sheet for variant selection
Touch targets:
- Minimum px tap targets
- Adequate spacing between options
Performance:
- Smaller images for mobile
- Prioritize above-fold content
- Reduce JavaScript payload
Testing: Test on real devices, not just browser emulation.