Designing for large screens first often creates mobile afterthoughts: tiny taps, heavy images, and forms that feel exhausting on a phone.
Start with the thumb zone
Primary actions should be easy to reach. Navigation should stay simple. Content should breathe.
Respect bandwidth
Compress media and load only what is needed. A beautiful page that stalls on cellular is not beautiful in practice.
Test on real devices
Simulators help, but real phones reveal spacing, contrast, and keyboard issues faster than any mockup.
