Mobile-first design for Indian users

• Start at phone width. Every page should work at 390 pixels without sideways scrolling.
• Big tap targets and readable text without zooming.
• Light pages: compress images and avoid heavy scripts for slower connections.
• UPI-friendly checkout: on phones, open the UPI app directly instead of asking customers to scan a QR on the same screen.
• Dark mode support for comfortable night-time use.
• Test on real, inexpensive phones, not just the newest models.

UPIPayments is checked at phone width in light and dark themes before every release.