Set constraints for responsiveness

I need the product page responsive constraints set for three breakpoints. Open the product page file, set constraints on the hero image to stay pinned left and scale, pin the CTA to the bottom-right of its container, make the specs panel stretch horizontally with min and max widths, and verify at 320px, 768px, and 1440px. Save as ProductPage-Responsive and hand off to Ramesh by Wednesday end of day.

Before I send this to Ramesh in engineering, make the responsiveness obvious: list which layers are pinned and which stretch at each breakpoint, call out any components that switch layout (column to row), and highlight elements that will break at narrow widths like multi-line captions or fixed-width icons. Flag anything that requires JS to behave correctly.

I adjusted constraints and the header seems okay at 1024px yet on 375px the nav wraps and the search disappears. I’m presenting to founders tomorrow and can’t tell if this is a constraint issue, an overflow text problem, or a missing responsive variant. Which diagnostic checks should I run in order, what quick fixes will preserve the visual hierarchy, and when is it safer to add a mobile variant instead of fiddling with constraints?

Across several launches engineers keep rebuilding constraints I left unset, which costs time and introduces subtle layout differences. What habit or checklist will stop me from leaving constraints undefined, and what small file-organization or naming convention makes it impossible to miss a layer that needs constraints before handoff?