Vovy opens your site in Chrome's device mode, finds what overflows or overlaps on small screens, and fixes the layout for every phone size.
My site looks fine on desktop but it's broken on my phone
It is close for layout. Test once on a real iPhone too, since Safari handles some things, like the address bar height, differently.
Safari zooms when an input's font is smaller than 16px. Setting inputs to 16px stops it.
No. Mobile fixes go inside small-screen breakpoints so desktop stays as it is.