I would recommend Capacitor JS for mobile, responsive CSS (or CSS utility libs such as PrimeCSS, PrimeFlex, or tailwind), and any JS state based library (React,

I would recommend Capacitor JS for mobile, responsive CSS (or CSS utility libs such as PrimeCSS, PrimeFlex, or tailwind), and any JS state based library (React, Preact, etc). Many people underestimate the power of webview based tech in mobile. For most usecases, webview based tech does just fine.