My @media queries aren't working on mobile devices
This is likely because you don't have a viewport set.
Place the following meta tag in the <head> element of your document.
<meta name="viewport" content="width=device-width, initial-scale=1">
For more information, read "Using the viewport meta tag to control layout on mobile browsers " - (mdn)
You can use (max-device-width:1080px) instead. It passes viewport and applys on device width.