Dekstop and mobile menu for login, signup different. Follow same design as this page nav bar. By clicking login/signup on laptop this dropdown will show. In case for mobile 2nd image. Bell icon hidden when user not logged in. Same as before. Icon changed.
For design reference

You can also copy this design of menu, whichever is feasable. Remove contact us and add Help & support.

footer Can be same as website.
If logged in remove footer and use this below
background-image: linear-gradient(110deg,#000140 -10%,#4286ef 100%);

Copyright@{{current year}}