snehadasgupta1675-bit/cognevance_personalPortfolio ? reverse-engineered prompt

Build me a responsive personal portfolio website that feels polished and modern, for a developer portfolio. It should have a clean home experience with sections for About, Skills, Projects, and Contact, and smooth navigation between them. Make the site work nicely on desktop and mobile, with a simple layout and good spacing.

I also want the contact form to actually submit messages to a backend, store them in MongoDB, and show a helpful success or error message after submission. Use a React front end with route based navigation, and a Node and Express backend for the form handling. Keep the styling professional and simple, and make sure the whole thing feels like a real portfolio someone could use to present their work. If you need to look up current docs online for anything, go ahead and do that.