nosibbiswas22/expenzo ? reverse-engineered prompt

Build me a simple expense tracker web app called Expenzo.

I want a clean page where I can add an expense with a name, amount, and category, then see it show up in a list right away. It should also show my total spending at the top, and maybe break things down a little so it’s easy to see where the money is going. Make it feel polished and easy to use on desktop and mobile.

Please keep it lightweight and make the UI nice with a modern look. Use the existing HTML, CSS, and JavaScript setup in this project, and wire everything together so it works as a single page app. If you need to look up current best practices or examples online, go ahead.