rikhil-33/CampusHub — reverse-engineered prompt

Build me a simple CampusHub student dashboard that brings common college tools into one clean place. I want students to be able to post academic doubts anonymously, see and upvote doubts from others, track attendance by subject with warnings when they’re at risk, view a timetable, browse a small marketplace for notes or books, list skills they can teach or want to learn, and check an inbox for recent updates.

Keep it as a responsive web dashboard that works by just opening an HTML file in the browser, with a clean light and dark mode toggle. Use plain HTML, CSS, and JavaScript, no complicated setup.

Also include a simple Java command line version that shows the core logic for doubts, notifications, and marketplace search or sorting. It should have a menu where I can post and view doubts, sell an item, search the market, sort items by price, and check the latest notification. Use basic custom data structures where it makes sense.