KrupPatel31/Level-Shift ? reverse-engineered prompt

Build me a clean, modern JavaScript web app called Level Shift.

I want it to feel like a finished product, with a polished landing page, a few interactive sections, and a smooth responsive layout that works well on desktop and mobile. Keep the design simple but sharp, with clear spacing, good typography, and a nice visual style that makes the app feel professional.

Make the main experience easy to understand right away, with obvious calls to action and sections that guide the user through the app. If you need to, look up current docs online so the implementation is up to date. Please wire everything into the existing project so it runs cleanly and looks cohesive from the start.