not-rishi/CALG ? reverse-engineered prompt

Build me a simple SGPA calculator website that lets a student enter their subject marks or credits and instantly see their SGPA. I want it to feel clean, easy to use, and mobile friendly, with a simple form and a clear result area.

Please make the experience smooth, with basic validation so it doesn’t break if someone enters something wrong or leaves fields empty. If it helps, add a reset button and a small explanation of how the calculation works. Keep the design modern but not complicated, since this is just a straightforward calculator site.

Use the existing project setup and make sure it runs properly in the browser. If you need to check anything, look up the current docs online. Also make sure the site is polished enough to publish and share as a small utility page.