anishCS/Custom-Tshirt-Website ? reverse-engineered prompt

Build me a custom T shirt website where people can see a shirt in 3D and change how it looks in real time.

I want a clean landing page with a modern feel, a main 3D shirt preview, and simple controls for changing the shirt color and adding a logo or design. The experience should feel smooth and easy to use, like someone can play with different styles before deciding what they want.

Please make it responsive so it works well on desktop and mobile, and keep the design polished and minimal. If you need current docs or examples for the 3D setup, look them up online. Also make sure the code is organized so it would be easy to keep adding more customization options later.