AnjishnuSengupta/anjishnusengupta.in — reverse-engineered prompt

Build me a modern personal developer portfolio site that feels polished and a little futuristic. I want a strong landing section with an interactive 3D computer, smooth motion throughout the page, sections for about, experience, tech stack, projects, and contact, plus a starry animated background to make it feel immersive.

Please include small 3D floating tech visuals, a rotating Earth in the contact area, and a working contact form that sends messages by email using environment variables for the email setup. Make sure it looks great on mobile too, with lighter fallbacks if full 3D would be too heavy or unsupported.

Keep performance in mind so it loads fast and feels smooth, with lazy loading or other sensible optimizations. I want it ready to run locally and easy to deploy. If anything is unclear, follow the style of a clean, professional developer portfolio and look up current docs online if you need to.