PiyushRajan2007/portfolio ? reverse-engineered prompt

Build me a premium personal portfolio website for Piyush Rajan, who is an AI Engineer and Full Stack Developer.

I want it to feel polished and modern, with a strong hero section, smooth scrolling, subtle animations, and an interactive Three.js style AI core effect that can fall back gracefully if canvas is not available. Show my GitHub activity, a snapshot of my LeetCode stats, and a featured projects section with filters. I also want accessible case study dialogs for projects, a responsive layout that works well on mobile, and support for reduced motion preferences.

Use my existing profile links for GitHub, LinkedIn, and LeetCode, and make sure the whole site feels like a premium portfolio that could be opened directly in the browser or run with Live Server. If you need current docs or best practices for any animation or library behavior, look them up online first.