gazijarin/Portfolio.js ? reverse-engineered prompt

Build me a small JavaScript portfolio tool I can drop into a website with a few script tags and one stylesheet. I want it to handle the main parts of a personal portfolio page, like an about section, work experience, and project items, and make it easy to render those sections from simple data files. Please also include a clean demo page and a basic public endpoint or docs page that shows how to use it, since I’ll want to plug it into an existing site quickly.

Make it simple for someone like me to add the scripts, load the styles, and see the portfolio content appear without needing a lot of setup. If anything depends on current browser or library details, look up the current docs online if you need to. I care most about having a polished, ready to use portfolio experience that feels straightforward and works out of the box.