IvanRubert/IvanRubert.github.io ? reverse-engineered prompt

Build me a simple personal website for my GitHub Pages, with a clean homepage that feels like an online CV and portfolio. It should have a nice landing page with my name, a short intro, links to my work, and a way to open my CV or resume. I also want a dedicated CV page, a maintenance page for when the site is being updated, and a custom 404 page that matches the rest of the site.

Keep it lightweight, responsive, and easy to edit later. Use a straightforward visual style, with separate CSS and JS files if needed, and make sure the whole thing works well as a static site. If you need to check anything current, look up the best practices for GitHub Pages and simple personal portfolio sites online.