Create a responsive 1-page portfolio built with HTML & CSS that showcases a fictional (or real) designer/developer. Use CSS Grid and Flexbox together to craft a clean, modern layout that works on mobile, tablet, and desktop. Focus on semantic markup, tidy CSS (use of variables is encouraged), accessibility, and a polished visual design. No external CSS frameworks (Bootstrap/Tailwind) — write your own CSS. Provide a live preview (CodePen / Netlify / GitHub Pages) plus a link to the source code.