Finalize ChatGPT-Style Web UI

I already have a working web front-end in PHP/HTML/CSS/JavaScript and a fully functional inference endpoint (it is ​not​ OpenAI, but it returns JSON in the same structure). Most of the heavy lifting is done; what’s left is the last layer of polish so the interface truly feels like ChatGPT... (Budget: €8 - €30 EUR, Jobs: CSS, Frontend Development, HTML, JavaScript, PHP, UI / User Interface, User Interface / IA, Web Development)