Ksa-younes/youni — reverse-engineered prompt

Build me a clean, polished little website called Youni using what is already in this repo. I want it to feel modern, simple, and mobile friendly, with a nice landing page that actually looks finished instead of like a bare template. Please use the images or branding in the assets folder if they fit, and make the main page in index.html feel smooth and welcoming, with clear sections, good spacing, and buttons or links that make sense.

Since there is a manifest file, make it feel a bit like a lightweight web app too, so it can be added to a phone home screen and still feels nice on mobile. If anything is missing, just make sensible choices and keep it lightweight. I do not need anything overly complex, just something cohesive and ready to open in a browser right away. If you need ideas for best practices, feel free to check current docs online and then wire everything up end to end.