Website UI/UX Overhaul

I already have the complete source code of my website, which was initially generated with AI.

I need an experienced web developer/UI-UX designer to professionally improve the existing website without changing its core functionality.

Main requirements:

* Make the website look professionally designed by a real human, not AI-generated.
* Improve the complete UI/UX and visual hierarchy.
* Create a clean, modern and trustworthy design.
* Improve typography, spacing, alignment, buttons, cards, forms and navigation.
* Make all pages visually consistent with the same design system.
* Improve header, footer, dashboard and other sections wherever required.
* Make the website fully responsive for mobile, tablet and desktop.
* Mobile UI is especially important because many users will access it from phones.
* Remove unnecessary/repetitive elements and improve the overall layout.
* Fix any visual bugs, overlapping elements or responsiveness issues.
* Improve loading performance where possible.
* Clean up the existing HTML/CSS/JS/code structure where required.
* Keep the existing features and functionality working properly.
* Do not unnecessarily rebuild the entire project from scratch.
* Make the final result look like a professionally developed commercial website.
* Use consistent colors, fonts, icons, borders, shadows and spacing.
* Add subtle professional animations/interactions only where they improve UX.
* Ensure forms, buttons, menus and dashboard elements work correctly.
* Check the website on different screen sizes and browsers.

Important:
I will provide the existing source code. Your job is primarily to improve the design, UI/UX, responsiveness and professional appearance while preserving the existing functionality.

Before starting, please review my source code and show me a few examples/screenshots of your previous UI/UX work.