Shopify Theme Customization & Website Refinements

I'm looking for a Shopify expert who can help me with extensive theme customizations and various website changes.

Key Tasks:
- Customizing the layout and design of my Shopify store
- Tweaking navigation and menus for optimal user experience
- Modifying typography and colors to align with my brand

Furthermore, there are several website changes that need to be implemented, including:
- Customizing CSS
- Changing the display of menu items
- Implementing responsive design elements

The ideal freelancer for this project should have:
- Extensive experience with Shopify theme customization
- Proficiency in CSS and responsive design
- Strong attention to detail and ability to translate design concepts into a functional website.