Shopify Theme Redesign Needed

I’m looking for a Shopify expert who can rebuild the visual style of my current store so it feels as polished and elegant as http://laiyanajewelry.de/en.

Scope
• Re-create a fresh, responsive homepage that mirrors the clean lines, typography, and whitespace balance of the reference site.
• Redesign the navigation and dropdown menu structure so it matches the same minimalist look and smooth hover effects.
• Keep all existing products, collections, and descriptions untouched—this assignment is purely about the theme’s design layer.
• I will supply every photo, icon, and logo you need, so no image sourcing is required on your side.

Technical notes
– Build on an OS 2.0–compatible theme (or convert my current one) so I can manage sections easily.
– Make sure the design scales perfectly on mobile and tablet.
– Preserve my current SEO settings, URLs, and app integrations.

When you reply, let me know:
1. A ball-park timeline from kickoff to launch.
2. Your total cost for this redesign.
3. A couple of live Shopify stores you’ve styled that show similar aesthetic finesse.

I’m ready to start as soon as I pick the right partner, and I’ll provide staging access immediately.