Premium Google Sheets Wedding Planner (Etsy Bestseller Style)

I need an advanced Google Sheets expert to build the "ultimate wedding planning system" for the etsy market. I am looking for a reliable partner to build a high-quality product.

Design & UX Requirements (CRITICAL):
* Style: Luxury, premium, "app-like" feel. NO standard gridlines.
* Colors: Deep, elegant tones (Emerald Green, Navy Blue, or Charcoal) with Gold/Champagne accents. Data input areas must be light/clean for readability.
* Navigation: Top fixed menu with clickable buttons (hyperlinks) to navigate between all tabs.

Technical Scope (14 Tabs):
1. Start Here: Instructions & setup (wedding date, currency).
2. Dashboard: Live countdown, budget progress bar, RSVP visual charts.
3. Budget Planner: Targets, actuals, emergency fund, and hidden costs (tips, taxes).
4. Guest List & RSVP: Contacts, diets, RSVP status synced to dashboard.
5. Seating Chart: Table assignments with capacity counters.
6. Timeline & Vendors: Interactive checklists (strikethrough when checked) & vendor comparison matrix.
7. Mood Board: Aesthetics, colors, Pinterest/dress links.
8. Website & Registry: Links hub for wedding site and registries.
9. Gift Tracker: Who gave what, value, "Thank You card sent" checkbox.
10. Photo Checklist: Checkboxes for mandatory shots (First kiss, rings).
11. Honeymoon Planner: Travel budget, flights, hotel, packing list.
12. Self-Care Tracker: Bride's daily mood, water, sleep, exercise.
13. Love Story: Text areas for "How we met", proposal, memories.
14. Anniversary Planner: Future goals, travel, baby plans.

Deliverables:
Bug-free master Google Sheet with protected formulas so buyers don't break them.