I need a secure, role-based admin portal added to my jewellery e-commerce site. Only Admins and Managers will be allowed in, and a classic username-and-password login is fine as long as passwords are hashed and the session handling is solid. Inside the dashboard the first job is theme control: I already have three responsive templates—Luxury Gold, Minimal Diamond, and Modern Silver. The portal must let an authorised user preview any of these, switch instantly, and roll back if needed, all without touching code. Next comes analytics. I want clear, filterable charts that focus first on sales by phase, with an additional view for product-category figures. Data should load fast and export cleanly to CSV. Coupons are part of every sales phase and category: the system should auto-generate a 25 % discount code, attach it at checkout, and store redemption stats so we can see exactly where it was used. Finally, build a default email module that triggers order updates, coupon mail-outs, and general notifications; branded templates matching the active site theme will keep everything on-message. Deliverables • Secure login module (username/password, hashed, CSRF protected) with Admin + Manager roles • Theme selector for Luxury Gold, Minimal Diamond, Modern Silver (preview, apply, rollback) • Analytics dashboard: sales by phase (priority) and by product category with CSV export • 25 % coupon generator tied to phase and category, usage tracking included • Email system for order updates, coupon delivery, and general notifications using theme-matched templates • Deployment notes and a quick admin guide so I can maintain it myself