Create a fully responsive modern e-commerce marketplace website called NexaCart Nepal, inspired by the professional layout and user experience of Daraz but using completely original branding, code, colors, icons, and design; use HTML5, Tailwind CSS, and Vanilla JavaScript with a clean white background, orange (#F97316) primary color, dark navy (#0F172A) secondary color, and blue (#2563EB) accent color; include a sticky header with logo, large search bar, login/register, wishlist, and cart, a hero image slider with promotional banners, a category grid for smartphones, laptops, fashion, home appliances, smart watches, computer accessories, gaming, beauty, grocery, sports, and electronics, a flash sale section with discount badges, old and new NPR prices, star ratings, and Add to Cart buttons, a responsive product grid with at least 12 demo products, hover animations, smooth scrolling, mobile-first optimization, search suggestions, cart sidebar demo, SEO-friendly structure, and fast-loading performance; add trust sections for fast delivery across Nepal, cash on delivery, secure online payment, easy returns, genuine products, and customer support, a large promotional banner saying “NexaCart Nepal – Next Generation Shopping”, and a professional footer with Help Center, Shipping Info, Returns, Order Tracking, About Us, Contact, Privacy Policy, Terms, social media icons, email support@nexacart.com, and Kathmandu, Nepal as the location; also generate Product Details, Shopping Cart, Checkout, Login/Register, Seller Registration, Order Tracking, and Admin Dashboard starter pages, and make the final result look like a premium real startup marketplace ready for investors, customers, and live deployment in Nepal.