I'll create a modern e-commerce website using vanilla HTML, CSS, and JavaScript with clean, modern visuals. Here's a complete implementation:

This e-commerce website includes:

1. Modern Design Elements:

   • Clean, minimalist layout with ample white space
   • Responsive design that works on all devices
   • Subtle animations and hover effects
   • Modern typography and color scheme

2. Key Features:

   • Responsive navigation with mobile menu
   • Product filtering by category
   • Shopping cart functionality with add/remove items
   • Product grid with hover effects
   • Newsletter signup form
   • Category showcase section

3. Functionality:

   • Product filtering system
   • Fully functional shopping cart with quantity adjustment
   • Mobile-responsive navigation
   • Interactive elements with hover states
   • Form validation

The code is organized into three files:

• index.html: Structure and content
• styles.css: All styling with responsive breakpoints
• script.js: JavaScript for interactivity and cart functionality

You can extend this by adding more pages like product details, checkout, and user authentication. The structure is modular and easy to expand.