Mobile Store Invoice System – Cashier & Backend Dashboard (HTML/CSS/JS)

Developed a complete Invoice System for a Mobile Store using HTML, CSS, and JavaScript, designed to help store owners manage products and generate invoices smoothly. The system consists of two main pages: 1) Cashier Page Displays a list of available mobile products Allows adding new items to the invoice Supports increasing/decreasing quantities Supports deleting items from the invoice Automatically calculates the invoice total in real time Simple and fast interface built for daily use 2) Backend Page (Admin Page) Allows the store owner to add new mobile models Automatically syncs added products to appear in the cashier page Helps maintain an updated list of available phones Key Features Real-time invoice total calculation Clean UI for quick cashier work Fully dynamic without page reloads Organized product structure Error-free calculations