LynnFernandes23/Inventory-Mangement-System- — reverse-engineered prompt

Build me a simple inventory management website in PHP with a SQL database. I want a home page, login and registration, and then separate areas for inventory, customers, sales, orders, pending orders, and shipments. Each section should let someone view records and add, edit, or update them in a straightforward way. There should also be a basic contact us page and logout.

Please make the pages feel clean, responsive, and easy to move around, with clear navigation between the inventory, sales, customer, and shipment sections. Add helpful client side validation and small interactive touches where they make the experience smoother, but keep it simple and practical. I want the main flows to actually work with the database, not just be mock screens.

If anything is unclear, use the existing project structure and look up current docs online if you need to. Keep it easy for me to run locally and test.