Pro-Bhupesh/BPCL_Standard_Drawings — reverse-engineered prompt

Build me a simple BPCL PMC reference library website for standard drawings. I want it to open in a browser and show the available drawings from the Std Drawings folder in a clean, easy to browse way, so someone on site can quickly find the drawing they need without digging through files.

Make the home page feel like a practical library, with a clear title, search box, simple categories if the files make that possible, and clickable items that open or download the drawings. It should work well on mobile and desktop, since people may use it from a phone or tablet. Please also make it installable like a basic web app using the existing icons and manifest, and keep offline support with the service worker so previously loaded content can still be accessed when internet is poor.

Keep the design professional and simple, suitable for a BPCL reference tool. If anything is unclear, inspect the existing files and use sensible defaults.