Samarth2024/Excel-clone ? reverse-engineered prompt

Build me a web based Excel clone that works in the browser using plain JavaScript, HTML, and CSS.

I want a spreadsheet style interface with a big grid, column letters, row numbers, and multiple sheets that I can switch between. Cells should be editable, and I should be able to type numbers, text, and formulas like basic math and references to other cells. Make the formulas actually update when the linked cells change, and handle dependencies properly so changes flow through the sheet. Use a clean, simple layout that feels like a lightweight spreadsheet app, with enough polish that it is easy to use.

If you need to check current browser behavior or formula handling details, look up whatever you need online. Keep it self contained and working in one pass as much as possible.