DGSConsulting/Break-Even-Analysis-Calculator — reverse-engineered prompt

Build me a clean, mobile friendly break even analysis calculator for solopreneurs and small teams.

I want someone to open it in a browser and immediately enter fixed costs, variable cost per unit, and selling price per unit. The results should update as they type and show break even units, break even revenue, contribution margin, and whether the business is profitable at different sales levels.

Please include a simple visual chart that makes the profit and loss zones easy to understand. Add sliders or easy controls so people can test what happens if they change pricing or costs. They should be able to save and compare a few different scenarios, then export the results as a professional looking PDF report and CSV file.

Keep it simple with no login and no backend. It should work from a single static site, be responsive on phones and desktops, and feel polished enough for a small business owner to actually use. Use plain JavaScript and look up current Chart.js or PDF export docs online if needed.