This is a complete, single-file "Free Paver Patio Base Material & Sand Calculator" application. It uses Tailwind CSS for layout and styling, Lucide icons for visual polish, and clean vanilla JavaScript for the calculation engine. ```html
Accurately estimate crushed stone, sand, and pavers for your project.
Recommended for irregular cuts & spillage
Crushed Stone (Base)
0.00 Cubic Yards
Bedding Sand
0.00 Cubic Yards
Total Bags (0.5 cu ft ea)