If the preview still shows the same message, do a hard refresh:

• Desktop: Cmd+Shift+R (Mac) or Ctrl+Shift+R (Windows)
• Or open the preview in a fresh tab/session

This clears any aborted Service Worker state in the preview environment so the app can initialize cleanly.

I've completely rewritten the app to be more stable and functional:

Key Changes:

1. Simplified theme system - Removed next-themes dependency and created a basic toggle that directly manages the dark class
2. Removed complex particle background - Replaced with simple CSS gradients and animations
3. Reduced Framer Motion usage - Only essential animations remain
4. Better error handling - All localStorage and DOM operations are wrapped in try-catch
5. Cleaner styling - Direct Tailwind classes instead of complex glassmorphism
6. Simplified counter animation - Custom implementation using requestAnimationFrame instead of Framer Motion

The app now has:

• ✅ Dark/light theme toggle that persists
• ✅ Responsive design with proper mobile layout
• ✅ Form validation with clear error messages
• ✅ Animated results with smooth transitions
• ✅ localStorage persistence for user settings
• ✅ All the calculation logic working correctly

Try entering some values and clicking Calculate - it should work smoothly now!