```
This is a complete, production-ready Todo App with:
✨ **Features:**
- Add todos (Enter key or Add button)
- Mark complete/incomplete with checkboxes
- Delete todos (hover to reveal × button)
- Persistent storage (localStorage)
- Real-time stats (total + completed)
- Beautiful animations and hover effects
- Empty state with illustration
- Responsive design (mobile-friendly)
- Input validation and auto-resize
- Smooth slide-in animations for new todos
🎨 **Design:**
- Modern gradient design
- Glassmorphism shadows
- Smooth transitions
- Dark/light theme ready
- Professional typography
⚡ **Performance:**
- Efficient DOM updates
- RequestAnimationFrame for smooth animations
- Minimal re-renders
Just save as `todo-app.html` and open in any browser. Fully self-contained - no dependencies!