# Kanban Board Implementation
I'll create a fully functional Kanban board with all the requested features in a single HTML file. The solution will include draggable cards, local storage persistence, and a vibrant design with Tailwind CSS.
```html
Vanilla Kanban Board
Kanban Board
Drag and drop cards between columns
Backlog0
In Progress0
Review0
Done0
Delete Card
Are you sure you want to delete this card? This action cannot be undone.
```
## Features Implemented
1. **Kanban Columns**: Backlog, In Progress, Review, and Done columns
2. **Card Functionality**:
- Draggable cards that can be moved between columns
- Editable in place (via title and content fields)
- Deletable with confirmation modal
- Add new cards to any column
3. **Persistence**:
- All state is saved to localStorage with a custom namespace
- State survives page reloads
4. **Design & UX**:
- Modern, vibrant design using Tailwind CSS
- Subtle CSS transitions and hover effects
- Confetti animation when cards move to "Done" column
- Responsive layout that works on different screen sizes
5. **Test Compliance**:
- All required data-testid attributes are present
- No window.alert or window.prompt used
- Enter key commits new cards
6. **Sample Data**:
- If no data exists, creates sample cards to demonstrate functionality
The application is fully self-contained in a single HTML file with no external dependencies beyond the CDN-hosted libraries.