### Key Features Implemented: 1. **Responsive Sidebar**:
- Collapses to hamburger menu on mobile
- Smooth sliding animations
- Overlay backdrop

2. **Accordion Menu**:
- Only one submenu open at a time
- Persists state across page refreshes
- Animated arrows
3. **Dark/Light Mode**:
- Professional toggle switch
- Full theming support
- LocalStorage persistence

4. **Swipe Gestures**:
- Swipe right from edge to open
- Swipe left to close
- Configurable sensitivity

5. **Visual Enhancements**:
- Font Awesome icons
- Smooth transitions
- Active state highlighting
- Clean, modern design

### Implementation Notes:

1. **Dependencies**:
- jQuery (loaded from CDN)
- Font Awesome (loaded from CDN)

2. **Browser Support**:
- Works on all modern browsers
- IE11+ with polyfills

3. **Customization**:
- Change colors via CSS variables
- Adjust breakpoints in media queries
- Modify animation speeds

4. **Integration**:
- Add to your master page template
- Works with ASP.NET Web Forms
- Easy to adapt for MVC/Razor