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+# Apple UI Documentation Index
+
+## Quick Navigation
+
+### Liquid Glass Design
+- [Overview](liquid-glass/overview.md) - Core concepts, platform availability
+- [AppKit Implementation](liquid-glass/appkit.md) - NSGlassEffectView usage
+- [SwiftUI Implementation](liquid-glass/swiftui.md) - glassEffect() modifier
+- [Common Patterns](liquid-glass/patterns.md) - Reusable components & techniques
+
+### Toolbar Features  
+- [SwiftUI Toolbar Features](toolbar/swiftui-features.md) - Customization, search, transitions
+
+## API Quick Lookup
+
+### Liquid Glass APIs
+
+| Task | SwiftUI | AppKit |
+|------|---------|--------|
+| Apply glass | `.glassEffect()` | `NSGlassEffectView()` |
+| Set shape | `.glassEffect(in: .rect(cornerRadius: 16))` | `glass.cornerRadius = 16` |
+| Add tint | `.glassEffect(.regular.tint(.blue))` | `glass.tintColor = NSColor.blue` |
+| Make interactive | `.glassEffect(.regular.interactive())` | Custom mouse tracking |
+| Container | `GlassEffectContainer { }` | `NSGlassEffectContainerView()` |
+| Button style | `.buttonStyle(.glass)` | Custom GlassButton class |
+| Morphing | `.glassEffectID("id", in: namespace)` | Manual animation |
+
+### Toolbar APIs
+
+| Task | SwiftUI Code |
+|------|--------------|
+| Customizable toolbar | `.toolbar(id: "main") { }` |
+| Add item | `ToolbarItem(id: "save") { }` |
+| Add spacer | `ToolbarSpacer(.flexible)` |
+| Minimize search | `.searchToolbarBehavior(.minimize)` |
+| Reposition system item | `DefaultToolbarItem(kind: .search, placement: .bottomBar)` |
+| Transition source | `.matchedTransitionSource(id: "btn", in: namespace)` |
+
+## Decision Trees
+
+### When to Use Liquid Glass
+
+```
+Need glass effect?
+├─ Single view → .glassEffect() / NSGlassEffectView
+└─ Multiple views
+   ├─ Need merging → Use Container
+   └─ Independent → Individual glass effects
+```
+
+### Choosing Framework
+
+```
+Platform target?
+├─ iOS only → SwiftUI
+├─ macOS only
+│  ├─ Need AppKit integration → NSGlassEffectView
+│  └─ Pure SwiftUI app → .glassEffect()
+└─ Cross-platform → SwiftUI with platform checks
+```
+
+## Performance Guidelines
+
+| Scenario | Recommendation | Max Count |
+|----------|---------------|-----------|
+| Static UI | Individual glass effects | 5-10 |
+| Dynamic lists | Container + lazy loading | 20-30 |
+| Animations | Disable during transitions | N/A |
+| Scrolling | Disable glass when scrolling | N/A |
+
+## Common Tasks
+
+### Create Glass Button
+- **SwiftUI**: `Button("Click").buttonStyle(.glass)`
+- **AppKit**: See [Glass Button Pattern](liquid-glass/patterns.md#glass-button)
+
+### Animate Glass Tint
+- **SwiftUI**: `.glassEffect(.regular.tint(condition ? .blue : .clear))`
+- **AppKit**: `NSAnimationContext` with `animator().tintColor`
+
+### Merge Glass Effects
+- **SwiftUI**: Wrap in `GlassEffectContainer(spacing: 40)`
+- **AppKit**: Use `NSGlassEffectContainerView` with spacing
+
+### Custom Toolbar
+- **SwiftUI**: `.toolbar(id: "main")` with `ToolbarItem(id: "item")`
+
+## Platform Requirements
+
+| Feature | iOS/iPadOS | macOS | visionOS |
+|---------|------------|-------|----------|
+| Liquid Glass | 17.0+ | 14.0+ | 1.0+ |
+| Customizable Toolbars | 17.0+ | 14.0+ | N/A |
+| Glass Button Style | 17.0+ | 14.0+ | 1.0+ |
+| Matched Transitions | 17.0+ | 14.0+ | 1.0+ |
+
+## Migration Guide
+
+### AppKit → SwiftUI
+```swift
+// AppKit
+let glass = NSGlassEffectView()
+glass.cornerRadius = 16
+glass.tintColor = NSColor.blue
+
+// SwiftUI equivalent
+View()
+    .glassEffect(.regular.tint(.blue), in: .rect(cornerRadius: 16))
+```
+
+### Old Toolbar → New Toolbar
+```swift
+// Old
+.toolbar {
+    Button("Save") { }
+}
+
+// New (customizable)
+.toolbar(id: "main") {
+    ToolbarItem(id: "save") {
+        Button("Save") { }
+    }
+}
+```
+
+## Resources
+
+### Apple Documentation
+- [NSGlassEffectView](https://developer.apple.com/documentation/AppKit/NSGlassEffectView)
+- [View.glassEffect](https://developer.apple.com/documentation/SwiftUI/View/glassEffect)
+- [CustomizableToolbarContent](https://developer.apple.com/documentation/SwiftUI/CustomizableToolbarContent)
+
+### Sample Projects
+- [Landmarks: Liquid Glass](https://developer.apple.com/documentation/SwiftUI/Landmarks-Building-an-app-with-Liquid-Glass)
+
+### WWDC Sessions
+- Liquid Glass design principles
+- Toolbar customization in SwiftUI
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