What problem does it solve? Adopting Apple's iOS 26+ Liquid Glass design system correctly requires knowing which native APIs to use, how to order modifiers, when to group glass elements, and how to handle availability fallbacks. This Skill guides implementation and review of Liquid Glass UI so SwiftUI features follow Apple's design guidance and perform well. ## Core Features & Use Cases - Implementation Guidance: Apply glassEffect, GlassEffectContainer, glass button styles, and morphing transitions with correct modifier order and shapes. - Code Review Checklist: Verify availability gating with #available(iOS 26, *), container composition, interactivity flags, and transition identifiers. - Use Case: When adding a glass toolbar with multiple icon buttons, wrap them in a GlassEffectContainer, apply .glassEffect(.regular.interactive()) after layout modifiers, and provide an .ultraThinMaterial fallback for earlier iOS versions. ## Quick Start Use the swiftui-liquid-glass skill to implement a SwiftUI card with an interactive Liquid Glass effect and an iOS 25 fallback.