What problem does it solve? Designing interfaces that genuinely follow Apple's Human Interface Guidelines requires memorizing hundreds of specifications—type scales, color tokens, touch targets, safe areas, and platform conventions. This Skill encodes those rules so generated UI code is HIG-compliant by default across iOS, iPadOS, macOS, watchOS, tvOS, and visionOS. ## Core Features & Use Cases - Design system tokens: Provides San Francisco typography scales, light/dark system colors, 8pt spacing grid, and concentric border-radius rules as ready-to-use CSS custom properties. - Component and pattern guidance: Covers buttons, navigation bars, tab bars, sheets, alerts, segmented controls, toggles, plus UX patterns like onboarding, settings, and error handling via detailed reference files. - Platform-specific design: Includes guidance for visionOS spatial UI, watchOS complications, tvOS focus navigation, macOS menu bars, and Liquid Glass (iOS 26+) materials. - Use Case: Ask for an iPhone settings screen and receive complete HTML/CSS with dark mode support, 44pt touch targets, Dynamic Type-friendly layouts, and ARIA labels. ## Quick Start Ask the assistant to design an Apple-style settings screen for iOS with dark mode support and SF Symbols icons.