What problem does it solve? Translating Apple's Human Interface Guidelines into browser-based web apps is error-prone: teams either copy native-only patterns that break on the web or ignore platform conventions entirely. This Skill provides 10 concrete rules for building responsive iOS-like and macOS-like interfaces with Remix UI and css() mixins. ## Core Features & Use Cases - Adaptive Layout Rules: Guidance for compact mobile flows versus persistent multi-pane desktop layouts, navigation by device class, and responsive density. - Interaction and Input Standards: Touch-first 44px targets, keyboard and pointer enhancements, and visible alternatives to gestures and hover-only controls. - Visual and Feedback Patterns: Semantic color tokens, reduced-motion support, readable typography, and explicit feedback for destructive actions. - Use Case: When designing a project dashboard that must feel polished on iPhone Safari and desktop browsers, apply these rules to choose bottom navigation on mobile, a persistent sidebar on desktop, and safe-area-aware fixed UI. ## Quick Start Review my Remix UI page layout against the Apple HIG web app guidelines and suggest responsive improvements for mobile and desktop.