Office UI Fabric Core

This package, `office-ui-fabric-core`, provides the foundational CSS styles, typography, icons, and grid system for implementing the Microsoft Office Design Language, now largely aligned with the Fluent Design System. It is the front-end framework for building user experiences for Office and Office 365, distinct from the React-based component library `office-ui-fabric-react`. The current stable version is 11.1.0, with minor releases and bug fixes occurring every few months. Its key differentiators include providing pre-built styles that ensure visual consistency with Microsoft's product suite and offering a mobile-first, responsive design approach. It is primarily consumed as a CSS stylesheet, either via CDN or package managers like npm, rather than through JavaScript module imports.