UnoCSS is an instant atomic CSS engine designed to be flexible and extensible. The core is un-opinionated - all CSS utilities are provided via presets. It's a superset of Tailwind CSS, so you can reuse your Tailwind knowledge for basic syntax usage. Important: Before writing UnoCSS code, agents should check for or files in the project root to understand what presets, rules, and shortcuts are available. If the project setup is unclear, avoid using attributify mode and other advanced features - stick to basic usage. The skill is based on UnoCSS 66.x, generated at 2026-01-28. Core | Topic | Desc…