CSS architecture, styling approaches, and responsive design. Use when working with styles.
Scanned 9/12/2026
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---
name: css
description: CSS architecture, styling approaches, and responsive design. Use when working with styles.
---
## css
Organize maintainable CSS.
### Approaches
- BEM: Block__Element--Modifier
- CSS Modules: locally scoped
- Tailwind: utility-first
- CSS-in-JS: styled-components
- CSS custom properties for theming
### Responsive design
- Mobile-first approach
- Breakpoints: sm(640), md(768), lg(1024), xl(1280)
- Relative units (rem, em, %) over px
- Flexbox and Grid
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