scss-patterns

Development

SCSS architecture and CSS variable policies. Use when writing SCSS stylesheets, CSS custom properties, or design system tokens. Do NOT use for plain CSS without SCSS or for CSS-in-JS solutions (styled-components, Emotion).

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Source SKILL.md: https://github.com/majiayu000/claude-skill-registry/blob/HEAD/skills/design/scss-patterns/SKILL.md

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SCSS Patterns

Module System Policy

Always use @use - @import is deprecated, causes duplicate CSS
Use @forward for public API exposure in index files
Namespace imports - @use 'colors' as c not bare @use 'colors'

CSS Variable Naming Policy

Pattern: --{prefix}-{property}[-{state}][-{variant}]

Example	Structure
`--btn-background`	prefix + property
`--btn-background-hover`	+ state
`--btn-background-hover-primary`	+ variant

Project-specific conventions (color palette structure, prefixes) belong in project's CLAUDE.md.

Selector Policy

BEM naming - Block__Element--Modifier
Max 3 levels nesting - flatten if deeper
Single class selectors - avoid .parent .child .grandchild
Use & for BEM - &__element, &--modifier

Loop Policy

Use @each for variants - sizes, colors, breakpoints
Use maps for configuration - not scattered variables

Anti-Patterns

Avoid	Why	Fix
`@import`	Deprecated, duplicate CSS	Use `@use`
Magic numbers (`13px`)	Unmaintainable	Use variables
Deep nesting (> 3 levels)	Specificity wars	Flatten with BEM
`!important`	Specificity problem	Refactor selectors
Hardcoded colors	Breaks theming	Use CSS/SCSS variables
Bare `@use` without namespace	Name collisions	Always use `as` alias