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Building a Design Token System with CSS Custom Properties and Tailwind v4

Hardcoded colors feel fine when you're building for yourself. The moment someone else installs your library, they become a problem — every component locked to your brand's blue, with no clean way to change it. CSS custom properties fix this at the root. Set them up once and every component in the library becomes themeable for free.

CSS Cascade Layers: The Feature That Finally Fixes Specificity Wars

Specificity conflicts with third-party CSS, utility classes, and component styles are one of the most frustrating parts of scaling a CSS codebase. @layer doesn't just help — it fundamentally changes how the cascade works. Here's the mental model and the setup that makes it click.