What is the mental shift in utility-first CSS?
From 'what should I name this and what CSS does it need' to 'what utilities describe this element'. Once you make that shift, styling becomes faster and more direct because you reuse a fixed vocabulary everywhere.
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It means composing UIs from small, single-purpose utility classes like flex, p-4, and text-center, instead of writing named CSS classes and rules. Each utility does one thing, and you combine them in the markup.
The naming problem. In traditional CSS, you invent class names like card-inner-wrapper, which is hard and subjective. Utility-first removes this entirely: the utilities are fixed, and you compose them, so there is nothing to name.
Because utilities live in the markup, so styling is right where the element is. You do not switch between a CSS file and the markup to understand or change styling, which is faster and more direct.
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