Mobile-first design starts with the smallest screen and works upward, rather than designing for desktop and shrinking down afterward.
Why the Order Matters
Designing for constraints first forces genuine prioritization of what matters most on a page — that discipline tends to produce cleaner results even on larger screens.
It Matches How People Actually Browse
With most web traffic coming from phones, designing for that reality first, rather than as an afterthought, better serves the majority of real visitors.
It Aligns With Google's Indexing
Since Google predominantly indexes the mobile version of your site, a mobile-first approach also directly supports SEO.
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