I agree with the sentiment of mobile first, its a good philosophy to follow. However, I've never seen the need to use min-width with desktop styles over max-width with mobile styles. At the end of the day, they accomplish the same thing and are almost identical, albeit a mirrored version of each other. As long as you keep your html structured in a way that will be possible to style for both, I think you're good.
However, I definitely wouldn't mix and match, especially not in the same stylesheet. That's just a headache waiting to happen.
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I agree with the sentiment of mobile first, its a good philosophy to follow. However, I've never seen the need to use min-width with desktop styles over max-width with mobile styles. At the end of the day, they accomplish the same thing and are almost identical, albeit a mirrored version of each other. As long as you keep your html structured in a way that will be possible to style for both, I think you're good.
However, I definitely wouldn't mix and match, especially not in the same stylesheet. That's just a headache waiting to happen.