Some trouble with @media

Question

Hello wizards.
Solo will not show the hole problem, but I'll try to explain.
So, i try to learn adaptive design and have to experience certain difficulties. If i reduce browser window, then everything works fine. But when i check this with DevTools, and as you can see here, nothing works. On the extension up to 1000px width.
That is, if in the third media query the extension is less than 1000px, only it will work and when i decreasing page size (in DevTools) , content on the page just shrinks. ...
https:

Answer 1

... If min-width >= 1000px, then the third and second media queries works. I.e. if the extension becomes less than 600px (in my example), then the page just continues to shrink, but does not process the first media request.
What's wrong i do?

And I'm so sorry for my English. I'm really sorry.

Answer 2

https://code.sololearn.com/Wp2fijGCr0Nm/?ref=app