I\'ve just downloaded the new PHPStorm EAP, and noticed this screenshot:

And I like i
On Mac the title bar of every window (both main and popup dialoges) will remain the typical Mac grayish color, even using the Darcula theme. But you can actually make it dark as well.
Using any Jetbrain IDE (including DataGrip), press Shift + Ctrl + A (PC) or Shift + Cmd + A (Mac). This will open the command palette where you can find Registry:
Open the registry and find the key ide.mac.allowDarkDindowDecorations:
Enable this, close the registry and restart the IDE.