askvortsov Something like this might be enough to help distinguish.
The All Discussion page adds notification of new posts to the right of each discussion, so I expect that is where people would most likely look for new discussions posted in a category. This might call for a different icon. Not sure. Then, to help that bar stand out, you could simply adjust the
box-shadow to darken it and lift it from the page a bit. Optionally, you could add an inset
box-shadow with a border of the same color as the bar to set it apart a bit more – might make it too busy, though.
Could possibly add the word New or Unread under the icon and number to better define what that means.