Have black screen right on the game start. Nothing is visible except link to the site and version info at the bottom. Alt+F4 works.
I suppose this can happen due to my network configuration: main connection is port restricted. But adding “corporate game VPN” with most of the ports opened or Bluetooth tethered connection from phone (all ports are opened) usually solves problems.
The data of your game has been corrupted. I suggest you re-install the game and/or let Steam verify the game’s integrity (Properties -> Local Files -> Verify Integrity of Game Cache).