Suppose you're playing solo and a card has a decrease production of a resource (not mega credits though) with a red border. If you're production of that resource is at zero can you still play the card by assuming that you decreased someone else's production? I know that if the decrease production requirement is aimed at you, then you cannot play the card without having sufficient production to be decreased, but the red border situation is throwing me a bit.
Yes you can play the cards see rule 4 of the solo variant.
4) You have a neutral opponent that you can steal from, or
reduce any kind of resources and production from.
Whenever you have a card with a red bordered icon telling you to remove resources/production you target this neutral player.