> What's the technological level? Modern, near future, or space-faring full-on science-fiction? A steampunk or cyberpunk variant? Are there spaceships, orbital weapons, guns, crossbows.... what?
> 
> Is the magic divided into particular schools, does it have particular limits, or can we just make up whatever we want?
> 
> You stated that the people adapted, and even evolved on both sides of the planet. Wouldn't that mean that there are two 'races'? Snow-people and sun-people?
> 
> Also, I like Three. Just, the fact that the cities are One and Three amuses me. I don't know why. It just does.

The technological level is near future, but not since the planet is at war, nothing has really been going on for spaceflight. I'd say the variant is definitely cyberpunk, and it's up to lazer guns.
The magic is pretty much whatever people come up with.
The people of the planet come in all different shapes, colors, and sizes. Yes, there would probably be some people who are more adapted to the heat and cold but the majority live in the belt region where there are no extremes, so they could look like anything.
I hope I answered your questions, feel free to ask more or give your opinion.