Why didn't Japan directly occupy Hawaii?

You seem to have forgotten the situation at that time; Most of the Japanese troops are in China (194 1 year should be the dominant stage of War of Resistance against Japanese Aggression). Where can it spare its troops to Hawaii? Even if there is, do you think Hawaii can't be won back by the strength of the United States (in other words, can Japan hold on? Besides, the United States imposed an embargo on Japan at that time, and the most important thing was the sea. Japan thinks it has hit the Pacific fleet of the United States, compared with Japan.

There is also the first floor. I remember that the United States tried to avoid getting involved in the war, even if Roosevelt wanted to go to war; Is it too expensive?