C1idiom
Can't see the forest for the trees
나무만 보고 숲을 보지 못하다 (세부사항에 빠져 전체를 못 봄)
To be so focused on small details that you miss the bigger picture.
예문
You're worrying too much about commas — you can't see the forest for the trees.
Step back. You can't see the forest for the trees.