Need different selectors for excerpt and full post

to wrap its content, excerpt uses .entry-summary, full post uses .entry-content

I tried that, but unfortunately, .entry-summary doesn’t wrap the headline (date, posted by), and if I edit the headline’s width in its own selector, its width is also effected in .entry-content (which has a wider width than .entry-summary).

I finally managed to find the selector! And I will post it here, should someone need it:

.singular .post or .singular-post .post will select all posts appearing as individual post, and will override the CSS that comes from .post. The selector .post, however, will still apply to posts appearing on the page with all posts, just not singular posts.