How to hide blog title in MT Dark?

Try:

#header h1 {
position:absolute;
top:-9000px;
left:-9000px;
}

That did hide the header, but also moved the page links up to the top, where they’re very hard to see.

Add

#nav {
margin-top:130px;
}

Awesome, that worked! Is there any way I can do that on the single blog post pages, archives, etc?