Main menu drop-down positioning

I’m using the transparent header with some custom CSS that prevents the main logo from shrinking too much:

.header_scrolled, .logo, .logo a, .logo a img, #header_main .container {
	min-height: 100px !important;
}
#top .header-scrolled .main_menu {
	margin-top: 5px;
}

However, this seems to have thrown off the positioning of the sub-menus and the accent line that appears under active links on the main menu. I am wondering how I can accomplish two things:

* Move the accent line up, so that it is about 10px beneath the main menu font.
* Move the drop-down positioning up, so that it opens at the same position as the accent line (10px beneath the main menu item)

Site linked below.

Thanks!