Quin

Delete them through FTP.
Remove them from Database.

If you are still having problems, I’d suggest re-installing WP. Just make a backup first.
(though that is always my default, and may not be the best answer – will work though)

I’d say it’s a dark blue.

Anyway, in body, you have color as #999 (line 108).
That is the default (technically).

Your problem lies in some JQuery file (custom-css), which is changing your font colour.
I have no idea how your files are structured (I cannot even find that file), but you can add !important to line 108, before the semi-colon to overwrite.

color: #999 !important;

No, please, don’t. I have the horrible feeling you’ll post it all.

Check on line 101 of the CSS file. That is where the font family is set.

You need that font-family for other tags – namely H1, H2, H3, etc.

SO H1 on line 149 should have a new font-family if you want a new font for there (or anything with the class of “entry-title”).

Define title font.

This is done in the stylesheet (css).
Find whichever header, or element (probably H1 or H2), and add:
font-family: "Whatever Font You Want", sans-serif;

The sans-serif is just a default, contingency font. If it’s a serif font (with little ticks on the letters), then use serif.

Sans = Without
Serif = Ticks
Sans Serif = Without Ticks

Yea, Balint is right, but I will point out the uses of !important – too many can cause more problems.

For fully responsive design, the CSS should include ‘media screen’ and be coded correctly.

With !important, it is essentially writing, re-writing, and then over-writing (normal, reduced, remove-from-reduced).

There is some CSS animation on the a tags.

I’d used Developer Tools in Chrome to figure out what styling is being applied to your links.

Go for the reinstall.

Easiest thing to do is keep a copy of wp-config and XML of the database. You’ll lose themes and plugins (unless backed up), then it’s a simple matter of deleting the files/folders from the server and reuploading them, following the guide on wp-admin/install.php.

You save time by uploading wp-config with WP.