Hi Douglas,
To make menu fonts bolder, use this CSS code:
.main-navigation a {
font-weight: 600;
}
The font-weight can be any of the following numbers:
100
200
300
400
500
600
700
800
900
Normal
Bold
Bolder
Lighter
To change the color when you’re hovering over menu items, use this CSS code and change the 777777 color to your own:
.main-navigation a:hover {
opacity: 1;
color: #777777;
}
You can enter the above codes either in your child theme’s style.css or in Appearance > Customize > Additional CSS.
Let me know if there’s anything else I can do to help!