get_theme_mod Not Functioning Properly

I think the problem is simply this line:

'type' => 'option', 

You should remove it, because the default is:

'type' => 'theme_mod', 

since you want to use get_theme_mod().

You should also consider:

• prefixing these color settings slugs, to make them more unique.
• using for example: 'sanitize_callback' => 'sanitize_hex_color', in your settings setup for sanitazion.

ps: there’s some piece missing from your code snippet.

Edit by Otto: The above answer is correct. Additionally:

• When you do get_theme_mod('primary_color'), you should also specify the default value there, like so: get_theme_mod('primary_color', '#88C34B'). This will prevent it from outputting broken CSS when the user has not selected a color in the customizer yet.

• Prefixing the slugs is not actually necessary for theme-mod settings, because they are stored uniquely to the theme in any case. If you were using options and not theme-mods, then prefixing would be desirable.