The h2/h3/h4 tags (being innermost) overrode the foreground colors which were meant to be paired with background color settings. So when I needed to use a "cc-widget-subtitle" h3, it ended up with dark text against a dark background, rather than the intended light text. But I confess that I just eyeballed the results of the change to look for issues against the design images rather than seeing what precisely they were. I'll collect the details now.