CSS files not being called

I love the look of Frisco and would love to use it on some sites, but for some reason, none of my CSS changes are having any effect (even really basic things, like hiding the search box, which work perfectly in Developer Tools). First, I checked custom.css in theme options and created and added to that file (placed in /wp-content/themes/frisco-for-buddypress/). When that didn’t work, I tried adding to style.css, then even to color.css, and selecting that color. None show any changes. (I’m not using a caching plugin, and I’ve cleared the browser cache.)

functions-custom.php works perfectly with my changes.

Any suggestions would be much appreciated. Thanks.