Broken in 49bc2364 by the use of @extend.
Here's what happened. There are two CSS rules that both apply to pool links:
* a:link { color: var(--link-color); }
* .pool-category-series a { color: var(--series-pool-color); }
These rules have equal specificity (0-1-1). This means the rule that is
defined last takes priority. This means the order in which CSS files are
included matters. 49bc2364 used the @extend directive in a rule for
popup menus, which required an @import, which changed the order of the
CSS files, which made the a:link rule suddenly take priority over the
series pool rule.
The proper fix would be to use Sass's new @use directive instead of
@import, but that requires the latest version of Sass, which requires
the latest version of Webpacker, which we can't upgrade to yet because
of breaking changes.
The real moral of the story is: our CSS is very fragile because of
specificity rules. It's very important that rules are defined in a
certain order, otherwise our CSS will break.
* https://sass-lang.com/documentation/at-rules/use
* https://developer.mozilla.org/en-US/docs/Web/CSS/Specificity
Standardize font sizes and heading tags (<h1>-<h6>) to be more
consistent across the site.
Changes:
* Introduce font size CSS variables and start replacing hardcoded font
sizes with standard sizes.
* Change header tags to use only one <h1> per page. One <h1> per page is
recommended for SEO purposes. Usually this is for the page title, like
in forum threads or wiki pages.
* Standardize on <h2> for section headers in sidebars and <h3> for
smaller subsection headers. Don't use <h4>-<h6>.
* In DText, make h1-h4 headers all the same size. Standard wiki style is
to ignore h1-h3 and start at h4.
* In DText, make h4-h6 the same size as the h1-h3 tags outside of DText.
* In the tag list, change the <h1> and <h2> tag category headers to <h3>.
* Make usernames in comments and forum posts smaller. Also change the
<h4> tag for the commenter name to <div class="author-name">.
* Make the tag list, paginator, and nav menu smaller on mobile.
* Change h1#app-name-header to a#app-name-header.
https://fontawesome.com/how-to-use/on-the-web/other-topics/performance
The default version of Font Awesome uses Javascript to replace <i> tags
with dynamically generated SVG elements. This adds a lot of weight to
the Javascript bundle (at least 1MB+), even when using subsetting to
load only the icons we actually use. The web font version is less
featureful than the JS version, but much lighter weight.
