The documentations dark-mode background color as
added in #23417 was perceived to be too purple-y [1]
and is therefore replaced by a desaturated black
that is derived from the systemd brand-black using
12% less HSL saturation.
[1] https://github.com/systemd/systemd/pull/23417#issuecomment-1146323820
Let the table span more than the default content width,
if the table contains alot of data (controlled by width: auto)
(720px is very good for continuous text, but too narrow for tables).
The container class is therefore adapted to put the
width restriction on the elements itself, allowing for
exceptions for individual elements like <table> and
<h1> (which used an offset margin before and is now
streamlined to use a max-width as well).
Also add a striped background to ease reading rows
and allow for horizontal mobile scrolling without
overflowing the entire document, only the table itself.
* Use brand-green for demo log messages on the startpage
instead of the default `green` color defined by the browser vendor
(after all, the brand green color is intended to reflect the
boot status output)
* Add a matching blue intro color (mixed using HSL from brand-green
by 55deg hue rotation and 4% lightness)
* Use a defined font-size
(to avoid blurry rendering at 13.33333px, due to font-size: smaller)
* Add possibility for the browser to show horizontal scrollbar
(avoid overflow in mobile view)
Respect the user agent property `prefers-color-scheme` by
rendering the documentation in dark mode, if requested.
Reorganise CSS to store the color palette into CSS variables
and reference these from another set of CSS variables that
are dynamically switched based on the prefers-color-scheme
media query.
Light mode variables stay they same as before,
but to ease color mixing, the current RGB values
have been transformed to HSL (using chrome devtools).
The current body background is now --sd-gray-extralight,
the current body color is now --sd-gray-extradark.
Other gray-variations, needed for dark-mode constrasts
are derived from these colors using HSL lightness shifting.
The systemd brand black color is used as dark mode background
and a matching extralight gray font color has been selected.
The link font-weight is reduced to 400 in dark mode,
as the green color on dark ground becomes to overwhelming
with a bold font.
The systemd logo color is dynamically swapped by using
the special fill value `currentColor` for dark/light-mode
depending parts – as per specification on brand.systemd.io
* Update to rougify 3.26.1 styling
* Adapt background overwrite by removing default background color
and only adding explicit overwrites for syntax error
(error stylings appear for example in json-excerpts –
see HACKING.md – and are therefore hidden by our css)
h1 font weight is defined to be 100 but no font-face
definition for weight 100 is included.
The browser will use the nearest available font-weight
instead. As that is 400, we do specify it explicitly now.
Those were added in b41a3f66c9 without
an explicit license, so they are under the default license. Some files
already got a header previously, so this only touches the remaining.
The same should be done for docs/_data/extra_pages.json, but it's json, and
json doesn't allow comments.
