These appear to be controlled by the TextStyle [versionmodified]. Starting with this rendering which uses .. versionadded::

I'm looking for styling the "New in" paragraph and for separating the summary line below. Here it is in html:

and here is the source:

I have attached my stylesheet which overrides sphinx.rts, as well as an excerpt from the .stylelog.

[versionmodified]
base=DEFAULT_STYLE
font_color = #6ab0de
font_slant = ITALIC

Although I can see in the style log that it picks up [versionmodified]

StaticGroupedFlowables()   D:103 (\dev\astro\ASCOM Master Docs 2022\source\telescope.rst)   <versionmodified>

Nothing is applied. Sphinx is converting the .. versionadded:: to "New in version 3" OK, and that is appearing in the PDF. But it appears that the [versionmodified] style isn't being applied. I'm not seeing ITALIC or the color. Also in sphinx.rts it's styled

[versionmodified]
font_slant=ITALIC

and that's not being picked up either. I hope I haven't missed something silly. I need the color changes and that separation between the .. versionadded:: section and the following paragraph. Ideally I'd like the color to be applied only to the "New in" text like it is in the HTML. Can someone help me?

Telescope.Action.Legend.stylelog.txt
ascom.rts.txt
ascom.rtt.txt