How to achieve this accordion design from Reflex documentation page?

[o12486vs2]

Hi everyone,
I noticed this sidebar navigation design on the Reflex documentation page (see attached screenshot). It has some nice features like:

A purple/violet indicator bar on the left of the selected item ("Accordion")
Hierarchical structure with expandable categories ("Disclosure", "Dynamic Rendering")
Clean dark theme with proper spacing and colors

I've been trying to recreate this using rx.accordion, but I can't seem to achieve this exact design.
My questions:

Is this actually built with rx.accordion component?
If so, how can I style it to get that left indicator bar and selected state?
Are there any custom styles or specific props I should be using?

Any guidance or example code would be really appreciated!
Thanks!