[NTG-context] How to reproduce a particular head/title style

[Garulfo]

Hi,

I would like to learn "how to ConTeXt" complex titles styles like the one seen in the following document:

• https://wiki.contextgarden.net/images/f/f1/Screenshot_20201103_220818.png
• original document: https://www.hautconseilclimat.fr/wp-content/uploads/2020/10/hcc_rapport_maitriser-lempreinte-carbone-de-la-france-1.pdf

Please, what would be a preferred way ?

• overlay ?
  
• \setuphead with before/after ?
  
• \setupfloat[bleedfigure] and \placebleedfigure{}{\blackrule}

I try to describe the specification here :

• doublesided document
• on both side, section title are underlined by a red rule, always "left aligned" in the text area, shifted to the right by the same distance than it is done for the text of the title, which ends at the right border of the page
  
• on the left page : section title are overlined by a "second red rule", which starts "left aligned" in the text area, and goes across the whole page width
• on the right page : the "second red rule" starts from the left border of the page, and terminates at the end of the text area

Last detail (very nice, but can be forgotten because I suppose it will involve more complex stuff) : the "second red rule" from the left page... it continues a little bit on the right page.

Thanks a lot for any help !

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