One LaTeX design for a company, in three templates

A company that writes with LaTeX ends up with a document class, a letter class
and a presentation theme that share a design and not a line of code. Every fix
is then made three times, two of them late and the third never.

Here the page is written once. A company declares its colours, faces and logo in
one file, and the document template, the letter class and the presentation theme
read that one file. Nothing in the suite carries a colour value, a font name or
a file name of any company, which is what lets it be published while the
companies stay private.

Every measure of the page follows from a measurement or from a named definition:
the room the head and the foot need is taken from the boxes they really build,
one line of the body text stands between the head and the text and between the
text and the foot, a heading never stands alone at the foot of a page, a picture
takes the size of the family, and a Markdown file reaches the same page as the
same document written in LaTeX.

The suite ships with a company that does not exist, Nordwind AG, so that it
builds and is measured anywhere: three colours, the TeX Gyre families every
installation carries, and an icon drawn in TikZ.

574 checks over five measurements, all of them on the rendered page or on the
build log rather than on the source.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

examples/letter.tex

@@ -0,0 +1,39 @@
+\documentclass[english]{business-brief}
+\usepackage[plain]{nordwind}
+
+\NameZeileA{Nordwind AG}
+\NameZeileB{Hafenstrasse 4}
+\NameZeileC{CH~--~8000 Zurich}
+\RetourAdresse{Nordwind~AG~-~Hafenstrasse~4~-~8000~Zurich}
+\InternetZeileA{https://nordwind.example}
+\InternetZeileB{post@nordwind.example}
+\BankZeileA{CH00 0000 0000 0000 0000 0}
+
+\Datum{21 September 2026}
+\Adresse{Ms\\Erika Muster\\Beispielweg 7\\8001 Zurich}
+\Betreff{Lorem ipsum dolor sit amet}
+\Anrede{Dear Ms Muster}
+\Gruss{Yours sincerely}{2em}
+\Unterschrift{Hans Beispiel\\Managing Director}
+
+\begin{document}
+\begin{g-brief}
+
+Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum.
+
+Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio dignissim qui blandit praesent luptatum.
+
+Nam liber tempor cum soluta nobis eleifend option congue nihil imperdiet doming id quod mazim placerat facer possim assum. Typi non habent claritatem insitam; est usus legentis in iis qui facit eorum claritatem. Investigationes demonstraverunt lectores legere me lius quod ii legunt saepius.
+
+Claritas est etiam processus dynamicus, qui sequitur mutationem consuetudium lectorum. Mirum est notare quam littera gothica, quam nunc putamus parum claram, anteposuerit litterarum formas humanitatis per seacula quarta decima et quinta decima.
+
+Eodem modo typi, qui nunc nobis videntur parum clari, fiant sollemnes in futurum. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat.
+
+Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio dignissim qui blandit praesent luptatum zzril delenit augue duis dolore te feugait nulla facilisi.
+
+At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua.
+
+Consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat. At vero eos et accusam et justo duo dolores et ea rebum, stet clita kasd gubergren, no sea takimata sanctus est.
+
+\end{g-brief}
+\end{document}