--- a/docs/conf.py	Wed May 13 18:17:44 2026 +0200
+++ b/docs/conf.py	Wed May 13 18:34:29 2026 +0200
@@ -132,6 +132,7 @@
 
 # -- Options for LaTeX output ------------------------------------------------
 
+latex_engine = 'lualatex'
 latex_elements = {
     # The paper size ('letterpaper' or 'a4paper').
     #
@@ -141,26 +142,20 @@
     #
     'pointsize': '11pt',
 
-    # Additional stuff for the LaTeX preamble.
-    #
-    # NOTE: "inconsolata" in "fontpkg" errors within pdfTeX: seems to be
-    #       incompatible with some header package.
-    #
-    'preamble': r'''
-        \usepackage{inconsolata}
-    ''',
-
-   'fontpkg': r'''
-        \usepackage{charter}
-        \usepackage[defaultsans]{lato}
-    ''',
+    'babel': r'\usepackage{babel}',
+    'fontpkg': r'\usepackage[charter]{my-doc-fonts}',
 
     # Latex figure (float) alignment
     #
     # 'figure_align': 'htbp',
     # Use "Version" instead of "Release" on the title
     'releasename': 'Version',
+
+    'fncychap': r'\usepackage[Sonny]{fncychap}',
 }
+latex_additional_files = [
+    "_latex/my-doc-fonts.sty",
+]
 
 # Grouping the document tree into LaTeX files. List of tuples
 # (source start file, target name, title,