pdfa.tex

\usepackage[a-1b]{pdfx}

% workadound for broken microtype in TL2018
% \usepackage{luatexbase}

% fonts
\usepackage{fontspec}

% math
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{mathtools}

%   mathrm=sym,        % use math font for mathrm, not text font
\usepackage[
  math-style=ISO,
  bold-style=ISO,
  sans-style=italic,
  nabla=upright,
  partial=upright,
]{unicode-math}

\usepackage[
  locale=BR,
  separate-uncertainty=true,
  per-mode=reciprocal,
]{siunitx}
\sisetup{math-micro=\text{µ},text-micro=µ}


% \setromanfont{Libertinus Serif}
% \setsansfont{Libertinus Sans}
% \setmonofont{Fira Code}[Scale=MatchLowercase]
% \setmathfont{Libertinus Math}
% \setmathfont{XITS Math}[range={scr, bfscr}]
% \setmathfont{XITS Math}[range={cal, bfcal}, StylisticSet=1]


% for pdf/a compliance, see https://tex.stackexchange.com/a/474336/59716
\pdfvariable omitcidset=1