Vertically aligning hyphens and en dash in a compound word

Question

I was wondering if there is a way to make the hyphen and en dash in a compound word appear at the same "height." For instance the style guide I'm following suggests using en dash to reduce the ambiguity in post-apocalyptic-–science fiction movies. It's only a small difference but I was curious if there is a proper way to handle this.

Here is a screenshot of what they suggest it should look like:

And here is what it looks like in my final pdf doc, notice how the hyphen is at one height and the en dash is at another:

Here is an MWE:

\documentclass[]{book}

\begin{document}
post-apocalyptic--science fiction movies
\end{document}

Answer 1

You can define a "double hyphen" (if you really have to use it)

\documentclass{article}
\newcommand\dblhyphen{\mbox{-\kern-.1em-}\discretionary{}{}{}}
\begin{document}
post-apocalyptic\dblhyphen science fiction movies
\end{document}

Answer 2

use another font, e.g. Libertine as

\usepackage{libertine}% for pdflatex
\usepackage{libertineotf}% for xelatex/lualatex

Here the example for xelatex

\documentclass[]{book}
\usepackage{libertineotf}
\begin{document}
post-apocalyptic--science fiction movies
\end{document}