<?php $css_modules = new CSS_Module( get_template_directory() . '/assets/css/theme.json' ); ?>
<?php $article_cn = $css_modules->get_class_names( 'components/_main-article.css' ); ?>
<article class="<?php echo esc_attr( $article_cn( 'container' ) ); ?>">
    <h1 class="<?php echo esc_attr( $article_cn( 'title' ) ); ?>">My style is scoped.</h1>
</article>