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function qrt_add_reading_time( $content ) {
    // Only on single posts in the main loop
    if ( ! is_singular( 'post' ) || ! in_the_loop() || ! is_main_query() ) {
        return $content;
    }

    // 1. Strip HTML/shortcodes, count words
    $plain   = wp_strip_all_tags( strip_shortcodes( get_post()->post_content ) );
    $words   = str_word_count( $plain );

    // 2. Estimate: 200 words per minute
    $minutes = max( 1, ceil( $words / 200 ) );

    // 3. Build the badge
    $badge = sprintf(
        '<p class="qrt-badge" aria-label="%s"><span>%s</span></p>',
        esc_attr__( 'Estimated reading time', 'quick-reading-time' ),
        /* translators: %s = minutes */
        esc_html( sprintf( _n( '%s min read', '%s mins read', $minutes, 'quick-reading-time' ), $minutes ) )
    );

    return $badge . $content;
}
add_filter( 'the_content', 'qrt_add_reading_time' );