diff --git a/template-parts/related-posts/card.php b/template-parts/related-posts/card.php
new file mode 100644
index 0000000..57e24d5
--- /dev/null
+++ b/template-parts/related-posts/card.php
@@ -0,0 +1,67 @@
+<?php
+/**
+ * Related posts card template part.
+ *
+ * Variables:
+ * - $post: WP_Post object with thumbnail, title, excerpt, date.
+ *
+ * @package peptide-repo-core
+ */
+
+if ( ! isset( $args['post'] ) ) {
+	return;
+}
+
+$post = $args['post'];
+?>
+<article class="pr-related-posts__card">
+	<?php
+	if ( has_post_thumbnail( $post ) ) {
+		?>
+		<div class="pr-related-posts__image">
+			<?php
+			echo wp_kses_post(
+				get_the_post_thumbnail(
+					$post,
+					'post-thumbnail',
+					[
+						'class'    => 'pr-related-posts__image-element',
+						'loading'  => 'lazy',
+						'decoding' => 'async',
+					]
+				)
+			);
+			?>
+		</div>
+		<?php
+	} else {
+		?>
+		<div class="pr-related-posts__image pr-related-posts__image--fallback">
+			<img src="<?php echo esc_url( get_site_icon_url( 512 ) ); ?>" alt="<?php esc_attr_e( 'Site logo', 'peptide-repo-core' ); ?>" class="pr-related-posts__image-element" loading="lazy" decoding="async" />
+		</div>
+		<?php
+	}
+	?>
+	<div class="pr-related-posts__content">
+		<span class="pr-related-posts__badge"><?php esc_html_e( 'Article', 'peptide-repo-core' ); ?></span>
+		<h3 class="pr-related-posts__title">
+			<a href="<?php echo esc_url( get_permalink( $post ) ); ?>">
+				<?php echo esc_html( $post->post_title ); ?>
+			</a>
+		</h3>
+		<time class="pr-related-posts__date" datetime="<?php echo esc_attr( mysql2date( 'c', $post->post_date ) ); ?>">
+			<?php echo esc_html( mysql2date( get_option( 'date_format' ), $post->post_date ) ); ?>
+		</time>
+		<?php
+		if ( $post->post_excerpt ) {
+			$excerpt = wp_strip_all_tags( $post->post_excerpt );
+			$excerpt = wp_kses_post( wp_trim_words( $excerpt, 20 ) );
+			?>
+			<p class="pr-related-posts__excerpt">
+				<?php echo wp_kses_post( $excerpt ); ?>
+			</p>
+			<?php
+		}
+		?>
+	</div>
+</article>