diff --git a/wp-content/themes/apus-theme/assets/css/style.css b/wp-content/themes/apus-theme/assets/css/style.css
index 38673ff7..2f250794 100644
--- a/wp-content/themes/apus-theme/assets/css/style.css
+++ b/wp-content/themes/apus-theme/assets/css/style.css
@@ -1005,3 +1005,48 @@ img {
 .toc-list::-webkit-scrollbar-thumb:hover {
     background: var(--color-neutral-700);
 }
+
+/* === CTA BOX SIDEBAR === */
+
+.cta-box-sidebar {
+    background: var(--color-orange-primary);
+    border-radius: 8px;
+    padding: 24px;
+    text-align: center;
+    margin-top: 0;
+    margin-bottom: 15px;
+    height: 250px;
+    display: flex;
+    flex-direction: column;
+    justify-content: center;
+    box-shadow: 0 4px 12px rgba(255, 133, 0, 0.2);
+}
+
+.cta-box-title {
+    color: #ffffff;
+    font-weight: 700;
+    font-size: 1.25rem;
+    margin-bottom: 1rem;
+}
+
+.cta-box-text {
+    color: rgba(255, 255, 255, 0.95);
+    font-size: 0.9rem;
+    margin-bottom: 1rem;
+}
+
+.btn-cta-box {
+    background-color: #ffffff;
+    color: var(--color-orange-primary);
+    font-weight: 700;
+    border: none;
+    padding: 0.75rem 1.5rem;
+    border-radius: 8px;
+    transition: all 0.3s ease;
+    font-size: 1rem;
+}
+
+.btn-cta-box:hover {
+    background-color: var(--color-navy-primary);
+    color: #ffffff;
+}
diff --git a/wp-content/themes/apus-theme/single.php b/wp-content/themes/apus-theme/single.php
index 524ad217..2c564212 100644
--- a/wp-content/themes/apus-theme/single.php
+++ b/wp-content/themes/apus-theme/single.php
@@ -198,7 +198,8 @@ get_header();
 			<div class="sidebar-sticky">
 				<?php get_template_part('template-parts/content', 'toc'); ?>
 
-				<!-- Aquí irá el CTA Box (componente 12) -->
+				<!-- CTA Box -->
+				<?php get_template_part('template-parts/content', 'cta-box'); ?>
 			</div>
 		</div>
 
diff --git a/wp-content/themes/apus-theme/template-parts/content-cta-box.php b/wp-content/themes/apus-theme/template-parts/content-cta-box.php
new file mode 100644
index 00000000..4adc206d
--- /dev/null
+++ b/wp-content/themes/apus-theme/template-parts/content-cta-box.php
@@ -0,0 +1,25 @@
+<?php
+/**
+ * Template Part: CTA Box Sidebar
+ *
+ * Caja de llamada a la acción naranja en el sidebar
+ * Abre el modal de contacto al hacer clic
+ *
+ * @package APUs_Theme
+ * @since 1.0.0
+ */
+
+// Solo mostrar CTA Box si estamos en single post
+if (!is_single()) {
+    return;
+}
+?>
+
+<!-- CTA Box Sidebar -->
+<div class="cta-box-sidebar">
+    <h5 class="cta-box-title">¿Listo para potenciar tus proyectos?</h5>
+    <p class="cta-box-text">Accede a nuestra biblioteca completa de APUs y herramientas profesionales.</p>
+    <button class="btn btn-cta-box w-100" data-bs-toggle="modal" data-bs-target="#contactModal">
+        Solicitar Información
+    </button>
+</div>