Balance light navigation transparency

src/lib/components/Cabecera.svelte

@@ -227,13 +227,15 @@
 	 * contraste de la navegación.
 	 */
 	:global(:root[data-tema='claro']) .cabecera {
+		--desenfoque: blur(8px) saturate(1.3);
+
 		background-image: none;
-		background-color: color-mix(in oklab, var(--c-bg) 82%, transparent);
+		background-color: color-mix(in oklab, var(--c-bg) 58%, transparent);
 		backdrop-filter: var(--desenfoque);
 	}
 
 	:global(:root[data-tema='claro']) .cabecera.desplazada {
-		background-color: color-mix(in oklab, var(--c-bg) 88%, transparent);
+		background-color: color-mix(in oklab, var(--c-bg) 68%, transparent);
 	}
 
 	.fila {