Minor layout refactoring

assets/css/main.css

@@ -87,6 +87,7 @@
 		/*	Layout. */
 		--deus-body-padding: 6rem 1rem;
 		--deus-post-padding: 1.25rem;
+		--deus-mobile-post-heading-inset: 1.75rem;
 	}
 }
 @media only screen and (max-width: 520px) {
@@ -362,7 +363,7 @@ article + article {
 }
 @media only screen and (max-width: 960px) {
 	article + article {
-		margin-top: calc(1.75rem + var(--deus-post-spacing));
+		margin-top: calc(var(--deus-mobile-post-heading-inset) + var(--deus-post-spacing));
 	}
 }
 
@@ -435,14 +436,14 @@ article h1::after {
 	article h1 {
 		float: none;
 		margin:
-			calc(-1 * (var(--deus-post-padding) + 1.75rem))
+			calc(-1 * (var(--deus-post-padding) + var(--deus-mobile-post-heading-inset)))
 			calc(var(--deus-post-heading-spacing) + 4px)
 			2rem
 			calc(var(--deus-post-heading-spacing) + 4px);
 		text-align: center;
 	}
 	article h1::after {
-		top: calc(1.75rem - 1px);
+		top: calc(var(--deus-mobile-post-heading-inset) - 1px);
 		right: calc(-1 * (var(--deus-post-heading-spacing) + 2px));
 		box-shadow:
 			 0   1px 0 0   var(--deus-body-background-color),