Enhance Theme Templates and Editor Layout

editor-style.css

@@ -44,7 +44,8 @@
 
 /* Match the frontend's light canvas. The admin chrome is intentionally untouched. */
 body.editor-styles-wrapper {
-  max-width: 760px;
+  /* The canvas may be wide; theme.json constrains normal blocks to contentSize. */
+  max-width: var(--wp--style--global--wide-size, 1180px);
   padding: 2rem;
   margin: 0 auto;
   background: #f8f5f0;
@@ -86,10 +87,24 @@ body.editor-styles-wrapper {
 
 /*
  * theme.json supplies contentSize and wideSize to Gutenberg's root container.
- * Do not override its alignment geometry here: it also handles full-width blocks
+ * Do not override block alignment geometry here: it also handles full-width blocks
  * in the editor sidebar and other constrained editor layouts.
  */
 
+/* The post-title control sits outside Gutenberg's root block container. */
+.editor-post-title,
+.editor-post-title__block {
+  width: 100%;
+  max-width: var(--wp--style--global--wide-size, 1180px) !important;
+  margin-right: auto !important;
+  margin-left: auto !important;
+}
+
+.editor-post-title__input {
+  width: 100%;
+  max-width: none !important;
+}
+
 
 .editor-styles-wrapper a {
   color: #c3480b;