Wrap dark input defaults in @layer base so utilities can override

src/routes/layout.css

@@ -31,6 +31,7 @@ body {
   display: none;
 }
 
+ @layer base {
     /* Form inputs in dark mode — the forms plugin defaults to a white background,
     which would punch holes through panels. Override at the element level so we
     don't have to add `dark:bg-neutral-800` to every <input>/<textarea>. */
@@ -44,6 +45,7 @@ body {
     :where(.dark) textarea::placeholder {
     color: var(--color-neutral-500);
     }
+}
 
 /* Tighter heading rhythm for all rendered (prose) content. Overrides the
    typography plugin's em-based heading margins; the first block stays flush. */