diff --git a/settings/gnome.nix b/settings/gnome.nix
index 4fa16b2..ae5861f 100644
--- a/settings/gnome.nix
+++ b/settings/gnome.nix
@@ -49,7 +49,7 @@
 
     qt = {
       enable = true;
-      platformTheme = "gnome";
+      platformTheme = "adwaita";
       style = "adwaita-dark";
     };
 
@@ -60,25 +60,21 @@
     home-manager.users.fred = { config, lib, pkgs, ... }: {
       # Minimal titlebars — stylix manages the GTK theme; we layer our
       # headerbar shrink on top via programs.gtk.*.extraCss.
-      gtk = {
-        enable = true;
-        gtk3.extraCss = ''
-          headerbar { min-height: 0; padding: 0; margin: 0; }
-          headerbar .title { font-size: 0; }
-        '';
-        gtk4.extraCss = ''
-          headerbar { min-height: 0; padding: 0; margin: 0; }
-          headerbar .title { font-size: 0; }
-          window:backdrop {
-            background-color: @window_bg_color;
-            color: @window_fg_color;
-          }
-          window:backdrop headerbar {
-            background-color: @headerbar_bg_color;
-            color: @headerbar_fg_color;
-          }
-        '';
-      };
+      gtk.enable = true;
+      # gtk.gtk3.extraCss / gtk4.extraCss are no-ops once stylix owns the
+      # theme — extra CSS has to go through stylix.targets.gtk.extraCss.
+      stylix.targets.gtk.extraCss = ''
+        headerbar { min-height: 0; padding: 0; margin: 0; }
+        headerbar .title { font-size: 0; }
+        window:backdrop {
+          background-color: @window_bg_color;
+          color: @window_fg_color;
+        }
+        window:backdrop headerbar {
+          background-color: @headerbar_bg_color;
+          color: @headerbar_fg_color;
+        }
+      '';
 
       # GNOME dconf settings — stylix owns colour-scheme, gtk-theme,
       # cursor-theme and accent-color now.