diff --git a/lib/gnome-theme.sh b/lib/gnome-theme.sh
index 9cac197..6906428 100644
--- a/lib/gnome-theme.sh
+++ b/lib/gnome-theme.sh
@@ -117,7 +117,8 @@ gnometheme_enable() {
     info "Applying the SteamOS look to GNOME..."
     gset gnometheme org.gnome.desktop.interface color-scheme "'prefer-dark'"
     gset gnometheme org.gnome.desktop.interface accent-color "'blue'" || true
-    gset gnometheme org.gnome.desktop.interface gtk-theme "'Vapor'" || true
+    # adw-gtk3 follows the light/dark style of Settings > Appearance (CachyOS's adw-gtk3-dark would pin it dark).
+    [[ -d /usr/share/themes/adw-gtk3 ]] && gset gnometheme org.gnome.desktop.interface gtk-theme "'adw-gtk3'"
     # Windows with minimize and maximize buttons, like Ubuntu (GNOME shows only close by default).
     gset gnometheme org.gnome.desktop.wm.preferences button-layout "'appmenu:minimize,maximize,close'" || true
     if [[ -f "$GNOME_THEME_WALLPAPER" ]]; then
diff --git a/patches/steamify-gnome-gtk4.css b/patches/steamify-gnome-gtk4.css
index b137341..a0b2fb3 100644
--- a/patches/steamify-gnome-gtk4.css
+++ b/patches/steamify-gnome-gtk4.css
@@ -1,14 +1,20 @@
-/* Steamify Vapor: libadwaita/GTK4 colors, from Vapor's palette (cachyos-vapor, Vapor.colors). */
-@define-color accent_bg_color #569fcc;
-@define-color accent_fg_color #1f1f26;
-@define-color accent_color #3daee9;
-@define-color window_bg_color #24272c;
-@define-color window_fg_color #eff0f1;
-@define-color view_bg_color #151c23;
-@define-color view_fg_color #eff0f1;
-@define-color headerbar_bg_color #24272c;
-@define-color headerbar_fg_color #eff0f1;
-@define-color card_bg_color #2a2e32;
-@define-color popover_bg_color #2a2e32;
-@define-color sidebar_bg_color #1f2328;
-@define-color dialog_bg_color #2a2e32;
+/* Steamify Vapor: libadwaita/GTK4 colors. In the dark style: Vapor's palette (cachyos-vapor, Vapor.colors);
+ * in the light style (Settings > Appearance): libadwaita's own light colors, with Vapor's blue accent. */
+@define-color accent_bg_color #2a8fd0;
+@define-color accent_fg_color #ffffff;
+@define-color accent_color #1b6ea7;
+@media (prefers-color-scheme: dark) {
+  @define-color accent_bg_color #569fcc;
+  @define-color accent_fg_color #1f1f26;
+  @define-color accent_color #3daee9;
+  @define-color window_bg_color #24272c;
+  @define-color window_fg_color #eff0f1;
+  @define-color view_bg_color #151c23;
+  @define-color view_fg_color #eff0f1;
+  @define-color headerbar_bg_color #24272c;
+  @define-color headerbar_fg_color #eff0f1;
+  @define-color card_bg_color #2a2e32;
+  @define-color popover_bg_color #2a2e32;
+  @define-color sidebar_bg_color #1f2328;
+  @define-color dialog_bg_color #2a2e32;
+}