diff --git a/modules/home.nix b/modules/home.nix
index 1d69ac8..6c5a469 100644
--- a/modules/home.nix
+++ b/modules/home.nix
@@ -323,6 +323,31 @@ in
     # Keep the GTK2 rc out of $HOME (default ~/.gtkrc-2.0). Setting this also
     # makes home-manager export GTK2_RC_FILES so GTK2 apps still find it.
     gtk2.configLocation = "${config.xdg.configHome}/gtk-2.0/gtkrc";
+    # The theme *name* alone isn't enough: the qgtk3 Qt bridge and apps' dark
+    # detection (e.g. keepassxc's "auto" theme) read this flag, not the name.
+    # Set it so both GTK apps and the Qt-via-gtk3 apps resolve to dark.
+    gtk3.extraConfig.gtk-application-prefer-dark-theme = true;
+    gtk4.extraConfig.gtk-application-prefer-dark-theme = true;
+  };
+
+  # The canonical dark/light signal on Wayland: apps query the xdg-desktop-portal
+  # Settings interface for org.freedesktop.appearance/color-scheme over D-Bus, and
+  # the gtk portal serves that from this dconf key. keepassxc's "auto" theme reads
+  # it (NixUtils::isDarkMode) and ignores the GTK theme name / Qt style entirely,
+  # so without this the portal reports 0 ("no preference") and keepass stays light.
+  # prefer-dark makes the portal report dark to every color-scheme-aware app.
+  dconf.settings."org/gnome/desktop/interface".color-scheme = "prefer-dark";
+
+  # Match the Qt apps (keepassxc, pinentry-qt, ssh askpass) to the GTK
+  # Adwaita-dark above, else they render the default light Fusion style. Use the
+  # gtk3 platform theme, not an adwaita *style* override: nixpkgs wraps Qt apps
+  # with a baked QT_PLUGIN_PATH pointing only at their build deps, so an external
+  # style plugin (adwaita-qt) is unreachable and QT_STYLE_OVERRIDE is silently
+  # ignored. The gtk3 plugin (libqgtk3) ships inside qtbase itself, so it's
+  # always on that path, and it reads the GTK theme (Adwaita-dark) directly.
+  qt = {
+    enable = true;
+    platformTheme.name = "gtk3";
   };
 
   # The home-manager Hyprland module below enables xdg.portal and pins the