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diff --git a/templates/qt-gtk/README.md b/templates/qt-gtk/README.md
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+# Qt and GTK
+
+Catppuccin Macchiato with a **lavender** accent, fixed rather than
+wallpaper-tracking: Qt and GTK apps only pick up a theme change when they
+restart, so a moving accent would leave running apps disagreeing with new ones.
+
+Lavender is also `udt-accent`'s fallback, so anything without a wallpaper-derived
+accent lands on the same colour.
+
+## Upstream themes
+
+Neither is generated by this repo; both are installed from upstream.
+
+| | Theme | Source |
+| --- | --- | --- |
+| Qt5 + Qt6 | `catppuccin-macchiato-lavender` | `catppuccin/Kvantum` |
+| GTK3 + GTK4 | `catppuccin-macchiato-lavender-standard+default` | `catppuccin/gtk` v1.0.3 |
+
+`catppuccin/gtk` is **archived upstream**. v1.0.3 works and is what the
+ecosystem uses, but it will not track future GTK4/libadwaita changes. Removing
+it is just deleting the directory from `~/.themes`.
+
+## Wiring
+
+- **Qt5/Qt6**: `style=kvantum-dark` in both `qt5ct.conf` and `qt6ct.conf`, with
+  `custom_palette=false` so Kvantum supplies the palette. Previously the two
+  disagreed: qt5ct used a hand-rolled grey/purple scheme and qt6ct used
+  `/usr/share/qt6ct/colors/darker.conf`.
+- **GTK3**: the theme name has to be set with **gsettings**, not just
+  `settings.ini`. On Wayland gsettings wins, and it was pinned to `Breeze`,
+  which silently overrode the file. `icon-theme` was likewise stuck on
+  `breeze-dark` while `settings.ini` said `Material-Black-Plum-Suru`.
+- **GTK4**: libadwaita ignores `gtk-theme-name`, so `~/.config/gtk-4.0/theme`
+  is a symlink to the theme's `gtk-4.0` directory and `gtk.css` imports it.
+
+## Reproducing
+
+    gsettings set org.gnome.desktop.interface gtk-theme 'catppuccin-macchiato-lavender-standard+default'
+    gsettings set org.gnome.desktop.interface icon-theme 'Material-Black-Plum-Suru'
+    gsettings set org.gnome.desktop.interface color-scheme 'prefer-dark'
diff --git a/templates/qt-gtk/gtk3-settings.ini b/templates/qt-gtk/gtk3-settings.ini
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+++ b/templates/qt-gtk/gtk3-settings.ini
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+[Settings]
+gtk-application-prefer-dark-theme=true
+gtk-button-images=1
+gtk-cursor-theme-name=Oxygen_Zion
+gtk-cursor-theme-size=24
+gtk-decoration-layout=icon:minimize,maximize,close
+gtk-enable-animations=true
+gtk-font-name=Noto Sans,  10
+gtk-icon-theme-name=Material-Black-Plum-Suru
+gtk-menu-images=1
+gtk-modules=colorreload-gtk-module:window-decorations-gtk-module
+gtk-primary-button-warps-slider=false
+gtk-theme-name=catppuccin-macchiato-lavender-standard+default
+gtk-toolbar-style=GTK_TOOLBAR_BOTH_HORIZ
+gtk-xft-dpi=98304
+gtk-toolbar-icon-size=GTK_ICON_SIZE_LARGE_TOOLBAR
+gtk-enable-event-sounds=1
+gtk-enable-input-feedback-sounds=1
+gtk-xft-antialias=1
+gtk-xft-hinting=1
+gtk-xft-hintstyle=hintmedium
diff --git a/templates/qt-gtk/gtk4-gtk.css b/templates/qt-gtk/gtk4-gtk.css
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+++ b/templates/qt-gtk/gtk4-gtk.css
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+/* Catppuccin Macchiato (lavender) for GTK4 / libadwaita.
+ * libadwaita ignores gtk-theme-name, so the theme's own stylesheet is imported
+ * here instead. Assets are symlinked next to this file. */
+@import url("theme/gtk.css");
+
+/* vte terminal: local override, kept from the previous config. */
+VteTerminal {
+    padding: 10px;
+    -VteTerminal-inner-border: 10px;
+}
diff --git a/templates/qt-gtk/kvantum.kvconfig b/templates/qt-gtk/kvantum.kvconfig
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+++ b/templates/qt-gtk/kvantum.kvconfig
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+[General]
+theme=catppuccin-macchiato-lavender
diff --git a/templates/qt-gtk/qt5ct.conf b/templates/qt-gtk/qt5ct.conf
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+++ b/templates/qt-gtk/qt5ct.conf
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+# Theme-relevant keys only; the live file carries other settings.
+[Appearance]
+custom_palette=false
+icon_theme=Material-Black-Plum-Suru
+standard_dialogs=xdgdesktopportal
+style=kvantum-dark
+[Fonts]
+fixed="Inconsolata Nerd Font Mono,14,-1,5,50,0,0,0,0,0"
+general="Noto Sans,14,-1,5,50,0,0,0,0,0,Regular"
+[Interface]
+[SettingsWindow]
+[Troubleshooting]
diff --git a/templates/qt-gtk/qt6ct.conf b/templates/qt-gtk/qt6ct.conf
new file mode 100644
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+++ b/templates/qt-gtk/qt6ct.conf
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+# Theme-relevant keys only; the live file carries other settings.
+[Appearance]
+custom_palette=false
+icon_theme=Material-Black-Plum-Suru
+standard_dialogs=xdgdesktopportal
+style=kvantum-dark
+[Fonts]
+fixed="Inconsolata Nerd Font Mono,14,-1,5,400,0,0,0,0,0,0,0,0,0,0,1,,0,0"
+general="Noto Sans,14,-1,5,400,0,0,0,0,0,0,0,0,0,0,1,Regular,0,0"
+[Interface]
+[QSSEditor]
+[SettingsWindow]
+[Troubleshooting]