diff --git a/lyrathorpe/catppuccin-mocha.nix b/lyrathorpe/catppuccin-mocha.nix
new file mode 100644
index 0000000..d621b95
--- /dev/null
+++ b/lyrathorpe/catppuccin-mocha.nix
@@ -0,0 +1,26 @@
+# Catppuccin Mocha palette. Raw 6-digit hex (no leading "#"); consumers add a
+# "#" where their format needs it. Shared by the Sway desktop theming
+# (home/sway.nix) and the ReGreet greeter (swaywm.nix) so the two stay in sync.
+{
+  base = "1e1e2e";
+  mantle = "181825";
+  crust = "11111b";
+  surface0 = "313244";
+  surface1 = "45475a";
+  surface2 = "585b70";
+  overlay0 = "6c7086";
+  subtext0 = "a6adc8";
+  subtext1 = "bac2de";
+  text = "cdd6f4";
+  rosewater = "f5e0dc";
+  red = "f38ba8";
+  maroon = "eba0ac";
+  peach = "fab387";
+  yellow = "f9e2af";
+  green = "a6e3a1";
+  teal = "94e2d5";
+  sapphire = "74c7ec";
+  blue = "89b4fa";
+  mauve = "cba6f7";
+  pink = "f5c2e7";
+}
diff --git a/lyrathorpe/home/sway.nix b/lyrathorpe/home/sway.nix
index 2a86e58..9ba4acd 100644
--- a/lyrathorpe/home/sway.nix
+++ b/lyrathorpe/home/sway.nix
@@ -15,31 +15,10 @@
   ...
 }:
 let
-  # Catppuccin Mocha. Raw 6-digit hex (no leading "#"); prefix "#" where a
-  # consumer needs it -- Sway/i3status/dunst want "#", foot/swaylock do not.
-  ctp = {
-    base = "1e1e2e";
-    mantle = "181825";
-    crust = "11111b";
-    surface0 = "313244";
-    surface1 = "45475a";
-    surface2 = "585b70";
-    overlay0 = "6c7086";
-    subtext0 = "a6adc8";
-    subtext1 = "bac2de";
-    text = "cdd6f4";
-    rosewater = "f5e0dc";
-    red = "f38ba8";
-    maroon = "eba0ac";
-    peach = "fab387";
-    yellow = "f9e2af";
-    green = "a6e3a1";
-    teal = "94e2d5";
-    sapphire = "74c7ec";
-    blue = "89b4fa";
-    mauve = "cba6f7";
-    pink = "f5c2e7";
-  };
+  # Catppuccin Mocha (shared with the ReGreet greeter). Raw hex; prefix "#"
+  # where a consumer needs it -- Sway/i3status/dunst want "#", foot/swaylock do
+  # not.
+  ctp = import ../catppuccin-mocha.nix;
 in
 {
   wayland.windowManager.sway = {
diff --git a/lyrathorpe/swaywm.nix b/lyrathorpe/swaywm.nix
index b90192c..84e9bf4 100644
--- a/lyrathorpe/swaywm.nix
+++ b/lyrathorpe/swaywm.nix
@@ -7,6 +7,8 @@
 
 let
   cfg = config.features.swayDesktop;
+  # Catppuccin Mocha (shared with the Sway desktop, see lyrathorpe/home/sway.nix).
+  ctp = import ./catppuccin-mocha.nix;
 in
 {
   options = {
@@ -51,6 +53,66 @@ in
     # services.displayManager.sessionPackages. Hosts that turn off
     # features.swayDesktop (e.g. EDaaS) keep plain TTY login.
     programs.regreet.enable = true;
+    # Theme the greeter to match the Sway desktop (Catppuccin Mocha). ReGreet is
+    # GTK; recolour via CSS (covering both libadwaita named colours and plain
+    # GTK node selectors) and use the same Noto Sans as the bar/notifications.
+    programs.regreet.font = {
+      name = "Noto Sans";
+      package = pkgs.noto-fonts;
+      size = 16;
+    };
+    programs.regreet.extraCss = ''
+      @define-color window_bg_color #${ctp.base};
+      @define-color window_fg_color #${ctp.text};
+      @define-color view_bg_color #${ctp.mantle};
+      @define-color view_fg_color #${ctp.text};
+      @define-color card_bg_color #${ctp.surface0};
+      @define-color card_fg_color #${ctp.text};
+      @define-color accent_bg_color #${ctp.blue};
+      @define-color accent_fg_color #${ctp.base};
+      @define-color accent_color #${ctp.blue};
+      @define-color destructive_bg_color #${ctp.red};
+      @define-color destructive_fg_color #${ctp.base};
+      @define-color error_color #${ctp.red};
+      @define-color warning_color #${ctp.peach};
+      @define-color success_color #${ctp.green};
+
+      window {
+        background-color: #${ctp.base};
+        color: #${ctp.text};
+      }
+
+      label {
+        color: #${ctp.text};
+      }
+
+      entry {
+        background-color: #${ctp.surface0};
+        color: #${ctp.text};
+        border: 1px solid #${ctp.surface1};
+      }
+
+      entry:focus-within {
+        border-color: #${ctp.blue};
+      }
+
+      button,
+      combobox button {
+        background-color: #${ctp.surface0};
+        color: #${ctp.text};
+        border: 1px solid #${ctp.surface1};
+      }
+
+      button:hover {
+        background-color: #${ctp.surface1};
+      }
+
+      button:active,
+      button:checked {
+        background-color: #${ctp.blue};
+        color: #${ctp.base};
+      }
+    '';
     # cage reads the XKB_* environment at startup, so force the greeter onto the
     # same Dvorak layout as the Sway session (home/sway.nix) -- otherwise the
     # password field would be QWERTY. Dvorak is the "us" layout's variant, NOT a