diff --git a/modules/darwin/karabiner.nix b/modules/darwin/karabiner.nix
index e41cd7b..102ccac 100644
--- a/modules/darwin/karabiner.nix
+++ b/modules/darwin/karabiner.nix
@@ -68,7 +68,8 @@ let
     ]) numbers
   );
 
-  simple_modifications = [
+  # Swap Fn/Globe and left Control only on the built-in keyboard.
+  builtinKeyboardSimpleModifications = [
     {
       from.apple_vendor_top_case_key_code = "keyboard_fn";
       to = [ { key_code = "left_control"; } ];
@@ -85,6 +86,7 @@ let
     is_keyboard = true;
   };
 
+  # Swap the G213's Windows/Alt modifiers.
   logitechG213SimpleModifications = [
     {
       from.key_code = "left_command";
@@ -96,6 +98,38 @@ let
     }
   ];
 
+  logitechMouseIdentifiers = {
+    vendor_id = 1133;
+    product_id = 50503;
+    is_pointing_device = true;
+  };
+
+  # Middle click sends Fn; side buttons navigate back and forward.
+  logitechMouseSimpleModifications = [
+    {
+      from.pointing_button = "button3";
+      to = [ { apple_vendor_top_case_key_code = "keyboard_fn"; } ];
+    }
+    {
+      from.pointing_button = "button4";
+      to = [
+        {
+          key_code = "open_bracket";
+          modifiers = [ "left_command" ];
+        }
+      ];
+    }
+    {
+      from.pointing_button = "button5";
+      to = [
+        {
+          key_code = "close_bracket";
+          modifiers = [ "left_command" ];
+        }
+      ];
+    }
+  ];
+
   complex_modifications = {
     name = "Complex Modifications";
     rules = [
@@ -319,16 +353,24 @@ let
         name = "default";
         selected = true;
         virtual_hid_keyboard.keyboard_type_v2 = "ansi";
-        inherit simple_modifications;
         inherit complex_modifications;
 
         devices = [
+          {
+            identifiers = {
+              is_keyboard = true;
+              is_built_in_keyboard = true;
+            };
+            simple_modifications = builtinKeyboardSimpleModifications;
+          }
           {
             identifiers = logitechG213Identifiers;
             simple_modifications = logitechG213SimpleModifications;
           }
           {
-            identifiers.is_keyboard = true;
+            identifiers = logitechMouseIdentifiers;
+            ignore = false;
+            simple_modifications = logitechMouseSimpleModifications;
           }
         ];
       }
diff --git a/modules/linux/dns.nix b/modules/linux/dns.nix
index d900e1f..deb39ec 100644
--- a/modules/linux/dns.nix
+++ b/modules/linux/dns.nix
@@ -1,14 +1,13 @@
 { config, lib, ... }: let
-  inherit (lib) mkIf concatStringsSep;
+  inherit (lib) mkIf;
 in {
   services.resolved = mkIf (!config.isServer) {
     enable = true;
 
-    extraConfig = config.dnsServers
-      |> map (server: "DNS=${server}")
-      |> concatStringsSep "\n";
-
-    dnssec     = "true";
-    dnsovertls = "true";
+    settings.Resolve = {
+      DNS = config.dnsServers;
+      DNSSEC = true;
+      DNSOverTLS = true;
+    };
   };
 }