diff --git a/configuration.nix b/configuration.nix
index 3780044..2cd0075 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -1,119 +1,194 @@
-{ config, inputs, lib, pkgs, ... }:
-
-let
-  nvidiaPackage = config.hardware.nvidia.package;
-in
-
 {
-  imports =
-    [ # Include the results of the hardware scan.
-      ./hardware-configuration.nix
-    ];
+  config,
+  inputs,
+  lib,
+  pkgs,
+  ...
+}: {
+  imports = [
+    ./hardware-configuration.nix
+  ];
 
-    # Allow unfree packages
-  nixpkgs.config.allowUnfree = true;
+  nixpkgs = {
+    config.allowUnfree = true;
+    overlays = [
+      (self: super: {
+        hyprland = inputs.hyprland-git.packages."x86_64-linux".hyprland;
+      })
+    ];
+  };
+  nix.settings = {
+    experimental-features = [
+      "nix-command"
+      "flakes"
+    ];
+    download-buffer-size = 524288000; # 500 MiB
+  };
 
   # Use the systemd-boot EFI boot loader.
-  boot.loader.systemd-boot.enable = true;
-  boot.loader.efi.canTouchEfiVariables = true;
-  programs.silentSDDM = {
+  boot.loader = {
+    systemd-boot.enable = true;
+    efi.canTouchEfiVariables = true;
+  };
+
+  # Set your time zone.
+  time.timeZone = "America/Chicago";
+  # Select internationalisation properties.
+  i18n.defaultLocale = "en_US.UTF-8";
+  console = {
+    font = "Lat2-Terminus16";
+    keyMap = "us";
+  };
+
+  networking = {
+    hostName = "girlCore";
+    networkmanager.enable = true;
+
+    firewall = {
+      enable = true;
+      allowedTCPPorts = [];
+      allowedUDPPorts = [];
+    };
+  };
+
+  users.users.ashley = {
+    isNormalUser = true;
+    extraGroups = ["wheel"]; # Enable ‘sudo’ for the user.
+    packages = with pkgs; [
+      tree
+    ];
+  };
+  home-manager = {
+    useGlobalPkgs = true;
+    useUserPackages = true;
+    extraSpecialArgs = {inherit inputs;};
+
+    users.ashley = import ./home.nix;
+  };
+
+  services = {
+    displayManager = {
+      sddm = {
         enable = true;
-        theme = "rei";
-        settings = {
+        wayland.enable = ! config.services.xserver.enable; # experimental
+      };
+      defaultSession = "hyprland";
+    };
+
+    xserver.videoDrivers = lib.mkDefault ["nvidia"];
+
+    # Enable touchpad support (enabled default in most desktopManager).
+    libinput.enable = true;
+
+    # Enable audio
+    # Multimedia Framework
+    # With backwards compatability for alsa/pulseaudio/jack
+    pipewire = {
+      enable = true;
+      wireplumber.enable = true;
+
+      alsa.enable = true;
+      alsa.support32Bit = true;
+
+      pulse.enable = true;
+      jack.enable = true;
+    };
+  };
+  security.rtkit.enable = true; # simplifies pipewire's life
+
+  programs = {
+    hyprland = {
+      enable = true;
+      withUWSM = true; # Universal Wayland Session Manager
+      xwayland.enable = true;
+    };
+
+    gamemode.enable = true;
+    steam = {
+      enable = true;
+      gamescopeSession.enable = true; # .desktop entry for gamescope
+
+      remotePlay.openFirewall = true;
+      dedicatedServer.openFirewall = true;
+      localNetworkGameTransfers.openFirewall = true;
+
+      # extraCompatPackages = with pkgs; [
+      #   proton-ge-bin
+      # ];
+    };
+
+    silentSDDM = {
+      enable = true;
+      theme = "rei";
+      settings = {
         "LoginScreen.LoginArea.Avatar" = {
           shape = "circle";
           active-border-color = "#ffcfce";
         };
         "LoginScreen" = {
-        background = "hana.jpg";
+          background = "hana.jpg";
         };
         "LockScreen" = {
-        background = "kokomi96024.png";
-        };
+          background = "kokomi96024.png";
         };
+      };
+    };
   };
-   networking.hostName = "girlCore"; # Define your hostname.
-  # Configure network connections interactively with nmcli or nmtui.
-  networking.networkmanager.enable = true;
-  # Set your time zone.
-  time.timeZone = "America/Chicago";
-  # Configure network proxy if necessary
-  # networking.proxy.default = "http://user:password@proxy:port/";
-  # networking.proxy.noProxy = "127.0.0.1,localhost,internal.domain";
-  # Select internationalisation properties.
-   i18n.defaultLocale = "en_US.UTF-8";
-   console = {
-     font = "Lat2-Terminus16";
-     keyMap = "us";
-   };
-  services.displayManager.sddm = {
-      enable = true;
-    wayland.enable = true;
-};
-  services.displayManager.defaultSession = "hyprland";
-  programs.hyprland.enable = true;
-  programs.hyprland.package = inputs.hyprland-git.packages."x86_64-linux".hyprland;
 
-      programs.steam = {
+  hardware = {
+    bluetooth = {
       enable = true;
-      remotePlay.openFirewall = true; # optional
-      dedicatedServer.openFirewall = true; # optional
-      localNetworkGameTransfers.openFirewall = true; # optional
-      gamescopeSession.enable = true; # optional
+      powerOnBoot = true;
+    };
+
+    graphics = {
+      enable = true;
+      enable32Bit = true;
     };
 
     # nvidia drivers
-  hardware.graphics.enable = true;
-  hardware.graphics.enable32Bit = true;
-  services.xserver.videoDrivers = lib.mkDefault [ "nvidia" ];
-  hardware.nvidia = {
-    modesetting.enable = true;
-    # Nvidia power management. Experimental, and can cause sleep/suspend to fail.
-    # Enable this if you have graphical corruption issues or application crashes after waking
-    # up from sleep. This fixes it by saving the entire VRAM memory to /tmp/ instead
-    # of just the bare essentials.
-    powerManagement.enable = false;
+    nvidia = {
+      package = config.boot.kernelPackages.nvidiaPackages.stable;
 
-    powerManagement.finegrained = false;
-    # open = true;
-    open = lib.mkOverride 990 (nvidiaPackage ? open && nvidiaPackage ? firmware);
-    # Enable the Nvidia settings menu,
-    # accessible via `nvidia-settings`.
-    nvidiaSettings = true;
-    package = config.boot.kernelPackages.nvidiaPackages.stable;
+      # WARNING: whether to use open-source or proprietary kernel modules
+      # open = lib.mkOverride 990 (package ? open && package ? firmware);
+      open = true;
+
+      nvidiaSettings = true;
+      modesetting.enable = true;
+      # Nvidia power management. Experimental, and can cause sleep/suspend to fail.
+      # Enable this if you have graphical corruption issues or application crashes after waking
+      # up from sleep. This fixes it by saving the entire VRAM memory to /tmp/ instead
+      # of just the bare essentials.
+      powerManagement = {
+        enable = false;
+        finegrained = false;
+      };
+    };
+  };
+
+  environment = {
+    # NOTE: loaded earlier than `environment.variables`
+    sessionVariables = {
+      # Hint Electrons apps to use Wayland
+      NIXOS_OZONE_WL = "1";
+    };
+
+    variables = {
+      EDITOR = "nvim";
+    };
+
+    # List packages installed in system profile.
+    # You can use https://search.nixos.org/ to find more packages (and options).
+    systemPackages = with pkgs; [
+      git
+      neovim
+      wget
+
+      steamcmd
+    ];
   };
-     services.pipewire = {
-     enable = true;
-     pulse.enable = true;
-   };
 
-  # Enable touchpad support (enabled default in most desktopManager).
-   services.libinput.enable = true;
-  # Define a user account. Don't forget to set a password with ‘passwd’.
-   users.users.ashley = {
-     isNormalUser = true;
-     extraGroups = [ "wheel" ]; # Enable ‘sudo’ for the user.
-     packages = with pkgs; [
-       tree
-     ];
-   };
-  # List packages installed in system profile.
-  # You can use https://search.nixos.org/ to find more packages (and options).
-   nix.settings.experimental-features = [ "nix-command" "flakes" ];
-   environment.systemPackages = with pkgs; [
-     git
-     neovim
-     wget
-  ];
-   environment.variables.EDITOR = "nvim";
-  # Some programs need SUID wrappers, can be configured further or are
-  # started in user sessions.
-  # List services that you want to enable:
-  # Enable the OpenSSH daemon.
-  # Open ports in the firewall.
-   networking.firewall.allowedTCPPorts = [ ];
-   networking.firewall.allowedUDPPorts = [ ];
-   networking.firewall.enable = true;
   # This option defines the first version of NixOS you have installed on this particular machine,
   # and is used to maintain compatibility with application data (e.g. databases) created on older NixOS versions.
   #
diff --git a/flake.lock b/flake.lock
index 012d233..4b1ad8b 100644
--- a/flake.lock
+++ b/flake.lock
@@ -161,7 +161,9 @@
         "hyprutils": "hyprutils",
         "hyprwayland-scanner": "hyprwayland-scanner",
         "hyprwire": "hyprwire",
-        "nixpkgs": "nixpkgs",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
         "pre-commit-hooks": "pre-commit-hooks",
         "systems": "systems",
         "xdph": "xdph"
@@ -428,22 +430,6 @@
       }
     },
     "nixpkgs": {
-      "locked": {
-        "lastModified": 1766070988,
-        "narHash": "sha256-G/WVghka6c4bAzMhTwT2vjLccg/awmHkdKSd2JrycLc=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "c6245e83d836d0433170a16eb185cefe0572f8b8",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixos-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "nixpkgs_2": {
       "locked": {
         "lastModified": 1771369470,
         "narHash": "sha256-0NBlEBKkN3lufyvFegY4TYv5mCNHbi5OmBDrzihbBMQ=",
@@ -487,7 +473,7 @@
         "home-manager": "home-manager",
         "hyprland-git": "hyprland-git",
         "nixcats": "nixcats",
-        "nixpkgs": "nixpkgs_2",
+        "nixpkgs": "nixpkgs",
         "silentSDDM": "silentSDDM"
       }
     },
diff --git a/flake.nix b/flake.nix
index 1bb731b..2177a33 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,8 +1,9 @@
 {
-description = "NixOS configuration";
+  description = "NixOS configuration";
 
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+
     # home-manager, used for managing user configuration
     home-manager = {
       url = "github:nix-community/home-manager/master";
@@ -12,40 +13,35 @@ description = "NixOS configuration";
       # to avoid problems caused by different versions of nixpkgs.
       inputs.nixpkgs.follows = "nixpkgs";
     };
+
     silentSDDM = {
       url = "github:uiriansan/SilentSDDM";
       inputs.nixpkgs.follows = "nixpkgs";
-   };
+    };
 
     nixcats.url = "github:BirdeeHub/nixCats-nvim";
 
-        hyprland-git = {
+    hyprland-git = {
       url = "github:hyprwm/Hyprland/25250527793eb04bb60f103abe7f06370b9f6e1c";
+      inputs.nixpkgs.follows = "nixpkgs";
     };
-
   };
 
-  outputs = inputs@{ nixpkgs, home-manager, nixcats, ... }: {
+  outputs = inputs @ {
+    nixpkgs,
+    home-manager,
+    silentSDDM,
+    ...
+  }: {
     nixosConfigurations = {
       girlCore = nixpkgs.lib.nixosSystem {
         specialArgs = {inherit inputs;};
         modules = [
           ./configuration.nix
-          inputs.silentSDDM.nixosModules.default
-
           # make home-manager as a module of nixos
           # so that home-manager configuration will be deployed automatically when executing `nixos-rebuild switch`
           home-manager.nixosModules.home-manager
-          {
-            home-manager.useGlobalPkgs = true;
-            home-manager.useUserPackages = true;
-
-            home-manager.extraSpecialArgs = { inherit inputs; };
-             
-            home-manager.users.ashley = import ./home.nix;
-
-            # Optionally, use home-manager.extraSpecialArgs to pass arguments to home.nix
-          }
+          silentSDDM.nixosModules.default
         ];
       };
     };
diff --git a/hardware-configuration.nix b/hardware-configuration.nix
index 1f129f7..a938f5c 100644
--- a/hardware-configuration.nix
+++ b/hardware-configuration.nix
@@ -1,30 +1,34 @@
 # Do not modify this file!  It was generated by ‘nixos-generate-config’
 # and may be overwritten by future invocations.  Please make changes
 # to /etc/nixos/configuration.nix instead.
-{ config, lib, pkgs, modulesPath, ... }:
-
 {
-  imports =
-    [ (modulesPath + "/installer/scan/not-detected.nix")
-    ];
+  config,
+  lib,
+  pkgs,
+  modulesPath,
+  ...
+}: {
+  imports = [
+    (modulesPath + "/installer/scan/not-detected.nix")
+  ];
 
-  boot.initrd.availableKernelModules = [ "xhci_pci" "nvme" "ahci" "usbhid" ];
-  boot.initrd.kernelModules = [ ];
-  boot.kernelModules = [ "kvm-amd" ];
-  boot.extraModulePackages = [ ];
+  boot.initrd.availableKernelModules = ["xhci_pci" "nvme" "ahci" "usbhid"];
+  boot.initrd.kernelModules = [];
+  boot.kernelModules = ["kvm-amd"];
+  boot.extraModulePackages = [];
 
-  fileSystems."/" =
-    { device = "/dev/disk/by-uuid/10c61ccc-e175-4cfd-bd6a-08a57dbdb0b5";
-      fsType = "btrfs";
-    };
+  fileSystems."/" = {
+    device = "/dev/disk/by-uuid/10c61ccc-e175-4cfd-bd6a-08a57dbdb0b5";
+    fsType = "btrfs";
+  };
 
-  fileSystems."/boot" =
-    { device = "/dev/disk/by-uuid/24E3-BA29";
-      fsType = "vfat";
-      options = [ "fmask=0077" "dmask=0077" ];
-    };
+  fileSystems."/boot" = {
+    device = "/dev/disk/by-uuid/24E3-BA29";
+    fsType = "vfat";
+    options = ["fmask=0077" "dmask=0077"];
+  };
 
-  swapDevices = [ ];
+  swapDevices = [];
 
   nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
   hardware.cpu.amd.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
diff --git a/home.nix b/home.nix
index 9a9067d..9aff559 100644
--- a/home.nix
+++ b/home.nix
@@ -1,5 +1,8 @@
-{ inputs, pkgs, ... }:
 {
+  inputs,
+  pkgs,
+  ...
+}: {
   imports = [
     ./modules/neovim/nixcats.nix
     ./modules/waybar/default.nix
@@ -36,7 +39,30 @@
       };
     };
   };
- 
+
+  services.kanshi = {
+    enable = true;
+    systemdTarget = "hyprland-session.target";
+
+    settings = [
+      {
+        # laptop screen
+        output.criteria = "eDP-1"; # XXX: TODO
+        output.mode = "1920x1080@240.00Hz";
+        output.scale = 1.0;
+        output.adaptiveSync = false; # Variable Refresh Rate
+      }
+      {
+        profile.name = "girlCore";
+        profile.outputs = [
+          {
+            criteria = "eDP-1"; # laptop screen
+            position = "0,0";
+          }
+        ];
+      }
+    ];
+  };
+
   home.stateVersion = "25.11";
 }
-
diff --git a/modules/neovim/nixcats.nix b/modules/neovim/nixcats.nix
index 2a1aa78..f9c2650 100644
--- a/modules/neovim/nixcats.nix
+++ b/modules/neovim/nixcats.nix
@@ -1,16 +1,10 @@
-{
-  inputs,
-  config,
-  pkgs,
-  ...
-}: let
+{inputs, ...}: let
   utils = inputs.nixcats.utils;
 in {
-
   imports = [
     inputs.nixcats.homeModule
   ];
-  
+
   config = {
     # this value, nixCats is the defaultPackageName you pass to mkNixosModules
     # it will be the namespace for your options.