diff --git a/bash/tools.bash b/bash/tools.bash
index da78446..6e59e2c 100644
--- a/bash/tools.bash
+++ b/bash/tools.bash
@@ -8,8 +8,8 @@ if ! shopt -oq posix; then
 fi
 
 # ble.sh
-[[ -r "$HOME/.local/share/blesh/out/ble.sh" ]] &&
-    source "$HOME/.local/share/blesh/out/ble.sh"
+[[ -r "/etc/blesh/ble.sh" ]] &&
+  source /etc/blesh/ble.sh
 
 # NVM
 export NVM_DIR="$HOME/.nvm"
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..75d8502
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,44 @@
+{
+  "nodes": {
+    "codex-nixpkgs": {
+      "locked": {
+        "lastModified": 1790985011,
+        "narHash": "sha256-VgqQfUblvgQomOUkyTCy5YE1mjRn8VBS8g984p9Ft4s=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "4379d026b3ff838d5a8655451280c4fdf2e3e96a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "master",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1790920529,
+        "narHash": "sha256-nQyFkMR78WP6PiXKkDW2SjqzLf/spQqjRuxRGSbcV8k=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "774debe7a0d1b496e35677ad955a1011c6ff74f3",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-26.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "codex-nixpkgs": "codex-nixpkgs",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..49165a9
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,18 @@
+{
+  description = "NixOS system and personal dotfiles";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-26.05";
+    codex-nixpkgs.url = "github:NixOS/nixpkgs/master";
+  };
+
+  outputs = { nixpkgs, codex-nixpkgs, ... }: {
+    nixosConfigurations.nixos = nixpkgs.lib.nixosSystem {
+      system = "x86_64-linux";
+      modules = [ ./nixos/hosts/nixos ];
+      specialArgs = {
+        codexPkgs = codex-nixpkgs.legacyPackages.x86_64-linux;
+      };
+    };
+  };
+}
diff --git a/nixos/hosts/nixos/default.nix b/nixos/hosts/nixos/default.nix
new file mode 100644
index 0000000..d1db620
--- /dev/null
+++ b/nixos/hosts/nixos/default.nix
@@ -0,0 +1,17 @@
+{ ... }:
+
+{
+  imports = [
+    ./hardware-configuration.nix
+    ../../modules/desktop.nix
+    ../../modules/hardware.nix
+    ../../modules/packages
+    ../../modules/system.nix
+    ../../modules/users.nix
+  ];
+
+  networking.hostName = "nixos";
+
+  # Keep this at the version used during the initial installation.
+  system.stateVersion = "26.05";
+}
diff --git a/nixos/hosts/nixos/hardware-configuration.nix b/nixos/hosts/nixos/hardware-configuration.nix
new file mode 100644
index 0000000..9b1e5e4
--- /dev/null
+++ b/nixos/hosts/nixos/hardware-configuration.nix
@@ -0,0 +1,37 @@
+# Generated by nixos-generate-config. Keep machine-specific settings here.
+{ config, lib, modulesPath, ... }:
+
+{
+  imports = [
+    (modulesPath + "/installer/scan/not-detected.nix")
+  ];
+
+  boot.initrd.availableKernelModules = [
+    "ahci"
+    "nvme"
+    "xhci_pci"
+    "usb_storage"
+    "usbhid"
+    "sd_mod"
+  ];
+  boot.initrd.kernelModules = [ ];
+  boot.kernelModules = [ "kvm-amd" ];
+  boot.extraModulePackages = [ ];
+
+  fileSystems."/" = {
+    device = "/dev/disk/by-uuid/bc9b799b-3c14-419b-b3f5-88ff212bb1f4";
+    fsType = "ext4";
+  };
+
+  fileSystems."/boot" = {
+    device = "/dev/disk/by-uuid/D846-0839";
+    fsType = "vfat";
+    options = [ "fmask=0022" "dmask=0022" ];
+  };
+
+  swapDevices = [ ];
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+  hardware.cpu.amd.updateMicrocode =
+    lib.mkDefault config.hardware.enableRedistributableFirmware;
+}
diff --git a/nixos/modules/desktop.nix b/nixos/modules/desktop.nix
new file mode 100644
index 0000000..4059405
--- /dev/null
+++ b/nixos/modules/desktop.nix
@@ -0,0 +1,18 @@
+{ pkgs, ... }:
+
+{
+  programs.hyprland = {
+    enable = true;
+    xwayland.enable = true;
+  };
+
+  services.displayManager.sddm = {
+    enable = true;
+    wayland.enable = true;
+  };
+
+  services.displayManager.sessionPackages = [ pkgs.hyprland ];
+
+  programs.throne.enable = true;
+  programs.throne.tunMode.enable = true;
+}
diff --git a/nixos/modules/hardware.nix b/nixos/modules/hardware.nix
new file mode 100644
index 0000000..ae4cc37
--- /dev/null
+++ b/nixos/modules/hardware.nix
@@ -0,0 +1,23 @@
+{ ... }:
+
+{
+  services.xserver.videoDrivers = [ "nvidia" ];
+
+  hardware.nvidia = {
+    modesetting.enable = true;
+    open = true;
+    nvidiaSettings = true;
+  };
+
+  hardware.graphics = {
+    enable = true;
+    enable32Bit = true;
+  };
+
+  services.pipewire = {
+    enable = true;
+    pulse.enable = true;
+    alsa.enable = true;
+    alsa.support32Bit = true;
+  };
+}
diff --git a/nixos/modules/packages/default.nix b/nixos/modules/packages/default.nix
new file mode 100644
index 0000000..02426a8
--- /dev/null
+++ b/nixos/modules/packages/default.nix
@@ -0,0 +1,10 @@
+{ ... }:
+
+{
+  imports = [
+    ./desktop.nix
+    ./development.nix
+    ./shell.nix
+    ./utilities.nix
+  ];
+}
diff --git a/nixos/modules/packages/desktop.nix b/nixos/modules/packages/desktop.nix
new file mode 100644
index 0000000..83e8675
--- /dev/null
+++ b/nixos/modules/packages/desktop.nix
@@ -0,0 +1,16 @@
+{ pkgs, ... }:
+
+{
+  environment.systemPackages = with pkgs; [
+    adwaita-icon-theme
+    firefox
+    grim
+    hyprpaper
+    kitty
+    mako
+    slurp
+    waybar
+    wl-clipboard
+    wofi
+  ];
+}
diff --git a/nixos/modules/packages/development.nix b/nixos/modules/packages/development.nix
new file mode 100644
index 0000000..7a59aa0
--- /dev/null
+++ b/nixos/modules/packages/development.nix
@@ -0,0 +1,29 @@
+{ codexPkgs, pkgs, ... }:
+
+{
+  environment.systemPackages = with pkgs; [
+    clang
+    cmake
+    codexPkgs.codex
+    gcc
+    git
+    gitui
+    meson
+    neovim
+    ninja
+    tree-sitter
+    vim
+  ];
+
+  systemd.user.services.codex-background-server = {
+    description = "Codex background app server";
+    wantedBy = [ "default.target" ];
+    unitConfig.ConditionUser = "hhhh";
+    serviceConfig = {
+      ExecStart = "/run/current-system/sw/bin/codex app-server --listen unix://";
+      WorkingDirectory = "%h";
+      Restart = "on-failure";
+      RestartSec = 3;
+    };
+  };
+}
diff --git a/nixos/modules/packages/shell.nix b/nixos/modules/packages/shell.nix
new file mode 100644
index 0000000..adcd429
--- /dev/null
+++ b/nixos/modules/packages/shell.nix
@@ -0,0 +1,17 @@
+{ pkgs, ... }:
+
+{
+  environment.systemPackages = with pkgs; [
+    atuin
+    blesh
+    direnv
+    eza
+    fd
+    fzf
+    ripgrep
+    starship
+    zoxide
+  ];
+
+  environment.etc."blesh/ble.sh".source = "${pkgs.blesh}/share/blesh/ble.sh";
+}
diff --git a/nixos/modules/packages/utilities.nix b/nixos/modules/packages/utilities.nix
new file mode 100644
index 0000000..2b02441
--- /dev/null
+++ b/nixos/modules/packages/utilities.nix
@@ -0,0 +1,11 @@
+{ pkgs, ... }:
+
+{
+  environment.systemPackages = with pkgs; [
+    curl
+    tree
+    unzip
+    wget
+    zip
+  ];
+}
diff --git a/nixos/modules/system.nix b/nixos/modules/system.nix
new file mode 100644
index 0000000..86b0258
--- /dev/null
+++ b/nixos/modules/system.nix
@@ -0,0 +1,18 @@
+{ ... }:
+
+{
+  nix.settings.experimental-features = [
+    "nix-command"
+    "flakes"
+  ];
+
+  nixpkgs.config.allowUnfree = true;
+
+  boot.loader.systemd-boot.enable = true;
+  boot.loader.efi.canTouchEfiVariables = true;
+
+  networking.networkmanager.enable = true;
+
+  security.polkit.enable = true;
+  services.openssh.enable = true;
+}
diff --git a/nixos/modules/users.nix b/nixos/modules/users.nix
new file mode 100644
index 0000000..22b3be7
--- /dev/null
+++ b/nixos/modules/users.nix
@@ -0,0 +1,12 @@
+{ ... }:
+
+{
+  users.users.hhhh = {
+    isNormalUser = true;
+    description = "main";
+    extraGroups = [
+      "networkmanager"
+      "wheel"
+    ];
+  };
+}