diff --git a/hosts/default.nix b/hosts/default.nix
new file mode 100644
index 0000000..7815d7c
--- /dev/null
+++ b/hosts/default.nix
@@ -0,0 +1,13 @@
+{
+  x1g9 = {
+    system = "x86_64-linux";
+    user = "moons";
+    path = ./x1g9;
+
+    profiles = [
+      "base"
+      "interface.cli-minimal"
+      "platform.laptop"
+    ];
+  };
+}
diff --git a/hosts/x1g9/hardware.nix b/hosts/x1g9/hardware.nix
new file mode 100644
index 0000000..ffcd441
--- /dev/null
+++ b/hosts/x1g9/hardware.nix
@@ -0,0 +1 @@
+{ }
diff --git a/hosts/x1g9/nixos.nix b/hosts/x1g9/nixos.nix
new file mode 100644
index 0000000..0b31a81
--- /dev/null
+++ b/hosts/x1g9/nixos.nix
@@ -0,0 +1,7 @@
+{
+  imports = [
+    ./hardware.nix
+  ];
+
+  system.stateVersion = "26.05";
+}
diff --git a/modules/applications/claude/home.nix b/modules/applications/claude/home.nix
new file mode 100644
index 0000000..9aa9a1a
--- /dev/null
+++ b/modules/applications/claude/home.nix
@@ -0,0 +1,18 @@
+{
+  inputs,
+  pkgs,
+  ...
+}:
+{
+  home.packages = [
+    inputs.llm-agents.packages.${pkgs.stdenv.hostPlatform.system}.claude-code
+  ];
+
+  home.file.".claude/settings.json".text = builtins.toJSON {
+    statusLine = {
+      type = "command";
+      command = "bun x ccusage statusline --no-offline";
+      padding = 0;
+    };
+  };
+}
diff --git a/modules/applications/fcitx5/config b/modules/applications/fcitx5/config
new file mode 100644
index 0000000..a11fae8
--- /dev/null
+++ b/modules/applications/fcitx5/config
@@ -0,0 +1,69 @@
+[Hotkey]
+# トリガーキーを押すたびに切り替える
+EnumerateWithTriggerKeys=False
+# 一時的に第1入力メソッドに切り替える
+AltTriggerKeys=
+# 切り替え時は第1入力メソッドをスキップする
+EnumerateSkipFirst=False
+# Time limit in milliseconds for triggering modifier key shortcuts
+ModifierOnlyKeyTimeout=250
+
+[Hotkey/TriggerKeys]
+1=Zenkaku_Hankaku
+
+[Hotkey/ActivateKeys]
+0=Henkan
+
+[Hotkey/DeactivateKeys]
+0=Muhenkan
+
+[Hotkey/PrevPage]
+0=Up
+
+[Hotkey/NextPage]
+0=Down
+
+[Hotkey/PrevCandidate]
+0=Shift+Tab
+
+[Hotkey/NextCandidate]
+0=Tab
+
+[Hotkey/TogglePreedit]
+0=Control+Alt+P
+
+[Behavior]
+# デフォルトで有効にする
+ActiveByDefault=False
+# フォーカス時に状態をリセット
+resetStateWhenFocusIn=No
+# 入力状態を共有する
+ShareInputState=No
+# アプリケーションにプリエディットを表示する
+PreeditEnabledByDefault=True
+# 入力メソッドを切り替える際に入力メソッドの情報を表示する
+ShowInputMethodInformation=True
+# フォーカスを変更する際に入力メソッドの情報を表示する
+showInputMethodInformationWhenFocusIn=False
+# 入力メソッドの情報をコンパクトに表示する
+CompactInputMethodInformation=True
+# 第1入力メソッドの情報を表示する
+ShowFirstInputMethodInformation=True
+# デフォルトのページサイズ
+DefaultPageSize=5
+# XKB オプションより優先する
+OverrideXkbOption=False
+# カスタム XKB オプション
+CustomXkbOption=
+# Force Enabled Addons
+EnabledAddons=
+# Force Disabled Addons
+DisabledAddons=
+# Preload input method to be used by default
+PreloadInputMethod=True
+# パスワード欄に入力メソッドを許可する
+AllowInputMethodForPassword=False
+# パスワード入力時にプリエディットテキストを表示する
+ShowPreeditForPassword=False
+# ユーザーデータを保存する間隔（分）
+AutoSavePeriod=30
diff --git a/modules/profiles/base/meta.nix b/modules/profiles/base/meta.nix
new file mode 100644
index 0000000..1fc1238
--- /dev/null
+++ b/modules/profiles/base/meta.nix
@@ -0,0 +1,9 @@
+{
+  description = "base system configuration";
+
+  includes = [
+    "systems.locale"
+    "systems.networking"
+    "systems.nix"
+  ];
+}
diff --git a/modules/profiles/interface/cli-minimal/meta.nix b/modules/profiles/interface/cli-minimal/meta.nix
new file mode 100644
index 0000000..00efff4
--- /dev/null
+++ b/modules/profiles/interface/cli-minimal/meta.nix
@@ -0,0 +1,7 @@
+{
+  description = "minimal command-line environment";
+
+  includes = [
+    "applications.btop"
+  ];
+}
diff --git a/modules/profiles/platform/laptop/meta.nix b/modules/profiles/platform/laptop/meta.nix
new file mode 100644
index 0000000..57411c9
--- /dev/null
+++ b/modules/profiles/platform/laptop/meta.nix
@@ -0,0 +1,7 @@
+{
+  description = "laptop platform configuration";
+
+  includes = [
+    "systems.boot.uefi"
+  ];
+}
diff --git a/modules/systems/boot/uefi/nixos.nix b/modules/systems/boot/uefi/nixos.nix
new file mode 100644
index 0000000..8292620
--- /dev/null
+++ b/modules/systems/boot/uefi/nixos.nix
@@ -0,0 +1,8 @@
+{ lib, ... }:
+{
+  boot.loader = {
+    systemd-boot.enable = lib.mkDefault true;
+    systemd-boot.configurationLimit = lib.mkDefault 8;
+    efi.canTouchEfiVariables = lib.mkDefault true;
+  };
+}
diff --git a/modules/systems/locale/nixos.nix b/modules/systems/locale/nixos.nix
new file mode 100644
index 0000000..ba648bb
--- /dev/null
+++ b/modules/systems/locale/nixos.nix
@@ -0,0 +1,20 @@
+{
+  time.timeZone = "Asia/Tokyo";
+
+  i18n = {
+    defaultLocale = "ja_JP.UTF-8";
+    extraLocaleSettings = {
+      LC_ADDRESS = "ja_JP.UTF-8";
+      LC_IDENTIFICATION = "ja_JP.UTF-8";
+      LC_MEASUREMENT = "ja_JP.UTF-8";
+      LC_MONETARY = "ja_JP.UTF-8";
+      LC_NAME = "ja_JP.UTF-8";
+      LC_NUMERIC = "ja_JP.UTF-8";
+      LC_PAPER = "ja_JP.UTF-8";
+      LC_TELEPHONE = "ja_JP.UTF-8";
+      LC_TIME = "ja_JP.UTF-8";
+    };
+  };
+
+  console.keyMap = "jp106";
+}
diff --git a/modules/systems/networking/nixos.nix b/modules/systems/networking/nixos.nix
new file mode 100644
index 0000000..f29d881
--- /dev/null
+++ b/modules/systems/networking/nixos.nix
@@ -0,0 +1,3 @@
+{
+  networking.networkmanager.enable = true;
+}
diff --git a/modules/systems/nix/common.nix b/modules/systems/nix/common.nix
new file mode 100644
index 0000000..d74f5a2
--- /dev/null
+++ b/modules/systems/nix/common.nix
@@ -0,0 +1,6 @@
+{
+  nix.settings.experimental-features = [
+    "nix-command"
+    "flakes"
+  ];
+}
diff --git a/modules/users/moons/home.nix b/modules/users/moons/home.nix
new file mode 100644
index 0000000..cd1cb30
--- /dev/null
+++ b/modules/users/moons/home.nix
@@ -0,0 +1,10 @@
+{ primaryUser, ... }:
+{
+  home = {
+    username = primaryUser;
+    homeDirectory = "/home/${primaryUser}";
+    stateVersion = "26.05";
+  };
+
+  programs.home-manager.enable = true;
+}
diff --git a/modules/users/moons/nixos.nix b/modules/users/moons/nixos.nix
new file mode 100644
index 0000000..2f49e94
--- /dev/null
+++ b/modules/users/moons/nixos.nix
@@ -0,0 +1,19 @@
+{ primaryUser, ... }:
+{
+  users.users.${primaryUser} = {
+    isNormalUser = true;
+    description = "moons";
+    extraGroups = [
+      "networkmanager"
+      "wheel"
+    ];
+  };
+
+  nix.settings = {
+    allowed-users = [ primaryUser ];
+    trusted-users = [
+      "root"
+      primaryUser
+    ];
+  };
+}