diff --git a/modules/applications/gtk/home.nix b/modules/applications/gtk/home.nix
new file mode 100644
index 0000000..d93373f
--- /dev/null
+++ b/modules/applications/gtk/home.nix
@@ -0,0 +1,18 @@
+{ pkgs, ... }:
+{
+  gtk = {
+    enable = true;
+    theme = {
+      name = "Dracula";
+      package = pkgs.dracula-theme;
+    };
+    cursorTheme = {
+      package = pkgs.adwaita-icon-theme;
+      name = "Adwaita";
+    };
+    iconTheme = {
+      package = pkgs.papirus-icon-theme;
+      name = "Papirus-Dark";
+    };
+  };
+}
diff --git a/modules/applications/gtk/nixos.nix b/modules/applications/gtk/nixos.nix
new file mode 100644
index 0000000..e89ea5e
--- /dev/null
+++ b/modules/applications/gtk/nixos.nix
@@ -0,0 +1,5 @@
+{
+  programs.dconf.enable = true;
+  programs.seahorse.enable = true;
+  services.gnome.gnome-keyring.enable = true;
+}
diff --git a/modules/applications/niri/home.nix b/modules/applications/niri/home.nix
new file mode 100644
index 0000000..c2b145e
--- /dev/null
+++ b/modules/applications/niri/home.nix
@@ -0,0 +1,189 @@
+{ lib, pkgs, ... }:
+let
+  keybindings = import ./keybindings.nix;
+in
+{
+  programs.niri.settings = {
+    input = {
+      touchpad = {
+        natural-scroll = true;
+        scroll-factor = 4.0;
+        scroll-method = "two-finger";
+        click-method = "clickfinger";
+        drag = true;
+        drag-lock = true;
+      };
+
+      keyboard.xkb = {
+        layout = "jp";
+        options = "ctrl:nocaps";
+      };
+
+      mouse = {
+        accel-profile = "flat";
+        accel-speed = -0.1;
+      };
+
+      warp-mouse-to-focus.enable = true;
+      focus-follows-mouse = {
+        enable = true;
+        max-scroll-amount = "0%";
+      };
+    };
+
+    cursor.size = 16;
+
+    layout = {
+      focus-ring = {
+        active.color = "#bd93f9";
+        inactive.color = "#6272a4";
+      };
+      border = {
+        active.color = "#ffc87f";
+        inactive.color = "#505050";
+        urgent.color = "#9b0000";
+      };
+      shadow.color = "#0007";
+      background-color = "transparent";
+    };
+
+    binds = keybindings // {
+      "Mod+T" = {
+        action.spawn = "ghostty";
+        hotkey-overlay.title = "Open a Terminal: ghostty";
+      };
+      "Mod+D" = {
+        action.spawn = [
+          "vicinae"
+          "toggle"
+        ];
+        hotkey-overlay.title = "Run an Application: vicinae";
+      };
+      "Mod+E" = {
+        action.spawn = [
+          "nautilus"
+          "--new-window"
+        ];
+        hotkey-overlay.title = "Open File Manager: nautilus";
+      };
+      "Mod+L" = {
+        action.spawn = [
+          (lib.getExe' pkgs.systemd "loginctl")
+          "lock-session"
+        ];
+        hotkey-overlay.title = "Lock the Screen";
+      };
+      "Mod+V" = {
+        action.spawn = [
+          "vicinae"
+          "vicinae://launch/clipboard/history?toggle=true"
+        ];
+        hotkey-overlay.title = "Clipboard History";
+      };
+      "Mod+Space" = {
+        action.spawn = [
+          "ghostty"
+          "+toggle-quick-terminal"
+        ];
+        hotkey-overlay.title = "Toggle Quick Terminal: ghostty";
+      };
+
+      "Mod+Shift+Left" = {
+        action.focus-monitor-left = [ ];
+        hotkey-overlay.title = "Focus Monitor Left";
+      };
+      "Mod+Shift+Right" = {
+        action.focus-monitor-right = [ ];
+        hotkey-overlay.title = "Focus Monitor Right";
+      };
+      "Mod+Shift+Up" = {
+        action.focus-monitor-up = [ ];
+        hotkey-overlay.title = "Focus Monitor Up";
+      };
+      "Mod+Shift+Down" = {
+        action.focus-monitor-down = [ ];
+        hotkey-overlay.title = "Focus Monitor Down";
+      };
+
+      "Mod+Shift+Ctrl+Left" = {
+        action.move-window-to-monitor-left = [ ];
+        hotkey-overlay.title = "Move Window to Monitor Left";
+      };
+      "Mod+Shift+Ctrl+Right" = {
+        action.move-window-to-monitor-right = [ ];
+        hotkey-overlay.title = "Move Window to Monitor Right";
+      };
+      "Mod+Shift+Ctrl+Up" = {
+        action.move-window-to-monitor-up = [ ];
+        hotkey-overlay.title = "Move Window to Monitor Up";
+      };
+      "Mod+Shift+Ctrl+Down" = {
+        action.move-window-to-monitor-down = [ ];
+        hotkey-overlay.title = "Move Window to Monitor Down";
+      };
+
+      "XF86AudioRaiseVolume".action.spawn = [
+        "noctalia"
+        "msg"
+        "volume-up"
+      ];
+      "XF86AudioLowerVolume".action.spawn = [
+        "noctalia"
+        "msg"
+        "volume-down"
+      ];
+      "XF86AudioMute".action.spawn = [
+        "noctalia"
+        "msg"
+        "volume-mute"
+      ];
+      "XF86AudioMicMute".action.spawn = [
+        "noctalia"
+        "msg"
+        "mic-mute"
+      ];
+      "XF86MonBrightnessUp".action.spawn = [
+        "noctalia"
+        "msg"
+        "brightness-up"
+      ];
+      "XF86MonBrightnessDown".action.spawn = [
+        "noctalia"
+        "msg"
+        "brightness-down"
+      ];
+      "XF86Favorites".action.spawn = [
+        "noctalia"
+        "msg"
+        "caffeine-toggle"
+      ];
+    };
+
+    window-rules = [
+      {
+        geometry-corner-radius = {
+          top-left = 20.0;
+          top-right = 20.0;
+          bottom-left = 20.0;
+          bottom-right = 20.0;
+        };
+        clip-to-geometry = true;
+      }
+      {
+        matches = [ { app-id = "^dev\\.noctalia\\.Noctalia$"; } ];
+        open-floating = true;
+        default-column-width.fixed = 1080;
+        default-window-height.fixed = 920;
+      }
+    ];
+
+    layer-rules = [
+      {
+        matches = [ { namespace = "^noctalia-wallpaper"; } ];
+        place-within-backdrop = true;
+      }
+    ];
+
+    overview.workspace-shadow.enable = false;
+  };
+}
diff --git a/modules/applications/niri/keybindings.nix b/modules/applications/niri/keybindings.nix
new file mode 100644
index 0000000..c74378e
--- /dev/null
+++ b/modules/applications/niri/keybindings.nix
@@ -0,0 +1,160 @@
+{
+  "Mod+Shift+Slash".action.show-hotkey-overlay = { };
+
+  "XF86AudioRaiseVolume" = {
+    allow-when-locked = true;
+    action.spawn = [
+      "wpctl"
+      "set-volume"
+      "@DEFAULT_AUDIO_SINK@"
+      "0.1+"
+    ];
+  };
+  "XF86AudioLowerVolume" = {
+    allow-when-locked = true;
+    action.spawn = [
+      "wpctl"
+      "set-volume"
+      "@DEFAULT_AUDIO_SINK@"
+      "0.1-"
+    ];
+  };
+  "XF86AudioMute" = {
+    allow-when-locked = true;
+    action.spawn = [
+      "wpctl"
+      "set-mute"
+      "@DEFAULT_AUDIO_SINK@"
+      "toggle"
+    ];
+  };
+  "XF86AudioMicMute" = {
+    allow-when-locked = true;
+    action.spawn = [
+      "wpctl"
+      "set-mute"
+      "@DEFAULT_AUDIO_SOURCE@"
+      "toggle"
+    ];
+  };
+
+  "Mod+Q".action.close-window = { };
+
+  "Mod+Left".action.focus-column-left = { };
+  "Mod+Down".action.focus-window-down = { };
+  "Mod+Up".action.focus-window-up = { };
+  "Mod+Right".action.focus-column-right = { };
+  "Mod+H".action.focus-column-left = { };
+  "Mod+J".action.focus-window-down = { };
+  "Mod+K".action.focus-window-up = { };
+  "Mod+L".action.focus-column-right = { };
+
+  "Mod+Ctrl+Left".action.move-column-left = { };
+  "Mod+Ctrl+Down".action.move-window-down = { };
+  "Mod+Ctrl+Up".action.move-window-up = { };
+  "Mod+Ctrl+Right".action.move-column-right = { };
+  "Mod+Ctrl+H".action.move-column-left = { };
+  "Mod+Ctrl+J".action.move-window-down = { };
+  "Mod+Ctrl+K".action.move-window-up = { };
+  "Mod+Ctrl+L".action.move-column-right = { };
+
+  "Mod+Home".action.focus-column-first = { };
+  "Mod+End".action.focus-column-last = { };
+  "Mod+Ctrl+Home".action.move-column-to-first = { };
+  "Mod+Ctrl+End".action.move-column-to-last = { };
+
+  "Mod+Shift+Left".action.focus-monitor-left = { };
+  "Mod+Shift+Down".action.focus-monitor-down = { };
+  "Mod+Shift+Up".action.focus-monitor-up = { };
+  "Mod+Shift+Right".action.focus-monitor-right = { };
+  "Mod+Shift+H".action.focus-monitor-left = { };
+  "Mod+Shift+J".action.focus-monitor-down = { };
+  "Mod+Shift+K".action.focus-monitor-up = { };
+  "Mod+Shift+L".action.focus-monitor-right = { };
+
+  "Mod+Shift+Ctrl+Left".action.move-column-to-monitor-left = { };
+  "Mod+Shift+Ctrl+Down".action.move-column-to-monitor-down = { };
+  "Mod+Shift+Ctrl+Up".action.move-column-to-monitor-up = { };
+  "Mod+Shift+Ctrl+Right".action.move-column-to-monitor-right = { };
+  "Mod+Shift+Ctrl+H".action.move-column-to-monitor-left = { };
+  "Mod+Shift+Ctrl+J".action.move-column-to-monitor-down = { };
+  "Mod+Shift+Ctrl+K".action.move-column-to-monitor-up = { };
+  "Mod+Shift+Ctrl+L".action.move-column-to-monitor-right = { };
+
+  "Mod+Page_Down".action.focus-workspace-down = { };
+  "Mod+Page_Up".action.focus-workspace-up = { };
+  "Mod+U".action.focus-workspace-down = { };
+  "Mod+I".action.focus-workspace-up = { };
+  "Mod+Ctrl+Page_Down".action.move-column-to-workspace-down = { };
+  "Mod+Ctrl+Page_Up".action.move-column-to-workspace-up = { };
+  "Mod+Ctrl+U".action.move-column-to-workspace-down = { };
+  "Mod+Ctrl+I".action.move-column-to-workspace-up = { };
+
+  "Mod+Shift+Page_Down".action.move-workspace-down = { };
+  "Mod+Shift+Page_Up".action.move-workspace-up = { };
+  "Mod+Shift+U".action.move-workspace-down = { };
+  "Mod+Shift+I".action.move-workspace-up = { };
+
+  "Mod+WheelScrollDown" = {
+    cooldown-ms = 150;
+    action.focus-workspace-down = { };
+  };
+  "Mod+WheelScrollUp" = {
+    cooldown-ms = 150;
+    action.focus-workspace-up = { };
+  };
+  "Mod+Ctrl+WheelScrollDown" = {
+    cooldown-ms = 150;
+    action.move-column-to-workspace-down = { };
+  };
+  "Mod+Ctrl+WheelScrollUp" = {
+    cooldown-ms = 150;
+    action.move-column-to-workspace-up = { };
+  };
+
+  "Mod+WheelScrollRight".action.focus-column-right = { };
+  "Mod+WheelScrollLeft".action.focus-column-left = { };
+  "Mod+Ctrl+WheelScrollRight".action.move-column-right = { };
+  "Mod+Ctrl+WheelScrollLeft".action.move-column-left = { };
+  "Mod+Shift+WheelScrollDown".action.focus-column-right = { };
+  "Mod+Shift+WheelScrollUp".action.focus-column-left = { };
+  "Mod+Ctrl+Shift+WheelScrollDown".action.move-column-right = { };
+  "Mod+Ctrl+Shift+WheelScrollUp".action.move-column-left = { };
+
+  "Mod+1".action.focus-workspace = 1;
+  "Mod+2".action.focus-workspace = 2;
+  "Mod+3".action.focus-workspace = 3;
+  "Mod+4".action.focus-workspace = 4;
+  "Mod+5".action.focus-workspace = 5;
+  "Mod+6".action.focus-workspace = 6;
+  "Mod+7".action.focus-workspace = 7;
+  "Mod+8".action.focus-workspace = 8;
+  "Mod+9".action.focus-workspace = 9;
+  "Mod+Ctrl+1".action.move-column-to-workspace = 1;
+  "Mod+Ctrl+2".action.move-column-to-workspace = 2;
+  "Mod+Ctrl+3".action.move-column-to-workspace = 3;
+  "Mod+Ctrl+4".action.move-column-to-workspace = 4;
+  "Mod+Ctrl+5".action.move-column-to-workspace = 5;
+  "Mod+Ctrl+6".action.move-column-to-workspace = 6;
+  "Mod+Ctrl+7".action.move-column-to-workspace = 7;
+  "Mod+Ctrl+8".action.move-column-to-workspace = 8;
+  "Mod+Ctrl+9".action.move-column-to-workspace = 9;
+
+  "Mod+Comma".action.consume-window-into-column = { };
+  "Mod+Period".action.expel-window-from-column = { };
+  "Mod+R".action.switch-preset-column-width = { };
+  "Mod+Shift+R".action.reset-window-height = { };
+  "Mod+F".action.maximize-column = { };
+  "Mod+Shift+F".action.fullscreen-window = { };
+  "Mod+C".action.center-column = { };
+  "Mod+Minus".action.set-column-width = "-10%";
+  "Mod+Equal".action.set-column-width = "+10%";
+  "Mod+Shift+Minus".action.set-window-height = "-10%";
+  "Mod+Shift+Equal".action.set-window-height = "+10%";
+
+  "Print".action.screenshot = { };
+  "Ctrl+Print".action.screenshot-screen = { };
+  "Alt+Print".action.screenshot-window = { };
+  "Mod+Shift+E".action.quit = { };
+  "Mod+Shift+P".action.power-off-monitors = { };
+}
diff --git a/modules/applications/niri/meta.nix b/modules/applications/niri/meta.nix
new file mode 100644
index 0000000..dbfd1f1
--- /dev/null
+++ b/modules/applications/niri/meta.nix
@@ -0,0 +1,6 @@
+{ inputs, ... }:
+{
+  description = "niri Wayland compositor";
+
+  imports.nixos = [ inputs.niri-flake.nixosModules.niri ];
+}
diff --git a/modules/applications/niri/nixos.nix b/modules/applications/niri/nixos.nix
new file mode 100644
index 0000000..c39f911
--- /dev/null
+++ b/modules/applications/niri/nixos.nix
@@ -0,0 +1,9 @@
+{ pkgs, ... }:
+{
+  programs.niri.enable = true;
+
+  environment.systemPackages = with pkgs; [
+    wdisplays # Wayland display configuration GUI
+    wlr-randr # Wayland output management CLI
+  ];
+}
diff --git a/modules/applications/noctalia/home.nix b/modules/applications/noctalia/home.nix
new file mode 100644
index 0000000..3f79fdb
--- /dev/null
+++ b/modules/applications/noctalia/home.nix
@@ -0,0 +1,168 @@
+{ pkgs, ... }:
+let
+  wallpapers = pkgs.fetchFromGitHub {
+    owner = "moons-14";
+    repo = "wallpapers";
+    rev = "cc3256f4aaf2c8e7d16fb000b1ee251af54085db";
+    hash = "sha256-emQ/FqKqMq3YI5bLx8gBZg/ZE72OG9Ilh71ggq78WdQ=";
+  };
+in
+{
+  home.packages = [ pkgs.networkmanagerapplet ];
+
+  home.file = {
+    ".face".source = ../../../images/avatar.jpg;
+    ".wallpapers" = {
+      source = wallpapers;
+      recursive = true;
+    };
+  };
+
+  programs.noctalia = {
+    enable = true;
+    systemd.enable = true;
+
+    settings = {
+      theme = {
+        mode = "auto";
+        source = "wallpaper";
+        templates = {
+          enable_builtin_templates = false;
+          enable_community_templates = false;
+        };
+      };
+
+      desktop_widgets.enabled = false;
+      lockscreen = {
+        enabled = false;
+        fingerprint = false;
+      };
+
+      bar.main = {
+        margin_ends = 15;
+        position = "top";
+        start = [
+          "network"
+          "bluetooth"
+          "network-connection"
+          "spacer"
+          "cpu"
+          "cpu-graph"
+          "ram"
+        ];
+        center = [ "workspaces" ];
+        end = [
+          "media"
+          "spacer"
+          "notifications"
+          "tray"
+          "spacer"
+          "battery"
+          "input-volume"
+          "output-volume"
+          "privacy"
+          "brightness"
+          "clock"
+          "control-center"
+        ];
+      };
+
+      widget = {
+        cpu = {
+          type = "sysmon";
+          stat = "cpu_usage";
+        };
+        cpu-graph = {
+          type = "sysmon";
+          stat = "cpu_usage";
+          display = "graph";
+          show_label = false;
+        };
+        ram = {
+          type = "sysmon";
+          stat = "ram_used";
+        };
+        media = {
+          type = "media";
+          hide_when_no_media = true;
+          title_scroll = "always";
+        };
+        battery = {
+          type = "battery";
+          display_mode = "graphic";
+          warning_threshold = 30;
+        };
+        brightness = {
+          type = "brightness";
+          show_label = false;
+        };
+        input-volume = {
+          type = "volume";
+          device = "input";
+        };
+        output-volume = {
+          type = "volume";
+          device = "output";
+        };
+        clock = {
+          type = "clock";
+          format = "{:%Y/%m/%d %H:%M}";
+          vertical_format = "{:%Y/%m/%d\n%H:%M}";
+          tooltip_format = "{:%Y/%m/%d %H:%M (%a)}";
+        };
+        network-connection = {
+          type = "custom_button";
+          glyph = "access-point";
+          command = "nm-connection-editor";
+        };
+        tray = {
+          type = "tray";
+          pinned = [ "org.fcitx.Fcitx5" ];
+        };
+      };
+
+      shell = {
+        avatar_path = "~/.face";
+        corner_radius_scale = 0.2;
+        clipboard_enabled = false;
+        launch_apps_as_systemd_services = true;
+      };
+
+      wallpaper = {
+        enabled = true;
+        directory = "~/.wallpapers";
+        fill_mode = "crop";
+        automation = {
+          enabled = true;
+          order = "random";
+          interval_seconds = 60;
+        };
+        default.path = "~/.wallpapers/1.jpg";
+      };
+
+      dock = {
+        enabled = true;
+        position = "left";
+        auto_hide = true;
+        show_dots = true;
+        background_opacity = 0.8;
+        active_monitor_only = true;
+        reserve_space = false;
+        pinned = [
+          "com.mitchellh.ghostty"
+          "google-chrome"
+          "code"
+        ];
+      };
+
+      control_center.shortcuts = [
+        { type = "wifi"; }
+        { type = "bluetooth"; }
+        { type = "screen_recorder"; }
+        { type = "wallpaper"; }
+        { type = "notifications"; }
+        { type = "nightlight"; }
+      ];
+    };
+  };
+}
diff --git a/modules/applications/noctalia/meta.nix b/modules/applications/noctalia/meta.nix
new file mode 100644
index 0000000..333fc78
--- /dev/null
+++ b/modules/applications/noctalia/meta.nix
@@ -0,0 +1,9 @@
+{ inputs, ... }:
+{
+  description = "Noctalia Wayland desktop shell";
+
+  imports = {
+    nixos = [ inputs.noctalia.nixosModules.default ];
+    home = [ inputs.noctalia.homeModules.default ];
+  };
+}
diff --git a/modules/applications/noctalia/nixos.nix b/modules/applications/noctalia/nixos.nix
new file mode 100644
index 0000000..be57970
--- /dev/null
+++ b/modules/applications/noctalia/nixos.nix
@@ -0,0 +1,6 @@
+{
+  programs.noctalia = {
+    enable = true;
+    recommendedServices.enable = true;
+  };
+}
diff --git a/modules/applications/ssh/home.nix b/modules/applications/ssh/home.nix
new file mode 100644
index 0000000..e2c37ee
--- /dev/null
+++ b/modules/applications/ssh/home.nix
@@ -0,0 +1,37 @@
+{ lib, pkgs, ... }:
+lib.mkMerge [
+  {
+    home.packages = [ pkgs.openssh ];
+
+    programs.ssh = {
+      enable = true;
+      enableDefaultConfig = false;
+
+      settings = {
+        "github.com" = {
+          HostName = "github.com";
+          User = "git";
+          AddKeysToAgent = "no";
+        };
+        "*.sfc.wide.ad.jp" = {
+          identityFile = "~/.ssh/id_ed25519_sk_rk";
+          identitiesOnly = true;
+        };
+        "*" = {
+          AddKeysToAgent = "no";
+          SetEnv.TERM = "xterm-256color";
+        };
+      };
+
+      extraConfig = ''
+        Match exec "test -S %d/.1password/agent.sock"
+          IdentityAgent %d/.1password/agent.sock
+      '';
+    };
+  }
+
+  (lib.mkIf pkgs.stdenv.hostPlatform.isLinux {
+    systemd.user.sockets.gcr-ssh-agent.Install.WantedBy = lib.mkForce [ ];
+    services.ssh-agent.enable = lib.mkForce false;
+  })
+]
diff --git a/modules/applications/ssh/nixos.nix b/modules/applications/ssh/nixos.nix
new file mode 100644
index 0000000..d43087b
--- /dev/null
+++ b/modules/applications/ssh/nixos.nix
@@ -0,0 +1,4 @@
+{
+  programs.ssh.startAgent = false;
+  services.gnome.gcr-ssh-agent.enable = false;
+}
diff --git a/modules/services/swaylock/home.nix b/modules/services/swaylock/home.nix
new file mode 100644
index 0000000..4760976
--- /dev/null
+++ b/modules/services/swaylock/home.nix
@@ -0,0 +1,23 @@
+{ lib, pkgs, ... }:
+{
+  home.packages = [ pkgs.swaylock ];
+
+  systemd.user.services.swaylock = {
+    Unit = {
+      Description = "Screen locker for Wayland";
+      Documentation = [ "man:swaylock(1)" ];
+      OnSuccess = [ "unlock.target" ];
+      PartOf = [ "lock.target" ];
+      Before = [ "lock.target" ];
+    };
+
+    Service = {
+      Type = "forking";
+      ExecStart = "${lib.getExe pkgs.swaylock} -f -i %h/.wallpapers/28.jpg";
+      Restart = "on-failure";
+      RestartSec = 0;
+    };
+
+    Install.WantedBy = [ "lock.target" ];
+  };
+}
diff --git a/modules/services/swaylock/nixos.nix b/modules/services/swaylock/nixos.nix
new file mode 100644
index 0000000..89b942c
--- /dev/null
+++ b/modules/services/swaylock/nixos.nix
@@ -0,0 +1,10 @@
+{ config, ... }:
+{
+  services.systemd-lock-handler.enable = true;
+
+  security.pam.services.swaylock = {
+    fprintAuth = true;
+
+    rules.auth.fprintd.order = config.security.pam.services.swaylock.rules.auth.unix.order + 50;
+  };
+}