diff --git a/config/nvim/lua/config/fzf_reload.lua b/config/nvim/lua/config/fzf_reload.lua
new file mode 100644
index 0000000..0023717
--- /dev/null
+++ b/config/nvim/lua/config/fzf_reload.lua
@@ -0,0 +1,24 @@
+local M = {}
+M.opts = nil
+
+function M.setup(opts) M.opts = vim.deepcopy(opts or {}) end
+
+function M.reload()
+  local path = vim.env.FZF_DEFAULT_OPTS_FILE or vim.fn.expand "~/.config/fzf/themes/theme"
+  if vim.fn.filereadable(path) == 0 then return end
+
+  local lines = vim.fn.readfile(path)
+  if not lines or #lines == 0 or not M.opts then return end
+
+  local colors = {}
+  for color_spec in table.concat(lines, "\n"):gmatch "%-%-color=([^%s]+)" do
+    for key, value in color_spec:gmatch "([^:,]+):([^,]+)" do
+      colors[key] = value
+    end
+  end
+
+  M.opts.fzf_colors = colors
+  require("fzf-lua").setup(M.opts)
+end
+
+return M
diff --git a/config/nvim/lua/plugins/fzf.lua b/config/nvim/lua/plugins/fzf.lua
index d95a03f..c4a6635 100644
--- a/config/nvim/lua/plugins/fzf.lua
+++ b/config/nvim/lua/plugins/fzf.lua
@@ -1,74 +1,76 @@
 ---@param kind 'issue'|'pr'
 ---@param state 'all'|'open'|'closed'
 local function gh_picker(kind, state)
-    if vim.fn.executable('gh') ~= 1 then
-        vim.notify('gh CLI not found', vim.log.levels.WARN)
-        return
-    end
-    local next_state = ({ all = 'open', open = 'closed', closed = 'all' })[state]
-    local label = kind == 'pr' and 'PRs' or 'Issues'
-    require('fzf-lua').fzf_exec(('gh %s list --limit 100 --state %s'):format(kind, state), {
-        prompt = ('%s (%s)> '):format(label, state),
-        header = ':: <c-o> to toggle all/open/closed',
-        actions = {
-            ['default'] = function(selected)
-                local num = selected[1]:match('^#?(%d+)')
-                if num then
-                    vim.system({ 'gh', kind, 'view', num, '--web' })
-                end
-            end,
-            ['ctrl-o'] = function()
-                gh_picker(kind, next_state)
-            end,
-        },
-    })
+  if vim.fn.executable "gh" ~= 1 then
+    vim.notify("gh CLI not found", vim.log.levels.WARN)
+    return
+  end
+  local next_state = ({ all = "open", open = "closed", closed = "all" })[state]
+  local label = kind == "pr" and "PRs" or "Issues"
+  require("fzf-lua").fzf_exec(("gh %s list --limit 100 --state %s"):format(kind, state), {
+    prompt = ("%s (%s)> "):format(label, state),
+    header = ":: <c-o> to toggle all/open/closed",
+    actions = {
+      ["default"] = function(selected)
+        local num = selected[1]:match "^#?(%d+)"
+        if num then vim.system { "gh", kind, "view", num, "--web" } end
+      end,
+      ["ctrl-o"] = function() gh_picker(kind, next_state) end,
+    },
+  })
 end
 
 return {
-    'ibhagwan/fzf-lua',
-    dependencies = { 'nvim-tree/nvim-web-devicons' },
-    config = function(_, opts)
-        require('fzf-lua').setup(opts)
+  "ibhagwan/fzf-lua",
+  dependencies = { "nvim-tree/nvim-web-devicons" },
+  config = function(_, opts)
+    local fzf = require "fzf-lua"
+    fzf.setup(opts)
 
-        map('n', '<C-f>', function()
-            local fzf = require('fzf-lua')
-            local git_dir = vim.fn.system('git rev-parse --git-dir 2>/dev/null'):gsub('\n', '')
-            if vim.v.shell_error == 0 and git_dir ~= '' then
-                fzf.git_files()
-            else
-                fzf.files()
-            end
-        end)
-        map('n', '<leader>ff', '<cmd>FzfLua files<cr>')
-        map('n', '<leader>fg', '<cmd>FzfLua live_grep<cr>')
-        map('n', '<leader>fb', '<cmd>FzfLua buffers<cr>')
-        map('n', '<leader>fh', '<cmd>FzfLua help_tags<cr>')
-        map('n', '<leader>fr', '<cmd>FzfLua resume<cr>')
-        map('n', '<leader>fo', '<cmd>FzfLua oldfiles<cr>')
-        map('n', '<leader>fc', '<cmd>FzfLua commands<cr>')
-        map('n', '<leader>fk', '<cmd>FzfLua keymaps<cr>')
-        map('n', '<leader>f/', '<cmd>FzfLua search_history<cr>')
-        map('n', '<leader>f:', '<cmd>FzfLua command_history<cr>')
-        map('n', '<leader>fe', '<cmd>FzfLua files cwd=~/.config<cr>')
-        map('n', 'gq', '<cmd>FzfLua quickfix<cr>')
-        map('n', 'gl', '<cmd>FzfLua loclist<cr>')
-        map('n', '<leader>GB', '<cmd>FzfLua git_branches<cr>')
-        map('n', '<leader>Gc', '<cmd>FzfLua git_commits<cr>')
-        map('n', '<leader>Gs', '<cmd>FzfLua git_status<cr>')
-        map('n', '<leader>Gp', function() gh_picker('pr', 'open') end)
-        map('n', '<leader>Gi', function() gh_picker('issue', 'open') end)
-    end,
-    opts = {
-        'default-title',
-        winopts = {
-            border = 'single',
-            preview = {
-                layout = 'vertical',
-                vertical = 'down:50%',
-            },
-        },
-        fzf_opts = {
-            ['--layout'] = 'reverse',
-        },
+    local ok, fzf_reload = pcall(require, "config.fzf_reload")
+    if ok then
+      fzf_reload.setup(opts)
+      fzf_reload.reload()
+    end
+
+    map("n", "<C-f>", function()
+      local git_dir = vim.fn.system("git rev-parse --git-dir 2>/dev/null"):gsub("\n", "")
+      if vim.v.shell_error == 0 and git_dir ~= "" then
+        fzf.git_files()
+      else
+        fzf.files()
+      end
+    end)
+    map("n", "<leader>ff", "<cmd>FzfLua files<cr>")
+    map("n", "<leader>fg", "<cmd>FzfLua live_grep<cr>")
+    map("n", "<leader>fb", "<cmd>FzfLua buffers<cr>")
+    map("n", "<leader>fh", "<cmd>FzfLua help_tags<cr>")
+    map("n", "<leader>fr", "<cmd>FzfLua resume<cr>")
+    map("n", "<leader>fo", "<cmd>FzfLua oldfiles<cr>")
+    map("n", "<leader>fc", "<cmd>FzfLua commands<cr>")
+    map("n", "<leader>fk", "<cmd>FzfLua keymaps<cr>")
+    map("n", "<leader>f/", "<cmd>FzfLua search_history<cr>")
+    map("n", "<leader>f:", "<cmd>FzfLua command_history<cr>")
+    map("n", "<leader>fe", "<cmd>FzfLua files cwd=~/.config<cr>")
+    map("n", "gq", "<cmd>FzfLua quickfix<cr>")
+    map("n", "gl", "<cmd>FzfLua loclist<cr>")
+    map("n", "<leader>GB", "<cmd>FzfLua git_branches<cr>")
+    map("n", "<leader>Gc", "<cmd>FzfLua git_commits<cr>")
+    map("n", "<leader>Gs", "<cmd>FzfLua git_status<cr>")
+    map("n", "<leader>Gp", function() gh_picker("pr", "open") end)
+    map("n", "<leader>Gi", function() gh_picker("issue", "open") end)
+  end,
+  opts = {
+    "default-title",
+    winopts = {
+      border = "single",
+      preview = {
+        layout = "vertical",
+        vertical = "down:50%",
+      },
     },
+    fzf_opts = {
+      ["--layout"] = "reverse",
+    },
+  },
 }
diff --git a/config/nvim/lua/plugins/ui.lua b/config/nvim/lua/plugins/ui.lua
index c8098cc..08f704c 100644
--- a/config/nvim/lua/plugins/ui.lua
+++ b/config/nvim/lua/plugins/ui.lua
@@ -1,74 +1,50 @@
 return {
-    {
-        'harivansh-afk/cozybox.nvim',
-        lazy = false,
-        priority = 1000,
-        config = function()
-            local function apply_cozybox_overrides()
-                local links = {
-                    { 'DiffsAdd', 'DiffAdd' },
-                    { 'DiffsDelete', 'DiffDelete' },
-                    { 'DiffsChange', 'DiffChange' },
-                    { 'DiffsText', 'DiffText' },
-                    { 'DiffsClear', 'Normal' },
-                }
-                for _, pair in ipairs(links) do
-                    vim.api.nvim_set_hl(0, pair[1], { link = pair[2], default = false })
-                end
-            end
-
-            vim.api.nvim_create_augroup('cozybox_fallback_highlights', { clear = true })
-            vim.api.nvim_create_autocmd('ColorScheme', {
-                group = 'cozybox_fallback_highlights',
-                callback = function()
-                    if vim.g.colors_name == 'cozybox' then
-                        apply_cozybox_overrides()
-                    end
-                end,
-            })
-
-            vim.cmd.colorscheme('cozybox')
-            apply_cozybox_overrides()
-        end,
-    },
-    {
-        'nvim-lualine/lualine.nvim',
-        dependencies = { 'nvim-tree/nvim-web-devicons' },
-        config = function()
-            local theme = {
-                normal = {
-                    a = { gui = 'bold' },
-                },
-                visual = {
-                    a = { gui = 'bold' },
-                },
-                replace = {
-                    a = { gui = 'bold' },
-                },
-                command = {
-                    a = { gui = 'bold' },
-                },
-            }
-            require('lualine').setup({
-                options = {
-                    icons_enabled = false,
-                    component_separators = '',
-                    section_separators = { left = '', right = '' },
-                    theme = theme,
-                },
-                sections = {
-                    lualine_a = { 'mode' },
-                    lualine_b = { 'FugitiveHead', 'diff' },
-                    lualine_c = { { 'filename', path = 0 } },
-                    lualine_x = { 'diagnostics' },
-                    lualine_y = { 'filetype' },
-                    lualine_z = { 'progress' },
-                },
-            })
-        end,
-    },
-    {
-        'barrettruth/nonicons.nvim',
-        dependencies = { 'nvim-tree/nvim-web-devicons' },
-    },
+  {
+    dir = vim.fn.expand "~/Documents/GitHub/cozybox.nvim",
+    name = "cozybox.nvim",
+    lazy = false,
+    priority = 1000,
+    config = function() require("theme").setup() end,
+  },
+  {
+    "nvim-lualine/lualine.nvim",
+    dependencies = { "nvim-tree/nvim-web-devicons" },
+    config = function()
+      local theme_status = function() return require("theme").statusline_label() end
+      local theme = {
+        normal = {
+          a = { gui = "bold" },
+        },
+        visual = {
+          a = { gui = "bold" },
+        },
+        replace = {
+          a = { gui = "bold" },
+        },
+        command = {
+          a = { gui = "bold" },
+        },
+      }
+      require("lualine").setup {
+        options = {
+          icons_enabled = false,
+          component_separators = "",
+          section_separators = { left = "", right = "" },
+          theme = theme,
+        },
+        sections = {
+          lualine_a = { "mode" },
+          lualine_b = { "FugitiveHead", "diff" },
+          lualine_c = { { "filename", path = 0 } },
+          lualine_x = { "diagnostics" },
+          lualine_y = { "filetype" },
+          lualine_z = { theme_status, "progress" },
+        },
+      }
+    end,
+  },
+  {
+    "barrettruth/nonicons.nvim",
+    dependencies = { "nvim-tree/nvim-web-devicons" },
+  },
 }
diff --git a/config/nvim/lua/theme.lua b/config/nvim/lua/theme.lua
new file mode 100644
index 0000000..3799192
--- /dev/null
+++ b/config/nvim/lua/theme.lua
@@ -0,0 +1,111 @@
+local M = {}
+
+local xdg_state_home = vim.env.XDG_STATE_HOME or (vim.env.HOME .. "/.local/state")
+local theme_state_file = xdg_state_home .. "/theme/current"
+local active_schemes = {
+  cozybox = true,
+  ["cozybox-light"] = true,
+}
+
+local function ensure_server_socket()
+  local socket_path = ("/tmp/nvim-%d.sock"):format(vim.fn.getpid())
+  local active_servers = vim.fn.serverlist()
+
+  for _, server in ipairs(active_servers) do
+    if server == socket_path then return end
+  end
+
+  local stat = vim.uv.fs_stat(socket_path)
+  if stat and stat.type == "socket" then vim.fn.delete(socket_path) end
+
+  vim.fn.serverstart(socket_path)
+end
+
+local function apply_cozybox_overrides()
+  local links = {
+    { "DiffsAdd", "DiffAdd" },
+    { "DiffsDelete", "DiffDelete" },
+    { "DiffsChange", "DiffChange" },
+    { "DiffsText", "DiffText" },
+    { "DiffsClear", "Normal" },
+  }
+
+  for _, pair in ipairs(links) do
+    vim.api.nvim_set_hl(0, pair[1], { link = pair[2], default = false })
+  end
+end
+
+local function read_mode()
+  local ok, lines = pcall(vim.fn.readfile, theme_state_file)
+  if not ok or not lines or not lines[1] then return "dark" end
+
+  local mode = vim.trim(lines[1])
+  if mode == "light" then return "light" end
+
+  return "dark"
+end
+
+local function colorscheme_for_mode(mode)
+  if mode == "light" then return "cozybox-light" end
+
+  return "cozybox"
+end
+
+function M.statusline_label()
+  local mode = vim.g.cozybox_theme_mode or read_mode()
+  local scheme = vim.g.colors_name or colorscheme_for_mode(mode)
+  local expected_scheme = colorscheme_for_mode(mode)
+
+  if scheme == expected_scheme then return "theme:" .. mode end
+
+  return ("theme:%s/%s"):format(mode, scheme)
+end
+
+function M.apply(mode)
+  local next_mode = mode or read_mode()
+  local next_scheme = colorscheme_for_mode(next_mode)
+
+  if vim.o.background ~= next_mode then vim.o.background = next_mode end
+
+  if vim.g.cozybox_theme_mode ~= next_mode or vim.g.colors_name ~= next_scheme then vim.cmd.colorscheme(next_scheme) end
+
+  vim.g.cozybox_theme_mode = next_mode
+  apply_cozybox_overrides()
+  local ok_reload, fzf_reload = pcall(require, "config.fzf_reload")
+  if ok_reload then pcall(fzf_reload.reload) end
+  vim.schedule(function()
+    local ok, lualine = pcall(require, "lualine")
+    if ok then pcall(lualine.refresh, { place = { "statusline" } }) end
+    pcall(vim.cmd, "redraw!")
+  end)
+end
+
+function M.setup()
+  local group = vim.api.nvim_create_augroup("cozybox_theme_sync", { clear = true })
+
+  ensure_server_socket()
+
+  vim.api.nvim_create_autocmd("ColorScheme", {
+    group = group,
+    callback = function()
+      if active_schemes[vim.g.colors_name] then apply_cozybox_overrides() end
+    end,
+  })
+
+  vim.api.nvim_create_autocmd({ "VimEnter", "FocusGained" }, {
+    group = group,
+    callback = function() M.apply() end,
+  })
+
+  vim.api.nvim_create_user_command("ThemeSync", function(opts)
+    local mode = opts.args ~= "" and opts.args or nil
+    M.apply(mode)
+  end, {
+    nargs = "?",
+    complete = function() return { "dark", "light" } end,
+  })
+
+  M.apply()
+end
+
+return M
diff --git a/home/default.nix b/home/default.nix
index cada377..84eed47 100644
--- a/home/default.nix
+++ b/home/default.nix
@@ -3,6 +3,7 @@
     ./bat.nix
     ./claude.nix
     ./codex.nix
+    ./fzf.nix
     ./gcloud.nix
     ./gh.nix
     ./ghostty.nix
@@ -13,6 +14,7 @@
     ./migration.nix
     ./nvim.nix
     ./rectangle.nix
+    ./scripts.nix
     ./tmux.nix
     ./zsh.nix
   ];
diff --git a/home/fzf.nix b/home/fzf.nix
new file mode 100644
index 0000000..c0f5ee4
--- /dev/null
+++ b/home/fzf.nix
@@ -0,0 +1,10 @@
+{config, ...}: let
+  theme = import ../lib/theme.nix {inherit config;};
+in {
+  home.sessionVariables = {
+    FZF_DEFAULT_OPTS_FILE = theme.paths.fzfCurrentFile;
+  };
+
+  xdg.configFile."fzf/themes/cozybox-dark".text = theme.renderFzf "dark";
+  xdg.configFile."fzf/themes/cozybox-light".text = theme.renderFzf "light";
+}
diff --git a/home/ghostty.nix b/home/ghostty.nix
index c2a9e50..13e359b 100644
--- a/home/ghostty.nix
+++ b/home/ghostty.nix
@@ -1,11 +1,11 @@
-{ pkgs, ... }:
-let
+{
+  config,
+  pkgs,
+  ...
+}: let
+  theme = import ../lib/theme.nix {inherit config;};
   ghosttyConfig = ''
-    theme = "Gruvbox Material Dark"
-    background = #181818
-    cursor-color = #ddc7a1
-    selection-background = #504945
-    selection-foreground = #ebdbb2
+    theme = "cozybox-current"
     font-family = Berkeley Mono
     font-codepoint-map = U+f101-U+f25c=nonicons
     background-opacity = 1
@@ -38,12 +38,6 @@ let
     keybind = vim/i=deactivate_key_table
     keybind = vim/catch_all=ignore
     mouse-hide-while-typing = true
-    palette = 2=#8ec97c
-    palette = 10=#8ec97c
-    palette = 4=#4672d4
-    palette = 12=#4672d4
-    palette = 6=#8ec07c
-    palette = 14=#8ec07c
     macos-titlebar-style = hidden
     macos-option-as-alt = true
     confirm-close-surface = true
@@ -67,6 +61,9 @@ in {
     force = true;
   };
 
+  xdg.configFile."ghostty/themes/cozybox-dark".text = theme.renderGhostty "dark";
+  xdg.configFile."ghostty/themes/cozybox-light".text = theme.renderGhostty "light";
+
   home.file."Library/Application Support/com.mitchellh.ghostty/config.ghostty" = {
     text = ghosttyConfig;
     force = true;
diff --git a/home/scripts.nix b/home/scripts.nix
new file mode 100644
index 0000000..bccc35b
--- /dev/null
+++ b/home/scripts.nix
@@ -0,0 +1,39 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}: let
+  customScripts = import ../scripts {inherit config lib pkgs;};
+in {
+  home.packages = builtins.attrValues customScripts.packages;
+
+  home.activation.initializeThemeState = lib.hm.dag.entryAfter ["writeBoundary"] ''
+    mkdir -p "${customScripts.theme.paths.stateDir}" "${customScripts.theme.paths.fzfDir}" "${customScripts.theme.paths.ghosttyDir}" "${customScripts.theme.paths.tmuxDir}"
+
+    if [[ -f "${customScripts.theme.paths.stateFile}" ]]; then
+      mode=$(tr -d '[:space:]' < "${customScripts.theme.paths.stateFile}")
+    else
+      mode="${customScripts.theme.defaultMode}"
+      printf '%s\n' "$mode" > "${customScripts.theme.paths.stateFile}"
+    fi
+
+    case "$mode" in
+      light)
+        fzf_target="${customScripts.theme.paths.fzfDir}/cozybox-light"
+        ghostty_target="${customScripts.theme.paths.ghosttyDir}/cozybox-light"
+        tmux_target="${customScripts.tmuxConfigs.light}"
+        ;;
+      *)
+        printf '%s\n' "${customScripts.theme.defaultMode}" > "${customScripts.theme.paths.stateFile}"
+        fzf_target="${customScripts.theme.paths.fzfDir}/cozybox-dark"
+        ghostty_target="${customScripts.theme.paths.ghosttyDir}/cozybox-dark"
+        tmux_target="${customScripts.tmuxConfigs.dark}"
+        ;;
+    esac
+
+    ln -sfn "$fzf_target" "${customScripts.theme.paths.fzfCurrentFile}"
+    ln -sfn "$ghostty_target" "${customScripts.theme.paths.ghosttyCurrentFile}"
+    ln -sfn "$tmux_target" "${customScripts.theme.paths.tmuxCurrentFile}"
+  '';
+}
diff --git a/home/tmux.nix b/home/tmux.nix
index 5dcccae..f9d7e31 100644
--- a/home/tmux.nix
+++ b/home/tmux.nix
@@ -1,4 +1,11 @@
-{lib, pkgs, ...}: {
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}: let
+  theme = import ../lib/theme.nix {inherit config;};
+in {
   programs.tmux = {
     enable = true;
     plugins = with pkgs.tmuxPlugins; [
@@ -75,54 +82,14 @@
       # Disable waiting time when pressing escape, for smoother Neovim usage.
       set-option -s escape-time 0
 
-      # Styling
-      RED="#ea6962"
-      GREEN="#8ec97c"
-      YELLOW="#d8a657"
-      BLUE="#4672d4"
-      MAGENTA="#d3869b"
-      CYAN="#89b482"
-      BLACK="#1d2021"
-      DARK_GRAY="#181818"
-      LIGHT_GRAY="#4F4946"
-      # Match Ghostty theme (cozybox-override palette + Gruvbox Material Dark base)
-      BG="#181818"
-      FG="#d4be98"
-
-      HALF_ROUND_OPEN="#(printf '\uE0B2')"
-      HALF_ROUND_CLOSE="#(printf '\uE0B0')"
-      TRIANGLE_OPEN="#(printf '\uE0B2')"
-      TRIANGLE_CLOSE="#(printf '\uE0B0')"
-
+      set-option -g prompt-cursor-colour default
       set-option -g status-position bottom
-      set-option -g status-style bg=''${BG},fg=''${FG}
       set-option -g status-justify left
       set-option -g status-left ""
       set-option -g status-right "#(~/.config/tmux/session-list.sh)"
       set-option -g status-left-length 100
       set-option -g status-right-length 100
-
-      set-option -g window-status-format "\
-       \
-      #I\
-      #[fg=''${MAGENTA}]:\
-      #[fg=default]#W\
-       \
-      "
-
-      set-option -g window-status-current-format "\
-       \
-      #[fg=''${MAGENTA}]*#[fg=default]#I\
-      #[fg=''${MAGENTA}]:\
-      #[fg=default]#W\
-       \
-      "
-
-      set-option -g window-status-separator ""
-
-      set-option -g pane-border-style fg=''${BG}
-      set-option -g pane-active-border-style fg=''${BG}
-
+      source-file "${theme.paths.tmuxCurrentFile}"
     '';
   };
 
@@ -131,9 +98,10 @@
     text = ''
       #!/bin/sh
       current=$(tmux display-message -p '#S')
+      accent=$(tmux show -gv @cozybox-accent 2>/dev/null || printf '#d3869b')
       tmux list-sessions -F '#S' | while IFS= read -r s; do
         if [ "$s" = "$current" ]; then
-          printf ' #[fg=#d3869b]*#[fg=default]%s ' "$s"
+          printf ' #[fg=%s]*#[fg=default]%s ' "$accent" "$s"
         else
           printf ' %s ' "$s"
         fi
diff --git a/home/zsh.nix b/home/zsh.nix
index 70d78b5..effccd1 100644
--- a/home/zsh.nix
+++ b/home/zsh.nix
@@ -41,11 +41,11 @@
       tailscale = "/Applications/Tailscale.app/Contents/MacOS/Tailscale";
 
       # nix helpers
-      nr = "nix profile remove";               # nr <index> - remove from profile
-      ns = "nix search nixpkgs";               # ns <query> - search packages
-      nls = "nix profile list";                # nls - list installed profile packages
-      nrb = "sudo darwin-rebuild switch --flake ~/Documents/GitHub/nix";  # nrb - rebuild declarative config
-      nup = "nix flake update ~/Documents/GitHub/nix && sudo darwin-rebuild switch --flake ~/Documents/GitHub/nix";  # nup - update flake + rebuild
+      nr = "nix profile remove"; # nr <index> - remove from profile
+      ns = "nix search nixpkgs"; # ns <query> - search packages
+      nls = "nix profile list"; # nls - list installed profile packages
+      nrb = "sudo darwin-rebuild switch --flake ~/Documents/GitHub/nix"; # nrb - rebuild declarative config
+      nup = "nix flake update ~/Documents/GitHub/nix && sudo darwin-rebuild switch --flake ~/Documents/GitHub/nix"; # nup - update flake + rebuild
     };
 
     envExtra = ''
@@ -108,16 +108,92 @@
           $path
         )
 
-        ni() { nix profile add "nixpkgs#$1"; }
+        _codex_read_theme_mode() {
+          local mode_file="$HOME/.local/state/theme/current"
+          if [[ -f "$mode_file" ]]; then
+            local mode
+            mode=$(tr -d '[:space:]' < "$mode_file")
+            if [[ "$mode" == light || "$mode" == dark ]]; then
+              printf '%s' "$mode"
+              return
+            fi
+          fi
+
+          printf 'dark'
+        }
+
+        _codex_apply_highlight_styles() {
+          local mode="$(_codex_read_theme_mode)"
+          if [[ "$mode" == "''${_CODEX_LAST_HIGHLIGHT_THEME:-}" ]]; then
+            return
+          fi
+
+          typeset -gA ZSH_HIGHLIGHT_STYLES
+
+          if [[ "$mode" == light ]]; then
+            ZSH_HIGHLIGHT_STYLES[arg0]='fg=#427b58'
+            ZSH_HIGHLIGHT_STYLES[autodirectory]='fg=#427b58,underline'
+            ZSH_HIGHLIGHT_STYLES[back-dollar-quoted-argument]='fg=#076678'
+            ZSH_HIGHLIGHT_STYLES[back-double-quoted-argument]='fg=#076678'
+            ZSH_HIGHLIGHT_STYLES[back-quoted-argument-delimiter]='fg=#8f3f71'
+            ZSH_HIGHLIGHT_STYLES[bracket-error]='fg=#ea6962,bold'
+            ZSH_HIGHLIGHT_STYLES[bracket-level-1]='fg=#076678,bold'
+            ZSH_HIGHLIGHT_STYLES[bracket-level-2]='fg=#427b58,bold'
+            ZSH_HIGHLIGHT_STYLES[bracket-level-3]='fg=#8f3f71,bold'
+            ZSH_HIGHLIGHT_STYLES[bracket-level-4]='fg=#b57614,bold'
+            ZSH_HIGHLIGHT_STYLES[bracket-level-5]='fg=#076678,bold'
+            ZSH_HIGHLIGHT_STYLES[comment]='fg=#928374'
+            ZSH_HIGHLIGHT_STYLES[command-substitution-delimiter]='fg=#8f3f71'
+            ZSH_HIGHLIGHT_STYLES[dollar-double-quoted-argument]='fg=#076678'
+            ZSH_HIGHLIGHT_STYLES[dollar-quoted-argument]='fg=#b57614'
+            ZSH_HIGHLIGHT_STYLES[double-quoted-argument]='fg=#b57614'
+            ZSH_HIGHLIGHT_STYLES[global-alias]='fg=#076678'
+            ZSH_HIGHLIGHT_STYLES[globbing]='fg=#076678'
+            ZSH_HIGHLIGHT_STYLES[history-expansion]='fg=#076678'
+            ZSH_HIGHLIGHT_STYLES[path]='fg=#3c3836,underline'
+            ZSH_HIGHLIGHT_STYLES[precommand]='fg=#427b58,underline'
+            ZSH_HIGHLIGHT_STYLES[process-substitution-delimiter]='fg=#8f3f71'
+            ZSH_HIGHLIGHT_STYLES[rc-quote]='fg=#076678'
+            ZSH_HIGHLIGHT_STYLES[redirection]='fg=#b57614'
+            ZSH_HIGHLIGHT_STYLES[reserved-word]='fg=#b57614'
+            ZSH_HIGHLIGHT_STYLES[single-quoted-argument]='fg=#b57614'
+            ZSH_HIGHLIGHT_STYLES[suffix-alias]='fg=#427b58,underline'
+            ZSH_HIGHLIGHT_STYLES[unknown-token]='fg=#ea6962,bold'
+          else
+            ZSH_HIGHLIGHT_STYLES[arg0]='fg=#8ec97c'
+            ZSH_HIGHLIGHT_STYLES[autodirectory]='fg=#8ec97c,underline'
+            ZSH_HIGHLIGHT_STYLES[back-dollar-quoted-argument]='fg=#8ec07c'
+            ZSH_HIGHLIGHT_STYLES[back-double-quoted-argument]='fg=#8ec07c'
+            ZSH_HIGHLIGHT_STYLES[back-quoted-argument-delimiter]='fg=#d3869b'
+            ZSH_HIGHLIGHT_STYLES[bracket-error]='fg=#ea6962,bold'
+            ZSH_HIGHLIGHT_STYLES[bracket-level-1]='fg=#5b84de,bold'
+            ZSH_HIGHLIGHT_STYLES[bracket-level-2]='fg=#8ec97c,bold'
+            ZSH_HIGHLIGHT_STYLES[bracket-level-3]='fg=#d3869b,bold'
+            ZSH_HIGHLIGHT_STYLES[bracket-level-4]='fg=#d8a657,bold'
+            ZSH_HIGHLIGHT_STYLES[bracket-level-5]='fg=#8ec07c,bold'
+            ZSH_HIGHLIGHT_STYLES[comment]='fg=#7c6f64'
+            ZSH_HIGHLIGHT_STYLES[command-substitution-delimiter]='fg=#d3869b'
+            ZSH_HIGHLIGHT_STYLES[dollar-double-quoted-argument]='fg=#8ec07c'
+            ZSH_HIGHLIGHT_STYLES[dollar-quoted-argument]='fg=#d8a657'
+            ZSH_HIGHLIGHT_STYLES[double-quoted-argument]='fg=#d8a657'
+            ZSH_HIGHLIGHT_STYLES[global-alias]='fg=#8ec07c'
+            ZSH_HIGHLIGHT_STYLES[globbing]='fg=#5b84de'
+            ZSH_HIGHLIGHT_STYLES[history-expansion]='fg=#5b84de'
+            ZSH_HIGHLIGHT_STYLES[path]='fg=#d4be98,underline'
+            ZSH_HIGHLIGHT_STYLES[precommand]='fg=#8ec97c,underline'
+            ZSH_HIGHLIGHT_STYLES[process-substitution-delimiter]='fg=#d3869b'
+            ZSH_HIGHLIGHT_STYLES[rc-quote]='fg=#8ec07c'
+            ZSH_HIGHLIGHT_STYLES[redirection]='fg=#d8a657'
+            ZSH_HIGHLIGHT_STYLES[reserved-word]='fg=#d8a657'
+            ZSH_HIGHLIGHT_STYLES[single-quoted-argument]='fg=#d8a657'
+            ZSH_HIGHLIGHT_STYLES[suffix-alias]='fg=#8ec97c,underline'
+            ZSH_HIGHLIGHT_STYLES[unknown-token]='fg=#ea6962,bold'
+          fi
+
+          typeset -g _CODEX_LAST_HIGHLIGHT_THEME="$mode"
+        }
 
         unalias ga 2>/dev/null
-        ga() {
-          if [[ $# -eq 0 ]]; then
-            git add .
-          else
-            git add "$@"
-          fi
-        }
 
         git() {
           command git "$@"
@@ -162,6 +238,7 @@
         zle -N zle-line-finish
 
         precmd() {
+          _codex_apply_highlight_styles
           _codex_set_cursor beam
         }
 
@@ -169,136 +246,11 @@
           _codex_set_cursor beam
         }
 
-        iosrun() {
-          local project=$(find . -maxdepth 1 -name "*.xcodeproj" | head -1)
-          local scheme=$(basename "$project" .xcodeproj)
-          local derived=".derived-data"
-          local sim_name="''${1:-iPhone 16e}"
-
-          if [[ -z "$project" ]]; then
-            echo "No .xcodeproj found in current directory"
-            return 1
-          fi
-
-          echo "Building $scheme..."
-          if ! xcodebuild -project "$project" -scheme "$scheme" \
-            -destination "platform=iOS Simulator,name=$sim_name" \
-            -derivedDataPath "$derived" build -quiet; then
-            echo "Build failed"
-            return 1
-          fi
-
-          echo "Build succeeded. Launching simulator..."
-
-          xcrun simctl boot "$sim_name" 2>/dev/null
-          open -a Simulator
-
-          local app_path="$derived/Build/Products/Debug-iphonesimulator/$scheme.app"
-          local bundle_id=$(/usr/libexec/PlistBuddy -c "Print :CFBundleIdentifier" "$app_path/Info.plist")
-
-          echo "Installing $scheme..."
-          while ! xcrun simctl install "$sim_name" "$app_path" 2>/dev/null; do
-            sleep 0.5
-          done
-
-          echo "Launching $bundle_id..."
-          while ! xcrun simctl launch "$sim_name" "$bundle_id" 2>&1 | grep -q "$bundle_id"; do
-            sleep 0.5
-          done
-
-          echo "Launched $bundle_id - streaming logs (Ctrl+C to stop)"
-          echo "----------------------------------------"
-
-          xcrun simctl spawn "$sim_name" log stream \
-            --predicate "(subsystem CONTAINS '$bundle_id' OR process == '$scheme') AND NOT subsystem BEGINSWITH 'com.apple'" \
-            --style compact \
-            --color always 2>/dev/null | while read -r line; do
-            if [[ "$line" == *"error"* ]] || [[ "$line" == *"Error"* ]]; then
-              echo "\033[31m$line\033[0m"
-            elif [[ "$line" == *"warning"* ]] || [[ "$line" == *"Warning"* ]]; then
-              echo "\033[33m$line\033[0m"
-            else
-              echo "$line"
-            fi
-          done
-        }
-
-        mdview() {
-          markserv "$1"
-        }
+        _codex_apply_highlight_styles
 
         if command -v wt >/dev/null 2>&1; then
           eval "$(command wt config shell init zsh)"
         fi
-
-        wtc() { wt switch --create --base @ "$@"; }
-
-        unalias gpr 2>/dev/null
-        gpr() {
-          while true; do
-            local pr=$(gh pr list --limit 50 \
-              --json number,title,author,headRefName \
-              --template '{{range .}}#{{.number}} {{.title}} ({{.author.login}}) [{{.headRefName}}]{{"\n"}}{{end}}' \
-              | fzf --preview 'gh pr view {1} --comments' \
-                    --preview-window=right:60%:wrap \
-                    --header 'enter: view | ctrl-m: merge | ctrl-x: close | ctrl-o: checkout | ctrl-b: browser' \
-                    --bind 'ctrl-o:execute(gh pr checkout {1})' \
-                    --bind 'ctrl-b:execute(gh pr view {1} --web)' \
-                    --expect=ctrl-m,ctrl-x,enter)
-
-            [[ -z "$pr" ]] && return
-
-            local key=$(echo "$pr" | head -1)
-            local selection=$(echo "$pr" | tail -1)
-            local num=$(echo "$selection" | grep -o '#[0-9]*' | tr -d '#')
-
-            [[ -z "$num" ]] && return
-
-            case "$key" in
-              ctrl-m)
-                echo "Merge PR #$num? (y/n)"
-                read -q && gh pr merge "$num" --merge
-                echo
-                ;;
-              ctrl-x)
-                echo "Close PR #$num? (y/n)"
-                read -q && gh pr close "$num"
-                echo
-                ;;
-              enter|"")
-                gh pr view "$num"
-                ;;
-            esac
-          done
-        }
-
-        ghpr() {
-          local base=$(git rev-parse --abbrev-ref HEAD)
-          local upstream="''${1:-main}"
-          local remote_ref="origin/$upstream"
-          local unpushed=$(git log "$remote_ref"..HEAD --oneline 2>/dev/null)
-
-          if [[ -z "$unpushed" ]]; then
-            if git diff --cached --quiet; then
-              echo "No unpushed commits and no staged changes"
-              return 1
-            fi
-            echo "No unpushed commits, but staged changes found. Opening commit dialog..."
-            git commit || return 1
-          fi
-
-          local msg=$(git log "$remote_ref"..HEAD --format='%s' --reverse | head -1)
-          local branch=$(echo "$msg" | tr '[:upper:]' '[:lower:]' | sed 's/[^a-z0-9]/-/g' | sed 's/--*/-/g' | sed 's/^-//;s/-$//')
-
-          git checkout -b "$branch"
-          git checkout "$base"
-          git reset --hard "$remote_ref"
-          git checkout "$branch"
-
-          git push -u origin "$branch"
-          gh pr create --base "$upstream" --fill --web 2>/dev/null || gh pr create --base "$upstream" --fill
-          gh pr view "$branch" --json url -q '.url'
-        }
       '')
 
       (lib.mkAfter ''
diff --git a/lib/theme.nix b/lib/theme.nix
new file mode 100644
index 0000000..8123e56
--- /dev/null
+++ b/lib/theme.nix
@@ -0,0 +1,135 @@
+{config, ...}: let
+  defaultMode = "dark";
+  sharedPalette = {
+    red = "#ea6962";
+    green = "#8ec97c";
+    yellow = "#d79921";
+    yellowBright = "#fabd2f";
+    blue = "#5b84de";
+    purple = "#d3869b";
+    purpleNeutral = "#b16286";
+    aqua = "#8ec07c";
+    aquaNeutral = "#689d6a";
+    gray = "#928374";
+  };
+  paths = {
+    stateDir = "${config.xdg.stateHome}/theme";
+    stateFile = "${config.xdg.stateHome}/theme/current";
+    fzfDir = "${config.xdg.configHome}/fzf/themes";
+    fzfCurrentFile = "${config.xdg.configHome}/fzf/themes/theme";
+    ghosttyDir = "${config.xdg.configHome}/ghostty/themes";
+    ghosttyCurrentFile = "${config.xdg.configHome}/ghostty/themes/cozybox-current";
+    tmuxDir = "${config.xdg.configHome}/tmux/theme";
+    tmuxCurrentFile = "${config.xdg.configHome}/tmux/theme/current.conf";
+  };
+
+  themes = {
+    dark = {
+      background = "#181818";
+      surface = "#1e1e1e";
+      selectionBackground = "#504945";
+      selectionForeground = "#ebdbb2";
+      cursorColor = "#ddc7a1";
+      cursorText = "#181818";
+      foreground = "#ebdbb2";
+      text = "#d4be98";
+      mutedText = "#7c6f64";
+      blue = sharedPalette.blue;
+      green = sharedPalette.green;
+      purple = sharedPalette.purple;
+      border = "#181818";
+      palette = [
+        "#1d2021"
+        sharedPalette.red
+        sharedPalette.green
+        sharedPalette.yellow
+        sharedPalette.blue
+        sharedPalette.purpleNeutral
+        sharedPalette.aquaNeutral
+        "#a89984"
+        sharedPalette.gray
+        sharedPalette.red
+        sharedPalette.green
+        sharedPalette.yellowBright
+        sharedPalette.blue
+        sharedPalette.purple
+        sharedPalette.aqua
+        "#ebdbb2"
+      ];
+    };
+
+    light = {
+      background = "#e7e7e7";
+      surface = "#e1e1e1";
+      selectionBackground = "#c3c7c9";
+      selectionForeground = "#3c3836";
+      cursorColor = "#282828";
+      cursorText = "#e7e7e7";
+      foreground = "#3c3836";
+      text = "#3c3836";
+      mutedText = "#665c54";
+      blue = sharedPalette.blue;
+      green = sharedPalette.green;
+      purple = sharedPalette.purple;
+      border = "#e7e7e7";
+      palette = [
+        "#f9f5d7"
+        "#923f3a"
+        sharedPalette.green
+        sharedPalette.yellow
+        "#4261a5"
+        sharedPalette.purpleNeutral
+        sharedPalette.aquaNeutral
+        "#7c6f64"
+        sharedPalette.gray
+        "#923f3a"
+        sharedPalette.green
+        sharedPalette.yellowBright
+        "#4261a5"
+        sharedPalette.purple
+        sharedPalette.aqua
+        "#3c3836"
+      ];
+    };
+  };
+
+  renderGhostty = mode: let
+    theme = themes.${mode};
+    paletteLines =
+      builtins.concatStringsSep "\n"
+      (builtins.genList
+        (index: "palette = ${toString index}=${builtins.elemAt theme.palette index}")
+        (builtins.length theme.palette));
+  in ''
+    background = ${theme.background}
+    foreground = ${theme.foreground}
+    cursor-color = ${theme.cursorColor}
+    cursor-text = ${theme.cursorText}
+    selection-background = ${theme.selectionBackground}
+    selection-foreground = ${theme.selectionForeground}
+    ${paletteLines}
+  '';
+
+  renderTmux = mode: let
+    theme = themes.${mode};
+  in ''
+    set-option -g @cozybox-mode '${mode}'
+    set-option -g @cozybox-accent '${theme.purple}'
+    set-option -g status-style bg=${theme.background},fg=${theme.text}
+    set-option -g window-status-format " #I#[fg=${theme.purple}]:#[fg=default]#W "
+    set-option -g window-status-current-format " #[fg=${theme.purple}]*#[fg=default]#I#[fg=${theme.purple}]:#[fg=default]#W "
+    set-option -g window-status-separator ""
+    set-option -g pane-border-style fg=${theme.border}
+    set-option -g pane-active-border-style fg=${theme.border}
+  '';
+
+  renderFzf = mode: let
+    theme = themes.${mode};
+  in ''
+    --color=fg:${theme.text},bg:${theme.background},hl:${theme.blue}
+    --color=fg+:${theme.text},bg+:${theme.surface},hl+:${theme.blue}
+    --color=info:${theme.green},prompt:${theme.blue},pointer:${theme.text},marker:${theme.green},spinner:${theme.text}
+  '';
+in {
+  inherit defaultMode paths renderFzf renderGhostty renderTmux themes;
+}
diff --git a/scripts/default.nix b/scripts/default.nix
new file mode 100644
index 0000000..7735e03
--- /dev/null
+++ b/scripts/default.nix
@@ -0,0 +1,95 @@
+{
+  config,
+  lib,
+  pkgs,
+}: let
+  theme = import ../lib/theme.nix {inherit config;};
+
+  tmuxConfigs = {
+    dark = pkgs.writeText "tmux-theme-dark.conf" (theme.renderTmux "dark");
+    light = pkgs.writeText "tmux-theme-light.conf" (theme.renderTmux "light");
+  };
+
+  mkScript = {
+    file,
+    name,
+    runtimeInputs ? [],
+    replacements ? {},
+  }:
+    pkgs.writeShellApplication {
+      inherit name runtimeInputs;
+      text =
+        lib.replaceStrings
+        (builtins.attrNames replacements)
+        (builtins.attrValues replacements)
+        (builtins.readFile file);
+    };
+
+  packages = {
+    ga = mkScript {
+      name = "ga";
+      file = ./ga.sh;
+      runtimeInputs = with pkgs; [git];
+    };
+
+    ghpr = mkScript {
+      name = "ghpr";
+      file = ./ghpr.sh;
+      runtimeInputs = with pkgs; [gh git gnugrep gnused coreutils];
+    };
+
+    gpr = mkScript {
+      name = "gpr";
+      file = ./gpr.sh;
+      runtimeInputs = with pkgs; [gh fzf gnugrep coreutils];
+    };
+
+    iosrun = mkScript {
+      name = "iosrun";
+      file = ./iosrun.sh;
+      runtimeInputs = with pkgs; [findutils gnugrep coreutils];
+    };
+
+    mdview = mkScript {
+      name = "mdview";
+      file = ./mdview.sh;
+    };
+
+    ni = mkScript {
+      name = "ni";
+      file = ./ni.sh;
+      runtimeInputs = with pkgs; [nix];
+    };
+
+    theme = mkScript {
+      name = "theme";
+      file = ./theme.sh;
+      runtimeInputs = with pkgs; [coreutils findutils neovim tmux];
+      replacements = {
+        "@DEFAULT_MODE@" = theme.defaultMode;
+        "@STATE_DIR@" = theme.paths.stateDir;
+        "@STATE_FILE@" = theme.paths.stateFile;
+        "@FZF_DIR@" = theme.paths.fzfDir;
+        "@FZF_CURRENT_FILE@" = theme.paths.fzfCurrentFile;
+        "@FZF_DARK_FILE@" = "${theme.paths.fzfDir}/cozybox-dark";
+        "@FZF_LIGHT_FILE@" = "${theme.paths.fzfDir}/cozybox-light";
+        "@GHOSTTY_DIR@" = theme.paths.ghosttyDir;
+        "@GHOSTTY_CURRENT_FILE@" = theme.paths.ghosttyCurrentFile;
+        "@GHOSTTY_DARK_FILE@" = "${theme.paths.ghosttyDir}/cozybox-dark";
+        "@GHOSTTY_LIGHT_FILE@" = "${theme.paths.ghosttyDir}/cozybox-light";
+        "@TMUX_DIR@" = theme.paths.tmuxDir;
+        "@TMUX_CURRENT_FILE@" = theme.paths.tmuxCurrentFile;
+        "@TMUX_DARK_FILE@" = "${tmuxConfigs.dark}";
+        "@TMUX_LIGHT_FILE@" = "${tmuxConfigs.light}";
+        "@TMUX_CONFIG@" = "${config.xdg.configHome}/tmux/tmux.conf";
+      };
+    };
+
+    wtc = mkScript {
+      name = "wtc";
+      file = ./wtc.sh;
+    };
+  };
+in {
+  inherit packages theme tmuxConfigs;
+}
diff --git a/scripts/ga.sh b/scripts/ga.sh
new file mode 100644
index 0000000..6594482
--- /dev/null
+++ b/scripts/ga.sh
@@ -0,0 +1,9 @@
+if [[ $# -eq 0 ]]; then
+  git add .
+else
+  git add "$@"
+fi
+
+if command -v critic >/dev/null 2>&1; then
+  ( critic review 2>/dev/null & )
+fi
diff --git a/scripts/ghpr.sh b/scripts/ghpr.sh
new file mode 100644
index 0000000..db8e7cd
--- /dev/null
+++ b/scripts/ghpr.sh
@@ -0,0 +1,26 @@
+base=$(git rev-parse --abbrev-ref HEAD)
+upstream="${1:-main}"
+remote_ref="origin/$upstream"
+unpushed=$(git log "$remote_ref"..HEAD --oneline 2>/dev/null)
+
+if [[ -z "$unpushed" ]]; then
+  if git diff --cached --quiet; then
+    echo "No unpushed commits and no staged changes"
+    exit 1
+  fi
+
+  echo "No unpushed commits, but staged changes found. Opening commit dialog..."
+  git commit
+fi
+
+msg=$(git log "$remote_ref"..HEAD --format='%s' --reverse | head -1)
+branch=$(echo "$msg" | tr '[:upper:]' '[:lower:]' | sed 's/[^a-z0-9]/-/g' | sed 's/--*/-/g' | sed 's/^-//;s/-$//')
+
+git checkout -b "$branch"
+git checkout "$base"
+git reset --hard "$remote_ref"
+git checkout "$branch"
+
+git push -u origin "$branch"
+gh pr create --base "$upstream" --fill --web 2>/dev/null || gh pr create --base "$upstream" --fill
+gh pr view "$branch" --json url -q '.url'
diff --git a/scripts/gpr.sh b/scripts/gpr.sh
new file mode 100644
index 0000000..44db53d
--- /dev/null
+++ b/scripts/gpr.sh
@@ -0,0 +1,39 @@
+while true; do
+  pr=$(
+    gh pr list --limit 50 \
+      --json number,title,author,headRefName \
+      --template '{{range .}}#{{.number}} {{.title}} ({{.author.login}}) [{{.headRefName}}]{{"\n"}}{{end}}' \
+      | fzf --preview 'gh pr view {1} --comments' \
+        --preview-window=right:60%:wrap \
+        --header 'enter: view | ctrl-m: merge | ctrl-x: close | ctrl-o: checkout | ctrl-b: browser' \
+        --bind 'ctrl-o:execute(gh pr checkout {1})' \
+        --bind 'ctrl-b:execute(gh pr view {1} --web)' \
+        --expect=ctrl-m,ctrl-x,enter
+  )
+
+  [[ -z "$pr" ]] && exit 0
+
+  key=$(echo "$pr" | head -1)
+  selection=$(echo "$pr" | tail -1)
+  num=$(echo "$selection" | grep -o '#[0-9]*' | tr -d '#')
+
+  [[ -z "$num" ]] && exit 0
+
+  case "$key" in
+    ctrl-m)
+      read -r -p "Merge PR #$num? [y/N] " response
+      if [[ "$response" =~ ^[Yy]$ ]]; then
+        gh pr merge "$num" --merge
+      fi
+      ;;
+    ctrl-x)
+      read -r -p "Close PR #$num? [y/N] " response
+      if [[ "$response" =~ ^[Yy]$ ]]; then
+        gh pr close "$num"
+      fi
+      ;;
+    enter|"")
+      gh pr view "$num"
+      ;;
+  esac
+done
diff --git a/scripts/iosrun.sh b/scripts/iosrun.sh
new file mode 100644
index 0000000..d469694
--- /dev/null
+++ b/scripts/iosrun.sh
@@ -0,0 +1,51 @@
+project=$(find . -maxdepth 1 -name "*.xcodeproj" | head -1)
+scheme=$(basename "$project" .xcodeproj)
+derived=".derived-data"
+sim_name="${1:-iPhone 16e}"
+
+if [[ -z "$project" ]]; then
+  echo "No .xcodeproj found in current directory"
+  exit 1
+fi
+
+echo "Building $scheme..."
+if ! xcodebuild -project "$project" -scheme "$scheme" \
+  -destination "platform=iOS Simulator,name=$sim_name" \
+  -derivedDataPath "$derived" build -quiet; then
+  echo "Build failed"
+  exit 1
+fi
+
+echo "Build succeeded. Launching simulator..."
+
+xcrun simctl boot "$sim_name" 2>/dev/null || true
+open -a Simulator
+
+app_path="$derived/Build/Products/Debug-iphonesimulator/$scheme.app"
+bundle_id=$(/usr/libexec/PlistBuddy -c "Print :CFBundleIdentifier" "$app_path/Info.plist")
+
+echo "Installing $scheme..."
+while ! xcrun simctl install "$sim_name" "$app_path" 2>/dev/null; do
+  sleep 0.5
+done
+
+echo "Launching $bundle_id..."
+while ! xcrun simctl launch "$sim_name" "$bundle_id" 2>&1 | grep -q "$bundle_id"; do
+  sleep 0.5
+done
+
+echo "Launched $bundle_id - streaming logs (Ctrl+C to stop)"
+echo "----------------------------------------"
+
+xcrun simctl spawn "$sim_name" log stream \
+  --predicate "(subsystem CONTAINS '$bundle_id' OR process == '$scheme') AND NOT subsystem BEGINSWITH 'com.apple'" \
+  --style compact \
+  --color always 2>/dev/null | while read -r line; do
+  if [[ "$line" == *"error"* ]] || [[ "$line" == *"Error"* ]]; then
+    printf '\033[31m%s\033[0m\n' "$line"
+  elif [[ "$line" == *"warning"* ]] || [[ "$line" == *"Warning"* ]]; then
+    printf '\033[33m%s\033[0m\n' "$line"
+  else
+    echo "$line"
+  fi
+done
diff --git a/scripts/mdview.sh b/scripts/mdview.sh
new file mode 100644
index 0000000..b0352fd
--- /dev/null
+++ b/scripts/mdview.sh
@@ -0,0 +1 @@
+exec markserv "$@"
diff --git a/scripts/ni.sh b/scripts/ni.sh
new file mode 100644
index 0000000..1cc8338
--- /dev/null
+++ b/scripts/ni.sh
@@ -0,0 +1,6 @@
+if [[ $# -ne 1 ]]; then
+  echo "usage: ni <package>"
+  exit 1
+fi
+
+exec nix profile add "nixpkgs#$1"
diff --git a/scripts/theme.sh b/scripts/theme.sh
new file mode 100644
index 0000000..2a1c4fa
--- /dev/null
+++ b/scripts/theme.sh
@@ -0,0 +1,103 @@
+usage() {
+  echo "usage: theme <dark|light|toggle|current>"
+}
+
+read_mode() {
+  if [[ -f "@STATE_FILE@" ]]; then
+    mode=$(tr -d '[:space:]' < "@STATE_FILE@")
+    if [[ "$mode" == "dark" || "$mode" == "light" ]]; then
+      echo "$mode"
+      return
+    fi
+  fi
+
+  echo "@DEFAULT_MODE@"
+}
+
+link_mode_assets() {
+  local mode="$1"
+  local fzf_target
+  local ghostty_target
+  local tmux_target
+  local apple_dark_mode
+
+  case "$mode" in
+    dark)
+      fzf_target="@FZF_DARK_FILE@"
+      ghostty_target="@GHOSTTY_DARK_FILE@"
+      tmux_target="@TMUX_DARK_FILE@"
+      apple_dark_mode=true
+      ;;
+    light)
+      fzf_target="@FZF_LIGHT_FILE@"
+      ghostty_target="@GHOSTTY_LIGHT_FILE@"
+      tmux_target="@TMUX_LIGHT_FILE@"
+      apple_dark_mode=false
+      ;;
+    *)
+      echo "invalid mode: $mode" >&2
+      exit 1
+      ;;
+  esac
+
+  mkdir -p "@STATE_DIR@" "@FZF_DIR@" "@GHOSTTY_DIR@" "@TMUX_DIR@"
+  printf '%s\n' "$mode" > "@STATE_FILE@"
+  ln -sfn "$fzf_target" "@FZF_CURRENT_FILE@"
+  ln -sfn "$ghostty_target" "@GHOSTTY_CURRENT_FILE@"
+  ln -sfn "$tmux_target" "@TMUX_CURRENT_FILE@"
+
+  if command -v tmux >/dev/null 2>&1 && tmux start-server >/dev/null 2>&1; then
+    tmux source-file "@TMUX_CONFIG@" >/dev/null 2>&1 || true
+  fi
+
+  if [[ "$(uname -s)" == "Darwin" ]] && command -v osascript >/dev/null 2>&1; then
+    osascript -e "tell application \"System Events\" to tell appearance preferences to set dark mode to ${apple_dark_mode}" >/dev/null 2>&1 || true
+
+    osascript <<'EOF' >/dev/null 2>&1 || true
+tell application "System Events"
+  if not (exists process "Ghostty") then
+    return
+  end if
+
+  tell process "Ghostty"
+    click menu item "Reload Configuration" of menu 1 of menu bar item "Ghostty" of menu bar 1
+  end tell
+end tell
+EOF
+  fi
+
+  while IFS= read -r socket; do
+    [[ -S "$socket" ]] || continue
+    nvim --server "$socket" --remote-expr "execute('ThemeSync $mode')" >/dev/null 2>&1 || true
+  done < <(
+    {
+      find /tmp -maxdepth 1 -type s -name 'nvim-*.sock' 2>/dev/null
+      find "${TMPDIR:-/tmp}" -type s -path "*/nvim.${USER}/*/nvim.*" 2>/dev/null
+    } | sort -u
+  )
+}
+
+mode="${1:-current}"
+
+case "$mode" in
+  dark|light)
+    ;;
+  toggle)
+    if [[ "$(read_mode)" == "dark" ]]; then
+      mode="light"
+    else
+      mode="dark"
+    fi
+    ;;
+  current)
+    read_mode
+    exit 0
+    ;;
+  *)
+    usage >&2
+    exit 1
+    ;;
+esac
+
+link_mode_assets "$mode"
+printf 'applied %s theme\n' "$mode"
diff --git a/scripts/wtc.sh b/scripts/wtc.sh
new file mode 100644
index 0000000..867c010
--- /dev/null
+++ b/scripts/wtc.sh
@@ -0,0 +1 @@
+exec wt switch --create --base @ "$@"