diff --git a/.github/workflows/quality.yaml b/.github/workflows/quality.yaml
index e43f71c..d7be890 100644
--- a/.github/workflows/quality.yaml
+++ b/.github/workflows/quality.yaml
@@ -11,6 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     outputs:
       lua: ${{ steps.changes.outputs.lua }}
+      python: ${{ steps.changes.outputs.python }}
       markdown: ${{ steps.changes.outputs.markdown }}
     steps:
       - uses: actions/checkout@v4
@@ -24,7 +25,10 @@ jobs:
               - '*.lua'
               - '.luarc.json'
               - '*.toml'
-              - 'vim.yaml'
+            python:
+              - 'scripts/**/*.py'
+              - 'pyproject.toml'
+              - 'uv.lock'
             markdown:
               - '*.md'
 
@@ -35,8 +39,11 @@ jobs:
     if: ${{ needs.changes.outputs.lua == 'true' }}
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v31
-      - run: nix develop --command stylua --check .
+      - uses: JohnnyMorganz/stylua-action@v4
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          version: 2.1.0
+          args: --check .
 
   lua-lint:
     name: Lua Lint Check
@@ -45,8 +52,11 @@ jobs:
     if: ${{ needs.changes.outputs.lua == 'true' }}
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v31
-      - run: nix develop --command selene --display-style quiet .
+      - name: Lint with Selene
+        uses: NTBBloodbath/selene-action@v1.0.0
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          args: --display-style quiet .
 
   lua-typecheck:
     name: Lua Type Check
@@ -62,6 +72,48 @@ jobs:
           directories: lua
           configpath: .luarc.json
 
+  python-format:
+    name: Python Format Check
+    runs-on: ubuntu-latest
+    needs: changes
+    if: ${{ needs.changes.outputs.python == 'true' }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install uv
+        uses: astral-sh/setup-uv@v4
+      - name: Install ruff
+        run: uv tool install ruff
+      - name: Check Python formatting with ruff
+        run: ruff format --check .
+
+  python-lint:
+    name: Python Lint Check
+    runs-on: ubuntu-latest
+    needs: changes
+    if: ${{ needs.changes.outputs.python == 'true' }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install uv
+        uses: astral-sh/setup-uv@v4
+      - name: Install ruff
+        run: uv tool install ruff
+      - name: Lint Python files with ruff
+        run: ruff check .
+
+  python-typecheck:
+    name: Python Type Check
+    runs-on: ubuntu-latest
+    needs: changes
+    if: ${{ needs.changes.outputs.python == 'true' }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install uv
+        uses: astral-sh/setup-uv@v4
+      - name: Install dependencies with mypy
+        run: uv sync --dev
+      - name: Type check Python files with mypy
+        run: uv run mypy .
+
   markdown-format:
     name: Markdown Format Check
     runs-on: ubuntu-latest
@@ -69,5 +121,15 @@ jobs:
     if: ${{ needs.changes.outputs.markdown == 'true' }}
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v31
-      - run: nix develop --command prettier --check .
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 8
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+      - name: Install prettier
+        run: pnpm add -g prettier@3.1.0
+      - name: Check markdown formatting with prettier
+        run: prettier --check .
diff --git a/.gitignore b/.gitignore
index d13bcc9..7451084 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,6 +8,3 @@ venv/
 CLAUDE.md
 __pycache__
 node_modules/
-
-.direnv/
-.envrc
diff --git a/.luarc.json b/.luarc.json
index e240dd5..3ccfeda 100644
--- a/.luarc.json
+++ b/.luarc.json
@@ -1,9 +1,8 @@
 {
-  "runtime.version": "LuaJIT",
+  "runtime.version": "Lua 5.1",
   "runtime.path": ["lua/?.lua", "lua/?/init.lua"],
   "diagnostics.globals": ["vim"],
   "workspace.library": ["$VIMRUNTIME/lua", "${3rd}/luv/library"],
   "workspace.checkThirdParty": false,
-  "workspace.ignoreDir": [".direnv"],
   "completion.callSnippet": "Replace"
 }
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 3477598..4706ce4 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -9,6 +9,26 @@ repos:
         files: \.lua$
         pass_filenames: true
 
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.14.3
+    hooks:
+      - id: ruff-format
+        name: ruff (format)
+        files: \.py$
+      - id: ruff
+        name: ruff (lint imports)
+        args: ['--fix', '--select=I']
+        files: \.py$
+
+  - repo: local
+    hooks:
+      - id: mypy
+        name: mypy (type check)
+        entry: uv run mypy
+        language: system
+        args: ['.']
+        pass_filenames: false
+
   - repo: https://github.com/pre-commit/mirrors-prettier
     rev: v4.0.0-alpha.8
     hooks:
diff --git a/.styluaignore b/.styluaignore
deleted file mode 100644
index 9b42106..0000000
--- a/.styluaignore
+++ /dev/null
@@ -1 +0,0 @@
-.direnv/
diff --git a/flake.lock b/flake.lock
deleted file mode 100644
index b6f667a..0000000
--- a/flake.lock
+++ /dev/null
@@ -1,43 +0,0 @@
-{
-  "nodes": {
-    "nixpkgs": {
-      "locked": {
-        "lastModified": 1771423170,
-        "narHash": "sha256-K7Dg9TQ0mOcAtWTO/FX/FaprtWQ8BmEXTpLIaNRhEwU=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "bcc4a9d9533c033d806a46b37dc444f9b0da49dd",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "root": {
-      "inputs": {
-        "nixpkgs": "nixpkgs",
-        "systems": "systems"
-      }
-    },
-    "systems": {
-      "locked": {
-        "lastModified": 1681028828,
-        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
-        "owner": "nix-systems",
-        "repo": "default",
-        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-systems",
-        "repo": "default",
-        "type": "github"
-      }
-    }
-  },
-  "root": "root",
-  "version": 7
-}
diff --git a/flake.nix b/flake.nix
deleted file mode 100644
index 18752aa..0000000
--- a/flake.nix
+++ /dev/null
@@ -1,33 +0,0 @@
-{
-  description = "midnight.nvim — a dark colorscheme for Neovim";
-
-  inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
-    systems.url = "github:nix-systems/default";
-  };
-
-  outputs =
-    {
-      nixpkgs,
-      systems,
-      ...
-    }:
-    let
-      forEachSystem =
-        f: nixpkgs.lib.genAttrs (import systems) (system: f nixpkgs.legacyPackages.${system});
-    in
-    {
-      formatter = forEachSystem (pkgs: pkgs.nixfmt-tree);
-
-      devShells = forEachSystem (pkgs: {
-        default = pkgs.mkShell {
-          packages = [
-            pkgs.prettier
-            pkgs.stylua
-            pkgs.selene
-            pkgs.lua-language-server
-          ];
-        };
-      });
-    };
-}
diff --git a/lua/midnight/init.lua b/lua/midnight/init.lua
index 41d066f..50a83ba 100644
--- a/lua/midnight/init.lua
+++ b/lua/midnight/init.lua
@@ -1,14 +1,7 @@
 local M = {}
 
-local loading = false
-
 ---@return nil
 function M.load()
-  if loading then
-    return
-  end
-  loading = true
-
   if vim.g.colors_name then
     vim.cmd('hi clear')
   end
@@ -22,21 +15,6 @@ function M.load()
 
   local theme = require('midnight.theme')
   theme.apply()
-
-  loading = false
-end
-
----@deprecated Use `vim.cmd('colorscheme midnight')` instead
-function M.setup(_opts)
-  vim.deprecate(
-    'require("midnight").setup()',
-    'vim.cmd("colorscheme midnight")',
-    'v0.1.0',
-    'midnight.nvim',
-    false
-  )
-
-  M.load()
 end
 
 return M
diff --git a/lua/midnight/theme.lua b/lua/midnight/theme.lua
index 1fbfa02..25a7a15 100644
--- a/lua/midnight/theme.lua
+++ b/lua/midnight/theme.lua
@@ -121,13 +121,9 @@ function M.apply()
 
   hi('@variable', { none = true })
 
-  hi('Pmenu', { fg = cs.background, bg = cs.foreground }, { 'PmenuSbar' })
+  hi('Pmenu', { bg = cs.dark_grey }, { 'PmenuSbar' })
   hi('PmenuSel', { bg = cs.med_grey })
   hi('PmenuThumb', { bg = cs.grey })
-  hi('BlinkCmpMenu', { fg = cs.background, bg = cs.foreground })
-  hi('BlinkCmpMenuBorder', { fg = cs.background, bg = cs.foreground })
-  hi('BlinkCmpDoc', { fg = cs.background, bg = cs.foreground })
-  hi('BlinkCmpDocBorder', { fg = cs.background, bg = cs.foreground })
 
   hi('LspInlayHint', { fg = cs.light_black })
   hi('LspSignatureActiveParameter', { underline = true, italic = true })
@@ -149,13 +145,7 @@ function M.apply()
 
   hi('gitCommitSummary', { fg = cs.background })
 
-  hi('@attribute.diff', { fg = cs.blue })
-  hi('@diff.minus', { fg = cs.red })
-  hi('@diff.plus', { fg = cs.green })
-  hi('@diff.delta', { fg = cs.blue })
-  hi('@punctuation.special.diff', { fg = cs.blue })
-
-  link('Normal', { '@string.special.path', '@variable.parameter' })
+  hi('@attribute.diff', { fg = cs.background })
   hi('DiffAdd', { bg = cs.diff_add, fg = cs.green }, { '@text.diff.add', 'diffAdded' })
   hi('DiffDelete', { bg = cs.diff_delete, fg = cs.red }, { '@text.diff.delete', 'diffRemoved' })
   hi('DiffChange', { bg = cs.diff_change, fg = cs.blue })
@@ -169,12 +159,10 @@ function M.apply()
   hi('@constructor.lua', { fg = cs.background })
   hi('@markup.heading.gitcommit', { none = true })
 
-  hi('@function.latex', { fg = cs.blue })
-
   hi('GitSignsCurrentLineBlame', { italic = true, fg = cs.light_black })
-  hi('GitSignsAdd', { fg = cs.green })
-  hi('GitSignsChange', { fg = cs.blue })
-  hi('GitSignsDelete', { fg = cs.red })
+  link('DiffAdd', 'GitSignsAdd')
+  link('DiffChange', 'GitSignsChange')
+  link('DiffDelete', 'GitSignsDelete')
 
   link('Search', 'HighlightUndo')
 
@@ -183,23 +171,6 @@ function M.apply()
   hi('CmpItemAbbr', { fg = cs.background })
   hi('CmpItemAbbrMatch', { fg = cs.background, bold = true })
   hi('CmpItemAbbrMatchFuzzy', { fg = cs.background, bold = true })
-  hi('BlinkCmpLabelMatch', { fg = cs.green })
-  hi('BlinkCmpGhostText', { fg = cs.light_black })
-  hi('BlinkCmpGitKindMR', { fg = cs.magenta })
-  hi('BlinkCmpGitKindPR', { fg = cs.magenta })
-  hi('BlinkCmpGitKindIssue', { fg = cs.magenta })
-  hi('BlinkCmpGitKindCommit', { fg = cs.magenta })
-  hi('BlinkCmpGitKindMention', { fg = cs.magenta })
-  hi('BlinkCmpGitKindIconMR', { fg = cs.magenta })
-  hi('BlinkCmpGitKindIconPR', { fg = cs.magenta })
-  hi('BlinkCmpGitKindIconIssue', { fg = cs.magenta })
-  hi('BlinkCmpGitKindIconCommit', { fg = cs.magenta })
-  hi('BlinkCmpGitKindIconMention', { fg = cs.magenta })
-  hi('BlinkCmpGitLabelMRId', { fg = cs.magenta })
-  hi('BlinkCmpGitLabelPRId', { fg = cs.magenta })
-  hi('BlinkCmpGitLabelIssueId', { fg = cs.magenta })
-  hi('BlinkCmpGitLabelCommitId', { fg = cs.magenta })
-  hi('BlinkCmpGitLabelMentionId', { fg = cs.magenta })
   hi('CmpItemAbbrDeprecated', { fg = cs.light_black, strikethrough = true })
   hi('CmpItemMenu', { fg = cs.light_black })
 
diff --git a/scripts/ci.sh b/scripts/ci.sh
deleted file mode 100755
index 18dc321..0000000
--- a/scripts/ci.sh
+++ /dev/null
@@ -1,9 +0,0 @@
-#!/bin/sh
-set -eu
-
-nix develop --command stylua --check .
-git ls-files '*.lua' | xargs nix develop --command selene --display-style quiet
-nix develop --command prettier --check .
-nix fmt
-git diff --exit-code -- '*.nix'
-nix develop --command lua-language-server --check . --checklevel=Warning
diff --git a/selene.toml b/selene.toml
index f2ada4b..96cf5ab 100644
--- a/selene.toml
+++ b/selene.toml
@@ -1,4 +1 @@
 std = 'vim'
-
-[lints]
-bad_string_escape = 'allow'
diff --git a/vim.toml b/vim.toml
new file mode 100644
index 0000000..8bf26ea
--- /dev/null
+++ b/vim.toml
@@ -0,0 +1,30 @@
+[selene]
+base = "lua51"
+name = "vim"
+
+[vim]
+any = true
+
+[jit]
+any = true
+
+[assert]
+any = true
+
+[describe]
+any = true
+
+[it]
+any = true
+
+[before_each]
+any = true
+
+[after_each]
+any = true
+
+[spy]
+any = true
+
+[stub]
+any = true
diff --git a/vim.yaml b/vim.yaml
deleted file mode 100644
index 3821d25..0000000
--- a/vim.yaml
+++ /dev/null
@@ -1,26 +0,0 @@
----
-base: lua51
-name: vim
-lua_versions:
-  - luajit
-globals:
-  vim:
-    any: true
-  jit:
-    any: true
-  assert:
-    any: true
-  describe:
-    any: true
-  it:
-    any: true
-  before_each:
-    any: true
-  after_each:
-    any: true
-  spy:
-    any: true
-  stub:
-    any: true
-  bit:
-    any: true