diff --git a/eslint.config.js b/eslint.config.js
index dd78a04..b021568 100644
--- a/eslint.config.js
+++ b/eslint.config.js
@@ -1,9 +1,29 @@
+// @ts-check
+
 import js from '@eslint/js'
+import css from '@eslint/css'
 import globals from 'globals'
 import { defineConfig, globalIgnores } from 'eslint/config'
 import stylistic from '@stylistic/eslint-plugin'
 
 export default defineConfig([
+  {
+    files: ['**/*.css'],
+    plugins: {
+      css
+    },
+    languageOptions: {
+      tolerant: true
+    },
+    language: 'css/css',
+    rules: {
+      'css/no-duplicate-imports': 'error',
+      'css/no-empty-blocks': 'error',
+      'css/no-invalid-at-rules': 'error',
+      'css/no-invalid-properties': 'error'
+    },
+    ignores: ['./src/modules/loading/loading.css']
+  },
   {
     files: ['**/*.{js,mjs,cjs}'],
     plugins: { js, '@stylistic': stylistic},
diff --git a/package.json b/package.json
index 9455b75..5fcbd24 100644
--- a/package.json
+++ b/package.json
@@ -25,6 +25,7 @@
     "firebase": "^12.11.0"
   },
   "devDependencies": {
+    "@eslint/css": "^1.1.0",
     "@eslint/js": "^10.0.1",
     "@stylistic/eslint-plugin": "^5.10.0",
     "eslint": "^10.1.0",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 34cb5b6..33fd2a0 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -12,6 +12,9 @@ importers:
         specifier: ^12.11.0
         version: 12.11.0
     devDependencies:
+      '@eslint/css':
+        specifier: ^1.1.0
+        version: 1.1.0
       '@eslint/js':
         specifier: ^10.0.1
         version: 10.0.1(eslint@10.1.0)
@@ -64,6 +67,14 @@ packages:
     resolution: {integrity: sha512-QUPblTtE51/7/Zhfv8BDwO0qkkzQL7P/aWWbqcf4xWLEYn1oKjdO0gglQBB4GAsu7u6wjijbCmzsUTy6mnk6oQ==}
     engines: {node: ^20.19.0 || ^22.13.0 || >=24}
 
+  '@eslint/css-tree@3.6.9':
+    resolution: {integrity: sha512-3D5/OHibNEGk+wKwNwMbz63NMf367EoR4mVNNpxddCHKEb2Nez7z62J2U6YjtErSsZDoY0CsccmoUpdEbkogNA==}
+    engines: {node: ^10 || ^12.20.0 || ^14.13.0 || >=15.0.0}
+
+  '@eslint/css@1.1.0':
+    resolution: {integrity: sha512-sNwfLcU3nKXv/v2YglqujwMU4Iv3BDhxldNUd/2FckVab0zdvc9pPlKWxjR6Ap/EU+Y8Pdu853iwvcUpemRhRw==}
+    engines: {node: ^20.19.0 || ^22.13.0 || >=24}
+
   '@eslint/js@10.0.1':
     resolution: {integrity: sha512-zeR9k5pd4gxjZ0abRoIaxdc7I3nDktoXZk2qOv9gCNWx3mVwEn32VRhyLaRsDiJjTs0xq/T8mfPtyuXu7GWBcA==}
     engines: {node: ^20.19.0 || ^22.13.0 || >=24}
@@ -802,6 +813,9 @@ packages:
   long@5.3.2:
     resolution: {integrity: sha512-mNAgZ1GmyNhD7AuqnTG3/VQ26o760+ZYBPKjPvugO8+nLbYfX6TVpJPseBvopbdY+qpZ/lKUnmEc1LeZYS3QAA==}
 
+  mdn-data@2.23.0:
+    resolution: {integrity: sha512-786vq1+4079JSeu2XdcDjrhi/Ry7BWtjDl9WtGPWLiIHb2T66GvIVflZTBoSNZ5JqTtJGYEVMuFA/lbQlMOyDQ==}
+
   minimatch@10.2.5:
     resolution: {integrity: sha512-MULkVLfKGYDFYejP07QOurDLLQpcjk7Fw+7jXS2R2czRQzR56yHRveU5NDJEOviH+hETZKSkIk5c+T23GjFUMg==}
     engines: {node: 18 || 20 || >=22}
@@ -1045,6 +1059,17 @@ snapshots:
     dependencies:
       '@types/json-schema': 7.0.15
 
+  '@eslint/css-tree@3.6.9':
+    dependencies:
+      mdn-data: 2.23.0
+      source-map-js: 1.2.1
+
+  '@eslint/css@1.1.0':
+    dependencies:
+      '@eslint/core': 1.1.1
+      '@eslint/css-tree': 3.6.9
+      '@eslint/plugin-kit': 0.6.1
+
   '@eslint/js@10.0.1(eslint@10.1.0)':
     optionalDependencies:
       eslint: 10.1.0
@@ -1833,6 +1858,8 @@ snapshots:
 
   long@5.3.2: {}
 
+  mdn-data@2.23.0: {}
+
   minimatch@10.2.5:
     dependencies:
       brace-expansion: 5.0.5