diff --git a/web/package.json b/web/package.json
index 00beaca..2121a8c 100644
--- a/web/package.json
+++ b/web/package.json
@@ -23,6 +23,7 @@
     "clsx": "^2.1.1",
     "date-fns": "^4.1.0",
     "lucide-react": "^0.525.0",
+    "next-themes": "^0.4.6",
     "papaparse": "^5.5.3",
     "react": "^19.1.0",
     "react-dom": "^19.1.0",
diff --git a/web/pnpm-lock.yaml b/web/pnpm-lock.yaml
index f463e96..ee4bbfb 100644
--- a/web/pnpm-lock.yaml
+++ b/web/pnpm-lock.yaml
@@ -47,6 +47,9 @@ dependencies:
   lucide-react:
     specifier: ^0.525.0
     version: 0.525.0(react@19.1.0)
+  next-themes:
+    specifier: ^0.4.6
+    version: 0.4.6(react-dom@19.1.0)(react@19.1.0)
   papaparse:
     specifier: ^5.5.3
     version: 5.5.3
@@ -1251,7 +1254,7 @@ packages:
 
   /@tailwindcss/oxide@4.1.11:
     resolution: {integrity: sha512-Q69XzrtAhuyfHo+5/HMgr1lAiPP/G40OMFAnws7xcFEYqcypZmdW8eGXaOUIeOl1dzPJBPENXgbjsOyhg2nkrg==}
-    engines: {node: '>= 10'}
+    engines: {node: '>=14.0.0'}
     dependencies:
       detect-libc: 2.0.4
       tar: 7.4.3
@@ -1269,6 +1272,13 @@ packages:
       '@tailwindcss/oxide-win32-arm64-msvc': 4.1.11
       '@tailwindcss/oxide-win32-x64-msvc': 4.1.11
     dev: false
+    bundledDependencies:
+      - '@napi-rs/wasm-runtime'
+      - '@emnapi/core'
+      - '@emnapi/runtime'
+      - '@tybys/wasm-util'
+      - '@emnapi/wasi-threads'
+      - tslib
 
   /@tailwindcss/vite@4.1.11(vite@7.0.4):
     resolution: {integrity: sha512-RHYhrR3hku0MJFRV+fN2gNbDNEh3dwKvY8XJvTxCSXeMOsCRSr+uKvDWQcbizrHgjML6ZmTE5OwMrl5wKcujCw==}
@@ -1848,6 +1858,7 @@ packages:
   /detect-libc@2.0.4:
     resolution: {integrity: sha512-3UDv+G9CsCKO1WKMGw9fwq/SWJYbI0c5Y7LU1AXYoDdbhE2AHQ6N6Nb34sG8Fj7T5APy8qXDCKuuIHd1BR0tVA==}
     engines: {node: '>=8'}
+    requiresBuild: true
     dev: false
 
   /deterministic-object-hash@2.0.2:
@@ -2492,6 +2503,8 @@ packages:
       lightningcss-win32-arm64-msvc: 1.30.1
       lightningcss-win32-x64-msvc: 1.30.1
     dev: false
+    bundledDependencies:
+      - napi-wasm
 
   /longest-streak@3.1.0:
     resolution: {integrity: sha512-9Ri+o0JYgehTaVBBDoMqIl8GXtbWg711O3srftcHhZ0dqnETqLaoIK0x17fUw9rFSlK/0NlsKe0Ahhyl5pXE2g==}
@@ -3117,6 +3130,16 @@ packages:
     engines: {node: '>= 10'}
     dev: false
 
+  /next-themes@0.4.6(react-dom@19.1.0)(react@19.1.0):
+    resolution: {integrity: sha512-pZvgD5L0IEvX5/9GWyHMf3m8BKiVQwsCMHfoFosXtXBMnaS0ZnIJ9ST4b4NqLVKDEm8QBxoNNGNaBv2JNF6XNA==}
+    peerDependencies:
+      react: ^16.8 || ^17 || ^18 || ^19 || ^19.0.0-rc
+      react-dom: ^16.8 || ^17 || ^18 || ^19 || ^19.0.0-rc
+    dependencies:
+      react: 19.1.0
+      react-dom: 19.1.0(react@19.1.0)
+    dev: false
+
   /nlcst-to-string@4.0.0:
     resolution: {integrity: sha512-YKLBCcUYKAg0FNlOBT6aI91qFmSiFKiluk655WzPF+DDMA02qIyy8uiRqI8QXtcFpEvll12LpL5MXqEmAZ+dcA==}
     dependencies: