diff --git a/.gitea/workflows/ci.yaml b/.gitea/workflows/ci.yaml
index 6eed5d3..1c50425 100644
--- a/.gitea/workflows/ci.yaml
+++ b/.gitea/workflows/ci.yaml
@@ -27,3 +27,4 @@ jobs:
       - run: pnpm test
       - run: pnpm build
       - run: pnpm check:size
+      - run: pnpm check:colors
diff --git a/web/package.json b/web/package.json
index be54783..3ad401b 100644
--- a/web/package.json
+++ b/web/package.json
@@ -14,6 +14,7 @@
     "lint": "eslint .",
     "gen:api": "openapi-typescript http://localhost:8080/api-docs/openapi.json -o src/api/schema.d.ts",
     "check:size": "node scripts/check-bundle-size.mjs",
+    "check:colors": "node scripts/check-no-raw-colors.mjs",
     "storybook": "storybook dev -p 6006",
     "build-storybook": "storybook build"
   },
diff --git a/web/scripts/check-no-raw-colors.mjs b/web/scripts/check-no-raw-colors.mjs
new file mode 100644
index 0000000..e2bc9d6
--- /dev/null
+++ b/web/scripts/check-no-raw-colors.mjs
@@ -0,0 +1,42 @@
+// Fails if any raw Tailwind color utility appears outside src/components/ui/.
+import { readdirSync, readFileSync } from "node:fs";
+import { join, relative } from "node:path";
+
+const root = "src";
+const excludeDir = join("src", "components", "ui");
+const RAW_COLOR =
+  /(?:text|bg|border|ring|fill|stroke|from|to|via|decoration|outline|divide|placeholder)-(?:neutral|gray|slate|zinc|stone|red|orange|amber|yellow|lime|green|emerald|teal|cyan|sky|blue|indigo|violet|purple|fuchsia|pink|rose)-(?:50|100|200|300|400|500|600|700|800|900|950)\b/;
+
+function walk(dir) {
+  const files = [];
+  for (const entry of readdirSync(dir, { withFileTypes: true })) {
+    const path = join(dir, entry.name);
+    if (entry.isDirectory()) {
+      if (path === excludeDir) continue;
+      files.push(...walk(path));
+    } else if (entry.name.endsWith(".ts") || entry.name.endsWith(".tsx")) {
+      files.push(path);
+    }
+  }
+  return files;
+}
+
+const files = walk(root);
+const offenses = [];
+for (const file of files) {
+  const lines = readFileSync(file, "utf8").split("\n");
+  for (let i = 0; i < lines.length; i++) {
+    const match = RAW_COLOR.exec(lines[i]);
+    if (match) offenses.push(`${relative(".", file)}:${i + 1}: ${match[0]}`);
+  }
+}
+
+if (offenses.length > 0) {
+  console.error(
+    `raw color utilities found outside components/ui/ (${offenses.length}):`,
+  );
+  for (const offense of offenses) console.error(`  ${offense}`);
+  process.exit(1);
+}
+
+console.log(`no raw color utilities outside components/ui/ (${files.length} files scanned)`);