Added more imports

app/Rules/ColorRule.php

@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Rules;
+
+use App\Service\ColorService;
+use Closure;
+use Illuminate\Contracts\Validation\ValidationRule;
+use Illuminate\Translation\PotentiallyTranslatedString;
+
+class ColorRule implements ValidationRule
+{
+    /**
+     * Run the validation rule.
+     *
+     * @param  Closure(string): PotentiallyTranslatedString  $fail
+     */
+    public function validate(string $attribute, mixed $value, Closure $fail): void
+    {
+        if (! is_string($value)) {
+            $fail(__('validation.string'));
+
+            return;
+        }
+        if (! app(ColorService::class)->isValid($value)) {
+            $fail(__('validation.color'));
+
+            return;
+        }
+    }
+}