diff --git a/public/css/admin-base.css b/public/css/admin-base.css
index aaef234..44a0f7e 100644
--- a/public/css/admin-base.css
+++ b/public/css/admin-base.css
@@ -203,6 +203,7 @@ textarea.w-full,input.w-full{width:100%;}
 .w-120{width:120px;}
 .w-140{width:140px;}
 .w-160{width:160px;}
+.w-180{width:180px;}
 .w-200{width:200px;}
 
 input.w-90{width:90px;}
diff --git a/tests/Feature/AdminBaseCssShouldIncludeW180WidthUtilityTest.php b/tests/Feature/AdminBaseCssShouldIncludeW180WidthUtilityTest.php
new file mode 100644
index 0000000..51d00a7
--- /dev/null
+++ b/tests/Feature/AdminBaseCssShouldIncludeW180WidthUtilityTest.php
@@ -0,0 +1,32 @@
+<?php
+
+namespace Tests\Feature;
+
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AdminBaseCssShouldIncludeW180WidthUtilityTest extends TestCase
+{
+    use RefreshDatabase;
+
+    protected function loginAsPlatformAdmin(): void
+    {
+        $this->seed();
+
+        $this->post('/admin/login', [
+            'email' => 'platform.admin@demo.local',
+            'password' => 'Platform@123456',
+        ])->assertRedirect('/admin');
+    }
+
+    public function test_admin_base_css_should_include_w180_width_utility(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $css = file_get_contents(public_path('css/admin-base.css'));
+        $this->assertIsString($css);
+
+        // 平台订单筛选区使用 w-180（created_from/to），必须提供该工具类避免样式缺失。
+        $this->assertStringContainsString('.w-180{width:180px;}', $css);
+    }
+}