diff --git a/public/css/admin.css b/public/css/admin.css
index 57297f1..a29a41f 100644
--- a/public/css/admin.css
+++ b/public/css/admin.css
@@ -1 +1 @@
-body{background:#020617}a{color:#60a5fa}.layout{grid-template-columns:260px 1fr}.sidebar{background:#0f172a;border-right:1px solid #1e293b}.sidebar a:hover{background:#1e293b}.card{background:#111827}.grid{grid-template-columns:repeat(5,1fr)}.badge{background:#1d4ed8;color:#dbeafe}.danger{background:#7f1d1d;color:#fecaca}.button-danger{background:#7f1d1d;color:#fecaca}.card-login{background:#111827;border:1px solid #334155}
\ No newline at end of file
+body{background:#020617}a{color:#60a5fa}.layout{grid-template-columns:260px 1fr}.sidebar{background:#0f172a;border-right:1px solid #1e293b}.sidebar a:hover{background:#1e293b}.card{background:#111827}.grid{grid-template-columns:repeat(5,1fr)}.badge{background:#1d4ed8;color:#dbeafe}.danger{background:#7f1d1d;color:#fecaca}.button-danger{background:#7f1d1d;color:#fecaca}.card-login{background:#111827;border:1px solid #334155}.layout.layout-topnav{grid-template-columns:1fr;grid-template-rows:auto 1fr}.layout.layout-topnav .sidebar{position:sticky;top:0;z-index:50;padding:16px 20px;border-right:none !important;border-bottom:1px solid #22384f}.layout.layout-topnav .content{padding-top:20px}
\ No newline at end of file
diff --git a/tests/Feature/AdminLayoutTopNavShouldNotUseLegacyGridTest.php b/tests/Feature/AdminLayoutTopNavShouldNotUseLegacyGridTest.php
new file mode 100644
index 0000000..0e4c697
--- /dev/null
+++ b/tests/Feature/AdminLayoutTopNavShouldNotUseLegacyGridTest.php
@@ -0,0 +1,33 @@
+<?php
+
+namespace Tests\Feature;
+
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AdminLayoutTopNavShouldNotUseLegacyGridTest 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_dashboard_should_use_topnav_layout_class(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $res = $this->get('/admin');
+        $res->assertOk();
+
+        $html = (string) $res->getContent();
+
+        $this->assertStringContainsString('layout-topnav', $html);
+    }
+}