diff --git a/tests/Feature/StylesheetsTest.php b/tests/Feature/StylesheetsTest.php
index 82e51dc4..ab086f55 100644
--- a/tests/Feature/StylesheetsTest.php
+++ b/tests/Feature/StylesheetsTest.php
@@ -3,6 +3,7 @@
 use Illuminate\Support\Collection;
 use Illuminate\Support\Facades\File;
 use NoNameWeb\LivewireMaterial\Support\Layout;
+use NoNameWeb\LivewireMaterial\Support\Stylesheets;
 use NoNameWeb\LivewireMaterial\Testing\DesignGuard;
 
 /**
@@ -772,3 +773,19 @@ it('shapes showcase.css like a package stylesheet, with its documented unlayered
         }
     }
 });
+
+it('keeps all.css under a gzip size budget, measured through Stylesheets::bundle()', function () {
+    // 106,838 bytes gzipped today (2026-09-15), rounded up by about 10% to a number CI can hold
+    // to without Node: PHP's own gzencode() on the same bytes Stylesheets::bundle() serves the
+    // showcase and the error page's fallback. A little organic growth should not retrigger this
+    // on every commit; a real jump means look at what grew since the budget was last raised.
+    $budget = 120_000;
+
+    $gzipped = strlen((string) gzencode(Stylesheets::bundle([stylesheetPath('all.css')]), 9));
+
+    expect($gzipped)->toBeLessThanOrEqual($budget, sprintf(
+        'all.css now gzips to %s bytes, over the %s-byte budget — see what grew, and raise the budget deliberately if it should have.',
+        number_format($gzipped),
+        number_format($budget),
+    ));
+});