diff --git a/assets/css/frontend/base.css b/assets/css/frontend/base.css
index 6d6ef2a1..5508fd13 100644
--- a/assets/css/frontend/base.css
+++ b/assets/css/frontend/base.css
@@ -112,6 +112,24 @@ main.container,
   font-size: 12px;
 }
 
+/* Keep the header multifunction search stable across route-specific CSS.
+ * Some routes load a later .abs-right utility, while the global input focus
+ * ring looks like an extra border against this transparent pill field. */
+.header-slider-search .line-form-input:focus,
+.header-slider-search .line-form-input:focus-visible {
+  border: 0;
+  outline: 0;
+  box-shadow: none;
+}
+
+.header-slider-search .line-form .abs-right {
+  position: absolute;
+  right: 0.7em;
+  top: 50%;
+  transform: translateY(-50%);
+  margin-top: 0;
+}
+
 @media (min-width: 576px) {
   .container,
   main.container {
diff --git a/tests/widget-system/page-display-contract.test.cjs b/tests/widget-system/page-display-contract.test.cjs
index 63ff512b..4338c825 100644
--- a/tests/widget-system/page-display-contract.test.cjs
+++ b/tests/widget-system/page-display-contract.test.cjs
@@ -190,6 +190,17 @@ test('footer brand icons keep the Brands font when legacy fa prefix is present',
   assert.match(icons, /'wechat'\s*=>\s*'fa fab fa-weixin'/)
 })
 
+test('header multifunction search keeps focus and submit alignment route-independent', () => {
+  assert.match(
+    frontendBaseCss,
+    /\.header-slider-search \.line-form-input:focus,[\s\S]*?\.header-slider-search \.line-form-input:focus-visible\s*\{[^}]*border:\s*0;[^}]*outline:\s*0;[^}]*box-shadow:\s*none;/,
+  )
+  assert.match(
+    frontendBaseCss,
+    /\.header-slider-search \.line-form \.abs-right\s*\{[^}]*position:\s*absolute;[^}]*right:\s*0\.7em;[^}]*top:\s*50%;[^}]*transform:\s*translateY\(-50%\);[^}]*margin-top:\s*0;/,
+  )
+})
+
 test('save contract rejects invalid input and round-trips canonical nested values', () => {
   const result = spawnSync(process.env.PHP_BINARY || 'php', [path.join(__dirname, 'page-display-save-harness.php')], {
     cwd: root,