diff --git a/data/assets/styles.css b/data/assets/styles.css
index ec97f1e0..37881fe2 100644
--- a/data/assets/styles.css
+++ b/data/assets/styles.css
@@ -10422,33 +10422,33 @@ body.ios>iframe {
   color: #fff;
 }
 
-#user-pref>ul {
+#user-pref ul {
   margin-bottom: .55em;
   padding-bottom: .5em;
 }
 
-#user-pref>ul li.btn-group {
+#user-pref ul li.btn-group {
   width: 100%;
   display: block;
   margin-bottom: .75em;
 }
 
-#user-pref>ul li.btn-group:last-child {
+#user-pref ul li.btn-group:last-child {
   margin-bottom: .35em;
 }
 
-#user-pref>ul li.btn-group.option-romanization {
+#user-pref ul li.btn-group.option-romanization {
   display: none;
 }
 
-#user-pref>ul li.btn-group label {
+#user-pref ul li.btn-group label {
   display: block;
   font-weight: 400;
   margin-top: 5px;
   text-shadow: 1px 1px 0 rgba(238,238,238,.7);
 }
 
-#user-pref>ul li.btn-group button {
+#user-pref ul li.btn-group button {
   float: none;
   margin-top: -.4em;
   border-radius: 4px !important;
diff --git a/src/components/navbar-normal.tsx b/src/components/navbar-normal.tsx
index c4855d61..6c233684 100644
--- a/src/components/navbar-normal.tsx
+++ b/src/components/navbar-normal.tsx
@@ -614,10 +614,14 @@ export function NavbarNormal({ currentLang }: NavbarNormalProps) {
     [closeDictionaryDropdown, navigate],
   );
 
-  const handlePrefClick = useCallback((e: React.MouseEvent<HTMLAnchorElement>) => {
-    e.preventDefault();
-    toggleUserPrefPanel();
-  }, []);
+  const handlePrefClick = useCallback(
+    (e: React.MouseEvent<HTMLAnchorElement>) => {
+      e.preventDefault();
+      closeDictionaryDropdown();
+      toggleUserPrefPanel();
+    },
+    [closeDictionaryDropdown],
+  );
 
   /**
    * 語言選項點擊：依照原 press-lang 邏輯計算目標路徑
diff --git a/src/utils/media-cdn.ts b/src/utils/media-cdn.ts
index 5614567c..fd518f01 100644
--- a/src/utils/media-cdn.ts
+++ b/src/utils/media-cdn.ts
@@ -27,7 +27,7 @@ export const ASSET_CDN_BASE = "https://r2-assets.moedict.tw";
  * edge-cached stylesheet key (the original unversioned object at 24h, or a
  * prior `?v=` version still cached at the 5-minute TTL).
  */
-export const LEGACY_STYLESHEET_VERSION = "20260711";
+export const LEGACY_STYLESHEET_VERSION = "20260914";
 
 /** 筆畫 JSON：`${STROKE_JSON_BASE_URL}/{codepoint-hex}.json` */
 export const STROKE_JSON_BASE_URL = `${ASSET_CDN_BASE}/stroke-json`;
diff --git a/tests/e2e/legacy-styles-regression.spec.ts b/tests/e2e/legacy-styles-regression.spec.ts
index 880ae4af..8e206493 100644
--- a/tests/e2e/legacy-styles-regression.spec.ts
+++ b/tests/e2e/legacy-styles-regression.spec.ts
@@ -313,6 +313,35 @@ test.describe("legacy styles.css \u2014 harness self-verification (controls)", (
     ).not.toBe(blankDigest);
   });
 
+  test("pref panel rows stack vertically under the real stylesheet (narrow viewport)", async ({
+    page,
+  }) => {
+    // The React #user-pref markup nests its <ul> inside a wrapper <div>,
+    // so the legacy `#user-pref>ul ...` child-combinator rules never matched
+    // and Bootstrap's `.btn-group { display: inline-block }` tiled the rows
+    // side-by-side (labels merging into one unreadable line) wherever two
+    // rows fit. The rules are now descendant selectors; every settings row
+    // must be block-level regardless of viewport width.
+    await page.setViewportSize({ width: 375, height: 667 });
+    await blockCssSubresources(page);
+    await routeStylesCss(page, readWorkingTreeStylesCss);
+    await page.goto("/%E8%90%8C");
+    await settle(page, "dictionary-lang");
+    const displays = await page.evaluate(() => {
+      const rows = Array.from(document.querySelectorAll("#user-pref li.btn-group"));
+      return {
+        count: rows.length,
+        displays: rows.map((li) => window.getComputedStyle(li).display),
+        labelDisplays: rows.map(
+          (li) => window.getComputedStyle(li.querySelector("label")!).display,
+        ),
+      };
+    });
+    expect(displays.count).toBeGreaterThan(2);
+    expect(displays.displays).toEqual(displays.displays.map(() => "block"));
+    expect(displays.labelDisplays).toEqual(displays.labelDisplays.map(() => "block"));
+  });
+
   test("negative control: a deliberately mutated stylesheet changes both the screenshot and the computed-style digest", async ({
     page,
   }) => {
diff --git a/tests/e2e/preferences.spec.ts b/tests/e2e/preferences.spec.ts
index 64b480c8..b4d6776b 100644
--- a/tests/e2e/preferences.spec.ts
+++ b/tests/e2e/preferences.spec.ts
@@ -53,4 +53,15 @@ test.describe("user preferences (phonetics, pinyin system)", () => {
     await page.evaluate(() => window.localStorage.setItem("pinyin_h", "PFS"));
     expect(await page.evaluate(() => window.localStorage.getItem("pinyin_h"))).toBe("PFS");
   });
+
+  test("opening 偏好設定 closes the dictionary dropdown", async ({ page }) => {
+    await page.goto("/%E8%90%8C");
+    await waitForAppReady(page);
+    await expect(page.getByText("草木初生的芽").first()).toBeVisible({ timeout: 30_000 });
+    await page.locator("ul.nav.navbar-nav > li").first().locator("a").first().click();
+    const firstOption = page.locator("ul.nav.navbar-nav a.lang-option").first();
+    await expect(firstOption).toBeVisible({ timeout: 10_000 });
+    await page.locator("#btn-pref > a").click();
+    await expect(firstOption).toBeHidden({ timeout: 10_000 });
+  });
 });