diff --git a/src/components/ThemeScript.astro b/src/components/ThemeScript.astro
index e3ab50b..6d2d56f 100644
--- a/src/components/ThemeScript.astro
+++ b/src/components/ThemeScript.astro
@@ -3,7 +3,10 @@
 // 优先级：用户手选(localStorage) > 系统偏好；切换按钮（T7 键盘/组件）写同一 key。
 ---
 
-<script is:inline>
+<script is:inline data-astro-rerun>
+  // data-astro-rerun：ClientRouter 软导航会换 html 属性（data-theme 被新页
+  // 面的无主题态覆盖），内联脚本默认只跑首次——不加重跑标记，切主题后一导航
+  // 就回退系统默认（用户实测报告的 bug）
   (function () {
     var saved = localStorage.getItem('theme');
     var theme = saved === 'light' || saved === 'dark'
diff --git a/tests/e2e.mjs b/tests/e2e.mjs
index 51e2933..51ae76f 100644
--- a/tests/e2e.mjs
+++ b/tests/e2e.mjs
@@ -39,9 +39,14 @@ const before = await page.getAttribute('html', 'data-theme');
 await page.click('[data-theme-toggle]');
 const after = await page.getAttribute('html', 'data-theme');
 ok('明暗切换·按钮', before !== after, `${before}→${after}`);
-await page.reload({ waitUntil: 'networkidle' });
+// 持久化双测：软导航（真实 bug 场景：VT 换页曾把主题抹回默认）+ 刷新
+await page.click('nav a[href="/gallery/"]');
+await page.waitForLoadState('networkidle');
+const softNav = await page.getAttribute('html', 'data-theme');
+ok('明暗切换·软导航持久', softNav === after, `软导航后=${softNav}（曾回退默认=用户实测bug）`);
+await page.goto(BASE + '/', { waitUntil: 'networkidle' });
 const persisted = await page.getAttribute('html', 'data-theme');
-ok('明暗切换·持久化', persisted === after, `reload=${persisted}`);
+ok('明暗切换·刷新持久', persisted === after, `reload=${persisted}`);
 await page.keyboard.press('t');
 const byKey = await page.getAttribute('html', 'data-theme');
 ok('明暗切换·t 键', byKey !== persisted, `t 后=${byKey}`);