diff --git a/app.js b/app.js
index 3afbaeb..7f28c48 100644
--- a/app.js
+++ b/app.js
@@ -5,6 +5,10 @@ const darkMod = require('./utils/darkMode')
 
 App({
   async onLaunch() {
+    // 尽早设导航栏色 + 窗口背景:原生导航栏在 JS 执行前用 app.json 写死的
+    // 橙色,这里在 onLaunch 第一时间切到用户主题色,缩小冷启动跳变窗口。
+    themeMod.applyChrome()
+
     // Init dark mode listener (refreshes all open pages when system theme changes)
     darkMod.watchDarkMode((isDark) => {
       const pages = getCurrentPages()
@@ -39,9 +43,6 @@ App({
 
     this.globalData.theme = themeMod.getCurrentTheme()
 
-    // 窗口背景色 — 冷启动就设好,避免暗黑模式下切 tab 闪白
-    themeMod.applyWindowBg()
-
     // Sync with cloud: always locate our doc first (pullAll caches
     // _openid / _docId), then either restore or push. The previous flow
     // only pulled when local was empty, so on a cold start with non-empty
diff --git a/utils/theme.js b/utils/theme.js
index 9e991a6..b10d87c 100644
--- a/utils/theme.js
+++ b/utils/theme.js
@@ -130,11 +130,25 @@ const applyWindowBg = () => {
   } catch (e) {}
 }
 
+/**
+ * 冷启动尽早调用:设导航栏色 + 窗口背景。
+ * 原生导航栏在 JS 执行前用 app.json 写死的橙色,这里在 onLaunch 第一时间
+ * 切到用户主题色,把冷启动橙->主题色的跳变窗口压到最小(无法完全消除,
+ * 因为 app.json 静态值在 onLaunch 之前就已应用)。
+ */
+const applyChrome = () => {
+  try {
+    _setNavBarColor(getCurrentTheme().primary)
+    applyWindowBg()
+  } catch (e) {}
+}
+
 module.exports = {
   THEMES,
   DEFAULT_THEME_ID,
   BASE_VARS,
   applyWindowBg,
+  applyChrome,
   getThemeById,
   getCurrentTheme,
   setTheme,