diff --git a/.vitepress/theme/components/CustomHeader.vue b/.vitepress/theme/components/CustomHeader.vue
index 3ed238b..d78e487 100644
--- a/.vitepress/theme/components/CustomHeader.vue
+++ b/.vitepress/theme/components/CustomHeader.vue
@@ -577,6 +577,10 @@ watch(
 
 .logo-icon {
   height: 32px;
+  /* 避免全局 img { max-width: 100% } 导致 logo 在窄屏时被压缩 */
+  max-width: none;
+  /* 保证在某些布局下不会被最小宽度约束影响 */
+  min-width: 0;
 }
 
 .logo-text {
@@ -749,6 +753,12 @@ watch(
 }
 
 @media (max-width: 979px) {
+  /* 移动端适配：窄屏时使用较小的 logo，避免溢出 */
+  .mb-logo .logo-icon {
+    width: 160px;
+    height: 26px;
+    max-width: none;
+  }
   .header-top {
     display: none;
   }