diff --git a/src/styles/datascreen.css b/src/styles/datascreen.css
index 0971ebd..87a89db 100644
--- a/src/styles/datascreen.css
+++ b/src/styles/datascreen.css
@@ -1293,7 +1293,8 @@
 @media (max-height: 900px) {
   .bd-header { height: 54px; }
   .bd-header-title { font-size: 17px; }
-  .bd-header-sub { display: none; }
+  /* 副标题所有设备保持显示（原 display:none 导致矮屏设备看不到），仅压缩字号 */
+  .bd-header-sub { font-size: 10px; letter-spacing: 0.02em; }
   .bd-clock-time { font-size: 16px; }
   .bd-title { font-size: 12.5px; }
   .bd-kpi-value { font-size: 19px; }