diff --git a/webapp/static/css/app.css b/webapp/static/css/app.css
index 73f450f..645b1dd 100644
--- a/webapp/static/css/app.css
+++ b/webapp/static/css/app.css
@@ -310,6 +310,7 @@ table.group-table td { border-bottom: 1px solid #f1f5f9; font-variant-numeric: t
 
 /* ---------- API 文档 iframe ---------- */
 #view-apidocs { padding: 0; display: flex; flex-direction: column; flex: 1; }
+#view-apidocs[hidden] { display: none; }
 .apidocs-frame {
   flex: 1;
   width: 100%;
@@ -404,6 +405,7 @@ table.group-table td { border-bottom: 1px solid #f1f5f9; font-variant-numeric: t
   .app { display: block; }
   .main { display: block; width: 100%; }
   .view { padding: 0; display: block !important; }
+  #view-apidocs { display: none !important; }  /* never print the API docs iframe */
   #view-report { display: block !important; }
 
   /* ── 报告内容 ── */