diff --git a/index.html b/index.html
index a107af0..769a1b8 100644
--- a/index.html
+++ b/index.html
@@ -37,8 +37,8 @@
     --ok-bg:#E7F4EE;
     --shadow:0 1px 2px rgba(20,26,34,.06),0 8px 24px rgba(20,26,34,.06);
     --radius:10px;
-    /* 正文行宽：中文按 em 计（1em ≈ 1 个汉字），约 44 字/行 */
-    --measure:44em;
+    /* 正文行宽：中文按 em 计（1em ≈ 1 个汉字），约 56 字/行 */
+    --measure:56em;
     --sans:"IBM Plex Sans","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
     --mono:"IBM Plex Mono","SF Mono",ui-monospace,"PingFang SC",monospace;
   }