diff --git a/web/website/src/styles/site-extra.css b/web/website/src/styles/site-extra.css
index 4020b43..c113b7b 100644
--- a/web/website/src/styles/site-extra.css
+++ b/web/website/src/styles/site-extra.css
@@ -217,6 +217,9 @@
 .invite-hero {
   margin-top: 8px;
   max-width: 440px;
+  /* 长标题窄卡易出孤字折行(「…穿山甲/甲」):字号收一档 + balance 均衡断行 */
+  font-size: clamp(24px, 4.6vw, 30px);
+  text-wrap: balance;
 }
 .invite-code-box {
   width: 100%;
@@ -366,6 +369,9 @@
 .register-hero {
   margin-top: 8px;
   max-width: 420px;
+  /* 同 .invite-hero:防「…3 天/天」孤字折行 */
+  font-size: clamp(24px, 4.6vw, 30px);
+  text-wrap: balance;
 }
 .register-form {
   width: 100%;