diff --git a/src/app/chat/components/chat-input-text-field.module.css b/src/app/chat/components/chat-input-text-field.module.css
index bcdf67c2..780e61a8 100644
--- a/src/app/chat/components/chat-input-text-field.module.css
+++ b/src/app/chat/components/chat-input-text-field.module.css
@@ -24,7 +24,8 @@
   background: transparent;
   color: var(--color-text-foreground, #000); /* Dart: Colors.black */
   caret-color: var(--color-accent, #f84d96); /* Dart: AppColors.accentColor */
-  font-size: var(--font-size-base, 14px);
+  /* iOS Facebook IAB/Safari auto-zooms focused text controls below 16px. */
+  font-size: 16px;
   line-height: 24px;
   resize: none;
   font-family: inherit;