diff --git a/apps/client/src/features/ai-chat/components/ai-chat.module.css b/apps/client/src/features/ai-chat/components/ai-chat.module.css
index 419fee2f..04572305 100644
--- a/apps/client/src/features/ai-chat/components/ai-chat.module.css
+++ b/apps/client/src/features/ai-chat/components/ai-chat.module.css
@@ -8,6 +8,9 @@
 .messages {
     flex: 1 1 auto;
     min-height: 0;
+    /* Smaller, denser chat text (cascades into user bubble + assistant markdown
+       + tool cards; the explicit-size Mantine labels keep their own size). */
+    font-size: var(--mantine-font-size-sm);
 }
 
 .messageRow {