diff --git a/services/web-ui/nginx.conf b/services/web-ui/nginx.conf
index d9454e3..c1a2caf 100644
--- a/services/web-ui/nginx.conf
+++ b/services/web-ui/nginx.conf
@@ -18,16 +18,17 @@ server {
     # Root location - serve static files
     root /usr/share/nginx/html;
 
-    # Cache static assets aggressively
-    location ~* \.(css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
+    # Fonts, icons, images: rarely change, safe to cache aggressively.
+    location ~* \.(png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
         expires 1y;
         add_header Cache-Control "public, immutable";
     }
 
-    # JS files — must revalidate so a redeploy is picked up immediately.
-    # The static index.html links api.js with a ?v=N query string anyway,
-    # but defence-in-depth: never let a stale .js sit in a browser cache.
-    location ~* \.js$ {
+    # CSS / JS — must revalidate so a redeploy is picked up immediately.
+    # The index.html links these without a version query string, so without
+    # this rule a stale stylesheet/script sits in the browser cache forever
+    # (which produced the unstyled calendar that triggered this fix).
+    location ~* \.(css|js)$ {
         expires -1;
         add_header Cache-Control "no-cache, must-revalidate";
     }