diff --git a/src/styles/global.css b/src/styles/global.css
index d424a57..95eaa67 100644
--- a/src/styles/global.css
+++ b/src/styles/global.css
@@ -428,18 +428,15 @@ svg {
     }
   }
 }
+/* Clean monotonic top→bottom pan: as the page scrolls, the board slowly drifts
+   so the motion is always obvious (no wandering loop that nets to zero). ~40% of
+   the 215%-tall image = a long, continuous travel. */
 @keyframes bgPan {
-  0% {
-    transform: translate(-50%, -38%);
+  from {
+    transform: translate(-50%, -28%);
   }
-  35% {
-    transform: translate(-50%, -62%);
-  }
-  68% {
-    transform: translate(-62%, -62%);
-  }
-  100% {
-    transform: translate(-62%, -38%);
+  to {
+    transform: translate(-50%, -72%);
   }
 }