diff --git a/firmware/components/display-classic.yaml b/firmware/components/display-classic.yaml
index e8382de..167ff69 100644
--- a/firmware/components/display-classic.yaml
+++ b/firmware/components/display-classic.yaml
@@ -172,9 +172,13 @@ lvgl:
                         id: cool_arc
                         align: center
                         y: -20
-                        width: 400px    # same radius as heat_arc — concentric, same-size rings by request.
-                        height: 400px   # touch disambiguation is handled entirely by adv_hittest below, not
-                                        # by radius difference, so same-size rings still target correctly.
+                        width: 360px    # smaller radius than heat_arc (400px) so the two rings are physically
+                        height: 360px   # distinct. LVGL's adv_hittest arc hit test only accepts touches within
+                                        # the arc's own ring band (radius - arc_width to radius, in its angular
+                                        # span) — confirmed via lv_arc.c LV_EVENT_HIT_TEST. Same-radius arcs
+                                        # occupy an identical ring band, so adv_hittest alone CANNOT disambiguate
+                                        # them (verified on hardware: making both 400px left only the topmost,
+                                        # cool_arc, draggable). Differing radii are required, not optional.
                         start_angle: 315
                         end_angle: 225
                         mode: REVERSE