diff --git a/client/scripts/player.gd b/client/scripts/player.gd
index 675271a..bf980a9 100644
--- a/client/scripts/player.gd
+++ b/client/scripts/player.gd
@@ -728,7 +728,15 @@ static func idle_support_is_stable(
 ) -> bool:
 	if not on_floor:
 		return false
-	if floor_normal.dot(Vector3.UP) < min_flat_up_dot:
+	var ridged: bool = idle_slide_contacts_are_ridged(slide_normals)
+	# Entering stable idle uses [member STABLE_IDLE_FLOOR_MIN_UP_DOT] (0.998). On stair treads,
+	# [code]get_floor_normal()[/code] often sits ~0.996–0.997 with a riser contact — never latches,
+	# so idle stays in corrective [method _maybe_idle_rim_settle_nudge] + [method _physics_idle_tick]
+	# forever (HUD jitter while **not** walking). Use the latched hold threshold (0.992) when ridged.
+	var required_up: float = min_flat_up_dot
+	if ridged and min_flat_up_dot >= STABLE_IDLE_FLOOR_MIN_UP_DOT - 1e-6:
+		required_up = STABLE_IDLE_FLOOR_HOLD_MIN_UP_DOT
+	if floor_normal.dot(Vector3.UP) < required_up:
 		return false
 	# Post-stop **ridged** slides (tread + riser) used to force unstable idle for the entire
 	# `loose_ticks` window even when the **floor** is level — e.g. idle on a flat approach tread
@@ -737,7 +745,7 @@ static func idle_support_is_stable(
 	# proximity to a riser on an otherwise flat tread.
 	if (
 		loose_ticks > 0
-		and idle_slide_contacts_are_ridged(slide_normals)
+		and ridged
 		and floor_normal.dot(Vector3.UP) < IDLE_RIM_MIN_FLOOR_UP_DOT
 	):
 		return false