diff --git a/app/src/main/java/com/medithings/vesiscan/ui/views/monitoring/PiezoMonitoringView.kt b/app/src/main/java/com/medithings/vesiscan/ui/views/monitoring/PiezoMonitoringView.kt
index 449c7f5..41dbdc7 100644
--- a/app/src/main/java/com/medithings/vesiscan/ui/views/monitoring/PiezoMonitoringView.kt
+++ b/app/src/main/java/com/medithings/vesiscan/ui/views/monitoring/PiezoMonitoringView.kt
@@ -779,9 +779,19 @@ fun PiezoMonitoringView(appState: AppState) {
             val isWalkingNow = walkSnap.isWalking
 
             // Composite posture — WALKING 이 UNKNOWN/NON_LYING 보다 우선 (자체 게이트 신뢰)
+            // 2026-07-03: acc gate 실패 (UNKNOWN) 시 tilt 로 tentative LYING/NON_LYING 결정.
+            //   왜: 걷기 임팩트로 acc mag > 1.2g → UNKNOWN → 걷는 초반 6초 (walking hold)
+            //       내내 "감지중" chip 이 뜨고, 그 후 갑자기 "걷는중" 으로 점프.
+            //       tilt(=r.pitchDeg) 는 acc gate 와 무관하게 항상 계산되며, 걷기 중에도
+            //       평균 tilt 는 유효 → 최소한 upright 여부 (NON_LYING vs LYING) 는 신뢰 가능.
+            //       Walking 6초 build-up 동안 chip 은 "일어서 있음" (NON_LYING) → 6초 뒤 "걷는중"
+            //       으로 자연스럽게 전이 (감지중 flash 제거).
+            val tiltFallback = if (kotlin.math.abs(r.pitchDeg) > com.medithings.vesiscan.managers.GreenZoneConstants.pitchLyingThreshold)
+                com.medithings.vesiscan.managers.Posture.NON_LYING
+            else com.medithings.vesiscan.managers.Posture.LYING
             val composite = when {
                 isWalkingNow -> com.medithings.vesiscan.managers.Posture.WALKING
-                r.posture == com.medithings.vesiscan.managers.Posture.UNKNOWN -> com.medithings.vesiscan.managers.Posture.UNKNOWN
+                r.posture == com.medithings.vesiscan.managers.Posture.UNKNOWN -> tiltFallback
                 else -> r.posture   // LYING or NON_LYING
             }