diff --git a/start.sh b/start.sh
index 1f2abf2..f7fcdb7 100755
--- a/start.sh
+++ b/start.sh
@@ -3,14 +3,27 @@
 set -euo pipefail
 cd "$(dirname "$0")"
 
-LAN_IP=$(ipconfig getifaddr en0 2>/dev/null || ip -4 addr show 2>/dev/null | grep -oP '(?<=inet\s)\d+(\.\d+){3}' | grep -v '^127\.' | head -1 || echo "")
 PORT=${PORT:-8501}
 
-if [[ -n "$LAN_IP" ]]; then
-    export PUBLIC_BASE_URL="http://${LAN_IP}:${PORT}"
-    echo "[start] PUBLIC_BASE_URL=${PUBLIC_BASE_URL} (자동 감지)"
+# .env 의 PUBLIC_BASE_URL 우선. 비어 있으면 LAN IP 자동 감지.
+ENV_URL=""
+if [[ -f .env ]]; then
+    ENV_URL=$(grep -E '^\s*PUBLIC_BASE_URL\s*=' .env | tail -1 | sed -E 's/^\s*PUBLIC_BASE_URL\s*=\s*//; s/^["'\'']//; s/["'\'']$//' || true)
+fi
+
+if [[ -n "${PUBLIC_BASE_URL:-}" ]]; then
+    echo "[start] PUBLIC_BASE_URL=${PUBLIC_BASE_URL} (shell env)"
+elif [[ -n "$ENV_URL" ]]; then
+    export PUBLIC_BASE_URL="$ENV_URL"
+    echo "[start] PUBLIC_BASE_URL=${PUBLIC_BASE_URL} (.env)"
 else
-    echo "[start] LAN IP 감지 실패. 어드민에서 PUBLIC_BASE_URL 직접 설정 필요."
+    LAN_IP=$(ipconfig getifaddr en0 2>/dev/null || ip -4 addr show 2>/dev/null | grep -oP '(?<=inet\s)\d+(\.\d+){3}' | grep -v '^127\.' | head -1 || echo "")
+    if [[ -n "$LAN_IP" ]]; then
+        export PUBLIC_BASE_URL="http://${LAN_IP}:${PORT}"
+        echo "[start] PUBLIC_BASE_URL=${PUBLIC_BASE_URL} (LAN 자동 감지)"
+    else
+        echo "[start] PUBLIC_BASE_URL 미설정. 어드민에서 직접 설정 필요."
+    fi
 fi
 
 exec docker compose up -d --build "$@"