diff --git a/deploy.sh b/deploy.sh
index 0b9dded..7529882 100755
--- a/deploy.sh
+++ b/deploy.sh
@@ -4,15 +4,33 @@ set -euo pipefail
 PROJECT_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 cd "$PROJECT_ROOT"
 
-TARGET_BRANCH="${1:-$(git rev-parse --abbrev-ref HEAD)}"
+resolve_default_branch() {
+  local current
+  current="$(git branch --show-current 2>/dev/null || true)"
+  if [[ -n "$current" ]]; then
+    echo "$current"
+    return
+  fi
+
+  local remote_head
+  remote_head="$(git symbolic-ref --short refs/remotes/origin/HEAD 2>/dev/null || true)"
+  if [[ -n "$remote_head" ]]; then
+    echo "${remote_head#origin/}"
+    return
+  fi
+
+  echo "main"
+}
+
+TARGET_BRANCH="${1:-$(resolve_default_branch)}"
 
 echo "==> Deploy directory: $PROJECT_ROOT"
 echo "==> Target branch: $TARGET_BRANCH"
 
 if [[ -n "$(git status --porcelain)" ]]; then
-  echo "Error: working tree is not clean."
-  echo "Please commit/stash local changes before deployment."
-  exit 1
+  STASH_NAME="auto-deploy-$(date +%Y%m%d-%H%M%S)"
+  echo "==> Working tree is not clean, auto stashing: $STASH_NAME"
+  git stash push -u -m "$STASH_NAME" >/dev/null
 fi
 
 echo "==> Fetching remote updates..."