diff --git a/.gitea/workflows/cd.yaml b/.gitea/workflows/cd.yaml
index ecd356d..11e18fc 100644
--- a/.gitea/workflows/cd.yaml
+++ b/.gitea/workflows/cd.yaml
@@ -291,8 +291,12 @@ jobs:
             echo "ℹ️ Monitoring 設定未變更，略過重新載入"
           fi
 
-      # ── 健康檢查（H3: HTTP + 三容器狀態雙重驗證） ─────────────────────────
+      # ── 健康檢查（H3: HTTP + 三容器 + Phase 34 SPA Shadow 偵測） ──────────
       - name: 健康檢查
+        env:
+          COMMIT_SHA: ${{ steps.commit.outputs.short_sha }}
+          TELEGRAM_BOT_TOKEN: ${{ secrets.TELEGRAM_BOT_TOKEN }}
+          TELEGRAM_CHAT_ID: ${{ secrets.TELEGRAM_CHAT_ID }}
         run: |
           echo "⏳ 等待服務啟動（30s）..."
           sleep 30
@@ -320,6 +324,40 @@ jobs:
                echo "✅ 三容器均正常運行（$RUNNING/3）"; \
              fi'
 
+          # ── Phase 34 SPA Shadow 偵測 — 防 nginx fallback 偽綠 ───────────────
+          # 過去 5 個 deploy（run 273-277）全 success 但 prod 上 Flask 從未接到請求，
+          # 因為 nginx 對 /admin/* 等路徑全 fallback 到 SPA index.html（7480 byte）。
+          # 三條 fingerprint 任一不符 SPA = Flask 真接到：
+          #   (a) Content-Length != 7480
+          #   (b) etag != e167a58a1baf907f55a2925a2e8665d1
+          #   (c) x-process-time header 存在（Flask middleware）
+          echo "🔍 SPA Shadow 偵測（驗 Flask 真接到請求）..."
+          SPA_ETAG='e167a58a1baf907f55a2925a2e8665d1'
+          SPA_LEN='7480'
+          # 用 /health（純 Flask，不會被 SPA 路徑攔）做基準探針
+          HDR=$(curl -sS -D - -o /dev/null --max-time 10 https://mo.wooo.work/health 2>/dev/null || echo "")
+          ETAG=$(echo "$HDR" | grep -i '^etag:' | tr -d '"\r' | awk '{print $2}' | tr 'A-Z' 'a-z')
+          CLEN=$(echo "$HDR" | grep -i '^content-length:' | awk '{print $2}' | tr -d '\r')
+          XPT=$(echo "$HDR" | grep -i '^x-process-time:' | awk '{print $2}' | tr -d '\r')
+          FLASK_OK=0
+          [ -n "$XPT" ] && [ "$XPT" != "0" ] && FLASK_OK=1
+          [ -n "$ETAG" ] && [ "$ETAG" != "$SPA_ETAG" ] && FLASK_OK=1
+          [ -n "$CLEN" ] && [ "$CLEN" != "$SPA_LEN" ] && FLASK_OK=1
+          if [ "$FLASK_OK" != "1" ]; then
+            echo "❌ SPA Shadow 偵測：/health 看似 200 但 nginx fallback 攔截"
+            echo "   etag=$ETAG (SPA=$SPA_ETAG)"
+            echo "   content-length=$CLEN (SPA=$SPA_LEN)"
+            echo "   x-process-time=$XPT （Flask 應 > 0）"
+            # Telegram 告警（如 secrets 已設）
+            if [ -n "${TELEGRAM_BOT_TOKEN}" ] && [ -n "${TELEGRAM_CHAT_ID}" ]; then
+              MSG="🚨 EwoooC SPA Shadow 偵測警告%0A├ commit ${COMMIT_SHA}%0A├ /health 被 nginx SPA fallback 攔截%0A└ 立即查 nginx upstream / Flask container"
+              curl -sS -m 5 -X POST "https://api.telegram.org/bot${TELEGRAM_BOT_TOKEN}/sendMessage" \
+                -d "chat_id=${TELEGRAM_CHAT_ID}" -d "text=${MSG}" -d "parse_mode=HTML" >/dev/null || true
+            fi
+            exit 1
+          fi
+          echo "✅ SPA Shadow OK — Flask 真接到請求（etag=$ETAG xpt=$XPT clen=$CLEN）"
+
       # ── 觸發 Post-Deploy Code Review ─────────────────────────────────────
       - name: 觸發 AI Code Review
         if: success()