diff --git a/config.py b/config.py
index eaebefa..27d6c46 100644
--- a/config.py
+++ b/config.py
@@ -325,7 +325,7 @@ YOUTUBE_API_KEY = os.getenv('YOUTUBE_API_KEY', '')
 # ==========================================
 # 系統版本與路徑
 # ==========================================
-SYSTEM_VERSION = "V10.377"
+SYSTEM_VERSION = "V10.378"
 LOG_FILE_PATH = os.path.join(BASE_DIR, 'logs/system.log')
 public_url = PUBLIC_URL  # 用於模板顯示
 
diff --git a/docs/memory/history_logs.md b/docs/memory/history_logs.md
index 30bfc96..22dc271 100644
--- a/docs/memory/history_logs.md
+++ b/docs/memory/history_logs.md
@@ -13,6 +13,7 @@
 ## 📅 詳細更新日誌 (考古存檔)
 
 ### 2026-05-21：瀏覽器測試守門與 PChome 熱路徑優化
+- **V10.378 AI 推薦頁首屏 Gemini 防漏**: `/ai_recommend` 首屏狀態快照新增 provider sanitization，即使舊 cache / env 內出現 `default_provider='gemini'` 或 `recommended_provider='gemini'`，也會回到 `ollama`，避免 UI 把 Gemini 顯示成主推薦路徑；`/api/ai/set_provider` 同步正規化 provider 輸入，保留 Gemini 只能作 Ollama 失敗備援的拒絕訊息。
 - **V10.377 Gemini 主路徑防漏補強**: `AIProviderService._get_recommended_provider()` 不再於 Ollama 不通時推薦 `gemini` 作為主提供者；`llm_model_router` 的 `ea_engine` 即使 caller 傳入 `gemini-2.0-flash` default，也會改回 `hermes3:latest`，需要深推理才升 `deepseek-r1:14b`；`ElephantAlphaOrchestrator` 的 OpenClaw registry / system prompt 改為 Ollama-first，避免 L3 HITL prompt 繼續把 Gemini 當主模型描述。同步補 AI SOT 與防回歸測試。
 - **V10.376 Recipe Box 同款防曬漂移比對**: `services/marketplace_product_matcher.py` 對 Recipe Box 多效提亮防曬霜新增 shared identity anchor 加分，當 MOMO 長標含兒童/無毒/天然彩妝等行銷詞、PChome 以「韓兔 多效提亮防曬霜」呈現時仍可判定同款；同步測試鎖住 `shared_identity_anchor_recipe_box_line`，避免平台名稱漂移讓同款價格告警漏報。
 - **V10.375 過期活動爬蟲排程 opt-in**: `run_scheduler.py` 將固定 LPN 的 `edm_task` / `festival_task` 改為 `MOMO_ENABLE_LEGACY_EDM_SCHEDULE=true` 才註冊，季節活動 `mothers_day_2026` / `valentine_520_2026` / `labor_day_2026` 改為 `MOMO_ENABLE_SEASONAL_PROMO_SCHEDULE=true` 才註冊；`services/data/crawler_config.json` 同步暫停已失效的 mothers_day LPN，避免 scheduler 定時打過期 MOMO 活動頁造成 Selenium browser loop 與無效負載。手動 API / CLI 指定 LPN 仍保留；同版整合 NIVEA/OPI 等比價搜尋 noise 與 identity anchor 補強。
diff --git a/routes/ai_routes.py b/routes/ai_routes.py
index 98c06a7..e09c3e9 100644
--- a/routes/ai_routes.py
+++ b/routes/ai_routes.py
@@ -45,15 +45,35 @@ ai_history_service = AIHistoryService()
 ai_template_service = AITemplateService()
 
 
+def _safe_primary_provider(provider: str | None) -> str:
+    normalized = (provider or 'ollama').strip().lower()
+    if normalized == 'gemini':
+        return 'ollama'
+    if normalized in ('ollama', 'elephant'):
+        return normalized
+    return 'ollama'
+
+
+def _safe_recommended_provider(provider: str | None) -> str:
+    """Initial render must never advertise Gemini as a primary provider."""
+    normalized = _safe_primary_provider(provider)
+    return normalized if normalized in ('ollama', 'elephant') else 'none'
+
+
 def _get_ai_status_for_initial_render():
     """取得首屏用 AI 狀態快照，不做同步網路健康檢查。"""
     status_cache = getattr(ai_provider_service, '_status_cache', {}) or {}
     cached_status = status_cache.get('data')
     if cached_status:
+        cached_status = dict(cached_status)
+        cached_status['default_provider'] = _safe_primary_provider(cached_status.get('default_provider'))
+        cached_status['recommended_provider'] = _safe_recommended_provider(
+            cached_status.get('recommended_provider') or cached_status.get('default_provider')
+        )
         return cached_status
 
     default_model = getattr(ollama_service, 'model', None) or 'gemma3:4b'
-    default_provider = getattr(ai_provider_service, 'default_provider', 'ollama')
+    default_provider = _safe_primary_provider(getattr(ai_provider_service, 'default_provider', 'ollama'))
     return {
         'default_provider': default_provider,
         'ollama': {
@@ -77,7 +97,7 @@ def _get_ai_status_for_initial_render():
             'type': 'cloud',
             'cost': 'efficient',
         },
-        'recommended_provider': default_provider,
+        'recommended_provider': _safe_recommended_provider(default_provider),
         'timestamp': None,
     }
 
@@ -122,7 +142,7 @@ def api_set_provider():
     """切換預設 AI 提供者"""
     try:
         data = request.get_json()
-        provider = data.get('provider', 'ollama')
+        provider = (data.get('provider', 'ollama') or 'ollama').strip().lower()
 
         if provider == 'gemini':
             return jsonify({
diff --git a/tests/test_ai_routes_ollama_first.py b/tests/test_ai_routes_ollama_first.py
new file mode 100644
index 0000000..09bde44
--- /dev/null
+++ b/tests/test_ai_routes_ollama_first.py
@@ -0,0 +1,41 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""AI recommendation route Ollama-first display contract."""
+
+
+def test_initial_ai_status_sanitizes_cached_gemini_recommendation(monkeypatch):
+    import routes.ai_routes as ai_routes
+
+    monkeypatch.setattr(
+        ai_routes.ai_provider_service,
+        "_status_cache",
+        {
+            "data": {
+                "default_provider": "gemini",
+                "recommended_provider": "gemini",
+                "ollama": {"connected": None},
+                "gemini": {"connected": True},
+            }
+        },
+    )
+
+    status = ai_routes._get_ai_status_for_initial_render()
+
+    assert status["default_provider"] == "ollama"
+    assert status["recommended_provider"] == "ollama"
+
+
+def test_initial_ai_status_never_recommends_gemini_without_cache(monkeypatch):
+    import routes.ai_routes as ai_routes
+
+    class FakeProvider:
+        default_provider = "gemini"
+        _status_cache = {}
+
+    monkeypatch.setattr(ai_routes, "ai_provider_service", FakeProvider())
+
+    status = ai_routes._get_ai_status_for_initial_render()
+
+    assert status["default_provider"] == "ollama"
+    assert status["recommended_provider"] == "ollama"
+