diff --git a/src/features/player/entry-gate.tsx b/src/features/player/entry-gate.tsx
index 28d74bb..d23a806 100644
--- a/src/features/player/entry-gate.tsx
+++ b/src/features/player/entry-gate.tsx
@@ -17,7 +17,7 @@ import { useTranslation } from "react-i18next";
 
 import { getPlayerMe, getPlayerPing } from "@/api/player";
 import { LanguageSwitcher } from "@/components/language-switcher";
-import { Button } from "@/components/ui/button";
+import { Button, buttonVariants } from "@/components/ui/button";
 import { cn } from "@/lib/utils";
 import { usePlayerSessionStore } from "@/stores/player-session-store";
 import { LotteryApiBizError } from "@/types/api/errors";
@@ -25,6 +25,17 @@ import { LotteryApiBizError } from "@/types/api/errors";
 const RETRY_ATTEMPTS = 3;
 const RETRY_DELAY_MS = 2000;
 
+const MAIN_SITE_URL = process.env.NEXT_PUBLIC_MAIN_SITE_URL?.trim() ?? "";
+
+/** `/api/player/me` 等业务信封业务码 — 玩家 SSO 段 8001–8005（与后端 ErrorCode 一致） */
+const PLAYER_BIZ_DETAIL: Partial<Record<number, string>> = {
+  8001: "errors.player8001",
+  8002: "errors.player8002",
+  8003: "errors.player8003",
+  8004: "errors.player8004",
+  8005: "errors.player8005",
+};
+
 type EntryStepId = "token" | "account" | "hall";
 
 type EntryStepStatus = "pending" | "in-progress" | "done" | "error";
@@ -160,12 +171,7 @@ export function EntryGate() {
 
           const details: FailureRow[] = [];
           if (typeof err.code === "number") {
-            const keyByCode: Partial<Record<number, string>> = {
-              401: "errors.http401",
-              403: "errors.http403",
-              404: "errors.http404",
-            };
-            const dk = keyByCode[err.code];
+            const dk = PLAYER_BIZ_DETAIL[err.code];
             details.push({
               code: String(err.code),
               ...(dk ? { detailKey: dk } : {}),
@@ -373,15 +379,27 @@ export function EntryGate() {
               </div>
             ) : null}
 
-            <Button
-              onClick={handleRetry}
-              className="w-full gap-2 bg-red-600 text-white hover:bg-red-700"
-              size="lg"
-              type="button"
-            >
-              <Loader2 className="size-4" aria-hidden />
-              {t("failure.reenter")}
-            </Button>
+            <div className="flex flex-col gap-2">
+              <Button
+                onClick={handleRetry}
+                className="w-full gap-2 bg-red-600 text-white hover:bg-red-700"
+                size="lg"
+                type="button"
+              >
+                <Loader2 className="size-4" aria-hidden />
+                {t("failure.reenter")}
+              </Button>
+              {MAIN_SITE_URL !== "" ? (
+                <a
+                  href={MAIN_SITE_URL}
+                  target="_top"
+                  rel="noopener noreferrer"
+                  className={cn(buttonVariants({ variant: "outline", size: "lg" }), "w-full")}
+                >
+                  {t("failure.backToMainSite")}
+                </a>
+              ) : null}
+            </div>
           </div>
         ) : null}
 
diff --git a/src/i18n/locales/en/entry.json b/src/i18n/locales/en/entry.json
index 0711ea8..2cc4f53 100644
--- a/src/i18n/locales/en/entry.json
+++ b/src/i18n/locales/en/entry.json
@@ -37,7 +37,8 @@
       "check": "Check",
       "reason": "Reason"
     },
-    "reenter": "Re-enter"
+    "reenter": "Re-enter",
+    "backToMainSite": "Back to main site"
   },
   "success": {
     "title": "Authorization successful!",
@@ -60,6 +61,11 @@
     "tryLater": "Please try again later",
     "http401": "Token is invalid or expired",
     "http403": "Account has been blocked",
-    "http404": "Account not found in the system"
+    "http404": "Account not found in the system",
+    "player8001": "Missing or invalid Authorization",
+    "player8002": "Token invalid, expired, malformed, or exceeding the allowed time window (e.g. >5 min)",
+    "player8003": "Player not registered (dev token only)",
+    "player8004": "SSO not configured on lottery server",
+    "player8005": "Account suspended or unavailable"
   }
 }
diff --git a/src/i18n/locales/ne/entry.json b/src/i18n/locales/ne/entry.json
index ad7abec..5501448 100644
--- a/src/i18n/locales/ne/entry.json
+++ b/src/i18n/locales/ne/entry.json
@@ -37,7 +37,8 @@
       "check": "जाँच",
       "reason": "कारण"
     },
-    "reenter": "पुन: प्रवेश"
+    "reenter": "पुन: प्रवेश",
+    "backToMainSite": "मुख्य साइटमा फर्कनुहोस्"
   },
   "success": {
     "title": "प्राधिकरण सफल!",
@@ -60,6 +61,11 @@
     "tryLater": "कृपया पछि प्रयास गर्नुहोस्",
     "http401": "टोकन अमान्य वा म्याद सकियो",
     "http403": "खाता रोकिएको छ",
-    "http404": "प्रणालीमा खाता फेला परेन"
+    "http404": "प्रणालीमा खाता फेला परेन",
+    "player8001": "अनुमति हेडर हराइरहेको छ वा अमान्य छ",
+    "player8002": "टोकन अमान्य, म्याद सकिएको, फिल्ड हराइएको वा समय सीमा मन नपर्ने",
+    "player8003": "खाता दर्ता छैन (विकास टोकन मात्र)",
+    "player8004": "लटरी सर्भरमा SSO कन्फिगर छैन",
+    "player8005": "खाता निलम्बन वा अनुपलब्ध"
   }
 }
diff --git a/src/i18n/locales/zh/entry.json b/src/i18n/locales/zh/entry.json
index 2b154db..5b12d43 100644
--- a/src/i18n/locales/zh/entry.json
+++ b/src/i18n/locales/zh/entry.json
@@ -37,7 +37,8 @@
       "check": "检查项",
       "reason": "原因"
     },
-    "reenter": "重新进入"
+    "reenter": "重新进入",
+    "backToMainSite": "返回主站"
   },
   "success": {
     "title": "授权成功！",
@@ -60,6 +61,11 @@
     "tryLater": "请稍后再试",
     "http401": "令牌无效或已过期",
     "http403": "账号已被封禁",
-    "http404": "系统中未找到该账号"
+    "http404": "系统中未找到该账号",
+    "player8001": "缺少或非法的授权凭证",
+    "player8002": "Token 无效、已过期或不符合时效（如有效窗超过 5 分钟/缺少必填字段）",
+    "player8003": "玩家未注册（仅开发 Token）",
+    "player8004": "彩票服务端未配置 SSO",
+    "player8005": "账号已冻结或不可用"
   }
 }