diff --git a/src/app/chat/chat-screen.tsx b/src/app/chat/chat-screen.tsx
index 7cad1c97..ad89ca87 100644
--- a/src/app/chat/chat-screen.tsx
+++ b/src/app/chat/chat-screen.tsx
@@ -44,7 +44,7 @@ export function ChatScreen() {
 
   // 消息数量限制由后端统一返回 lockDetail，前端不再处理本地额度。
   const showMessageLimitBanner =
-    state.upgradePromptVisible && state.upgradeReason === "daily_limit";
+    state.upgradePromptVisible && state.upgradeReason === "weekly_limit";
   const messageLimitTitle = "The limit for free chat times\nhas been reached";
 
   const externalBrowserPromptShownRef = useRef(false);
diff --git a/src/app/chat/components/chat-quota-exhausted-banner.tsx b/src/app/chat/components/chat-quota-exhausted-banner.tsx
index 93358e59..1caebe8e 100644
--- a/src/app/chat/components/chat-quota-exhausted-banner.tsx
+++ b/src/app/chat/components/chat-quota-exhausted-banner.tsx
@@ -3,7 +3,7 @@
  * ChatQuotaExhaustedBanner 游客配额耗尽横幅
  *
  * 何时显示：
- *   - 后端返回 lockDetail.reason="daily_limit" 且 showUpgrade=true
+ *   - 后端返回 lockDetail.reason="weekly_limit" 且 showUpgrade=true
  *
  * 视觉规格（与设计稿对齐）：
  *   - 粉→品红渐变背景（与 splash 渐变一致）
diff --git a/src/stores/chat/__tests__/chat-machine.helpers.test.ts b/src/stores/chat/__tests__/chat-machine.helpers.test.ts
index 97e308f2..80de88f6 100644
--- a/src/stores/chat/__tests__/chat-machine.helpers.test.ts
+++ b/src/stores/chat/__tests__/chat-machine.helpers.test.ts
@@ -132,7 +132,7 @@ describe("sendResponseToUiMessage", () => {
 });
 
 describe("applyHttpSendOutput", () => {
-  it("removes the optimistic user message when the daily limit is reached", () => {
+  it("removes the optimistic user message when the weekly limit is reached", () => {
     const context = makeChatState({
       messages: [
         {
@@ -151,11 +151,11 @@ describe("applyHttpSendOutput", () => {
           locked: true,
           showContent: false,
           showUpgrade: true,
-          reason: "daily_limit",
+          reason: "weekly_limit",
           hint: "Free message limit reached.",
           detail: {
-            type: "daily_msg_limit",
-            usedToday: 3,
+            type: "weekly_msg_limit",
+            usedThisWeek: 3,
             limit: 3,
           },
         },
@@ -166,7 +166,7 @@ describe("applyHttpSendOutput", () => {
     expect(nextState.messages).toEqual([]);
     expect(nextState.isReplyingAI).toBe(false);
     expect(nextState.upgradePromptVisible).toBe(true);
-    expect(nextState.upgradeReason).toBe("daily_limit");
+    expect(nextState.upgradeReason).toBe("weekly_limit");
   });
 });
 
@@ -262,7 +262,7 @@ describe("countLockedHistoryMessages", () => {
           isFromAI: true,
           date: "2026-06-29",
           locked: true,
-          lockReason: "daily_limit",
+          lockReason: "weekly_limit",
         },
         {
           content: "user text",
diff --git a/src/stores/chat/__tests__/chat-machine.transitions.test.ts b/src/stores/chat/__tests__/chat-machine.transitions.test.ts
index 4bcabbcf..3b3a690d 100644
--- a/src/stores/chat/__tests__/chat-machine.transitions.test.ts
+++ b/src/stores/chat/__tests__/chat-machine.transitions.test.ts
@@ -437,7 +437,7 @@ describe("chatMachine transitions", () => {
     actor.stop();
   });
 
-  it("clears the daily limit prompt after payment succeeds", async () => {
+  it("clears the weekly limit prompt after payment succeeds", async () => {
     const actor = createActor(createTestChatMachine()).start();
 
     actor.send({ type: "ChatUserLogin", token: "token" });
@@ -459,11 +459,11 @@ describe("chatMachine transitions", () => {
             locked: true,
             showContent: false,
             showUpgrade: true,
-            reason: "daily_limit",
+            reason: "weekly_limit",
             hint: "Free message limit reached.",
             detail: {
-              type: "daily_msg_limit",
-              usedToday: 3,
+              type: "weekly_msg_limit",
+              usedThisWeek: 3,
               limit: 3,
             },
           },
@@ -473,7 +473,7 @@ describe("chatMachine transitions", () => {
     });
 
     expect(actor.getSnapshot().context.upgradePromptVisible).toBe(true);
-    expect(actor.getSnapshot().context.upgradeReason).toBe("daily_limit");
+    expect(actor.getSnapshot().context.upgradeReason).toBe("weekly_limit");
 
     actor.send({ type: "ChatPaymentSucceeded" });
 
diff --git a/src/stores/chat/chat-machine.actors.ts b/src/stores/chat/chat-machine.actors.ts
index e6547306..751e599f 100644
--- a/src/stores/chat/chat-machine.actors.ts
+++ b/src/stores/chat/chat-machine.actors.ts
@@ -156,12 +156,12 @@ async function sendMessageViaHttp(content: string): Promise<{
     log.error("[chat-machine] sendMessageHttpActor failed", { error: result.error });
     throw result.error;
   }
-  const isDailyLimit =
+  const isMessageLimit =
     result.data.lockDetail.locked &&
     result.data.lockDetail.showUpgrade &&
-    result.data.lockDetail.reason === "daily_limit";
+    result.data.lockDetail.reason === "weekly_limit";
   return {
     response: result.data,
-    reply: isDailyLimit ? null : sendResponseToUiMessage(result.data),
+    reply: isMessageLimit ? null : sendResponseToUiMessage(result.data),
   };
 }
diff --git a/src/stores/chat/chat-machine.helpers.ts b/src/stores/chat/chat-machine.helpers.ts
index c7f4f773..d5269110 100644
--- a/src/stores/chat/chat-machine.helpers.ts
+++ b/src/stores/chat/chat-machine.helpers.ts
@@ -173,7 +173,7 @@ export function applyHttpSendOutput(
   const isMessageLimitBlocked =
     lockDetail.locked &&
     lockDetail.showUpgrade &&
-    lockDetail.reason === "daily_limit";
+    lockDetail.reason === "weekly_limit";
 
   if (isMessageLimitBlocked) {
     const lastMessage = context.messages[context.messages.length - 1];
@@ -186,7 +186,7 @@ export function applyHttpSendOutput(
       messages,
       ...finishPendingReply(context),
       upgradePromptVisible: true,
-      upgradeReason: "daily_limit",
+      upgradeReason: "weekly_limit",
     };
   }
 
diff --git a/src/stores/chat/chat-machine.ts b/src/stores/chat/chat-machine.ts
index d9acd6c4..9bc10dd0 100644
--- a/src/stores/chat/chat-machine.ts
+++ b/src/stores/chat/chat-machine.ts
@@ -23,7 +23,7 @@
  *
  * 配额：
  *   - 前端不再处理本地消息额度；游客 / 注册用户均以后端响应为准。
- *   - 后端返回 `lockDetail.reason="daily_limit"` 且需要升级时展示会员引导。
+ *   - 后端返回 `lockDetail.reason="weekly_limit"` 且需要升级时展示会员引导。
  *
  */
 
diff --git a/src/stores/chat/chat-state.ts b/src/stores/chat/chat-state.ts
index 15376a66..3c2ed108 100644
--- a/src/stores/chat/chat-state.ts
+++ b/src/stores/chat/chat-state.ts
@@ -5,7 +5,7 @@ export interface ChatState {
   isReplyingAI: boolean;
   pendingReplyCount: number;
   upgradePromptVisible: boolean;
-  upgradeReason: "daily_limit" | null;
+  upgradeReason: "weekly_limit" | null;
   isLoadingMore: boolean;
   hasMore: boolean;
   historyOffset: number;