diff --git a/resources/js/chat-room/idiom-quiz.js b/resources/js/chat-room/idiom-quiz.js
index 94d050d..0cbc5db 100644
--- a/resources/js/chat-room/idiom-quiz.js
+++ b/resources/js/chat-room/idiom-quiz.js
@@ -8,6 +8,17 @@ function csrf() {
 let currentRoundId = 0;
 let currentRoomId = 0;
 
+/**
+ * 查找当前回合是否已经有对应的聊天室消息节点。
+ */
+function findIdiomRoundMessageNode(roundId) {
+    if (roundId <= 0) {
+        return null;
+    }
+
+    return document.querySelector(`[data-idiom-round-id="${roundId}"]`);
+}
+
 /**
  * 为指定回合创建统一样式的答题按钮。
  */
@@ -127,8 +138,38 @@ function handleIdiomGameStarted(e) {
     currentRoundId = round_id;
     currentRoomId = window.chatContext?.roomId || 0;
 
-    // 追加一条聊天室消息（由 MessageSent 事件负责渲染，不重复添加）
-    // 这里只存储当前回合信息
+    // 线上如果 MessageSent 补消息没有到达，这里主动补一条公屏消息兜底；
+    // 本地或正常链路下若消息已存在，则只补挂答题按钮，避免重复渲染。
+    const existingMessageNode = findIdiomRoundMessageNode(round_id);
+    if (existingMessageNode) {
+        attachIdiomAnswerButton(existingMessageNode, {
+            from_user: "星海小博士",
+            content: message || `🧩 猜成语时间！${hint}`,
+            idiom_game_round_id: round_id,
+            idiom_reward_gold: reward_gold,
+            idiom_reward_exp: reward_exp,
+        });
+        console.log(`猜成语开始：${hint}，奖励 ${reward_gold}金/${reward_exp}经验`);
+        return;
+    }
+
+    const now = new Date();
+    const timeStr = `${now.getFullYear()}-${String(now.getMonth() + 1).padStart(2, "0")}-${String(now.getDate()).padStart(2, "0")} ${String(now.getHours()).padStart(2, "0")}:${String(now.getMinutes()).padStart(2, "0")}:${String(now.getSeconds()).padStart(2, "0")}`;
+    window.appendMessage?.({
+        id: `idiom-start-live-${round_id}`,
+        room_id: currentRoomId || window.chatContext?.roomId || 0,
+        from_user: "星海小博士",
+        to_user: "大家",
+        content: message || `🧩 猜成语时间！${hint}`,
+        is_secret: false,
+        font_color: "#7c3aed",
+        action: "",
+        idiom_game_round_id: round_id,
+        idiom_reward_gold: reward_gold,
+        idiom_reward_exp: reward_exp,
+        sent_at: timeStr,
+    });
+
     console.log(`猜成语开始：${hint}，奖励 ${reward_gold}金/${reward_exp}经验`);
 }
 
diff --git a/resources/js/chat-room/message-renderer.js b/resources/js/chat-room/message-renderer.js
index b2a33cf..9f4ad40 100644
--- a/resources/js/chat-room/message-renderer.js
+++ b/resources/js/chat-room/message-renderer.js
@@ -121,6 +121,23 @@ export function appendMessage(msg, renderBatch = null) {
 
     state.trackMaxMsgId(msg.id || 0);
 
+    const idiomRoundId = Number.parseInt(
+        String(msg.idiom_game_round_id || msg.idom_game_round_id || "0"),
+        10,
+    );
+    const isIdiomStartMessage = idiomRoundId > 0
+        && msg.from_user === "星海小博士"
+        && !msg.action
+        && String(msg.content || "").includes("猜成语时间");
+
+    if (isIdiomStartMessage) {
+        const existingIdiomNode = document.querySelector(`[data-idiom-round-id="${idiomRoundId}"]`);
+        if (existingIdiomNode) {
+            attachIdiomAnswerButton(existingIdiomNode, msg);
+            return existingIdiomNode;
+        }
+    }
+
     const isMe = msg.from_user === window.chatContext?.username;
     const fontColor = msg.font_color || "#000000";
     const blockRuleKey = resolveBlockedSystemSenderKey(msg);
@@ -131,6 +148,9 @@ export function appendMessage(msg, renderBatch = null) {
     if (msg?.from_user) {
         div.dataset.fromUser = msg.from_user;
     }
+    if (idiomRoundId > 0) {
+        div.dataset.idiomRoundId = String(idiomRoundId);
+    }
     if (blockRuleKey) {
         div.dataset.blockKey = blockRuleKey;
     }