diff --git a/src/features/draw/draw-status-meta.ts b/src/features/draw/draw-status-meta.ts
index 507f2c8..bd35a80 100644
--- a/src/features/draw/draw-status-meta.ts
+++ b/src/features/draw/draw-status-meta.ts
@@ -6,6 +6,14 @@ export type DrawStatusHud = {
   countdownKind: "close" | "draw" | "cooldown" | "none";
 };
 
+/**
+ * 界面文档 §4.2「封盘」展示：`closing`（封盘中）与 `closed`（待开奖）——
+ * 倒计时区域使用错误色 #ff4d4f，并提示「请选择下一期」。
+ */
+export function isHallSealedCountdownUi(status: string): boolean {
+  return status === "closing" || status === "closed";
+}
+
 /** 对齐界面文档 §4.2 状态文案与 PRD 期号状态 */
 export function drawStatusHud(status: string): DrawStatusHud {
   switch (status) {
diff --git a/src/features/hall/hall-bet-preview-dialog.tsx b/src/features/hall/hall-bet-preview-dialog.tsx
index c5200c2..4f5c36f 100644
--- a/src/features/hall/hall-bet-preview-dialog.tsx
+++ b/src/features/hall/hall-bet-preview-dialog.tsx
@@ -22,6 +22,8 @@ type HallBetPreviewDialogProps = {
   currencyCode: string;
   data: TicketPreviewData | null;
   placing: boolean;
+  /** 界面 §4.2：封盘后禁止提交，主按钮文案为「已封盘」 */
+  allowSubmit?: boolean;
   onConfirmPlace: () => void;
 };
 
@@ -56,6 +58,7 @@ export function HallBetPreviewDialog({
   currencyCode,
   data,
   placing,
+  allowSubmit = true,
   onConfirmPlace,
 }: HallBetPreviewDialogProps) {
   const summary = data?.summary;
@@ -71,6 +74,15 @@ export function HallBetPreviewDialog({
               请核对号码、玩法与实扣金额；确认后将扣减彩票钱包且不可撤单（产品文档 §6.3）。
             </DialogDescription>
           </DialogHeader>
+          {!allowSubmit ? (
+            <Alert className="mt-3 border-[#ff4d4f]/35 bg-[#ff4d4f]/8 text-[#ff4d4f] dark:bg-[#ff4d4f]/12">
+              <AlertTriangleIcon />
+              <AlertTitle>已封盘</AlertTitle>
+              <AlertDescription className="text-xs leading-relaxed">
+                当前期已停止接收注单，无法提交。请选择下一期（界面文档 §4.2）。
+              </AlertDescription>
+            </Alert>
+          ) : null}
         </div>
 
         <ScrollArea className="max-h-[min(52vh,360px)] border-y px-4">
@@ -160,8 +172,8 @@ export function HallBetPreviewDialog({
           <Button type="button" variant="outline" onClick={() => onOpenChange(false)} disabled={placing}>
             返回修改
           </Button>
-          <Button type="button" onClick={onConfirmPlace} disabled={!data || placing}>
-            {placing ? "提交中…" : "确认提交"}
+          <Button type="button" onClick={onConfirmPlace} disabled={!data || placing || !allowSubmit}>
+            {placing ? "提交中…" : allowSubmit ? "确认提交" : "已封盘"}
           </Button>
         </div>
       </DialogContent>
diff --git a/src/features/hall/hall-betting-grid.tsx b/src/features/hall/hall-betting-grid.tsx
index 7a69b2b..82f8908 100644
--- a/src/features/hall/hall-betting-grid.tsx
+++ b/src/features/hall/hall-betting-grid.tsx
@@ -18,6 +18,7 @@ import { mapTicketBetError } from "@/features/hall/hall-bet-errors";
 import { HallBetAmountInput } from "@/features/hall/hall-bet-amount-input";
 import { HallBetPreviewDialog } from "@/features/hall/hall-bet-preview-dialog";
 import { HallBetNumberInput } from "@/features/hall/hall-bet-number-input";
+import { isHallSealedCountdownUi } from "@/features/draw/draw-status-meta";
 import {
   playNeedsDigitSlot,
   playNeedsDimension,
@@ -195,6 +196,7 @@ export function HallBettingGrid() {
   const maxBet = selectedRow?.config?.max_bet_amount ?? 999_999_999;
 
   const tableDisabled = !isBettable || catalogState.kind !== "ok";
+  const sealedBetUi = Boolean(display && isHallSealedCountdownUi(display.status));
 
   const [previewOpen, setPreviewOpen] = useState(false);
   const [previewData, setPreviewData] = useState<TicketPreviewData | null>(null);
@@ -271,6 +273,10 @@ export function HallBettingGrid() {
 
   const handlePlace = async () => {
     if (!display || !previewData) return;
+    if (!isBettable) {
+      toast.error("已封盘，无法提交。");
+      return;
+    }
     const line = buildLine();
     if (!line) {
       toast.error("提交前数据已变化，请关闭预览后重试。");
@@ -328,13 +334,23 @@ export function HallBettingGrid() {
       <div
         className={cn(
           "space-y-5 transition-opacity",
-          tableDisabled && "pointer-events-none opacity-50",
+          tableDisabled && "pointer-events-none",
+          tableDisabled && (sealedBetUi ? "opacity-[0.52]" : "opacity-50"),
         )}
       >
         {!isBettable && display ? (
-          <p className="rounded-lg border border-rose-500/30 bg-rose-500/10 px-3 py-2 text-sm text-rose-800 dark:text-rose-200">
-            已封盘：本期状态为「{display.status}」，不可下注。按钮已锁定为「已封盘」（产品文档 §6.3、界面 §4.2）。
-          </p>
+          sealedBetUi ? (
+            <div className="space-y-1 rounded-lg border border-[#ff4d4f]/35 bg-[#ff4d4f]/8 px-3 py-2 text-sm text-[#ff4d4f] dark:bg-[#ff4d4f]/10">
+              <p className="font-medium">
+                已封盘：表格置灰且不可编辑；倒计时区域见上方期号卡片（界面文档 §4.2）。
+              </p>
+              <p className="text-xs leading-relaxed">请选择下一期。</p>
+            </div>
+          ) : (
+            <p className="rounded-lg border border-muted-foreground/30 bg-muted/50 px-3 py-2 text-sm text-muted-foreground">
+              当前期不可下注（状态「{display.status}」）。提交入口已禁用。
+            </p>
+          )
         ) : null}
 
         <HallPlaySwitcher
@@ -437,7 +453,12 @@ export function HallBettingGrid() {
 
   return (
     <>
-      <Card className={cn(!isBettable && display && "border-rose-500/30")}>
+      <Card
+        className={cn(
+          sealedBetUi && "border-[#ff4d4f]/40 bg-muted/30",
+          !isBettable && display && !sealedBetUi && "border-muted-foreground/20 bg-muted/20",
+        )}
+      >
         <CardHeader>
           <CardTitle className="text-base">下注</CardTitle>
           <CardDescription>
@@ -456,6 +477,7 @@ export function HallBettingGrid() {
         currencyCode={currencyCode}
         data={previewData}
         placing={placeLoading}
+        allowSubmit={isBettable}
         onConfirmPlace={() => void handlePlace()}
       />
     </>
diff --git a/src/features/hall/hall-draw-panel.tsx b/src/features/hall/hall-draw-panel.tsx
index 2d65948..1e1cc27 100644
--- a/src/features/hall/hall-draw-panel.tsx
+++ b/src/features/hall/hall-draw-panel.tsx
@@ -11,13 +11,16 @@ import {
   CardTitle,
 } from "@/components/ui/card";
 import { Skeleton } from "@/components/ui/skeleton";
-import { drawStatusHud } from "@/features/draw/draw-status-meta";
+import { drawStatusHud, isHallSealedCountdownUi } from "@/features/draw/draw-status-meta";
 import { useHallDrawLive } from "@/features/hall/use-hall-draw-live";
 import { formatSecondsClock } from "@/lib/format-gmt";
 import { formatLotteryInstant } from "@/lib/player-datetime";
 import { cn } from "@/lib/utils";
 import type { DrawCurrentPayload } from "@/types/api/draw-current";
 
+/** 界面文档 §1.4：错误/封盘 #ff4d4f */
+const UI_DOC_ERROR = "text-[#ff4d4f]";
+
 function CountdownStrip({
   hud,
   payload,
@@ -25,6 +28,8 @@ function CountdownStrip({
   hud: ReturnType<typeof drawStatusHud>;
   payload: DrawCurrentPayload;
 }) {
+  const sealedCountdown = isHallSealedCountdownUi(payload.status);
+
   if (hud.countdownKind === "close" && payload.seconds_to_close > 0) {
     return (
       <p className="text-sm text-muted-foreground">
@@ -37,12 +42,17 @@ function CountdownStrip({
   }
   if (hud.countdownKind === "draw" && payload.seconds_to_draw > 0) {
     return (
-      <p className="text-sm text-muted-foreground">
+      <p
+        className={cn(
+          "text-sm",
+          sealedCountdown ? cn(UI_DOC_ERROR, "font-medium") : "text-muted-foreground",
+        )}
+      >
         距离开奖:{" "}
         <span
           className={cn(
             "font-mono text-base font-semibold tabular-nums",
-            payload.status === "closing" && "text-rose-600 dark:text-rose-400",
+            sealedCountdown ? UI_DOC_ERROR : "text-foreground",
           )}
         >
           {formatSecondsClock(payload.seconds_to_draw)}
@@ -112,9 +122,12 @@ export function HallDrawPanel() {
   }
 
   const hud = drawStatusHud(display.status);
+  const sealedUi = isHallSealedCountdownUi(display.status);
 
   return (
-    <Card className={cn(display.status === "closing" && "border-rose-500/40")}>
+    <Card
+      className={cn(sealedUi && "border-[#ff4d4f]/45")}
+    >
       <CardHeader className="space-y-1 pb-2">
         <div className="flex flex-wrap items-start justify-between gap-2">
           <div className="min-w-0">
@@ -143,11 +156,14 @@ export function HallDrawPanel() {
       </CardHeader>
       <CardContent className="space-y-3">
         <CountdownStrip hud={hud} payload={display} />
-        {(display.status === "closing" || display.status === "closed") && (
-          <p className="text-xs text-rose-600 dark:text-rose-400">
-            已封盘：下注区已锁定，提交按钮显示「已封盘」。详见产品文档 §6.3、实施计划 §13.3。
-          </p>
-        )}
+        {sealedUi ? (
+          <div className={cn("space-y-1 text-xs", UI_DOC_ERROR)}>
+            <p className="font-medium">
+              已封盘：期号状态已标记「已封盘」，下注表格置灰且不可编辑；提交入口为「已封盘」。
+            </p>
+            <p>请选择下一期。</p>
+          </div>
+        ) : null}
         {Array.isArray(display.result_items) && display.result_items.length > 0 ? (
           <div className="rounded-lg border border-dashed border-border bg-muted/30 p-3 text-xs text-muted-foreground">
             本期号码已发布，完整 23 组展示见{" "}
diff --git a/src/features/hall/hall-screen.tsx b/src/features/hall/hall-screen.tsx
index bf8f196..b843af3 100644
--- a/src/features/hall/hall-screen.tsx
+++ b/src/features/hall/hall-screen.tsx
@@ -6,7 +6,7 @@ import { HallPlayCatalogPanel } from "@/features/hall/hall-play-catalog-panel";
 import { HallWalletStrip } from "@/features/hall/hall-wallet-strip";
 
 /**
- * 下注大厅：钱包条 §4 + 当期期号 §4.2；玩法目录阶段 4（§12.3）；下注表格阶段 5（§13.3）。
+ * 下注大厅：钱包条 §4 + 当期期号 §4.2（封盘置灰 / 倒计时错误色 / WS+轮询）；玩法目录 §12.3；下注表格 §13.3。
  */
 export function HallScreen() {
   return (