diff --git a/src/app/(player)/layout.tsx b/src/app/(player)/layout.tsx
index 5fd7b57..e9b6a87 100644
--- a/src/app/(player)/layout.tsx
+++ b/src/app/(player)/layout.tsx
@@ -1,7 +1,9 @@
+import { PlayerMobileViewport } from "@/components/layout/player-mobile-viewport";
+
 export default function PlayerRootLayout({
   children,
 }: Readonly<{
   children: React.ReactNode;
 }>) {
-  return children;
+  return <PlayerMobileViewport>{children}</PlayerMobileViewport>;
 }
diff --git a/src/app/layout.tsx b/src/app/layout.tsx
index 4c55015..cd009bc 100644
--- a/src/app/layout.tsx
+++ b/src/app/layout.tsx
@@ -20,6 +20,11 @@ export const metadata: Metadata = {
   description: "Lottery player",
 };
 
+export const viewport = {
+  width: "device-width",
+  initialScale: 1,
+};
+
 export default function RootLayout({
   children,
 }: Readonly<{
diff --git a/src/components/layout/player-app-shell.tsx b/src/components/layout/player-app-shell.tsx
index 47f81fe..0d7b427 100644
--- a/src/components/layout/player-app-shell.tsx
+++ b/src/components/layout/player-app-shell.tsx
@@ -20,7 +20,7 @@ export function PlayerAppShell({ children }: PlayerAppShellProps): ReactNode {
   return (
     <div className="min-h-dvh bg-white text-foreground">
       <NetworkStatusBanner />
-      <main className="mx-auto flex w-full max-w-lg flex-col pb-[calc(3.5rem+env(safe-area-inset-bottom,0px)+0.75rem)]">
+      <main className="flex w-full flex-col pb-[calc(3.5rem+env(safe-area-inset-bottom,0px)+0.75rem)]">
         {children}
       </main>
       <PlayerBottomNav />
diff --git a/src/components/layout/player-bottom-nav.tsx b/src/components/layout/player-bottom-nav.tsx
index 12adfa5..3fd7fa5 100644
--- a/src/components/layout/player-bottom-nav.tsx
+++ b/src/components/layout/player-bottom-nav.tsx
@@ -6,6 +6,7 @@ import { usePathname } from "next/navigation";
 import { BarChart3, ClipboardList, Home, Wallet } from "lucide-react";
 import { useTranslation } from "react-i18next";
 
+import { playerViewportFixedBarClass } from "@/lib/player-viewport";
 import { cn } from "@/lib/utils";
 
 const tabs = [
@@ -48,10 +49,13 @@ export function PlayerBottomNav() {
 
   return (
     <nav
-      className="fixed bottom-0 left-0 right-0 z-50 border-t border-[#e4ebf5] bg-white/96 pb-[env(safe-area-inset-bottom,0px)] shadow-[0_-10px_30px_rgba(15,23,42,0.08)] backdrop-blur-md"
+      className={cn(
+        playerViewportFixedBarClass,
+        "bottom-0 border-t border-[#e4ebf5] bg-white/96 pb-[env(safe-area-inset-bottom,0px)] shadow-[0_-10px_30px_rgba(15,23,42,0.08)] backdrop-blur-md",
+      )}
       aria-label={t("nav.aria")}
     >
-      <div className="mx-auto grid h-14 w-full max-w-lg grid-rows-1 grid-cols-4">
+      <div className="grid h-14 w-full grid-cols-4 grid-rows-1">
         {tabs.map(({ href, labelKey, labelDefault, icon: Icon, match }) => {
           const active = match(pathname);
           const label = t(labelKey, { defaultValue: labelDefault });
diff --git a/src/components/layout/player-mobile-viewport.tsx b/src/components/layout/player-mobile-viewport.tsx
new file mode 100644
index 0000000..d80db19
--- /dev/null
+++ b/src/components/layout/player-mobile-viewport.tsx
@@ -0,0 +1,31 @@
+import type { ReactNode } from "react";
+
+import { playerViewportColumnClass } from "@/lib/player-viewport";
+import { cn } from "@/lib/utils";
+
+type PlayerMobileViewportProps = {
+  children: ReactNode;
+  className?: string;
+};
+
+/**
+ * 玩家端根容器：真机全宽；桌面浏览器居中为固定宽度的 H5 画布，避免 PC 打开时 UI 横向拉满。
+ */
+export function PlayerMobileViewport({
+  children,
+  className,
+}: PlayerMobileViewportProps): ReactNode {
+  return (
+    <div className="min-h-dvh bg-[#e8ecf3]">
+      <div
+        className={cn(
+          playerViewportColumnClass,
+          "relative min-h-dvh bg-white shadow-none sm:shadow-[0_0_48px_rgba(15,23,42,0.1)]",
+          className,
+        )}
+      >
+        {children}
+      </div>
+    </div>
+  );
+}
diff --git a/src/features/hall/hall-betting-grid.tsx b/src/features/hall/hall-betting-grid.tsx
index 6113fd1..d1da814 100644
--- a/src/features/hall/hall-betting-grid.tsx
+++ b/src/features/hall/hall-betting-grid.tsx
@@ -1159,7 +1159,7 @@ export function HallBettingGrid({ drawLive }: { drawLive: HallDrawLiveSnapshot }
                         <th key={column.key} className="min-w-16 px-1 py-2 text-center font-bold">
                           <span className="block truncate">
                             {pickDisplayName(column.play)}
-                            {column.digitSlot !== undefined
+                            {column.digitSlot !== undefined && activeCategory !== "JACKPOT"
                               ? `-${digitSlotLabel(activeCategory, column.digitSlot)}`
                               : ""}
                           </span>
diff --git a/src/i18n/index.ts b/src/i18n/index.ts
index a222a7b..23f06f5 100644
--- a/src/i18n/index.ts
+++ b/src/i18n/index.ts
@@ -53,6 +53,17 @@ const resources = {
   Record<(typeof namespaces)[number], Record<string, unknown>>
 >;
 
+function resolveInitialLanguage(): AppLanguage {
+  // SSR 始终使用默认语言，避免首屏渲染依赖浏览器状态
+  if (typeof window === "undefined") {
+    return DEFAULT_LANGUAGE;
+  }
+
+  const stored = window.localStorage.getItem("i18nextLng");
+  const preferred = normalizeLanguage(stored ?? window.navigator.language);
+  return preferred;
+}
+
 export function syncDocumentLanguage(lang: AppLanguage): void {
   if (typeof document === "undefined") return;
 
@@ -72,6 +83,8 @@ export function syncPreferredLanguage(): void {
 }
 
 if (!i18n.isInitialized) {
+  const initialLng = resolveInitialLanguage();
+
   void i18n.use(initReactI18next).init({
     resources,
     fallbackLng: DEFAULT_LANGUAGE,
@@ -80,8 +93,7 @@ if (!i18n.isInitialized) {
     ns: [...namespaces],
     /** 始终先用默认语言完成 SSR / 首次 hydration，避免首屏文本不一致 */
     load: "languageOnly",
-    lng: DEFAULT_LANGUAGE,
-    initImmediate: false,
+    lng: initialLng,
 
     interpolation: {
       escapeValue: false,
diff --git a/src/lib/player-viewport.ts b/src/lib/player-viewport.ts
new file mode 100644
index 0000000..ea81cf5
--- /dev/null
+++ b/src/lib/player-viewport.ts
@@ -0,0 +1,9 @@
+/** H5 玩家端逻辑宽度（px），桌面浏览器居中展示为「手机画布」 */
+export const PLAYER_VIEWPORT_MAX_PX = 480;
+
+/** 内容列：全宽但不超过手机逻辑宽度，水平居中 */
+export const playerViewportColumnClass = "mx-auto w-full max-w-[480px]" as const;
+
+/** 贴底/贴顶固定栏：与内容列同宽并居中（桌面不铺满整屏） */
+export const playerViewportFixedBarClass =
+  "fixed left-1/2 z-50 w-full max-w-[480px] -translate-x-1/2" as const;