diff --git a/frontend-web/src/core/embed/background.ts b/frontend-web/src/core/embed/background.ts
new file mode 100644
index 00000000..5b88656a
--- /dev/null
+++ b/frontend-web/src/core/embed/background.ts
@@ -0,0 +1,88 @@
+import { useEffect, useMemo, useState } from "react";
+import { useLocation } from "react-router-dom";
+
+/**
+ * 公开页（被第三方 iframe 嵌套）的可配置背景色。
+ *
+ * 这些 `/public/*`、`/share/*`、`/roundtable-share/*` 页面会被别的系统用
+ * `<iframe>` 嵌进去。嵌套方希望背景色跟自己的站点保持一致,所以我们把
+ * 「背景色 / 前景文字色」抽成可外部传入的参数,两种传法都支持:
+ *
+ * 1. URL 查询参数(嵌套时一次性指定,最常用):
+ *    `<iframe src=".../#/public/leaderboard?bg=%23ffffff&text=%23111111">`
+ *    —— `bg`/`background` 设背景,`text`/`fg` 设文字色。
+ * 2. `postMessage`(嵌套后动态切换,比如宿主切主题时同步):
+ *    `iframe.contentWindow.postMessage({ type: "deerflow:set-bg", bg: "#fff", text: "#111" }, "*")`
+ *
+ * 不传时返回空对象,页面沿用自带的默认配色(Tailwind 类),互不影响。
+ */
+export type PublicBackground = {
+  backgroundColor?: string;
+  color?: string;
+};
+
+const HEX_RE = /^#?(?:[0-9a-fA-F]{3}|[0-9a-fA-F]{4}|[0-9a-fA-F]{6}|[0-9a-fA-F]{8})$/;
+// 允许的非 hex 颜色:rgb()/rgba()/hsl()/hsla() 与简单命名色。限定安全字符集,
+// 既能覆盖常见写法,又能挡掉任何想塞进内联样式的奇怪内容。
+const SAFE_COLOR_RE = /^[a-zA-Z]+$|^(?:rgb|rgba|hsl|hsla)\(\s*[0-9.,%\s/]+\)$/;
+
+/** 把外部传入的颜色串规整成可用的 CSS 颜色;非法/为空时返回 undefined。 */
+export function normalizeCssColor(raw: string | null | undefined): string | undefined {
+  if (!raw) return undefined;
+  const value = raw.trim();
+  if (!value) return undefined;
+  if (HEX_RE.test(value)) return value.startsWith("#") ? value : `#${value}`;
+  if (SAFE_COLOR_RE.test(value)) return value;
+  return undefined;
+}
+
+function readFromSearch(search: string): PublicBackground {
+  const params = new URLSearchParams(search.startsWith("?") ? search : `?${search}`);
+  const backgroundColor = normalizeCssColor(params.get("bg") ?? params.get("background"));
+  const color = normalizeCssColor(params.get("text") ?? params.get("fg"));
+  const result: PublicBackground = {};
+  if (backgroundColor) result.backgroundColor = backgroundColor;
+  if (color) result.color = color;
+  return result;
+}
+
+/**
+ * 读取公开页背景配置,可直接 `style={...}` 展开到页面根容器。
+ *
+ * 合并两处来源:HashRouter 路由内的查询串(`?bg=` 跟在 `#/路由` 后面)以及
+ * `window.location.search`(`?bg=` 在 `#` 前面);路由内的更贴近当前页,优先级更高。
+ * 同时监听 `postMessage` 以支持嵌套后动态改色。
+ */
+export function usePublicBackground(): PublicBackground {
+  const location = useLocation();
+
+  const fromUrl = useMemo<PublicBackground>(() => {
+    const outer = readFromSearch(typeof window !== "undefined" ? window.location.search : "");
+    const inner = readFromSearch(location.search);
+    return { ...outer, ...inner };
+  }, [location.search]);
+
+  const [override, setOverride] = useState<PublicBackground>({});
+
+  useEffect(() => {
+    function onMessage(event: MessageEvent) {
+      const data = event.data as
+        | { type?: string; bg?: string; background?: string; text?: string; fg?: string }
+        | null;
+      if (!data || typeof data !== "object") return;
+      if (data.type !== "deerflow:set-bg" && data.type !== "deerflow:set-background") return;
+      setOverride((prev) => {
+        const next: PublicBackground = { ...prev };
+        const bg = normalizeCssColor(data.bg ?? data.background);
+        const text = normalizeCssColor(data.text ?? data.fg);
+        if (bg) next.backgroundColor = bg;
+        if (text) next.color = text;
+        return next;
+      });
+    }
+    window.addEventListener("message", onMessage);
+    return () => window.removeEventListener("message", onMessage);
+  }, []);
+
+  return useMemo(() => ({ ...fromUrl, ...override }), [fromUrl, override]);
+}
diff --git a/frontend-web/src/pages/PublicLeaderboardPage.tsx b/frontend-web/src/pages/PublicLeaderboardPage.tsx
index 8513f106..764a01db 100644
--- a/frontend-web/src/pages/PublicLeaderboardPage.tsx
+++ b/frontend-web/src/pages/PublicLeaderboardPage.tsx
@@ -44,6 +44,7 @@ import type {
   AdminLeaderboardUser,
 } from "@/core/admin/api";
 import { getBackendBaseURL } from "@/core/config";
+import { usePublicBackground } from "@/core/embed/background";
 import { cn } from "@/lib/utils";
 
 type UserRankTab = "activity" | "questions" | "tokens" | "skills" | "efficiency";
@@ -151,6 +152,8 @@ export default function PublicLeaderboardPage() {
   const [query, setQuery] = useState("");
   const [userPage, setUserPage] = useState(1);
   const days = RANGE_DAYS;
+  // 被第三方 iframe 嵌套时,允许嵌套方通过 ?bg=/?text= 或 postMessage 改背景/文字色。
+  const pageBg = usePublicBackground();
 
   useEffect(() => {
     let cancelled = false;
@@ -222,7 +225,7 @@ export default function PublicLeaderboardPage() {
   }, [userPageCount]);
 
   return (
-    <div className="min-h-screen w-full bg-[#FFF7F7] text-[#231815] dark:bg-[#011226] dark:text-white">
+    <div className="min-h-screen w-full bg-[#FFF7F7] text-[#231815] dark:bg-[#011226] dark:text-white" style={pageBg}>
       <div className="mx-auto w-full max-w-6xl px-4 py-8 sm:px-6 sm:py-10">
         {/* 标题区：仅展示，不含任何操作按钮 */}
         <header className="mb-6">
diff --git a/frontend-web/src/pages/PublicRoundtableSharePage.tsx b/frontend-web/src/pages/PublicRoundtableSharePage.tsx
index 9c280c62..c64a0d70 100644
--- a/frontend-web/src/pages/PublicRoundtableSharePage.tsx
+++ b/frontend-web/src/pages/PublicRoundtableSharePage.tsx
@@ -19,6 +19,7 @@ import {
   getPublicDraftShareSnapshot,
   type PublicDraftSeatDelivery,
 } from "@/core/roundtable-draft-shares/api";
+import { usePublicBackground } from "@/core/embed/background";
 import { markdownComponents } from "@/roundtable-planning/components/markdown-components";
 
 /** 各席位最终交付 —— 折叠手风琴（仿 HighFidelityReport 第二区块）。 */
@@ -96,6 +97,8 @@ export default function PublicRoundtableSharePage({
   report?: boolean;
 }) {
   const { shareCode } = useParams<{ shareCode: string }>();
+  // 嵌套方可用 ?bg=/?text= 或 postMessage 覆盖背景/文字色。
+  const pageBg = usePublicBackground();
 
   const { data, isLoading, isError } = useQuery({
     queryKey: ["public-roundtable-share", shareCode],
@@ -107,7 +110,7 @@ export default function PublicRoundtableSharePage({
 
   if (isLoading) {
     return (
-      <div className="bg-background text-muted-foreground flex h-screen items-center justify-center gap-2 text-sm">
+      <div className="bg-background text-muted-foreground flex h-screen items-center justify-center gap-2 text-sm" style={pageBg}>
         <Loader2 className="size-4 animate-spin" />
         正在加载分享内容…
       </div>
@@ -116,7 +119,7 @@ export default function PublicRoundtableSharePage({
 
   if (isError || !data) {
     return (
-      <div className="bg-background flex h-screen flex-col items-center justify-center gap-2 px-6 text-center">
+      <div className="bg-background flex h-screen flex-col items-center justify-center gap-2 px-6 text-center" style={pageBg}>
         <p className="text-lg font-medium">分享不可用</p>
         <p className="text-muted-foreground text-sm">
           该分享链接不存在、已被撤销，或不是只读分享。
@@ -128,7 +131,7 @@ export default function PublicRoundtableSharePage({
   // ── 报告页：整页沙箱 iframe 展示第 3 步结果绘制 ──────────────────────────────
   if (report) {
     return (
-      <div className="bg-background flex h-screen flex-col">
+      <div className="bg-background flex h-screen flex-col" style={pageBg}>
         <header className="flex shrink-0 items-center gap-2 border-b px-6 py-3">
           <h1 className="truncate text-base font-semibold">
             {data.title || "未命名会商"}
@@ -162,7 +165,7 @@ export default function PublicRoundtableSharePage({
   const reportUrl = `${window.location.origin}${window.location.pathname}#/roundtable-share/${shareCode}/report`;
 
   return (
-    <div className="bg-[#fef6f6] flex h-screen flex-col text-slate-800">
+    <div className="bg-[#fef6f6] flex h-screen flex-col text-slate-800" style={pageBg}>
       <header className="flex shrink-0 flex-col gap-1 border-b border-slate-100 bg-white px-6 py-3">
         <div className="flex items-center gap-2">
           <h1 className="truncate text-base font-semibold">
diff --git a/frontend-web/src/pages/PublicScheduledTaskPage.tsx b/frontend-web/src/pages/PublicScheduledTaskPage.tsx
index e3e251f3..76ec60ec 100644
--- a/frontend-web/src/pages/PublicScheduledTaskPage.tsx
+++ b/frontend-web/src/pages/PublicScheduledTaskPage.tsx
@@ -43,6 +43,7 @@ import {
 import { MarkdownContent } from "@/components/workspace/messages/markdown-content";
 import { HtmlPreviewFrame } from "@/components/html-preview-frame";
 import { getBackendBaseURL } from "@/core/config";
+import { usePublicBackground } from "@/core/embed/background";
 import { downloadMarkdownAsDocx } from "@/core/scheduled-tasks/markdown-docx";
 import { reasoningPlugins } from "@/core/streamdown";
 import { cn } from "@/lib/utils";
@@ -289,6 +290,8 @@ export default function PublicScheduledTaskPage() {
   const [runListWidth, setRunListWidth] = useState(RUN_LIST_DEFAULT_WIDTH);
   const dragStateRef = useRef<{ startX: number; startWidth: number } | null>(null);
   const queryClient = useQueryClient();
+  // 嵌套方可用 ?bg=/?text= 或 postMessage 覆盖背景/文字色。
+  const pageBg = usePublicBackground();
 
   const { data, isLoading, isError, error } = useQuery({
     queryKey: ["public-scheduled-task", taskId],
@@ -405,7 +408,7 @@ export default function PublicScheduledTaskPage() {
 
   if (!taskId) {
     return (
-      <div className="text-muted-foreground flex h-screen items-center justify-center text-sm">
+      <div className="text-muted-foreground flex h-screen items-center justify-center text-sm" style={pageBg}>
         缺少任务 ID。请使用 <code className="mx-1">/public/scheduled-tasks/&lt;task_id&gt;</code>。
       </div>
     );
@@ -413,7 +416,7 @@ export default function PublicScheduledTaskPage() {
 
   if (isLoading) {
     return (
-      <div className="text-muted-foreground flex h-screen items-center justify-center gap-2 text-sm">
+      <div className="text-muted-foreground flex h-screen items-center justify-center gap-2 text-sm" style={pageBg}>
         <Loader2 className="size-4 animate-spin" />
         正在加载任务记录...
       </div>
@@ -422,7 +425,7 @@ export default function PublicScheduledTaskPage() {
 
   if (isError) {
     return (
-      <div className="text-destructive flex h-screen items-center justify-center text-sm">
+      <div className="text-destructive flex h-screen items-center justify-center text-sm" style={pageBg}>
         加载失败：{error instanceof Error ? error.message : "未知错误"}
       </div>
     );
@@ -430,7 +433,7 @@ export default function PublicScheduledTaskPage() {
 
   return (
     <TooltipProvider delayDuration={150}>
-      <div className="bg-muted/20 flex h-screen min-h-0 overflow-hidden p-4">
+      <div className="bg-muted/20 flex h-screen min-h-0 overflow-hidden p-4" style={pageBg}>
         <div
           className="relative flex min-h-0 shrink-0 transition-[width] duration-200 ease-out"
           style={{ width: visibleRunListWidth }}
@@ -1139,6 +1142,8 @@ function RunDetailPane({ run, taskId }: { run: PublicRun; taskId: string }) {
 
 export function PublicScheduledTaskFullscreenPage() {
   const { taskId, runId } = useParams<{ taskId: string; runId: string }>();
+  // 嵌套方可用 ?bg=/?text= 或 postMessage 覆盖背景/文字色。
+  const pageBg = usePublicBackground();
   const [searchParams] = useSearchParams();
   const requestedTab = searchParams.get("tab");
   const tabKind: ContentTab["kind"] =
@@ -1194,7 +1199,7 @@ export function PublicScheduledTaskFullscreenPage() {
 
   return (
     <TooltipProvider delayDuration={150}>
-      <div className="bg-background flex h-screen min-h-0 flex-col">
+      <div className="bg-background flex h-screen min-h-0 flex-col" style={pageBg}>
         <div className="flex h-12 shrink-0 items-center gap-2 border-b px-3">
           <Button asChild variant="ghost" size="sm" className="h-8 px-2 text-xs">
             <a href={backHref}>
diff --git a/frontend-web/src/pages/PublicSharePage.tsx b/frontend-web/src/pages/PublicSharePage.tsx
index d7c2cf25..ab8fa5a7 100644
--- a/frontend-web/src/pages/PublicSharePage.tsx
+++ b/frontend-web/src/pages/PublicSharePage.tsx
@@ -14,6 +14,7 @@ import {
 import { MessageList } from "@/components/workspace/messages";
 import { ThreadContext } from "@/components/workspace/messages/context";
 import { SubtasksProvider } from "@/core/tasks/context";
+import { usePublicBackground } from "@/core/embed/background";
 import { getPublicShareSnapshot } from "@/core/thread-shares/api";
 import type { AgentThreadState } from "@/core/threads";
 
@@ -71,6 +72,8 @@ function PublicShareBody({
  */
 export default function PublicSharePage() {
   const { shareCode } = useParams<{ shareCode: string }>();
+  // 嵌套方可用 ?bg=/?text= 或 postMessage 覆盖背景/文字色。
+  const pageBg = usePublicBackground();
 
   const { data, isLoading, isError } = useQuery({
     queryKey: ["public-share", shareCode],
@@ -101,7 +104,7 @@ export default function PublicSharePage() {
 
   if (isLoading) {
     return (
-      <div className="bg-background text-muted-foreground flex h-screen items-center justify-center gap-2 text-sm">
+      <div className="bg-background text-muted-foreground flex h-screen items-center justify-center gap-2 text-sm" style={pageBg}>
         <Loader2 className="size-4 animate-spin" />
         正在加载分享内容…
       </div>
@@ -110,7 +113,7 @@ export default function PublicSharePage() {
 
   if (isError || !data) {
     return (
-      <div className="bg-background flex h-screen flex-col items-center justify-center gap-2 px-6 text-center">
+      <div className="bg-background flex h-screen flex-col items-center justify-center gap-2 px-6 text-center" style={pageBg}>
         <p className="text-lg font-medium">分享不可用</p>
         <p className="text-muted-foreground text-sm">
           该分享链接不存在、已被撤销，或不是只读分享。
@@ -120,7 +123,7 @@ export default function PublicSharePage() {
   }
 
   return (
-    <div className="bg-background flex h-screen flex-col">
+    <div className="bg-background flex h-screen flex-col" style={pageBg}>
       <header className="flex shrink-0 flex-col gap-1 border-b px-6 py-3">
         <div className="flex items-center gap-2">
           <h1 className="truncate text-base font-semibold">
diff --git a/frontend-web/src/strategy-components/Header.tsx b/frontend-web/src/strategy-components/Header.tsx
index e19189a2..8ff04b8d 100644
--- a/frontend-web/src/strategy-components/Header.tsx
+++ b/frontend-web/src/strategy-components/Header.tsx
@@ -1,4 +1,4 @@
-import { Bell, ChevronDown, FileText, Moon, Palette, User } from "lucide-react";
+import { Bell, ChevronDown, FileText, Moon, Palette, Trophy, User } from "lucide-react";
 import { useState } from "react";
 
 import { NotificationDialog } from "@/components/workspace/notification-dialog";
@@ -54,6 +54,26 @@ const Header = ({ collapsed }: HeaderProps) => {
               CM助手
             </span>
           )}
+
+          {/* 用户排行榜入口:紧挨 CM助手,点击在新标签打开免登录的公开排行榜页。 */}
+          <Button
+            type="button"
+            variant="ghost"
+            size="sm"
+            onClick={() =>
+              window.open("#/public/leaderboard", "_blank", "noopener")
+            }
+            title="打开用户排行榜公开页"
+            className={cn(
+              "h-8 shrink-0 gap-1.5 rounded-sm px-2 text-xs font-medium",
+              isDark
+                ? "text-slate-200 hover:bg-slate-800/50 hover:text-white"
+                : "text-white hover:bg-[var(--brand-950)] active:bg-[#8a0618]",
+            )}
+          >
+            <Trophy className="size-4" />
+            {!collapsed && <span>排行榜</span>}
+          </Button>
         </div>
 
         <div className="flex shrink-0 items-center gap-2">