diff --git a/frontend-web/src/assets/img/blue-header.png b/frontend-web/src/assets/img/blue-header.png
new file mode 100644
index 00000000..5d904a2c
Binary files /dev/null and b/frontend-web/src/assets/img/blue-header.png differ
diff --git a/frontend-web/src/assets/img/dark-blue-header.svg b/frontend-web/src/assets/img/dark-blue-header.svg
new file mode 100644
index 00000000..27a56ee9
--- /dev/null
+++ b/frontend-web/src/assets/img/dark-blue-header.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="1920" height="62" viewBox="0 0 1920 62"><defs><style>.a{fill:url(#a);}.b{fill:rgba(0,98,217,0.1);}.c{fill:#fff;}.d{fill:rgba(0,98,217,0.2);}.e{filter:url(#h);}.f{filter:url(#e);}.g{filter:url(#b);}</style><linearGradient id="a" x1="0.5" x2="0.5" y2="1" gradientUnits="objectBoundingBox"><stop offset="0" stop-color="#0b3776"/><stop offset="1" stop-color="#0c1935"/></linearGradient><filter id="b"><feOffset dy="-3" input="SourceAlpha"/><feGaussianBlur result="c"/><feFlood flood-color="#0062d9" flood-opacity="0.102" result="d"/><feComposite operator="out" in="SourceGraphic" in2="c"/><feComposite operator="in" in="d"/><feComposite operator="in" in2="SourceGraphic"/></filter><filter id="e"><feOffset dy="-3" input="SourceAlpha"/><feGaussianBlur result="f"/><feFlood flood-color="#0062d9" flood-opacity="0.102" result="g"/><feComposite operator="out" in="SourceGraphic" in2="f"/><feComposite operator="in" in="g"/><feComposite operator="in" in2="SourceGraphic"/></filter><filter id="h"><feOffset dy="-3" input="SourceAlpha"/><feGaussianBlur result="i"/><feFlood flood-color="#0062d9" flood-opacity="0.2" result="j"/><feComposite operator="out" in="SourceGraphic" in2="i"/><feComposite operator="in" in="j"/><feComposite operator="in" in2="SourceGraphic"/></filter></defs><g transform="translate(-2009 -3361)"><rect class="a" width="1920" height="62" transform="translate(2009 3361)"/><g data-type="innerShadowGroup"><path class="b" d="M0,0H318L268,62H0Z" transform="translate(2009 3361)"/><g class="g" transform="matrix(1, 0, 0, 1, 2009, 3361)"><path class="c" d="M0,0H318L268,62H0Z"/></g></g><g data-type="innerShadowGroup"><path class="b" d="M0,0H310L260,62H0Z" transform="translate(2009 3361)"/><g class="f" transform="matrix(1, 0, 0, 1, 2009, 3361)"><path class="c" d="M0,0H310L260,62H0Z"/></g></g><g data-type="innerShadowGroup"><path class="d" d="M0,0H302L252,62H0Z" transform="translate(2009 3361)"/><g class="e" transform="matrix(1, 0, 0, 1, 2009, 3361)"><path class="c" d="M0,0H302L252,62H0Z"/></g></g></g></svg>
\ No newline at end of file
diff --git a/frontend-web/src/assets/img/red-header.png b/frontend-web/src/assets/img/red-header.png
new file mode 100644
index 00000000..39e82ed2
Binary files /dev/null and b/frontend-web/src/assets/img/red-header.png differ
diff --git a/frontend-web/src/roundtable-planning/components/Step3ReportMode.tsx b/frontend-web/src/roundtable-planning/components/Step3ReportMode.tsx
index a4c30959..65abc900 100644
--- a/frontend-web/src/roundtable-planning/components/Step3ReportMode.tsx
+++ b/frontend-web/src/roundtable-planning/components/Step3ReportMode.tsx
@@ -9,7 +9,7 @@
  *
  * 进入即自动开跑（`useStep3Report.start`），右上角「重新绘制」可重跑。
  */
-import { useEffect, useMemo, useRef, useState } from "react";
+import { useEffect, useMemo, useRef, useState, type FormEvent } from "react";
 import ReactMarkdown from "react-markdown";
 import remarkGfm from "remark-gfm";
 import {
@@ -23,6 +23,7 @@ import {
   PanelLeftClose,
   PanelLeftOpen,
   RefreshCw,
+  SendHorizontal,
   Sparkles,
   X,
 } from "lucide-react";
@@ -197,7 +198,7 @@ export function Step3ReportMode({
         <div className="flex items-center gap-2">
           <button
             type="button"
-            onClick={redraw}
+            onClick={() => redraw()}
             disabled={phase === "creating" || phase === "streaming"}
             className="bg-white border border-slate-200 text-slate-700 hover:bg-slate-50 disabled:opacity-50 disabled:cursor-not-allowed text-[10.5px] font-bold px-3 py-1.5 rounded-xl flex items-center gap-1 transition"
           >
@@ -311,6 +312,7 @@ export function Step3ReportMode({
               dialogues={dialogues}
               error={error}
               onRetry={redraw}
+              onRevisionSubmit={redraw}
               onArtifactStepClick={openArtifactFromStep}
               onArtifactPreview={openArtifactPreview}
               selectedModel={selectedModel}
@@ -432,6 +434,7 @@ function AgentProgressPanel({
   dialogues,
   error,
   onRetry,
+  onRevisionSubmit,
   onArtifactStepClick,
   onArtifactPreview,
   selectedModel,
@@ -443,6 +446,7 @@ function AgentProgressPanel({
   dialogues: ReturnType<typeof useStep3Report>["dialogues"];
   error: string | null;
   onRetry: () => void;
+  onRevisionSubmit: (revisionInstruction: string) => void;
   onArtifactStepClick: ReturnType<typeof useStep3Report>["openArtifactFromStep"];
   onArtifactPreview: ReturnType<typeof useStep3Report>["openArtifactPreview"];
   selectedModel: string;
@@ -453,6 +457,15 @@ function AgentProgressPanel({
   const busy = phase === "creating" || phase === "streaming";
   const scrollRef = useRef<HTMLDivElement>(null);
   const { atBottom, scrollToBottom } = useAutoScroll(scrollRef, [dialogues]);
+  const [revisionText, setRevisionText] = useState("");
+
+  const handleRevisionSubmit = (e: FormEvent<HTMLFormElement>) => {
+    e.preventDefault();
+    const text = revisionText.trim();
+    if (!text || busy) return;
+    setRevisionText("");
+    onRevisionSubmit(text);
+  };
 
   return (
     <div className="flex h-full min-h-0 flex-col bg-slate-50/20">
@@ -549,6 +562,39 @@ function AgentProgressPanel({
           )}
         </div>
         {!atBottom && <ScrollToBottomButton onClick={scrollToBottom} />}
+        <form
+          onSubmit={handleRevisionSubmit}
+          className="shrink-0 border-t border-slate-100 bg-white px-3 py-3"
+        >
+          <div className="flex items-end gap-2 rounded-2xl border border-slate-200 bg-slate-50/70 px-3 py-2 focus-within:border-primary/60 focus-within:bg-white focus-within:ring-2 focus-within:ring-[var(--brand-200)]/40">
+            <textarea
+              value={revisionText}
+              onChange={(e) => setRevisionText(e.target.value)}
+              onKeyDown={(e) => {
+                if (e.key === "Enter" && !e.shiftKey) {
+                  e.preventDefault();
+                  e.currentTarget.form?.requestSubmit();
+                }
+              }}
+              disabled={busy}
+              rows={1}
+              placeholder="输入修改要求，例如：把右侧页面改成深色风格，并增加风险矩阵"
+              className="min-h-8 max-h-28 flex-1 resize-none bg-transparent py-1.5 text-xs leading-relaxed text-slate-800 placeholder:text-slate-400 focus:outline-none disabled:cursor-not-allowed disabled:opacity-60"
+            />
+            <button
+              type="submit"
+              disabled={busy || revisionText.trim().length === 0}
+              title={busy ? "正在绘制，请稍后发送" : "发送修改要求"}
+              className="mb-0.5 flex h-8 w-8 shrink-0 items-center justify-center rounded-xl bg-primary text-white transition hover:bg-[var(--brand-900)] disabled:cursor-not-allowed disabled:opacity-50"
+            >
+              {busy ? (
+                <Loader2 className="h-4 w-4 animate-spin" />
+              ) : (
+                <SendHorizontal className="h-4 w-4" />
+              )}
+            </button>
+          </div>
+        </form>
       </div>
     </div>
   );
diff --git a/frontend-web/src/roundtable-planning/hooks/useStep3Report.ts b/frontend-web/src/roundtable-planning/hooks/useStep3Report.ts
index 72f05b81..b6102430 100644
--- a/frontend-web/src/roundtable-planning/hooks/useStep3Report.ts
+++ b/frontend-web/src/roundtable-planning/hooks/useStep3Report.ts
@@ -72,11 +72,11 @@ export interface UseStep3ReportReturn {
   /** 当前沙箱预览绑定的 thread id（这里恒为报告线程）。 */
   activeArtifactThreadId: string | null;
   /** 启动绘制（幂等：进行中重复调用会被忽略）。 */
-  start: () => void;
+  start: (revisionInstruction?: string) => void;
   /** 从草稿快照恢复展示（建合成 stub + 气泡 + 打开沙箱，phase=done，不重新绘制）。 */
   hydrateSaved: (snapshot: DraftStep3Snapshot) => void;
   /** 重新绘制（先中断在途请求再重跑）。 */
-  redraw: () => void;
+  redraw: (revisionInstruction?: string) => void;
   /** 中断在途请求（卸载 / 切回普通视图时调用）。 */
   abort: () => void;
   /** 点击气泡内工具步骤时打开沙箱（与第 2 步 openArtifactFromStep 同义）。 */
@@ -92,8 +92,10 @@ function buildReportPrompt(opts: {
   intentReady: ReportIntent | null;
   seatDeliveries: ReportSeatDelivery[];
   consensusText: string;
+  revisionInstruction?: string;
+  previousHtml?: string;
 }): string {
-  const { intentReady, seatDeliveries, consensusText } = opts;
+  const { intentReady, seatDeliveries, consensusText, revisionInstruction, previousHtml } = opts;
   const parts: string[] = [];
   parts.push(
     "请基于以下圆桌多智能体研讨的成果，撰写一份图文并茂、以文字叙述为主线的 HTML「方案研讨汇报」，" +
@@ -135,6 +137,23 @@ function buildReportPrompt(opts: {
     parts.push("");
   }
 
+  const cleanRevisionInstruction = revisionInstruction?.trim();
+  if (cleanRevisionInstruction) {
+    parts.push("# User revision request");
+    parts.push(cleanRevisionInstruction);
+    parts.push("");
+    if (previousHtml?.trim()) {
+      parts.push("# Previous rendered HTML to revise");
+      parts.push(
+        "Use this as the baseline. Preserve parts not contradicted by the revision request, and output a complete updated self-contained HTML file.",
+      );
+      parts.push("```html");
+      parts.push(previousHtml.trim());
+      parts.push("```");
+      parts.push("");
+    }
+  }
+
   parts.push(
     "请严格遵循你的职责设定：自包含离线（纯 inline SVG 图表、禁止任何外链 CDN）、研讨叙事型结构" +
       "（结论+KPI → 背景目标 → 各席位观点 → 综合分析 → 最终共识方案 → 执行路线）、" +
@@ -173,7 +192,7 @@ function reportPhaseLabel(phase: StreamPhase, toolName?: string): string {
 export function useStep3Report(
   options: UseStep3ReportOptions,
 ): UseStep3ReportReturn {
-  const { intentReady, seatDeliveries, consensusText, selectedModel, onReportSaved } =
+  const { intentReady, seatDeliveries, consensusText, selectedModel, savedReport, onReportSaved } =
     options;
 
   // onReportSaved 身份可能每次 render 变 —— 打到 ref，避免进 run() 的 deps 反复重建。
@@ -601,7 +620,7 @@ export function useStep3Report(
     runningRef.current = false;
   }, []);
 
-  const run = useCallback(async () => {
+  const run = useCallback(async (revisionInstruction?: string) => {
     if (runningRef.current) return;
     runningRef.current = true;
     setError(null);
@@ -632,7 +651,13 @@ export function useStep3Report(
       );
       setPhase("streaming");
 
-      const prompt = buildReportPrompt({ intentReady, seatDeliveries, consensusText });
+      const prompt = buildReportPrompt({
+        intentReady,
+        seatDeliveries,
+        consensusText,
+        revisionInstruction,
+        previousHtml: savedReport?.html,
+      });
       const res = await streamMultiAgent({
         agentType: "special",
         agentName,
@@ -687,6 +712,7 @@ export function useStep3Report(
     intentReady,
     seatDeliveries,
     consensusText,
+    savedReport?.html,
     selectedModel,
     appendStreamingDialogue,
     appendToDialogue,
@@ -699,8 +725,8 @@ export function useStep3Report(
     reconcileStubFromRealFile,
   ]);
 
-  const start = useCallback(() => {
-    void run();
+  const start = useCallback((revisionInstruction?: string) => {
+    void run(revisionInstruction);
   }, [run]);
 
   // 从草稿快照恢复：不跑 SSE，用保存的 HTML 重建一条「完成」气泡 + 合成 stub，
@@ -766,9 +792,9 @@ export function useStep3Report(
     [abort, buildWriteFileVirtualUrl, openArtifact],
   );
 
-  const redraw = useCallback(() => {
+  const redraw = useCallback((revisionInstruction?: string) => {
     abort();
-    void run();
+    void run(revisionInstruction);
   }, [abort, run]);
 
   return {