diff --git a/frontend/src/components/Chat.tsx b/frontend/src/components/Chat.tsx
index 2d6ca6f..4afd63c 100644
--- a/frontend/src/components/Chat.tsx
+++ b/frontend/src/components/Chat.tsx
@@ -1,9 +1,10 @@
 import { useEffect, useRef, useState } from "react";
 import { Archive, ArchiveRestore, BookOpen, Bot, Check, Copy, Cpu, FileText, Flag, Menu, PanelLeftOpen, Paperclip, ScanText, Search, SendHorizontal, Share2, User as UserIcon, X } from "lucide-react";
 import type { Attachment, ChatMessage, Conversation, DriverModel, User } from "../lib/types.ts";
-import { api, type ReportReason } from "../lib/api.ts";
+import { api, ApiError, type ReportReason } from "../lib/api.ts";
 import { AssistantAvatar, Avatar, Button, Field, FlowerMark, IconButton, Modal, Picker, type PickerGroup, Spinner } from "./ui.tsx";
 import { Markdown } from "./Markdown.tsx";
+import { UserMessageContent } from "./MessageContent.tsx";
 import { cn } from "../lib/cn.ts";
 import { useFeatures } from "../lib/features.ts";
 import { useT, type StringKey } from "../lib/i18n.ts";
@@ -34,8 +35,8 @@ function MessageBubble({ msg, index, authorAvatar, authorName, onReport }: { msg
           {isUser ? t("chat.you") : "KisAssistant"}
         </div>
         {isUser ? (
-          <div className="whitespace-pre-wrap rounded-3xl rounded-tr-lg bg-accent-600 px-4 py-2.5 text-[15px] text-white dark:bg-accent-500 dark:text-zinc-950">
-            {msg.content}
+          <div className="break-words whitespace-pre-wrap rounded-3xl rounded-tr-lg bg-accent-600 px-4 py-2.5 text-[15px] text-white dark:bg-accent-500 dark:text-zinc-950">
+            <UserMessageContent content={msg.content} />
           </div>
         ) : (
           <div className="rounded-3xl rounded-tl-lg border border-stone-200/70 bg-white px-5 py-3.5 shadow-sm dark:border-zinc-800 dark:bg-zinc-900">
@@ -60,12 +61,13 @@ function MessageBubble({ msg, index, authorAvatar, authorName, onReport }: { msg
   );
 }
 
-function ReportDialog({ open, onClose, conversationId, messageIndex, content, model }: {
+function ReportDialog({ open, onClose, conversationId, messageIndex, content, prompt, model }: {
   open: boolean;
   onClose: () => void;
   conversationId: string | null;
   messageIndex: number;
   content: string;
+  prompt: string;
   model: string;
 }) {
   const { t } = useT();
@@ -74,6 +76,7 @@ function ReportDialog({ open, onClose, conversationId, messageIndex, content, mo
   const [busy, setBusy] = useState(false);
   const [error, setError] = useState("");
   const [sent, setSent] = useState(false);
+  const [duplicate, setDuplicate] = useState(false);
 
   useEffect(() => {
     if (open) {
@@ -81,6 +84,7 @@ function ReportDialog({ open, onClose, conversationId, messageIndex, content, mo
       setDetails("");
       setError("");
       setSent(false);
+      setDuplicate(false);
     }
   }, [open, messageIndex]);
 
@@ -96,11 +100,16 @@ function ReportDialog({ open, onClose, conversationId, messageIndex, content, mo
         reason: reason as ReportReason,
         details: details.trim(),
         content,
+        prompt,
         model,
       });
       setSent(true);
     } catch (err) {
-      setError(err instanceof Error ? err.message : t("report.failed"));
+      if (err instanceof ApiError && err.status === 409) {
+        setDuplicate(true);
+      } else {
+        setError(err instanceof Error ? err.message : t("report.failed"));
+      }
     } finally {
       setBusy(false);
     }
@@ -108,7 +117,16 @@ function ReportDialog({ open, onClose, conversationId, messageIndex, content, mo
 
   return (
     <Modal open={open} onClose={onClose} title={t("report.title")} icon={Flag}>
-      {sent ? (
+      {sent || duplicate ? (
+        <div className="space-y-4">
+          <p className="flex items-center gap-2 rounded-2xl bg-emerald-600/10 px-4 py-3 text-sm text-emerald-700 dark:text-emerald-400">
+            <Check size={16} /> {duplicate ? t("report.alreadyReported") : t("report.sent")}
+          </p>
+          <div className="flex justify-end">
+            <Button variant="secondary" onClick={onClose}>{t("common.close")}</Button>
+          </div>
+        </div>
+      ) : (
         <div className="space-y-4">
           <p className="flex items-center gap-2 rounded-2xl bg-emerald-600/10 px-4 py-3 text-sm text-emerald-700 dark:text-emerald-400">
             <Check size={16} /> {t("report.sent")}
@@ -429,6 +447,7 @@ export function Chat({
       {(() => {
         const shown = messages.filter((m) => m.role !== "system");
         const target = reportIndex !== null ? shown[reportIndex] : undefined;
+        const prev = reportIndex !== null && reportIndex > 0 ? shown[reportIndex - 1] : undefined;
         return (
           <ReportDialog
             open={reportIndex !== null}
@@ -436,6 +455,7 @@ export function Chat({
             conversationId={conv?.id ?? null}
             messageIndex={reportIndex ?? 0}
             content={target?.content ?? ""}
+            prompt={prev && prev.role === "user" ? prev.content : ""}
             model={conv?.model || model}
           />
         );
diff --git a/frontend/src/components/MessageContent.tsx b/frontend/src/components/MessageContent.tsx
index 2536cd0..1075580 100644
--- a/frontend/src/components/MessageContent.tsx
+++ b/frontend/src/components/MessageContent.tsx
@@ -16,11 +16,16 @@ import { cn } from "../lib/cn.ts";
  */
 const ATTACH_RE = /^(\[.*?\])\n```text\n([\s\S]*?)\n```/gm;
 
-function AttachmentBlock({ header, body }: { header: string; body: string }) {
+function AttachmentBlock({ header, body, tone }: { header: string; body: string; tone: "accent" | "plain" }) {
   const [open, setOpen] = useState(false);
   const label = header.startsWith("[") && header.endsWith("]") ? header.slice(1, -1) : header;
   return (
-    <span className="mt-2 block overflow-hidden rounded-2xl bg-black/25 text-left dark:bg-black/30">
+    <span
+      className={cn(
+        "mt-2 block overflow-hidden rounded-2xl text-left",
+        tone === "accent" ? "bg-black/25 dark:bg-black/30" : "bg-stone-200/70 dark:bg-zinc-800",
+      )}
+    >
       <button
         type="button"
         onClick={() => setOpen((v) => !v)}
@@ -35,7 +40,12 @@ function AttachmentBlock({ header, body }: { header: string; body: string }) {
         />
       </button>
       {open && (
-        <pre className="max-h-72 overflow-auto whitespace-pre-wrap break-words border-t border-white/10 px-3 py-2 font-mono text-[12.5px] leading-relaxed">
+        <pre
+          className={cn(
+            "max-h-72 overflow-auto whitespace-pre-wrap break-words border-t px-3 py-2 font-mono text-[12.5px] leading-relaxed",
+            tone === "accent" ? "border-white/10" : "border-stone-300/70 dark:border-zinc-700",
+          )}
+        >
           {body}
         </pre>
       )}
@@ -43,7 +53,7 @@ function AttachmentBlock({ header, body }: { header: string; body: string }) {
   );
 }
 
-export function UserMessageContent({ content }: { content: string }) {
+export function UserMessageContent({ content, tone = "accent" }: { content: string; tone?: "accent" | "plain" }) {
   const parts: React.ReactNode[] = [];
   let last = 0;
   let key = 0;
@@ -51,7 +61,7 @@ export function UserMessageContent({ content }: { content: string }) {
   let m: RegExpExecArray | null;
   while ((m = ATTACH_RE.exec(content)) !== null) {
     if (m.index > last) parts.push(<span key={key++}>{content.slice(last, m.index)}</span>);
-    parts.push(<AttachmentBlock key={key++} header={m[1]!} body={m[2] ?? ""} />);
+    parts.push(<AttachmentBlock key={key++} header={m[1]!} body={m[2] ?? ""} tone={tone} />);
     last = m.index + m[0].length;
   }
   if (last < content.length) parts.push(<span key={key++}>{content.slice(last)}</span>);
diff --git a/frontend/src/components/ReportsPanel.tsx b/frontend/src/components/ReportsPanel.tsx
index 69d1132..929e8b8 100644
--- a/frontend/src/components/ReportsPanel.tsx
+++ b/frontend/src/components/ReportsPanel.tsx
@@ -1,7 +1,7 @@
 import { useEffect, useRef, useState } from "react";
-import { CheckCircle2, Clock, Flag, Inbox, Search, Undo2, XCircle } from "lucide-react";
+import { CheckCircle2, Clock, Eye, EyeOff, Flag, Inbox, Search, Undo2, XCircle } from "lucide-react";
 import { api, type Report, type ReportStatus } from "../lib/api.ts";
-import { Button, Field, Input, Spinner } from "./ui.tsx";
+import { Button, ConfirmDialog, Field, Input, Spinner } from "./ui.tsx";
 import { useT, type StringKey } from "../lib/i18n.ts";
 import { cn } from "../lib/cn.ts";
 
@@ -118,6 +118,11 @@ export function ReportsPanel() {
               <span className={cn("shrink-0 rounded-full px-2.5 py-1 text-xs font-medium", STATUS_STYLE[r.status].cls)}>
                 {t(`reports.status.${r.status}` as StringKey)}
               </span>
+              {r.reporter_shadowbanned === 1 && (
+                <span className="shrink-0 rounded-full bg-stone-500/10 px-2.5 py-1 text-xs font-medium opacity-70">
+                  {t("reports.unreliable")}
+                </span>
+              )}
             </button>
             {selectedId === r.id && <ReportDetail report={r} onChanged={() => refresh(r.id)} />}
           </li>
diff --git a/frontend/src/components/SharePage.tsx b/frontend/src/components/SharePage.tsx
index 8fad9ab..173e7ba 100644
--- a/frontend/src/components/SharePage.tsx
+++ b/frontend/src/components/SharePage.tsx
@@ -4,6 +4,7 @@ import { api } from "../lib/api.ts";
 import type { SharedChat } from "../lib/types.ts";
 import { AssistantAvatar, Avatar, FlowerMark } from "./ui.tsx";
 import { Markdown } from "./Markdown.tsx";
+import { UserMessageContent } from "./MessageContent.tsx";
 import { useT } from "../lib/i18n.ts";
 
 export function SharePage({ publicId }: { publicId: string }) {
@@ -80,7 +81,7 @@ export function SharePage({ publicId }: { publicId: string }) {
                 {m.role === "user" ? chat.authorName : "KisAssistant"}
               </div>
               {m.role === "user" ? (
-                <div className="whitespace-pre-wrap rounded-3xl rounded-tl-lg border border-stone-200/70 bg-white px-5 py-3 text-[15px] dark:border-zinc-800 dark:bg-zinc-900">{m.content}</div>
+                <div className="break-words whitespace-pre-wrap rounded-3xl rounded-tl-lg border border-stone-200/70 bg-white px-5 py-3 text-[15px] dark:border-zinc-800 dark:bg-zinc-900"><UserMessageContent content={m.content} tone="plain" /></div>
               ) : (
                 <div className="rounded-3xl rounded-tl-lg border border-stone-200/70 bg-white px-5 py-3.5 shadow-sm dark:border-zinc-800 dark:bg-zinc-900">
                   <Markdown text={m.content} />
diff --git a/frontend/src/lib/api.ts b/frontend/src/lib/api.ts
index 8acb851..86e0c27 100644
--- a/frontend/src/lib/api.ts
+++ b/frontend/src/lib/api.ts
@@ -135,6 +135,11 @@ export const api = {
     req<{ user: User; key: string }>("/api/admin/users", { method: "POST", body: JSON.stringify(u) }),
   adminDelete: (id: string) => req<{ ok: boolean }>(`/api/admin/users/${id}`, { method: "DELETE" }),
   adminRegenerate: (id: string) => req<{ key: string }>(`/api/admin/users/${id}/regenerate`, { method: "POST" }),
+  adminShadowban: (id: string, shadowbanned: boolean) =>
+    req<{ shadowbanned: boolean }>(`/api/admin/users/${id}/shadowban`, {
+      method: "POST",
+      body: JSON.stringify({ shadowbanned }),
+    }),
   adminPatch: (id: string, patch: { displayName?: string; avatarUrl?: string; theme?: string; email?: string }) =>
     req<{ user: User }>(`/api/admin/users/${id}`, { method: "PATCH", body: JSON.stringify(patch) }),