diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index 4236363..5877de9 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -23,6 +23,7 @@ const HomePage = lazyWithRetry(() => import('./pages/HomePage'));
 const PostDetailPage = lazyWithRetry(() => import('./pages/PostDetailPage'));
 const LoginPage = lazyWithRetry(() => import('./pages/LoginPage'));
 const RegisterPage = lazyWithRetry(() => import('./pages/RegisterPage'));
+const ForgotPasswordPage = lazyWithRetry(() => import('./pages/ForgotPasswordPage'));
 const ComposePage = lazyWithRetry(() => import('./pages/ComposePage'));
 const BoardsManagePage = lazyWithRetry(() => import('./pages/BoardsManagePage'));
 const ProfilePage = lazyWithRetry(() => import('./pages/ProfilePage'));
@@ -45,6 +46,7 @@ const router = createBrowserRouter(
     <Route errorElement={<AppRouteError />}>
       <Route path="/login" element={<Suspense fallback={<AuthPageFallback />}><LoginPage /></Suspense>} />
       <Route path="/register" element={<Suspense fallback={<AuthPageFallback />}><RegisterPage /></Suspense>} />
+      <Route path="/forgot-password" element={<Suspense fallback={<AuthPageFallback />}><ForgotPasswordPage /></Suspense>} />
       <Route path="/boards" element={<Navigate to="/admin/boards" replace />} />
       <Route path="/admin" element={<AdminLayout />}>
         <Route index element={<Navigate to="/admin/dashboard" replace />} />
diff --git a/frontend/src/api/client.ts b/frontend/src/api/client.ts
index 31eefa5..768f434 100644
--- a/frontend/src/api/client.ts
+++ b/frontend/src/api/client.ts
@@ -400,6 +400,26 @@ export const api = {
       method: 'POST',
       body: JSON.stringify({ email }),
     }),
+  sendResetEmailCode: (email: string) =>
+    request<{ message: string }>('/api/password-reset/email-code', {
+      method: 'POST',
+      body: JSON.stringify({ email }),
+    }),
+  resetPassword: (data: { email: string; emailCode: string; newPassword: string }) =>
+    request<{ message: string }>('/api/password-reset', {
+      method: 'POST',
+      body: JSON.stringify({
+        email: data.email,
+        email_code: data.emailCode,
+        new_password: data.newPassword,
+      }),
+    }),
+  searchUsers: (q: string, limit = 8) => {
+    const sp = new URLSearchParams({ q, limit: String(limit) });
+    return request<{ users: Array<{ id: number; username: string; nickname: string; avatar?: string }> }>(
+      `/api/users/search?${sp}`,
+    );
+  },
   captcha: () => request<{ id: string; image: string }>('/api/captcha'),
   logout: () => request('/api/logout', { method: 'POST' }),
   like: (id: number) => request<{ liked: boolean; like_count: number }>(`/api/posts/${id}/like`, { method: 'POST' }),
diff --git a/frontend/src/components/CommentBox.tsx b/frontend/src/components/CommentBox.tsx
index 5fc7dbc..7e436ad 100644
--- a/frontend/src/components/CommentBox.tsx
+++ b/frontend/src/components/CommentBox.tsx
@@ -1,13 +1,15 @@
-import { useState, useRef, useEffect } from 'react';
+import { useState, useRef, useEffect, useCallback } from 'react';
 import { Link } from 'react-router-dom';
 import { Send } from 'lucide-react';
 import { Switch } from '@/components/ui/switch';
 import { Button } from '@/components/ui/button';
 import { notify } from '@/lib/notify';
+import { api } from '../api/client';
 import type { User, Comment } from '../api/types';
 import EmojiPicker from './EmojiPicker';
 import { commentNick } from '../utils/comment';
 import { loginPath, registerPath } from '../utils/authRedirect';
+import { cn } from '@/lib/utils';
 
 export interface CommentSubmitData {
   content: string;
@@ -24,14 +26,22 @@ interface Props {
   onCancelReply?: () => void;
 }
 
-/** 评论输入框：需登录后发表 */
+type MentionUser = { id: number; username: string; nickname: string; avatar?: string };
+
+/** 评论输入框：需登录后发表；支持 @ 用户补全 */
 export default function CommentBox({ user, replyTo, inline, submitting, submitCount = 0, onSubmit, onCancelReply }: Props) {
   const [content, setContent] = useState('');
   const [isPrivate, setIsPrivate] = useState(false);
   const [showEmoji, setShowEmoji] = useState(false);
+  const [mentionQuery, setMentionQuery] = useState<string | null>(null);
+  const [mentionStart, setMentionStart] = useState(-1);
+  const [mentionUsers, setMentionUsers] = useState<MentionUser[]>([]);
+  const [mentionIndex, setMentionIndex] = useState(0);
+  const [mentionLoading, setMentionLoading] = useState(false);
   const textareaRef = useRef<HTMLTextAreaElement>(null);
   const boxRef = useRef<HTMLDivElement>(null);
   const owoRef = useRef<HTMLButtonElement>(null);
+  const mentionTimer = useRef<number | null>(null);
 
   useEffect(() => {
     if (inline && replyTo) {
@@ -43,6 +53,8 @@ export default function CommentBox({ user, replyTo, inline, submitting, submitCo
     setContent('');
     setShowEmoji(false);
     setIsPrivate(false);
+    setMentionQuery(null);
+    setMentionUsers([]);
   }, [submitCount]);
 
   useEffect(() => {
@@ -67,21 +79,86 @@ export default function CommentBox({ user, replyTo, inline, submitting, submitCo
     };
   }, [showEmoji]);
 
-  const insertEmoji = (emoji: string) => {
-    const el = textareaRef.current;
-    if (el) {
-      const start = el.selectionStart ?? content.length;
-      const end = el.selectionEnd ?? content.length;
-      const next = content.slice(0, start) + emoji + content.slice(end);
-      setContent(next);
-      requestAnimationFrame(() => {
-        el.focus();
-        const pos = start + emoji.length;
-        el.setSelectionRange(pos, pos);
-      });
-    } else {
-      setContent((prev) => prev + emoji);
+  const closeMention = useCallback(() => {
+    setMentionQuery(null);
+    setMentionUsers([]);
+    setMentionIndex(0);
+    setMentionStart(-1);
+  }, []);
+
+  const scanMention = useCallback((text: string, caret: number) => {
+    const before = text.slice(0, caret);
+    const m = before.match(/@([\w\u4e00-\u9fa5_-]*)$/);
+    if (!m) {
+      closeMention();
+      return;
     }
+    const start = caret - m[0].length;
+    // @ 前须为行首或空白，避免邮箱等误触
+    if (start > 0 && !/\s/.test(text[start - 1])) {
+      closeMention();
+      return;
+    }
+    setMentionStart(start);
+    setMentionQuery(m[1] ?? '');
+  }, [closeMention]);
+
+  useEffect(() => {
+    if (mentionQuery === null) return;
+    if (mentionQuery.length === 0) {
+      setMentionUsers([]);
+      setMentionLoading(false);
+      return;
+    }
+    if (mentionTimer.current) window.clearTimeout(mentionTimer.current);
+    mentionTimer.current = window.setTimeout(() => {
+      setMentionLoading(true);
+      api.searchUsers(mentionQuery, 8)
+        .then((r) => {
+          setMentionUsers(r.users || []);
+          setMentionIndex(0);
+        })
+        .catch(() => setMentionUsers([]))
+        .finally(() => setMentionLoading(false));
+    }, 200);
+    return () => {
+      if (mentionTimer.current) window.clearTimeout(mentionTimer.current);
+    };
+  }, [mentionQuery]);
+
+  const insertAtCaret = (insert: string, replaceFrom?: number, replaceTo?: number) => {
+    const el = textareaRef.current;
+    if (!el) {
+      setContent((prev) => prev + insert);
+      return;
+    }
+    const start = replaceFrom ?? el.selectionStart ?? content.length;
+    const end = replaceTo ?? el.selectionEnd ?? content.length;
+    const next = content.slice(0, start) + insert + content.slice(end);
+    setContent(next);
+    requestAnimationFrame(() => {
+      el.focus();
+      const pos = start + insert.length;
+      el.setSelectionRange(pos, pos);
+    });
+  };
+
+  const insertEmoji = (emoji: string) => {
+    insertAtCaret(emoji);
+  };
+
+  const pickMention = (u: MentionUser) => {
+    if (mentionStart < 0) return;
+    const el = textareaRef.current;
+    const caret = el?.selectionStart ?? content.length;
+    insertAtCaret(`@${u.username} `, mentionStart, caret);
+    closeMention();
+  };
+
+  const handleChange = (e: React.ChangeEvent<HTMLTextAreaElement>) => {
+    const next = e.target.value;
+    setContent(next);
+    scanMention(next, e.target.selectionStart ?? next.length);
   };
 
   const handleSubmit = () => {
@@ -96,6 +173,28 @@ export default function CommentBox({ user, replyTo, inline, submitting, submitCo
   };
 
   const handleKeyDown = (e: React.KeyboardEvent) => {
+    if (mentionQuery !== null && mentionUsers.length > 0) {
+      if (e.key === 'ArrowDown') {
+        e.preventDefault();
+        setMentionIndex((i) => (i + 1) % mentionUsers.length);
+        return;
+      }
+      if (e.key === 'ArrowUp') {
+        e.preventDefault();
+        setMentionIndex((i) => (i - 1 + mentionUsers.length) % mentionUsers.length);
+        return;
+      }
+      if (e.key === 'Enter' || e.key === 'Tab') {
+        e.preventDefault();
+        pickMention(mentionUsers[mentionIndex]);
+        return;
+      }
+      if (e.key === 'Escape') {
+        e.preventDefault();
+        closeMention();
+        return;
+      }
+    }
     if (e.key === 'Enter' && (e.ctrlKey || e.metaKey)) {
       e.preventDefault();
       handleSubmit();
@@ -120,6 +219,7 @@ export default function CommentBox({ user, replyTo, inline, submitting, submitCo
 
   const avatarInitial = user.nickname?.[0] || '?';
   const canSend = !!content.trim() && !submitting;
+  const showMentionPopup = mentionQuery !== null && mentionQuery.length > 0;
 
   return (
     <div className="comment-box" ref={boxRef}>
@@ -144,13 +244,52 @@ export default function CommentBox({ user, replyTo, inline, submitting, submitCo
         )}
 
         <div className={`comment-box-input-wrap ${isPrivate ? 'private-mode' : ''}`}>
+          {showMentionPopup && (
+            <div className="comment-mention-popup" role="listbox" aria-label="提及用户">
+              {mentionLoading && mentionUsers.length === 0 ? (
+                <div className="comment-mention-empty">搜索中…</div>
+              ) : mentionUsers.length === 0 ? (
+                <div className="comment-mention-empty">没有匹配用户</div>
+              ) : (
+                mentionUsers.map((u, i) => (
+                  <button
+                    key={u.id}
+                    type="button"
+                    role="option"
+                    aria-selected={i === mentionIndex}
+                    className={cn('comment-mention-item', i === mentionIndex && 'active')}
+                    onMouseDown={(e) => {
+                      e.preventDefault();
+                      pickMention(u);
+                    }}
+                  >
+                    <span className="comment-mention-avatar" aria-hidden>
+                      {u.avatar
+                        ? <img src={u.avatar} alt="" />
+                        : (u.nickname?.[0] || u.username[0] || '?')}
+                    </span>
+                    <span className="comment-mention-meta">
+                      <span className="comment-mention-nick">{u.nickname || u.username}</span>
+                      <span className="comment-mention-user">@{u.username}</span>
+                    </span>
+                  </button>
+                ))
+              )}
+            </div>
+          )}
           <textarea
             ref={textareaRef}
             className="comment-box-textarea"
-            placeholder={isPrivate ? '正在隐私评论中...' : '说点什么吧'}
+            placeholder={isPrivate ? '正在隐私评论中...' : '说点什么吧，可用 @ 提及用户'}
             value={content}
-            onChange={(e) => setContent(e.target.value)}
+            onChange={handleChange}
             onKeyDown={handleKeyDown}
+            onClick={(e) => scanMention(content, e.currentTarget.selectionStart ?? content.length)}
+            onKeyUp={(e) => {
+              if (['ArrowLeft', 'ArrowRight', 'Home', 'End'].includes(e.key)) {
+                scanMention(content, e.currentTarget.selectionStart ?? content.length);
+              }
+            }}
             rows={3}
           />
           <button
diff --git a/frontend/src/components/CommentContent.tsx b/frontend/src/components/CommentContent.tsx
index a6e0681..185daa3 100644
--- a/frontend/src/components/CommentContent.tsx
+++ b/frontend/src/components/CommentContent.tsx
@@ -1,17 +1,53 @@
+import { useNavigate } from 'react-router-dom';
+import { api } from '../api/client';
 import { highlightMentions } from '../utils/content';
+import { userPath } from '../utils/userPath';
 
 interface Props {
   content: string;
-  onMentionClick?: (name: string) => void;
 }
 
-/** 渲染评论正文（支持正文内 @ 高亮） */
-export default function CommentContent({ content, onMentionClick }: Props) {
+/** 渲染评论正文（支持正文内 @ 高亮与点击跳转） */
+export default function CommentContent({ content }: Props) {
+  const nav = useNavigate();
+
+  const openMention = async (name: string) => {
+    try {
+      const r = await api.searchUsers(name, 5);
+      const exact = (r.users || []).find(
+        (u) => u.username === name || u.nickname === name,
+      );
+      const user = exact || r.users?.[0];
+      if (user) {
+        nav(userPath(user.id));
+      }
+    } catch {
+      // 未登录或失败时忽略
+    }
+  };
+
   return (
     <div
       className="floor-body"
+      onClick={(e) => {
+        const el = (e.target as HTMLElement).closest('.mention') as HTMLElement | null;
+        if (!el) return;
+        const name = el.getAttribute('data-name');
+        if (!name) return;
+        e.preventDefault();
+        void openMention(name);
+      }}
+      onKeyDown={(e) => {
+        if (e.key !== 'Enter' && e.key !== ' ') return;
+        const el = e.target as HTMLElement;
+        if (!el.classList.contains('mention')) return;
+        const name = el.getAttribute('data-name');
+        if (!name) return;
+        e.preventDefault();
+        void openMention(name);
+      }}
       dangerouslySetInnerHTML={{
-        __html: highlightMentions(content, onMentionClick),
+        __html: highlightMentions(content),
       }}
     />
   );
diff --git a/frontend/src/components/FeedHeader.tsx b/frontend/src/components/FeedHeader.tsx
index 1df4276..fbbed12 100644
--- a/frontend/src/components/FeedHeader.tsx
+++ b/frontend/src/components/FeedHeader.tsx
@@ -6,6 +6,8 @@ interface Props {
   boardId: number;
   keyword: string;
   tag?: string;
+  author?: string;
+  titleOnly?: boolean;
   boards: Board[];
   stats: ForumStats | null;
   postTotal: number;
@@ -13,14 +15,32 @@ interface Props {
   titleAs?: 'h1' | 'h2';
 }
 
-export default function FeedHeader({ boardId, keyword, tag = '', boards, stats, postTotal, titleAs = 'h1' }: Props) {
+export default function FeedHeader({
+  boardId,
+  keyword,
+  tag = '',
+  author = '',
+  titleOnly = false,
+  boards,
+  stats,
+  postTotal,
+  titleAs = 'h1',
+}: Props) {
   const nav = useNavigate();
   const board = boards.find(b => b.id === boardId);
 
-  const filtered = !!(keyword || tag);
+  const filtered = !!(keyword || tag || author);
   const inBoard = !filtered && boardId > 0 && !!board;
   /** 侧栏已有「全部帖子 / 板块名」，中间栏不再重复；仅搜索/标签保留标题 */
-  const title = tag ? `标签：${tag}` : (keyword ? `搜索：${keyword}` : '');
+  let title = '';
+  if (tag) title = `标签：${tag}`;
+  else if (keyword || author) {
+    const parts: string[] = [];
+    if (keyword) parts.push(titleOnly ? `标题含「${keyword}」` : `搜索：${keyword}`);
+    if (author) parts.push(`作者 ${author}`);
+    if (boardId && board) parts.push(`板块 ${board.name}`);
+    title = parts.join(' · ');
+  }
   const TitleTag = titleAs;
 
   return (
diff --git a/frontend/src/components/FeedSortBar.tsx b/frontend/src/components/FeedSortBar.tsx
index 6504654..340d2db 100644
--- a/frontend/src/components/FeedSortBar.tsx
+++ b/frontend/src/components/FeedSortBar.tsx
@@ -30,15 +30,22 @@ export function parseFeedSort(raw: string | null): FeedSort {
 export function buildHomeUrl(
   boardId: number,
   sort: FeedSort = 'latest',
-  opts?: { keyword?: string; tag?: string },
+  opts?: { keyword?: string; tag?: string; author?: string; titleOnly?: boolean },
 ) {
   const p = new URLSearchParams();
   if (boardId) p.set('board', String(boardId));
   const tag = opts?.tag?.trim();
   const keyword = opts?.keyword?.trim();
+  const author = opts?.author?.trim();
   // 标签筛选与关键词搜索互斥：有 tag 时不带 keyword
   if (tag) p.set('tag', tag);
-  else if (keyword) p.set('keyword', keyword);
+  else if (keyword) {
+    p.set('keyword', keyword);
+    if (opts?.titleOnly) p.set('title_only', '1');
+    if (author) p.set('author', author);
+  } else if (author) {
+    p.set('author', author);
+  }
   if (sort !== 'latest') p.set('sort', sort);
   const qs = p.toString();
   return qs ? `/?${qs}` : '/';
diff --git a/frontend/src/components/RightPanel.tsx b/frontend/src/components/RightPanel.tsx
index 503931c..7f85f16 100644
--- a/frontend/src/components/RightPanel.tsx
+++ b/frontend/src/components/RightPanel.tsx
@@ -1,10 +1,10 @@
-import { Flame, ListTree, MessageCircle, Tags, Sparkles } from 'lucide-react';
+import { ListTree, MessageCircle, MessagesSquare, Tags, Sparkles } from 'lucide-react';
 import { useLocation, useSearchParams } from 'react-router-dom';
 import { Skeleton } from '@/components/ui/skeleton';
 import type { PostItem, RecentComment, TagCount, User } from '../api/types';
 import type { PostHeading } from '../utils/postHeadings';
 import { useSiteBranding } from '../hooks/useSiteBranding';
-import { formatShortDateTime } from '../utils/content';
+import { formatShortDateTime, formatTime } from '../utils/content';
 import TagCloud from './TagCloud';
 import UserLink from './UserLink';
 import ArticleOutline from './ArticleOutline';
@@ -31,20 +31,13 @@ interface Props {
   postDetail?: PostDetailAside | null;
 }
 
-function hotRankClass(index: number): string {
-  if (index === 0) return 'widget-rank widget-rank--1';
-  if (index === 1) return 'widget-rank widget-rank--2';
-  if (index === 2) return 'widget-rank widget-rank--3';
-  return 'widget-rank';
-}
-
-function HotSkeleton() {
+function ActiveSkeleton() {
   return (
-    <div className="widget-skeleton" aria-busy="true" aria-label="热门加载中">
+    <div className="widget-skeleton" aria-busy="true" aria-label="正在聊加载中">
       {Array.from({ length: 6 }, (_, i) => (
-        <div key={i} className="widget-item widget-item--skeleton">
-          <Skeleton className="skeleton--widget-rank" />
+        <div key={i} className="widget-item widget-item--active widget-item--skeleton">
           <Skeleton className="skeleton--widget-title" style={{ width: `${62 + (i % 4) * 8}%` }} />
+          <Skeleton className="skeleton--widget-time" />
         </div>
       ))}
     </div>
@@ -84,14 +77,15 @@ export default function RightPanel({
   const isSiteHome = loc.pathname === '/'
     && !params.get('board')
     && !params.get('keyword')
-    && !params.get('tag');
+    && !params.get('tag')
+    && !params.get('author');
   const description = branding.description?.trim() || '';
   const slogan = branding.slogan?.trim() || '';
   // 有独立简介时展示简介；否则用欢迎语，避免与页脚 slogan 三连重复
   const aboutText = description || '欢迎参与讨论，发帖、评论，一起把小圈子聊热。';
-  // 帖子很少时热门几乎等于主列表，改显示欢迎引导
-  const showHot = loading || hotList.length >= 4;
-  const showWelcome = !loading && hotList.length > 0 && hotList.length < 4;
+  // 有近期讨论则展示「正在聊」；否则显示欢迎引导
+  const showActive = loading || hotList.length > 0;
+  const showWelcome = !loading && hotList.length === 0;
   const isPostDetail = !!postDetail;
 
   return (
@@ -137,28 +131,38 @@ export default function RightPanel({
         </div>
       )}
 
-      {!isPostDetail && showHot && (
+      {!isPostDetail && showActive && (
         <div className="widget-card">
           <div className="widget-card-head">
-            <Flame className="widget-card-icon widget-card-icon--hot" aria-hidden />
-            热门帖子
+            <MessagesSquare className="widget-card-icon widget-card-icon--hot" aria-hidden />
+            正在聊
           </div>
           <div className="widget-card-body">
             {loading && hotList.length === 0 ? (
-              <HotSkeleton />
+              <ActiveSkeleton />
             ) : hotList.length === 0 ? (
-              <div className="widget-empty">暂无数据</div>
-            ) : hotList.map((item, i) => (
-              <button
-                key={item.id}
-                type="button"
-                className="widget-item"
-                onClick={() => onPostClick(item.id)}
-              >
-                <span className={hotRankClass(i)}>{i + 1}</span>
-                <span className="widget-item-title">{item.title}</span>
-              </button>
-            ))}
+              <div className="widget-empty">近 7 日暂无新回复</div>
+            ) : hotList.map((item) => {
+              const replyLabel = item.last_reply_at
+                ? `${formatTime(item.last_reply_at)}有人回`
+                : '近期有讨论';
+              const count = item.comment_count ?? 0;
+              return (
+                <button
+                  key={item.id}
+                  type="button"
+                  className="widget-item widget-item--active"
+                  onClick={() => onPostClick(item.id)}
+                  title={item.title}
+                >
+                  <span className="widget-item-title">{item.title}</span>
+                  <span className="widget-item-meta">
+                    <span className="widget-item-time">{replyLabel}</span>
+                    {count > 0 && <span className="widget-item-count">{count} 评</span>}
+                  </span>
+                </button>
+              );
+            })}
           </div>
         </div>
       )}
diff --git a/frontend/src/layouts/MainLayout.tsx b/frontend/src/layouts/MainLayout.tsx
index 825ef4a..a8c881a 100644
--- a/frontend/src/layouts/MainLayout.tsx
+++ b/frontend/src/layouts/MainLayout.tsx
@@ -68,6 +68,10 @@ export default function MainLayout() {
   const asideEverLoaded = useRef(false);
   const [boardId, setBoardId] = useState(Number(params.get('board')) || 0);
   const [keyword, setKeyword] = useState(params.get('keyword') || '');
+  const [searchAuthor, setSearchAuthor] = useState(params.get('author') || '');
+  const [searchTitleOnly, setSearchTitleOnly] = useState(params.get('title_only') === '1');
+  const [searchInBoard, setSearchInBoard] = useState(!!params.get('board') && !!params.get('keyword'));
+  const [searchAdvanced, setSearchAdvanced] = useState(false);
   const feedSort = parseFeedSort(params.get('sort'));
   const { limits: forumLimits } = useForumLimits();
 
@@ -96,7 +100,12 @@ export default function MainLayout() {
   });
 
   useEffect(() => { setBoardId(Number(params.get('board')) || 0); }, [params]);
-  useEffect(() => { setKeyword(params.get('keyword') || ''); }, [params]);
+  useEffect(() => {
+    setKeyword(params.get('keyword') || '');
+    setSearchAuthor(params.get('author') || '');
+    setSearchTitleOnly(params.get('title_only') === '1');
+    setSearchInBoard(!!params.get('board') && (!!params.get('keyword') || !!params.get('author')));
+  }, [params]);
   useEffect(() => {
     setAsideOpen(false);
     setSidebarOpen(false);
@@ -226,24 +235,39 @@ export default function MainLayout() {
 
   const doSearch = () => {
     const kw = keyword.trim();
-    const active = (params.get('keyword') || '').trim();
-    if (!kw) {
-      // 输入已空：仅当 URL 仍带搜索时才回到全部帖子
-      if (active) navigateFeed(nav, '/');
+    const author = searchAuthor.trim();
+    const activeKw = (params.get('keyword') || '').trim();
+    const activeAuthor = (params.get('author') || '').trim();
+    const activeTitleOnly = params.get('title_only') === '1';
+    const activeBoard = Number(params.get('board')) || 0;
+    if (!kw && !author) {
+      if (activeKw || activeAuthor) navigateFeed(nav, '/');
       return;
     }
-    const len = [...kw].length;
-    if (forumLimits.search_keyword_min > 0 && len < forumLimits.search_keyword_min) {
-      notify.warning(`搜索关键词至少 ${forumLimits.search_keyword_min} 个字`);
-      return;
+    if (kw) {
+      const len = [...kw].length;
+      if (forumLimits.search_keyword_min > 0 && len < forumLimits.search_keyword_min) {
+        notify.warning(`搜索关键词至少 ${forumLimits.search_keyword_min} 个字`);
+        return;
+      }
+      if (forumLimits.search_keyword_max > 0 && len > forumLimits.search_keyword_max) {
+        notify.warning(`搜索关键词最多 ${forumLimits.search_keyword_max} 个字`);
+        return;
+      }
     }
-    if (forumLimits.search_keyword_max > 0 && len > forumLimits.search_keyword_max) {
-      notify.warning(`搜索关键词最多 ${forumLimits.search_keyword_max} 个字`);
-      return;
-    }
-    const target = `/?keyword=${encodeURIComponent(kw)}`;
-    // 相同关键词再次回车：强制刷新，避免命中错误缓存或被当成空导航
-    if (active === kw && loc.pathname === '/') {
+    const scopeBoard = searchInBoard && boardId > 0 ? boardId : 0;
+    const target = buildHomeUrl(scopeBoard, 'latest', {
+      keyword: kw,
+      author,
+      titleOnly: !!kw && searchTitleOnly,
+    });
+    const same =
+      loc.pathname === '/'
+      && activeKw === kw
+      && activeAuthor === author
+      && activeTitleOnly === (!!kw && searchTitleOnly)
+      && activeBoard === scopeBoard;
+    if (same) {
       navigateFeed(nav, target);
       return;
     }
@@ -259,9 +283,10 @@ export default function MainLayout() {
   const isFeedHome = loc.pathname === '/';
   const outletKeyword = params.get('keyword') || '';
   const outletTag = params.get('tag') || '';
+  const outletAuthor = params.get('author') || '';
   // 搜索/标签结果页不选中任何板块芯片（避免看起来仍停在「全部」）
   const mobileActiveBoard =
-    isNeutralSidebarRoute(loc.pathname) || !!outletKeyword || !!outletTag
+    isNeutralSidebarRoute(loc.pathname) || !!outletKeyword || !!outletTag || !!outletAuthor
       ? -1
       : boardId;
 
@@ -346,7 +371,7 @@ export default function MainLayout() {
 
           {!isCompose && (!isMobile || searchExpanded) && (
           <form
-            className={`header-search-wrap${isMobile && searchExpanded ? ' header-search-wrap--expanded' : ''}`}
+            className={`header-search-wrap${isMobile && searchExpanded ? ' header-search-wrap--expanded' : ''}${searchAdvanced ? ' header-search-wrap--advanced' : ''}`}
             role="search"
             onSubmit={e => {
               e.preventDefault();
@@ -354,34 +379,80 @@ export default function MainLayout() {
               if (isMobile) setSearchExpanded(false);
             }}
           >
-            <Search className="header-search-icon" size={16} aria-hidden />
-            <input
-              ref={searchInputRef}
-              className="header-search-input"
-              type="search"
-              placeholder="搜索帖子..."
-              aria-label="搜索帖子"
-              value={keyword}
-              onChange={e => setKeyword(e.target.value)}
-              maxLength={forumLimits.search_keyword_max > 0 ? forumLimits.search_keyword_max : undefined}
-              enterKeyHint="search"
-            />
-            {keyword && (
+            <div className="header-search-row">
+              <Search className="header-search-icon" size={16} aria-hidden />
+              <input
+                ref={searchInputRef}
+                className="header-search-input"
+                type="search"
+                placeholder="搜索帖子..."
+                aria-label="搜索帖子"
+                value={keyword}
+                onChange={e => setKeyword(e.target.value)}
+                maxLength={forumLimits.search_keyword_max > 0 ? forumLimits.search_keyword_max : undefined}
+                enterKeyHint="search"
+              />
               <button
                 type="button"
-                className="header-search-clear"
-                onClick={() => { setKeyword(''); navigateFeed(nav, '/'); }}
-                aria-label="清除搜索"
-              >×</button>
-            )}
-            {isMobile && searchExpanded && (
-              <button
-                type="button"
-                className="header-search-cancel"
-                onClick={() => setSearchExpanded(false)}
+                className={cn('header-search-adv-toggle', searchAdvanced && 'active')}
+                onClick={() => setSearchAdvanced((v) => !v)}
+                aria-expanded={searchAdvanced}
+                title="高级搜索"
               >
-                取消
+                筛选
               </button>
+              {(keyword || searchAuthor) && (
+                <button
+                  type="button"
+                  className="header-search-clear"
+                  onClick={() => {
+                    setKeyword('');
+                    setSearchAuthor('');
+                    setSearchTitleOnly(false);
+                    navigateFeed(nav, '/');
+                  }}
+                  aria-label="清除搜索"
+                >×</button>
+              )}
+              {isMobile && searchExpanded && (
+                <button
+                  type="button"
+                  className="header-search-cancel"
+                  onClick={() => setSearchExpanded(false)}
+                >
+                  取消
+                </button>
+              )}
+            </div>
+            {searchAdvanced && (
+              <div className="header-search-advanced">
+                <label className="header-search-opt">
+                  <input
+                    type="checkbox"
+                    checked={searchTitleOnly}
+                    onChange={(e) => setSearchTitleOnly(e.target.checked)}
+                  />
+                  仅标题
+                </label>
+                {boardId > 0 && (
+                  <label className="header-search-opt">
+                    <input
+                      type="checkbox"
+                      checked={searchInBoard}
+                      onChange={(e) => setSearchInBoard(e.target.checked)}
+                    />
+                    当前板块
+                  </label>
+                )}
+                <input
+                  className="header-search-author"
+                  type="text"
+                  placeholder="作者用户名/昵称"
+                  aria-label="作者"
+                  value={searchAuthor}
+                  onChange={(e) => setSearchAuthor(e.target.value)}
+                />
+              </div>
             )}
           </form>
           )}
diff --git a/frontend/src/pages/ForgotPasswordPage.tsx b/frontend/src/pages/ForgotPasswordPage.tsx
new file mode 100644
index 0000000..d49e0d8
--- /dev/null
+++ b/frontend/src/pages/ForgotPasswordPage.tsx
@@ -0,0 +1,182 @@
+import { useEffect, useState } from 'react';
+import { useNavigate, Link } from 'react-router-dom';
+import { useForm } from 'react-hook-form';
+import { zodResolver } from '@hookform/resolvers/zod';
+import { z } from 'zod';
+import { ArrowLeft } from 'lucide-react';
+import { Button } from '@/components/ui/button';
+import { Input } from '@/components/ui/input';
+import { Form, FormControl, FormField, FormItem, FormLabel, FormMessage } from '@/components/ui/form';
+import AuthPasswordInput from '@/components/AuthPasswordInput';
+import { notify } from '@/lib/notify';
+import { api } from '../api/client';
+import { useForumLimits } from '../hooks/useForumLimits';
+import { loginPath } from '../utils/authRedirect';
+import { useSiteBranding } from '../hooks/useSiteBranding';
+import { useNoIndexSEO } from '../hooks/usePageSEO';
+import SiteBrandMark from '../components/SiteBrandMark';
+
+const schema = (minLen: number, codeLen: number) => z.object({
+  email: z.string().min(1, '请输入邮箱').email('请输入有效邮箱'),
+  email_code: z.string().regex(new RegExp(`^\\d{${codeLen}}$`), `请输入 ${codeLen} 位数字验证码`),
+  new_password: z.string().min(minLen, `密码至少 ${minLen} 位`),
+});
+
+type FormValues = z.infer<ReturnType<typeof schema>>;
+
+export default function ForgotPasswordPage() {
+  const { limits } = useForumLimits();
+  const { branding } = useSiteBranding();
+  useNoIndexSEO('找回密码');
+  const nav = useNavigate();
+  const [loading, setLoading] = useState(false);
+  const [sendingCode, setSendingCode] = useState(false);
+  const [countdown, setCountdown] = useState(0);
+  const [mailReady, setMailReady] = useState<boolean | null>(null);
+  const codeLen = 6;
+
+  const form = useForm<FormValues>({
+    resolver: zodResolver(schema(limits.password_min_len, codeLen)),
+    defaultValues: { email: '', email_code: '', new_password: '' },
+  });
+
+  useEffect(() => {
+    api.registerConfig()
+      .then((c) => setMailReady(!!c.mail_ready))
+      .catch(() => setMailReady(false));
+  }, []);
+
+  useEffect(() => {
+    if (countdown <= 0) return;
+    const t = window.setTimeout(() => setCountdown((c) => c - 1), 1000);
+    return () => window.clearTimeout(t);
+  }, [countdown]);
+
+  const sendCode = async () => {
+    const email = form.getValues('email');
+    const parsed = z.string().email().safeParse(email);
+    if (!parsed.success) {
+      form.setError('email', { message: '请先填写有效邮箱' });
+      return;
+    }
+    setSendingCode(true);
+    try {
+      const r = await api.sendResetEmailCode(email);
+      notify.success(r.message);
+      setCountdown(60);
+    } catch (e: unknown) {
+      notify.error(e instanceof Error ? e.message : '发送失败');
+    } finally {
+      setSendingCode(false);
+    }
+  };
+
+  const onSubmit = async (values: FormValues) => {
+    setLoading(true);
+    try {
+      const r = await api.resetPassword({
+        email: values.email,
+        emailCode: values.email_code,
+        newPassword: values.new_password,
+      });
+      notify.success(r.message);
+      nav(loginPath());
+    } catch (e: unknown) {
+      notify.error(e instanceof Error ? e.message : '重置失败');
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  return (
+    <div className="auth-page">
+      <div className="auth-box">
+        <Link to="/" className="auth-brand-link" aria-label={`返回${branding.name}`}>
+          <SiteBrandMark branding={branding} className="logo-mark" />
+        </Link>
+        <h1>找回密码</h1>
+        <p className="subtitle">
+          {mailReady === false
+            ? '邮件服务未配置，请联系站长重置密码'
+            : '通过注册邮箱验证码设置新密码'}
+        </p>
+        <Form {...form}>
+          <form onSubmit={form.handleSubmit(onSubmit)} className="space-y-4">
+            <FormField
+              control={form.control}
+              name="email"
+              render={({ field }) => (
+                <FormItem>
+                  <FormLabel>注册邮箱</FormLabel>
+                  <FormControl>
+                    <Input type="email" placeholder="you@example.com" autoComplete="email" {...field} />
+                  </FormControl>
+                  <FormMessage />
+                </FormItem>
+              )}
+            />
+            <FormField
+              control={form.control}
+              name="email_code"
+              render={({ field }) => (
+                <FormItem>
+                  <FormLabel>邮箱验证码</FormLabel>
+                  <div className="auth-captcha-row">
+                    <FormControl>
+                      <Input
+                        placeholder={`${codeLen} 位数字`}
+                        inputMode="numeric"
+                        autoComplete="one-time-code"
+                        maxLength={codeLen}
+                        className="auth-email-code-input"
+                        {...field}
+                        onChange={(e) => {
+                          const digits = e.target.value.replace(/\D/g, '').slice(0, codeLen);
+                          field.onChange(digits);
+                        }}
+                      />
+                    </FormControl>
+                    <Button
+                      type="button"
+                      variant="outline"
+                      className="auth-code-btn"
+                      loading={sendingCode}
+                      disabled={countdown > 0 || mailReady === false}
+                      onClick={() => void sendCode()}
+                    >
+                      {countdown > 0 ? `${countdown}s` : '获取验证码'}
+                    </Button>
+                  </div>
+                  <FormMessage />
+                </FormItem>
+              )}
+            />
+            <FormField
+              control={form.control}
+              name="new_password"
+              render={({ field }) => (
+                <FormItem>
+                  <FormLabel>新密码</FormLabel>
+                  <FormControl>
+                    <AuthPasswordInput placeholder="新密码" autoComplete="new-password" {...field} />
+                  </FormControl>
+                  <FormMessage />
+                </FormItem>
+              )}
+            />
+            <Button type="submit" className="w-full" loading={loading} disabled={mailReady === false}>
+              重置密码
+            </Button>
+          </form>
+        </Form>
+        <p className="auth-footer">
+          想起密码了？<Link to={loginPath()}>返回登录</Link>
+        </p>
+        <Link to="/" className="auth-back">
+          <ArrowLeft size={16} aria-hidden />
+          返回论坛
+        </Link>
+      </div>
+    </div>
+  );
+}
diff --git a/frontend/src/pages/HomePage.tsx b/frontend/src/pages/HomePage.tsx
index d8d5492..ce93a82 100644
--- a/frontend/src/pages/HomePage.tsx
+++ b/frontend/src/pages/HomePage.tsx
@@ -33,14 +33,16 @@ export default function HomePage() {
   const boardId = Number(params.get('board')) || ctx?.boardId || 0;
   const keyword = params.get('keyword') || '';
   const tag = params.get('tag') || '';
+  const author = params.get('author') || '';
+  const titleOnly = params.get('title_only') === '1';
   const sort = parseFeedSort(params.get('sort'));
   const board = (ctx?.boards ?? []).find(b => b.id === boardId);
-  const isSiteHome = !boardId && !keyword && !tag;
+  const isSiteHome = !boardId && !keyword && !tag && !author;
   const siteIntro = siteMetaDescription(branding);
   const feedTitle = tag
     ? `标签：${tag}`
-    : keyword
-      ? `搜索：${keyword}`
+    : keyword || author
+      ? `搜索：${keyword || ''}${author ? (keyword ? ` · 作者 ${author}` : `作者 ${author}`) : ''}${titleOnly ? '（仅标题）' : ''}`
       : (boardId && board ? board.name : '');
   usePageSEO({
     title: feedTitle || undefined,
@@ -67,7 +69,7 @@ export default function HomePage() {
   const pageRef = useRef(1);
   pageRef.current = page;
   // 与当前筛选一致的列表快照（供卸载/切换筛选时写入缓存）
-  const feedSnapRef = useRef({ boardId, keyword, tag, sort, posts, postTotal, page });
+  const feedSnapRef = useRef({ boardId, keyword, tag, author, titleOnly, sort, posts, postTotal, page });
 
   const totalPages = Math.max(1, Math.ceil(Math.max(postTotal, 0) / pageSize));
   const showPagination = totalPages > 1 && posts.length > 0;
@@ -96,6 +98,8 @@ export default function HomePage() {
         board_id: boardId || '',
         keyword: tag ? '' : keyword,
         tag: tag || '',
+        author: tag ? '' : author,
+        title_only: !tag && titleOnly ? '1' : '',
         sort: sort === 'latest' ? '' : sort,
       });
       const batch = Array.isArray(data.posts) ? data.posts : [];
@@ -114,7 +118,7 @@ export default function HomePage() {
       loadingRef.current = false;
       setLoading(false);
     }
-  }, [boardId, keyword, tag, sort, pageSize]);
+  }, [boardId, keyword, tag, author, titleOnly, sort, pageSize]);
 
   const loadFirst = useCallback(() => fetchPage(1), [fetchPage]);
 
@@ -142,7 +146,7 @@ export default function HomePage() {
       return;
     }
 
-    const cached = getFeedCache(boardId, keyword, sort, tag);
+    const cached = getFeedCache(boardId, keyword, sort, tag, author, titleOnly);
     if (cached && cached.posts.length > 0) {
       setPosts(cached.posts);
       setPostTotal(cached.postTotal);
@@ -163,6 +167,8 @@ export default function HomePage() {
     boardId,
     keyword,
     tag,
+    author,
+    titleOnly,
     sort,
     location.key,
     location.state,
@@ -175,15 +181,17 @@ export default function HomePage() {
     feedSnapRef.current.boardId === boardId
     && feedSnapRef.current.keyword === keyword
     && feedSnapRef.current.tag === tag
+    && feedSnapRef.current.author === author
+    && feedSnapRef.current.titleOnly === titleOnly
     && feedSnapRef.current.sort === sort
   ) {
-    feedSnapRef.current = { boardId, keyword, tag, sort, posts, postTotal, page };
+    feedSnapRef.current = { boardId, keyword, tag, author, titleOnly, sort, posts, postTotal, page };
   }
 
   // 仅在筛选变化 / 卸载时缓存；勿把 posts 放进 deps（否则会用旧列表污染新 keyword）
   useEffect(() => {
     // cleanup 先保存上一档；再把快照重置为当前筛选的空占位
-    feedSnapRef.current = { boardId, keyword, tag, sort, posts: [], postTotal: 0, page: 1 };
+    feedSnapRef.current = { boardId, keyword, tag, author, titleOnly, sort, posts: [], postTotal: 0, page: 1 };
     return () => {
       if (skipCacheSaveRef.current) return;
       const snap = feedSnapRef.current;
@@ -193,9 +201,9 @@ export default function HomePage() {
         postTotal: snap.postTotal,
         page: snap.page,
         scrollTop: scrollTopRef.current,
-      }, snap.tag);
+      }, snap.tag, snap.author, snap.titleOnly);
     };
-  }, [boardId, keyword, tag, sort]);
+  }, [boardId, keyword, tag, author, titleOnly, sort]);
 
   useEffect(() => {
     if (!loading && posts.length > 0) skipCacheSaveRef.current = false;
@@ -222,10 +230,10 @@ export default function HomePage() {
       loadFirst();
       return;
     }
-    navigateFeed(nav, buildHomeUrl(boardId, next, { keyword, tag }));
+    navigateFeed(nav, buildHomeUrl(boardId, next, { keyword, tag, author, titleOnly }));
   };
 
-  const showSortBar = !keyword && !tag;
+  const showSortBar = !keyword && !tag && !author;
 
   // 首屏用同构骨架，避免标题/列表分区先后出现造成闪动
   if ((loading || limitsLoading) && posts.length === 0) {
@@ -241,6 +249,8 @@ export default function HomePage() {
               boardId={boardId}
               keyword={keyword}
               tag={tag}
+              author={author}
+              titleOnly={titleOnly}
               boards={ctx?.boards ?? []}
               stats={ctx?.stats ?? null}
               postTotal={postTotal}
@@ -266,7 +276,7 @@ export default function HomePage() {
           resetScrollKey={listResetKey}
           onScrollTopChange={(top) => { scrollTopRef.current = top; }}
           onScrollRestored={() => setRestoreScrollTop(null)}
-          keyword={keyword || tag}
+          keyword={keyword || tag || author}
           boardId={boardId}
           boardName={ctx?.boards?.find(b => b.id === boardId)?.name || ''}
           noBoards={!ctx?.boardsLoading && (ctx?.boards?.length ?? 0) === 0}
diff --git a/frontend/src/pages/LoginPage.tsx b/frontend/src/pages/LoginPage.tsx
index 5ae3f7d..fe3776c 100644
--- a/frontend/src/pages/LoginPage.tsx
+++ b/frontend/src/pages/LoginPage.tsx
@@ -92,6 +92,8 @@ export default function LoginPage() {
           </form>
         </Form>
         <p className="auth-footer">
+          <Link to="/forgot-password">忘记密码</Link>
+          <span className="auth-footer-sep" aria-hidden>·</span>
           没有账号？<Link to={registerPath(redirectTo === '/' ? undefined : redirectTo)}>注册</Link>
         </p>
         <Link to="/" className="auth-back">
diff --git a/frontend/src/pages/MessagesPage.tsx b/frontend/src/pages/MessagesPage.tsx
index 8bb944d..32bb46a 100644
--- a/frontend/src/pages/MessagesPage.tsx
+++ b/frontend/src/pages/MessagesPage.tsx
@@ -20,6 +20,7 @@ type MsgTab = 'dm' | 'notify';
 const NOTIFY_KINDS = [
   { key: 'all', label: '全部' },
   { key: 'reply', label: '回复' },
+  { key: 'mention', label: '@提及' },
   { key: 'moderation', label: '待审' },
   { key: 'reject', label: '拒帖' },
   { key: 'report_result', label: '举报' },
@@ -31,6 +32,7 @@ function kindLabel(kind: string) {
     case 'reject': return '拒帖通知';
     case 'report_result': return '举报结果';
     case 'reply': return '回复提醒';
+    case 'mention': return '@提及';
     case 'moderation': return '待审提醒';
     case 'system': return '系统通知';
     default: return '通知';
diff --git a/frontend/src/styles/global.css b/frontend/src/styles/global.css
index 0f9ec81..1ab7e22 100644
--- a/frontend/src/styles/global.css
+++ b/frontend/src/styles/global.css
@@ -380,14 +380,80 @@ img.site-brand-logo-img {
   min-width: 0;
   max-width: 420px;
   display: flex;
-  align-items: center;
-  gap: 8px;
-  height: 36px;
-  padding: 0 14px;
+  flex-direction: column;
+  justify-content: center;
+  gap: 0;
+  min-height: 36px;
+  padding: 0 10px 0 14px;
   border-radius: 999px;
   background: var(--j13-bg-block-muted);
   border: 1px solid var(--j13-border-light);
-  transition: border-color 0.2s, background 0.2s, box-shadow 0.2s;
+  transition: border-color 0.2s, background 0.2s, box-shadow 0.2s, border-radius 0.15s;
+}
+
+.header-search-wrap--advanced {
+  border-radius: 14px;
+  padding-bottom: 8px;
+  max-width: 480px;
+}
+
+.header-search-row {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  width: 100%;
+  min-height: 36px;
+}
+
+.header-search-advanced {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: 8px 12px;
+  padding: 0 2px 2px 24px;
+}
+
+.header-search-opt {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.3rem;
+  font-size: 0.75rem;
+  color: var(--color-text-3, #64748b);
+  cursor: pointer;
+  white-space: nowrap;
+}
+
+.header-search-opt input {
+  margin: 0;
+}
+
+.header-search-author {
+  flex: 1;
+  min-width: 7rem;
+  height: 28px;
+  padding: 0 0.55rem;
+  border: 1px solid var(--j13-border-light);
+  border-radius: 0.35rem;
+  background: var(--j13-bg-surface, #fff);
+  font-size: 0.78rem;
+  color: var(--color-text-1);
+  font-family: inherit;
+}
+
+.header-search-adv-toggle {
+  flex-shrink: 0;
+  border: none;
+  background: transparent;
+  color: var(--color-text-3);
+  font-size: 0.75rem;
+  font-family: inherit;
+  padding: 0 2px;
+  cursor: pointer;
+}
+
+.header-search-adv-toggle.active,
+.header-search-adv-toggle:hover {
+  color: var(--j13-green);
 }
 
 .header-search-wrap:focus-within {
@@ -3102,6 +3168,11 @@ a.post-title:visited {
   color: var(--color-text-3);
 }
 
+.auth-footer-sep {
+  margin: 0 0.4rem;
+  color: var(--color-text-4, #94a3b8);
+}
+
 .post-detail-loading {
   display: flex;
   align-items: center;
@@ -5116,6 +5187,84 @@ a.post-title:visited {
   transition: border-color 0.2s, background 0.2s;
 }
 
+.comment-mention-popup {
+  position: absolute;
+  left: 8px;
+  right: 48px;
+  bottom: calc(100% + 4px);
+  z-index: 20;
+  max-height: 220px;
+  overflow-y: auto;
+  border: 1px solid var(--j13-border, #e2e8f0);
+  border-radius: 0.45rem;
+  background: var(--j13-card, #fff);
+  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.1);
+}
+
+.comment-mention-item {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  width: 100%;
+  padding: 0.45rem 0.65rem;
+  border: 0;
+  background: transparent;
+  text-align: left;
+  cursor: pointer;
+  color: inherit;
+  font: inherit;
+}
+
+.comment-mention-item:hover,
+.comment-mention-item.active {
+  background: color-mix(in srgb, var(--j13-green, #18a058) 10%, transparent);
+}
+
+.comment-mention-avatar {
+  width: 1.5rem;
+  height: 1.5rem;
+  border-radius: 999px;
+  overflow: hidden;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  background: var(--j13-bg-block-muted, #f1f5f9);
+  font-size: 0.7rem;
+  flex-shrink: 0;
+}
+
+.comment-mention-avatar img {
+  width: 100%;
+  height: 100%;
+  object-fit: cover;
+}
+
+.comment-mention-meta {
+  display: flex;
+  flex-direction: column;
+  min-width: 0;
+  line-height: 1.25;
+}
+
+.comment-mention-nick {
+  font-size: 0.85rem;
+  font-weight: 560;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.comment-mention-user {
+  font-size: 0.72rem;
+  color: var(--color-text-4, #94a3b8);
+}
+
+.comment-mention-empty {
+  padding: 0.65rem;
+  font-size: 0.8rem;
+  color: var(--color-text-3, #64748b);
+}
+
 .comment-box-input-wrap:focus-within {
   border-color: rgb(var(--primary-6));
 }
@@ -5591,7 +5740,14 @@ a.waline-comment-author:hover {
   .waline-comment { padding: 12px 14px; }
 }
 
-.mention { color: var(--j13-green); font-weight: 400; }
+.mention {
+  color: var(--j13-green);
+  font-weight: 500;
+  cursor: pointer;
+}
+.mention:hover {
+  text-decoration: underline;
+}
 
 .quote-block {
   border-left: 3px solid var(--j13-green);
@@ -6205,17 +6361,68 @@ a.user-link--avatar-only:focus-visible {
   font-weight: 400;
 }
 
-.widget-item--comment {
-  cursor: default;
+.widget-item--active {
+  flex-direction: column;
+  align-items: stretch;
+  gap: 0.2rem;
+  padding: 0.5rem 0.65rem;
+  border-radius: 6px;
+  box-sizing: border-box;
+  min-width: 0;
+  overflow: hidden;
 }
 
-/* 取消左右 padding 位移，避免悬停时日期被挤向前 */
+/* 正在聊：保留悬停底色与内边距，取消左右位移与变色 */
+.widget-item.widget-item--active:hover,
+.widget-item.widget-item--active:focus-visible {
+  color: inherit;
+  padding-left: 0.65rem;
+  padding-right: 0.65rem;
+  margin-left: 0;
+  margin-right: 0;
+  background: var(--j13-bg-block-accent);
+}
+
+/* 标题单行省略，避免多行撑高区块 */
+.widget-item--active .widget-item-title {
+  flex: none;
+  display: block;
+  max-width: 100%;
+  min-width: 0;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+  line-height: 1.35;
+}
+
+.widget-item-meta {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 0.5rem;
+  font-size: 0.72rem;
+  color: var(--color-text-4, #94a3b8);
+}
+
+.widget-item-count {
+  flex-shrink: 0;
+}
+
+.widget-item--comment {
+  cursor: default;
+  padding-left: 0.65rem;
+  padding-right: 0.65rem;
+  border-radius: 6px;
+  box-sizing: border-box;
+}
+
+/* 最新评论：保留悬停底色与内边距，取消左右位移 */
 .widget-item.widget-item--comment:hover,
 .widget-item.widget-item--comment:focus-visible,
 .widget-item.widget-item--comment:focus-within {
   color: inherit;
-  padding-left: 0;
-  padding-right: 0;
+  padding-left: 0.65rem;
+  padding-right: 0.65rem;
   margin-left: 0;
   margin-right: 0;
   background: var(--j13-bg-block-accent);
diff --git a/frontend/src/utils/content.ts b/frontend/src/utils/content.ts
index 6344393..cb821b3 100644
--- a/frontend/src/utils/content.ts
+++ b/frontend/src/utils/content.ts
@@ -9,10 +9,13 @@ function escapeWithBreaks(text: string): string {
     .replace(/\n/g, '<br>');
 }
 
-/** @用户名 高亮（仅用于评论正文中用户主动输入的 @） */
-export function highlightMentions(text: string, _onClick?: (name: string) => void): string {
+/** @用户名 高亮（data-name 供点击跳转用户主页） */
+export function highlightMentions(text: string): string {
   return escapeWithBreaks(text)
-    .replace(/@([\w\u4e00-\u9fa5_-]+)/g, '<span class="mention">@$1</span>');
+    .replace(
+      /@([\w\u4e00-\u9fa5_-]+)/g,
+      '<span class="mention" data-name="$1" role="link" tabindex="0">@$1</span>',
+    );
 }
 
 /** 相对时间：刚刚 / N分钟前 / N小时前 / N天前；更早用具体日期 */
diff --git a/frontend/src/utils/feedCache.ts b/frontend/src/utils/feedCache.ts
index 2b1962e..12ef832 100644
--- a/frontend/src/utils/feedCache.ts
+++ b/frontend/src/utils/feedCache.ts
@@ -15,18 +15,40 @@ export type FeedCache = {
 /** 仅存内存：SPA 内返回可恢复，浏览器刷新自动清空 */
 const store = new Map<string, FeedCache>();
 
-function cacheKey(boardId: number, keyword: string, sort: FeedSort, tag = '') {
-  return `${boardId}:${keyword}:${tag}:${sort}`;
+function cacheKey(
+  boardId: number,
+  keyword: string,
+  sort: FeedSort,
+  tag = '',
+  author = '',
+  titleOnly = false,
+) {
+  return `${boardId}:${keyword}:${tag}:${author}:${titleOnly ? 1 : 0}:${sort}`;
 }
 
 /** 读取帖子列表缓存（从详情页返回时恢复浏览位置） */
-export function getFeedCache(boardId: number, keyword: string, sort: FeedSort, tag = ''): FeedCache | null {
-  return store.get(cacheKey(boardId, keyword, sort, tag)) ?? null;
+export function getFeedCache(
+  boardId: number,
+  keyword: string,
+  sort: FeedSort,
+  tag = '',
+  author = '',
+  titleOnly = false,
+): FeedCache | null {
+  return store.get(cacheKey(boardId, keyword, sort, tag, author, titleOnly)) ?? null;
 }
 
 /** 保存帖子列表缓存 */
-export function setFeedCache(boardId: number, keyword: string, sort: FeedSort, data: FeedCache, tag = '') {
-  store.set(cacheKey(boardId, keyword, sort, tag), data);
+export function setFeedCache(
+  boardId: number,
+  keyword: string,
+  sort: FeedSort,
+  data: FeedCache,
+  tag = '',
+  author = '',
+  titleOnly = false,
+) {
+  store.set(cacheKey(boardId, keyword, sort, tag, author, titleOnly), data);
 }
 
 /** 清除所有帖子列表缓存 */
diff --git a/handler/api.go b/handler/api.go
index 8b4c55c..420f790 100644
--- a/handler/api.go
+++ b/handler/api.go
@@ -364,6 +364,7 @@ func (h *Handlers) APIAdminApproveComment(c *gin.Context) {
 		if comment, err := h.Comment.GetByID(uint(id)); err == nil {
 			comment.Status = model.ContentStatusPublished
 			h.Notify.AsyncNotifyCommentPublished(comment)
+			h.Notify.AsyncNotifyCommentMentions(comment)
 		}
 	}
 	c.JSON(http.StatusOK, gin.H{"message": "评论已通过审核", "status": model.ContentStatusPublished})
@@ -933,6 +934,8 @@ func (h *Handlers) APIPosts(c *gin.Context) {
 	userID, _ := strconv.ParseUint(c.Query("user_id"), 10, 64)
 	keyword := c.Query("keyword")
 	tag := strings.TrimSpace(c.Query("tag"))
+	author := strings.TrimSpace(c.Query("author"))
+	titleOnly := c.Query("title_only") == "1" || strings.EqualFold(c.Query("title_only"), "true")
 
 	q := service.PostListQuery{
 		BoardID:       uint(boardID),
@@ -941,6 +944,8 @@ func (h *Handlers) APIPosts(c *gin.Context) {
 		Size:          size,
 		Keyword:       keyword,
 		Tag:           tag,
+		Author:        author,
+		TitleOnly:     titleOnly,
 		Sort:          c.DefaultQuery("sort", "latest"),
 		ViewerID:      h.currentUserID(c),
 		ViewerIsAdmin: h.isAdmin(c),
@@ -1063,7 +1068,7 @@ func (h *Handlers) APIPostComments(c *gin.Context) {
 	c.JSON(http.StatusOK, gin.H{"comments": comments, "total": len(comments)})
 }
 
-// APIHotPosts 热门 TOP
+// APIHotPosts 近期活跃讨论（近 7 日有回复）
 func (h *Handlers) APIHotPosts(c *gin.Context) {
 	items, err := h.Post.HotPosts(10)
 	if err != nil {
diff --git a/handler/handlers.go b/handler/handlers.go
index a60bb1c..aa4b3d8 100644
--- a/handler/handlers.go
+++ b/handler/handlers.go
@@ -155,6 +155,77 @@ func (h *Handlers) APISendRegisterEmailCode(c *gin.Context) {
 	c.JSON(http.StatusOK, gin.H{"message": "验证码已发送"})
 }
 
+// APISendResetEmailCode 发送重置密码验证码
+func (h *Handlers) APISendResetEmailCode(c *gin.Context) {
+	var req struct {
+		Email string `json:"email" form:"email" binding:"required"`
+	}
+	if err := c.ShouldBind(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "参数错误"})
+		return
+	}
+	if !h.Settings.MailReady() {
+		c.JSON(http.StatusBadRequest, gin.H{"error": service.ErrMailNotConfigured.Error()})
+		return
+	}
+	if err := h.EmailCode.SendResetCode(req.Email); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"message": "若该邮箱已注册，验证码将发送到邮箱"})
+}
+
+// APIResetPassword 邮箱验证码重置密码
+func (h *Handlers) APIResetPassword(c *gin.Context) {
+	var req struct {
+		Email       string `json:"email" form:"email" binding:"required"`
+		EmailCode   string `json:"email_code" form:"email_code" binding:"required"`
+		NewPassword string `json:"new_password" form:"new_password" binding:"required"`
+	}
+	if err := c.ShouldBind(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "参数错误"})
+		return
+	}
+	if !h.Settings.MailReady() {
+		c.JSON(http.StatusBadRequest, gin.H{"error": service.ErrMailNotConfigured.Error()})
+		return
+	}
+	if !h.EmailCode.VerifyPurpose(service.EmailCodePurposeReset, req.Email, req.EmailCode) {
+		c.JSON(http.StatusBadRequest, gin.H{"error": service.ErrEmailCodeInvalid.Error()})
+		return
+	}
+	if err := h.User.ResetPasswordByEmail(req.Email, req.NewPassword); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"message": "密码已重置，请使用新密码登录"})
+}
+
+// APISearchUsers 用户搜索（@补全）
+func (h *Handlers) APISearchUsers(c *gin.Context) {
+	q := strings.TrimSpace(c.Query("q"))
+	if q == "" {
+		c.JSON(http.StatusOK, gin.H{"users": []any{}})
+		return
+	}
+	limit, _ := strconv.Atoi(c.DefaultQuery("limit", "8"))
+	users, err := h.User.SearchUsersBrief(q, limit)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+	out := make([]gin.H, 0, len(users))
+	for _, u := range users {
+		out = append(out, gin.H{
+			"id":       u.ID,
+			"username": u.Username,
+			"nickname": u.Nickname,
+			"avatar":   u.Avatar,
+		})
+	}
+	c.JSON(http.StatusOK, gin.H{"users": out})
+}
+
 func (h *Handlers) APIRegister(c *gin.Context) {
 	var req struct {
 		Username  string `json:"username" form:"username" binding:"required"`
@@ -468,6 +539,7 @@ func (h *Handlers) APICreateComment(c *gin.Context) {
 		switch comment.Status {
 		case model.ContentStatusPublished:
 			h.Notify.AsyncNotifyCommentPublished(comment)
+			h.Notify.AsyncNotifyCommentMentions(comment)
 		case model.ContentStatusPending:
 			msg = "评论已提交，审核通过后公开显示"
 			h.Notify.AsyncNotifyPendingComment(comment)
diff --git a/model/models.go b/model/models.go
index 1936004..8970ad1 100644
--- a/model/models.go
+++ b/model/models.go
@@ -199,6 +199,7 @@ const (
 	MessageKindReject       = "reject"        // 帖子被拒/下架
 	MessageKindReportResult = "report_result" // 举报处理结果
 	MessageKindReply        = "reply"         // 帖子/评论被回复
+	MessageKindMention      = "mention"       // 被 @提及
 	MessageKindModeration   = "moderation"    // 新内容待审核（通知管理员）
 )
 
diff --git a/router/router.go b/router/router.go
index 1bc5b63..04ee2f6 100644
--- a/router/router.go
+++ b/router/router.go
@@ -117,10 +117,14 @@ func Setup(cfg *config.Config) (*gin.Engine, error) {
 		pubAPI.GET("/captcha", h.APICaptcha)
 		pubAPI.GET("/register/config", h.APIRegisterConfig)
 		pubAPI.POST("/register/email-code", middleware.RateLimitMiddleware(limiter, "register"), h.APISendRegisterEmailCode)
+		pubAPI.POST("/password-reset/email-code", middleware.RateLimitMiddleware(limiter, "register"), h.APISendResetEmailCode)
+		pubAPI.POST("/password-reset", middleware.RateLimitMiddleware(limiter, "login"), h.APIResetPassword)
 		pubAPI.GET("/posts", h.APIPosts)
 		pubAPI.GET("/posts/hot", h.APIHotPosts)
 		pubAPI.GET("/tags", h.APITags)
 		pubAPI.GET("/comments/recent", h.APIRecentComments)
+		// search 须在 :id 之前
+		pubAPI.GET("/users/search", h.APISearchUsers)
 		pubAPI.GET("/users/:id", h.APIUserPublic)
 		pubAPI.GET("/posts/:id", h.APIPostDetail)
 		pubAPI.GET("/posts/:id/comments", h.APIPostComments)
diff --git a/service/email_code.go b/service/email_code.go
index 248cf62..b2f4a4e 100644
--- a/service/email_code.go
+++ b/service/email_code.go
@@ -2,6 +2,7 @@ package service
 
 import (
 	"crypto/rand"
+	"errors"
 	"math/big"
 	"strings"
 	"sync"
@@ -14,9 +15,12 @@ const (
 	emailCodeLen      = 6
 	emailCodeTTL      = 10 * time.Minute
 	emailCodeCooldown = 60 * time.Second
+
+	EmailCodePurposeRegister = "register"
+	EmailCodePurposeReset    = "reset"
 )
 
-// EmailCodeLen 注册邮箱验证码位数（供 API 告知前端）
+// EmailCodeLen 邮箱验证码位数（供 API 告知前端）
 const EmailCodeLen = emailCodeLen
 
 type emailCodeEntry struct {
@@ -25,7 +29,7 @@ type emailCodeEntry struct {
 	sentAt    time.Time
 }
 
-// EmailCodeService 注册邮箱验证码
+// EmailCodeService 邮箱验证码（按 purpose 隔离）
 type EmailCodeService struct {
 	mu      sync.Mutex
 	entries map[string]emailCodeEntry
@@ -41,20 +45,45 @@ func NewEmailCodeService(mail *MailService) *EmailCodeService {
 	return s
 }
 
-// SendRegisterCode 向邮箱发送注册验证码
+func emailCodeKey(purpose, email string) string {
+	return purpose + ":" + NormalizeEmail(email)
+}
+
+// SendRegisterCode 向邮箱发送注册验证码（邮箱须未注册）
 func (s *EmailCodeService) SendRegisterCode(email string) error {
+	return s.sendCode(EmailCodePurposeRegister, email)
+}
+
+// SendResetCode 向邮箱发送重置密码验证码（邮箱须已注册；不存在时仍返回成功以防枚举）
+func (s *EmailCodeService) SendResetCode(email string) error {
+	return s.sendCode(EmailCodePurposeReset, email)
+}
+
+func (s *EmailCodeService) sendCode(purpose, email string) error {
 	email = NormalizeEmail(email)
 	if err := ValidateEmail(email); err != nil {
 		return err
 	}
 
 	var exist model.User
-	if err := model.DB.Where("email = ?", email).First(&exist).Error; err == nil {
-		return ErrEmailExists
+	found := model.DB.Where("email = ?", email).First(&exist).Error == nil
+	switch purpose {
+	case EmailCodePurposeRegister:
+		if found {
+			return ErrEmailExists
+		}
+	case EmailCodePurposeReset:
+		if !found {
+			// 防邮箱枚举：假装已发送
+			return nil
+		}
+	default:
+		return errors.New("无效的验证码用途")
 	}
 
+	key := emailCodeKey(purpose, email)
 	s.mu.Lock()
-	if prev, ok := s.entries[email]; ok && time.Since(prev.sentAt) < emailCodeCooldown {
+	if prev, ok := s.entries[key]; ok && time.Since(prev.sentAt) < emailCodeCooldown {
 		s.mu.Unlock()
 		return ErrEmailCodeCooldown
 	}
@@ -69,13 +98,18 @@ func (s *EmailCodeService) SendRegisterCode(email string) error {
 	if s.mail != nil && s.mail.settings != nil {
 		siteName = s.mail.settings.SiteBranding().Name
 	}
-	subject, textBody, htmlBody := BuildRegisterCodeMail(siteName, code, int(emailCodeTTL.Minutes()))
+	var subject, textBody, htmlBody string
+	if purpose == EmailCodePurposeReset {
+		subject, textBody, htmlBody = BuildResetCodeMail(siteName, code, int(emailCodeTTL.Minutes()))
+	} else {
+		subject, textBody, htmlBody = BuildRegisterCodeMail(siteName, code, int(emailCodeTTL.Minutes()))
+	}
 	if err := s.mail.SendHTML(email, subject, textBody, htmlBody); err != nil {
 		return err
 	}
 
 	s.mu.Lock()
-	s.entries[email] = emailCodeEntry{
+	s.entries[key] = emailCodeEntry{
 		code:      code,
 		expiresAt: time.Now().Add(emailCodeTTL),
 		sentAt:    time.Now(),
@@ -84,20 +118,26 @@ func (s *EmailCodeService) SendRegisterCode(email string) error {
 	return nil
 }
 
-// Verify 校验邮箱验证码（一次性）
+// Verify 校验邮箱验证码（一次性）；兼容旧调用 Verify(email, code) 视为注册用途
 func (s *EmailCodeService) Verify(email, code string) bool {
+	return s.VerifyPurpose(EmailCodePurposeRegister, email, code)
+}
+
+// VerifyPurpose 按用途校验验证码（一次性）
+func (s *EmailCodeService) VerifyPurpose(purpose, email, code string) bool {
 	email = NormalizeEmail(email)
 	code = strings.TrimSpace(code)
-	if email == "" || code == "" {
+	if purpose == "" || email == "" || code == "" {
 		return false
 	}
+	key := emailCodeKey(purpose, email)
 	s.mu.Lock()
 	defer s.mu.Unlock()
-	entry, ok := s.entries[email]
+	entry, ok := s.entries[key]
 	if !ok {
 		return false
 	}
-	delete(s.entries, email)
+	delete(s.entries, key)
 	if time.Now().After(entry.expiresAt) {
 		return false
 	}
@@ -109,9 +149,9 @@ func (s *EmailCodeService) cleanup() {
 	for range ticker.C {
 		now := time.Now()
 		s.mu.Lock()
-		for email, entry := range s.entries {
+		for key, entry := range s.entries {
 			if now.After(entry.expiresAt) {
-				delete(s.entries, email)
+				delete(s.entries, key)
 			}
 		}
 		s.mu.Unlock()
diff --git a/service/mail_template.go b/service/mail_template.go
index d8ed1b0..f637bf6 100644
--- a/service/mail_template.go
+++ b/service/mail_template.go
@@ -93,6 +93,89 @@ func BuildRegisterCodeMail(siteName, code string, ttlMinutes int) (subject, text
 	return subject, textBody, htmlBody
 }
 
+// BuildResetCodeMail 生成重置密码验证码邮件
+func BuildResetCodeMail(siteName, code string, ttlMinutes int) (subject, textBody, htmlBody string) {
+	siteName = strings.TrimSpace(siteName)
+	if siteName == "" {
+		siteName = "姜十三论坛"
+	}
+	if ttlMinutes <= 0 {
+		ttlMinutes = 10
+	}
+
+	subject = fmt.Sprintf("【%s】重置密码验证码", siteName)
+	spaced := strings.Join(strings.Split(code, ""), " ")
+	textBody = fmt.Sprintf(
+		"你好，\n\n你正在重置 %s 的登录密码。请在页面填写以下验证码：\n\n%s\n\n（共 %d 位数字）\n\n有效期：%d 分钟。\n如非本人操作，请忽略本邮件，账号仍然安全。\n\n— %s\n",
+		siteName, spaced, len(code), ttlMinutes, siteName,
+	)
+
+	safeSite := html.EscapeString(siteName)
+	safeCode := html.EscapeString(code)
+	preheader := html.EscapeString(fmt.Sprintf("重置 %s 密码：请填写邮件中的验证码，有效期 %d 分钟。", siteName, ttlMinutes))
+
+	htmlBody = fmt.Sprintf(`<!DOCTYPE html>
+<html lang="zh-CN">
+<head>
+<meta charset="UTF-8" />
+<meta name="viewport" content="width=device-width, initial-scale=1" />
+<title>%s</title>
+</head>
+<body style="margin:0;padding:0;background:#f5f7fa;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;color:#1f2937;">
+  <div style="display:none;max-height:0;overflow:hidden;opacity:0;color:transparent;mso-hide:all;">%s</div>
+  <table role="presentation" width="100%%" cellpadding="0" cellspacing="0" style="background:#f5f7fa;padding:28px 12px;">
+    <tr>
+      <td align="center">
+        <table role="presentation" width="100%%" cellpadding="0" cellspacing="0" style="max-width:520px;background:#ffffff;border-radius:12px;border:1px solid #e5e7eb;overflow:hidden;">
+          <tr>
+            <td style="padding:20px 28px;background:linear-gradient(135deg,#18a058,#138f4c);color:#ffffff;">
+              <div style="font-size:18px;font-weight:700;letter-spacing:0.02em;">%s</div>
+              <div style="margin-top:4px;font-size:13px;opacity:0.92;">重置密码验证</div>
+            </td>
+          </tr>
+          <tr>
+            <td style="padding:28px;">
+              <p style="margin:0 0 12px;font-size:15px;line-height:1.6;">你好，</p>
+              <p style="margin:0 0 20px;font-size:14px;line-height:1.7;color:#4b5563;">你正在重置 <strong style="color:#111827;">%s</strong> 的登录密码。请在页面输入下方验证码：</p>
+              <div style="margin:0 0 8px;text-align:center;font-size:12px;color:#6b7280;letter-spacing:0.08em;">验 证 码</div>
+              <div style="margin:0 auto 8px;max-width:280px;padding:16px 12px;text-align:center;background:#edfbf3;border:1px solid rgba(24,160,88,0.28);border-radius:10px;font-size:28px;font-weight:700;letter-spacing:0.35em;color:#138f4c;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;">
+                %s
+              </div>
+              <p style="margin:0 0 20px;text-align:center;font-size:12px;color:#9ca3af;">共 %d 位数字，请完整输入</p>
+              <table role="presentation" width="100%%" cellpadding="0" cellspacing="0" style="margin:0 0 20px;background:#f8fafc;border-radius:8px;">
+                <tr>
+                  <td style="padding:12px 14px;font-size:13px;line-height:1.6;color:#4b5563;">
+                    <strong style="color:#111827;">有效期</strong>：%d 分钟<br />
+                    超时请返回页面重新获取验证码。
+                  </td>
+                </tr>
+              </table>
+              <p style="margin:0;font-size:12px;line-height:1.6;color:#9ca3af;">如非本人操作，请忽略本邮件。请勿将验证码告知他人。</p>
+            </td>
+          </tr>
+          <tr>
+            <td style="padding:14px 28px;border-top:1px solid #f1f5f9;font-size:12px;color:#9ca3af;text-align:center;">
+              此邮件由 %s 自动发送，请勿直接回复
+            </td>
+          </tr>
+        </table>
+      </td>
+    </tr>
+  </table>
+</body>
+</html>`,
+		html.EscapeString(subject),
+		preheader,
+		safeSite,
+		safeSite,
+		safeCode,
+		len(code),
+		ttlMinutes,
+		safeSite,
+	)
+	return subject, textBody, htmlBody
+}
+
 // BuildReplyMail 生成「收到新回复」提醒邮件
 // displayFloor 为页面可见顶层楼号；底部展示帖子主题，不展示路径 URL。
 func BuildReplyMail(siteName, authorName, postTitle string, displayFloor int, isNested bool, excerpt, link string) (subject, textBody, htmlBody string) {
diff --git a/service/mention.go b/service/mention.go
new file mode 100644
index 0000000..cdfd165
--- /dev/null
+++ b/service/mention.go
@@ -0,0 +1,65 @@
+package service
+
+import (
+	"regexp"
+	"strings"
+
+	"git.iioio.com/freefire/jiang13-forum/model"
+)
+
+const maxMentionsPerContent = 10
+
+// 与前端 highlightMentions 字符集对齐（字母数字下划线中文，兼容历史 -）
+// Go RE2 不支持 JS 的 \uXXXX，需用 \x{HHHH}
+var mentionPattern = regexp.MustCompile(`@([0-9A-Za-z_\x{4e00}-\x{9fa5}-]+)`)
+
+// ExtractMentionNames 从纯文本提取 @提及名（去重、保序）
+func ExtractMentionNames(text string) []string {
+	matches := mentionPattern.FindAllStringSubmatch(text, -1)
+	if len(matches) == 0 {
+		return nil
+	}
+	seen := make(map[string]struct{}, len(matches))
+	out := make([]string, 0, len(matches))
+	for _, m := range matches {
+		name := strings.TrimSpace(m[1])
+		if name == "" {
+			continue
+		}
+		key := strings.ToLower(name)
+		if _, ok := seen[key]; ok {
+			continue
+		}
+		seen[key] = struct{}{}
+		out = append(out, name)
+		if len(out) >= maxMentionsPerContent {
+			break
+		}
+	}
+	return out
+}
+
+// ResolveMentionUserIDs 将提及名解析为用户 ID（优先 username，其次 nickname；排除 excludeUserID）
+func ResolveMentionUserIDs(names []string, excludeUserID uint) []uint {
+	if len(names) == 0 {
+		return nil
+	}
+	ids := make([]uint, 0, len(names))
+	seen := make(map[uint]struct{}, len(names))
+	for _, name := range names {
+		var u model.User
+		err := model.DB.Select("id").Where("username = ?", name).First(&u).Error
+		if err != nil {
+			err = model.DB.Select("id").Where("nickname = ?", name).First(&u).Error
+		}
+		if err != nil || u.ID == 0 || u.ID == excludeUserID {
+			continue
+		}
+		if _, ok := seen[u.ID]; ok {
+			continue
+		}
+		seen[u.ID] = struct{}{}
+		ids = append(ids, u.ID)
+	}
+	return ids
+}
diff --git a/service/mention_test.go b/service/mention_test.go
new file mode 100644
index 0000000..4161806
--- /dev/null
+++ b/service/mention_test.go
@@ -0,0 +1,14 @@
+package service
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestExtractMentionNames(t *testing.T) {
+	got := ExtractMentionNames("hi @alice 和 @小明_x 以及 @bob-1")
+	want := []string{"alice", "小明_x", "bob-1"}
+	if !reflect.DeepEqual(got, want) {
+		t.Fatalf("got %#v, want %#v", got, want)
+	}
+}
diff --git a/service/notify.go b/service/notify.go
index e35e1d9..b2800b0 100644
--- a/service/notify.go
+++ b/service/notify.go
@@ -43,6 +43,15 @@ func (s *NotifyService) AsyncNotifyCommentPublished(comment *model.Comment) {
 	s.goNotify(func() { s.NotifyCommentPublished(&cp) })
 }
 
+// AsyncNotifyCommentMentions 异步：评论公开后通知被 @ 的用户
+func (s *NotifyService) AsyncNotifyCommentMentions(comment *model.Comment) {
+	if s == nil || comment == nil {
+		return
+	}
+	cp := *comment
+	s.goNotify(func() { s.NotifyCommentMentions(&cp) })
+}
+
 // AsyncNotifyPendingPost 异步：待审帖通知管理员
 func (s *NotifyService) AsyncNotifyPendingPost(post *model.Post) {
 	if s == nil || post == nil {
@@ -92,6 +101,41 @@ func (s *NotifyService) NotifyCommentPublished(comment *model.Comment) {
 	s.sendReplyMail(toUserID, authorName, title, comment.PostID, displayFloor, isNested, comment.Content)
 }
 
+// NotifyCommentMentions 评论公开后通知被 @提及的用户（跳过已收到回复通知的人）
+func (s *NotifyService) NotifyCommentMentions(comment *model.Comment) {
+	if s == nil || comment == nil || comment.Status != model.ContentStatusPublished {
+		return
+	}
+	names := ExtractMentionNames(comment.Content)
+	ids := ResolveMentionUserIDs(names, comment.UserID)
+	if len(ids) == 0 {
+		return
+	}
+
+	post, err := s.loadPost(comment.PostID)
+	if err != nil {
+		return
+	}
+	// 已作为回复对象收到通知的用户不再重复发 mention
+	replyTo, _ := s.resolveReplyRecipient(comment, post)
+	authorName := s.commentAuthorName(comment)
+	title := post.Title
+	if title == "" {
+		title = "未知帖子"
+	}
+	displayFloor := s.resolveDisplayFloor(comment)
+	pid := comment.PostID
+	subject := "有人 @了你"
+	content := FormatMentionContent(authorName, title, displayFloor)
+
+	for _, uid := range ids {
+		if uid == 0 || uid == comment.UserID || uid == replyTo {
+			continue
+		}
+		_, _ = s.messages.SendSystem(uid, subject, content, model.MessageKindMention, &pid, nil)
+	}
+}
+
 // NotifyPendingPost 新帖进入待审时通知全部管理员
 func (s *NotifyService) NotifyPendingPost(post *model.Post) {
 	if s == nil || post == nil || post.Status != model.ContentStatusPending {
@@ -295,6 +339,11 @@ func FormatReplyContent(authorName, postTitle string, displayFloor int, isNested
 	return fmt.Sprintf("%s 在《%s》发表了 #%d 楼。", authorName, postTitle, displayFloor)
 }
 
+// FormatMentionContent @提及站内通知正文
+func FormatMentionContent(authorName, postTitle string, displayFloor int) string {
+	return fmt.Sprintf("%s 在《%s》#%d 楼中提到了你。", authorName, postTitle, displayFloor)
+}
+
 // FormatPendingPostContent 待审帖站内私信正文
 func FormatPendingPostContent(authorName, postTitle string, postID uint) string {
 	return fmt.Sprintf(
diff --git a/service/post.go b/service/post.go
index da4d2eb..8bc30dc 100644
--- a/service/post.go
+++ b/service/post.go
@@ -35,6 +35,8 @@ type PostListQuery struct {
 	Size          int
 	Keyword       string
 	Tag           string // 精确标签筛选（整枚匹配，不走 keyword LIKE）
+	Author        string // 作者用户名或昵称（解析为 UserID）
+	TitleOnly     bool   // 关键词仅匹配标题
 	Sort          string // latest | reply | hot
 	ViewerID      uint   // 当前查看者（用于 pending 仅作者可见）
 	ViewerIsAdmin bool
@@ -127,14 +129,29 @@ func parseSQLiteTime(s string) (time.Time, bool) {
 	return time.Time{}, false
 }
 
+// HotPosts 近期活跃讨论（近 7 日有公开回复，按最后回复时间倒序）
 func (s *PostService) HotPosts(limit int) ([]PostListItem, error) {
 	if limit <= 0 {
 		limit = 10
 	}
+	since := time.Now().Add(-7 * 24 * time.Hour)
 	var posts []model.Post
 	err := model.DB.Preload("User").Preload("Board").
 		Where("status = ?", model.ContentStatusPublished).
-		Order("like_count desc, view_count desc").Limit(limit).Find(&posts).Error
+		Where(`EXISTS (
+			SELECT 1 FROM comments
+			WHERE comments.post_id = posts.id
+			AND comments.deleted_at IS NULL
+			AND comments.status = ?
+			AND comments.created_at >= ?
+		)`, model.ContentStatusPublished, since).
+		Order(`(
+			SELECT MAX(created_at) FROM comments
+			WHERE comments.post_id = posts.id
+			AND comments.deleted_at IS NULL
+			AND comments.status = 'published'
+		) DESC`).
+		Limit(limit).Find(&posts).Error
 	if err != nil {
 		return nil, err
 	}
@@ -143,9 +160,14 @@ func (s *PostService) HotPosts(limit int) ([]PostListItem, error) {
 		ids[i] = p.ID
 	}
 	countMap := s.commentCountMap(ids)
+	replyMap := s.lastReplyMap(ids)
 	items := make([]PostListItem, len(posts))
 	for i, p := range posts {
-		items[i] = PostListItem{Post: p, CommentCount: countMap[p.ID]}
+		items[i] = PostListItem{
+			Post:         p,
+			CommentCount: countMap[p.ID],
+			LastReplyAt:  replyMap[p.ID],
+		}
 	}
 	return items, nil
 }
@@ -260,6 +282,15 @@ func (s *PostService) List(q PostListQuery) ([]model.Post, int64, error) {
 		}
 		q.Keyword = kw
 	}
+	if q.UserID == 0 {
+		if author := strings.TrimSpace(q.Author); author != "" {
+			if uid, ok := resolveAuthorUserID(author); ok {
+				q.UserID = uid
+			} else {
+				return []model.Post{}, 0, nil
+			}
+		}
+	}
 	db := model.DB.Model(&model.Post{}).Preload("User").Preload("Board")
 	db = applyPostVisibility(db, q)
 	if q.BoardID > 0 {
@@ -270,7 +301,11 @@ func (s *PostService) List(q PostListQuery) ([]model.Post, int64, error) {
 	}
 	if q.Keyword != "" {
 		kw := "%" + q.Keyword + "%"
-		db = db.Where("title LIKE ? OR content_plain LIKE ? OR tags LIKE ?", kw, kw, kw)
+		if q.TitleOnly {
+			db = db.Where("title LIKE ?", kw)
+		} else {
+			db = db.Where("title LIKE ? OR content_plain LIKE ? OR tags LIKE ?", kw, kw, kw)
+		}
 	}
 	if tag := strings.TrimSpace(q.Tag); tag != "" {
 		// 整枚标签匹配：逗号/中文逗号分隔，忽略标签两侧空格，大小写不敏感
@@ -325,6 +360,22 @@ func escapeLikePattern(s string) string {
 	return s
 }
 
+// resolveAuthorUserID 按用户名精确匹配，否则按昵称精确匹配（优先用户名）
+func resolveAuthorUserID(author string) (uint, bool) {
+	author = strings.TrimSpace(author)
+	if author == "" {
+		return 0, false
+	}
+	var u model.User
+	if err := model.DB.Select("id").Where("username = ?", author).First(&u).Error; err == nil {
+		return u.ID, true
+	}
+	if err := model.DB.Select("id").Where("nickname = ?", author).First(&u).Error; err == nil {
+		return u.ID, true
+	}
+	return 0, false
+}
+
 func (s *PostService) FindByID(id uint) (*model.Post, error) {
 	var post model.Post
 	err := model.DB.Preload("User").Preload("Board").First(&post, id).Error
diff --git a/service/user.go b/service/user.go
index a135354..7cfff55 100644
--- a/service/user.go
+++ b/service/user.go
@@ -72,6 +72,57 @@ func (s *UserService) GetByUsername(username string) (*model.User, error) {
 	return &user, nil
 }
 
+// GetByEmail 按邮箱查询
+func (s *UserService) GetByEmail(email string) (*model.User, error) {
+	email = NormalizeEmail(email)
+	var user model.User
+	if err := model.DB.Where("email = ?", email).First(&user).Error; err != nil {
+		return nil, err
+	}
+	return &user, nil
+}
+
+// ResetPasswordByEmail 通过邮箱重置密码（已通过验证码校验）
+func (s *UserService) ResetPasswordByEmail(email, newPass string) error {
+	if err := ValidatePassword(newPass, s.settings.PasswordMinLen()); err != nil {
+		return err
+	}
+	user, err := s.GetByEmail(email)
+	if err != nil {
+		return errors.New("用户不存在")
+	}
+	hash, err := HashPassword(newPass)
+	if err != nil {
+		return err
+	}
+	return model.DB.Model(&model.User{}).Where("id = ?", user.ID).Update("password", hash).Error
+}
+
+// SearchUsersBrief 公开用户搜索（@补全）：匹配用户名/昵称，不含邮箱
+func (s *UserService) SearchUsersBrief(keyword string, limit int) ([]model.User, error) {
+	keyword = strings.TrimSpace(keyword)
+	if keyword == "" {
+		return []model.User{}, nil
+	}
+	if limit <= 0 || limit > 20 {
+		limit = 8
+	}
+	like := "%" + keyword + "%"
+	var users []model.User
+	err := model.DB.Select("id", "username", "nickname", "avatar", "role", "verified").
+		Where("username LIKE ? OR nickname LIKE ?", like, like).
+		Order("username ASC").
+		Limit(limit).
+		Find(&users).Error
+	if err != nil {
+		return nil, err
+	}
+	if users == nil {
+		users = []model.User{}
+	}
+	return users, nil
+}
+
 // UpdateNickname 修改昵称
 func (s *UserService) UpdateNickname(userID uint, nickname string) error {
 	nickname = strings.TrimSpace(nickname)