diff --git a/frontend/src/routes/user-management/Page.tsx b/frontend/src/routes/user-management/Page.tsx
index 23f70e6..f04e967 100644
--- a/frontend/src/routes/user-management/Page.tsx
+++ b/frontend/src/routes/user-management/Page.tsx
@@ -1,6 +1,6 @@
 import type { FormEvent } from 'react'
 import { useCallback, useEffect, useState } from 'react'
-import { Check, Info, Plus, X } from 'lucide-react'
+import { ArrowUpRight, Check, Info, Plus, X } from 'lucide-react'
 
 import { statusLabel } from '../../constants/user'
 import type { User, UserForm, Status } from '../../interfaces/user/model'
@@ -9,11 +9,13 @@ import styles from './index.module.scss'
 import DirectoryToolbar from './components/DirectoryToolbar'
 import SummaryCards from './components/SummaryCards'
 import UserDrawer from './components/UserDrawer'
+import UserProfilePanel from './components/UserProfilePanel'
 import UserTable from './components/UserTable'
 
 export default function UserManagementPage() {
   const [keyword, setKeyword] = useState('')
   const [editingUser, setEditingUser] = useState<User | null>(null)
+  const [selectedUserId, setSelectedUserId] = useState<number | null>(null)
   const [isFormOpen, setIsFormOpen] = useState(false)
   const [notice, setNotice] = useState('')
   const {
@@ -30,6 +32,16 @@ export default function UserManagementPage() {
 
   useEffect(() => { void refreshData() }, [refreshData, search, roleFilter, statusFilter])
 
+  useEffect(() => {
+    if (users.length === 0) {
+      setSelectedUserId(null)
+      return
+    }
+    if (!selectedUserId || !users.some((user) => user.id === selectedUserId)) {
+      setSelectedUserId(users[0].id)
+    }
+  }, [selectedUserId, users])
+
   useEffect(() => {
     if (!notice) return undefined
     const timer = window.setTimeout(() => setNotice(''), 3200)
@@ -88,25 +100,29 @@ export default function UserManagementPage() {
   const allSelected = users.length > 0 && selectedIds.size === users.length
   const activeFilters = Boolean(search || roleFilter || statusFilter)
   const combinedError = error
+  const selectedUser = users.find((user) => user.id === selectedUserId) ?? users[0] ?? null
 
   return (
-    <main className={`app-shell ${styles.page}`}>
-      <header className="topbar"><div className="topbar-inner"><div className="brand-lockup"><div className="brand-mark">U</div><div><p className="brand-name">云端工作台</p><p className="brand-context">组织管理中心</p></div></div><div className="topbar-meta"><span className="status-dot" />系统运行正常<span className="topbar-divider" />管理员视图</div></div></header>
-      <section className="content-wrap" aria-labelledby="page-title">
-        <div className="breadcrumb"><span>工作台</span><span>/</span><strong>用户管理</strong></div>
-        <div className="page-heading"><div><p className="eyebrow">成员目录 / DIRECTORY</p><h1 id="page-title">用户管理</h1><p className="page-summary">集中管理组织成员、角色和访问状态。</p></div><button className="primary-button" type="button" onClick={openCreate}><Plus className="button-icon" size={17} />新增用户</button></div>
+    <main className={styles.page}>
+      <header className={styles.topbar}><div className={styles.topbarInner}><div className={styles.brandLockup}><span className={styles.brandMark}>U</span><span><strong>云端工作台</strong><small>组织管理中心</small></span></div><div className={styles.topbarMeta}><span className={styles.statusDot} />系统运行正常<span className={styles.topbarDivider} />管理员视图</div></div></header>
+      <section className={styles.content} aria-labelledby="page-title">
+        <div className={styles.breadcrumb}><span>工作台</span><span>/</span><strong>用户管理</strong></div>
+        <div className={styles.pageHeading}><div><p className={styles.eyebrow}>ROSTER / MEMBER RECORDS</p><h1 id="page-title">用户管理</h1><p className={styles.pageSummary}>先找到成员，再查看档案和访问范围。</p></div><button className={styles.primaryButton} type="button" onClick={openCreate}><Plus size={17} />新增用户</button></div>
         <SummaryCards summary={summary} />
-        <div className="section-heading"><div><h2>成员列表</h2><p>查看并更新组织内的账号信息。</p></div><span className="result-count">共 {total} 位用户</span></div>
-        <section className="directory-section">
-          <DirectoryToolbar keyword={keyword} roleFilter={roleFilter} statusFilter={statusFilter} hasFilters={activeFilters} onKeywordChange={setKeyword} onSearch={submitSearch} onRoleChange={setRoleFilter} onStatusChange={setStatusFilter} onClear={clearAllFilters} />
-          {selectedIds.size > 0 && <div className="bulk-toolbar"><span>已选择 <strong>{selectedIds.size}</strong> 位用户</span><div><button type="button" className="bulk-button" disabled={isBulkUpdating} onClick={() => void updateStatus('ACTIVE')}>设为活跃</button><button type="button" className="bulk-button" disabled={isBulkUpdating} onClick={() => void updateStatus('INACTIVE')}>设为未激活</button></div></div>}
-          {combinedError && <div className="error-banner" role="alert"><span>{combinedError}</span><button type="button" onClick={clearError} aria-label="关闭错误提示"><X size={17} /></button></div>}
-          <div className="table-frame" aria-live="polite">
-            {isLoading ? <div className="empty-state"><span className="loading-ring" />正在加载用户列表</div> : users.length === 0 ? <div className="empty-state"><Info className="empty-icon" size={27} /><strong>没有找到匹配用户</strong><span>试试其他关键词，或直接新增一个用户。</span>{activeFilters && <button className="secondary-button" type="button" onClick={clearAllFilters}>清除筛选</button>}</div> : <UserTable users={users} selectedIds={selectedIds} allSelected={allSelected} onToggleAll={toggleAll} onToggleSelected={toggleSelected} onEdit={openEdit} onDelete={(user) => void removeUser(user)} />}
-          </div>
-        </section>
+        <div className={styles.workspace}>
+          <section className={styles.directoryPanel} aria-labelledby="member-list-title">
+            <div className={styles.panelHeading}><div><p className={styles.eyebrow}>DIRECTORY / 目录</p><h2 id="member-list-title">成员列表</h2></div><span>共 {total} 位用户</span></div>
+            <DirectoryToolbar keyword={keyword} roleFilter={roleFilter} statusFilter={statusFilter} hasFilters={activeFilters} onKeywordChange={setKeyword} onSearch={submitSearch} onRoleChange={setRoleFilter} onStatusChange={setStatusFilter} onClear={clearAllFilters} />
+            {selectedIds.size > 0 && <div className={styles.bulkToolbar}><span>已选择 <strong>{selectedIds.size}</strong> 位</span><div><button type="button" className={styles.bulkButton} disabled={isBulkUpdating} onClick={() => void updateStatus('ACTIVE')}>设为活跃</button><button type="button" className={styles.bulkButton} disabled={isBulkUpdating} onClick={() => void updateStatus('INACTIVE')}>设为未激活</button></div></div>}
+            {combinedError && <div className={styles.errorBanner} role="alert"><span>{combinedError}</span><button type="button" onClick={clearError} aria-label="关闭错误提示"><X size={17} /></button></div>}
+            <div className={styles.tableFrame} aria-live="polite">
+              {isLoading ? <div className={styles.emptyState}><span className={styles.loadingRing} />正在加载用户列表</div> : users.length === 0 ? <div className={styles.emptyState}><Info className={styles.emptyIcon} size={27} /><strong>没有找到匹配用户</strong><span>试试其他关键词，或直接新增一个用户。</span>{activeFilters && <button className={styles.secondaryButton} type="button" onClick={clearAllFilters}>清除筛选</button>}</div> : <UserTable users={users} selectedIds={selectedIds} selectedUserId={selectedUser?.id ?? null} allSelected={allSelected} onToggleAll={toggleAll} onToggleSelected={toggleSelected} onSelect={setSelectedUserId} onEdit={openEdit} onDelete={(user) => void removeUser(user)} />}
+            </div>
+          </section>
+          <UserProfilePanel user={selectedUser} onEdit={openEdit} onCreate={openCreate} />
+        </div>
       </section>
-      {notice && <div className="toast" role="status"><span className="toast-icon"><Check size={12} /></span>{notice}</div>}
+      {notice && <div className={styles.toast} role="status"><span><Check size={12} /></span>{notice}</div>}
       <UserDrawer user={editingUser} isOpen={isFormOpen} isSaving={isSaving} error={error} onClose={() => setIsFormOpen(false)} onSubmit={(form) => void submitForm(form)} />
     </main>
   )
diff --git a/frontend/src/routes/user-management/components/DirectoryToolbar/index.module.scss b/frontend/src/routes/user-management/components/DirectoryToolbar/index.module.scss
index 287be9e..abedf2b 100644
--- a/frontend/src/routes/user-management/components/DirectoryToolbar/index.module.scss
+++ b/frontend/src/routes/user-management/components/DirectoryToolbar/index.module.scss
@@ -1,3 +1,22 @@
-.root {
-  min-width: 0;
+.root { min-width: 0; }
+.searchForm { position: relative; display: flex; align-items: center; gap: 8px; padding: 14px 0 12px; border-bottom: 1px solid var(--page-rule); }
+.searchIcon { flex: 0 0 auto; color: var(--page-muted); }
+.searchForm input { width: min(280px, 100%); height: 36px; padding: 0; border: 0; outline: 0; background: transparent; color: var(--page-ink); font-size: 12px; }
+.searchForm input::placeholder { color: var(--page-muted); }
+.searchButton { min-height: 30px; padding: 0 10px; border: 1px solid var(--page-rule); background: transparent; color: var(--page-ink); font-size: 11px; font-weight: 700; }
+.searchButton:hover { border-color: var(--page-accent); color: var(--page-accent); }
+.filterGroup { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px 0 7px; }
+.filterGroup select { width: 150px; height: 34px; padding: 0 10px; border: 1px solid var(--page-rule); outline: 0; background: var(--page-surface); color: var(--page-ink); font-size: 11px; }
+.filterGroup select:focus { border-color: var(--page-accent); box-shadow: 0 0 0 3px rgb(43 118 128 / 11%); }
+.clearButton { padding: 0; border: 0; background: transparent; color: var(--page-accent); font-size: 11px; font-weight: 700; }
+.clearButton:hover { text-decoration: underline; }
+.statusTabs { display: flex; gap: 3px; border-bottom: 1px solid var(--page-rule); }
+.statusTabs button { position: relative; min-height: 35px; padding: 0 12px; border: 0; background: transparent; color: var(--page-muted); font-size: 11px; font-weight: 700; }
+.statusTabs button:hover, .statusTabs .active { color: var(--page-ink); }
+.statusTabs .active::after { position: absolute; right: 9px; bottom: -1px; left: 9px; height: 2px; background: var(--page-accent); content: ""; }
+.srOnly { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
+
+@media (max-width: 760px) {
+  .searchForm input { flex: 1; width: auto; }
+  .filterGroup { padding-top: 10px; }
 }
diff --git a/frontend/src/routes/user-management/components/DirectoryToolbar/index.tsx b/frontend/src/routes/user-management/components/DirectoryToolbar/index.tsx
index 7350e77..2cbe408 100644
--- a/frontend/src/routes/user-management/components/DirectoryToolbar/index.tsx
+++ b/frontend/src/routes/user-management/components/DirectoryToolbar/index.tsx
@@ -20,25 +20,25 @@ interface DirectoryToolbarProps {
 export default function DirectoryToolbar(props: DirectoryToolbarProps) {
   return (
     <>
-      <div className={`filter-toolbar ${styles.root}`}>
-        <form className="search-form" onSubmit={props.onSearch}>
-          <label className="sr-only" htmlFor="user-search">搜索用户</label>
-          <Search className="search-icon" aria-hidden="true" size={18} />
+      <div className={styles.root}>
+        <form className={styles.searchForm} onSubmit={props.onSearch}>
+          <label className={styles.srOnly} htmlFor="user-search">搜索用户</label>
+          <Search className={styles.searchIcon} aria-hidden="true" size={17} />
           <input id="user-search" value={props.keyword} onChange={(event) => props.onKeywordChange(event.target.value)} placeholder="搜索姓名或邮箱" />
-          <button type="submit" className="secondary-button">搜索</button>
+          <button type="submit" className={styles.searchButton}>搜索</button>
         </form>
-        <div className="filter-group">
-          <label className="sr-only" htmlFor="role-filter">按角色筛选</label>
+        <div className={styles.filterGroup}>
+          <label className={styles.srOnly} htmlFor="role-filter">按角色筛选</label>
           <select id="role-filter" value={props.roleFilter} onChange={(event) => props.onRoleChange(event.target.value as Role | '')}>
             <option value="">全部角色</option>
             {ROLE_OPTIONS.map((role) => <option value={role} key={role}>{roleLabel(role)}</option>)}
           </select>
-          {props.hasFilters && <button className="clear-button" type="button" onClick={props.onClear}>清除筛选</button>}
+          {props.hasFilters && <button className={styles.clearButton} type="button" onClick={props.onClear}>清除筛选</button>}
         </div>
       </div>
-      <div className="status-tabs" role="group" aria-label="按状态筛选">
+      <div className={styles.statusTabs} role="group" aria-label="按状态筛选">
         {STATUS_OPTIONS.map((option) => (
-          <button className={props.statusFilter === option.value ? 'active' : ''} type="button" key={option.value} onClick={() => props.onStatusChange(option.value)}>
+          <button className={props.statusFilter === option.value ? styles.active : ''} type="button" key={option.value} onClick={() => props.onStatusChange(option.value)}>
             {option.label}
           </button>
         ))}
diff --git a/frontend/src/routes/user-management/components/SummaryCards/index.module.scss b/frontend/src/routes/user-management/components/SummaryCards/index.module.scss
index 287be9e..885afe7 100644
--- a/frontend/src/routes/user-management/components/SummaryCards/index.module.scss
+++ b/frontend/src/routes/user-management/components/SummaryCards/index.module.scss
@@ -1,3 +1,16 @@
-.root {
-  min-width: 0;
+.root { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border: 1px solid var(--page-rule); background: var(--page-surface); }
+.card { min-width: 0; padding: 17px 19px 15px; border-right: 1px solid var(--page-rule); }
+.card:last-child { border-right: 0; }
+.cardTop { display: flex; align-items: center; justify-content: space-between; gap: 8px; color: var(--page-muted); font-size: 11px; font-weight: 700; }
+.cardTop b { display: grid; width: 28px; height: 28px; place-items: center; background: var(--page-surface-2); color: var(--page-accent); }
+.card strong { display: block; margin-top: 10px; color: var(--page-ink); font-family: Georgia, serif; font-size: 27px; font-weight: 400; line-height: 1; }
+.card small { display: block; margin-top: 8px; color: var(--page-muted); font-size: 10px; }
+.green .cardTop b { color: #3f8a61; }
+.amber .cardTop b { color: #ae7a2a; }
+.navy .cardTop b { color: #456d80; }
+
+@media (max-width: 760px) {
+  .root { grid-template-columns: repeat(2, minmax(0, 1fr)); }
+  .card:nth-child(2) { border-right: 0; }
+  .card:nth-child(-n + 2) { border-bottom: 1px solid var(--page-rule); }
 }
diff --git a/frontend/src/routes/user-management/components/SummaryCards/index.tsx b/frontend/src/routes/user-management/components/SummaryCards/index.tsx
index 2674043..a3abe8e 100644
--- a/frontend/src/routes/user-management/components/SummaryCards/index.tsx
+++ b/frontend/src/routes/user-management/components/SummaryCards/index.tsx
@@ -25,12 +25,12 @@ export default function SummaryCards({ summary }: SummaryCardsProps) {
   ]
 
   return (
-    <section className={`summary-grid ${styles.root}`} aria-label="用户概览">
+    <section className={styles.root} aria-label="用户概览">
       {cards.map((card) => {
         const Icon = card.icon
         return (
-          <article className={`summary-card ${card.tone}`} key={card.label}>
-            <div className="summary-card-top"><span>{card.label}</span><b aria-hidden="true"><Icon size={15} /></b></div>
+          <article className={`${styles.card} ${styles[card.tone]}`} key={card.label}>
+            <div className={styles.cardTop}><span>{card.label}</span><b aria-hidden="true"><Icon size={15} /></b></div>
             <strong>{card.value}</strong>
             <small>{card.detail}</small>
           </article>
diff --git a/frontend/src/routes/user-management/components/UserDrawer/index.module.scss b/frontend/src/routes/user-management/components/UserDrawer/index.module.scss
index 287be9e..29f6ab8 100644
--- a/frontend/src/routes/user-management/components/UserDrawer/index.module.scss
+++ b/frontend/src/routes/user-management/components/UserDrawer/index.module.scss
@@ -1,3 +1,30 @@
-.root {
-  min-width: 0;
+.backdrop { position: fixed; inset: 0; z-index: 400; display: flex; justify-content: end; background: rgb(16 33 38 / 42%); }
+.drawer { overflow: auto; width: min(100%, 430px); min-height: 100%; padding: 30px; background: var(--page-surface); color: var(--page-ink); box-shadow: -18px 0 35px rgb(16 33 38 / 16%); animation: slideIn .2s ease-out; }
+.heading { display: flex; align-items: start; justify-content: space-between; gap: 20px; margin-bottom: 28px; }
+.eyebrow { margin: 0; color: var(--page-muted); font-size: 10px; font-weight: 800; letter-spacing: .14em; }
+.heading h2 { margin: 11px 0 0; color: var(--page-ink); font-family: Georgia, serif; font-size: 29px; font-weight: 400; letter-spacing: -.04em; }
+.heading p:last-child { margin: 9px 0 0; color: var(--page-muted); font-size: 12px; }
+.closeButton { display: grid; width: 34px; height: 34px; place-items: center; padding: 0; border: 1px solid var(--page-rule); background: transparent; color: var(--page-ink); }
+.closeButton:hover { border-color: var(--page-accent); color: var(--page-accent); }
+.drawer form { display: grid; gap: 18px; }
+.drawer label { display: grid; gap: 7px; color: var(--page-ink); font-size: 11px; font-weight: 750; }
+.drawer input, .drawer select { width: 100%; height: 42px; padding: 0 11px; border: 1px solid var(--page-rule); outline: 2px solid transparent; outline-offset: 1px; background: transparent; color: var(--page-ink); font-size: 12px; }
+.drawer input:focus, .drawer select:focus { border-color: var(--page-accent); outline-color: var(--page-accent); }
+.error { padding: 11px 12px; border: 1px solid #d7a39a; background: #fff5f2; color: #9d4639; font-size: 11px; line-height: 1.5; }
+.formGrid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
+.note { display: flex; align-items: start; gap: 9px; padding: 11px 12px; background: var(--page-surface-2); color: var(--page-muted); }
+.note svg { flex: 0 0 auto; color: var(--page-accent); }
+.note p { margin: 0; font-size: 11px; line-height: 1.5; }
+.actions { display: flex; justify-content: end; gap: 9px; margin-top: 7px; }
+.secondaryButton, .primaryButton { min-height: 42px; padding: 0 15px; border: 1px solid var(--page-rule); font-size: 12px; font-weight: 750; }
+.secondaryButton { background: transparent; color: var(--page-ink); }
+.secondaryButton:hover { border-color: var(--page-accent); color: var(--page-accent); }
+.primaryButton { border-color: var(--page-accent); background: var(--page-accent); color: var(--page-accent-ink); }
+.primaryButton:hover { filter: brightness(.95); }
+.primaryButton:disabled { cursor: wait; opacity: .6; }
+@keyframes slideIn { from { opacity: .35; transform: translateX(20px); } to { opacity: 1; transform: translateX(0); } }
+
+@media (max-width: 640px) {
+  .drawer { align-self: end; max-height: 94vh; padding: 24px 20px; border-radius: 14px 14px 0 0; animation: riseIn .2s ease-out; }
+  @keyframes riseIn { from { opacity: .35; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
 }
diff --git a/frontend/src/routes/user-management/components/UserDrawer/index.tsx b/frontend/src/routes/user-management/components/UserDrawer/index.tsx
index d89b1aa..39c5424 100644
--- a/frontend/src/routes/user-management/components/UserDrawer/index.tsx
+++ b/frontend/src/routes/user-management/components/UserDrawer/index.tsx
@@ -29,16 +29,16 @@ export default function UserDrawer(props: UserDrawerProps) {
   if (!props.isOpen) return null
 
   return (
-    <div className={`drawer-backdrop ${styles.root}`} role="presentation" onMouseDown={(event) => { if (event.target === event.currentTarget) props.onClose() }}>
-      <aside className="drawer" role="dialog" aria-modal="true" aria-labelledby="form-title">
-        <div className="drawer-heading"><div><p className="eyebrow">USER RECORD / 用户档案</p><h2 id="form-title">{props.user ? '编辑用户' : '新增用户'}</h2><p>填写账号资料并设置访问状态。</p></div><button className="close-button" type="button" aria-label="关闭" onClick={props.onClose}><X size={20} /></button></div>
+    <div className={styles.backdrop} role="presentation" onMouseDown={(event) => { if (event.target === event.currentTarget) props.onClose() }}>
+      <aside className={styles.drawer} role="dialog" aria-modal="true" aria-labelledby="form-title">
+        <div className={styles.heading}><div><p className={styles.eyebrow}>USER RECORD / 用户档案</p><h2 id="form-title">{props.user ? '编辑用户' : '新增用户'}</h2><p>填写账号资料并设置访问状态。</p></div><button className={styles.closeButton} type="button" aria-label="关闭" onClick={props.onClose}><X size={20} /></button></div>
         <form onSubmit={(event) => { event.preventDefault(); props.onSubmit(form) }}>
-          {props.error && <div className="drawer-error" role="alert">{props.error}</div>}
+          {props.error && <div className={styles.error} role="alert">{props.error}</div>}
           <label>姓名<input required maxLength={80} value={form.fullName} onChange={(event) => setForm({ ...form, fullName: event.target.value })} placeholder="例如：林晓晨" /></label>
           <label>邮箱地址<input required type="email" maxLength={160} value={form.email} onChange={(event) => setForm({ ...form, email: event.target.value })} placeholder="name@company.com" /></label>
-          <div className="form-grid"><label>角色<select value={form.role} onChange={(event) => setForm({ ...form, role: event.target.value as UserForm['role'] })}>{ROLE_OPTIONS.map((role) => <option value={role} key={role}>{roleLabel(role)}</option>)}</select></label><label>状态<select value={form.status} onChange={(event) => setForm({ ...form, status: event.target.value as Status })}><option value="ACTIVE">活跃</option><option value="INACTIVE">未激活</option></select></label></div>
-          <div className="form-note"><Info size={17} /><p>停用账号后，用户将无法访问组织工作台。</p></div>
-          <div className="drawer-actions"><button type="button" className="secondary-button" onClick={props.onClose}>取消</button><button disabled={props.isSaving} type="submit" className="primary-button">{props.isSaving ? '保存中...' : props.user ? '保存修改' : '创建用户'}</button></div>
+          <div className={styles.formGrid}><label>角色<select value={form.role} onChange={(event) => setForm({ ...form, role: event.target.value as UserForm['role'] })}>{ROLE_OPTIONS.map((role) => <option value={role} key={role}>{roleLabel(role)}</option>)}</select></label><label>状态<select value={form.status} onChange={(event) => setForm({ ...form, status: event.target.value as Status })}><option value="ACTIVE">活跃</option><option value="INACTIVE">未激活</option></select></label></div>
+          <div className={styles.note}><Info size={17} /><p>停用账号后，用户将无法访问组织工作台。</p></div>
+          <div className={styles.actions}><button type="button" className={styles.secondaryButton} onClick={props.onClose}>取消</button><button disabled={props.isSaving} type="submit" className={styles.primaryButton}>{props.isSaving ? '保存中...' : props.user ? '保存修改' : '创建用户'}</button></div>
         </form>
       </aside>
     </div>
diff --git a/frontend/src/routes/user-management/components/UserProfilePanel/index.module.scss b/frontend/src/routes/user-management/components/UserProfilePanel/index.module.scss
new file mode 100644
index 0000000..2a5f8fc
--- /dev/null
+++ b/frontend/src/routes/user-management/components/UserProfilePanel/index.module.scss
@@ -0,0 +1,39 @@
+.panel {
+  min-width: 0;
+  padding: 26px 28px 28px;
+  border-left: 1px solid var(--page-rule);
+  background: var(--page-surface-2);
+}
+
+.panelTop { display: flex; align-items: center; justify-content: space-between; }
+.eyebrow { margin: 0; color: var(--page-muted); font-size: 10px; font-weight: 800; letter-spacing: .14em; }
+.iconButton { display: grid; width: 32px; height: 32px; place-items: center; padding: 0; border: 1px solid var(--page-rule); background: transparent; color: var(--page-muted); }
+.iconButton:hover { border-color: var(--page-accent); color: var(--page-accent); }
+.identity { display: grid; justify-items: start; gap: 8px; padding: 33px 0 25px; border-bottom: 1px solid var(--page-rule); }
+.avatar { display: grid; width: 66px; height: 66px; place-items: center; border: 1px solid var(--page-accent); border-radius: 50%; color: var(--page-accent); font-size: 16px; font-weight: 850; }
+.identity h2 { margin: 4px 0 0; color: var(--page-ink); font-size: 25px; letter-spacing: -.04em; }
+.identity p { overflow: hidden; width: 100%; margin: -2px 0 3px; color: var(--page-muted); font-size: 12px; text-overflow: ellipsis; white-space: nowrap; }
+.status { display: inline-flex; align-items: center; gap: 7px; color: var(--page-ink); font-size: 11px; font-weight: 750; }
+.status > span { width: 7px; height: 7px; border-radius: 50%; background: var(--page-accent); }
+.status.inactive > span { background: var(--page-muted); }
+.details { display: grid; gap: 0; margin: 0; padding: 9px 0; border-bottom: 1px solid var(--page-rule); }
+.details div { display: flex; justify-content: space-between; gap: 12px; padding: 11px 0; }
+.details dt { color: var(--page-muted); font-size: 11px; }
+.details dd { margin: 0; color: var(--page-ink); font-size: 11px; text-align: right; }
+.access { display: grid; gap: 14px; padding: 23px 0 26px; }
+.access .eyebrow { margin-bottom: 2px; }
+.access div { display: grid; grid-template-columns: 20px 1fr auto; align-items: center; gap: 4px; color: var(--page-ink); font-size: 11px; }
+.access svg { color: var(--page-accent); }
+.access small { color: var(--page-muted); font-size: 10px; }
+.actions { display: flex; }
+.outlineButton { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 42px; width: 100%; border: 1px solid var(--page-rule); background: transparent; color: var(--page-ink); font-size: 11px; font-weight: 750; }
+.outlineButton:hover { border-color: var(--page-accent); color: var(--page-accent); }
+.emptyProfile { display: grid; justify-items: center; gap: 9px; min-height: 370px; place-content: center; color: var(--page-muted); text-align: center; }
+.emptyProfile strong { color: var(--page-ink); font-size: 15px; }
+.emptyProfile span { max-width: 180px; font-size: 11px; line-height: 1.5; }
+.emptyProfile .outlineButton { width: auto; margin-top: 10px; padding: 0 13px; }
+
+@media (max-width: 760px) {
+  .panel { border-top: 1px solid var(--page-rule); border-left: 0; }
+  .identity { padding-top: 25px; }
+}
diff --git a/frontend/src/routes/user-management/components/UserProfilePanel/index.tsx b/frontend/src/routes/user-management/components/UserProfilePanel/index.tsx
new file mode 100644
index 0000000..28daa25
--- /dev/null
+++ b/frontend/src/routes/user-management/components/UserProfilePanel/index.tsx
@@ -0,0 +1,34 @@
+import { ArrowRight, CheckCircle2, MoreHorizontal, ShieldCheck, UserRound } from 'lucide-react'
+
+import { roleLabel, statusLabel } from '../../../../constants/user'
+import type { User } from '../../../../interfaces/user/model'
+import { formatDate, initials } from '../../../../utils/user'
+import styles from './index.module.scss'
+
+interface UserProfilePanelProps {
+  user: User | null
+  onEdit: (user: User) => void
+  onCreate: () => void
+}
+
+export default function UserProfilePanel({ user, onEdit, onCreate }: UserProfilePanelProps) {
+  if (!user) {
+    return (
+      <aside className={styles.panel} aria-label="成员档案">
+        <div className={styles.emptyProfile}><UserRound size={24} /><strong>选择一个成员</strong><span>从左侧列表选择成员，查看详细档案。</span><button type="button" className={styles.outlineButton} onClick={onCreate}>新增成员 <ArrowRight size={15} /></button></div>
+      </aside>
+    )
+  }
+
+  const isActive = user.status === 'ACTIVE'
+
+  return (
+    <aside className={styles.panel} aria-labelledby="profile-title">
+      <div className={styles.panelTop}><p className={styles.eyebrow}>MEMBER PROFILE</p><button className={styles.iconButton} type="button" title="更多操作" aria-label="成员更多操作"><MoreHorizontal size={18} /></button></div>
+      <div className={styles.identity}><span className={styles.avatar}>{initials(user.fullName)}</span><h2 id="profile-title">{user.fullName}</h2><p>{user.email}</p><span className={`${styles.status} ${isActive ? styles.active : styles.inactive}`}><span />{statusLabel(user.status)}</span></div>
+      <dl className={styles.details}><div><dt>角色</dt><dd>{roleLabel(user.role)}</dd></div><div><dt>加入时间</dt><dd>{formatDate(user.createdAt)}</dd></div><div><dt>最近更新</dt><dd>{formatDate(user.updatedAt)}</dd></div></dl>
+      <section className={styles.access} aria-labelledby="access-title"><p className={styles.eyebrow} id="access-title">ACCESS / 访问范围</p><div><CheckCircle2 size={16} /><span>组织工作台</span><small>{isActive ? '可访问' : '已暂停'}</small></div><div><CheckCircle2 size={16} /><span>成员目录</span><small>{roleLabel(user.role) === '管理员' ? '可管理' : '可查看'}</small></div><div><ShieldCheck size={16} /><span>管理权限</span><small>{roleLabel(user.role) === '管理员' ? '已授予' : '未授予'}</small></div></section>
+      <div className={styles.actions}><button type="button" className={styles.outlineButton} onClick={() => onEdit(user)}>编辑成员资料 <ArrowRight size={15} /></button></div>
+    </aside>
+  )
+}
diff --git a/frontend/src/routes/user-management/components/UserTable/index.module.scss b/frontend/src/routes/user-management/components/UserTable/index.module.scss
index 287be9e..21ad18f 100644
--- a/frontend/src/routes/user-management/components/UserTable/index.module.scss
+++ b/frontend/src/routes/user-management/components/UserTable/index.module.scss
@@ -1,3 +1,42 @@
-.root {
-  min-width: 0;
+.root { min-width: 0; overflow-x: auto; }
+.root table { width: 100%; min-width: 700px; border-collapse: collapse; }
+.root th, .root td { padding: 13px 12px; border-bottom: 1px solid var(--page-rule); text-align: left; }
+.root th { color: var(--page-muted); font-size: 9px; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
+.root td { color: var(--page-ink); font-size: 12px; }
+.root tbody tr { cursor: pointer; }
+.root tbody tr:hover, .root tbody .selectedRow { background: var(--page-surface-2); }
+.root tbody tr:focus-visible { outline: 2px solid var(--page-accent); outline-offset: -2px; }
+.root tbody tr:last-child td { border-bottom: 0; }
+.checkColumn { width: 40px; padding-right: 0 !important; padding-left: 0 !important; text-align: center !important; }
+.checkColumn input { width: 15px; height: 15px; accent-color: var(--page-accent); }
+.userCell { display: flex; align-items: center; gap: 10px; min-width: 205px; }
+.avatar { display: grid; width: 34px; height: 34px; flex: 0 0 auto; place-items: center; border: 1px solid var(--page-accent); border-radius: 50%; color: var(--page-accent); font-size: 10px; font-weight: 850; }
+.userCell strong, .userCell small { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+.userCell strong { color: var(--page-ink); font-size: 12px; }
+.userCell small { max-width: 180px; margin-top: 4px; color: var(--page-muted); font-size: 10px; }
+.roleLabel, .mutedCell { color: var(--page-muted); font-size: 11px; white-space: nowrap; }
+.statusLabel { display: inline-flex; align-items: center; gap: 6px; color: var(--page-ink); font-size: 10px; font-weight: 750; white-space: nowrap; }
+.statusDot { width: 6px; height: 6px; border-radius: 50%; background: var(--page-accent); }
+.statusLabel.inactive .statusDot { background: var(--page-muted); }
+.rowActions { display: flex; justify-content: end; gap: 3px; }
+.iconButton { display: grid; width: 30px; height: 30px; place-items: center; padding: 0; border: 1px solid transparent; background: transparent; color: var(--page-muted); }
+.iconButton:hover { border-color: var(--page-rule); background: var(--page-surface); color: var(--page-accent); }
+.dangerAction:hover { color: #b15a4c; }
+.srOnly { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
+
+@media (max-width: 760px) {
+  .root { overflow-x: visible; }
+  .root table, .root tbody { display: block; min-width: 0; }
+  .root thead { display: none; }
+  .root tbody { padding: 4px 0; }
+  .root tbody tr { display: grid; grid-template-columns: 28px minmax(0, 1fr) auto; gap: 0 8px; padding: 12px 0; border-bottom: 1px solid var(--page-rule); }
+  .root tbody td { display: flex; align-items: center; min-height: 25px; padding: 3px 0; border: 0; }
+  .root tbody td::before { width: 65px; flex: 0 0 65px; color: var(--page-muted); font-size: 9px; font-weight: 700; content: attr(data-label); }
+  .root tbody .checkColumn { grid-row: span 3; align-items: start; padding-top: 8px; }
+  .root tbody .checkColumn::before, .root tbody td[data-label="用户"]::before, .root tbody td[data-label="操作"]::before { display: none; }
+  .root tbody td[data-label="用户"] { grid-column: 2 / 4; }
+  .root tbody td[data-label="角色"], .root tbody td[data-label="状态"], .root tbody td[data-label="加入时间"], .root tbody td[data-label="最近更新"] { grid-column: 2 / 4; }
+  .root tbody td[data-label="操作"] { grid-column: 3; grid-row: 1; align-self: start; }
+  .userCell { min-width: 0; }
+  .userCell small { max-width: 190px; }
 }
diff --git a/frontend/src/routes/user-management/components/UserTable/index.tsx b/frontend/src/routes/user-management/components/UserTable/index.tsx
index b29e69e..e357c89 100644
--- a/frontend/src/routes/user-management/components/UserTable/index.tsx
+++ b/frontend/src/routes/user-management/components/UserTable/index.tsx
@@ -9,28 +9,30 @@ import styles from './index.module.scss'
 interface UserTableProps {
   users: User[]
   selectedIds: Set<number>
+  selectedUserId: number | null
   allSelected: boolean
   onToggleAll: () => void
   onToggleSelected: (id: number) => void
+  onSelect: (id: number) => void
   onEdit: (user: User) => void
   onDelete: (user: User) => void
 }
 
 export default function UserTable(props: UserTableProps) {
   return (
-    <div className={`table-scroll ${styles.root}`}>
+    <div className={styles.root}>
       <table>
-        <thead><tr><th className="check-column"><input type="checkbox" aria-label="选择全部用户" checked={props.allSelected} onChange={props.onToggleAll} /></th><th>用户</th><th>角色</th><th>状态</th><th>加入时间</th><th>最近更新</th><th><span className="sr-only">操作</span></th></tr></thead>
+        <thead><tr><th className={styles.checkColumn}><input type="checkbox" aria-label="选择全部用户" checked={props.allSelected} onChange={props.onToggleAll} /></th><th>用户</th><th>角色</th><th>状态</th><th>加入时间</th><th>最近更新</th><th><span className={styles.srOnly}>操作</span></th></tr></thead>
         <tbody>
           {props.users.map((user) => (
-            <tr key={user.id} className={classNames({ 'selected-row': props.selectedIds.has(user.id) })}>
-              <td className="check-column" data-label="选择"><input type="checkbox" aria-label={`选择${user.fullName}`} checked={props.selectedIds.has(user.id)} onChange={() => props.onToggleSelected(user.id)} /></td>
-              <td data-label="用户"><div className="user-cell"><span className="avatar">{initials(user.fullName)}</span><span><strong>{user.fullName}</strong><small>{user.email}</small></span></div></td>
-              <td data-label="角色"><span className="role-label">{roleLabel(user.role)}</span></td>
-              <td data-label="状态"><span className={`status-label ${user.status.toLowerCase()}`}><span className="status-mini-dot" />{statusLabel(user.status)}</span></td>
-              <td data-label="加入时间" className="muted-cell">{formatDate(user.createdAt)}</td>
-              <td data-label="最近更新" className="muted-cell">{formatDate(user.updatedAt)}</td>
-              <td data-label="操作"><div className="row-actions"><button className="icon-button" type="button" title="编辑用户" aria-label={`编辑${user.fullName}`} onClick={() => props.onEdit(user)}><Pencil size={16} /></button><button className="icon-button danger-action" type="button" title="删除用户" aria-label={`删除${user.fullName}`} onClick={() => props.onDelete(user)}><Trash2 size={16} /></button></div></td>
+            <tr key={user.id} className={classNames(styles.row, { [styles.selectedRow]: props.selectedUserId === user.id })} onClick={() => props.onSelect(user.id)} onKeyDown={(event) => { if (event.key === 'Enter' || event.key === ' ') { event.preventDefault(); props.onSelect(user.id) } }} tabIndex={0} aria-selected={props.selectedUserId === user.id}>
+              <td className={styles.checkColumn} data-label="选择"><input type="checkbox" aria-label={`选择${user.fullName}`} checked={props.selectedIds.has(user.id)} onClick={(event) => event.stopPropagation()} onChange={() => props.onToggleSelected(user.id)} /></td>
+              <td data-label="用户"><div className={styles.userCell}><span className={styles.avatar}>{initials(user.fullName)}</span><span><strong>{user.fullName}</strong><small>{user.email}</small></span></div></td>
+              <td data-label="角色"><span className={styles.roleLabel}>{roleLabel(user.role)}</span></td>
+              <td data-label="状态"><span className={`${styles.statusLabel} ${user.status === 'ACTIVE' ? styles.active : styles.inactive}`}><span className={styles.statusDot} />{statusLabel(user.status)}</span></td>
+              <td data-label="加入时间" className={styles.mutedCell}>{formatDate(user.createdAt)}</td>
+              <td data-label="最近更新" className={styles.mutedCell}>{formatDate(user.updatedAt)}</td>
+              <td data-label="操作"><div className={styles.rowActions}><button className={styles.iconButton} type="button" title="编辑用户" aria-label={`编辑${user.fullName}`} onClick={(event) => { event.stopPropagation(); props.onEdit(user) }}><Pencil size={16} /></button><button className={`${styles.iconButton} ${styles.dangerAction}`} type="button" title="删除用户" aria-label={`删除${user.fullName}`} onClick={(event) => { event.stopPropagation(); void props.onDelete(user) }}><Trash2 size={16} /></button></div></td>
             </tr>
           ))}
         </tbody>
diff --git a/frontend/src/routes/user-management/index.module.scss b/frontend/src/routes/user-management/index.module.scss
index 67a49e7..e63520a 100644
--- a/frontend/src/routes/user-management/index.module.scss
+++ b/frontend/src/routes/user-management/index.module.scss
@@ -1,3 +1,81 @@
 .page {
+  --page-paper: #e1e8eb;
+  --page-surface: #f8faf9;
+  --page-surface-2: #edf2f2;
+  --page-ink: #23373e;
+  --page-muted: #73878d;
+  --page-rule: #cbd8db;
+  --page-accent: #2b7680;
+  --page-accent-ink: #fff;
   min-height: 100vh;
+  overflow-x: clip;
+  background: var(--page-paper);
+  color: var(--page-ink);
+}
+
+.topbar { min-height: 72px; border-bottom: 1px solid var(--page-rule); background: var(--page-surface); }
+.topbarInner { display: flex; align-items: center; justify-content: space-between; width: min(1240px, 91vw); min-height: 72px; margin: 0 auto; }
+.brandLockup { display: flex; align-items: center; gap: 10px; }
+.brandMark { display: grid; width: 30px; height: 30px; place-items: center; background: var(--page-accent); color: var(--page-accent-ink); font-size: 12px; font-weight: 900; }
+.brandLockup > span:last-child { display: grid; gap: 3px; }
+.brandLockup strong { color: var(--page-ink); font-size: 13px; }
+.brandLockup small { color: var(--page-muted); font-size: 10px; }
+.topbarMeta { display: flex; align-items: center; gap: 9px; color: var(--page-muted); font-size: 11px; }
+.statusDot { width: 7px; height: 7px; border-radius: 50%; background: #43a276; }
+.topbarDivider { width: 1px; height: 14px; margin: 0 4px; background: var(--page-rule); }
+.content { width: min(1240px, 91vw); margin: 0 auto; padding: 32px 0 70px; }
+.breadcrumb { display: flex; align-items: center; gap: 8px; color: var(--page-muted); font-size: 11px; }
+.breadcrumb strong { color: var(--page-ink); font-weight: 750; }
+.pageHeading { display: flex; align-items: end; justify-content: space-between; gap: 24px; padding: 32px 0 28px; }
+.eyebrow { margin: 0 0 9px; color: var(--page-muted); font-size: 10px; font-weight: 800; letter-spacing: .14em; }
+.pageHeading h1 { margin: 0; color: var(--page-ink); font-family: Georgia, 'Times New Roman', serif; font-size: clamp(36px, 4.2vw, 55px); font-weight: 400; letter-spacing: -.06em; line-height: 1; }
+.pageSummary { margin: 12px 0 0; color: var(--page-muted); font-size: 13px; }
+.primaryButton { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 42px; padding: 0 16px; border: 1px solid var(--page-accent); background: var(--page-accent); color: var(--page-accent-ink); font-size: 12px; font-weight: 750; }
+.primaryButton:hover { filter: brightness(.95); }
+.workspace { display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(290px, .55fr); margin-top: 28px; border: 1px solid var(--page-rule); background: var(--page-surface); }
+.directoryPanel { min-width: 0; padding: 26px 28px 24px; }
+.panelHeading { display: flex; align-items: end; justify-content: space-between; gap: 16px; }
+.panelHeading .eyebrow { margin-bottom: 7px; }
+.panelHeading h2 { margin: 0; color: var(--page-ink); font-size: 20px; letter-spacing: -.04em; }
+.panelHeading > span { color: var(--page-muted); font-size: 11px; white-space: nowrap; }
+.tableFrame { min-height: 300px; }
+.bulkToolbar { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 45px; padding: 0 11px; background: var(--page-surface-2); color: var(--page-muted); font-size: 11px; }
+.bulkToolbar strong { color: var(--page-ink); }
+.bulkToolbar > div { display: flex; gap: 6px; }
+.bulkButton { min-height: 29px; padding: 0 9px; border: 1px solid var(--page-rule); background: var(--page-surface); color: var(--page-ink); font-size: 10px; font-weight: 700; }
+.bulkButton:hover:not(:disabled) { border-color: var(--page-accent); color: var(--page-accent); }
+.bulkButton:disabled { cursor: wait; opacity: .55; }
+.errorBanner { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: 14px 0 0; padding: 10px 11px; border: 1px solid #d7a39a; background: #fff5f2; color: #9d4639; font-size: 11px; }
+.errorBanner button { display: grid; width: 24px; height: 24px; place-items: center; padding: 0; border: 0; background: transparent; color: inherit; }
+.emptyState { display: flex; min-height: 300px; flex-direction: column; align-items: center; justify-content: center; gap: 8px; color: var(--page-muted); font-size: 11px; text-align: center; }
+.emptyState strong { color: var(--page-ink); font-size: 15px; }
+.emptyIcon { color: var(--page-accent); }
+.secondaryButton { min-height: 36px; margin-top: 7px; padding: 0 12px; border: 1px solid var(--page-rule); background: transparent; color: var(--page-ink); font-size: 11px; }
+.secondaryButton:hover { border-color: var(--page-accent); color: var(--page-accent); }
+.loadingRing { width: 20px; height: 20px; border: 2px solid var(--page-rule); border-top-color: var(--page-accent); border-radius: 50%; animation: spin .7s linear infinite; }
+.toast { position: fixed; right: 22px; bottom: 22px; z-index: 500; display: flex; align-items: center; gap: 8px; min-height: 42px; padding: 0 14px; border: 1px solid #b8d7c8; background: #f0faf4; color: #28724f; box-shadow: 0 10px 25px rgb(21 67 51 / 13%); font-size: 11px; font-weight: 700; }
+.toast > span { display: grid; width: 18px; height: 18px; place-items: center; border-radius: 50%; background: #41a275; color: #fff; }
+@keyframes spin { to { transform: rotate(360deg); } }
+
+@media (max-width: 960px) {
+  .workspace { grid-template-columns: minmax(0, 1fr) minmax(250px, .55fr); }
+  .directoryPanel { padding-inline: 20px; }
+}
+
+@media (max-width: 760px) {
+  .topbarInner, .content { width: 90vw; }
+  .topbar { min-height: 64px; }
+  .topbarInner { min-height: 64px; }
+  .topbarMeta { display: none; }
+  .content { padding-top: 24px; padding-bottom: 45px; }
+  .pageHeading { align-items: start; flex-direction: column; gap: 19px; padding-block: 25px 23px; }
+  .pageHeading .primaryButton { width: 100%; }
+  .workspace { grid-template-columns: 1fr; margin-top: 22px; }
+  .directoryPanel { padding: 20px 15px 18px; }
+  .panelHeading { align-items: start; flex-direction: column; gap: 7px; }
+  .panelHeading > span { align-self: end; }
+  .bulkToolbar { align-items: start; flex-direction: column; padding-block: 9px; }
+  .bulkToolbar > div { width: 100%; }
+  .bulkButton { flex: 1; }
+  .toast { right: 14px; bottom: 14px; left: 14px; justify-content: center; }
 }