diff --git a/frontend/app/features/admin/PermissionCheckboxList.tsx b/frontend/app/features/admin/PermissionCheckboxList.tsx
index bd5dbb1..1ae2c0b 100644
--- a/frontend/app/features/admin/PermissionCheckboxList.tsx
+++ b/frontend/app/features/admin/PermissionCheckboxList.tsx
@@ -1,6 +1,13 @@
 import type { PlatformPermission } from "../../services/api";
 
 import { Checkbox } from "~/components/ui/checkbox";
+import {
+  adminEmptyClass,
+  permissionGroupClass,
+  permissionGroupTitleClass,
+  permissionGroupsClass,
+  permissionItemClassName,
+} from "./adminUi";
 
 /** 模块编码 → 展示名（用于权限分组标题）。 */
 const MODULE_LABELS: Record<string, string> = {
@@ -10,7 +17,7 @@ const MODULE_LABELS: Record<string, string> = {
   system: "系统管理",
 };
 
-/** 勾选框样式：复刻原生 checkbox 外观（白底、灰边、蓝色勾选），并对齐 `.permission-item input` 的 3px 顶部偏移。 */
+/** 勾选框样式：复刻原生 checkbox 外观（白底、灰边、蓝色勾选），并对齐 permission item 的 3px 顶部偏移。 */
 const CHECKBOX_CLASS =
   "mt-[3px] size-[16px] rounded-[3px] border-[#cdd9e4] bg-white disabled:opacity-100 data-checked:border-[#1277d3] data-checked:bg-[#1277d3] data-checked:text-white";
 
@@ -41,16 +48,16 @@ export function PermissionCheckboxList({
   );
 
   if (permissions.length === 0) {
-    return <p className="admin-empty">暂无可用权限</p>;
+    return <p className={adminEmptyClass}>暂无可用权限</p>;
   }
 
   const isAdmin = targetRoleCode === "admin";
 
   return (
-    <div className="permission-groups">
+    <div className={permissionGroupsClass}>
       {Object.entries(groups).map(([module, items]) => (
-        <div className="permission-group" key={module}>
-          <div className="permission-group__title">
+        <div className={permissionGroupClass} key={module}>
+          <div className={permissionGroupTitleClass}>
             {MODULE_LABELS[module] ?? module}
           </div>
           {items.map((permission) => {
@@ -61,7 +68,7 @@ export function PermissionCheckboxList({
             const checked = selected.includes(code);
             return (
               <label
-                className={`permission-item${locked ? " is-locked" : ""}`}
+                className={permissionItemClassName(locked)}
                 key={code}
               >
                 <Checkbox
diff --git a/frontend/app/features/admin/PermissionEditDialog.tsx b/frontend/app/features/admin/PermissionEditDialog.tsx
index c4902d8..80e24d4 100644
--- a/frontend/app/features/admin/PermissionEditDialog.tsx
+++ b/frontend/app/features/admin/PermissionEditDialog.tsx
@@ -9,6 +9,7 @@ import {
 import { Button } from "~/components/ui/button";
 import { modalFormClass } from "../platform/modalUi";
 import { PermissionCheckboxList } from "./PermissionCheckboxList";
+import { roleErrorClass } from "./adminUi";
 
 export function PermissionEditDialog({
   open,
@@ -91,7 +92,7 @@ export function PermissionEditDialog({
     >
       <div className={modalFormClass}>
         {target?.role_code === "admin" && (
-          <p className="role-error">admin 角色必须保留 system:view 权限。</p>
+          <p className={roleErrorClass}>admin 角色必须保留 system:view 权限。</p>
         )}
         {target ? (
           <PermissionCheckboxList
diff --git a/frontend/app/features/admin/ProjectManagementPage.tsx b/frontend/app/features/admin/ProjectManagementPage.tsx
index 19c3eb3..547e6f8 100644
--- a/frontend/app/features/admin/ProjectManagementPage.tsx
+++ b/frontend/app/features/admin/ProjectManagementPage.tsx
@@ -17,8 +17,20 @@ import { AdminColgroup, USER_PROJECT_COL_WIDTHS } from "./AdminTable";
 import { ProjectEditDialog } from "./ProjectEditDialog";
 import { ImportMemberDialog } from "./ImportMemberDialog";
 import { ProjectMembersDrawer } from "./ProjectMembersDrawer";
-
-import "../../styles/admin.css";
+import {
+  adminEmptyClass,
+  adminPageClass,
+  adminReadonlyClass,
+  adminToolbarClass,
+  adminToolbarInputClass,
+  adminToolbarSearchClass,
+  employeeActionsClass,
+  employeeAvatarClass,
+  employeeNameClass,
+  rowButtonClass,
+  rowDangerButtonClass,
+  statusPillClass,
+} from "./adminUi";
 
 const EMPTY_PROJECT_FORM = {
   workspace_code: "",
@@ -242,14 +254,14 @@ export function ProjectManagementPage({
   };
 
   return (
-    <section className="admin-page">
-      <div className="admin-toolbar">
-        <div className="admin-toolbar__search">
+    <section className={adminPageClass}>
+      <div className={adminToolbarClass}>
+        <div className={adminToolbarSearchClass}>
           <Search size={14} />
           <input
             type="text"
             placeholder="请输入项目名称"
-            className="admin-toolbar__input"
+            className={adminToolbarInputClass}
             value={projectSearchTerm}
             onChange={(event) => setProjectSearchTerm(event.target.value)}
           />
@@ -267,7 +279,7 @@ export function ProjectManagementPage({
         </Button>
       </div>
 
-      {!canManage && <div className="admin-readonly">当前为开发人员，只能查看项目列表。</div>}
+      {!canManage && <div className={adminReadonlyClass}>当前为开发人员，只能查看项目列表。</div>}
       <Table className="rounded-[9px] border border-[#dfe7ef] overflow-hidden text-[11px] text-[#44576a] [--border-color:#dfe7ef] table-fixed bg-white">
         <AdminColgroup widths={USER_PROJECT_COL_WIDTHS} />
         <TableHeader className="bg-[#f5f8fb] text-[#748598]">
@@ -283,13 +295,13 @@ export function ProjectManagementPage({
           {projectLoading ? (
             <TableRow className="min-h-[64px] border-t border-[#edf1f5] hover:bg-[#f7fafc] data-[state=selected]:bg-transparent">
               <TableCell colSpan={5} className="p-0">
-                <p className="admin-empty">正在加载项目…</p>
+                <p className={adminEmptyClass}>正在加载项目…</p>
               </TableCell>
             </TableRow>
           ) : projects.length === 0 ? (
             <TableRow className="min-h-[64px] border-t border-[#edf1f5] hover:bg-[#f7fafc] data-[state=selected]:bg-transparent">
               <TableCell colSpan={5} className="p-0">
-                <p className="admin-empty">暂无项目</p>
+                <p className={adminEmptyClass}>暂无项目</p>
               </TableCell>
             </TableRow>
           ) : (
@@ -306,8 +318,8 @@ export function ProjectManagementPage({
               .map((project) => (
                 <TableRow key={project.workspace_id} className="min-h-[64px] border-t border-[#edf1f5] hover:bg-[#f7fafc] data-[state=selected]:bg-transparent">
                   <TableCell className="p-3 px-4 align-middle">
-                    <span className="employee-name">
-                      <b className="avatar">{project.workspace_name.slice(0, 1)}</b>
+                    <span className={employeeNameClass}>
+                      <b className={employeeAvatarClass}>{project.workspace_name.slice(0, 1)}</b>
                       <span>
                         <strong>{project.workspace_name}</strong>
                         <small>{project.description ?? "无描述"}</small>
@@ -317,26 +329,45 @@ export function ProjectManagementPage({
                   <TableCell className="p-3 px-4 align-middle"><code>{project.workspace_code}</code></TableCell>
                   <TableCell className="p-3 px-4 align-middle">
                     <span>
-                      <span className={`status-pill is-${project.status}`}>
+                      <span className={statusPillClass(project.status)}>
                         {project.status === "active" ? "正常" : project.status === "archived" ? "已归档" : "已删除"}
                       </span>
                     </span>
                   </TableCell>
                   <TableCell className="p-3 px-4 align-middle"><span>{project.quota_bytes > 0 ? `${(project.quota_bytes / 1024 / 1024 / 1024).toFixed(1)} GB` : "无限制"}</span></TableCell>
                   <TableCell className="p-3 px-4 align-middle">
-                    <span className="employee-actions">
-                      <button type="button" disabled={!canManage} onClick={() => openMembersDrawer(project)}>成员</button>
-                      <button type="button" disabled={!canManage} onClick={() => openEditProject(project)}>编辑</button>
-                      {/* <button type="button" disabled={!canManage} onClick={() => openImportMemberDialog(project)}>导入成员</button> */}
-                      <button
+                    <span className={employeeActionsClass}>
+                      <Button
+                        variant="outline"
+                        size="xs"
+                        type="button"
+                        disabled={!canManage}
+                        onClick={() => openMembersDrawer(project)}
+                        className={rowButtonClass}
+                      >
+                        成员
+                      </Button>
+                      <Button
+                        variant="outline"
+                        size="xs"
+                        type="button"
+                        disabled={!canManage}
+                        onClick={() => openEditProject(project)}
+                        className={rowButtonClass}
+                      >
+                        编辑
+                      </Button>
+                      <Button
+                        variant="destructive"
+                        size="xs"
                         type="button"
-                        className="is-danger"
                         disabled={!canManage || project.status === "disabled"}
                         title={project.status === "disabled" ? "已删除的项目不能操作" : "删除项目"}
                         onClick={() => setDeleteTarget(project)}
+                        className={rowDangerButtonClass}
                       >
                         删除
-                      </button>
+                      </Button>
                     </span>
                   </TableCell>
                 </TableRow>
diff --git a/frontend/app/features/admin/RoleEditDialog.tsx b/frontend/app/features/admin/RoleEditDialog.tsx
index 0aa62b1..5ed57b3 100644
--- a/frontend/app/features/admin/RoleEditDialog.tsx
+++ b/frontend/app/features/admin/RoleEditDialog.tsx
@@ -19,6 +19,12 @@ import {
   modalFormClass,
 } from "../platform/modalUi";
 import { PermissionCheckboxList } from "./PermissionCheckboxList";
+import {
+  formHintClass,
+  permissionGroupTitleClass,
+  permissionGroupsClass,
+  roleErrorClass,
+} from "./adminUi";
 
 const RESERVED_ROLE_CODES = new Set(["admin", "developer"]);
 const ROLE_CODE_PATTERN = /^[a-z][a-z0-9_-]{1,63}$/;
@@ -153,7 +159,7 @@ export function RoleEditDialog({
       eyebrow="ROLE"
       title={editing ? "编辑角色" : "新建角色"}
     >
-      <form className={`${modalFormClass} role-create-form`} onSubmit={(event) => void handleSubmit(event)}>
+      <form className={modalFormClass} onSubmit={(event) => void handleSubmit(event)}>
         {editing ? (
           <label className={formFieldClass}>
             <span>角色编码</span>
@@ -169,10 +175,10 @@ export function RoleEditDialog({
               onChange={handleRoleCodeChange}
               placeholder="例如：qa_engineer"
             />
-            <span className="form-hint">
+            <span className={formHintClass}>
               以小写字母开头，仅含小写字母/数字/下划线/连字符（2~64 字符）
             </span>
-            {roleCodeError && <span className="role-error">{roleCodeError}</span>}
+            {roleCodeError && <span className={roleErrorClass}>{roleCodeError}</span>}
           </label>
         )}
         <label className={formFieldClass}>
@@ -185,7 +191,7 @@ export function RoleEditDialog({
             placeholder="请输入角色名称"
           />
           {editing !== null && editing.is_builtin && (
-            <span className="form-hint">内置角色名称不可修改，描述可编辑</span>
+            <span className={formHintClass}>内置角色名称不可修改，描述可编辑</span>
           )}
         </label>
         <label className={formFieldClass}>
@@ -198,8 +204,8 @@ export function RoleEditDialog({
           />
         </label>
         {!editing && (
-          <div className="permission-groups">
-            <div className="permission-group__title">初始权限</div>
+          <div className={permissionGroupsClass}>
+            <div className={permissionGroupTitleClass}>初始权限</div>
             <PermissionCheckboxList
               permissions={permissions}
               selected={form.permission_codes}
diff --git a/frontend/app/features/admin/RoleManagementPage.tsx b/frontend/app/features/admin/RoleManagementPage.tsx
index 58c1a4a..89ada69 100644
--- a/frontend/app/features/admin/RoleManagementPage.tsx
+++ b/frontend/app/features/admin/RoleManagementPage.tsx
@@ -22,8 +22,21 @@ import {
   TableRow,
 } from "~/components/ui/table";
 import { AdminColgroup, ROLE_COL_WIDTHS } from "./AdminTable";
-
-import "../../styles/admin.css";
+import {
+  adminEmptyClass,
+  adminPageClass,
+  adminReadonlyClass,
+  adminToolbarClass,
+  adminToolbarInputClass,
+  adminToolbarSearchClass,
+  builtinBadgeClass,
+  permissionCountClass,
+  roleActionsClass,
+  roleCodeClass,
+  roleNameClass,
+  rowButtonClass,
+  rowDangerButtonClass,
+} from "./adminUi";
 
 const PRIMARY_BUTTON_CLASS =
   "h-[37px] gap-[7px] rounded-md border border-[#126ac3] bg-gradient-to-br from-[#1881e7] to-[#1268c9] px-[15px] text-xs font-[650] text-white shadow-[0_6px_15px_rgb(20_111_202/18%)] enabled:hover:from-[#1175d8] enabled:hover:to-[#0e5bad]";
@@ -177,14 +190,14 @@ export function RoleManagementPage({
   });
 
   return (
-    <section className="admin-page">
-      <div className="admin-toolbar">
-        <div className="admin-toolbar__search">
+    <section className={adminPageClass}>
+      <div className={adminToolbarClass}>
+        <div className={adminToolbarSearchClass}>
           <Search size={14} />
           <input
             type="text"
             placeholder="搜索角色编码 / 名称"
-            className="admin-toolbar__input"
+            className={adminToolbarInputClass}
             value={searchTerm}
             onChange={(event) => setSearchTerm(event.target.value)}
           />
@@ -203,9 +216,9 @@ export function RoleManagementPage({
       </div>
 
       {!canManage && (
-        <div className="admin-readonly">当前为开发人员，只能查看角色列表。</div>
+        <div className={adminReadonlyClass}>当前为开发人员，只能查看角色列表。</div>
       )}
-      {loadError && <div className="admin-readonly">{loadError}</div>}
+      {loadError && <div className={adminReadonlyClass}>{loadError}</div>}
 
       <Table className="rounded-[9px] border border-[#dfe7ef] overflow-hidden text-[11px] text-[#44576a] [--border-color:#dfe7ef] table-fixed bg-white">
         <AdminColgroup widths={ROLE_COL_WIDTHS} />
@@ -222,13 +235,13 @@ export function RoleManagementPage({
           {loading ? (
             <TableRow className="min-h-[60px] border-t border-[#edf1f5] hover:bg-[#f7fafc] data-[state=selected]:bg-transparent">
               <TableCell colSpan={5} className="p-0">
-                <p className="admin-empty">正在加载角色…</p>
+                <p className={adminEmptyClass}>正在加载角色…</p>
               </TableCell>
             </TableRow>
           ) : filteredRoles.length === 0 ? (
             <TableRow className="min-h-[60px] border-t border-[#edf1f5] hover:bg-[#f7fafc] data-[state=selected]:bg-transparent">
               <TableCell colSpan={5} className="p-0">
-                <p className="admin-empty">
+                <p className={adminEmptyClass}>
                   {roles.length === 0 ? "暂无角色" : "没有匹配的角色"}
                 </p>
               </TableCell>
@@ -236,22 +249,22 @@ export function RoleManagementPage({
           ) : (
             filteredRoles.map((role) => (
               <TableRow key={role.role_id} className="min-h-[60px] border-t border-[#edf1f5] hover:bg-[#f7fafc] data-[state=selected]:bg-transparent">
-                <TableCell className="p-3 px-4 align-middle"><code className="role-code">{role.role_code}</code></TableCell>
-                <TableCell className="p-3 px-4 align-middle"><span className="role-name">{role.role_name}</span></TableCell>
-                <TableCell className="p-3 px-4 align-middle"><span className={`builtin-badge${role.is_builtin ? "" : " is-custom"}`}>
+                <TableCell className="p-3 px-4 align-middle"><code className={roleCodeClass}>{role.role_code}</code></TableCell>
+                <TableCell className="p-3 px-4 align-middle"><span className={roleNameClass}>{role.role_name}</span></TableCell>
+                <TableCell className="p-3 px-4 align-middle"><span className={builtinBadgeClass(role.is_builtin)}>
                   {role.is_builtin ? "内置" : "自定义"}
                 </span></TableCell>
-                <TableCell className="p-3 px-4 align-middle"><span className="permission-count">
+                <TableCell className="p-3 px-4 align-middle"><span className={permissionCountClass}>
                   {role.permission_codes.length} 项权限
                 </span></TableCell>
-                <TableCell className="p-3 px-4 align-middle"><span className="role-actions">
+                <TableCell className="p-3 px-4 align-middle"><span className={roleActionsClass}>
                   <Button
                     variant="outline"
                     size="xs"
                     type="button"
                     disabled={!canManage}
                     onClick={() => openEdit(role)}
-                    className="h-6 gap-1 rounded-[4px] border-[#d9e3ec] bg-white px-[9px] text-[11px] text-[#4c6c88] hover:bg-[#f7fafc] disabled:cursor-not-allowed disabled:opacity-[0.45]"
+                    className={rowButtonClass}
                   >
                     编辑
                   </Button>
@@ -261,7 +274,7 @@ export function RoleManagementPage({
                     type="button"
                     disabled={!canManage}
                     onClick={() => openPermissions(role)}
-                    className="h-6 gap-1 rounded-[4px] border-[#d9e3ec] bg-white px-[9px] text-[11px] text-[#4c6c88] hover:bg-[#f7fafc] disabled:cursor-not-allowed disabled:opacity-[0.45]"
+                    className={rowButtonClass}
                   >
                     权限
                   </Button>
@@ -272,7 +285,7 @@ export function RoleManagementPage({
                     disabled={!canManage || role.is_builtin}
                     title={role.is_builtin ? "内置角色不可删除" : "删除角色"}
                     onClick={() => setDeleteTarget(role)}
-                    className="h-6 gap-1 rounded-[4px] border-red-200 bg-white px-[9px] text-[11px] text-red-700 hover:bg-red-50 disabled:cursor-not-allowed disabled:opacity-[0.45]"
+                    className={rowDangerButtonClass}
                   >
                     删除
                   </Button>
diff --git a/frontend/app/features/admin/UserManagementPage.tsx b/frontend/app/features/admin/UserManagementPage.tsx
index 30e84df..daf756b 100644
--- a/frontend/app/features/admin/UserManagementPage.tsx
+++ b/frontend/app/features/admin/UserManagementPage.tsx
@@ -25,8 +25,21 @@ import {
   formInputClass,
   modalFormClass,
 } from "../platform/modalUi";
-
-import "../../styles/admin.css";
+import {
+  adminEmptyClass,
+  adminPageClass,
+  adminReadonlyClass,
+  adminToolbarClass,
+  adminToolbarInputClass,
+  adminToolbarSearchClass,
+  employeeActionsClass,
+  employeeAvatarClass,
+  employeeNameClass,
+  rolePillClass,
+  rowButtonClass,
+  rowDangerButtonClass,
+  statusPillClass,
+} from "./adminUi";
 
 const EMPTY_FORM = {
   username: "",
@@ -41,11 +54,6 @@ const PRIMARY_BUTTON_CLASS =
   "h-[37px] gap-[7px] rounded-md border border-[#126ac3] bg-gradient-to-br from-[#1881e7] to-[#1268c9] px-[15px] text-xs font-[650] text-white shadow-[0_6px_15px_rgb(20_111_202/18%)] enabled:hover:from-[#1175d8] enabled:hover:to-[#0e5bad]";
 const FORM_INPUT_CLASS =
   "h-[39px] w-full rounded-md border border-[#d6e0e9] bg-white px-[11px] text-xs text-[#283a4e] outline-none focus:border-[#5b9ddb] focus:shadow-[0_0_0_3px_rgb(38_125_207/8%)] disabled:cursor-not-allowed disabled:opacity-50";
-const ROW_BUTTON_CLASS =
-  "h-6 gap-1 rounded-[4px] border-[#d9e3ec] bg-white px-[9px] text-[11px] text-[#4c6c88] hover:bg-[#f7fafc] disabled:cursor-not-allowed disabled:opacity-[0.45]";
-const ROW_DANGER_BUTTON_CLASS =
-  "h-6 gap-1 rounded-[4px] border-[#d9e3ec] bg-white px-[9px] text-[11px] text-[#c14a4a] hover:bg-[#fdf2f2] disabled:cursor-not-allowed disabled:opacity-[0.45]";
-
 export function UserManagementPage({
   onNotify,
   onConnectionChange,
@@ -190,14 +198,14 @@ export function UserManagementPage({
   };
 
   return (
-    <section className="admin-page">
-      <div className="admin-toolbar">
-        <div className="admin-toolbar__search">
+    <section className={adminPageClass}>
+      <div className={adminToolbarClass}>
+        <div className={adminToolbarSearchClass}>
           <Search size={14} />
           <input
             type="text"
             placeholder="请输入用户名"
-            className="admin-toolbar__input"
+            className={adminToolbarInputClass}
             value={userSearchTerm}
             onChange={(event) => setUserSearchTerm(event.target.value)}
           />
@@ -215,7 +223,7 @@ export function UserManagementPage({
         </Button>
       </div>
 
-      {!canManage && <div className="admin-readonly">当前为开发人员，只能查看用户列表。</div>}
+      {!canManage && <div className={adminReadonlyClass}>当前为开发人员，只能查看用户列表。</div>}
       <Table className="rounded-[9px] border border-[#dfe7ef] overflow-hidden text-[11px] text-[#44576a] [--border-color:#dfe7ef] table-fixed bg-white">
         <AdminColgroup widths={USER_PROJECT_COL_WIDTHS} />
         <TableHeader className="bg-[#f5f8fb] text-[#748598]">
@@ -231,7 +239,7 @@ export function UserManagementPage({
           {loading ? (
             <TableRow className="min-h-[64px] border-t border-[#edf1f5] hover:bg-[#f7fafc] data-[state=selected]:bg-transparent">
               <TableCell colSpan={5} className="p-0">
-                <p className="admin-empty">正在加载用户…</p>
+                <p className={adminEmptyClass}>正在加载用户…</p>
               </TableCell>
             </TableRow>
           ) : (
@@ -249,18 +257,18 @@ export function UserManagementPage({
                 const isProtectedAdmin = employee.role_code === "admin";
                 return (
                   <TableRow key={employee.user_id} className="min-h-[64px] border-t border-[#edf1f5] hover:bg-[#f7fafc] data-[state=selected]:bg-transparent">
-                    <TableCell className="p-3 px-4 align-middle"><span className="employee-name"><b className="avatar">{employee.display_name.slice(0, 1)}</b><span><strong>{employee.display_name}</strong><small>{employee.email ?? "未设置邮箱"}</small></span></span></TableCell>
+                    <TableCell className="p-3 px-4 align-middle"><span className={employeeNameClass}><b className={employeeAvatarClass}>{employee.display_name.slice(0, 1)}</b><span><strong>{employee.display_name}</strong><small>{employee.email ?? "未设置邮箱"}</small></span></span></TableCell>
                     <TableCell className="p-3 px-4 align-middle"><code>{employee.username}</code></TableCell>
-                    <TableCell className="p-3 px-4 align-middle">{employee.role_code ? (<span className={`role-pill is-${employee.role_code}`}>{employee.role_name}</span>) : (<span>-</span>)}</TableCell>
-                    <TableCell className="p-3 px-4 align-middle"><span className={`status-pill is-${employee.status}`}>{employee.status === "active" ? "正常" : employee.status === "disabled" ? "已停用" : "已锁定"}</span></TableCell>
-                    <TableCell className="p-3 px-4 align-middle"><span className="employee-actions">
+                    <TableCell className="p-3 px-4 align-middle">{employee.role_code ? (<span className={rolePillClass(employee.role_code)}>{employee.role_name}</span>) : (<span>-</span>)}</TableCell>
+                    <TableCell className="p-3 px-4 align-middle"><span className={statusPillClass(employee.status)}>{employee.status === "active" ? "正常" : employee.status === "disabled" ? "已停用" : "已锁定"}</span></TableCell>
+                    <TableCell className="p-3 px-4 align-middle"><span className={employeeActionsClass}>
                       <Button
                         variant="outline"
                         size="xs"
                         type="button"
                         disabled={!canManage}
                         onClick={() => openEdit(employee)}
-                        className={ROW_BUTTON_CLASS}
+                        className={rowButtonClass}
                       >
                         编辑
                       </Button>
@@ -271,7 +279,7 @@ export function UserManagementPage({
                         disabled={!canManage || isProtectedAdmin}
                         title={isProtectedAdmin ? "管理员账号不能删除" : "删除"}
                         onClick={() => setDeleteTarget(employee)}
-                        className={ROW_DANGER_BUTTON_CLASS}
+                        className={rowDangerButtonClass}
                       >
                         删除
                       </Button>
diff --git a/frontend/app/features/admin/UserMultiSelect.tsx b/frontend/app/features/admin/UserMultiSelect.tsx
index 6ecd606..3fc139c 100644
--- a/frontend/app/features/admin/UserMultiSelect.tsx
+++ b/frontend/app/features/admin/UserMultiSelect.tsx
@@ -1,6 +1,7 @@
 import { useEffect, useState, useRef } from "react";
 
 import { type Employee } from "../../services/api";
+import { adminToolbarInputClass } from "./adminUi";
 
 // 多选用户下拉框组件 - 带 tag 显示
 export function UserMultiSelect({
@@ -47,7 +48,7 @@ export function UserMultiSelect({
     <div ref={containerRef} style={{ position: "relative" }}>
       {/* 选择框 - 显示 tag */}
       <div
-        className="admin-toolbar__input"
+        className={adminToolbarInputClass}
         onClick={() => setIsOpen(!isOpen)}
         style={{
           display: "flex",
diff --git a/frontend/app/features/admin/adminUi.ts b/frontend/app/features/admin/adminUi.ts
new file mode 100644
index 0000000..10ea83f
--- /dev/null
+++ b/frontend/app/features/admin/adminUi.ts
@@ -0,0 +1,89 @@
+import { cn } from "~/lib/utils";
+
+/** Shared Tailwind class strings for admin management pages. */
+
+export const adminPageClass = "h-full overflow-auto bg-[#f3f6f9] p-6";
+
+export const adminToolbarClass =
+  "mb-3.5 flex items-center justify-between rounded-lg border border-[#dfe7ef] bg-white px-3.5 py-3";
+
+export const adminToolbarSearchClass =
+  "flex w-[280px] items-center gap-2 rounded-md border border-[#d9e2eb] bg-[#f8fafb] px-3 py-2 [&_svg]:text-[#8a99a8]";
+
+export const adminToolbarInputClass =
+  "w-full border-none bg-transparent text-xs text-[#20364c] outline-none placeholder:text-[#a0b0bf]";
+
+export const adminReadonlyClass =
+  "mb-3 rounded-md border border-[#f1d79c] bg-[#fff8e8] px-3.5 py-2.5 text-[11px] text-[#8a6416]";
+
+export const adminEmptyClass = "p-[25px] text-center text-[#8796a6]";
+
+export const employeeNameClass =
+  "flex items-center gap-2.5 [&_small]:mt-[3px] [&_small]:text-[#93a0ae] [&_strong]:text-[#23384e] [&>span]:flex [&>span]:min-w-0 [&>span]:flex-col";
+
+export const employeeAvatarClass =
+  "grid size-8 place-items-center rounded-full bg-gradient-to-br from-[#3b92ed] to-[#1869c9] text-sm font-bold text-white";
+
+export const employeeActionsClass = "flex gap-1.5";
+
+export const roleActionsClass = "flex gap-1.5";
+
+export const rowButtonClass =
+  "h-6 gap-1 rounded-[4px] border-[#d9e3ec] bg-white px-[9px] text-[11px] text-[#4c6c88] hover:bg-[#f7fafc] disabled:cursor-not-allowed disabled:opacity-[0.45]";
+
+export const rowDangerButtonClass =
+  "h-6 gap-1 rounded-[4px] border-[#d9e3ec] bg-white px-[9px] text-[11px] text-[#c14a4a] hover:bg-[#fdf2f2] disabled:cursor-not-allowed disabled:opacity-[0.45]";
+
+export const roleCodeClass = "font-mono text-[11px] text-[#60758b]";
+
+export const roleNameClass = "font-semibold text-[#23384e]";
+
+export const permissionCountClass = "text-[#5d7488]";
+
+export const formHintClass =
+  "mt-1.5 block text-[10px] font-normal leading-normal text-[#98a5b3]";
+
+export const roleErrorClass = "mt-1.5 text-[10px] font-medium text-[#c0392b]";
+
+export const permissionGroupsClass = "flex flex-col gap-3.5";
+
+export const permissionGroupClass =
+  "rounded-[7px] border border-[#e3eaf1] bg-[#fafbfc] px-3 py-2.5";
+
+export const permissionGroupTitleClass =
+  "mb-2 text-[10px] font-bold tracking-wide text-[#2e86de]";
+
+export const permissionItemClass =
+  "flex cursor-pointer items-start gap-[9px] rounded-md px-2 py-[7px] hover:bg-[#f0f6fc] [&_small]:mt-0.5 [&_small]:text-[10px] [&_small]:text-[#8a99a8] [&_span]:flex [&_span]:min-w-0 [&_span]:flex-col [&_strong]:text-[11px] [&_strong]:text-[#33475c]";
+
+export const permissionItemLockedClass =
+  "cursor-not-allowed bg-[#f1f3f5] opacity-80 hover:bg-[#f1f3f5]";
+
+export function rolePillClass(roleCode: string): string {
+  return cn(
+    "w-max rounded-xl px-2 py-1",
+    roleCode === "admin"
+      ? "bg-[#fff2d6] text-[#87580f]"
+      : "bg-[#eaf4ff] text-[#1d6ab3]",
+  );
+}
+
+export function statusPillClass(status: string): string {
+  return cn(
+    "w-max rounded-xl px-2 py-1",
+    status === "disabled" || status === "locked"
+      ? "bg-[#ffeded] text-[#a64b4b]"
+      : "bg-[#e8f8f1] text-[#138657]",
+  );
+}
+
+export function builtinBadgeClass(isBuiltin: boolean): string {
+  return cn(
+    "w-max rounded-xl px-2 py-1 text-[10px]",
+    isBuiltin ? "bg-[#fff2d6] text-[#87580f]" : "bg-[#eaf4ff] text-[#1d6ab3]",
+  );
+}
+
+export function permissionItemClassName(locked: boolean): string {
+  return cn(permissionItemClass, locked && permissionItemLockedClass);
+}
diff --git a/frontend/app/styles/admin.css b/frontend/app/styles/admin.css
deleted file mode 100644
index 8e3da11..0000000
--- a/frontend/app/styles/admin.css
+++ /dev/null
@@ -1,6 +0,0 @@
-.admin-page{height:100%;padding:24px;overflow:auto;background:#f3f6f9}.admin-page__header{display:flex;align-items:center;justify-content:space-between;margin-bottom:15px;padding:20px 22px;border:1px solid #dee7ef;border-radius:9px;background:#fff}.admin-page__header span{color:#1978d4;font-size:10px;font-weight:800}.admin-page__header h2{margin:4px 0;color:#20364c}.admin-page__header p{margin:0;color:#8a99a8;font-size:11px}.admin-readonly{margin-bottom:12px;padding:10px 13px;border:1px solid #f1d79c;border-radius:6px;color:#8a6416;background:#fff8e8;font-size:11px}.employee-name{display:flex;align-items:center;gap:10px}.employee-name .avatar{display:grid;width:32px;height:32px;place-items:center}.employee-name>span{display:flex;min-width:0;flex-direction:column}.employee-name strong{color:#23384e}.employee-name small{margin-top:3px;color:#93a0ae}.role-pill,.status-pill{width:max-content;padding:4px 8px;border-radius:12px}.role-pill{color:#1d6ab3;background:#eaf4ff}.role-pill.is-admin{color:#87580f;background:#fff2d6}.status-pill{color:#138657;background:#e8f8f1}.status-pill.is-disabled,.status-pill.is-locked{color:#a64b4b;background:#ffeded}.employee-actions{display:flex;gap:6px}.employee-actions button{padding:5px 9px;border:1px solid #d9e3ec;border-radius:4px;color:#4c6c88;background:#fff;cursor:pointer}.employee-actions button.is-danger{color:#c14a4a}.employee-actions button:disabled{cursor:not-allowed;opacity:.45}.admin-empty{padding:25px;text-align:center;color:#8796a6}
-
-.admin-tabs{display:flex;gap:10px;margin-bottom:16px}.admin-tab{display:flex;align-items:center;gap:7px;height:42px;padding:0 16px;border:1px solid #d9e2eb;border-radius:8px;color:#54687e;background:#fff;cursor:pointer;font-size:12px;font-weight:600;transition:all .15s ease}.admin-tab:hover{border-color:#b8c9d9;background:#f7fafc}.admin-tab.is-active{border-color:#2e86de;color:#fff;background:linear-gradient(135deg,#2e86de,#1978d4);box-shadow:0 6px 18px rgb(28 119 222/22%)}.admin-toolbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px;padding:12px 14px;border:1px solid #dfe7ef;border-radius:8px;background:#fff}.admin-toolbar__search{display:flex;align-items:center;gap:8px;padding:8px 12px;border:1px solid #d9e2eb;border-radius:6px;background:#f8fafb;width:280px}.admin-toolbar__search svg{color:#8a99a8}.admin-toolbar__input{border:none;outline:none;background:transparent;color:#20364c;font-size:12px;width:100%}.admin-toolbar__input::placeholder{color:#a0b0bf}.admin-toolbar__button{display:flex;align-items:center;gap:6px;height:36px;padding:0 14px;border:none;border-radius:6px;color:#fff;background:linear-gradient(135deg,#2e86de,#1978d4);cursor:pointer;font-size:12px;font-weight:600;box-shadow:0 4px 12px rgb(28 119 222/18%)}.admin-toolbar__button:disabled{cursor:not-allowed;opacity:.5}.project-list-placeholder{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:400px;border:1px solid #e0e7ee;border-radius:9px;background:#fff;color:#7a8fa3;text-align:center}.project-list-placeholder svg{margin-bottom:16px;opacity:.6}.project-list-placeholder h3{margin:12px 0 6px;color:#34475d;font-size:16px}.project-list-placeholder p{margin:0;font-size:12px}.form-field .required{color:#e53935;margin-left:4px;font-size:12px}
-
-
-.role-code{color:#60758b;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:11px}.role-name{color:#23384e;font-weight:600}.builtin-badge{width:max-content;padding:4px 8px;border-radius:12px;color:#87580f;background:#fff2d6;font-size:10px}.builtin-badge.is-custom{color:#1d6ab3;background:#eaf4ff}.permission-count{color:#5d7488}.role-actions{display:flex;gap:6px}.role-actions button{padding:5px 9px;border:1px solid #d9e3ec;border-radius:4px;color:#4c6c88;background:#fff;cursor:pointer}.role-actions button.is-danger{color:#c14a4a}.role-actions button:disabled{cursor:not-allowed;opacity:.45}.permission-groups{display:flex;flex-direction:column;gap:14px}.permission-groups>.permission-group__title{color:#2e86de;font-size:10px;font-weight:700}.permission-group{border:1px solid #e3eaf1;border-radius:7px;background:#fafbfc;padding:10px 12px}.permission-group__title{margin-bottom:8px;color:#2e86de;font-size:10px;font-weight:700;letter-spacing:.04em}.permission-item{display:flex;align-items:flex-start;gap:9px;padding:7px 8px;border-radius:6px;cursor:pointer}.permission-item:hover{background:#f0f6fc}.permission-item input{margin-top:3px}.permission-item span{display:flex;flex-direction:column;min-width:0}.permission-item strong{color:#33475c;font-size:11px}.permission-item small{color:#8a99a8;font-size:10px;margin-top:2px}.permission-item.is-locked{background:#f1f3f5;cursor:not-allowed;opacity:.8}.role-create-form .form-hint{display:block;margin-top:6px;color:#98a5b3;font-size:10px;font-weight:400;line-height:1.5}.role-error{margin-top:6px;color:#c0392b;font-size:10px;font-weight:500}