diff --git a/cloud_backend/routers/manager_auth.py b/cloud_backend/routers/manager_auth.py
index e267a9d..435c77c 100644
--- a/cloud_backend/routers/manager_auth.py
+++ b/cloud_backend/routers/manager_auth.py
@@ -1,13 +1,15 @@
 from datetime import datetime, timedelta, timezone
+from typing import Optional
 from fastapi import APIRouter, Depends, HTTPException, status
 from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
 from jose import jwt, JWTError
 from passlib.context import CryptContext
+from pydantic import BaseModel
 from sqlalchemy.orm import Session
 
 from config import settings
 from database import get_db
-from models.manager_account import ManagerAccount
+from models.manager_account import ManagerAccount, manager_site_access
 from models.site import Site
 from auth_utils import get_current_admin
 from schemas.manager import (
@@ -56,10 +58,18 @@ def register_manager(
     db: Session = Depends(get_db),
     _admin=Depends(get_current_admin),
 ):
-    if db.query(ManagerAccount).filter(ManagerAccount.email == body.email).first():
-        raise HTTPException(status_code=status.HTTP_409_CONFLICT, detail="Email already registered")
-
+    existing = db.query(ManagerAccount).filter(ManagerAccount.email == body.email).first()
     sites = db.query(Site).filter(Site.id.in_(body.site_ids)).all()
+
+    if existing:
+        # Email already exists — just add the new site access links, don't recreate the account
+        for site in sites:
+            if site not in existing.sites:
+                existing.sites.append(site)
+        db.commit()
+        db.refresh(existing)
+        return existing
+
     manager = ManagerAccount(
         email=body.email,
         password_hash=_pwd.hash(body.password),
@@ -89,3 +99,52 @@ def login_manager(body: ManagerLoginRequest, db: Session = Depends(get_db)):
 @router.post("/refresh", response_model=ManagerTokenOut)
 def refresh_manager_token(manager: ManagerAccount = Depends(_get_current_manager)):
     return ManagerTokenOut(access_token=_create_manager_token(manager))
+
+
+# ── Admin-only: list managers for a site ─────────────────────────────────────
+
+class ManagerBySiteOut(BaseModel):
+    id: int
+    email: str
+    full_name: Optional[str] = None
+    is_active: int
+
+    model_config = {"from_attributes": True}
+
+
+@router.get("/by-site/{site_id}", response_model=list[ManagerBySiteOut])
+def get_managers_by_site(
+    site_id: int,
+    db: Session = Depends(get_db),
+    _admin=Depends(get_current_admin),
+):
+    site = db.query(Site).filter(Site.id == site_id).first()
+    if not site:
+        raise HTTPException(status_code=404, detail="Site not found")
+    return site.manager_accounts
+
+
+# ── Admin-only: remove a manager's access to a site ──────────────────────────
+
+class SiteAccessRemoveRequest(BaseModel):
+    manager_id: int
+    site_id: int
+
+
+@router.delete("/site-access", status_code=status.HTTP_204_NO_CONTENT)
+def remove_manager_site_access(
+    body: SiteAccessRemoveRequest,
+    db: Session = Depends(get_db),
+    _admin=Depends(get_current_admin),
+):
+    manager = db.query(ManagerAccount).filter(ManagerAccount.id == body.manager_id).first()
+    if not manager:
+        raise HTTPException(status_code=404, detail="Manager not found")
+
+    site = db.query(Site).filter(Site.id == body.site_id).first()
+    if not site:
+        raise HTTPException(status_code=404, detail="Site not found")
+
+    if site in manager.sites:
+        manager.sites.remove(site)
+        db.commit()
diff --git a/sysadmin_panel/src/api/client.js b/sysadmin_panel/src/api/client.js
index c577939..da88f16 100644
--- a/sysadmin_panel/src/api/client.js
+++ b/sysadmin_panel/src/api/client.js
@@ -22,3 +22,16 @@ client.interceptors.response.use(
 )
 
 export default client
+
+// ── Remote Manager accounts ───────────────────────────────────────────────────
+
+export const getManagersBySite = (siteId) =>
+  client.get(`/api/manager/by-site/${siteId}`)
+
+export const addManagerToSite = (email, fullName, password, siteId) =>
+  client.post('/api/manager/register', {
+    email, full_name: fullName, password, site_ids: [siteId],
+  })
+
+export const removeManagerSiteAccess = (managerId, siteId) =>
+  client.delete('/api/manager/site-access', { data: { manager_id: managerId, site_id: siteId } })
diff --git a/sysadmin_panel/src/pages/SiteDetailPage.jsx b/sysadmin_panel/src/pages/SiteDetailPage.jsx
index 5a7be57..3dabdfb 100644
--- a/sysadmin_panel/src/pages/SiteDetailPage.jsx
+++ b/sysadmin_panel/src/pages/SiteDetailPage.jsx
@@ -1,7 +1,7 @@
-import { useState, useEffect } from 'react'
+import { useState, useEffect, useCallback } from 'react'
 import { useParams, useNavigate } from 'react-router-dom'
 import toast from 'react-hot-toast'
-import client from '../api/client'
+import client, { getManagersBySite, addManagerToSite, removeManagerSiteAccess } from '../api/client'
 import LicenseStatus from '../components/LicenseStatus'
 import ConfirmModal from '../components/ConfirmModal'
 
@@ -26,12 +26,21 @@ export default function SiteDetailPage() {
   const [loading, setLoading] = useState(true)
   const [error, setError] = useState('')
 
-  const [modal, setModal] = useState(null) // 'lock' | 'unlock' | 'delete' | 'license' | 'domain'
+  const [modal, setModal] = useState(null) // 'lock' | 'unlock' | 'delete' | 'license' | 'domain' | 'add_manager'
   const [lockReason, setLockReason] = useState('')
   const [newExpiry, setNewExpiry] = useState('')
   const [newDomain, setNewDomain] = useState('')
   const [acting, setActing] = useState(false)
 
+  // Remote Managers state
+  const [managers, setManagers] = useState([])
+  const [managersLoading, setManagersLoading] = useState(false)
+  const [newMgrEmail, setNewMgrEmail] = useState('')
+  const [newMgrName, setNewMgrName] = useState('')
+  const [newMgrPass, setNewMgrPass] = useState('')
+  const [addingMgr, setAddingMgr] = useState(false)
+  const [removingMgrId, setRemovingMgrId] = useState(null)
+
   useEffect(() => {
     async function load() {
       try {
@@ -47,6 +56,49 @@ export default function SiteDetailPage() {
     load()
   }, [siteId])
 
+  const fetchManagers = useCallback(async () => {
+    setManagersLoading(true)
+    try {
+      const { data } = await getManagersBySite(siteId)
+      setManagers(data)
+    } catch {
+      toast.error('Failed to load managers')
+    } finally {
+      setManagersLoading(false)
+    }
+  }, [siteId])
+
+  useEffect(() => { fetchManagers() }, [fetchManagers])
+
+  async function doAddManager() {
+    if (!newMgrEmail.trim() || !newMgrPass.trim()) return
+    setAddingMgr(true)
+    try {
+      await addManagerToSite(newMgrEmail.trim(), newMgrName.trim(), newMgrPass.trim(), Number(siteId))
+      toast.success('Manager added')
+      setModal(null)
+      setNewMgrEmail(''); setNewMgrName(''); setNewMgrPass('')
+      fetchManagers()
+    } catch (e) {
+      toast.error(e.response?.data?.detail || 'Failed to add manager')
+    } finally {
+      setAddingMgr(false)
+    }
+  }
+
+  async function doRemoveManager(managerId) {
+    setRemovingMgrId(managerId)
+    try {
+      await removeManagerSiteAccess(managerId, Number(siteId))
+      toast.success('Access removed')
+      setManagers(prev => prev.filter(m => m.id !== managerId))
+    } catch (e) {
+      toast.error(e.response?.data?.detail || 'Failed to remove access')
+    } finally {
+      setRemovingMgrId(null)
+    }
+  }
+
   async function doLock() {
     if (!lockReason.trim()) return
     setActing(true)
@@ -270,6 +322,56 @@ export default function SiteDetailPage() {
         </div>
       </div>
 
+      {/* Remote Managers */}
+      <div className="bg-gray-900 border border-gray-700 rounded-xl p-4 mt-4">
+        <div className="flex items-center justify-between mb-3">
+          <h2 className="text-xs font-semibold text-gray-500 uppercase tracking-wider">Remote Managers</h2>
+          <button
+            onClick={() => setModal('add_manager')}
+            className="text-xs text-cyan-400 hover:text-cyan-300 transition-colors"
+          >
+            + Add Manager
+          </button>
+        </div>
+
+        {managersLoading && (
+          <p className="text-xs text-gray-500">Loading…</p>
+        )}
+
+        {!managersLoading && managers.length === 0 && (
+          <p className="text-xs text-gray-600 italic">No managers linked to this site.</p>
+        )}
+
+        {!managersLoading && managers.length > 0 && (
+          <div className="space-y-2">
+            {managers.map(mgr => (
+              <div key={mgr.id} className="flex items-center justify-between gap-3 bg-gray-800 rounded-lg px-3 py-2">
+                <div className="min-w-0">
+                  <p className="text-sm text-gray-200 font-medium truncate">{mgr.email}</p>
+                  {mgr.full_name && (
+                    <p className="text-xs text-gray-500 truncate">{mgr.full_name}</p>
+                  )}
+                </div>
+                <div className="flex items-center gap-2 shrink-0">
+                  <span className={`text-xs font-semibold px-2 py-0.5 rounded-full ${
+                    mgr.is_active ? 'bg-emerald-900/50 text-emerald-400' : 'bg-gray-700 text-gray-500'
+                  }`}>
+                    {mgr.is_active ? 'Active' : 'Inactive'}
+                  </span>
+                  <button
+                    onClick={() => doRemoveManager(mgr.id)}
+                    disabled={removingMgrId === mgr.id}
+                    className="text-xs text-red-400 hover:text-red-300 disabled:opacity-50 transition-colors"
+                  >
+                    {removingMgrId === mgr.id ? '…' : 'Remove'}
+                  </button>
+                </div>
+              </div>
+            ))}
+          </div>
+        )}
+      </div>
+
       {/* Modals */}
       {modal === 'lock' && (
         <ConfirmModal
@@ -349,6 +451,48 @@ export default function SiteDetailPage() {
           </div>
         </ConfirmModal>
       )}
+
+      {modal === 'add_manager' && (
+        <ConfirmModal
+          title="Add Remote Manager"
+          confirmLabel={addingMgr ? 'Adding…' : 'Add Manager'}
+          onCancel={() => { setModal(null); setNewMgrEmail(''); setNewMgrName(''); setNewMgrPass('') }}
+          onConfirm={doAddManager}
+        >
+          <div className="space-y-3 mb-2">
+            <div>
+              <label className="block text-xs text-gray-400 mb-1.5">Email *</label>
+              <input
+                type="email"
+                value={newMgrEmail}
+                onChange={e => setNewMgrEmail(e.target.value)}
+                placeholder="manager@example.com"
+                className="w-full bg-gray-800 border border-gray-600 text-white text-sm rounded-lg px-3 py-2 focus:outline-none focus:ring-1 focus:ring-cyan-500 placeholder-gray-600"
+              />
+            </div>
+            <div>
+              <label className="block text-xs text-gray-400 mb-1.5">Full name</label>
+              <input
+                type="text"
+                value={newMgrName}
+                onChange={e => setNewMgrName(e.target.value)}
+                placeholder="Jane Smith"
+                className="w-full bg-gray-800 border border-gray-600 text-white text-sm rounded-lg px-3 py-2 focus:outline-none focus:ring-1 focus:ring-cyan-500 placeholder-gray-600"
+              />
+            </div>
+            <div>
+              <label className="block text-xs text-gray-400 mb-1.5">Password * <span className="text-gray-600">(ignored if account already exists)</span></label>
+              <input
+                type="password"
+                value={newMgrPass}
+                onChange={e => setNewMgrPass(e.target.value)}
+                placeholder="••••••••"
+                className="w-full bg-gray-800 border border-gray-600 text-white text-sm rounded-lg px-3 py-2 focus:outline-none focus:ring-1 focus:ring-cyan-500 placeholder-gray-600"
+              />
+            </div>
+          </div>
+        </ConfirmModal>
+      )}
     </div>
   )
 }