diff --git a/poverty-mapping/index.html b/poverty-mapping/index.html
index ee154f8..d8d196d 100644
--- a/poverty-mapping/index.html
+++ b/poverty-mapping/index.html
@@ -241,6 +241,20 @@
     </div>
 </div>
 
+<div id="admin-reject-modal" class="modal hidden" role="dialog" aria-hidden="true" style="z-index:11000">
+    <div class="modal-content" style="max-width:480px;width:min(480px,90vw)">
+        <h3>Alasan Penolakan</h3>
+        <div style="font-size:13px;color:#475569;margin-bottom:12px">Silakan masukkan alasan penolakan untuk pengelola ini. Alasan akan dikirimkan ke email pendaftar.</div>
+        <div style="margin-bottom:16px">
+            <textarea id="admin-reject-reason-input" style="width:100%;height:100px;padding:8px;border:1px solid #cbd5e1;border-radius:6px;box-sizing:border-box" placeholder="Tulis alasan di sini..."></textarea>
+        </div>
+        <div class="modal-actions" style="display:flex;justify-content:flex-end;gap:8px">
+            <button type="button" id="admin-reject-cancel" class="btn-secondary">Batal</button>
+            <button type="button" id="admin-reject-submit" class="btn-destructive">Tolak Pendaftaran</button>
+        </div>
+    </div>
+</div>
+
 <!-- Email Verification Modal -->
 
 <!-- Image viewer modal (separate from form modal) -->
@@ -918,22 +932,61 @@ async function approvePendingUser(id){
     }catch(e){ console.error(e); showToast('Gagal menyetujui user', 'error', 4000); }
 }
 
-async function rejectPendingUser(id){
-    const reason = prompt("Masukkan alasan penolakan:");
-    if (reason === null) return; // user cancelled
-    const trimmedReason = reason.trim();
-    if (!trimmedReason) {
-        showToast("Alasan penolakan wajib diisi!", "error", 4000);
-        return;
+function closeRejectModal(){
+    const modal = document.getElementById('admin-reject-modal');
+    if(modal) {
+        modal.classList.add('hidden');
+        modal.setAttribute('aria-hidden','true');
     }
-    try{
-        const resp = await fetch('src/api/admin/reject_user.php', { method: 'POST', headers: buildHeaders(), body: JSON.stringify({ id: id, reason: trimmedReason }), credentials: 'same-origin' });
-        const jr = await resp.json().catch(()=>null);
-        if(!resp.ok || !jr || !jr.success){ showToast('Gagal menolak user', 'error', 4000); return; }
-        showToast('User ditolak', 'success', 3000);
-        closePendingManagerDetail();
-        openAdminDashboard();
-    }catch(e){ console.error(e); showToast('Gagal menolak user', 'error', 4000); }
+}
+
+function rejectPendingUser(id){
+    const modal = document.getElementById('admin-reject-modal');
+    const input = document.getElementById('admin-reject-reason-input');
+    const submitBtn = document.getElementById('admin-reject-submit');
+    const cancelBtn = document.getElementById('admin-reject-cancel');
+    if(!modal || !input || !submitBtn || !cancelBtn) return;
+    
+    input.value = '';
+    submitBtn.disabled = false;
+    submitBtn.textContent = 'Tolak Pendaftaran';
+    
+    cancelBtn.onclick = function(){
+        closeRejectModal();
+    };
+    
+    submitBtn.onclick = async function(){
+        const reason = input.value.trim();
+        if(!reason){
+            showToast('Alasan penolakan wajib diisi!', 'error', 4000);
+            return;
+        }
+        submitBtn.disabled = true;
+        submitBtn.textContent = 'Memproses...';
+        
+        try{
+            const resp = await fetch('src/api/admin/reject_user.php', { method: 'POST', headers: buildHeaders(), body: JSON.stringify({ id: id, reason: reason }), credentials: 'same-origin' });
+            const jr = await resp.json().catch(()=>null);
+            if(!resp.ok || !jr || !jr.success){
+                showToast('Gagal menolak user', 'error', 4000);
+                submitBtn.disabled = false;
+                submitBtn.textContent = 'Tolak Pendaftaran';
+                return;
+            }
+            showToast('User ditolak', 'success', 3000);
+            closeRejectModal();
+            closePendingManagerDetail();
+            openAdminDashboard();
+        }catch(e){
+            console.error(e);
+            showToast('Gagal menolak user', 'error', 4000);
+            submitBtn.disabled = false;
+            submitBtn.textContent = 'Tolak Pendaftaran';
+        }
+    };
+    
+    modal.classList.remove('hidden');
+    modal.setAttribute('aria-hidden','false');
 }
 
 function closeAdminDashboard(){
@@ -2411,6 +2464,7 @@ try{
     document.getElementById('auth-modal').addEventListener('click', function(ev){ if(ev.target === this) closeAuthModal(); });
     document.getElementById('admin-modal').addEventListener('click', function(ev){ if(ev.target === this) closeAdminDashboard(); });
     document.getElementById('admin-detail-modal').addEventListener('click', function(ev){ if(ev.target === this) closePendingManagerDetail(); });
+    document.getElementById('admin-reject-modal').addEventListener('click', function(ev){ if(ev.target === this) closeRejectModal(); });
 
 // Admin dashboard wiring is handled by openAdminDashboard() above.
 }catch(e){}
diff --git a/poverty-mapping/src/api/admin/reject_user.php b/poverty-mapping/src/api/admin/reject_user.php
index b06a022..cc0028f 100644
--- a/poverty-mapping/src/api/admin/reject_user.php
+++ b/poverty-mapping/src/api/admin/reject_user.php
@@ -8,7 +8,10 @@ require_role('admin');
 
 // Ensure column exists
 try {
-	$conn->query("ALTER TABLE users ADD COLUMN IF NOT EXISTS rejection_reason TEXT NULL");
+	$check = $conn->query("SHOW COLUMNS FROM users LIKE 'rejection_reason'");
+	if($check && $check->num_rows === 0){
+		$conn->query("ALTER TABLE users ADD COLUMN rejection_reason TEXT NULL");
+	}
 } catch(Exception $e){}
 
 $data = json_decode(file_get_contents('php://input'), true);