diff --git a/pages/Settings.tsx b/pages/Settings.tsx
index 1327bb5..b17f414 100644
--- a/pages/Settings.tsx
+++ b/pages/Settings.tsx
@@ -6,7 +6,7 @@ import {
   Save, Building, Coins, Plus, Pencil, Trash2, X, CalendarCheck, 
   AlertTriangle, User as UserIcon, Server, Bell, Clock, FileText, 
   Lock, Megaphone, CheckCircle2, Info, Hammer, Link as LinkIcon, 
-  Eye, Calendar, List, UserCog, Mail, Power, MapPin, CreditCard, 
+  Eye, EyeOff, Calendar, List, UserCog, Mail, Power, MapPin, CreditCard, 
   ToggleLeft, ToggleRight, LayoutGrid, PieChart, Users, Send, Cloud, HardDrive, ChevronRight, Palette, Image as ImageIcon, Upload
 } from 'lucide-react';
 
@@ -51,6 +51,7 @@ export const SettingsPage: React.FC = () => {
   const [condoForm, setCondoForm] = useState<Partial<Condo>>({ 
       name: '', address: '', streetNumber: '', city: '', province: '', zipCode: '', notes: '', paypalClientId: '', defaultMonthlyQuota: 100, dueDay: 10
   });
+  const [showPayPalKey, setShowPayPalKey] = useState(false); // State for PayPal input visibility
 
   const [saving, setSaving] = useState(false);
   const [successMsg, setSuccessMsg] = useState('');
@@ -342,7 +343,26 @@ export const SettingsPage: React.FC = () => {
                                         <div><label className="text-xs font-bold text-slate-500 uppercase mb-2 block">Scadenza (Giorno)</label><input type="number" value={activeCondo.dueDay || 10} onChange={e => setActiveCondo({...activeCondo, dueDay: parseInt(e.target.value)})} className="w-full border border-slate-200 p-3 rounded-xl" /></div>
                                     </div>
                                 </div>
-                                <div><label className="text-xs font-bold text-slate-500 uppercase mb-2 block">PayPal Client ID</label><input type="text" value={activeCondo.paypalClientId || ''} onChange={e => setActiveCondo({...activeCondo, paypalClientId: e.target.value})} className="w-full border border-slate-200 p-3 rounded-xl text-xs font-mono" /></div>
+                                <div>
+                                    <label className="text-xs font-bold text-slate-500 uppercase mb-2 block">PayPal Client ID</label>
+                                    <div className="relative">
+                                        <input
+                                            type={showPayPalKey ? "text" : "password"}
+                                            value={activeCondo.paypalClientId || ''}
+                                            onChange={e => setActiveCondo({...activeCondo, paypalClientId: e.target.value})}
+                                            className="w-full border border-slate-200 p-3 rounded-xl text-xs font-mono pr-10"
+                                            placeholder="sandbox_..."
+                                        />
+                                        <button
+                                            type="button"
+                                            onClick={() => setShowPayPalKey(!showPayPalKey)}
+                                            className="absolute right-3 top-3 text-slate-400 hover:text-blue-600 transition-colors"
+                                        >
+                                            {showPayPalKey ? <EyeOff className="w-4 h-4" /> : <Eye className="w-4 h-4" />}
+                                        </button>
+                                    </div>
+                                    <p className="text-[10px] text-slate-400 mt-1">Necessario per abilitare i pagamenti online.</p>
+                                </div>
                                 <div className="pt-6 border-t flex justify-between items-center">
                                     <div className="flex-1">{successMsg && <span className="text-green-600 font-bold flex items-center gap-2"><CheckCircle2 className="w-5 h-5"/> {successMsg}</span>}</div>
                                     <button type="submit" disabled={saving} className="bg-blue-600 text-white px-8 py-3 rounded-xl font-bold hover:bg-blue-700 shadow-lg flex items-center justify-center gap-2 disabled:opacity-50">
@@ -443,12 +463,27 @@ export const SettingsPage: React.FC = () => {
                 <div className="bg-white rounded-2xl shadow-sm border border-slate-200 p-8">
                     <div className="flex justify-between items-center mb-8"><h3 className="text-xl font-bold text-slate-800">Utenti</h3><button onClick={openAddUserModal} className="bg-blue-600 text-white px-4 py-2 rounded-xl font-bold flex items-center justify-center gap-2"><Plus className="w-4 h-4"/> Aggiungi</button></div>
                     <div className="grid gap-4 md:grid-cols-2">
-                        {users.map(u => (
-                            <div key={u.id} className="p-5 border border-slate-100 rounded-2xl bg-slate-50 flex items-center justify-between">
-                                <div><p className="font-bold text-slate-800">{u.name}</p><p className="text-xs text-slate-400">{u.email}</p><span className="text-[10px] uppercase font-bold bg-white px-2 py-0.5 rounded border border-slate-200 mt-1 inline-block">{u.role}</span></div>
-                                <div className="flex gap-1"><button onClick={() => openEditUserModal(u)} className="p-2 text-blue-600 hover:bg-white rounded-lg"><Pencil className="w-4 h-4"/></button><button onClick={() => handleDeleteUser(u.id)} className="p-2 text-red-500 hover:bg-white rounded-lg"><Trash2 className="w-4 h-4"/></button></div>
-                            </div>
-                        ))}
+                        {users.map(u => {
+                            const isTargetAdmin = u.role === 'admin';
+                            // Logic: PowerUsers cannot edit/delete Admins
+                            const canManage = !(currentUser?.role === 'poweruser' && isTargetAdmin);
+
+                            return (
+                                <div key={u.id} className="p-5 border border-slate-100 rounded-2xl bg-slate-50 flex items-center justify-between">
+                                    <div><p className="font-bold text-slate-800">{u.name}</p><p className="text-xs text-slate-400">{u.email}</p><span className="text-[10px] uppercase font-bold bg-white px-2 py-0.5 rounded border border-slate-200 mt-1 inline-block">{u.role}</span></div>
+                                    <div className="flex gap-1">
+                                        {canManage ? (
+                                            <>
+                                                <button onClick={() => openEditUserModal(u)} className="p-2 text-blue-600 hover:bg-white rounded-lg"><Pencil className="w-4 h-4"/></button>
+                                                <button onClick={() => handleDeleteUser(u.id)} className="p-2 text-red-500 hover:bg-white rounded-lg"><Trash2 className="w-4 h-4"/></button>
+                                            </>
+                                        ) : (
+                                            <span className="text-[10px] text-slate-400 font-medium italic px-2 py-1">Protetto</span>
+                                        )}
+                                    </div>
+                                </div>
+                            );
+                        })}
                     </div>
                 </div>
             )}