diff --git a/index.html b/index.html
index 532b751..5db40ff 100644
--- a/index.html
+++ b/index.html
@@ -139,6 +139,60 @@
             { id: 3, message: 'Manutenção urgente reportada', time: 'Há 5 horas', type: 'warning', read: false },
         ];
 
+        // --- VALIDAÇÕES OFICIAIS ---
+        function validarNIF(nif) {
+            nif = nif.replace(/\s+/g, '');
+            if (!/^\d{9}$/.test(nif)) return false;
+            if (nif.charAt(0) === '0') return false;
+            let soma = 0;
+            for (let i = 0; i < 8; i++) {
+                soma += parseInt(nif.charAt(i), 10) * (9 - i);
+            }
+            const resto = soma % 11;
+            const digitoControlo = (resto === 0 || resto === 1) ? 0 : (11 - resto);
+            return digitoControlo === parseInt(nif.charAt(8), 10);
+        }
+
+        function validarDocumento(doc) {
+            let docStr = doc.replace(/[\s-]/g, '').toUpperCase();
+            
+            // Muitos utilizadores inserem apenas os 8 dígitos do NIC, o que não tem check-digit na própria string
+            if (/^\d{8}$/.test(docStr)) {
+                return true; 
+            }
+
+            if (/^\d{9}$/.test(docStr)) {
+                let checkDigitValue = parseInt(docStr.charAt(docStr.length - 1), 10);
+                let soma = 0;
+                for (let i = 0; i < docStr.length - 1; i++) {
+                    soma += parseInt(docStr.charAt(i), 10) * (docStr.length - i);
+                }
+                let resto = soma % 11;
+                let expectedDigit = (resto === 0 || resto === 1) ? 0 : (11 - resto);
+                return expectedDigit === checkDigitValue;
+            }
+            if (docStr.length === 12) {
+                let sum = 0;
+                let isSecond = false;
+                for (let i = docStr.length - 1; i >= 0; i--) {
+                    let charCode = docStr.charCodeAt(i);
+                    let val = 0;
+                    if (charCode >= 48 && charCode <= 57) val = charCode - 48;
+                    else if (charCode >= 65 && charCode <= 90) val = charCode - 55;
+                    else return false;
+
+                    if (isSecond) {
+                        val *= 2;
+                        if (val >= 36) val -= 36;
+                    }
+                    sum += val;
+                    isSecond = !isSecond;
+                }
+                return (sum % 36) === 0;
+            }
+            return false;
+        }
+
         const Modal = ({ isOpen, onClose, title, children }) => {
             if (!isOpen) return null;
             return (
@@ -241,6 +295,7 @@
                 'Receita': 'bg-green-100 text-green-700 border-green-200 dark:bg-green-900/30 dark:text-green-400 dark:border-green-800',
                 'Confirmado': 'bg-green-100 text-green-700 border-green-200 dark:bg-green-900/30 dark:text-green-400 dark:border-green-800',
                 'Pendente': 'bg-yellow-100 text-yellow-700 border-yellow-200 dark:bg-yellow-900/30 dark:text-yellow-400 dark:border-yellow-800',
+                'Em Validação': 'bg-orange-100 text-orange-700 border-orange-200 dark:bg-orange-900/30 dark:text-orange-400 dark:border-orange-800',
                 'Em Progresso': 'bg-blue-100 text-blue-700 border-blue-200 dark:bg-blue-900/30 dark:text-blue-400 dark:border-blue-800',
                 'Média': 'bg-orange-100 text-orange-700 border-orange-200 dark:bg-orange-900/30 dark:text-orange-400 dark:border-orange-800',
                 'Atrasado': 'bg-red-100 text-red-700 border-red-200 dark:bg-red-900/30 dark:text-red-400 dark:border-red-800',
@@ -286,6 +341,18 @@
 
             const handleSubmit = async (e) => {
                 e.preventDefault();
+                setError('');
+
+                if (!validarNIF(formData.nif)) {
+                    setError('NIF inválido. Verifique o número inserido.');
+                    return;
+                }
+
+                if (!validarDocumento(formData.cc)) {
+                    setError('Cartão de Cidadão / BI inválido. Verifique o número inserido.');
+                    return;
+                }
+
                 if (formData.password !== formData.confirmPassword) {
                     setError('As palavras-passe não coincidem.');
                     return;
@@ -298,6 +365,7 @@
 
             const handleChange = (e) => {
                 setFormData({...formData, [e.target.name]: e.target.value});
+                setError('');
             };
 
             return (
@@ -643,6 +711,7 @@
             const [issues, setIssues] = useState([]);
             const [bookings, setBookings] = useState([]);
             const [invoices, setInvoices] = useState([]);
+            const [faturas, setFaturas] = useState([]);
             const [messages, setMessages] = useState([]);
             const [newMessageText, setNewMessageText] = useState('');
             const [activeChat, setActiveChat] = useState({ type: 'global', id: 'global', name: 'Fórum do Condomínio' });
@@ -666,12 +735,41 @@
                 const unsubIssues = loadData('manutencao', setIssues, (a,b) => new Date(b.date) - new Date(a.date));
                 const unsubBookings = loadData('reservas', setBookings, (a,b) => new Date(a.date) - new Date(b.date));
                 const unsubInvoices = loadData('faturacao', setInvoices, (a,b) => new Date(b.date) - new Date(a.date));
+                const unsubFaturas = loadData('faturas', setFaturas, (a,b) => new Date(b.dataVencimento) - new Date(a.dataVencimento));
 
                 return () => {
-                    unsubResidents(); unsubFinances(); unsubIssues(); unsubBookings(); unsubInvoices();
+                    unsubResidents();
+                    unsubFinances();
+                    unsubIssues();
+                    unsubBookings();
+                    unsubInvoices();
+                    unsubFaturas();
                 };
             }, []);
 
+            useEffect(() => {
+                if (!isAuthenticated || !currentUserId) {
+                    setNotificationsList([]);
+                    return;
+                }
+                
+                const targetFolder = userRole === 'admin' ? 'admin' : currentUserId;
+                const path = `notificacoes/${targetFolder}`;
+                
+                const unsub = onValue(ref(db, path), (snapshot) => {
+                    const data = snapshot.val();
+                    if (data) {
+                        let parsed = Object.entries(data).map(([id, val]) => ({ id, ...val }));
+                        parsed = parsed.sort((a,b) => b.timestamp - a.timestamp);
+                        setNotificationsList(parsed);
+                    } else {
+                        setNotificationsList([]);
+                    }
+                }, (error) => console.error(`Erro ao carregar notificações:`, error));
+                
+                return () => unsub();
+            }, [isAuthenticated, currentUserId, userRole]);
+
             useEffect(() => {
                 let path = 'mural_mensagens';
                 if (activeChat.type === 'private') {
@@ -691,7 +789,7 @@
                 
                 return () => unsub();
             }, [activeChat, currentUserId]);
-            const [notificationsList, setNotificationsList] = useState(INITIAL_NOTIFICATIONS);
+            const [notificationsList, setNotificationsList] = useState([]);
             const [isNotificationsOpen, setNotificationsOpen] = useState(false);
 
             const [activeModal, setActiveModal] = useState(null);
@@ -705,6 +803,7 @@
             const initialFinanceForm = { type: 'expense', category: '', amount: '', desc: '', date: new Date().toISOString().split('T')[0] };
             const initialIssueForm = { title: '', location: '', priority: 'Média', status: 'Novo', date: new Date().toISOString().split('T')[0] };
             const initialBookingForm = { facility: 'gym', date: new Date().toISOString().split('T')[0], time: '', resident: '', cost: 0 };
+            const initialFaturaForm = { moradorId: '', categoria: '', valor: '', dataVencimento: new Date().toISOString().split('T')[0] };
 
             const [formData, setFormData] = useState({});
 
@@ -753,14 +852,18 @@
                 r.unit.toLowerCase().includes(searchQuery.toLowerCase())
             );
 
-            const showNotification = (message, type = 'success') => {
-                setNotification({ message, type });
-                const newNotif = { id: Date.now(), message, time: 'Agora', type, read: false };
-                setNotificationsList(prev => [newNotif, ...prev]);
+            const sendSystemNotification = async (message, type = 'info', targetUserId = 'admin') => {
+                const newNotif = { timestamp: Date.now(), message, time: 'Agora', type, read: false };
+                await push(ref(db, `notificacoes/${targetUserId}`), newNotif);
             };
 
-            const handleClearNotifications = () => {
-                setNotificationsList([]);
+            const showNotification = (message, type = 'success') => {
+                setNotification({ message, type });
+            };
+
+            const handleClearNotifications = async () => {
+                const targetFolder = userRole === 'admin' ? 'admin' : currentUserId;
+                await set(ref(db, `notificacoes/${targetFolder}`), null);
                 setNotificationsOpen(false);
             };
 
@@ -774,6 +877,8 @@
                     setFormData(initialFinanceForm);
                 } else if (type === 'issue') {
                     setFormData(initialIssueForm);
+                } else if (type === 'emitir_fatura') {
+                    setFormData(initialFaturaForm);
                 } else if (type === 'booking') {
                     const baseForm = initialBookingForm;
                     if (defaultFacility) baseForm.facility = defaultFacility;
@@ -900,6 +1005,69 @@
                 }
             };
 
+            const handleSaveFatura = async (e) => {
+                e.preventDefault();
+                if (!formData.moradorId || !formData.categoria || !formData.valor || !formData.dataVencimento) {
+                    showNotification("Preencha todos os campos obrigatórios.", "error");
+                    return;
+                }
+                try {
+                    const morador = residents.find(r => r.id === formData.moradorId);
+                    if (!morador) return;
+
+                    const valor = Number(formData.valor);
+                    const newFaturaRef = push(ref(db, 'faturas'));
+                    await set(newFaturaRef, { 
+                        moradorId: morador.id,
+                        nomeMorador: morador.name,
+                        fracao: morador.unit,
+                        categoria: formData.categoria,
+                        valor: valor,
+                        dataVencimento: formData.dataVencimento,
+                        status: 'Pendente',
+                        dataEmissao: new Date().toISOString().split('T')[0]
+                    });
+
+                    const newPending = (Number(morador.pending) || 0) + valor;
+                    await set(ref(db, `condominos/${morador.id}/pending`), newPending);
+
+                    showNotification(`Fatura de ${valor.toFixed(2)}€ emitida para ${morador.name}`);
+                    handleCloseModal();
+                } catch (error) {
+                    console.error("Erro ao emitir fatura:", error);
+                    showNotification("Erro ao emitir fatura.", "error");
+                }
+            };
+
+            const handlePayFatura = async (fatura) => {
+                try {
+                    await set(ref(db, `faturas/${fatura.id}/status`), 'Em Validação');
+                    sendSystemNotification(`Comprovativo recebido da fração ${fatura.fracao}.`, 'info', 'admin');
+                    showNotification("Comprovativo enviado! A aguardar validação do administrador.", "success");
+                } catch (error) {
+                    console.error("Erro ao pagar fatura:", error);
+                    showNotification("Erro ao processar pagamento.", "error");
+                }
+            };
+
+            const handleApproveFatura = async (fatura) => {
+                try {
+                    await set(ref(db, `faturas/${fatura.id}/status`), 'Pago');
+
+                    const morador = residents.find(r => r.id === fatura.moradorId);
+                    if (morador) {
+                        let newPending = (Number(morador.pending) || 0) - Number(fatura.valor);
+                        if (newPending < 0) newPending = 0;
+                        await set(ref(db, `condominos/${morador.id}/pending`), newPending);
+                    }
+                    sendSystemNotification(`O seu pagamento da fatura de ${fatura.categoria} foi aprovado!`, 'success', fatura.moradorId);
+                    showNotification("Pagamento aprovado com sucesso!", "success");
+                } catch (error) {
+                    console.error("Erro ao aprovar fatura:", error);
+                    showNotification("Erro ao processar aprovação.", "error");
+                }
+            };
+
             const handleResolveIssue = async (id) => {
                 try {
                     const issue = issues.find(i => i.id === id);
@@ -1281,7 +1449,10 @@
                                             </div>
                                             <InputGroup label="Morada (Sede)" value="Rua das Flores, nº 123, Escritório 2B" />
                                             <div className="flex justify-end mt-6">
-                                                <button onClick={() => showNotification('Alterações guardadas com sucesso!', 'success')} className="bg-blue-600 text-white px-6 py-2 rounded-lg font-medium hover:bg-blue-700 shadow-sm transition-colors">
+                                                <button onClick={() => {
+                                                    showNotification('Alterações guardadas com sucesso!', 'success');
+                                                    sendSystemNotification('Um utilizador atualizou os seus dados pessoais.', 'info', 'admin');
+                                                }} className="bg-blue-600 text-white px-6 py-2 rounded-lg font-medium hover:bg-blue-700 shadow-sm transition-colors">
                                                     Guardar Alterações
                                                 </button>
                                             </div>
@@ -1297,7 +1468,10 @@
                                             <div>
                                                 <h4 className="font-bold text-orange-800 dark:text-orange-300 text-sm">Autenticação de Dois Fatores (2FA)</h4>
                                                 <p className="text-xs text-orange-700 dark:text-orange-400 mt-1">Recomendamos ativar o 2FA para maior segurança da sua conta.</p>
-                                                <button onClick={() => showNotification('Autenticação de Dois Fatores ativada com sucesso!', 'success')} className="text-orange-900 dark:text-orange-200 text-xs font-bold underline mt-2">Ativar Agora</button>
+                                                <button onClick={() => {
+                                                    showNotification('Autenticação de Dois Fatores ativada com sucesso!', 'success');
+                                                    sendSystemNotification('Um utilizador ativou a autenticação 2FA.', 'success', 'admin');
+                                                }} className="text-orange-900 dark:text-orange-200 text-xs font-bold underline mt-2">Ativar Agora</button>
                                             </div>
                                         </div>
 
@@ -1308,7 +1482,10 @@
                                                 <InputGroup label="Confirmar Nova Palavra-passe" type="password" placeholder="Confirmar" />
                                             </div>
                                             <div className="flex justify-end mt-6">
-                                                <button onClick={() => showNotification('Segurança atualizada com sucesso!', 'success')} className="bg-slate-800 dark:bg-slate-700 text-white px-6 py-2 rounded-lg font-medium hover:bg-slate-900 dark:hover:bg-slate-600 shadow-sm transition-colors">
+                                                <button onClick={() => {
+                                                    showNotification('Segurança atualizada com sucesso!', 'success');
+                                                    sendSystemNotification('Um utilizador alterou a palavra-passe.', 'info', 'admin');
+                                                }} className="bg-slate-800 dark:bg-slate-700 text-white px-6 py-2 rounded-lg font-medium hover:bg-slate-900 dark:hover:bg-slate-600 shadow-sm transition-colors">
                                                     Atualizar Segurança
                                                 </button>
                                             </div>
@@ -1440,6 +1617,7 @@
                                 {userRole === 'admin' && <SidebarItem icon={Wallet} label="Finanças" active={activeTab === 'finance'} onClick={() => { setActiveTab('finance'); setSidebarOpen(false); }} />}
                                 {userRole === 'admin' && <SidebarItem icon={FileText} label="Faturação" active={activeTab === 'billing'} onClick={() => { setActiveTab('billing'); setSidebarOpen(false); }} />}
                                 {userRole === 'admin' && <SidebarItem icon={Users} label="Aprovações" active={activeTab === 'approvals'} onClick={() => { setActiveTab('approvals'); setSidebarOpen(false); }} />}
+                                {userRole === 'morador' && <SidebarItem icon={Wallet} label="Minhas Contas" active={activeTab === 'minhas_contas'} onClick={() => { setActiveTab('minhas_contas'); setSidebarOpen(false); }} />}
                                 <SidebarItem icon={Wrench} label="Manutenção" active={activeTab === 'maintenance'} onClick={() => { setActiveTab('maintenance'); setSidebarOpen(false); }} />
                                 <SidebarItem icon={MessageCircle} label="Mensagens" active={activeTab === 'messages'} onClick={() => { setActiveTab('messages'); setSidebarOpen(false); }} />
                                 <SidebarItem icon={Map} label="Mapa" active={activeTab === 'map'} onClick={() => { setActiveTab('map'); setSidebarOpen(false); }} />
@@ -1692,6 +1870,62 @@
                                                 </table>
                                             </div>
                                         </div>
+
+                                        <div className="mt-8 mb-6">
+                                            <h2 className="text-2xl font-bold text-slate-800 dark:text-white">Aprovações de Pagamentos</h2>
+                                            <p className="text-slate-500 dark:text-dark-mute">Valide ou rejeite pagamentos de faturas enviados pelos condóminos.</p>
+                                        </div>
+                                        <div className="bg-white dark:bg-dark-surface rounded-xl shadow-sm border border-slate-100 dark:border-dark-border overflow-hidden">
+                                            <div className="overflow-x-auto">
+                                                <table className="w-full text-left border-collapse">
+                                                    <thead>
+                                                        <tr className="bg-slate-50 dark:bg-dark-bg border-b border-slate-100 dark:border-dark-border text-sm font-semibold text-slate-500 dark:text-slate-400">
+                                                            <th className="p-4">Morador</th>
+                                                            <th className="p-4">Fatura</th>
+                                                            <th className="p-4">Valor</th>
+                                                            <th className="p-4 text-center">Ações</th>
+                                                        </tr>
+                                                    </thead>
+                                                    <tbody>
+                                                        {faturas.filter(f => f.status === 'Em Validação').map(fatura => (
+                                                            <tr key={fatura.id} className="border-b border-slate-50 dark:border-dark-border hover:bg-slate-50/50 dark:hover:bg-dark-bg/50">
+                                                                <td className="p-4">
+                                                                    <p className="font-semibold text-slate-700 dark:text-slate-200">{fatura.nomeMorador}</p>
+                                                                    <p className="text-xs text-slate-400">Fração: {fatura.fracao}</p>
+                                                                </td>
+                                                                <td className="p-4 text-slate-600 dark:text-slate-400">
+                                                                    <p className="text-sm">{fatura.categoria}</p>
+                                                                    <p className="text-xs">Vence: {fatura.dataVencimento}</p>
+                                                                </td>
+                                                                <td className="p-4 font-bold text-slate-800 dark:text-slate-200">{Number(fatura.valor).toFixed(2)}€</td>
+                                                                <td className="p-4">
+                                                                    <div className="flex justify-center gap-2">
+                                                                        <button onClick={() => {
+                                                                            if(window.confirm('Aprovar o pagamento desta fatura?')) {
+                                                                                handleApproveFatura(fatura);
+                                                                            }
+                                                                        }} className="p-2 bg-green-100 text-green-600 rounded hover:bg-green-200 dark:bg-green-900/30 dark:text-green-400" title="Aprovar Pagamento">
+                                                                            <CheckCircle size={18} />
+                                                                        </button>
+                                                                        <button onClick={() => {
+                                                                            if(window.confirm('Rejeitar este pagamento?')) {
+                                                                                set(ref(db, `faturas/${fatura.id}/status`), 'Pendente');
+                                                                                showNotification('Pagamento rejeitado.', 'warning');
+                                                                            }
+                                                                        }} className="p-2 bg-red-100 text-red-600 rounded hover:bg-red-200 dark:bg-red-900/30 dark:text-red-400" title="Rejeitar Pagamento">
+                                                                            <X size={18} />
+                                                                        </button>
+                                                                    </div>
+                                                                </td>
+                                                            </tr>
+                                                        ))}
+                                                        {faturas.filter(f => f.status === 'Em Validação').length === 0 && (
+                                                            <tr><td colSpan="4" className="p-8 text-center text-slate-500">Nenhum pagamento pendente de aprovação.</td></tr>
+                                                        )}
+                                                    </tbody>
+                                                </table>
+                                            </div>
+                                        </div>
                                     </div>
                                 )}
 
@@ -1792,8 +2026,8 @@
                                                 <h3 className="font-bold text-lg text-slate-800 dark:text-white">Avisos de Cobrança</h3>
                                                 <p className="text-sm text-slate-500 dark:text-dark-mute">Emita faturas ou avise condóminos individualmente</p>
                                             </div>
-                                            <button onClick={() => showNotification("Funcionalidade de Emissão Automática em Breve!", "warning")} className="bg-blue-600 text-white px-4 py-2 rounded-lg text-sm font-medium hover:bg-blue-700 flex items-center justify-center gap-2 shadow-sm">
-                                                <FileText size={18} /> Emitir Faturas
+                                            <button onClick={() => handleOpenModal('emitir_fatura')} className="bg-blue-600 text-white px-4 py-2 rounded-lg text-sm font-medium hover:bg-blue-700 flex items-center justify-center gap-2 shadow-sm">
+                                                <FileText size={18} /> Emitir Fatura
                                             </button>
                                         </div>
                                         <div className="overflow-x-auto flex-1">
@@ -1816,7 +2050,10 @@
                                                             </td>
                                                             <td className="px-6 py-4 text-center">
                                                                 <button
-                                                                    onClick={() => showNotification(`Aviso de cobrança enviado para ${resident.email}`, 'success')}
+                                                                    onClick={() => {
+                                                                        showNotification(`Aviso de cobrança enviado para ${resident.email}`, 'success');
+                                                                        sendSystemNotification(`Aviso de cobrança enviado a ${resident.name} para a fração ${resident.unit}.`, 'info', resident.id);
+                                                                    }}
                                                                     className={`px-3 py-1.5 rounded-lg text-xs font-bold transition-colors shadow-sm cursor-pointer ${resident.pending > 0 ? 'bg-orange-600 text-white hover:bg-orange-700' : 'bg-slate-200 text-slate-400 cursor-not-allowed dark:bg-slate-800 dark:text-slate-600'}`}
                                                                     disabled={resident.pending <= 0}
                                                                 >
@@ -1829,7 +2066,10 @@
                                                                     Faturar na Hora
                                                                 </button>
                                                                 <button
-                                                                    onClick={() => showNotification(`Fatura enviada com sucesso para ${resident.email}`, 'success')}
+                                                                    onClick={() => {
+                                                                        showNotification(`Fatura enviada com sucesso para ${resident.email}`, 'success');
+                                                                        sendSystemNotification(`Fatura enviada a ${resident.name} (${resident.unit}) por email.`, 'info', resident.id);
+                                                                    }}
                                                                     className="ml-2 px-3 py-1.5 rounded-lg text-xs font-bold transition-colors shadow-sm bg-blue-600 text-white hover:bg-blue-700 dark:bg-blue-600 dark:hover:bg-blue-700"
                                                                 >
                                                                     Enviar por Email
@@ -1842,6 +2082,91 @@
                                         </div>
                                     </div>
                                 )}
+                                {/* --- MINHAS CONTAS (Morador) --- */}
+                                {activeTab === 'minhas_contas' && userRole === 'morador' && (
+                                    <div className="space-y-6 animate-fade-in h-full flex flex-col">
+                                        <div className="grid grid-cols-1 md:grid-cols-2 gap-6">
+                                            <div className="bg-white dark:bg-dark-surface p-6 rounded-xl shadow-sm border border-slate-100 dark:border-dark-border border-l-4 border-l-orange-500 relative overflow-hidden transition-colors">
+                                                <div className="relative z-10">
+                                                    <h4 className="text-slate-500 dark:text-dark-mute text-xs font-bold uppercase tracking-wider">Total Pendente</h4>
+                                                    <p className="text-2xl font-bold text-slate-800 dark:text-white mt-1">
+                                                        {faturas.filter(f => f.moradorId === currentUserId && f.status === 'Pendente').reduce((acc, f) => acc + Number(f.valor), 0).toFixed(2)}€
+                                                    </p>
+                                                </div>
+                                                <AlertCircle className="absolute right-4 bottom-4 text-orange-100 dark:text-orange-900/20" size={64} />
+                                            </div>
+                                            <div className="bg-white dark:bg-dark-surface p-6 rounded-xl shadow-sm border border-slate-100 dark:border-dark-border border-l-4 border-l-green-500 relative overflow-hidden transition-colors">
+                                                <div className="relative z-10">
+                                                    <h4 className="text-slate-500 dark:text-dark-mute text-xs font-bold uppercase tracking-wider">Total Pago</h4>
+                                                    <p className="text-2xl font-bold text-slate-800 dark:text-white mt-1">
+                                                        {faturas.filter(f => f.moradorId === currentUserId && f.status === 'Pago').reduce((acc, f) => acc + Number(f.valor), 0).toFixed(2)}€
+                                                    </p>
+                                                </div>
+                                                <CheckCircle className="absolute right-4 bottom-4 text-green-100 dark:text-green-900/20" size={64} />
+                                            </div>
+                                        </div>
+
+                                        <div className="bg-white dark:bg-dark-surface rounded-xl shadow-sm border border-slate-100 dark:border-dark-border overflow-hidden flex-1 flex flex-col transition-colors">
+                                            <div className="p-6 border-b border-slate-100 dark:border-dark-border flex flex-col md:flex-row justify-between items-center gap-4">
+                                                <div>
+                                                    <h3 className="font-bold text-lg text-slate-800 dark:text-white">Minhas Faturas</h3>
+                                                    <p className="text-sm text-slate-500 dark:text-dark-mute">Consulte as suas despesas e faturas emitidas</p>
+                                                </div>
+                                            </div>
+                                            <div className="overflow-x-auto flex-1">
+                                                <table className="w-full text-sm text-left">
+                                                    <thead className="bg-slate-50 dark:bg-dark-bg text-slate-500 dark:text-slate-400 font-medium border-b border-slate-100 dark:border-dark-border">
+                                                        <tr>
+                                                            <th className="px-6 py-4">Data Emissão</th>
+                                                            <th className="px-6 py-4">Categoria</th>
+                                                            <th className="px-6 py-4">Vencimento</th>
+                                                            <th className="px-6 py-4 text-right">Valor</th>
+                                                            <th className="px-6 py-4 text-center">Estado</th>
+                                                            <th className="px-6 py-4 text-center">Ações</th>
+                                                        </tr>
+                                                    </thead>
+                                                    <tbody className="divide-y divide-slate-100 dark:divide-dark-border">
+                                                        {faturas.filter(f => f.moradorId === currentUserId).length === 0 ? (
+                                                            <tr>
+                                                                <td colSpan="6" className="px-6 py-8 text-center text-slate-500 dark:text-slate-400">
+                                                                    Nenhuma fatura encontrada.
+                                                                </td>
+                                                            </tr>
+                                                        ) : (
+                                                            faturas.filter(f => f.moradorId === currentUserId).map((fatura) => (
+                                                                <tr key={fatura.id} className="hover:bg-slate-50 dark:hover:bg-dark-bg transition-colors">
+                                                                    <td className="px-6 py-4 text-slate-600 dark:text-slate-400">{fatura.dataEmissao}</td>
+                                                                    <td className="px-6 py-4 font-medium text-slate-800 dark:text-white">{fatura.categoria}</td>
+                                                                    <td className="px-6 py-4 text-slate-600 dark:text-slate-400">{fatura.dataVencimento}</td>
+                                                                    <td className="px-6 py-4 text-right font-medium text-slate-800 dark:text-white">{Number(fatura.valor).toFixed(2)}€</td>
+                                                                    <td className="px-6 py-4 text-center"><Badge status={fatura.status} /></td>
+                                                                    <td className="px-6 py-4 text-center">
+                                                                        {fatura.status === 'Pendente' ? (
+                                                                            <button
+                                                                                onClick={() => handlePayFatura(fatura)}
+                                                                                className="bg-blue-600 text-white px-4 py-1.5 rounded-lg text-xs font-bold hover:bg-blue-700 transition-colors shadow-sm"
+                                                                            >
+                                                                                Pagar
+                                                                            </button>
+                                                                        ) : fatura.status === 'Em Validação' ? (
+                                                                            <span className="text-orange-500 text-xs font-bold flex items-center justify-center gap-1">
+                                                                                <Clock size={14} /> Em Validação
+                                                                            </span>
+                                                                        ) : (
+                                                                            <span className="text-slate-400 text-xs font-bold flex items-center justify-center gap-1">
+                                                                                <CheckCircle size={14} /> Pago
+                                                                            </span>
+                                                                        )}
+                                                                    </td>
+                                                                </tr>
+                                                            ))
+                                                        )}
+                                                    </tbody>
+                                                </table>
+                                            </div>
+                                        </div>
+                                    </div>
+                                )}
 
                                 {/* --- FINANCES --- */}
                                 {/* --- FINANCES --- */}
@@ -1911,7 +2236,10 @@
                                                                     {item.type === 'income' ? '+' : '-'}{Number(item.amount).toFixed(2)}€
                                                                 </td>
                                                                 <td className="px-6 py-4 text-center">
-                                                                    <button onClick={() => showNotification(`Recibo de ${item.category} descarregado.`, 'success')} className="text-slate-400 hover:text-blue-600 dark:hover:text-blue-400 transition-colors" title="Descarregar Recibo">
+                                                                    <button onClick={() => {
+                                                                        showNotification(`Recibo de ${item.category} descarregado.`, 'success');
+                                                                        sendSystemNotification(`Recibo de ${item.category} descarregado.`, 'info', currentUserId);
+                                                                    }} className="text-slate-400 hover:text-blue-600 dark:hover:text-blue-400 transition-colors" title="Descarregar Recibo">
                                                                         <FileText size={16} />
                                                                     </button>
                                                                 </td>
@@ -2099,6 +2427,35 @@
                             </form>
                         </Modal>
 
+                        {/* Emitir Fatura Modal */}
+                        <Modal isOpen={activeModal === 'emitir_fatura'} onClose={handleCloseModal} title="Emitir Nova Fatura">
+                            <form onSubmit={handleSaveFatura}>
+                                <div className="mb-4">
+                                    <label className="block text-sm font-medium text-slate-700 dark:text-slate-300 mb-1">Condómino</label>
+                                    <select 
+                                        name="moradorId" 
+                                        value={formData.moradorId || ''} 
+                                        onChange={handleInputChange}
+                                        className="w-full px-4 py-2 border border-slate-300 dark:border-dark-border rounded-lg bg-white dark:bg-dark-card text-slate-900 dark:text-white focus:ring-2 focus:ring-blue-500"
+                                        required
+                                    >
+                                        <option value="">Selecione um morador...</option>
+                                        {residents.map(r => (
+                                            <option key={r.id} value={r.id}>{r.unit} - {r.name}</option>
+                                        ))}
+                                    </select>
+                                </div>
+                                <div className="grid grid-cols-2 gap-4">
+                                    <InputGroup label="Categoria" name="categoria" value={formData.categoria || 'Quotas'} onChange={handleInputChange} options={[{value: 'Quotas', label: 'Quotas'}, {value: 'Luz', label: 'Luz'}, {value: 'Água', label: 'Água'}, {value: 'Aluguer', label: 'Aluguer'}, {value: 'Manutenção', label: 'Manutenção'}, {value: 'Outros', label: 'Outros'}]} />
+                                    <InputGroup label="Valor (€)" type="number" name="valor" value={formData.valor || ''} onChange={handleInputChange} placeholder="0.00" required />
+                                </div>
+                                <InputGroup label="Data Vencimento" type="date" name="dataVencimento" value={formData.dataVencimento || ''} onChange={handleInputChange} required />
+                                <button type="submit" className="w-full bg-blue-600 hover:bg-blue-700 text-white font-bold py-3 rounded-lg mt-4 flex justify-center gap-2 transition-colors">
+                                    <FileText size={20} /> Emitir Fatura
+                                </button>
+                            </form>
+                        </Modal>
+
                         {/* Finance Modal */}
                         <Modal isOpen={activeModal === 'finance'} onClose={handleCloseModal} title="Registar Movimento Financeiro">
                             <form onSubmit={handleSaveFinance}>
diff --git a/test_nif.js b/test_nif.js
new file mode 100644
index 0000000..8e79801
--- /dev/null
+++ b/test_nif.js
@@ -0,0 +1,15 @@
+function validarNIF(nif) {
+    nif = nif.replace(/\s+/g, '');
+    if (!/^\d{9}$/.test(nif)) return false;
+    if (nif.charAt(0) === '0') return false;
+    let soma = 0;
+    for (let i = 0; i < 8; i++) {
+        soma += parseInt(nif.charAt(i), 10) * (9 - i);
+    }
+    const resto = soma % 11;
+    const digitoControlo = (resto === 0 || resto === 1) ? 0 : (11 - resto);
+    return digitoControlo === parseInt(nif.charAt(8), 10);
+}
+console.log(validarNIF('509442013')); // valid NIF (e.g. some company)
+console.log(validarNIF('213340058')); // valid random
+console.log(validarNIF('200000000')); // invalid