diff --git a/server/api/auth/login.post.ts b/server/api/auth/login.post.ts
index 2004b14..8dc90c4 100644
--- a/server/api/auth/login.post.ts
+++ b/server/api/auth/login.post.ts
@@ -16,11 +16,16 @@ export default defineEventHandler(async (event) => {
     const { codeVerifier, codeChallenge, state } = await generatePkce()
     const returnTo = body.data.returnTo ?? '/portal/painel'
 
-    await savePkceState(state, {
-        codeVerifier,
-        returnTo,
-        createdAt: Date.now(),
-    })
+    try {
+        await savePkceState(state, {
+            codeVerifier,
+            returnTo,
+            createdAt: Date.now(),
+        })
+    } catch (err) {
+        console.error('[auth/login] falha ao salvar estado PKCE (Redis indisponível?):', (err as Error).message)
+        throw createError({ statusCode: 503, statusMessage: 'Serviço temporariamente indisponível. Tente novamente em instantes.' })
+    }
 
     const redirectUri = callbackUrlFromEvent(event)
     const authUrl = buildAuthUrl({
diff --git a/server/api/proxy/[...path].ts b/server/api/proxy/[...path].ts
index bb915bf..88a6c86 100644
--- a/server/api/proxy/[...path].ts
+++ b/server/api/proxy/[...path].ts
@@ -97,6 +97,9 @@ export default defineEventHandler(async (event) => {
             setResponseHeader(event, 'content-type', 'application/json; charset=utf-8')
             return body
         }
-        throw err
+
+        // Erro de rede (backend inacessível — ECONNREFUSED, timeout, etc.)
+        console.error(`[proxy] backend inacessível: ${url}`, (err as Error).message)
+        throw createError({ statusCode: 503, statusMessage: 'Sistema temporariamente indisponível.' })
     }
 })
diff --git a/src/error.vue b/src/error.vue
new file mode 100644
index 0000000..f7235f1
--- /dev/null
+++ b/src/error.vue
@@ -0,0 +1,58 @@
+<script setup>
+const props = defineProps({
+    error: {
+        type: Object,
+        default: () => ({}),
+    },
+})
+
+const is404 = computed(() => props.error?.statusCode === 404)
+
+function voltar() {
+    clearError({ redirect: '/' })
+}
+</script>
+
+<template>
+    <div class="min-h-screen bg-slate-50 dark:bg-slate-950 flex flex-col items-center justify-center px-4">
+        <div class="w-full max-w-md text-center">
+
+            <div class="w-20 h-20 mx-auto mb-6 rounded-2xl flex items-center justify-center"
+                :class="is404 ? 'bg-slate-100 dark:bg-slate-800' : 'bg-amber-50 dark:bg-amber-900/20'">
+                <svg v-if="is404" xmlns="http://www.w3.org/2000/svg" class="w-10 h-10 text-slate-400 dark:text-slate-500" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="1.5" aria-hidden="true">
+                    <path stroke-linecap="round" stroke-linejoin="round" d="M9.879 7.519c1.171-1.025 3.071-1.025 4.242 0 1.172 1.025 1.172 2.687 0 3.712-.203.179-.43.326-.67.442-.745.361-1.45.999-1.45 1.827v.75M21 12a9 9 0 1 1-18 0 9 9 0 0 1 18 0Zm-9 5.25h.008v.008H12v-.008Z" />
+                </svg>
+                <svg v-else xmlns="http://www.w3.org/2000/svg" class="w-10 h-10 text-amber-500 dark:text-amber-400" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="1.5" aria-hidden="true">
+                    <path stroke-linecap="round" stroke-linejoin="round" d="M11.42 15.17 17.25 21A2.652 2.652 0 0 0 21 17.25l-5.877-5.877M11.42 15.17l2.496-3.03c.317-.384.74-.626 1.208-.766M11.42 15.17l-4.655 5.653a2.548 2.548 0 1 1-3.586-3.586l6.837-5.63m5.108-.233c.55-.164 1.163-.188 1.743-.14a4.5 4.5 0 0 0 4.486-6.336l-3.276 3.277a3.004 3.004 0 0 1-2.25-2.25l3.276-3.276a4.5 4.5 0 0 0-6.336 4.486c.091 1.076-.071 2.264-.904 2.95l-.102.085m-1.745 1.437L5.909 7.5H4.5L2.25 3.75l1.5-1.5L7.5 4.5v1.409l4.26 4.26m-1.745 1.437 1.745-1.437m6.615 8.206L15.75 15.75M4.867 19.125h.008v.008h-.008v-.008Z" />
+                </svg>
+            </div>
+
+            <h1 class="text-2xl font-bold text-slate-800 dark:text-slate-100 mb-3">
+                {{ is404 ? 'Página não encontrada' : 'Portal temporariamente indisponível' }}
+            </h1>
+
+            <p class="text-slate-500 dark:text-slate-400 text-sm leading-relaxed mb-8">
+                <template v-if="is404">
+                    O endereço que você acessou não existe ou foi movido.
+                    Verifique o link e tente novamente.
+                </template>
+                <template v-else>
+                    Estamos realizando manutenção ou enfrentando uma instabilidade momentânea.
+                    Aguarde alguns minutos e tente novamente. Se o problema persistir,
+                    entre em contato com a prefeitura.
+                </template>
+            </p>
+
+            <button
+                class="inline-flex items-center gap-2 px-6 py-3 rounded-xl bg-primary text-white font-semibold text-sm hover:bg-primary/90 transition-colors focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-primary"
+                @click="voltar"
+            >
+                <svg xmlns="http://www.w3.org/2000/svg" class="w-4 h-4" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="2" aria-hidden="true">
+                    <path stroke-linecap="round" stroke-linejoin="round" d="M10.5 19.5 3 12m0 0 7.5-7.5M3 12h18" />
+                </svg>
+                {{ is404 ? 'Ir para a página inicial' : 'Tentar novamente' }}
+            </button>
+
+        </div>
+    </div>
+</template>
diff --git a/src/pages/portal/debitos.vue b/src/pages/portal/debitos.vue
index 602ab98..fdf8ab0 100644
--- a/src/pages/portal/debitos.vue
+++ b/src/pages/portal/debitos.vue
@@ -108,6 +108,7 @@ function getSegundoNome(texto) {
                             size="small"
                             show-gridlines
                             selection-mode="multiple"
+                            :is-row-selectable="({ data }) => data.codigoEstadoConta === 1"
                             scrollable
                             class="mt-2"
                         >
@@ -196,7 +197,7 @@ function getSegundoNome(texto) {
                             :loading="isLoadingExtrato"
                             @click="gerarExtratoPdf(false)"
                         />
-                        <Button
+<Button
                             v-if="temSelecionado"
                             label="Imprimir Selecionados"
                             icon="pi pi-print"
diff --git a/src/pages/portal/guias.vue b/src/pages/portal/guias.vue
index 4ff4c9e..7dd8ccf 100644
--- a/src/pages/portal/guias.vue
+++ b/src/pages/portal/guias.vue
@@ -60,12 +60,12 @@ function aplicarFiltros() {
         </div>
 
         <div class="bg-white dark:bg-slate-800 rounded-xl border border-slate-200 dark:border-slate-700 p-4 space-y-4">
-            <div class="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 gap-4">
-                <div>
+            <div class="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-4 gap-4">
+                <div class="lg:col-span-2">
                     <label class="block text-xs font-semibold text-slate-500 uppercase mb-1.5">Nº Guia</label>
                     <InputText v-model="filtro.numeroGuia" class="w-full" size="small" />
                 </div>
-                <div>
+                <div class="lg:col-span-2">
                     <label class="block text-xs font-semibold text-slate-500 uppercase mb-1.5">Status</label>
                     <Select
                         v-model="filtro.status"
@@ -79,26 +79,26 @@ function aplicarFiltros() {
                     />
                 </div>
                 <div>
-                    <label class="block text-xs font-semibold text-slate-500 uppercase mb-1.5">Emissão (início)</label>
+                    <label class="block text-xs font-semibold text-slate-500 uppercase mb-1.5">Emissão início</label>
                     <DatePicker v-model="filtro.dataEmissaoInicio" show-icon class="w-full" size="small" date-format="dd/mm/yy" />
                 </div>
                 <div>
-                    <label class="block text-xs font-semibold text-slate-500 uppercase mb-1.5">Emissão (fim)</label>
+                    <label class="block text-xs font-semibold text-slate-500 uppercase mb-1.5">Emissão fim</label>
                     <DatePicker v-model="filtro.dataEmissaoFim" show-icon class="w-full" size="small" date-format="dd/mm/yy" />
                 </div>
                 <div>
-                    <label class="block text-xs font-semibold text-slate-500 uppercase mb-1.5">Vencimento (início)</label>
+                    <label class="block text-xs font-semibold text-slate-500 uppercase mb-1.5">Vencimento início</label>
                     <DatePicker v-model="filtro.dataVencimentoInicio" show-icon class="w-full" size="small" date-format="dd/mm/yy" />
                 </div>
                 <div>
-                    <label class="block text-xs font-semibold text-slate-500 uppercase mb-1.5">Vencimento (fim)</label>
+                    <label class="block text-xs font-semibold text-slate-500 uppercase mb-1.5">Vencimento fim</label>
                     <DatePicker v-model="filtro.dataVencimentoFim" show-icon class="w-full" size="small" date-format="dd/mm/yy" />
                 </div>
-                <div>
+                <div class="lg:col-span-2">
                     <label class="block text-xs font-semibold text-slate-500 uppercase mb-1.5">Valor mínimo</label>
                     <InputNumber v-model="filtro.valorMinimo" mode="currency" currency="BRL" locale="pt-BR" class="w-full" size="small" />
                 </div>
-                <div>
+                <div class="lg:col-span-2">
                     <label class="block text-xs font-semibold text-slate-500 uppercase mb-1.5">Valor máximo</label>
                     <InputNumber v-model="filtro.valorMaximo" mode="currency" currency="BRL" locale="pt-BR" class="w-full" size="small" />
                 </div>
diff --git a/src/pages/servicos/certidao.vue b/src/pages/servicos/certidao.vue
index 9e108b4..cfc3c8b 100644
--- a/src/pages/servicos/certidao.vue
+++ b/src/pages/servicos/certidao.vue
@@ -3,6 +3,7 @@ import { ref, computed, watch } from 'vue'
 import { z } from 'zod'
 import { useAuth } from '@/composables/useAuth'
 import { certidaoService } from '@/services/certidaoService'
+import { validarCpf, validarCnpj } from '@/utils/formatador'
 
 const router = useRouter()
 const route = useRoute()
@@ -24,6 +25,7 @@ const carregandoModelos = ref(false)
 const carregandoConsulta = ref(false)
 const carregandoEmissao = ref(false)
 const resultado = ref(null)
+const certidaoEmitida = ref(null)
 const mensagemErro = ref('')
 const erros = ref({})
 
@@ -37,7 +39,16 @@ const schemaEmissao = z.object({
 
 const docValido = computed(() => {
     const d = documento.value.replace(/\D/g, '')
-    return d.length === 11 || d.length === 14
+    if (d.length === 11) return validarCpf(d)
+    if (d.length === 14) return validarCnpj(d)
+    return false
+})
+
+const docInvalido = computed(() => {
+    const d = documento.value.replace(/\D/g, '')
+    if (d.length === 11) return !validarCpf(d)
+    if (d.length === 14) return !validarCnpj(d)
+    return false
 })
 
 const modeloSelecionado = computed(() =>
@@ -58,7 +69,7 @@ function resetModelos() {
 }
 
 function extrairErro(e) {
-    return e?.data?.description ?? e?.data?.message ?? e?.statusMessage ?? null
+    return e?.data?.description ?? e?.data?.data?.description ?? e?.statusMessage ?? null
 }
 
 async function carregarModelos() {
@@ -147,8 +158,21 @@ async function emitir() {
         const a = document.createElement('a')
         a.href = url
         a.download = `certidao-${slug}-${documento.value.replace(/\D/g, '')}.pdf`
+        document.body.appendChild(a)
         a.click()
-        URL.revokeObjectURL(url)
+        document.body.removeChild(a)
+        setTimeout(() => URL.revokeObjectURL(url), 1000)
+        if (isAuthenticated.value || route.query.from === 'portal') {
+            router.push('/portal/certidoes')
+        } else {
+            certidaoEmitida.value = {
+                titulo: modeloSelecionado.value?.titulo,
+                finalidade: finalidade.value.trim(),
+                validade: validadeLabel.value,
+                nomeContribuinte: resultado.value?.nomeContribuinte ?? documento.value,
+            }
+            etapa.value = 'sucesso'
+        }
     } catch (e) {
         mensagemErro.value = extrairErro(e) ?? 'Erro ao gerar o PDF. Tente novamente.'
     } finally {
@@ -201,6 +225,10 @@ function reiniciar() {
                     :disabled="isAuthenticated"
                     @keyup.enter="consultar"
                 />
+                <p v-if="docInvalido && !isAuthenticated" class="mt-1.5 text-xs text-red-600 dark:text-red-400 flex items-center gap-1.5">
+                    <i class="pi pi-exclamation-circle" aria-hidden="true" />
+                    CPF ou CNPJ inválido.
+                </p>
                 <p v-if="isAuthenticated" class="mt-1.5 text-xs text-slate-500 dark:text-slate-400 flex items-start gap-1.5">
                     <i class="pi pi-info-circle text-xs text-primary mt-0.5 shrink-0" aria-hidden="true" />
                     <span>Logado como <strong class="text-slate-700 dark:text-slate-200">{{ nomeUsuario }}</strong> — documento bloqueado para segurança.</span>
@@ -332,5 +360,61 @@ function reiniciar() {
             </div>
         </div>
 
+        <div v-else-if="etapa === 'sucesso'" class="space-y-4">
+
+            <div class="bg-white dark:bg-slate-800 rounded-2xl border border-emerald-200 dark:border-emerald-700/50 p-8 flex flex-col items-center text-center gap-4">
+                <div class="w-16 h-16 bg-emerald-100 dark:bg-emerald-900/30 rounded-2xl flex items-center justify-center">
+                    <i class="pi pi-check-circle text-emerald-600 dark:text-emerald-400 text-3xl" aria-hidden="true" />
+                </div>
+                <div>
+                    <p class="text-lg font-bold text-slate-800 dark:text-slate-100">Certidão emitida com sucesso!</p>
+                    <p class="text-sm text-slate-500 dark:text-slate-400 mt-1">
+                        O PDF foi baixado automaticamente para o seu dispositivo.
+                    </p>
+                </div>
+            </div>
+
+            <div class="bg-white dark:bg-slate-800 rounded-2xl border border-slate-200 dark:border-slate-700 p-6 space-y-3">
+                <p class="text-xs font-semibold text-slate-500 dark:text-slate-400 uppercase tracking-wide">Detalhes da certidão emitida</p>
+                <div class="space-y-2">
+                    <div class="flex justify-between gap-4">
+                        <span class="text-sm text-slate-500 dark:text-slate-400">Contribuinte</span>
+                        <span class="text-sm font-medium text-slate-800 dark:text-slate-100 text-right">{{ certidaoEmitida?.nomeContribuinte }}</span>
+                    </div>
+                    <div class="flex justify-between gap-4">
+                        <span class="text-sm text-slate-500 dark:text-slate-400">Modelo</span>
+                        <span class="text-sm font-medium text-slate-800 dark:text-slate-100 text-right">{{ certidaoEmitida?.titulo }}</span>
+                    </div>
+                    <div v-if="certidaoEmitida?.finalidade" class="flex justify-between gap-4">
+                        <span class="text-sm text-slate-500 dark:text-slate-400">Finalidade</span>
+                        <span class="text-sm font-medium text-slate-800 dark:text-slate-100 text-right">{{ certidaoEmitida.finalidade }}</span>
+                    </div>
+                    <div class="flex justify-between gap-4">
+                        <span class="text-sm text-slate-500 dark:text-slate-400">Validade</span>
+                        <span class="text-sm font-medium text-slate-800 dark:text-slate-100 text-right">{{ certidaoEmitida?.validade }}</span>
+                    </div>
+                </div>
+            </div>
+
+            <div class="flex gap-3">
+                <Button
+                    label="Emitir nova certidão"
+                    severity="secondary"
+                    icon="pi pi-refresh"
+                    outlined
+                    class="flex-1"
+                    @click="reiniciar"
+                />
+                <Button
+                    label="Voltar aos serviços"
+                    icon="pi pi-home"
+                    class="flex-1"
+                    severity="secondary"
+                    @click="router.push('/servicos')"
+                />
+            </div>
+
+        </div>
+
     </div>
 </template>
diff --git a/src/pages/servicos/iptu.vue b/src/pages/servicos/iptu.vue
index 23fc7e4..6fc71a6 100644
--- a/src/pages/servicos/iptu.vue
+++ b/src/pages/servicos/iptu.vue
@@ -37,7 +37,7 @@ async function consultar() {
             ? await iptuService.consultarPorDocumento(documento.value)
             : await iptuService.consultarPorInscricao(inscricao.value)
 
-        imoveis.value = res.data ?? []
+        imoveis.value = res.data?.content ?? res.data ?? []
         if (imoveis.value.length === 1) imovelSelecionado.value = imoveis.value[0]
         etapa.value = 'resultado'
     } catch (e) {
@@ -188,7 +188,19 @@ function formatarMoeda(valor) {
 
         <div v-else-if="etapa === 'resultado'" class="space-y-4">
 
-            <div v-if="imoveis.length > 1" class="bg-white dark:bg-slate-800 rounded-2xl border border-slate-200 dark:border-slate-700 p-6">
+            <div v-if="imoveis.length === 0" class="bg-white dark:bg-slate-800 rounded-2xl border border-slate-200 dark:border-slate-700 p-8 text-center">
+                <div class="w-14 h-14 bg-primary/10 dark:bg-primary/20 rounded-full flex items-center justify-center mx-auto mb-4">
+                    <i class="pi pi-search text-primary text-2xl" aria-hidden="true" />
+                </div>
+                <p class="text-base font-semibold text-slate-800 dark:text-slate-100 mb-1">Nenhum imóvel encontrado</p>
+                <p class="text-sm text-slate-500 dark:text-slate-400">
+                    Não foram encontrados imóveis cadastrados para o
+                    {{ modoConsulta === 'documento' ? 'documento informado' : 'número de inscrição informado' }}.
+                    Verifique os dados e tente novamente.
+                </p>
+            </div>
+
+            <div v-else-if="imoveis.length > 1" class="bg-white dark:bg-slate-800 rounded-2xl border border-slate-200 dark:border-slate-700 p-6">
                 <p class="text-sm font-semibold text-slate-700 dark:text-slate-200 mb-3">
                     {{ imoveis.length }} imóveis encontrados — selecione um
                 </p>
diff --git a/src/utils/formatador.js b/src/utils/formatador.js
index cf2ec8d..c0360ea 100644
--- a/src/utils/formatador.js
+++ b/src/utils/formatador.js
@@ -47,3 +47,30 @@ export function abrirPdf(buf) {
 }
 
 export { formatarMoeda, baixarPdf }
+
+export function validarCpf(cpf) {
+    const d = String(cpf).replace(/\D/g, '')
+    if (d.length !== 11 || /^(\d)\1{10}$/.test(d)) return false
+    const calc = (len) => {
+        let sum = 0
+        for (let i = 0; i < len; i++) sum += parseInt(d[i]) * (len + 1 - i)
+        const r = sum % 11
+        return r < 2 ? 0 : 11 - r
+    }
+    return calc(9) === parseInt(d[9]) && calc(10) === parseInt(d[10])
+}
+
+export function validarCnpj(cnpj) {
+    const d = String(cnpj).replace(/\D/g, '')
+    if (d.length !== 14 || /^(\d)\1{13}$/.test(d)) return false
+    const calc = (len) => {
+        const weights = len === 12
+            ? [5, 4, 3, 2, 9, 8, 7, 6, 5, 4, 3, 2]
+            : [6, 5, 4, 3, 2, 9, 8, 7, 6, 5, 4, 3, 2]
+        let sum = 0
+        for (let i = 0; i < len; i++) sum += parseInt(d[i]) * weights[i]
+        const r = sum % 11
+        return r < 2 ? 0 : 11 - r
+    }
+    return calc(12) === parseInt(d[12]) && calc(13) === parseInt(d[13])
+}