diff --git a/modules/cybercore-app/src/main/java/br/com/cybercore/signer/app/CyberCoreSignerApplication.java b/modules/cybercore-app/src/main/java/br/com/cybercore/signer/app/CyberCoreSignerApplication.java
index 8817b83..3b0831a 100644
--- a/modules/cybercore-app/src/main/java/br/com/cybercore/signer/app/CyberCoreSignerApplication.java
+++ b/modules/cybercore-app/src/main/java/br/com/cybercore/signer/app/CyberCoreSignerApplication.java
@@ -131,12 +131,12 @@ public class CyberCoreSignerApplication {
     private static void printBanner() {
         System.out.println("""
                 ============================================================
-                   ____            _                 ____
-                  / ___| _   _  __| |  ___  _ __    / ___|___   _ __  ___
-                 | |    | | | |/ _` | / _ \\| '__|  | |   / _ \\ | '__|/ _ \\
-                 | |___ | |_| | (_| ||  __/| |     | |__| (_) || |  |  __/
-                  \\____| \\__, |\\__,_| \\___||_|      \\____\\___/ |_|   \\___|
-                         |___/
+                   ____          _                   ____                  \s
+                  / ___| _   _  | |__   ___ _ __    / ___|___  _ __ ___    \s
+                 | |    | | | | | '_ \\ / _ \\ '__|  | |   / _ \\| '__/ _ \\   \s
+                 | |___ | |_| | | |_) |  __/ |     | |__| (_) | | |  __/   \s
+                  \\____| \\__, | |_.__/ \\___|_|      \\____\\___/|_|  \\___|   \s
+                         |___/                                             \s
                                   SIGNER AGENT v0.1.0
                 ============================================================
                 """);
diff --git a/modules/cybercore-core/src/main/java/br/com/cybercore/signer/core/protocol/CcspServer.java b/modules/cybercore-core/src/main/java/br/com/cybercore/signer/core/protocol/CcspServer.java
index 70d1f7b..5e8fd12 100644
--- a/modules/cybercore-core/src/main/java/br/com/cybercore/signer/core/protocol/CcspServer.java
+++ b/modules/cybercore-core/src/main/java/br/com/cybercore/signer/core/protocol/CcspServer.java
@@ -990,7 +990,8 @@ public class CcspServer {
 
         exchange.getResponseHeaders().set("Access-Control-Allow-Origin", origin);
         exchange.getResponseHeaders().set("Access-Control-Allow-Methods", "GET, POST, OPTIONS");
-        exchange.getResponseHeaders().set("Access-Control-Allow-Headers", "Content-Type, Authorization, X-CyberCore-AppId, X-CyberCore-Nonce");
+        exchange.getResponseHeaders().set("Access-Control-Allow-Headers", "Content-Type, Authorization, X-CyberCore-AppId, X-CyberCore-Nonce, Accept");
+        exchange.getResponseHeaders().set("Access-Control-Allow-Private-Network", "true");
         exchange.getResponseHeaders().set("Access-Control-Max-Age", "86400");
 
         if ("OPTIONS".equalsIgnoreCase(exchange.getRequestMethod())) {
diff --git a/modules/cybercore-ui/src/main/java/br/com/cybercore/signer/ui/CyberCoreDesktopApplication.java b/modules/cybercore-ui/src/main/java/br/com/cybercore/signer/ui/CyberCoreDesktopApplication.java
index 081e0c3..b8b9f0a 100644
--- a/modules/cybercore-ui/src/main/java/br/com/cybercore/signer/ui/CyberCoreDesktopApplication.java
+++ b/modules/cybercore-ui/src/main/java/br/com/cybercore/signer/ui/CyberCoreDesktopApplication.java
@@ -96,6 +96,7 @@ public class CyberCoreDesktopApplication extends Application {
 
         // Inicializa serviços centrais reais da plataforma
         this.certificateManager = CertificateManager.createDefault();
+        this.signingService = new SigningService(this.certificateManager);
 
         if (developmentMode) {
             logger.info("Modo de desenvolvimento ativo (utilizando certificados reais da máquina).");
diff --git a/modules/cybercore-ui/src/main/java/br/com/cybercore/signer/ui/view/SignaturePromptDialog.java b/modules/cybercore-ui/src/main/java/br/com/cybercore/signer/ui/view/SignaturePromptDialog.java
index 5c6dc79..6e3be24 100644
--- a/modules/cybercore-ui/src/main/java/br/com/cybercore/signer/ui/view/SignaturePromptDialog.java
+++ b/modules/cybercore-ui/src/main/java/br/com/cybercore/signer/ui/view/SignaturePromptDialog.java
@@ -57,21 +57,27 @@ public class SignaturePromptDialog {
 
     private void initLayout(String appName, String origin, ManagedCertificate cert, SigningContext context,
                             String documentName, String documentType, boolean isAuthentication) {
-        VBox root = new VBox(18);
+        VBox root = new VBox(16);
         root.getStyleClass().add("dialog-container");
-        root.setPrefWidth(540);
+        root.setPadding(new Insets(20, 24, 20, 24));
+        root.setPrefWidth(560);
 
-        HBox headerBox = new HBox(12);
+        HBox headerBox = new HBox(14);
         headerBox.setAlignment(Pos.CENTER_LEFT);
 
-        VBox titleBox = new VBox(2);
-        Label header = new Label(isAuthentication ? "SOLICITAÇÃO DE LOGIN DIGITAL" : "SOLICITAÇÃO DE ASSINATURA");
+        VBox titleBox = new VBox(3);
+        HBox.setHgrow(titleBox, Priority.ALWAYS);
+        titleBox.setMaxWidth(Double.MAX_VALUE);
+
+        Label header = new Label(isAuthentication ? "SOLICITAÇÃO DE LOGIN" : "SOLICITAÇÃO DE ASSINATURA");
         header.getStyleClass().add("dialog-header");
 
         Label desc = new Label(isAuthentication
                 ? "Uma aplicação web está solicitando autenticação de identidade com seu Certificado Digital ICP-Brasil."
                 : "Uma aplicação web está solicitando a assinatura digital de um documento.");
         desc.getStyleClass().add("brand-subtitle");
+        desc.setWrapText(true);
+        desc.setMaxWidth(480);
         titleBox.getChildren().addAll(header, desc);
 
         headerBox.getChildren().addAll(
@@ -145,7 +151,8 @@ public class SignaturePromptDialog {
                         "O PIN deste dispositivo é gerenciado diretamente pelo driver nativo (SafeSign / Windows Security). " +
                         "Caso o token ainda não esteja autenticado, a janela segura do driver será aberta automaticamente."
                 );
-                winDesc.setStyle("-fx-text-fill: -fx-text-secondary; -fx-font-size: 12px;");
+                winDesc.getStyleClass().add("dialog-subtitle");
+                winDesc.setStyle("-fx-font-size: 12px;");
                 winDesc.setWrapText(true);
 
                 winBox.getChildren().addAll(winTitle, winDesc);
@@ -177,6 +184,7 @@ public class SignaturePromptDialog {
                         if (nowVisible) {
                             cbSavePin.setSelected(true);
                         }
+                        stage.sizeToScene();
                     });
 
                     rememberedBox.getChildren().addAll(rememberedBadge, btnChangePin);
@@ -184,25 +192,26 @@ public class SignaturePromptDialog {
                 } else {
                     VBox inputWrapper = new VBox(8);
                     Label pinPromptLabel = new Label("Informe o PIN do dispositivo para autorizar a chave privada:");
-                    pinPromptLabel.setStyle("-fx-text-fill: -fx-text-secondary; -fx-font-size: 12px;");
+                    pinPromptLabel.getStyleClass().add("dialog-subtitle");
+                    pinPromptLabel.setStyle("-fx-font-size: 12px;");
 
                     cbSavePin.setSelected(false);
                     inputWrapper.getChildren().addAll(pinPromptLabel, pinField, cbSavePin);
                     pinContainer.getChildren().add(inputWrapper);
                 }
             }
-
-            detailsBox.getChildren().add(pinContainer);
         }
 
         // Label de Alerta de Validação
         Label validationLabel = new Label();
         validationLabel.setStyle("-fx-text-fill: #f87171; -fx-font-size: 12px;");
         validationLabel.setVisible(false);
+        validationLabel.setManaged(false);
 
         // Botões de Ação
         HBox actionsRow = new HBox(12);
         actionsRow.setAlignment(Pos.CENTER_RIGHT);
+        actionsRow.setPadding(new Insets(4, 0, 0, 0));
 
         Button btnCancel = new Button("Cancelar");
         btnCancel.getStyleClass().add("btn-cancel");
@@ -222,6 +231,8 @@ public class SignaturePromptDialog {
                 if (!hasStoredPin && !pinProvided) {
                     validationLabel.setText("Atenção: O PIN do token é obrigatório para assinar via PKCS#11.");
                     validationLabel.setVisible(true);
+                    validationLabel.setManaged(true);
+                    stage.sizeToScene();
                     pinField.requestFocus();
                     return;
                 }
@@ -242,12 +253,18 @@ public class SignaturePromptDialog {
 
         actionsRow.getChildren().addAll(btnCancel, btnConfirm);
 
-        root.getChildren().addAll(headerBox, detailsBox, validationLabel, actionsRow);
+        if (isA3) {
+            root.getChildren().addAll(headerBox, detailsBox, pinContainer, validationLabel, actionsRow);
+        } else {
+            root.getChildren().addAll(headerBox, detailsBox, validationLabel, actionsRow);
+        }
 
         Scene scene = new Scene(root);
         ThemeManager.applyTheme(scene);
 
         stage.setScene(scene);
+        stage.sizeToScene();
+        stage.centerOnScreen();
         stage.setOnCloseRequest(e -> approvalFuture.complete(false));
     }
 
@@ -263,6 +280,8 @@ public class SignaturePromptDialog {
     }
 
     public CompletableFuture<Boolean> showAndAwait() {
+        stage.sizeToScene();
+        stage.centerOnScreen();
         stage.show();
         stage.toFront();
         return approvalFuture;
diff --git a/modules/cybercore-ui/src/main/resources/styles/theme.css b/modules/cybercore-ui/src/main/resources/styles/theme.css
index 0588ffd..a90da8e 100644
--- a/modules/cybercore-ui/src/main/resources/styles/theme.css
+++ b/modules/cybercore-ui/src/main/resources/styles/theme.css
@@ -6,6 +6,7 @@
 .root {
     -fx-font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
     -fx-font-size: 13px;
+    -fx-text-secondary: #64748b;
 }
 
 /* ==========================================================================
@@ -17,6 +18,7 @@
     -fx-background: #f1f5f9;
     -fx-control-inner-background: #ffffff;
     -fx-text-fill: #0f172a;
+    -fx-text-secondary: #64748b;
 }
 
 .theme-light.cyber-root,
@@ -438,6 +440,7 @@
     -fx-background: #0b0f17;
     -fx-control-inner-background: #131c2e;
     -fx-text-fill: #f1f5f9;
+    -fx-text-secondary: #94a3b8;
 }
 
 .theme-dark.cyber-root,
@@ -855,7 +858,7 @@
 
 /* Botões Base e Proteção contra Truncamento com Reticências */
 .button {
-    -fx-min-width: -fx-pref-size;
+    -fx-min-width: -1;
 }
 
 .btn-primary {
@@ -865,7 +868,6 @@
     -fx-padding: 8px 18px;
     -fx-background-radius: 6px;
     -fx-cursor: hand;
-    -fx-min-width: -fx-pref-size;
     -fx-alignment: center;
     -fx-effect: dropshadow(three-pass-box, rgba(2, 132, 199, 0.25), 4, 0, 0, 1);
 }
@@ -880,7 +882,6 @@
     -fx-font-weight: bold;
     -fx-padding: 8px 18px;
     -fx-background-radius: 6px;
-    -fx-min-width: -fx-pref-size;
     -fx-alignment: center;
     -fx-cursor: hand;
 }
@@ -910,7 +911,6 @@
     -fx-text-fill: #475569;
     -fx-font-weight: bold;
     -fx-padding: 8px 18px;
-    -fx-min-width: -fx-pref-size;
     -fx-alignment: center;
     -fx-cursor: hand;
 }
@@ -933,14 +933,12 @@
 /* Botões Padronizados para Diálogos e Modais */
 .btn-dialog {
     -fx-min-width: 110px;
-    -fx-pref-width: -fx-pref-size;
     -fx-pref-height: 34px;
     -fx-alignment: center;
 }
 
 .btn-dialog-wide {
     -fx-min-width: 220px;
-    -fx-pref-width: -fx-pref-size;
     -fx-pref-height: 36px;
     -fx-alignment: center;
 }
@@ -949,13 +947,12 @@
 .btn-compact {
     -fx-padding: 5px 12px;
     -fx-font-size: 11.5px;
-    -fx-min-width: -fx-pref-size;
     -fx-alignment: center;
 }
 
 /* Botão de Perigo / Exclusão / Remoção */
 .btn-danger {
-    -fx-background-color: #fee2e2;
+    -fx-background-color: #fee2e8;
     -fx-text-fill: #b91c1c;
     -fx-border-color: #fca5a5;
     -fx-border-radius: 6px;
@@ -965,7 +962,6 @@
     -fx-font-weight: bold;
     -fx-padding: 6px 14px;
     -fx-alignment: center;
-    -fx-min-width: -fx-pref-size;
     -fx-cursor: hand;
 }
 
diff --git a/sdk/demo/index.html b/sdk/demo/index.html
index 6518b4d..0422538 100644
--- a/sdk/demo/index.html
+++ b/sdk/demo/index.html
@@ -667,9 +667,9 @@
           <!-- Configurações do Selo e da Assinatura -->
           <div id="pdfOptionsSection" style="margin-top: 16px; display: none; background: var(--bg-surface); padding: 16px; border-radius: var(--radius-sm); border: 1px solid var(--border-subtle);">
             <h4 style="font-size: 13px; font-weight: 700; color: #fff; margin-bottom: 12px;">🎨 Configurações do Selo Visual</h4>
-            <div style="display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px;">
+            <div style="display: grid; grid-template-columns: minmax(240px, 360px); gap: 14px;">
               <div class="form-group">
-                <label class="form-label">Tema do Selo do Agente:</label>
+                <label class="form-label">Tema do Selo Visual:</label>
                 <select id="pdfSealThemeSelect" class="cert-bar-select">
                   <option value="icp-brasil">ICP-Brasil Institucional (Padrão)</option>
                   <option value="gov-br">Governamental (Gov.br / ITI)</option>
@@ -678,16 +678,6 @@
                   <option value="custom">🎨 Selo Customizado do Designer</option>
                 </select>
               </div>
-
-              <div class="form-group">
-                <label class="form-label">Razão / Motivo da Assinatura:</label>
-                <input type="text" id="pdfReasonInput" value="Documento aprovado e assinado digitalmente" placeholder="Ex: De acordo com os termos">
-              </div>
-
-              <div class="form-group">
-                <label class="form-label">Localização:</label>
-                <input type="text" id="pdfLocationInput" value="Curitiba, PR - Brasil" placeholder="Ex: Brasília, DF">
-              </div>
             </div>
 
             <div style="margin-top: 16px; display: flex; gap: 10px; flex-wrap: wrap;">
@@ -1062,6 +1052,13 @@
         certTypeBadge.textContent = cert.type || 'A1';
         certTypeBadge.className = `badge-tag ${cert.type === 'A3' ? 'badge-a3' : 'badge-a1'}`;
         certValidityText.textContent = `Validade: ${cert.valid_to ? new Date(cert.valid_to).toLocaleDateString() : 'N/D'}`;
+
+        if (pdfStampPicker) {
+          pdfStampPicker.updateSealTheme(null, {
+            signerName: cert.common_name || cert.alias,
+            signerDoc: cert.cpf_cnpj ? `CPF: ${cert.cpf_cnpj}` : (cert.type === 'A3' ? 'Token Físico A3' : 'ICP-Brasil')
+          });
+        }
       } else {
         certTypeBadge.style.display = 'none';
         certValidityText.textContent = '';
@@ -1171,22 +1168,56 @@
       stampPickerMount.style.display = 'block';
       pdfOptionsSection.style.display = 'block';
 
+      const activeCert = currentCertificates.find(c => c.id === selectedCertificateId);
+      const currentThemeVal = pdfSealThemeSelect ? pdfSealThemeSelect.value : 'icp-brasil';
+      const initialTheme = (currentThemeVal === 'custom' && currentCustomSealConfig)
+        ? currentCustomSealConfig
+        : currentThemeVal;
+
+      const rawCertName = activeCert ? (activeCert.common_name || activeCert.alias) : '';
+      const cleanCertName = rawCertName.includes(':') ? rawCertName.split(':')[0].trim() : rawCertName;
+      const initialSignerInfo = activeCert ? {
+        signerName: cleanCertName,
+        signerDoc: activeCert.cpf_cnpj ? `CPF: ${activeCert.cpf_cnpj}` : (activeCert.type === 'A3' ? 'Token Físico A3' : 'ICP-Brasil')
+      } : {
+        signerName: 'Nome do Titular do Certificado',
+        signerDoc: 'CPF: ***.456.789-**'
+      };
+
       if (!pdfStampPicker) {
         pdfStampPicker = new PdfStampPicker({
           container: stampPickerMount,
-          pdfSource: buffer,
+          pdf: buffer,
+          sealTheme: initialTheme,
+          signerInfo: initialSignerInfo,
           initialScale: 1.0,
           onPositionChange: (pos) => {
             console.log('Posição do selo atualizada:', pos);
+          },
+          onSignRequest: () => {
+            btnSignPdfFull.click();
           }
         });
       } else {
+        pdfStampPicker.updateSealTheme(initialTheme, initialSignerInfo);
         pdfStampPicker.loadPdf(buffer);
       }
 
       updateButtonStates();
     }
 
+    // Sincroniza alteração de tema com o selo sobre o PDF
+    pdfSealThemeSelect.addEventListener('change', () => {
+      const themeVal = pdfSealThemeSelect.value;
+      if (pdfStampPicker) {
+        if (themeVal === 'custom' && currentCustomSealConfig) {
+          pdfStampPicker.updateSealTheme(currentCustomSealConfig);
+        } else {
+          pdfStampPicker.updateSealTheme(themeVal);
+        }
+      }
+    });
+
     // Assinatura Completa de PDF (Devolve PDF Assinado Base64)
     btnSignPdfFull.addEventListener('click', async () => {
       btnSignPdfFull.disabled = true;
@@ -1201,13 +1232,11 @@
 
         const signParams = {
           certificateId: selectedCertificateId,
-          pdf: currentPdfBytes,
+          pdf: currentPdfFile || currentPdfBytes,
           page: stampConfig.page,
           x: stampConfig.x,
           y: stampConfig.y,
-          scale: stampConfig.scale,
-          reason: document.getElementById('pdfReasonInput').value || 'Assinado Digitalmente',
-          location: document.getElementById('pdfLocationInput').value || 'Brasil'
+          scale: stampConfig.scale
         };
 
         if (selectedTheme === 'custom' && currentCustomSealConfig) {
@@ -1324,9 +1353,12 @@
       document.getElementById('btnApplySealToPdf').addEventListener('click', () => {
         currentCustomSealConfig = pdfSealDesigner.getConfig();
         pdfSealThemeSelect.value = 'custom';
+        if (pdfStampPicker) {
+          pdfStampPicker.updateSealTheme(currentCustomSealConfig);
+        }
         // Alterna para aba PDF
         document.querySelector('[data-tab="tab-pdf"]').click();
-        alert('Selo customizado selecionado para a assinatura do PDF!');
+        alert('Selo customizado selecionado e aplicado ao posicionador de PDF!');
       });
     }
 
diff --git a/sdk/src/pdf-seal-designer.js b/sdk/src/pdf-seal-designer.js
index 7aee88b..8eeb646 100644
--- a/sdk/src/pdf-seal-designer.js
+++ b/sdk/src/pdf-seal-designer.js
@@ -209,6 +209,9 @@ export class PdfSealDesigner {
         padding: 20px;
         color: #f8fafc;
         font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
+        max-width: 100%;
+        box-sizing: border-box;
+        overflow: hidden;
       }
       .designer-header {
         margin-bottom: 20px;
@@ -227,12 +230,13 @@ export class PdfSealDesigner {
       }
       .designer-body {
         display: grid;
-        grid-template-columns: 1fr 1fr;
+        grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
         gap: 24px;
+        min-width: 0;
       }
       @media (max-width: 860px) {
         .designer-body {
-          grid-template-columns: 1fr;
+          grid-template-columns: minmax(0, 1fr);
         }
       }
       .form-section-title {
@@ -364,12 +368,17 @@ export class PdfSealDesigner {
         display: flex;
         flex-direction: column;
         gap: 16px;
+        min-width: 0;
+        max-width: 100%;
       }
       .preview-card, .json-export-card {
         background: #131c31;
         border: 1px solid #24304f;
         border-radius: 10px;
         padding: 16px;
+        min-width: 0;
+        max-width: 100%;
+        box-sizing: border-box;
       }
       .preview-card h4, .json-export-card h4 {
         font-size: 12px;
@@ -385,9 +394,14 @@ export class PdfSealDesigner {
         align-items: center;
         justify-content: center;
         box-shadow: 0 4px 15px rgba(0,0,0,0.3);
+        max-width: 340px;
+        margin: 0 auto;
+        box-sizing: border-box;
+        overflow: hidden;
       }
       .seal-live-preview-box svg {
         max-width: 100%;
+        width: 100%;
         height: auto;
         display: block;
       }
@@ -426,8 +440,22 @@ export class PdfSealDesigner {
         font-size: 10.5px;
         color: #38bdf8;
         max-height: 180px;
-        overflow: auto;
+        overflow-y: auto;
+        overflow-x: hidden;
         margin: 0;
+        white-space: pre-wrap;
+        word-break: break-all;
+        word-wrap: break-word;
+        max-width: 100%;
+        min-width: 0;
+        box-sizing: border-box;
+      }
+      .theme-json-box code {
+        white-space: pre-wrap;
+        word-break: break-all;
+        word-wrap: break-word;
+        display: block;
+        max-width: 100%;
       }
     `;
     document.head.appendChild(style);
@@ -541,7 +569,7 @@ export class PdfSealDesigner {
 
     let iconGraphic = '';
     if (t.customLogoBase64) {
-      iconGraphic = `<image href="${t.customLogoBase64}" x="12" y="14" width="34" height="34" preserveAspectRatio="xMidYMid meet" />`;
+      iconGraphic = `<image xlink:href="${t.customLogoBase64}" href="${t.customLogoBase64}" x="12" y="14" width="34" height="54" preserveAspectRatio="xMidYMid meet" />`;
     } else {
       switch (t.iconStyle) {
         case 'star':
@@ -578,7 +606,7 @@ export class PdfSealDesigner {
     }
 
     const svg = `
-      <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 82" width="320" height="82" style="border-radius:6px; background:${t.backgroundColor};">
+      <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 320 82" width="320" height="82" style="border-radius:6px; background:${t.backgroundColor};">
         <rect x="1" y="1" width="318" height="80" rx="6" fill="${t.backgroundColor}" stroke="${t.borderColor}" stroke-width="1.5"/>
         <rect x="1" y="1" width="6" height="80" rx="3" fill="${t.primaryColor}"/>
         
@@ -591,13 +619,20 @@ export class PdfSealDesigner {
         <text x="54" y="19" font-family="-apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif" font-size="8.5" font-weight="bold" fill="${t.primaryColor}" letter-spacing="0.3">${t.customHeader || 'DOCUMENTO ASSINADO DIGITALMENTE'}</text>
         <text x="54" y="34" font-family="-apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif" font-size="12" font-weight="bold" fill="${t.textColor}">MARIA DA SILVA</text>
         <text x="54" y="47" font-family="-apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif" font-size="8" fill="#475569">${[docText, extraText].filter(Boolean).join(' • ')}</text>
-        <text x="54" y="58" font-family="-apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif" font-size="8" fill="#475569">${[dateText, 'AC SERPRO v5'].filter(Boolean).join(' • ')}</text>
+        <text x="54" y="58" font-family="-apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif" font-size="8" fill="#475569">${dateText ? `Data: ${dateText}` : ''}</text>
         <text x="54" y="70" font-family="-apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif" font-size="7.5" fill="#64748b">${t.customFooter || 'ICP-Brasil • MP nº 2.200-2/2001'}</text>
       </svg>
     `;
 
     this.previewBox.innerHTML = svg;
-    this.jsonBox.textContent = JSON.stringify(this.getThemeConfig(), null, 2);
+
+    // Na visualização do código, trunca se o Base64 for gigante para preservar performance da UI
+    const displayConfig = { ...this.getThemeConfig() };
+    if (displayConfig.customLogoBase64 && displayConfig.customLogoBase64.length > 100) {
+      const lenKb = (displayConfig.customLogoBase64.length / 1024).toFixed(1);
+      displayConfig.customLogoBase64 = `${displayConfig.customLogoBase64.substring(0, 32)}... [${lenKb} KB]`;
+    }
+    this.jsonBox.textContent = JSON.stringify(displayConfig, null, 2);
   }
 
   /**
@@ -625,6 +660,13 @@ export class PdfSealDesigner {
     };
   }
 
+  /**
+   * Alias conveniente para getThemeConfig().
+   */
+  getConfig() {
+    return this.getThemeConfig();
+  }
+
   /**
    * Carrega um tema para edição.
    */
diff --git a/sdk/src/pdf-stamp-picker.js b/sdk/src/pdf-stamp-picker.js
index 276acd5..cda12da 100644
--- a/sdk/src/pdf-stamp-picker.js
+++ b/sdk/src/pdf-stamp-picker.js
@@ -25,7 +25,11 @@ export class PdfStampPicker {
 
     this.onPositionChange = options.onPositionChange || null;
     this.onSignRequest = options.onSignRequest || null;
-    this.sealTheme = options.sealTheme || null;
+    this.sealTheme = options.sealTheme || 'icp-brasil';
+    this.signerInfo = options.signerInfo || {
+      signerName: 'Nome do Titular do Certificado',
+      signerDoc: 'CPF: ***.456.789-**'
+    };
 
     // Estado interno
     this.pdfDocument = null;
@@ -42,8 +46,8 @@ export class PdfStampPicker {
 
     // Estado do selo
     this.sealScale = options.initialScale || 1.0;
-    this.baseSealWidth = 230; // pixels base no visualizador
-    this.baseSealHeight = 60;
+    this.baseSealWidth = 240; // Proporção 320x82 pt
+    this.baseSealHeight = 61.5;
     this.sealPosX = null; // pixel relativo ao container da folha
     this.sealPosY = null;
     this.isDragging = false;
@@ -98,20 +102,9 @@ export class PdfStampPicker {
             <div class="picker-sheet-wrapper">
               <div class="sheet-container">
                 <canvas class="pdf-canvas"></canvas>
-                <!-- Selo Visual Interativo (Drag & Drop) -->
-                <div class="stamp-overlay" style="display:none;">
-                  <div class="stamp-content">
-                    <div class="stamp-icon-box">
-                      <svg viewBox="0 0 24 24" class="stamp-svg-icon" fill="currentColor">
-                        <path d="M12 1L3 5v6c0 5.55 3.84 10.74 9 12 5.16-1.26 9-6.45 9-12V5l-9-4zm-1 6h2v2h-2V7zm0 4h2v6h-2v-6z"/>
-                      </svg>
-                    </div>
-                    <div class="stamp-info-box">
-                      <div class="stamp-badge-text">ASSINADO DIGITALMENTE • ICP-BRASIL</div>
-                      <div class="stamp-signer-name">NOME DO TITULAR DO CERTIFICADO</div>
-                      <div class="stamp-signer-meta">CPF: ***.456.789-** • VALIDADE JURÍDICA</div>
-                    </div>
-                  </div>
+                <!-- Selo Visual Interativo Oficial (Drag & Drop) -->
+                <div class="stamp-overlay" style="display:none;" title="Clique e arraste para posicionar o selo na folha">
+                  <div class="stamp-svg-container"></div>
                   <div class="stamp-resize-handle" title="Arraste para redimensionar o selo"></div>
                 </div>
               </div>
@@ -208,6 +201,8 @@ export class PdfStampPicker {
     this.payloadCode = this.root.querySelector('.payload-code-box code');
     this.btnCopyPayload = this.root.querySelector('.btn-copy-payload');
     this.btnTriggerSign = this.root.querySelector('.btn-trigger-sign');
+
+    this._renderSealGraphic();
   }
 
   _injectStyles() {
@@ -291,21 +286,22 @@ export class PdfStampPicker {
       }
       .picker-body {
         display: flex;
-        min-height: 520px;
-        height: 600px;
+        min-height: 560px;
+        height: 680px;
       }
       .picker-viewport {
         flex: 1;
         background: #060911;
         overflow: auto;
         position: relative;
-        display: flex;
-        align-items: center;
-        justify-content: center;
-        padding: 24px;
+        padding: 30px;
+        display: block;
+        box-sizing: border-box;
       }
       .picker-sheet-wrapper {
         display: none;
+        margin: 0 auto;
+        width: fit-content;
         box-shadow: 0 12px 35px rgba(0,0,0,0.65);
         border: 1px solid rgba(255,255,255,0.1);
         background: #ffffff;
@@ -322,64 +318,53 @@ export class PdfStampPicker {
       }
       .stamp-overlay {
         position: absolute;
-        width: 230px;
-        height: 60px;
-        border: 2px dashed #0284c7;
-        background: rgba(13, 71, 161, 0.08);
+        width: 240px;
+        height: 61.5px;
+        border: 1.5px solid #0284c7;
+        background: transparent;
         border-radius: 6px;
-        box-shadow: 0 4px 15px rgba(0,0,0,0.25);
+        box-shadow: 0 4px 18px rgba(0,0,0,0.3);
         cursor: grab;
         box-sizing: border-box;
         overflow: hidden;
         z-index: 20;
+        user-select: none;
         transition: box-shadow 0.2s, border-color 0.2s;
       }
+      .stamp-overlay:hover {
+        border-color: #38bdf8;
+        box-shadow: 0 6px 22px rgba(56, 189, 248, 0.4);
+      }
       .stamp-overlay:active {
         cursor: grabbing;
-        border-color: #38bdf8;
-        box-shadow: 0 6px 20px rgba(56, 189, 248, 0.4);
+        border-color: #0ea5e9;
+        box-shadow: 0 8px 26px rgba(14, 165, 233, 0.55);
       }
-      .stamp-content {
+      .stamp-svg-container {
         width: 100%;
         height: 100%;
-        display: flex;
-        align-items: center;
-        padding: 4px 8px;
-        box-sizing: border-box;
-        gap: 8px;
+        display: block;
         pointer-events: none;
       }
-      .stamp-icon-box {
-        width: 34px;
-        height: 34px;
-        color: #0d47a1;
-        flex-shrink: 0;
-      }
-      .stamp-svg-icon {
+      .stamp-svg-container svg {
         width: 100%;
         height: 100%;
+        display: block;
+        border-radius: 6px;
       }
-      .stamp-info-box {
-        display: flex;
-        flex-direction: column;
-        justify-content: center;
-        line-height: 1.15;
+      .stamp-resize-handle {
+        position: absolute;
+        bottom: 0;
+        right: 0;
+        width: 14px;
+        height: 14px;
+        background: linear-gradient(135deg, transparent 50%, #0284c7 50%);
+        cursor: se-resize;
+        z-index: 25;
+        border-bottom-right-radius: 5px;
       }
-      .stamp-badge-text {
-        font-size: 7.5px;
-        font-weight: 800;
-        color: #0d47a1;
-        letter-spacing: 0.3px;
-      }
-      .stamp-signer-name {
-        font-size: 10px;
-        font-weight: 800;
-        color: #0f172a;
-        margin: 1px 0;
-      }
-      .stamp-signer-meta {
-        font-size: 7.5px;
-        color: #475569;
+      .stamp-resize-handle:hover {
+        background: linear-gradient(135deg, transparent 50%, #38bdf8 50%);
       }
       .picker-empty-state {
         text-align: center;
@@ -676,14 +661,16 @@ export class PdfStampPicker {
         this.pdfBase64 = this._bufferToBase64(arrayBuffer);
       }
 
-      this.pdfBytes = new Uint8Array(arrayBuffer);
+      this.pdfBytes = new Uint8Array(arrayBuffer.slice(0));
       this.docNameLabel.textContent = this.documentName;
       this.docNameLabel.title = this.documentName;
 
       // Garante suporte ao PDF.js
       await this._ensurePdfJsLoaded();
 
-      const loadingTask = window.pdfjsLib.getDocument({ data: this.pdfBytes });
+      // Envia uma fatia clonada ao Worker do PDF.js para não descolar (detach) o buffer original
+      const workerData = new Uint8Array(arrayBuffer.slice(0));
+      const loadingTask = window.pdfjsLib.getDocument({ data: workerData });
       this.pdfDocument = await loadingTask.promise;
       this.totalPages = this.pdfDocument.numPages;
       this.totalPagesLabel.textContent = this.totalPages;
@@ -740,6 +727,15 @@ export class PdfStampPicker {
     const ctx = this.canvas.getContext('2d');
     await page.render({ canvasContext: ctx, viewport: viewport }).promise;
 
+    // Ajusta o tamanho base do selo (320x82 pt) proporcionalmente aos pixels da tela
+    const pixelScale = viewport.width / this.pagePdfWidth;
+    this.baseSealWidth = 320 * pixelScale;
+    this.baseSealHeight = 82 * pixelScale;
+
+    const stampW = this.baseSealWidth * this.sealScale;
+    const stampH = this.baseSealHeight * this.sealScale;
+    this.stampOverlay.style.width = `${stampW}px`;
+    this.stampOverlay.style.height = `${stampH}px`;
     this.stampOverlay.style.display = 'block';
 
     // Recalcula limites se já houver posição definida
@@ -881,9 +877,7 @@ export class PdfStampPicker {
       scale: Number(this.sealScale.toFixed(2)),
       visible_seal: true,
       seal_theme_id: this.sealTheme?.id || 'icp-brasil',
-      seal_custom: this.sealTheme || null,
-      reason: 'Assinatura Digital ICP-Brasil',
-      location: 'Brasil',
+      seal_custom: typeof this.sealTheme === 'object' ? this.sealTheme : null,
       pdf: this.pdfBase64 ? `${this.pdfBase64.substring(0, 32)}...[${this.pdfBytes?.length || 0} bytes]` : null
     };
   }
@@ -904,13 +898,182 @@ export class PdfStampPicker {
       scale: Number(this.sealScale.toFixed(2)),
       visible_seal: true,
       seal_theme_id: this.sealTheme?.id || 'icp-brasil',
-      seal_custom: this.sealTheme || null,
-      reason: 'Assinatura Digital ICP-Brasil',
-      location: 'Brasil',
+      seal_custom: typeof this.sealTheme === 'object' ? this.sealTheme : null,
       pdf: this.pdfBase64
     };
   }
 
+  /**
+   * Retorna os dados geométricos essenciais do posicionamento do selo.
+   */
+  getStampConfig() {
+    return {
+      page: this.currentPageNumber,
+      x: this.calculatedPdfX,
+      y: this.calculatedPdfY,
+      scale: Number(this.sealScale.toFixed(2)),
+      position: this.selectedPositionEnum
+    };
+  }
+
+  /**
+   * Atualiza o tema visual ou os dados do titular estampados no selo em tempo real.
+   * @param {string|Object} [theme] ID do tema ('icp-brasil', 'gov-br', etc.) ou objeto completo de tema
+   * @param {Object} [signerInfo] Dados do titular: { signerName, signerDoc }
+   */
+  updateSealTheme(theme, signerInfo) {
+    if (theme) {
+      this.sealTheme = theme;
+    }
+    if (signerInfo) {
+      this.signerInfo = { ...(this.signerInfo || {}), ...signerInfo };
+    }
+    this._renderSealGraphic();
+  }
+
+  _renderSealGraphic() {
+    const theme = typeof this.sealTheme === 'object' && this.sealTheme !== null
+      ? this.sealTheme
+      : this._getPresetTheme(this.sealTheme);
+
+    const signer = this.signerInfo || {};
+    const rawName = signer.signerName || 'Nome do Titular do Certificado';
+    // Remove sufixo :CPF ou :CNPJ para exibir apenas o nome limpo do titular, idêntico ao assinador Java
+    const name = rawName.includes(':') ? rawName.split(':')[0].trim() : rawName.trim();
+    const doc = signer.signerDoc || 'CPF: ***.456.789-**';
+    const dateText = new Date().toLocaleDateString('pt-BR') + ' ' + new Date().toLocaleTimeString('pt-BR');
+
+    // Ajusta o tamanho da fonte proporcionalmente ao comprimento do nome
+    let nameFontSize = 11.5;
+    if (name.length > 36) nameFontSize = 8.8;
+    else if (name.length > 26) nameFontSize = 10.0;
+
+    let iconGraphic = '';
+    if (theme.customLogoBase64) {
+      iconGraphic = `<image xlink:href="${theme.customLogoBase64}" href="${theme.customLogoBase64}" x="12" y="14" width="34" height="54" preserveAspectRatio="xMidYMid meet" />`;
+    } else {
+      switch (theme.iconStyle || theme.id) {
+        case 'star':
+        case 'gov-br':
+          iconGraphic = `
+            <circle cx="28" cy="30" r="15" fill="${theme.primaryColor}" opacity="0.12" />
+            <circle cx="28" cy="30" r="15" fill="none" stroke="${theme.primaryColor}" stroke-width="1.5" />
+            <path d="M28 18 L31 26 L39 26 L33 31 L35 39 L28 34 L21 39 L23 31 L17 26 L25 26 Z" fill="${theme.secondaryColor || '#fbbf24'}" />
+          `;
+          break;
+        case 'crystal':
+        case 'cybercore-modern':
+          iconGraphic = `
+            <polygon points="28,14 42,22 42,38 28,46 14,38 14,22" fill="${theme.primaryColor}" opacity="0.15" />
+            <polygon points="28,14 42,22 42,38 28,46 14,38 14,22" fill="none" stroke="${theme.primaryColor}" stroke-width="1.5" />
+            <line x1="28" y1="14" x2="28" y2="46" stroke="${theme.secondaryColor || '#10b981'}" stroke-width="1.5" />
+          `;
+          break;
+        case 'notary':
+        case 'minimal-clean':
+          iconGraphic = `
+            <circle cx="28" cy="30" r="16" fill="none" stroke="${theme.primaryColor}" stroke-width="2" stroke-dasharray="3,2" />
+            <circle cx="28" cy="30" r="12" fill="${theme.primaryColor}" opacity="0.1" />
+            <path d="M22 30 L26 34 L34 26" fill="none" stroke="${theme.secondaryColor || '#64748b'}" stroke-width="2" stroke-linecap="round" />
+          `;
+          break;
+        case 'shield':
+        case 'icp-brasil':
+        default:
+          iconGraphic = `
+            <path d="M28 12 L40 17 V28 C40 38 33 46 28 49 C23 46 16 38 16 28 V17 Z" fill="${theme.primaryColor}" opacity="0.12" />
+            <path d="M28 12 L40 17 V28 C40 38 33 46 28 49 C23 46 16 38 16 28 V17 Z" fill="none" stroke="${theme.primaryColor}" stroke-width="1.8" />
+            <rect x="23" y="27" width="10" height="8" rx="2" fill="${theme.secondaryColor || theme.primaryColor}" />
+            <path d="M25 27 V23.5 C25 21.8 26.3 20.5 28 20.5 C29.7 20.5 31 21.8 31 23.5 V27" fill="none" stroke="${theme.secondaryColor || theme.primaryColor}" stroke-width="1.5" />
+          `;
+          break;
+      }
+    }
+
+    const header = theme.customHeader || (theme.id === 'cybercore-modern' ? 'CYBERCORE SIGNER • ASSINATURA ELETRÔNICA' : (theme.id === 'minimal-clean' ? 'Assinado Digitalmente' : 'DOCUMENTO ASSINADO DIGITALMENTE'));
+    const footer = theme.customFooter || (theme.id === 'minimal-clean' ? 'Conforme MP 2.200-2/2001 e ICP-Brasil' : 'ICP-Brasil • MP nº 2.200-2/2001');
+
+    const svg = `
+      <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 320 82" width="100%" height="100%" style="background:${theme.backgroundColor || '#ffffff'}; border-radius:6px;">
+        <rect x="1" y="1" width="318" height="80" rx="6" fill="${theme.backgroundColor || '#ffffff'}" stroke="${theme.borderColor || '#cbd5e1'}" stroke-width="1.5"/>
+        <rect x="1" y="1" width="6" height="80" rx="3" fill="${theme.primaryColor || '#0d47a1'}"/>
+        
+        <!-- Emblema / Brasão -->
+        <g id="seal-icon-group">
+          ${iconGraphic}
+        </g>
+
+        <!-- Tipografia do Selo -->
+        <text x="54" y="19" font-family="-apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif" font-size="8.5" font-weight="bold" fill="${theme.primaryColor || '#0d47a1'}" letter-spacing="0.3">${header}</text>
+        <text x="54" y="34" font-family="-apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif" font-size="${nameFontSize}" font-weight="bold" fill="${theme.textColor || '#0f172a'}">${name}</text>
+        <text x="54" y="47" font-family="-apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif" font-size="8" fill="#475569">${doc}</text>
+        <text x="54" y="58" font-family="-apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif" font-size="8" fill="#475569">Data: ${dateText}</text>
+        <text x="54" y="70" font-family="-apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif" font-size="7.5" fill="#64748b">${footer}</text>
+      </svg>
+    `;
+
+    if (this.stampOverlay) {
+      const container = this.stampOverlay.querySelector('.stamp-svg-container');
+      if (container) {
+        container.innerHTML = svg;
+      }
+    }
+  }
+
+  _getPresetTheme(themeId) {
+    switch (themeId) {
+      case 'gov-br':
+        return {
+          id: 'gov-br',
+          primaryColor: '#005696',
+          secondaryColor: '#ffcc00',
+          backgroundColor: '#ffffff',
+          borderColor: '#93c5fd',
+          textColor: '#0f172a',
+          iconStyle: 'star',
+          customHeader: 'DOCUMENTO ASSINADO DIGITALMENTE • GOV.BR',
+          customFooter: 'Conforme Decreto nº 10.543/2020 e ICP-Brasil'
+        };
+      case 'cybercore-modern':
+        return {
+          id: 'cybercore-modern',
+          primaryColor: '#0284c7',
+          secondaryColor: '#10b981',
+          backgroundColor: '#ffffff',
+          borderColor: '#38bdf8',
+          textColor: '#0f172a',
+          iconStyle: 'crystal',
+          customHeader: 'CYBERCORE SIGNER • ASSINATURA ELETRÔNICA',
+          customFooter: 'Validação criptográfica com fé pública'
+        };
+      case 'minimal-clean':
+        return {
+          id: 'minimal-clean',
+          primaryColor: '#334155',
+          secondaryColor: '#64748b',
+          backgroundColor: '#fafafa',
+          borderColor: '#cbd5e1',
+          textColor: '#1e293b',
+          iconStyle: 'notary',
+          customHeader: 'Assinado Digitalmente',
+          customFooter: 'Conforme MP 2.200-2/2001 e ICP-Brasil'
+        };
+      case 'icp-brasil':
+      default:
+        return {
+          id: 'icp-brasil',
+          primaryColor: '#0d47a1',
+          secondaryColor: '#0284c7',
+          backgroundColor: '#ffffff',
+          borderColor: '#93c5fd',
+          textColor: '#0f172a',
+          iconStyle: 'shield',
+          customHeader: 'ASSINADO DIGITALMENTE • ICP-BRASIL',
+          customFooter: 'ICP-Brasil • MP nº 2.200-2/2001'
+        };
+    }
+  }
+
   _bufferToBase64(buffer) {
     const bytes = new Uint8Array(buffer);
     let binary = '';
diff --git a/sdk/src/signer-sdk.js b/sdk/src/signer-sdk.js
index 415a672..9d9eeac 100644
--- a/sdk/src/signer-sdk.js
+++ b/sdk/src/signer-sdk.js
@@ -691,8 +691,71 @@ export class CyberCoreSigner {
   // Métodos Utilitários Internos
   // =========================================================================
 
+  /**
+   * Executa requisições HTTP REST ao servidor local CCSP/1.
+   *
+   * @param {string} endpoint Caminho do endpoint (ex: '/ccsp/v1/status').
+   * @param {Object} [options={}] Opções do fetch (method, body, timeoutMs, etc).
+   * @returns {Promise<Object>} Resposta JSON decodificada.
+   */
+  async _fetch(endpoint, options = {}) {
+    const url = `${this.baseUrl}${endpoint}`;
+    const timeout = options.timeoutMs || 15000;
+    const controller = typeof AbortController !== 'undefined' ? new AbortController() : null;
+    const timeoutId = controller ? setTimeout(() => controller.abort(), timeout) : null;
+
+    try {
+      const headers = {
+        'Accept': 'application/json',
+        'X-CyberCore-AppId': this.applicationId,
+        ...(options.headers || {})
+      };
+
+      if (options.body && !headers['Content-Type']) {
+        headers['Content-Type'] = 'application/json';
+      }
+
+      const fetchOptions = {
+        ...options,
+        headers
+      };
+
+      if (controller) {
+        fetchOptions.signal = controller.signal;
+      }
+
+      const res = await fetch(url, fetchOptions);
+      const data = await res.json().catch(() => ({}));
+
+      if (!res.ok) {
+        const errorCode = data.error_code || `HTTP_${res.status}`;
+        const message = data.message || `Erro retornado pelo agente (${res.status})`;
+        this._throwMappedError(errorCode, message);
+      }
+
+      return data;
+    } catch (err) {
+      if (err.name === 'AbortError') {
+        throw new CyberCoreError(`Tempo limite esgotado (${timeout}ms) na comunicação com o agente.`, 'TIMEOUT_ERROR');
+      }
+      if (err instanceof CyberCoreError) {
+        throw err;
+      }
+      throw new AgentNotRunningError(`Falha ao conectar com o CyberCore Signer em ${this.baseUrl}: ${err.message}`);
+    } finally {
+      if (timeoutId) {
+        clearTimeout(timeoutId);
+      }
+    }
+  }
+
   async _fileToBuffer(file) {
-    if (file instanceof ArrayBuffer) return file;
+    if (file instanceof ArrayBuffer) {
+      if (file.byteLength === 0) {
+        throw new Error('O buffer binário está vazio ou foi desacoplado (detached). Forneça o objeto File ou Blob original.');
+      }
+      return file;
+    }
     if (ArrayBuffer.isView(file)) {
       return file.buffer.slice(file.byteOffset, file.byteOffset + file.byteLength);
     }