diff --git a/.github/copilot-instructions.md b/.github/copilot-instructions.md
index 529a226..26c46aa 100644
--- a/.github/copilot-instructions.md
+++ b/.github/copilot-instructions.md
@@ -117,6 +117,115 @@ sshpass -p 'Master9354' ssh -o StrictHostKeyChecking=no root@213.165.93.60 "mysq
 
 ❌ NUNCA usar `ssh root@213.165.93.60` sem sshpass (vai travar esperando senha)
 
+## 🎨 Padrão Visual de Modais
+
+**TODOS os modais de formulário devem seguir este padrão elegante:**
+
+### Estrutura Base
+```jsx
+<div className="modal show d-block" style={{ backgroundColor: 'rgba(0,0,0,0.8)' }}>
+  <div className="modal-dialog modal-dialog-centered modal-lg">
+    <div className="modal-content border-0" style={{ background: '#1e293b', maxHeight: '90vh' }}>
+      
+      {/* Header sem borda */}
+      <div className="modal-header border-0 pb-0">
+        <div>
+          <h5 className="modal-title text-white mb-1">
+            <i className="bi bi-icon me-2 text-primary"></i>
+            Título
+          </h5>
+          <p className="text-slate-400 mb-0 small">Subtítulo</p>
+        </div>
+        <button className="btn-close btn-close-white" onClick={onClose}></button>
+      </div>
+
+      {/* Body com scroll */}
+      <div className="modal-body pt-3" style={{ maxHeight: '65vh', overflowY: 'auto' }}>
+        {/* Preview Card - SEMPRE no topo */}
+        <div className="mb-4 p-3 rounded-3" style={{ background: '#0f172a' }}>
+          {/* Preview visual do item sendo criado/editado */}
+        </div>
+
+        {/* Campos em cards com background #0f172a */}
+        {/* Labels com ícones coloridos */}
+        {/* Badges "Opcional" quando necessário */}
+      </div>
+
+      {/* Footer sem borda */}
+      <div className="modal-footer border-0">
+        <button className="btn btn-outline-secondary px-4">Cancelar</button>
+        <button className="btn btn-primary px-4">Salvar</button>
+      </div>
+    </div>
+  </div>
+</div>
+```
+
+### Cores do Sistema
+- **Background modal**: `#1e293b`
+- **Background campos/cards**: `#0f172a`
+- **Texto principal**: `text-white`
+- **Texto secundário**: `text-slate-400`
+- **Texto desabilitado**: `text-slate-500`
+
+### Labels com Ícones
+```jsx
+<label className="form-label text-white fw-medium mb-2">
+  <i className="bi bi-type me-2 text-primary"></i>
+  Nome *
+</label>
+```
+
+### Badge Opcional
+```jsx
+<span className="badge bg-secondary ms-2" style={{ fontSize: '0.65rem' }}>
+  {t('common.optional')}
+</span>
+```
+
+### Seleção Visual com Cards
+Para seleções (categorias, ícones), usar cards clicáveis:
+```jsx
+<div
+  onClick={() => handleSelect(item)}
+  className="p-2 rounded text-center"
+  style={{ 
+    background: isSelected ? 'rgba(59, 130, 246, 0.15)' : '#0f172a',
+    cursor: 'pointer',
+    border: isSelected ? '2px solid #3b82f6' : '2px solid transparent'
+  }}
+>
+  <i className={`bi ${icon} d-block mb-1`} style={{ color }}></i>
+  <small className="text-white">{label}</small>
+</div>
+```
+
+### Seção de Keywords/Tags
+```jsx
+<div className="p-3 rounded" style={{ background: '#0f172a' }}>
+  <div className="input-group mb-2">
+    <input className="form-control bg-dark text-white border-0" />
+    <button className="btn btn-primary px-3">
+      <i className="bi bi-plus-lg"></i>
+    </button>
+  </div>
+  <div className="d-flex flex-wrap gap-2">
+    {/* Tags com cor do item */}
+  </div>
+</div>
+```
+
+### Switch de Status
+```jsx
+<div className="form-check form-switch">
+  <input type="checkbox" className="form-check-input" role="switch" />
+  <label className="form-check-label text-white">
+    <i className={`bi ${isActive ? 'bi-check-circle text-success' : 'bi-x-circle text-secondary'} me-2`}></i>
+    {isActive ? 'Activo' : 'Inactivo'}
+  </label>
+</div>
+```
+
 ## Documentação
 
 Consulte `.DIRETRIZES_DESENVOLVIMENTO_v5` para regras completas.
diff --git a/frontend/src/i18n/locales/en.json b/frontend/src/i18n/locales/en.json
index 211a7e2..36b5ac3 100644
--- a/frontend/src/i18n/locales/en.json
+++ b/frontend/src/i18n/locales/en.json
@@ -412,8 +412,13 @@
     "budget": "Budget",
     "keywords": "Keywords",
     "addKeyword": "Add Keyword",
-    "keywordPlaceholder": "Type a keyword",
-    "keywordHelp": "Keywords help automatically assign transactions",
+    "keywordPlaceholder": "Type and press Enter...",
+    "keywordHelp": "E.g.: \"UBER\", \"iFood\" - Transactions with these words are auto-assigned",
+    "noKeywords": "No keywords. Transactions will be assigned manually.",
+    "namePlaceholder": "E.g.: Project Alpha, Marketing Dept...",
+    "descPlaceholder": "Describe the purpose of this cost center...",
+    "visualSettings": "Appearance",
+    "autoAssignLabel": "Auto-assign",
     "createSuccess": "Cost center created successfully",
     "updateSuccess": "Cost center updated successfully",
     "deleteSuccess": "Cost center deleted successfully",
diff --git a/frontend/src/i18n/locales/es.json b/frontend/src/i18n/locales/es.json
index 5cabdeb..c7ecde2 100644
--- a/frontend/src/i18n/locales/es.json
+++ b/frontend/src/i18n/locales/es.json
@@ -415,8 +415,13 @@
     "budget": "Presupuesto",
     "keywords": "Palabras Clave",
     "addKeyword": "Agregar Palabra Clave",
-    "keywordPlaceholder": "Escribe una palabra clave",
-    "keywordHelp": "Las palabras clave ayudan a asignar transacciones automáticamente",
+    "keywordPlaceholder": "Escribe y presiona Enter...",
+    "keywordHelp": "Ej: \"UBER\", \"iFood\" - Transacciones con estas palabras se asignan automáticamente",
+    "noKeywords": "Sin palabras clave. Las transacciones se asignarán manualmente.",
+    "namePlaceholder": "Ej: Proyecto Alpha, Dpto. Marketing...",
+    "descPlaceholder": "Describe el propósito de este centro de costo...",
+    "visualSettings": "Apariencia",
+    "autoAssignLabel": "Auto-asignación",
     "createSuccess": "Centro de costo creado correctamente",
     "updateSuccess": "Centro de costo actualizado correctamente",
     "deleteSuccess": "Centro de costo eliminado correctamente",
diff --git a/frontend/src/i18n/locales/pt-BR.json b/frontend/src/i18n/locales/pt-BR.json
index ec8cb66..30f4a04 100644
--- a/frontend/src/i18n/locales/pt-BR.json
+++ b/frontend/src/i18n/locales/pt-BR.json
@@ -417,8 +417,13 @@
     "budget": "Orçamento",
     "keywords": "Palavras-chave",
     "addKeyword": "Adicionar Palavra-chave",
-    "keywordPlaceholder": "Digite uma palavra-chave",
-    "keywordHelp": "Palavras-chave ajudam a atribuir transações automaticamente",
+    "keywordPlaceholder": "Digite e pressione Enter...",
+    "keywordHelp": "Ex: \"UBER\", \"iFood\" - Transações com essas palavras são atribuídas automaticamente",
+    "noKeywords": "Sem palavras-chave. Transações serão atribuídas manualmente.",
+    "namePlaceholder": "Ex: Projeto Alpha, Dpto. Marketing...",
+    "descPlaceholder": "Descreva o propósito deste centro de custo...",
+    "visualSettings": "Aparência",
+    "autoAssignLabel": "Auto-atribuição",
     "createSuccess": "Centro de custo criado com sucesso",
     "updateSuccess": "Centro de custo atualizado com sucesso",
     "deleteSuccess": "Centro de custo excluído com sucesso",
diff --git a/frontend/src/pages/CostCenters.jsx b/frontend/src/pages/CostCenters.jsx
index 8dfa8d1..034ec82 100644
--- a/frontend/src/pages/CostCenters.jsx
+++ b/frontend/src/pages/CostCenters.jsx
@@ -357,170 +357,242 @@ const CostCenters = () => {
         </div>
       )}
 
-      {/* Modal de Criar/Editar */}
+      {/* Modal de Criar/Editar - Design Elegante */}
       {showModal && (
-        <div className="modal show d-block" style={{ backgroundColor: 'rgba(0,0,0,0.7)' }}>
-          <div className="modal-dialog modal-lg modal-dialog-centered">
-            <div className="modal-content" style={{ background: '#1e293b' }}>
-              <div className="modal-header border-bottom" style={{ borderColor: '#334155 !important' }}>
-                <h5 className="modal-title text-white">
-                  <i className={`bi ${selectedItem ? 'bi-pencil' : 'bi-plus-circle'} me-2`}></i>
-                  {selectedItem ? t('costCenters.editCostCenter') : t('costCenters.newCostCenter')}
-                </h5>
+        <div className="modal show d-block" style={{ backgroundColor: 'rgba(0,0,0,0.8)' }}>
+          <div className="modal-dialog modal-dialog-centered modal-lg">
+            <div className="modal-content border-0" style={{ background: '#1e293b', maxHeight: '90vh' }}>
+              {/* Header elegante */}
+              <div className="modal-header border-0 pb-0">
+                <div>
+                  <h5 className="modal-title text-white mb-1">
+                    <i className={`bi ${selectedItem ? 'bi-pencil-square' : 'bi-plus-circle-dotted'} me-2 text-success`}></i>
+                    {selectedItem ? t('costCenters.editCostCenter') : t('costCenters.newCostCenter')}
+                  </h5>
+                  <p className="text-slate-400 mb-0 small">
+                    {t('costCenters.title')}
+                  </p>
+                </div>
                 <button type="button" className="btn-close btn-close-white" onClick={handleCloseModal}></button>
               </div>
+              
               <form onSubmit={handleSubmit}>
-                <div className="modal-body">
-                  <div className="row g-3">
-                    {/* Nome */}
+                <div className="modal-body pt-3" style={{ maxHeight: '65vh', overflowY: 'auto' }}>
+                  
+                  {/* Preview Card */}
+                  <div className="mb-4 p-3 rounded-3" style={{ background: '#0f172a' }}>
+                    <div className="d-flex align-items-center">
+                      <div 
+                        className="rounded-circle d-flex align-items-center justify-content-center me-3"
+                        style={{ 
+                          width: 50, 
+                          height: 50, 
+                          background: `${formData.color}25`,
+                          border: `2px solid ${formData.color}`,
+                        }}
+                      >
+                        <i className={`bi ${formData.icon}`} style={{ fontSize: '1.3rem', color: formData.color }}></i>
+                      </div>
+                      <div>
+                        <h6 className="text-white mb-0">{formData.name || t('costCenters.newCostCenter')}</h6>
+                        <small className="text-slate-400">
+                          {formData.code ? `${t('costCenters.code')}: ${formData.code}` : t('common.description')}
+                        </small>
+                      </div>
+                      <div className="ms-auto">
+                        {formData.is_active ? (
+                          <span className="badge bg-success bg-opacity-25 text-success">{t('common.active')}</span>
+                        ) : (
+                          <span className="badge bg-secondary bg-opacity-25 text-secondary">{t('common.inactive')}</span>
+                        )}
+                      </div>
+                    </div>
+                  </div>
+
+                  {/* Nome e Código - Linha principal */}
+                  <div className="row g-3 mb-4">
                     <div className="col-md-8">
-                      <label className="form-label text-slate-300">{t('common.name')} *</label>
+                      <label className="form-label text-white fw-medium mb-2">
+                        <i className="bi bi-type me-2 text-primary"></i>
+                        {t('common.name')} *
+                      </label>
                       <input
                         type="text"
-                        className="form-control bg-dark text-white border-secondary"
+                        className="form-control bg-dark text-white border-0"
+                        style={{ background: '#0f172a' }}
                         name="name"
                         value={formData.name}
                         onChange={handleChange}
-                        placeholder="Ex: Projeto Alpha, Departamento RH..."
+                        placeholder={t('costCenters.namePlaceholder') || 'Ej: Proyecto Alpha, Dpto. Marketing...'}
                         required
+                        autoFocus
                       />
                     </div>
-
-                    {/* Código */}
                     <div className="col-md-4">
-                      <label className="form-label text-slate-300">{t('costCenters.code')}</label>
+                      <label className="form-label text-white fw-medium mb-2">
+                        <i className="bi bi-hash me-2 text-warning"></i>
+                        {t('costCenters.code')}
+                        <span className="badge bg-secondary ms-2" style={{ fontSize: '0.65rem' }}>{t('common.optional')}</span>
+                      </label>
                       <input
                         type="text"
-                        className="form-control bg-dark text-white border-secondary"
+                        className="form-control bg-dark text-white border-0"
+                        style={{ background: '#0f172a' }}
                         name="code"
                         value={formData.code}
                         onChange={handleChange}
-                        placeholder="Ex: CC001"
+                        placeholder="CC001"
                         maxLength="20"
                       />
                     </div>
+                  </div>
 
-                    {/* Cor */}
-                    <div className="col-md-3">
-                      <label className="form-label text-slate-300">{t('common.color')}</label>
-                      <input
-                        type="color"
-                        className="form-control form-control-color bg-dark border-secondary w-100"
-                        name="color"
-                        value={formData.color}
-                        onChange={handleChange}
-                      />
-                    </div>
-
-                    {/* Ícone */}
-                    <div className="col-md-5">
-                      <label className="form-label text-slate-300">{t('common.icon')}</label>
-                      <IconSelector
-                        value={formData.icon}
-                        onChange={(icon) => setFormData(prev => ({ ...prev, icon }))}
-                        type="costCenter"
-                      />
-                    </div>
-
-                    {/* Status */}
-                    <div className="col-md-4">
-                      <label className="form-label text-slate-300">&nbsp;</label>
-                      <div className="form-check mt-2">
-                        <input
-                          type="checkbox"
-                          className="form-check-input"
-                          id="is_active"
-                          name="is_active"
-                          checked={formData.is_active}
-                          onChange={handleChange}
-                        />
-                        <label className="form-check-label text-slate-300" htmlFor="is_active">
-                          {t('common.active')}
-                        </label>
+                  {/* Visual - Cor e Ícone */}
+                  <div className="mb-4">
+                    <label className="form-label text-white fw-medium mb-2">
+                      <i className="bi bi-palette me-2 text-success"></i>
+                      {t('costCenters.visualSettings') || t('categories.visualSettings') || 'Apariencia'}
+                    </label>
+                    <div className="row g-3">
+                      <div className="col-4">
+                        <div className="p-3 rounded text-center" style={{ background: '#0f172a' }}>
+                          <label className="text-slate-400 small d-block mb-2">{t('common.color')}</label>
+                          <input
+                            type="color"
+                            className="form-control form-control-color mx-auto border-0"
+                            style={{ width: 50, height: 50, cursor: 'pointer', background: 'transparent' }}
+                            name="color"
+                            value={formData.color}
+                            onChange={handleChange}
+                          />
+                        </div>
+                      </div>
+                      <div className="col-8">
+                        <div className="p-3 rounded h-100" style={{ background: '#0f172a' }}>
+                          <label className="text-slate-400 small d-block mb-2">{t('common.icon')}</label>
+                          <IconSelector
+                            value={formData.icon}
+                            onChange={(icon) => setFormData(prev => ({ ...prev, icon }))}
+                            type="costCenter"
+                          />
+                        </div>
                       </div>
                     </div>
+                  </div>
 
-                    {/* Descrição */}
-                    <div className="col-12">
-                      <label className="form-label text-slate-300">{t('common.description')}</label>
-                      <textarea
-                        className="form-control bg-dark text-white border-secondary"
-                        name="description"
-                        value={formData.description}
-                        onChange={handleChange}
-                        rows="2"
-                        placeholder="Descreva o propósito deste centro de custo..."
-                      ></textarea>
-                    </div>
+                  {/* Descrição */}
+                  <div className="mb-4">
+                    <label className="form-label text-white fw-medium mb-2">
+                      <i className="bi bi-text-paragraph me-2 text-secondary"></i>
+                      {t('common.description')}
+                      <span className="badge bg-secondary ms-2" style={{ fontSize: '0.65rem' }}>{t('common.optional')}</span>
+                    </label>
+                    <textarea
+                      className="form-control bg-dark text-white border-0"
+                      style={{ background: '#0f172a' }}
+                      name="description"
+                      value={formData.description}
+                      onChange={handleChange}
+                      rows="2"
+                      placeholder={t('costCenters.descPlaceholder') || 'Describe el propósito de este centro de costo...'}
+                    ></textarea>
+                  </div>
 
-                    {/* Palavras-chave */}
-                    <div className="col-12">
-                      <label className="form-label text-slate-300">
-                        <i className="bi bi-key me-1"></i>
-                        {t('costCenters.keywordHelp')}
-                      </label>
+                  {/* Palavras-chave - Seção destacada */}
+                  <div className="mb-3">
+                    <label className="form-label text-white fw-medium mb-2">
+                      <i className="bi bi-key me-2 text-warning"></i>
+                      {t('costCenters.keywords')}
+                      <span className="badge bg-warning text-dark ms-2" style={{ fontSize: '0.65rem' }}>
+                        {t('costCenters.autoAssignLabel') || 'Auto-asignación'}
+                      </span>
+                    </label>
+                    <div className="p-3 rounded" style={{ background: '#0f172a' }}>
                       <div className="input-group mb-2">
                         <input
                           type="text"
-                          className="form-control bg-dark text-white border-secondary"
+                          className="form-control bg-dark text-white border-0"
+                          style={{ background: '#1e293b' }}
                           value={newKeyword}
                           onChange={(e) => setNewKeyword(e.target.value)}
                           onKeyPress={handleKeywordKeyPress}
-                          placeholder="Digite uma palavra-chave e pressione Enter..."
+                          placeholder={t('costCenters.keywordPlaceholder') || 'Escribe y presiona Enter...'}
                         />
                         <button 
                           type="button" 
-                          className="btn btn-outline-success"
+                          className="btn btn-success px-3"
                           onClick={handleAddKeyword}
                         >
-                          <i className="bi bi-plus"></i>
+                          <i className="bi bi-plus-lg"></i>
                         </button>
                       </div>
                       <div className="d-flex flex-wrap gap-2">
                         {formData.keywords.map((keyword, index) => (
                           <span 
                             key={index}
-                            className="badge d-flex align-items-center"
+                            className="badge d-flex align-items-center py-2 px-3"
                             style={{ 
                               backgroundColor: formData.color + '25',
                               color: formData.color,
+                              fontSize: '0.85rem'
                             }}
                           >
                             {keyword}
                             <button
                               type="button"
-                              className="btn-close btn-close-white ms-2"
-                              style={{ fontSize: '8px' }}
+                              className="btn-close ms-2"
+                              style={{ fontSize: '8px', filter: 'brightness(1.5)' }}
                               onClick={() => handleRemoveKeyword(keyword)}
                             ></button>
                           </span>
                         ))}
                         {formData.keywords.length === 0 && (
                           <small className="text-slate-500">
-                            {t('common.noData')}
+                            <i className="bi bi-info-circle me-1"></i>
+                            {t('costCenters.noKeywords') || 'Sin palabras clave. Las transacciones se asignarán manualmente.'}
                           </small>
                         )}
                       </div>
-                      <small className="text-slate-500 mt-2 d-block">
-                        Ex: "UBER", "iFood", "Supermercado XYZ" - Quando estas palavras aparecerem na 
-                        descrição de uma transação, este centro de custo será sugerido automaticamente.
-                      </small>
                     </div>
+                    <small className="text-slate-500 mt-2 d-block">
+                      <i className="bi bi-lightbulb me-1"></i>
+                      {t('costCenters.keywordHelp')}
+                    </small>
+                  </div>
+
+                  {/* Status */}
+                  <div className="form-check form-switch">
+                    <input
+                      type="checkbox"
+                      className="form-check-input"
+                      id="is_active"
+                      name="is_active"
+                      checked={formData.is_active}
+                      onChange={handleChange}
+                      role="switch"
+                    />
+                    <label className="form-check-label text-white" htmlFor="is_active">
+                      <i className={`bi ${formData.is_active ? 'bi-check-circle text-success' : 'bi-x-circle text-secondary'} me-2`}></i>
+                      {formData.is_active ? t('common.active') : t('common.inactive')}
+                    </label>
                   </div>
                 </div>
-                <div className="modal-footer border-top" style={{ borderColor: '#334155 !important' }}>
-                  <button type="button" className="btn btn-outline-light" onClick={handleCloseModal}>
+                
+                {/* Footer elegante */}
+                <div className="modal-footer border-0">
+                  <button type="button" className="btn btn-outline-secondary px-4" onClick={handleCloseModal}>
+                    <i className="bi bi-x-lg me-2"></i>
                     {t('common.cancel')}
                   </button>
-                  <button type="submit" className="btn btn-success" disabled={saving}>
+                  <button type="submit" className="btn btn-success px-4" disabled={saving || !formData.name.trim()}>
                     {saving ? (
                       <>
                         <span className="spinner-border spinner-border-sm me-2"></span>
-                        {t('common.loading')}
+                        {t('common.saving')}
                       </>
                     ) : (
                       <>
-                        <i className="bi bi-check-lg me-2"></i>
+                        <i className={`bi ${selectedItem ? 'bi-check-lg' : 'bi-plus-lg'} me-2`}></i>
                         {selectedItem ? t('common.save') : t('common.create')}
                       </>
                     )}