diff --git a/includes/lang/ca.php b/includes/lang/ca.php
index b05eaf4..116927d 100644
--- a/includes/lang/ca.php
+++ b/includes/lang/ca.php
@@ -795,6 +795,7 @@ return [
     'bs_rule_search_ph'  => '🔍 Cercar una paraula clau (ex: AUCHAN)...',
     'error_loading_settings' => 'Error en carregar la configuració',
     'settings'           => 'Configuració',
+    'bud_err_delete_system_cat' => 'Cannot delete a core system category.',
     
     // --- MODULE BUDGET : IMPORT CSV ---
     'bud_import_csv' => "Importar CSV",
diff --git a/includes/lang/en.php b/includes/lang/en.php
index 338572a..c34c6d6 100644
--- a/includes/lang/en.php
+++ b/includes/lang/en.php
@@ -899,6 +899,7 @@ return [
     'bud_err_network_dup'          => 'Network error during duplication.',
     'bud_sav_saving'               => 'Saving...',
     'bud_err_delete'               => 'Error during deletion.',
+    'bud_err_delete_system_cat' => 'Cannot delete a core system category.',
 
     // --- BUDGET: FORECAST ---
     'bud_prev_incomes'           => 'Income',
diff --git a/includes/lang/fr.php b/includes/lang/fr.php
index 116c170..35c3a6f 100644
--- a/includes/lang/fr.php
+++ b/includes/lang/fr.php
@@ -809,6 +809,7 @@ return [
     'bs_rule_search_ph'  => '🔍 Rechercher un mot-clé (ex: AUCHAN)...',
     'error_loading_settings' => 'Erreur lors du chargement des paramètres',
     'settings'           => 'Paramètres',
+    'bud_err_delete_system_cat' => 'Impossible de supprimer une catégorie système essentielle.',
 
     // --- BUDGET : RECAP ---
     'bud_recap_monthly_title'   => 'Récapitulatif Mensuel',
diff --git a/modules/budget/includes/api/settings.php b/modules/budget/includes/api/settings.php
index 6def90d..81b1b76 100644
--- a/modules/budget/includes/api/settings.php
+++ b/modules/budget/includes/api/settings.php
@@ -1,6 +1,7 @@
 <?php
 require __DIR__ . '/../../../../includes/auth.php';
 require __DIR__ . '/../../../../includes/db.php';
+require_once __DIR__ . '/../../../../includes/i18n.php';
 require_login();
 
 header('Content-Type: application/json');
@@ -105,6 +106,15 @@ try {
 
     if ($action === 'delete_category') {
         $id = (int)($_POST['id'] ?? 0);
+
+        $stmtCheck = $pdo->prepare("SELECT code FROM pf_budget_categories WHERE id = ?");
+        $stmtCheck->execute([$id]);
+        $catCode = $stmtCheck->fetchColumn();
+
+        if ($catCode && in_array(strtoupper($catCode), ['FIXED', 'INCOME'])) {
+            throw new Exception(tr('bud_err_delete_system_cat'));
+        }
+
         $stmt = $pdo->prepare("DELETE FROM pf_budget_categories WHERE id = ?");
         $stmt->execute([$id]);
         echo json_encode(['success' => true]);
@@ -188,7 +198,7 @@ try {
 
     throw new Exception("Action API inconnue.");
 
-} catch (Exception $e) {
+} catch (\Throwable $e) {
     http_response_code(400);
     echo json_encode(['success' => false, 'error' => $e->getMessage()]);
 }
diff --git a/modules/budget/views/settings_modal.php b/modules/budget/views/settings_modal.php
index 61c6a6a..7abbb0c 100644
--- a/modules/budget/views/settings_modal.php
+++ b/modules/budget/views/settings_modal.php
@@ -462,9 +462,10 @@ function renderSalaries(salaries, year) {
 }
 
 // --- CRUD ACTIONS ---
-async function deleteAccount(id) { if (!await pachaConfirm(tr('btn_delete'), tr('bs_confirm_delete'))) return; try { const fd = new FormData(); fd.append('action', 'delete_account'); fd.append('id', id); await pachaFetch('/modules/budget/includes/api/settings.php', { method: 'POST', body: fd }); await loadBudgetSettingsData(); } catch (err) { alert("Erreur : " + err.message); } }
+async function deleteAccount(id) { if (!await pachaConfirm(tr('btn_delete'), tr('bs_confirm_delete'))) return; try { const fd = new FormData(); fd.append('action', 'delete_account'); fd.append('id', id); await pachaFetch('/modules/budget/includes/api/settings.php', { method: 'POST', body: fd }); await loadBudgetSettingsData(); } catch (err) { if (typeof showToast === 'function') showToast(err.message, 'error'); else alert("Erreur : " + err.message); } }
+
 const formAddAccount = document.getElementById('form-add-account');
-if (formAddAccount) formAddAccount.addEventListener('submit', async (e) => { e.preventDefault(); const btn = formAddAccount.querySelector('button'); const oldText = btn.innerText; btn.innerText = '⏳'; btn.disabled = true; try { const fd = new FormData(formAddAccount); fd.append('action', 'add_account'); await pachaFetch('/modules/budget/includes/api/settings.php', { method: 'POST', body: fd }); formAddAccount.reset(); await loadBudgetSettingsData(); } catch (err) { alert("Erreur : " + err.message); } finally { btn.innerText = oldText; btn.disabled = false; } });
+if (formAddAccount) formAddAccount.addEventListener('submit', async (e) => { e.preventDefault(); const btn = formAddAccount.querySelector('button'); const oldText = btn.innerText; btn.innerText = '⏳'; btn.disabled = true; try { const fd = new FormData(formAddAccount); fd.append('action', 'add_account'); await pachaFetch('/modules/budget/includes/api/settings.php', { method: 'POST', body: fd }); formAddAccount.reset(); await loadBudgetSettingsData(); if (typeof showToast === 'function') showToast("Compte ajouté", 'success'); } catch (err) { if (typeof showToast === 'function') showToast(err.message, 'error'); else alert("Erreur : " + err.message); } finally { btn.innerText = oldText; btn.disabled = false; } });
 
 async function deleteBudgetCategory(id) { 
     if (!await pachaConfirm(tr('btn_delete'), tr('bs_confirm_delete_cat'))) return; 
@@ -472,17 +473,51 @@ async function deleteBudgetCategory(id) {
         const fd = new FormData(); 
         fd.append('action', 'delete_category'); 
         fd.append('id', id); 
-        await pachaFetch('/modules/budget/includes/api/settings.php', { method: 'POST', body: fd }); 
+        const res = await pachaFetch('/modules/budget/includes/api/settings.php', { method: 'POST', body: fd }); 
+        
+        if (!res.success) throw new Error(res.error || tr('error_occured'));
+        
         await loadBudgetSettingsData(); 
     } catch (err) { 
-        alert("Erreur : " + err.message); 
+        if (typeof showToast === 'function') {
+            showToast(err.message, 'error');
+        } else {
+            alert("Erreur : " + err.message); 
+        }
     } 
 }
 
+const formAddCategory = document.getElementById('form-add-category');
+if (formAddCategory) {
+    formAddCategory.addEventListener('submit', async (e) => {
+        e.preventDefault();
+        const btn = formAddCategory.querySelector('button');
+        const oldText = btn.innerText;
+        btn.innerText = '⏳';
+        btn.disabled = true;
+        try {
+            const fd = new FormData(formAddCategory);
+            fd.append('action', 'add_category');
+            const res = await pachaFetch('/modules/budget/includes/api/settings.php', { method: 'POST', body: fd });
+            if (!res.success) throw new Error(res.error || "Erreur lors de l'ajout");
+            formAddCategory.reset();
+            await loadBudgetSettingsData();
+            if (typeof showToast === 'function') showToast("Catégorie ajoutée", "success");
+        } catch (err) {
+            if (typeof showToast === 'function') showToast(err.message, 'error'); else alert("Erreur : " + err.message);
+        } finally {
+            btn.innerText = oldText;
+            btn.disabled = false;
+        }
+    });
+}
+
 function populateRuleCategories(categories) { const select = document.getElementById('select-rule-category'); if (!select) return; select.innerHTML = ''; if (!categories) return; categories.forEach(cat => { const opt = document.createElement('option'); opt.value = cat.code; opt.textContent = `${cat.icon || ''} ${cat.label}`; select.appendChild(opt); }); }
-async function deleteRule(id) { if (!await pachaConfirm(tr('btn_delete'), tr('bs_confirm_delete_rule'))) return; try { const fd = new FormData(); fd.append('action', 'delete_rule'); fd.append('id', id); await pachaFetch('/modules/budget/includes/api/settings.php', { method: 'POST', body: fd }); await loadBudgetSettingsData(); } catch (err) { alert("Erreur : " + err.message); } }
+
+async function deleteRule(id) { if (!await pachaConfirm(tr('btn_delete'), tr('bs_confirm_delete_rule'))) return; try { const fd = new FormData(); fd.append('action', 'delete_rule'); fd.append('id', id); await pachaFetch('/modules/budget/includes/api/settings.php', { method: 'POST', body: fd }); await loadBudgetSettingsData(); } catch (err) { if (typeof showToast === 'function') showToast(err.message, 'error'); else alert("Erreur : " + err.message); } }
+
 const formAddRule = document.getElementById('form-add-rule');
-if (formAddRule) formAddRule.addEventListener('submit', async (e) => { e.preventDefault(); const btn = formAddRule.querySelector('button'); const oldText = btn.innerText; btn.innerText = '⏳'; btn.disabled = true; try { const fd = new FormData(formAddRule); fd.append('action', 'add_rule'); await pachaFetch('/modules/budget/includes/api/settings.php', { method: 'POST', body: fd }); formAddRule.reset(); await loadBudgetSettingsData(); } catch (err) { alert("Erreur : " + err.message); } finally { btn.innerText = oldText; btn.disabled = false; } });
+if (formAddRule) formAddRule.addEventListener('submit', async (e) => { e.preventDefault(); const btn = formAddRule.querySelector('button'); const oldText = btn.innerText; btn.innerText = '⏳'; btn.disabled = true; try { const fd = new FormData(formAddRule); fd.append('action', 'add_rule'); await pachaFetch('/modules/budget/includes/api/settings.php', { method: 'POST', body: fd }); formAddRule.reset(); await loadBudgetSettingsData(); if (typeof showToast === 'function') showToast("Règle ajoutée", 'success'); } catch (err) { if (typeof showToast === 'function') showToast(err.message, 'error'); else alert("Erreur : " + err.message); } finally { btn.innerText = oldText; btn.disabled = false; } });
 
 function inlineEditSalary(btnEl) {
     const id = btnEl.dataset.id; const person = btnEl.dataset.person; const salary = btnEl.dataset.salary; const mensualite = btnEl.dataset.mensualite; const currency = '<?= CURRENCY ?>';
@@ -495,14 +530,16 @@ function inlineEditSalary(btnEl) {
             <button type="button" class="btn btn-ghost" onclick="loadBudgetSettingsData()">❌</button>
         </form>`;
 }
-async function submitInlineSalary(event, id) { event.preventDefault(); const form = event.target; const btn = form.querySelector('button'); btn.innerText = '⏳'; btn.disabled = true; try { const fd = new FormData(form); fd.append('action', 'save_salary'); fd.append('id', id); await pachaFetch('/modules/budget/includes/api/settings.php', { method: 'POST', body: fd }); await loadBudgetSettingsData(); } catch (err) { alert("Erreur : " + err.message); btn.innerText = '💾'; btn.disabled = false; } }
 
-async function updateBudgetCurrency(selectEl) { try { const fd = new FormData(); fd.append('action', 'save_currency'); fd.append('currency', selectEl.value); await pachaFetch('/modules/budget/includes/api/settings.php', { method: 'POST', body: fd }); if (typeof showToast === 'function') { showToast(`${tr('bs_currency_updated')} ✅`); } await loadBudgetSettingsData(); } catch (err) { alert("Erreur : " + err.message); } }   
+async function submitInlineSalary(event, id) { event.preventDefault(); const form = event.target; const btn = form.querySelector('button'); btn.innerText = '⏳'; btn.disabled = true; try { const fd = new FormData(form); fd.append('action', 'save_salary'); fd.append('id', id); await pachaFetch('/modules/budget/includes/api/settings.php', { method: 'POST', body: fd }); await loadBudgetSettingsData(); if (typeof showToast === 'function') showToast("Salaire mis à jour", 'success'); } catch (err) { if (typeof showToast === 'function') showToast(err.message, 'error'); else alert("Erreur : " + err.message); btn.innerText = '💾'; btn.disabled = false; } }
+
+async function updateBudgetCurrency(selectEl) { try { const fd = new FormData(); fd.append('action', 'save_currency'); fd.append('currency', selectEl.value); await pachaFetch('/modules/budget/includes/api/settings.php', { method: 'POST', body: fd }); if (typeof showToast === 'function') { showToast(`${tr('bs_currency_updated')} ✅`, 'success'); } await loadBudgetSettingsData(); } catch (err) { if (typeof showToast === 'function') showToast(err.message, 'error'); else alert("Erreur : " + err.message); } }   
 
 // CSV
 function toggleCsvAmountCols(type) { if (type === 'split') { document.getElementById('wrapper_col_credit').style.display = 'block'; document.getElementById('lbl_col_debit').innerText = tr('bs_csv_col_debit'); } else { document.getElementById('wrapper_col_credit').style.display = 'none'; document.getElementById('lbl_col_debit').innerText = tr('bs_csv_col_amount'); } }
 function renderCsvMapping(mapping) { if (!mapping) return; document.getElementById('csv_delimiter').value = mapping.delimiter || ';'; document.getElementById('csv_date_format').value = mapping.date_format || 'd/m/Y'; document.getElementById('csv_col_date').value = mapping.col_date ?? 0; document.getElementById('csv_col_label').value = mapping.col_label ?? 1; document.getElementById('csv_col_ref').value = mapping.col_ref ?? 3; const amountType = mapping.amount_type || 'split'; document.getElementById('csv_amount_type').value = amountType; document.getElementById('csv_col_debit').value = mapping.col_debit ?? 8; document.getElementById('csv_col_credit').value = mapping.col_credit ?? 9; toggleCsvAmountCols(amountType); }
-async function saveCsvMapping(e) { e.preventDefault(); const form = e.target; const btn = form.querySelector('button'); const oldText = btn.innerText; btn.innerText = '⏳...'; btn.disabled = true; try { const fd = new FormData(form); fd.append('action', 'save_csv_mapping'); await pachaFetch('/modules/budget/includes/api/settings.php', { method: 'POST', body: fd }); if (typeof showToast === 'function') showToast(tr('bs_csv_saved')); else alert(tr('bs_csv_saved')); } catch (err) { alert(tr('error_occured') + " : " + err.message); } finally { btn.innerText = oldText; btn.disabled = false; } }
+
+async function saveCsvMapping(e) { e.preventDefault(); const form = e.target; const btn = form.querySelector('button'); const oldText = btn.innerText; btn.innerText = '⏳...'; btn.disabled = true; try { const fd = new FormData(form); fd.append('action', 'save_csv_mapping'); await pachaFetch('/modules/budget/includes/api/settings.php', { method: 'POST', body: fd }); if (typeof showToast === 'function') showToast(tr('bs_csv_saved'), 'success'); else alert(tr('bs_csv_saved')); } catch (err) { if (typeof showToast === 'function') showToast(tr('error_occured') + " : " + err.message, 'error'); else alert(tr('error_occured') + " : " + err.message); } finally { btn.innerText = oldText; btn.disabled = false; } }
 
 const dropZone = document.getElementById('csv-drop-zone'); const fileInput = document.getElementById('csv_file_input');
 if (dropZone && fileInput) {
@@ -512,9 +549,13 @@ if (dropZone && fileInput) {
     dropZone.addEventListener('drop', (e) => { e.preventDefault(); dropZone.style.backgroundColor = ''; dropZone.style.borderColor = 'var(--border-light, #ccc)'; if (e.dataTransfer.files.length) { fileInput.files = e.dataTransfer.files; handleCsvUpload(e.dataTransfer.files[0]); } });
     fileInput.addEventListener('change', function() { if (this.files.length) { handleCsvUpload(this.files[0]); } });
 }
+
 function handleCsvUpload(file) {
-    if (!file.name.endsWith('.csv')) { alert(tr('bs_csv_err_type')); return; }
-    if (typeof showToast === 'function') { showToast(`${tr('bs_csv_file_ok')} : ${file.name}`); }
+    if (!file.name.endsWith('.csv')) { 
+        if (typeof showToast === 'function') showToast(tr('bs_csv_err_type'), 'error'); else alert(tr('bs_csv_err_type')); 
+        return; 
+    }
+    if (typeof showToast === 'function') { showToast(`${tr('bs_csv_file_ok')} : ${file.name}`, 'success'); }
     const reader = new FileReader();
     reader.onload = function(e) {
         const text = e.target.result; const delimiter = document.getElementById('csv_delimiter').value || ';';
@@ -528,18 +569,4 @@ function handleCsvUpload(file) {
     };
     reader.readAsText(file, 'ISO-8859-1');
 }
-function renderCsvTablePreview(headers, sampleRows) {
-    const container = document.getElementById('csv-preview-container');
-    let html = `<h5 class="bs-section-subtitle">👁️ ${tr('bs_csv_preview_title')}</h5>`;
-    html += `<div class="bs-csv-table-wrapper"><table class="bs-csv-table"><thead class="bs-csv-thead"><tr>`;
-    headers.forEach((header, index) => {
-        const cleanHeader = header || `(${tr('bs_csv_empty_col')})`;
-        html += `<th class="bs-csv-th"><div class="bs-csv-th-index">N° ${index}</div><div>${cleanHeader}</div></th>`;
-    });
-    html += `</tr></thead><tbody>`;
-    if (sampleRows.length === 0) { html += `<tr><td colspan="${headers.length}" class="bs-csv-td-empty">${tr('bs_csv_no_data')}</td></tr>`; } 
-    else { sampleRows.forEach(row => { html += `<tr class="bs-csv-tr">`; for (let i = 0; i < headers.length; i++) { const cellData = row[i] !== undefined ? row[i] : ''; const displayData = cellData.length > 40 ? cellData.substring(0, 40) + '...' : cellData; html += `<td class="bs-csv-td">${displayData}</td>`; } html += `</tr>`; }); }
-    html += `</tbody></table></div>`;
-    container.innerHTML = html; container.style.display = 'block';
-}
 </script>
\ No newline at end of file