diff --git a/declarationtva_line_details.php b/declarationtva_line_details.php
deleted file mode 100644
index 96118c2..0000000
--- a/declarationtva_line_details.php
+++ /dev/null
@@ -1,183 +0,0 @@
-<?php
-/**
- * DeclarationTVA Line Details Page
- * Shows detailed breakdown of accounts for a specific CA-3 line
- */
-
-// Load Dolibarr environment
-if (file_exists('../main.inc.php')) {
-    $res = @include '../main.inc.php';
-} elseif (file_exists('../../main.inc.php')) {
-    $res = @include '../../main.inc.php';
-} elseif (file_exists('../../../main.inc.php')) {
-    $res = @include '../../../main.inc.php';
-} else {
-    die("Include of main fails");
-}
-
-// Load module classes
-require_once DOL_DOCUMENT_ROOT . '/custom/declarationtva/core/class/declarationtva.class.php';
-require_once DOL_DOCUMENT_ROOT . '/custom/declarationtva/core/class/declarationtva_config.class.php';
-
-// Access control
-if (!$user->hasRight("declarationtva", "declarationtva", "read")) {
-    accessforbidden();
-}
-
-// Get parameters
-$declaration_id = GETPOST('declaration_id', 'int');
-$ca3_line = GETPOST('ca3_line', 'alpha');
-
-// Validate parameters
-if (empty($declaration_id) || empty($ca3_line)) {
-    setEventMessages($langs->trans("ErrorMissingParameters"), null, 'errors');
-    header("Location: declarationtvaindex.php");
-    exit;
-}
-
-// Initialize objects
-$declarationtva = new DeclarationTVA($db);
-$config = new DeclarationTVA_Config($db);
-
-// Get declaration info
-if (!$declarationtva->fetch($declaration_id)) {
-    setEventMessages($langs->trans("DeclarationNotFound"), null, 'errors');
-    header("Location: declarationtvaindex.php");
-    exit;
-}
-
-// Get detailed breakdown
-$line_details = $declarationtva->getCA3LineDetails($declaration_id, $ca3_line);
-
-if (empty($line_details)) {
-    setEventMessages($langs->trans("NoDataFoundForLine"), null, 'errors');
-    header("Location: declarationtva_view.php?id=" . $declaration_id);
-    exit;
-}
-
-// Get CA-3 line definition
-$ca3_definitions = $config->getCA3LineDefinitions();
-$line_definition = isset($ca3_definitions[$ca3_line]) ? $ca3_definitions[$ca3_line] : null;
-
-// Page title
-$title = $langs->trans("CA3LineDetails") . " - " . $ca3_line;
-if ($line_definition) {
-    $title .= " - " . $line_definition['label'];
-}
-
-// Load page header
-llxHeader('', $title);
-
-// Page header
-print load_fiche_titre($title, '', 'fa-list-alt');
-
-// Breadcrumb
-print '<div class="tabsAction">';
-print '<a href="declarationtvaindex.php" class="butAction">' . $langs->trans("BackToList") . '</a>';
-print '<a href="declarationtva_view.php?id=' . $declaration_id . '" class="butAction">' . $langs->trans("BackToDeclaration") . '</a>';
-print '</div>';
-
-// Declaration info
-print '<div class="fiche">';
-print '<div class="fichehalfleft">';
-print '<table class="noborder centpercent">';
-print '<tr class="liste_titre">';
-print '<th colspan="2">' . $langs->trans("DeclarationInfo") . '</th>';
-print '</tr>';
-print '<tr>';
-print '<td>' . $langs->trans("DeclarationNumber") . '</td>';
-print '<td>' . $declarationtva->declaration_number . '</td>';
-print '</tr>';
-print '<tr>';
-print '<td>' . $langs->trans("Period") . '</td>';
-print '<td>' . dol_print_date($declarationtva->start_date, 'day') . ' - ' . dol_print_date($declarationtva->end_date, 'day') . '</td>';
-print '</tr>';
-print '<tr>';
-print '<td>' . $langs->trans("CA3Line") . '</td>';
-print '<td><strong>' . $ca3_line . '</strong></td>';
-print '</tr>';
-if ($line_definition) {
-    print '<tr>';
-    print '<td>' . $langs->trans("Description") . '</td>';
-    print '<td>' . $line_definition['label'] . '</td>';
-    print '</tr>';
-}
-print '</table>';
-print '</div>';
-
-print '<div class="fichehalfright">';
-print '<table class="noborder centpercent">';
-print '<tr class="liste_titre">';
-print '<th colspan="2">' . $langs->trans("LineSummary") . '</th>';
-print '</tr>';
-print '<tr>';
-print '<td>' . $langs->trans("AccountCount") . '</td>';
-print '<td><strong>' . $line_details['account_count'] . '</strong></td>';
-print '</tr>';
-if ($line_details['calculated_line']) {
-    print '<tr>';
-    print '<td>' . $langs->trans("CalculatedTotal") . '</td>';
-    print '<td><strong>' . price($line_details['calculated_line']->total_amount) . '</strong></td>';
-    print '</tr>';
-}
-print '</table>';
-print '</div>';
-print '</div>';
-
-// Account details table
-print '<div class="fiche">';
-print '<table class="noborder centpercent">';
-print '<tr class="liste_titre">';
-print '<th>' . $langs->trans("AccountCode") . '</th>';
-print '<th>' . $langs->trans("AccountLabel") . '</th>';
-print '<th class="right">' . $langs->trans("BaseAmount") . '</th>';
-print '<th class="right">' . $langs->trans("VATAmount") . '</th>';
-print '<th class="right">' . $langs->trans("TotalAmount") . '</th>';
-print '<th>' . $langs->trans("MappingType") . '</th>';
-print '</tr>';
-
-$total_base = 0;
-$total_vat = 0;
-$total_amount = 0;
-
-foreach ($line_details['account_details'] as $account) {
-    $total_base += $account['base_amount'];
-    $total_vat += $account['vat_amount'];
-    $total_amount += $account['total_amount'];
-    
-    print '<tr class="oddeven">';
-    print '<td><strong>' . $account['account_code'] . '</strong></td>';
-    print '<td>' . $account['account_label'] . '</td>';
-    print '<td class="right">' . price($account['base_amount']) . '</td>';
-    print '<td class="right">' . price($account['vat_amount']) . '</td>';
-    print '<td class="right">' . price($account['total_amount']) . '</td>';
-    print '<td>' . $account['mapping_type'] . '</td>';
-    print '</tr>';
-}
-
-// Totals row
-print '<tr class="liste_titre">';
-print '<td colspan="2"><strong>' . $langs->trans("Total") . '</strong></td>';
-print '<td class="right"><strong>' . price($total_base) . '</strong></td>';
-print '<td class="right"><strong>' . price($total_vat) . '</strong></td>';
-print '<td class="right"><strong>' . price($total_amount) . '</strong></td>';
-print '<td></td>';
-print '</tr>';
-
-print '</table>';
-print '</div>';
-
-// Additional info if calculated line exists
-if ($line_details['calculated_line']) {
-    print '<div class="info">';
-    print '<strong>' . $langs->trans("Note") . ':</strong> ';
-    print $langs->trans("CalculatedLineNote");
-    if (!empty($line_details['calculated_line']->line_label)) {
-        print '<br><em>' . $line_details['calculated_line']->line_label . '</em>';
-    }
-    print '</div>';
-}
-
-// Close page
-llxFooter();
-?>
diff --git a/declarationtva_line_details_ajax.php b/declarationtva_line_details_ajax.php
new file mode 100644
index 0000000..950369a
--- /dev/null
+++ b/declarationtva_line_details_ajax.php
@@ -0,0 +1,119 @@
+<?php
+/**
+ * AJAX endpoint for loading CA-3 line details
+ * Returns HTML content for inline dropdown display
+ */
+
+// Load Dolibarr environment
+if (file_exists('../main.inc.php')) {
+    $res = @include '../main.inc.php';
+} elseif (file_exists('../../main.inc.php')) {
+    $res = @include '../../main.inc.php';
+} elseif (file_exists('../../../main.inc.php')) {
+    $res = @include '../../../main.inc.php';
+} else {
+    die("Include of main fails");
+}
+
+// Load module classes
+require_once DOL_DOCUMENT_ROOT . '/custom/declarationtva/core/class/declarationtva.class.php';
+require_once DOL_DOCUMENT_ROOT . '/custom/declarationtva/core/class/declarationtva_config.class.php';
+
+// Access control
+if (!$user->hasRight("declarationtva", "declarationtva", "read")) {
+    http_response_code(403);
+    echo "Access denied";
+    exit;
+}
+
+// Get parameters
+$declaration_id = GETPOST('declaration_id', 'int');
+$ca3_line = GETPOST('ca3_line', 'alpha');
+
+// Validate parameters
+if (empty($declaration_id) || empty($ca3_line)) {
+    echo '<div class="error">' . $langs->trans("ErrorMissingParameters") . '</div>';
+    exit;
+}
+
+// Initialize objects
+$declarationtva = new DeclarationTVA($db);
+$config = new DeclarationTVA_Config($db);
+
+// Get declaration info
+if (!$declarationtva->fetch($declaration_id)) {
+    echo '<div class="error">' . $langs->trans("DeclarationNotFound") . '</div>';
+    exit;
+}
+
+// Get detailed breakdown
+$line_details = $declarationtva->getCA3LineDetails($declaration_id, $ca3_line);
+
+if (empty($line_details)) {
+    echo '<div class="info">' . $langs->trans("NoDataFoundForLine") . '</div>';
+    exit;
+}
+
+// Get CA-3 line definition
+$ca3_definitions = $config->getCA3LineDefinitions();
+$line_definition = isset($ca3_definitions[$ca3_line]) ? $ca3_definitions[$ca3_line] : null;
+
+// Display account details table
+echo '<table class="noborder centpercent">';
+echo '<tr class="liste_titre">';
+echo '<th>' . $langs->trans("AccountCode") . '</th>';
+echo '<th>' . $langs->trans("AccountLabel") . '</th>';
+echo '<th class="right">' . $langs->trans("BaseAmount") . '</th>';
+echo '<th class="right">' . $langs->trans("VATAmount") . '</th>';
+echo '<th class="right">' . $langs->trans("TotalAmount") . '</th>';
+echo '<th>' . $langs->trans("MappingType") . '</th>';
+echo '</tr>';
+
+$total_base = 0;
+$total_vat = 0;
+$total_amount = 0;
+
+foreach ($line_details['account_details'] as $account) {
+    $total_base += $account['base_amount'];
+    $total_vat += $account['vat_amount'];
+    $total_amount += $account['total_amount'];
+    
+    echo '<tr class="oddeven">';
+    echo '<td><strong>' . $account['account_code'] . '</strong></td>';
+    echo '<td>' . $account['account_label'] . '</td>';
+    echo '<td class="right">' . price($account['base_amount']) . '</td>';
+    echo '<td class="right">' . price($account['vat_amount']) . '</td>';
+    echo '<td class="right">' . price($account['total_amount']) . '</td>';
+    echo '<td>' . $account['mapping_type'] . '</td>';
+    echo '</tr>';
+}
+
+// Totals row
+echo '<tr class="liste_titre">';
+echo '<td colspan="2"><strong>' . $langs->trans("Total") . '</strong></td>';
+echo '<td class="right"><strong>' . price($total_base) . '</strong></td>';
+echo '<td class="right"><strong>' . price($total_vat) . '</strong></td>';
+echo '<td class="right"><strong>' . price($total_amount) . '</strong></td>';
+echo '<td></td>';
+echo '</tr>';
+
+echo '</table>';
+
+// Additional info if calculated line exists
+if ($line_details['calculated_line']) {
+    echo '<div class="info" style="margin-top: 10px;">';
+    echo '<strong>' . $langs->trans("Note") . ':</strong> ';
+    echo $langs->trans("CalculatedLineNote");
+    if (!empty($line_details['calculated_line']->line_label)) {
+        echo '<br><em>' . $line_details['calculated_line']->line_label . '</em>';
+    }
+    echo '</div>';
+}
+
+// Summary info
+echo '<div class="info" style="margin-top: 10px;">';
+echo '<strong>' . $langs->trans("Summary") . ':</strong> ';
+echo $langs->trans("AccountCount") . ': ' . $line_details['account_count'] . ' | ';
+echo $langs->trans("Period") . ': ' . dol_print_date($line_details['start_date'], 'day') . ' - ' . dol_print_date($line_details['end_date'], 'day');
+echo '</div>';
+?>
diff --git a/declarationtva_view.php b/declarationtva_view.php
index b930447..c5c16df 100644
--- a/declarationtva_view.php
+++ b/declarationtva_view.php
@@ -173,10 +173,22 @@ foreach ($section_a_lines as $line) {
     $data = isset($ca3_data[$line]) ? $ca3_data[$line] : array('line_label' => '', 'vat_amount' => 0);
     $description = isset($ca3_definitions[$line]) ? $ca3_definitions[$line]['label'] : $data['line_label'];
     print '<tr>';
-    print '<td><a href="declarationtva_line_details.php?declaration_id=' . $declarationtva->rowid . '&ca3_line=' . $line . '" class="butAction">' . $line . '</a></td>';
+    print '<td><a href="#" onclick="toggleDetails(\'' . $line . '\'); return false;" class="butAction">' . $line . '</a></td>';
     print '<td colspan="2">' . $description . '</td>';
     print '<td class="right">' . formatAmountWithOriginal($data['vat_amount'], $data['line_label']) . '</td>';
     print '</tr>';
+    
+    // Add dropdown row for account details
+    print '<tr id="details_' . $line . '" style="display: none;">';
+    print '<td colspan="4">';
+    print '<div class="account-details">';
+    print '<div class="account-details-header">' . $langs->trans("AccountBreakdown") . ' - ' . $line . '</div>';
+    print '<div class="account-details-content" id="content_' . $line . '">';
+    print '<div class="loading">' . $langs->trans("Loading") . '...</div>';
+    print '</div>';
+    print '</div>';
+    print '</td>';
+    print '</tr>';
 }
 
 // Section B: TVA due
@@ -201,11 +213,23 @@ foreach ($base_vat_lines as $line) {
     $data = isset($ca3_data[$line]) ? $ca3_data[$line] : array('line_label' => '', 'base_amount' => 0, 'vat_amount' => 0);
     $description = isset($ca3_definitions[$line]) ? $ca3_definitions[$line]['label'] : $data['line_label'];
     print '<tr>';
-    print '<td><a href="declarationtva_line_details.php?declaration_id=' . $declarationtva->rowid . '&ca3_line=' . $line . '" class="butAction">' . $line . '</a></td>';
+    print '<td><a href="#" onclick="toggleDetails(\'' . $line . '\'); return false;" class="butAction">' . $line . '</a></td>';
     print '<td>' . $description . '</td>';
     print '<td class="right">' . formatAmountWithOriginal($data['base_amount'], $data['line_label'], 'base') . '</td>';
     print '<td class="right">' . formatAmountWithOriginal($data['vat_amount'], $data['line_label']) . '</td>';
     print '</tr>';
+    
+    // Add dropdown row for account details
+    print '<tr id="details_' . $line . '" style="display: none;">';
+    print '<td colspan="4">';
+    print '<div class="account-details">';
+    print '<div class="account-details-header">' . $langs->trans("AccountBreakdown") . ' - ' . $line . '</div>';
+    print '<div class="account-details-content" id="content_' . $line . '">';
+    print '<div class="loading">' . $langs->trans("Loading") . '...</div>';
+    print '</div>';
+    print '</div>';
+    print '</td>';
+    print '</tr>';
 }
 
 // Line 16: Subtotal (calculated automatically)
@@ -226,11 +250,23 @@ print '</tr>';
 $data = isset($ca3_data['17']) ? $ca3_data['17'] : array('line_label' => '', 'vat_amount' => 0);
 $description = isset($ca3_definitions['17']) ? $ca3_definitions['17']['label'] : $data['line_label'];
 print '<tr>';
-print '<td><a href="declarationtva_line_details.php?declaration_id=' . $declarationtva->rowid . '&ca3_line=17" class="butAction">17</a></td>';
+print '<td><a href="#" onclick="toggleDetails(\'17\'); return false;" class="butAction">17</a></td>';
 print '<td colspan="2">' . $description . '</td>';
 print '<td class="right">' . formatAmountWithOriginal($data['vat_amount'], $data['line_label']) . '</td>';
 print '</tr>';
 
+// Add dropdown row for account details
+print '<tr id="details_17" style="display: none;">';
+print '<td colspan="4">';
+print '<div class="account-details">';
+print '<div class="account-details-header">' . $langs->trans("AccountBreakdown") . ' - 17</div>';
+print '<div class="account-details-content" id="content_17">';
+print '<div class="loading">' . $langs->trans("Loading") . '...</div>';
+print '</div>';
+print '</div>';
+print '</td>';
+print '</tr>';
+
 // Section C: TVA déductible
 print '<tr class="liste_titre">';
 print '<td colspan="4"><strong>C. ' . $langs->trans("CA3SectionC") . '</strong></td>';
@@ -247,10 +283,22 @@ foreach ($section_c_lines as $line) {
     $data = isset($ca3_data[$line]) ? $ca3_data[$line] : array('line_label' => '', 'vat_amount' => 0);
     $description = isset($ca3_definitions[$line]) ? $ca3_definitions[$line]['label'] : $data['line_label'];
     print '<tr>';
-    print '<td><a href="declarationtva_line_details.php?declaration_id=' . $declarationtva->rowid . '&ca3_line=' . $line . '" class="butAction">' . $line . '</a></td>';
+    print '<td><a href="#" onclick="toggleDetails(\'' . $line . '\'); return false;" class="butAction">' . $line . '</a></td>';
     print '<td colspan="2">' . $description . '</td>';
     print '<td class="right">' . formatAmountWithOriginal($data['vat_amount'], $data['line_label']) . '</td>';
     print '</tr>';
+    
+    // Add dropdown row for account details
+    print '<tr id="details_' . $line . '" style="display: none;">';
+    print '<td colspan="4">';
+    print '<div class="account-details">';
+    print '<div class="account-details-header">' . $langs->trans("AccountBreakdown") . ' - ' . $line . '</div>';
+    print '<div class="account-details-content" id="content_' . $line . '">';
+    print '<div class="loading">' . $langs->trans("Loading") . '...</div>';
+    print '</div>';
+    print '</div>';
+    print '</td>';
+    print '</tr>';
 }
 
 // Line 23: Subtotal (calculated automatically)
@@ -284,10 +332,22 @@ foreach ($section_d_lines as $line) {
     }
     
     print '<tr>';
-    print '<td><a href="declarationtva_line_details.php?declaration_id=' . $declarationtva->rowid . '&ca3_line=' . $line . '" class="butAction">' . $line . '</a></td>';
+    print '<td><a href="#" onclick="toggleDetails(\'' . $line . '\'); return false;" class="butAction">' . $line . '</a></td>';
     print '<td colspan="2">' . $description . '</td>';
     print '<td class="right">' . formatAmount($data['vat_amount']) . '</td>';
     print '</tr>';
+    
+    // Add dropdown row for account details
+    print '<tr id="details_' . $line . '" style="display: none;">';
+    print '<td colspan="4">';
+    print '<div class="account-details">';
+    print '<div class="account-details-header">' . $langs->trans("AccountBreakdown") . ' - ' . $line . '</div>';
+    print '<div class="account-details-content" id="content_' . $line . '">';
+    print '<div class="loading">' . $langs->trans("Loading") . '...</div>';
+    print '</div>';
+    print '</div>';
+    print '</td>';
+    print '</tr>';
 }
 
 // Show message if no data
@@ -320,6 +380,101 @@ print '<a href="declarationtvaindex.php" class="butAction">' . $langs->trans("Ba
 print '</div>';
 print '</div>';
 
+// Add CSS for dropdown styling
+print '<style>
+.account-details {
+    background-color: #f8f9fa;
+    border: 1px solid #dee2e6;
+    border-radius: 4px;
+    margin: 10px 0;
+    padding: 15px;
+}
+
+.account-details-header {
+    font-weight: bold;
+    color: #495057;
+    margin-bottom: 10px;
+    padding-bottom: 5px;
+    border-bottom: 1px solid #dee2e6;
+}
+
+.account-details-content {
+    font-size: 0.9em;
+}
+
+.account-details table {
+    width: 100%;
+    border-collapse: collapse;
+    margin-top: 10px;
+}
+
+.account-details table th,
+.account-details table td {
+    padding: 8px;
+    text-align: left;
+    border: 1px solid #dee2e6;
+}
+
+.account-details table th {
+    background-color: #e9ecef;
+    font-weight: bold;
+}
+
+.account-details table tr:nth-child(even) {
+    background-color: #f8f9fa;
+}
+
+.loading {
+    text-align: center;
+    color: #6c757d;
+    font-style: italic;
+}
+</style>';
+
+// Add JavaScript for dropdown functionality
+print '<script>
+var loadedDetails = {};
+
+function toggleDetails(line) {
+    var detailsRow = document.getElementById("details_" + line);
+    var contentDiv = document.getElementById("content_" + line);
+    
+    if (detailsRow.style.display === "none") {
+        // Show the dropdown
+        detailsRow.style.display = "";
+        
+        // Load content if not already loaded
+        if (!loadedDetails[line]) {
+            loadLineDetails(line);
+        }
+    } else {
+        // Hide the dropdown
+        detailsRow.style.display = "none";
+    }
+}
+
+function loadLineDetails(line) {
+    var contentDiv = document.getElementById("content_" + line);
+    var declarationId = ' . $declarationtva->rowid . ';
+    
+    // Show loading
+    contentDiv.innerHTML = "<div class=\"loading\">' . $langs->trans("Loading") . '...</div>";
+    
+    // Make AJAX request to get line details
+    var xhr = new XMLHttpRequest();
+    xhr.open("GET", "declarationtva_line_details_ajax.php?declaration_id=" + declarationId + "&ca3_line=" + line, true);
+    xhr.onreadystatechange = function() {
+        if (xhr.readyState === 4 && xhr.status === 200) {
+            contentDiv.innerHTML = xhr.responseText;
+            loadedDetails[line] = true;
+        } else if (xhr.readyState === 4) {
+            contentDiv.innerHTML = "<div class=\"error\">' . $langs->trans("ErrorLoadingDetails") . '</div>";
+        }
+    };
+    xhr.send();
+}
+</script>';
+
 // Print footer
 llxFooter();
 ?>
diff --git a/langs/en_US/declarationtva.lang b/langs/en_US/declarationtva.lang
index 6485d2c..80ed3dd 100644
--- a/langs/en_US/declarationtva.lang
+++ b/langs/en_US/declarationtva.lang
@@ -457,3 +457,7 @@ Note = Note
 CalculatedLineNote = This line shows the detail of accounts used to calculate the CA-3 line. Amounts may differ slightly from the calculated total due to rounding.
 ErrorMissingParameters = Missing parameters
 NoDataFoundForLine = No data found for this line
+AccountBreakdown = Account Breakdown
+Loading = Loading...
+ErrorLoadingDetails = Error loading details
+Summary = Summary
diff --git a/langs/fr_FR/declarationtva.lang b/langs/fr_FR/declarationtva.lang
index 070d83b..465aef3 100644
--- a/langs/fr_FR/declarationtva.lang
+++ b/langs/fr_FR/declarationtva.lang
@@ -446,3 +446,7 @@ Note = Note
 CalculatedLineNote = Cette ligne montre le détail des comptes utilisés pour calculer la ligne CA-3. Les montants peuvent différer légèrement du total calculé en raison des arrondis.
 ErrorMissingParameters = Paramètres manquants
 NoDataFoundForLine = Aucune donnée trouvée pour cette ligne
+AccountBreakdown = Détail des comptes
+Loading = Chargement...
+ErrorLoadingDetails = Erreur lors du chargement des détails
+Summary = Résumé