diff --git a/admin.php b/admin.php
index a9a6958..8f6fdfc 100644
--- a/admin.php
+++ b/admin.php
@@ -68,6 +68,8 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
         ");
         $stmt->execute([$userId, $isDemo, json_encode($newSettings)]);
 
+        fociz_log_audit($userId, 'SETTINGS_UPDATED', 'integration', null, ['provider' => 'OUTLOOK', 'tenant_id' => $tenantId], 'SUCCESS', $adminUser['email']);
+
         $message = "Centrale Microsoft 365 instellingen (Agenda, E-mail & Teams) zijn succesvol opgeslagen.";
         $messageType = 'success';
     }
@@ -93,6 +95,8 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
         ");
         $stmt->execute([$userId, json_encode($existingSettings)]);
 
+        fociz_log_audit($userId, 'SETTINGS_UPDATED', 'integration', null, ['provider' => 'JIRA', 'domain' => $companyDomain], 'SUCCESS', $adminUser['email']);
+
         $message = "Standaard Atlassian Jira bedrijfsdomein is succesvol opgeslagen.";
         $messageType = 'success';
     }
@@ -136,6 +140,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
                 $stmt->execute([$filterCode, $filterName, $projectKey ?: null, $jqlClause, $description, $isActive, $sortOrder]);
                 $message = "Nieuw wachtrijfilter '{$filterName}' is succesvol toegevoegd.";
             }
+            fociz_log_audit($userId, 'SETTINGS_UPDATED', 'jira_queue_filter', $filterId ?: null, ['filter_code' => $filterCode, 'filter_name' => $filterName], 'SUCCESS', $adminUser['email']);
             $messageType = 'success';
         }
     }
@@ -146,6 +151,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
         if ($filterId > 0) {
             $stmt = $db->prepare("DELETE FROM jira_queue_filters WHERE id = ?");
             $stmt->execute([$filterId]);
+            fociz_log_audit($userId, 'SETTINGS_UPDATED', 'jira_queue_filter', $filterId, ['action' => 'delete'], 'SUCCESS', $adminUser['email']);
             $message = "Wachtrijfilter is succesvol verwijderd.";
             $messageType = 'success';
         }
@@ -160,6 +166,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
                 $fCode = trim($fCode);
                 $upd->execute([$fCode !== '' ? $fCode : null, (int)$uId]);
             }
+            fociz_log_audit($userId, 'SETTINGS_UPDATED', 'jira_assignments', null, [], 'SUCCESS', $adminUser['email']);
             $message = "Standaard Jira wachtrijtoewijzingen voor het team zijn succesvol opgeslagen.";
             $messageType = 'success';
         }
@@ -185,6 +192,8 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
         set_system_setting('pomodoro_break', $pomoBreak);
         set_system_setting('default_task_duration', $taskDuration);
 
+        fociz_log_audit($userId, 'SETTINGS_UPDATED', 'workday_settings', null, ['workday_start' => $workdayStart, 'workday_end' => $workdayEnd], 'SUCCESS', $adminUser['email']);
+
         $message = "Organisatie werkdagstandaarden zijn succesvol bijgewerkt.";
         $messageType = 'success';
     }
@@ -205,6 +214,8 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
         set_system_setting('ai_provider', $aiProvider);
         set_system_setting('ai_model', $aiModel);
 
+        fociz_log_audit($userId, 'SETTINGS_UPDATED', 'ai_settings', null, ['ai_enabled' => $aiEnabled, 'ai_provider' => $aiProvider, 'ai_model' => $aiModel], 'SUCCESS', $adminUser['email']);
+
         $message = "AI Co-Pilot instellingen zijn succesvol opgeslagen.";
         $messageType = 'success';
     }
@@ -297,6 +308,13 @@ try {
     error_log("Fout bij ophalen jira filters/users: " . $e->getMessage());
 }
 
+$auditLogs = [];
+try {
+    $auditLogs = $db->query("SELECT * FROM audit_logs ORDER BY created_at DESC LIMIT 50")->fetchAll() ?: [];
+} catch (Throwable $e) {
+    error_log("Fout bij ophalen audit logs: " . $e->getMessage());
+}
+
 $pageTitle = 'Systeembeheer & Integraties — Fociz';
 require_once __DIR__ . '/includes/header.php';
 ?>
@@ -1194,6 +1212,116 @@ require_once __DIR__ . '/includes/header.php';
 
         </div>
     </div>
+
+    <!-- Audit Trail Logboek (SOC 2 / ISO 27001) -->
+    <div class="fociz-card p-6 sm:p-7 space-y-5">
+        <div class="flex flex-col sm:flex-row sm:items-center justify-between gap-4 border-b border-slate-200 dark:border-slate-800 pb-5">
+            <div>
+                <div class="flex items-center space-x-2 text-indigo-600 dark:text-indigo-400 text-xs font-bold uppercase tracking-wider mb-1">
+                    <i data-lucide="shield-check" class="w-4 h-4"></i>
+                    <span>Compliance & Veiligheidslogboek (SOC 2 / ISO 27001)</span>
+                </div>
+                <h2 class="text-xl font-bold text-slate-900 dark:text-white tracking-tight">
+                    Onwijzigbare Audit Trail
+                </h2>
+                <p class="text-xs text-slate-500 dark:text-slate-400 mt-0.5">
+                    Centrale registratie van alle inlogpogingen, 2FA-verificaties, IP-detecties en beheerdersacties conform NIST SP 800-63B.
+                </p>
+            </div>
+            <div class="flex items-center space-x-2 flex-shrink-0">
+                <span class="inline-flex items-center px-2.5 py-1 rounded-full text-xs font-semibold bg-emerald-500/10 text-emerald-600 dark:text-emerald-400 border border-emerald-500/20">
+                    <span class="w-1.5 h-1.5 rounded-full bg-emerald-500 mr-1.5 animate-pulse"></span>
+                    Live Audit Logging Actief
+                </span>
+            </div>
+        </div>
+
+        <div class="overflow-x-auto">
+            <table class="w-full text-left text-xs text-slate-600 dark:text-slate-300">
+                <thead>
+                    <tr class="border-b border-slate-200 dark:border-slate-800 text-[11px] font-bold uppercase tracking-wider text-slate-400 dark:text-slate-500">
+                        <th class="py-3 px-3">Tijdstip</th>
+                        <th class="py-3 px-3">Gebruiker / Doel</th>
+                        <th class="py-3 px-3">Actie</th>
+                        <th class="py-3 px-3">IP-adres</th>
+                        <th class="py-3 px-3">Status</th>
+                        <th class="py-3 px-3">Details</th>
+                    </tr>
+                </thead>
+                <tbody class="divide-y divide-slate-100 dark:divide-slate-800/60 font-sans">
+                    <?php if (empty($auditLogs)): ?>
+                        <tr>
+                            <td colspan="6" class="py-8 text-center text-slate-400 dark:text-slate-500">
+                                <i data-lucide="inbox" class="w-8 h-8 mx-auto mb-2 opacity-40"></i>
+                                Nog geen beveiligingsgebeurtenissen geregistreerd.
+                            </td>
+                        </tr>
+                    <?php else: ?>
+                        <?php foreach ($auditLogs as $log): 
+                            $status = strtoupper($log['status'] ?? 'SUCCESS');
+                            $statusColor = match($status) {
+                                'SUCCESS' => 'bg-emerald-500/10 text-emerald-600 dark:text-emerald-400 border-emerald-500/20',
+                                'FAILED', 'FAILURE' => 'bg-rose-500/10 text-rose-600 dark:text-rose-400 border-rose-500/20',
+                                'WARNING' => 'bg-amber-500/10 text-amber-600 dark:text-amber-400 border-amber-500/20',
+                                'PENDING' => 'bg-sky-500/10 text-sky-600 dark:text-sky-400 border-sky-500/20',
+                                default   => 'bg-slate-500/10 text-slate-600 dark:text-slate-400 border-slate-500/20',
+                            };
+                            $action = $log['action'] ?? '';
+                            $actionBadge = match($action) {
+                                'LOGIN_SUCCESS' => 'bg-emerald-50 dark:bg-emerald-950/40 text-emerald-700 dark:text-emerald-300 border-emerald-200 dark:border-emerald-800/60',
+                                'LOGIN_FAILED', 'LOGIN_MFA_FAILED' => 'bg-rose-50 dark:bg-rose-950/40 text-rose-700 dark:text-rose-300 border-rose-200 dark:border-rose-800/60',
+                                'LOGIN_NEW_IP_CHALLENGE', 'IP_VERIFIED' => 'bg-sky-50 dark:bg-sky-950/40 text-sky-700 dark:text-sky-300 border-sky-200 dark:border-sky-800/60',
+                                'SETTINGS_UPDATED' => 'bg-purple-50 dark:bg-purple-950/40 text-purple-700 dark:text-purple-300 border-purple-200 dark:border-purple-800/60',
+                                'USER_INVITED', 'INVITE_RESENT', 'USER_REGISTERED_VIA_INVITE' => 'bg-indigo-50 dark:bg-indigo-950/40 text-indigo-700 dark:text-indigo-300 border-indigo-200 dark:border-indigo-800/60',
+                                'USER_DELETED', 'INVITE_REVOKED' => 'bg-amber-50 dark:bg-amber-950/40 text-amber-700 dark:text-amber-300 border-amber-200 dark:border-amber-800/60',
+                                default => 'bg-slate-100 dark:bg-slate-800 text-slate-700 dark:text-slate-300 border-slate-200 dark:border-slate-700',
+                            };
+                            $detailsStr = '';
+                            if (!empty($log['details'])) {
+                                $decoded = json_decode($log['details'], true);
+                                if (is_array($decoded)) {
+                                    $parts = [];
+                                    foreach ($decoded as $k => $v) {
+                                        if (is_scalar($v)) {
+                                            $parts[] = "{$k}: {$v}";
+                                        }
+                                    }
+                                    $detailsStr = implode(', ', $parts);
+                                } else {
+                                    $detailsStr = (string)$log['details'];
+                                }
+                            }
+                        ?>
+                        <tr class="hover:bg-slate-50 dark:hover:bg-slate-800/40 transition">
+                            <td class="py-2.5 px-3 font-mono text-[11px] text-slate-500 whitespace-nowrap">
+                                <?= date('d-m-Y H:i:s', strtotime($log['created_at'])) ?>
+                            </td>
+                            <td class="py-2.5 px-3 font-medium text-slate-800 dark:text-slate-200 max-w-[200px] truncate" title="<?= htmlspecialchars($log['user_email'] ?? 'Systeem') ?>">
+                                <?= htmlspecialchars($log['user_email'] ?? 'Systeem / Onbekend') ?>
+                            </td>
+                            <td class="py-2.5 px-3 whitespace-nowrap">
+                                <span class="inline-flex items-center px-2 py-0.5 rounded text-[11px] font-mono font-medium border <?= $actionBadge ?>">
+                                    <?= htmlspecialchars($action) ?>
+                                </span>
+                            </td>
+                            <td class="py-2.5 px-3 font-mono text-[11px] text-slate-500 whitespace-nowrap">
+                                <?= htmlspecialchars($log['ip_address'] ?? '—') ?>
+                            </td>
+                            <td class="py-2.5 px-3 whitespace-nowrap">
+                                <span class="inline-flex items-center px-2 py-0.5 rounded-full text-[10px] font-bold border <?= $statusColor ?>">
+                                    <?= htmlspecialchars($status) ?>
+                                </span>
+                            </td>
+                            <td class="py-2.5 px-3 text-[11px] text-slate-500 max-w-[280px] truncate" title="<?= htmlspecialchars($detailsStr) ?>">
+                                <?= htmlspecialchars($detailsStr ?: '—') ?>
+                            </td>
+                        </tr>
+                        <?php endforeach; ?>
+                    <?php endif; ?>
+                </tbody>
+            </table>
+        </div>
+    </div>
 </div>
 
 <script>
diff --git a/api/board.php b/api/board.php
index ff2cc6a..f8b0581 100644
--- a/api/board.php
+++ b/api/board.php
@@ -274,7 +274,9 @@ try {
             $stmt = $db->prepare("UPDATE board_lanes SET title = ?, color = ? WHERE id = ? AND board_id = ?");
             $stmt->execute([$title, $color, $laneId, $boardId]);
         } else {
-            $maxPos = (int)$db->query("SELECT COALESCE(MAX(position), -1) FROM board_lanes WHERE board_id = {$boardId}")->fetchColumn();
+            $stmtMax = $db->prepare("SELECT COALESCE(MAX(position), -1) FROM board_lanes WHERE board_id = ?");
+            $stmtMax->execute([$boardId]);
+            $maxPos = (int)$stmtMax->fetchColumn();
             $stmt = $db->prepare("INSERT INTO board_lanes (board_id, title, color, position) VALUES (?, ?, ?, ?)");
             $stmt->execute([$boardId, $title, $color, $maxPos + 1]);
             $laneId = (int)$db->lastInsertId();
@@ -296,7 +298,9 @@ try {
         }
 
         // Controleer of er kaarten in staan
-        $cardCount = (int)$db->query("SELECT COUNT(*) FROM board_cards WHERE lane_id = {$laneId}")->fetchColumn();
+        $stmtCardCnt = $db->prepare("SELECT COUNT(*) FROM board_cards WHERE lane_id = ?");
+        $stmtCardCnt->execute([$laneId]);
+        $cardCount = (int)$stmtCardCnt->fetchColumn();
         if ($cardCount > 0) {
             echo json_encode(['success' => false, 'error' => 'Verplaats of verwijder eerst de taken in deze kolom alvorens de kolom te verwijderen.']);
             exit;
@@ -337,7 +341,9 @@ try {
             ");
             $stmt->execute([$title, $description, $assigneeId, $priority, $color, $laneId, $cardId, $boardId]);
         } else {
-            $maxPos = (int)$db->query("SELECT COALESCE(MAX(position), -1) FROM board_cards WHERE lane_id = {$laneId}")->fetchColumn();
+            $stmtMax = $db->prepare("SELECT COALESCE(MAX(position), -1) FROM board_cards WHERE lane_id = ?");
+            $stmtMax->execute([$laneId]);
+            $maxPos = (int)$stmtMax->fetchColumn();
             $stmt = $db->prepare("
                 INSERT INTO board_cards (board_id, lane_id, title, description, assignee_id, priority, color, position, created_by_id)
                 VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
@@ -563,10 +569,14 @@ try {
 
         // Als geen lane_id is meegegeven, pak de 1e lane van het bord
         if ($laneId <= 0) {
-            $laneId = (int)$db->query("SELECT id FROM board_lanes WHERE board_id = {$boardId} ORDER BY position ASC, id ASC LIMIT 1")->fetchColumn();
+            $stmtLane = $db->prepare("SELECT id FROM board_lanes WHERE board_id = ? ORDER BY position ASC, id ASC LIMIT 1");
+            $stmtLane->execute([$boardId]);
+            $laneId = (int)$stmtLane->fetchColumn();
         }
 
-        $maxPos = (int)$db->query("SELECT COALESCE(MAX(position), -1) FROM board_cards WHERE lane_id = {$laneId}")->fetchColumn();
+        $stmtMax = $db->prepare("SELECT COALESCE(MAX(position), -1) FROM board_cards WHERE lane_id = ?");
+        $stmtMax->execute([$laneId]);
+        $maxPos = (int)$stmtMax->fetchColumn();
         $stmt = $db->prepare("
             INSERT INTO board_cards (board_id, lane_id, title, description, assignee_id, priority, color, position, created_by_id)
             VALUES (?, ?, ?, '', NULL, 'P2', 'yellow', ?, ?)
diff --git a/auth/invite.php b/auth/invite.php
index 27fddb9..d4a348f 100644
--- a/auth/invite.php
+++ b/auth/invite.php
@@ -39,8 +39,8 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
 
     if (empty($name) || empty($password) || empty($totpCode)) {
         $error = "Alle velden (inclusief 2FA verificatiecode) zijn verplicht.";
-    } elseif (strlen($password) < 8) {
-        $error = "Het wachtwoord moet minimaal 8 tekens lang zijn.";
+    } elseif (($pwErr = fociz_validate_password($password)) !== null) {
+        $error = $pwErr;
     } elseif ($password !== $confirmPassword) {
         $error = "Wachtwoorden komen niet overeen.";
     } elseif (!TOTP::verifyCode($secret, $totpCode)) {
@@ -75,6 +75,8 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
 
             $db->commit();
 
+            fociz_log_audit($newUserId, 'USER_REGISTERED_VIA_INVITE', 'user', $newUserId, ['email' => $invite['email'], 'role' => $invite['role']], 'SUCCESS', $invite['email']);
+
             // Start dagsessie (geldig tot 23:59:59)
             $_SESSION['user_id'] = $newUserId;
             $_SESSION['user_name'] = $name;
diff --git a/auth/login.php b/auth/login.php
index e27c6fe..60ed6cd 100644
--- a/auth/login.php
+++ b/auth/login.php
@@ -74,6 +74,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
                 if (!$isIpKnown) {
                     // Stuur verificatie-mail en informeer gebruiker
                     fociz_send_new_ip_verification((int)$user['id'], $user['email'], $user['name'], $clientIp);
+                    fociz_log_audit((int)$user['id'], 'LOGIN_NEW_IP_CHALLENGE', 'user', (int)$user['id'], ['ip' => $clientIp], 'PENDING', $user['email']);
                     $error = "Nieuwe inloglocatie gedetecteerd ({$clientIp}). Er is een verificatie-e-mail gestuurd naar {$user['email']}. Klik op de link in de e-mail om deze locatie toe te staan.";
                 } else {
                     // Succesvol stap 1: zet tijdelijke pending sessie voor 2FA
@@ -87,6 +88,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
                 if (!empty($email)) {
                     fociz_hit_rate_limit($emailRateKey, 900);
                 }
+                fociz_log_audit($user ? (int)$user['id'] : null, 'LOGIN_FAILED', 'user', $user ? (int)$user['id'] : null, ['reason' => 'Invalid credentials', 'ip' => $clientIp], 'FAILURE', $email);
                 $error = "Onjuist e-mailadres of wachtwoord.";
             }
         }
@@ -159,6 +161,8 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
                 // Dagsessie-token uitgeven (strikt geldig tot 23:59:59 van vandaag)
                 issue_day_session_token((int)$user['id']);
 
+                fociz_log_audit((int)$user['id'], 'LOGIN_SUCCESS', 'user', (int)$user['id'], ['ip' => $clientIp, 'auth_method' => 'PASSWORD+2FA'], 'SUCCESS', $user['email']);
+
                 unset($_SESSION['pending_2fa_user_id'], $_SESSION['pending_2fa_user_email'], $_SESSION['pending_2fa_user_name']);
 
                 header('Location: /planner.php');
@@ -166,6 +170,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
             } else {
                 fociz_hit_rate_limit($totpRateKey, 900);
                 fociz_hit_rate_limit($ipRateKey, 900);
+                fociz_log_audit((int)$userId, 'LOGIN_MFA_FAILED', 'user', (int)$userId, ['ip' => $clientIp], 'FAILURE', $_SESSION['pending_2fa_user_email'] ?? null);
                 $error = "Onjuiste 2FA code. Controleer uw authenticator app en probeer opnieuw.";
             }
         }
diff --git a/auth/reset-password.php b/auth/reset-password.php
index dba0e31..a07c0d2 100644
--- a/auth/reset-password.php
+++ b/auth/reset-password.php
@@ -37,8 +37,8 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST' && $resetRecord) {
 
     if (empty($password)) {
         $error = "Vul een nieuw wachtwoord in.";
-    } elseif (strlen($password) < 8) {
-        $error = "Het wachtwoord moet minimaal 8 tekens lang zijn.";
+    } elseif (($pwErr = fociz_validate_password($password)) !== null) {
+        $error = $pwErr;
     } elseif ($password !== $confirmPassword) {
         $error = "De wachtwoorden komen niet overeen.";
     } else {
@@ -62,6 +62,8 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST' && $resetRecord) {
             $db->commit();
             $success = true;
 
+            fociz_log_audit(null, 'PASSWORD_RESET_COMPLETED', 'user', null, ['email' => $resetRecord['user_email']], 'SUCCESS', $resetRecord['user_email']);
+
         } catch (Throwable $e) {
             if ($db->inTransaction()) $db->rollBack();
             error_log("Fout bij resetten wachtwoord: " . $e->getMessage());
diff --git a/auth/setup.php b/auth/setup.php
index e8d01b1..993ba6a 100644
--- a/auth/setup.php
+++ b/auth/setup.php
@@ -35,8 +35,8 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
         $error = "Alle velden (inclusief de 2FA verificatiecode) zijn verplicht.";
     } elseif (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
         $error = "Voer een geldig e-mailadres in.";
-    } elseif (strlen($password) < 8) {
-        $error = "Het wachtwoord moet minimaal 8 tekens bevatten.";
+    } elseif (($pwErr = fociz_validate_password($password)) !== null) {
+        $error = $pwErr;
     } elseif ($password !== $confirmPassword) {
         $error = "De ingevoerde wachtwoorden komen niet overeen.";
     } elseif (!TOTP::verifyCode($secret, $totpCode)) {
@@ -73,6 +73,8 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
             clear_remember_cookie();
             unset($_SESSION['setup_totp_secret']);
 
+            fociz_log_audit($adminId, 'INITIAL_ADMIN_SETUP', 'user', $adminId, ['email' => $email, 'name' => $name], 'SUCCESS', $email);
+
             $success = true;
         } catch (Exception $e) {
             $error = "Fout bij aanmaken beheerder in MariaDB: " . $e->getMessage();
diff --git a/auth/verify-ip.php b/auth/verify-ip.php
index 0892c25..68f72e7 100644
--- a/auth/verify-ip.php
+++ b/auth/verify-ip.php
@@ -1,4 +1,4 @@
-<?php
+<?php
 /**
  * Fociz Nieuwe Inloglocatie / IP Verificatie
  */
@@ -43,6 +43,7 @@ if (empty($token) || !preg_match('/^[a-f0-9]{64}$/', $token)) {
             $success = true;
             $userEmail = $record['email'];
             $ipAddress = $record['ip_address'];
+            fociz_log_audit((int)$record['user_id'], 'IP_VERIFIED', 'user_known_ips', (int)$record['id'], ['ip' => $ipAddress], 'SUCCESS', $userEmail);
         }
     } catch (Throwable $e) {
         error_log("verify-ip.php error: " . $e->getMessage());
diff --git a/config/database.php b/config/database.php
index 0059fff..ae28134 100644
--- a/config/database.php
+++ b/config/database.php
@@ -160,6 +160,8 @@ function ensure_tables_exist(PDO $pdo): void {
             "ALTER TABLE users ADD COLUMN last_login_ip VARCHAR(45) NULL AFTER last_jira_check_at",
             "ALTER TABLE users ADD COLUMN last_login_at DATETIME NULL AFTER last_login_ip",
             "CREATE TABLE IF NOT EXISTS `user_known_ips` (`id` INT AUTO_INCREMENT PRIMARY KEY, `user_id` INT NOT NULL, `ip_address` VARCHAR(45) NOT NULL, `user_agent` VARCHAR(255) NULL, `is_verified` TINYINT(1) NOT NULL DEFAULT 1, `verify_token` VARCHAR(64) NULL, `verify_token_expires_at` DATETIME NULL, `first_seen_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP, `last_seen_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, UNIQUE KEY `uk_user_ip` (`user_id`, `ip_address`), INDEX (`verify_token`)) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci",
+            // SOC 2 & ISO 27001: Onwijzigbare Audit Trail
+            "CREATE TABLE IF NOT EXISTS `audit_logs` (`id` INT AUTO_INCREMENT PRIMARY KEY, `user_id` INT NULL, `user_email` VARCHAR(191) NULL, `action` VARCHAR(64) NOT NULL, `resource_type` VARCHAR(64) NULL, `resource_id` INT NULL, `details` TEXT NULL, `ip_address` VARCHAR(45) NOT NULL, `user_agent` VARCHAR(255) NULL, `status` ENUM('SUCCESS', 'FAILED', 'WARNING', 'PENDING') NOT NULL DEFAULT 'SUCCESS', `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP, INDEX (`user_id`), INDEX (`action`), INDEX (`created_at`)) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci",
         ];
         foreach ($colUpgrades as $sql) {
             try {
diff --git a/config/schema.sql b/config/schema.sql
index 407feb7..c7a3ed7 100644
--- a/config/schema.sql
+++ b/config/schema.sql
@@ -275,3 +275,21 @@ CREATE TABLE IF NOT EXISTS `user_known_ips` (
   INDEX (`verify_token`),
   CONSTRAINT `fk_known_ips_user` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE CASCADE
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+-- Fociz SOC 2 & ISO 27001: Onwijzigbare Audit Trail (Beveiligings- en beheeracties)
+CREATE TABLE IF NOT EXISTS `audit_logs` (
+  `id` INT AUTO_INCREMENT PRIMARY KEY,
+  `user_id` INT NULL,
+  `user_email` VARCHAR(191) NULL,
+  `action` VARCHAR(64) NOT NULL,
+  `resource_type` VARCHAR(64) NULL,
+  `resource_id` INT NULL,
+  `details` TEXT NULL,
+  `ip_address` VARCHAR(45) NOT NULL,
+  `user_agent` VARCHAR(255) NULL,
+  `status` ENUM('SUCCESS', 'FAILED', 'WARNING', 'PENDING') NOT NULL DEFAULT 'SUCCESS',
+  `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  INDEX (`user_id`),
+  INDEX (`action`),
+  INDEX (`created_at`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
diff --git a/includes/auth.php b/includes/auth.php
index b630ba5..a0f0afb 100644
--- a/includes/auth.php
+++ b/includes/auth.php
@@ -87,6 +87,83 @@ function fociz_get_client_ip(): string {
     return $_SERVER['REMOTE_ADDR'] ?? '127.0.0.1';
 }
 
+/**
+ * SOC 2 & ISO 27001 Audit Trail logger
+ * Schrijft alle beveiligings- en beheeracties onweerlegbaar weg naar de audit_logs tabel
+ */
+function fociz_log_audit(?int $userId, string $action, string $resourceType = '', ?int $resourceId = null, $details = null, string $status = 'SUCCESS', ?string $userEmail = null): void {
+    try {
+        $db = get_db_connection();
+        $ip = fociz_get_client_ip();
+        $ua = substr($_SERVER['HTTP_USER_AGENT'] ?? '', 0, 255);
+
+        // Indien email niet meegegeven, zoek op basis van userId
+        if (empty($userEmail) && !empty($userId)) {
+            $stmtU = $db->prepare("SELECT email FROM users WHERE id = ?");
+            $stmtU->execute([$userId]);
+            $userEmail = $stmtU->fetchColumn() ?: null;
+        }
+
+        $detailsJson = is_array($details) || is_object($details) ? json_encode($details, JSON_UNESCAPED_UNICODE) : (is_string($details) ? $details : null);
+
+        $statusNormalized = strtoupper($status);
+        if ($statusNormalized === 'FAILURE') {
+            $statusNormalized = 'FAILED';
+        }
+        if (!in_array($statusNormalized, ['SUCCESS', 'FAILED', 'WARNING', 'PENDING'])) {
+            $statusNormalized = 'SUCCESS';
+        }
+
+        $stmt = $db->prepare("
+            INSERT INTO audit_logs (user_id, user_email, action, resource_type, resource_id, details, ip_address, user_agent, status, created_at)
+            VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, NOW())
+        ");
+        $stmt->execute([
+            $userId ?: null,
+            $userEmail ?: null,
+            $action,
+            $resourceType ?: null,
+            $resourceId ?: null,
+            $detailsJson,
+            $ip,
+            $ua,
+            $statusNormalized
+        ]);
+    } catch (Throwable $e) {
+        // Audit log mag NOOIT de applicatiewerking breken
+        error_log("fociz_log_audit failure: " . $e->getMessage());
+    }
+}
+
+/**
+ * NIST SP 800-63B / ISO 27001 Wachtwoordvalidator
+ * Vereist:
+ * - Minimaal 12 tekens
+ * - Minstens 1 hoofdletter (A-Z)
+ * - Minstens 1 kleine letter (a-z)
+ * - Minstens 1 cijfer (0-9)
+ * - Minstens 1 speciaal teken (!@#$%^&*()_+-=[]{}|;:,.<>?)
+ * Geeft null terug indien geldig, of een duidelijke foutmelding in het Nederlands
+ */
+function fociz_validate_password(string $password): ?string {
+    if (strlen($password) < 12) {
+        return "Het wachtwoord moet minimaal 12 tekens lang zijn conform het beveiligingsbeleid.";
+    }
+    if (!preg_match('/[A-Z]/', $password)) {
+        return "Het wachtwoord moet minimaal één hoofdletter (A-Z) bevatten.";
+    }
+    if (!preg_match('/[a-z]/', $password)) {
+        return "Het wachtwoord moet minimaal één kleine letter (a-z) bevatten.";
+    }
+    if (!preg_match('/[0-9]/', $password)) {
+        return "Het wachtwoord moet minimaal één cijfer (0-9) bevatten.";
+    }
+    if (!preg_match('/[^A-Za-z0-9]/', $password)) {
+        return "Het wachtwoord moet minimaal één speciaal teken of leesteken bevatten.";
+    }
+    return null;
+}
+
 /**
  * Genereert een sessie fingerprint op basis van IP en browser/platform
  */
@@ -395,6 +472,18 @@ function get_logged_in_user(): ?array {
 
     // 2. Controleer actieve PHP sessie (mits behorend bij vandaag én hetzelfde IP/fingerprint)
     if (!empty($_SESSION['user_id']) && !empty($_SESSION['is_2fa_verified'])) {
+        // Inactiviteitstimeout (ISO 27001 / SOC 2): 120 minuten (7200s)
+        $maxIdleSeconds = 7200;
+        if (!empty($_SESSION['last_activity']) && ($now - (int)$_SESSION['last_activity']) > $maxIdleSeconds) {
+            fociz_log_audit((int)$_SESSION['user_id'], 'SESSION_IDLE_TIMEOUT', 'users', (int)$_SESSION['user_id'], ['idle_seconds' => $now - (int)$_SESSION['last_activity']], 'WARNING');
+            $_SESSION = ['session_was_expired' => true, 'idle_timeout' => true];
+            clear_day_session_cookie();
+            if (session_status() === PHP_SESSION_ACTIVE) {
+                @session_regenerate_id(true);
+            }
+            return null;
+        }
+
         // IP-verificatie: als het IP/locatie tussentijds verandert, moet er opnieuw worden ingelogd
         if (!empty($_SESSION['auth_fingerprint']) && $_SESSION['auth_fingerprint'] !== $clientFingerprint) {
             $_SESSION = ['session_was_expired' => true, 'ip_changed' => true];
diff --git a/profile.php b/profile.php
index 6d9e7af..f3cc028 100644
--- a/profile.php
+++ b/profile.php
@@ -175,8 +175,8 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
         if (!password_verify($currentPassword, $storedHash)) {
             $message = "Uw huidige wachtwoord is niet correct ingevoerd.";
             $messageType = 'error';
-        } elseif (strlen($newPassword) < 8) {
-            $message = "Het nieuwe wachtwoord moet minimaal 8 tekens lang zijn.";
+        } elseif (($pwErr = fociz_validate_password($newPassword)) !== null) {
+            $message = $pwErr;
             $messageType = 'error';
         } elseif ($newPassword !== $confirmPassword) {
             $message = "Het nieuwe wachtwoord en de bevestiging komen niet overeen.";
@@ -185,6 +185,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
             $newHash = password_hash($newPassword, PASSWORD_DEFAULT);
             $stmtUp = $db->prepare("UPDATE users SET password_hash = ? WHERE id = ?");
             $stmtUp->execute([$newHash, $userId]);
+            fociz_log_audit($userId, 'PASSWORD_CHANGED', 'user', $userId, ['method' => 'profile'], 'SUCCESS', $user['email']);
             $message = "Uw wachtwoord is succesvol gewijzigd.";
             $messageType = 'success';
         }
diff --git a/users.php b/users.php
index 017b6ca..3f00294 100644
--- a/users.php
+++ b/users.php
@@ -39,6 +39,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
 
                 // Verstuur de gestylede uitnodigingsmail direct via SMTP
                 $mailResult = FocizMailer::sendInvitationEmail($email, $adminUser['name'], $role, $generatedLink);
+                fociz_log_audit((int)$adminUser['id'], 'USER_INVITED', 'invite', null, ['email' => $email, 'role' => $role], 'SUCCESS', $adminUser['email']);
                 if ($mailResult['success']) {
                     $message = "Uitnodigingslink succesvol aangemaakt én per e-mail verzonden naar {$email}!";
                 } else {
@@ -55,6 +56,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
             $baseUrl = rtrim(APP_URL, '/');
             $link = "{$baseUrl}/auth/invite.php?token={$inv['token']}";
             $mailResult = FocizMailer::sendInvitationEmail($inv['email'], $adminUser['name'], $inv['role'], $link);
+            fociz_log_audit((int)$adminUser['id'], 'INVITE_RESENT', 'invite', $inviteId, ['email' => $inv['email'], 'role' => $inv['role']], 'SUCCESS', $adminUser['email']);
             if ($mailResult['success']) {
                 $message = "Uitnodiging succesvol opnieuw per e-mail verzonden naar {$inv['email']}!";
             } else {
@@ -67,13 +69,20 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
         $inviteId = (int)($_POST['invite_id'] ?? 0);
         $stmtDel = $db->prepare("DELETE FROM invites WHERE id = ?");
         $stmtDel->execute([$inviteId]);
+        fociz_log_audit((int)$adminUser['id'], 'INVITE_REVOKED', 'invite', $inviteId, [], 'SUCCESS', $adminUser['email']);
         header('Location: /users.php');
         exit;
     } elseif ($action === 'delete_user') {
         $delUserId = (int)($_POST['user_id'] ?? 0);
         if ($delUserId !== (int)$adminUser['id']) {
+            $stmtUserToDel = $db->prepare("SELECT email, name FROM users WHERE id = ?");
+            $stmtUserToDel->execute([$delUserId]);
+            $delUser = $stmtUserToDel->fetch();
+
             $stmtDelUser = $db->prepare("DELETE FROM users WHERE id = ?");
             $stmtDelUser->execute([$delUserId]);
+
+            fociz_log_audit((int)$adminUser['id'], 'USER_DELETED', 'user', $delUserId, ['deleted_email' => $delUser['email'] ?? null, 'deleted_name' => $delUser['name'] ?? null], 'SUCCESS', $adminUser['email']);
         }
         header('Location: /users.php');
         exit;