diff --git a/TODO.md b/TODO.md
index 6f8a002..57e3357 100644
--- a/TODO.md
+++ b/TODO.md
@@ -1,29 +1,9 @@
-- [x] Analyze nginx/docs and nginx/scripts for deduplication opportunities
-- [x] Deduplicate nginx documentation files (removed DEPLOYMENT_COMPLETE.md, DEPLOY_NOW.md)
-- [x] Remove duplicate scripts (deploy-production.sh, deploy-production-new.sh, manage-admin-users.sh)
-- [x] Update justfile with new script paths
-- [x] Update top-level README.md
-- [x] Update nginx/README.md
-- [x] Create nginx/SETUP.md
-- [x] Create top-level SETUP.md
-- [x] Update documentation paths (/var/www/html/ → /var/www/posterg/, /formulaire/ → /admin/)
-- [x] Remove nginx/scripts/ entirely (install-php-sqlite.sh was duplicate, fix-paths.sh was stale, setup-password.sh superseded by manage-admin-users.sh)
-- [x] Fix typo HTACCESS_TO_ NGINX.md → HTACCESS_TO_NGINX.md in nginx/README.md
-- [x] Fix nginx/SETUP.md manual step to use just manage-admin-users instead of raw htpasswd
-- [x] Fix root README.md dead reference to docs/TODO.SECURITY.md
-- [x] Update root README.md project structure (remove nginx/scripts/ entry)
-- [x] Form default visibility: "Interne" (access_type_id=2) set at DB insert level
-- [x] New TFE always created unpublished (is_published=0 hardcoded in createThesis)
-- [x] Contact checkbox: `show_contact` column on authors; checkbox in add/edit forms; tfe.php shows contact only if enabled
-- [x] Migration 008: site_settings table + show_contact column + rebuilt views with author_email/author_show_contact/access_type_id
-- [x] Formulaire section in parametres.php: toggle switches for Interdit/Interne/Libre access types
-- [x] Libre option disabled by default (access_type_libre_enabled=0)
-- [x] Add visibility select in add.php, filtered by enabled access types, defaulting to Interne
-- [x] Edit.php: pre-populate contact email from DB; show contact_public checkbox with current state
-- [x] tfe.php: contact shown from author_email+show_contact; baiu_link relabeled as "Lien"
-- [x] actions/settings.php: handler for formulaire settings form
-- [x] CSS: admin-toggle pill switches + admin-settings-toggles layout + admin-form-group
-- [x] Fix undefined $from– variable in admin/index.php (brace-interpolate around en-dash)
-- [x] Add delete single entry to admin table (delete action + handler)
-- [x] Add batch delete to bulk actions bar
-- [x] Add sortable columns to admin table (click column headers to sort)
+# TODO
+
+## Paramètres page cleanup
+- [x] Remove card syntax (`.admin-settings-section` border/radius containers)
+- [x] Replace pill toggles with native semantic checkboxes inside `<fieldset>`
+- [x] Move "delete all TFE" danger zone into Maintenance section
+- [x] Use `<fieldset>` for danger zones (semantic, with `<legend>` instead of `<div>`)
+- [x] Update CSS: new `.param-*` classes for flat semantic layout
+- [x] Exclude parametres sections from generic `.admin-body main > section` card styling via `aria-labelledby` prefix
diff --git a/public/admin/actions/delete.php b/public/admin/actions/delete.php
index 358e1ae..2c8c237 100644
--- a/public/admin/actions/delete.php
+++ b/public/admin/actions/delete.php
@@ -14,12 +14,17 @@ if (!isset($_POST['csrf_token'], $_SESSION['csrf_token'])
     exit;
 }
 
-$isBulk = !empty($_POST['bulk']);
+$isBulk      = !empty($_POST['bulk']);
+$isDeleteAll = !empty($_POST['delete_all']);
 
 try {
     $db = new Database();
 
-    if ($isBulk) {
+    if ($isDeleteAll) {
+        $count = $db->deleteAllTheses();
+        App::flash('success', "$count TFE(s) supprimé(s) avec succès.");
+
+    } elseif ($isBulk) {
         $ids = array_filter(array_map('intval', $_POST['selected_theses'] ?? []), fn($id) => $id > 0);
 
         if (empty($ids)) {
diff --git a/public/admin/index.php b/public/admin/index.php
index 23143c4..ad134ad 100644
--- a/public/admin/index.php
+++ b/public/admin/index.php
@@ -385,7 +385,7 @@ document.addEventListener('DOMContentLoaded', () => {
         $from = $offset + 1;
         $to   = min($offset + $perPage, $totalCount);
         if ($totalPages > 1) {
-            echo "{$from}–{$to} sur {$totalCount} TFE";
+            echo "{$from}-{$to} sur {$totalCount} TFE";
         } else {
             echo "$totalCount TFE";
         }
@@ -499,21 +499,24 @@ document.addEventListener('DOMContentLoaded', () => {
                 onclick="document.getElementById('import-dialog').close()">&#x2715;</button>
     </div>
 
-    <?php if (!empty($importErrors)): ?>
-    <div role="alert" data-type="error" class="admin-dialog__alert">
-        <strong>⚠ Erreurs :</strong>
-        <ul class="admin-error-list">
-            <?php foreach ($importErrors as $err): ?>
-                <li><?= htmlspecialchars($err) ?></li>
-            <?php endforeach; ?>
-        </ul>
+    <?php if ($importMessage || !empty($importErrors)): ?>
+    <div class="admin-import-status-card">
+        <?php if (!empty($importErrors)): ?>
+        <div role="alert" class="admin-import-status-card__errors">
+            <strong>⚠ Erreurs :</strong>
+            <ul class="admin-error-list">
+                <?php foreach ($importErrors as $err): ?>
+                    <li><?= htmlspecialchars($err) ?></li>
+                <?php endforeach; ?>
+            </ul>
+        </div>
+        <?php endif; ?>
+        <?php if ($importMessage): ?>
+        <p role="status" class="admin-import-status-card__success">✓ <?= htmlspecialchars($importMessage) ?></p>
+        <?php endif; ?>
     </div>
     <?php endif; ?>
 
-    <?php if ($importMessage): ?>
-    <p role="status" data-type="success">✓ <?= htmlspecialchars($importMessage) ?></p>
-    <?php endif; ?>
-
     <form method="post" enctype="multipart/form-data" class="admin-form">
         <input type="hidden" name="csrf_token" value="<?= htmlspecialchars($_SESSION['csrf_token']) ?>">
 
@@ -536,18 +539,18 @@ document.addEventListener('DOMContentLoaded', () => {
     </form>
 
     <?php if (!empty($importResults)): ?>
-    <div class="admin-import-results">
-        <h3 class="admin-import-results__title">Résultats</h3>
+    <details class="admin-import-log-details">
+        <summary>Logs d'importation (<?= count($importResults) ?> entrées)</summary>
         <ul class="admin-import-log">
             <?php foreach ($importResults as $r): ?>
             <li class="admin-import-log__item admin-import-log__item--<?= $r['type'] ?>"><?= htmlspecialchars($r['msg']) ?></li>
             <?php endforeach; ?>
         </ul>
-    </div>
+    </details>
     <?php endif; ?>
 </dialog>
 
-<?php if ($importDone || !empty($importErrors)): ?>
+<?php if ($importMessage || !empty($importErrors)): ?>
 <script>document.getElementById('import-dialog').showModal();</script>
 <?php endif; ?>
 
diff --git a/public/admin/parametres.php b/public/admin/parametres.php
index 145703c..006a5b3 100644
--- a/public/admin/parametres.php
+++ b/public/admin/parametres.php
@@ -12,6 +12,7 @@ $maintenanceOn   = file_exists(APP_ROOT . '/storage/maintenance.flag');
 require_once APP_ROOT . '/src/Database.php';
 $db = new Database();
 $siteSettings = $db->getAllSettings();
+$stats = $db->getThesesStats();
 
 if (empty($_SESSION['csrf_token'])) {
     $_SESSION['csrf_token'] = bin2hex(random_bytes(32));
@@ -26,179 +27,174 @@ if (empty($_SESSION['csrf_token'])) {
     <?php include APP_ROOT . '/templates/partials/flash-messages.php'; ?>
 
     <!-- ══════════════════════════════════════════════════════════════
-         SECTION 1 — Maintenance
+         MAINTENANCE
     ══════════════════════════════════════════════════════════════ -->
-    <section class="admin-settings-section" aria-labelledby="settings-maintenance-title">
-        <h2 class="admin-settings-section__title" id="settings-maintenance-title">Maintenance</h2>
+    <section aria-labelledby="settings-maintenance-title">
+        <h2 id="settings-maintenance-title">Maintenance</h2>
 
-        <div class="admin-maintenance-status <?= $maintenanceOn ? 'admin-maintenance-status--active' : '' ?>">
+        <div class="param-maintenance-row">
             <?php if ($maintenanceOn): ?>
-                <p class="admin-maintenance-status__msg">
+                <p>
                     <strong>⚠ Mode maintenance activé</strong> — le site public est inaccessible.
                 </p>
                 <form method="post" action="actions/maintenance.php">
                     <input type="hidden" name="csrf_token" value="<?= htmlspecialchars($_SESSION['csrf_token']) ?>">
                     <input type="hidden" name="action" value="disable_maintenance">
                     <input type="hidden" name="redirect" value="/admin/parametres.php">
-                    <button type="submit" class="admin-btn admin-btn--sm">Désactiver la maintenance</button>
+                    <button type="submit">Désactiver la maintenance</button>
                 </form>
             <?php else: ?>
-                <p class="admin-maintenance-status__msg">
-                    Site public : <strong>en ligne</strong>
-                </p>
+                <p>Site public : <strong>en ligne</strong></p>
                 <form method="post" action="actions/maintenance.php">
                     <input type="hidden" name="csrf_token" value="<?= htmlspecialchars($_SESSION['csrf_token']) ?>">
                     <input type="hidden" name="action" value="enable_maintenance">
                     <input type="hidden" name="redirect" value="/admin/parametres.php">
-                    <button type="submit" class="admin-btn admin-btn--sm admin-btn--warning"
+                    <button type="submit" class="param-btn-warning"
                             onclick="return confirm('Mettre le site en maintenance ? Les visiteurs verront une page 503.')">
                         Activer la maintenance
                     </button>
                 </form>
             <?php endif; ?>
         </div>
+
+        <!-- Danger zone: delete all TFE → now inside maintenance -->
+        <fieldset class="param-danger-zone">
+            <legend>Supprimer tous les TFE</legend>
+            <p>
+                Supprime définitivement tous les TFE de la base de données, y compris auteurs,
+                promoteurs, tags, fichiers associés. Cette action est <strong>irréversible</strong>.
+            </p>
+            <form method="post" action="actions/delete.php"
+                  onsubmit="return confirm('⚠ Supprimer définitivement TOUS les TFE ? Cette action est IRRÉVERSIBLE.')">
+                <input type="hidden" name="csrf_token" value="<?= htmlspecialchars($_SESSION['csrf_token']) ?>">
+                <input type="hidden" name="delete_all" value="1">
+                <button type="submit" class="param-btn-danger">Supprimer tous les TFE (<?= $stats['total'] ?? '?' ?>)</button>
+            </form>
+        </fieldset>
     </section>
 
     <!-- ══════════════════════════════════════════════════════════════
-         SECTION 2 — Formulaire
+         FORMULAIRE
     ══════════════════════════════════════════════════════════════ -->
-    <section class="admin-settings-section" aria-labelledby="settings-formulaire-title">
-        <h2 class="admin-settings-section__title" id="settings-formulaire-title">Formulaire</h2>
-
+    <section aria-labelledby="settings-formulaire-title">
+        <h2 id="settings-formulaire-title">Formulaire</h2>
         <p>Options de visibilité disponibles dans le formulaire d'ajout de TFE.</p>
-        <p><small>L'option <strong>Libre</strong> ne sera activée qu'à partir de l'année académique prochaine.</small></p>
+        <p class="param-note">L'option <strong>Libre</strong> ne sera activée qu'à partir de l'année académique prochaine.</p>
 
-        <form method="post" action="actions/settings.php" class="admin-form">
+        <form method="post" action="actions/settings.php" class="param-form">
             <input type="hidden" name="csrf_token" value="<?= htmlspecialchars($_SESSION['csrf_token']) ?>">
             <input type="hidden" name="section" value="formulaire">
 
-            <div class="admin-settings-toggles">
-                <label class="admin-toggle-row">
-                    <span class="admin-toggle-label">
-                        <strong>Interdit</strong>
+            <fieldset>
+                <legend>Types d'accès</legend>
+
+                <label class="param-checkbox">
+                    <input type="checkbox" name="access_type_interdit_enabled" value="1"
+                           <?= ($siteSettings['access_type_interdit_enabled'] ?? '1') === '1' ? 'checked' : '' ?>>
+                    <span>
+                        <strong>Interdit</strong><br>
                         <small>TFE non disponible en physique ni sur le site</small>
                     </span>
-                    <input type="checkbox" name="access_type_interdit_enabled" value="1"
-                           class="admin-toggle"
-                           <?= ($siteSettings['access_type_interdit_enabled'] ?? '1') === '1' ? 'checked' : '' ?>>
                 </label>
 
-                <label class="admin-toggle-row">
-                    <span class="admin-toggle-label">
-                        <strong>Interne</strong>
+                <label class="param-checkbox">
+                    <input type="checkbox" name="access_type_interne_enabled" value="1"
+                           <?= ($siteSettings['access_type_interne_enabled'] ?? '1') === '1' ? 'checked' : '' ?>>
+                    <span>
+                        <strong>Interne</strong><br>
                         <small>TFE accessible uniquement sur place en physique</small>
                     </span>
-                    <input type="checkbox" name="access_type_interne_enabled" value="1"
-                           class="admin-toggle"
-                           <?= ($siteSettings['access_type_interne_enabled'] ?? '1') === '1' ? 'checked' : '' ?>>
                 </label>
 
-                <label class="admin-toggle-row admin-toggle-row--disabled">
-                    <span class="admin-toggle-label">
-                        <strong>Libre</strong>
+                <label class="param-checkbox param-checkbox--disabled">
+                    <input type="checkbox" name="access_type_libre_enabled" value="1"
+                           <?= ($siteSettings['access_type_libre_enabled'] ?? '0') === '1' ? 'checked' : '' ?>>
+                    <span>
+                        <strong>Libre</strong><br>
                         <small>Libre accès — disponible à partir de l'année académique prochaine</small>
                     </span>
-                    <input type="checkbox" name="access_type_libre_enabled" value="1"
-                           class="admin-toggle"
-                           <?= ($siteSettings['access_type_libre_enabled'] ?? '0') === '1' ? 'checked' : '' ?>>
                 </label>
-            </div>
+            </fieldset>
 
-            <div class="admin-form-footer">
-                <button type="submit" class="admin-btn">Enregistrer</button>
-            </div>
+            <button type="submit">Enregistrer</button>
         </form>
     </section>
 
     <!-- ══════════════════════════════════════════════════════════════
-         SECTION 3 — Compte administrateur
+         COMPTE ADMINISTRATEUR
     ══════════════════════════════════════════════════════════════ -->
-    <section class="admin-settings-section" aria-labelledby="settings-account-title">
-        <h2 class="admin-settings-section__title" id="settings-account-title">Compte administrateur</h2>
+    <section aria-labelledby="settings-account-title">
+        <h2 id="settings-account-title">Compte administrateur</h2>
 
-        <!-- Status info -->
-        <dl class="admin-account-status">
-            <div class="admin-account-status__row">
-                <dt class="admin-account-status__label">Authentification PHP</dt>
+        <dl class="param-account-status">
+            <div>
+                <dt>Authentification PHP</dt>
                 <dd><?php $badgeType = 'ok'; $badgeValue = $hasPassword; $badgeOkLabel = 'Active'; $badgeWarnLabel = 'Non configurée'; include APP_ROOT . '/templates/partials/status-badge.php'; ?></dd>
             </div>
-            <div class="admin-account-status__row">
-                <dt class="admin-account-status__label">Fichier de configuration</dt>
+            <div>
+                <dt>Fichier de configuration</dt>
                 <dd>
-                    <code class="admin-account-status__code">config/admin_credentials.php</code>
+                    <code>config/admin_credentials.php</code>
                     <?php $badgeType = 'ok'; $badgeValue = file_exists($credentialsFile); $badgeOkLabel = 'Présent'; $badgeWarnLabel = 'Absent'; include APP_ROOT . '/templates/partials/status-badge.php'; ?>
                 </dd>
             </div>
-            <?php if (!$hasPassword): ?>
-            <p class="admin-account-status__note">
-                Aucun mot de passe PHP configuré. Le formulaire ci-dessous créera
-                <code>config/admin_credentials.php</code> avec un hash bcrypt.
-            </p>
-            <?php endif; ?>
         </dl>
 
-        <!-- Password change form -->
-        <h3 class="admin-section-title"><?= $hasPassword ? 'Changer le mot de passe' : 'Définir le mot de passe' ?></h3>
+        <?php if (!$hasPassword): ?>
+        <p class="param-note">
+            Aucun mot de passe PHP configuré. Le formulaire ci-dessous créera
+            <code>config/admin_credentials.php</code> avec un hash bcrypt.
+        </p>
+        <?php endif; ?>
 
-        <form method="post" action="/admin/actions/account.php" class="admin-form" autocomplete="off">
+        <form method="post" action="/admin/actions/account.php" class="param-form" autocomplete="off">
             <input type="hidden" name="csrf_token" value="<?= htmlspecialchars($_SESSION['csrf_token']) ?>">
             <input type="hidden" name="redirect" value="/admin/parametres.php">
 
             <?php if ($hasPassword): ?>
             <div>
                 <label for="current_password">Mot de passe actuel</label>
-                <div>
-                    <input type="password" id="current_password"
-                           name="current_password" required autocomplete="current-password">
-                </div>
+                <input type="password" id="current_password"
+                       name="current_password" required autocomplete="current-password">
             </div>
             <?php endif; ?>
 
             <div>
                 <label for="new_password">Nouveau mot de passe</label>
-                <div>
-                    <input type="password" id="new_password"
-                           name="new_password" required autocomplete="new-password"
-                           minlength="12">
-                    <small>Minimum 12 caractères.</small>
-                </div>
+                <input type="password" id="new_password"
+                       name="new_password" required autocomplete="new-password"
+                       minlength="12">
+                <small>Minimum 12 caractères.</small>
             </div>
 
             <div>
                 <label for="confirm_password">Confirmer le mot de passe</label>
-                <div>
-                    <input type="password" id="confirm_password"
-                           name="confirm_password" required autocomplete="new-password">
-                </div>
+                <input type="password" id="confirm_password"
+                       name="confirm_password" required autocomplete="new-password">
             </div>
 
-            <div class="admin-form-footer">
-                <button type="submit" class="admin-btn">
-                    <?= $hasPassword ? 'Mettre à jour le mot de passe' : 'Définir le mot de passe' ?>
-                </button>
-            </div>
+            <button type="submit">
+                <?= $hasPassword ? 'Mettre à jour le mot de passe' : 'Définir le mot de passe' ?>
+            </button>
         </form>
 
+        <!-- Danger zone: remove credentials -->
         <?php if ($hasPassword): ?>
-        <!-- Danger zone: remove password -->
-        <h3 class="admin-section-title admin-section-title--danger">Zone de danger</h3>
-        <div class="admin-danger-zone">
-            <p class="admin-danger-zone__description">
-                <strong>Supprimer la configuration du mot de passe PHP</strong><br>
-                <small>
-                    Supprime <code>config/admin_credentials.php</code>. L'accès admin
-                    dépendra uniquement de l'authentification nginx Basic Auth si elle est configurée.
-                </small>
+        <fieldset class="param-danger-zone">
+            <legend>Supprimer la configuration du mot de passe PHP</legend>
+            <p>
+                Supprime <code>config/admin_credentials.php</code>. L'accès admin
+                dépendra uniquement de l'authentification nginx Basic Auth si elle est configurée.
             </p>
             <form method="post" action="/admin/actions/account.php"
                   onsubmit="return confirm('Supprimer le fichier de mot de passe PHP ? L\'accès admin ne sera protégé que par nginx Basic Auth.')">
                 <input type="hidden" name="csrf_token" value="<?= htmlspecialchars($_SESSION['csrf_token']) ?>">
                 <input type="hidden" name="action" value="remove_credentials">
                 <input type="hidden" name="redirect" value="/admin/parametres.php">
-                <input type="hidden" name="current_password_remove" id="current_password_remove" value="">
-                <button type="submit" class="admin-btn admin-btn--danger">Supprimer le fichier</button>
+                <input type="hidden" name="current_password_remove" value="">
+                <button type="submit" class="param-btn-danger">Supprimer le fichier</button>
             </form>
-        </div>
+        </fieldset>
         <?php endif; ?>
     </section>
 </main>
diff --git a/public/assets/css/admin.css b/public/assets/css/admin.css
index df19404..296e4d6 100644
--- a/public/assets/css/admin.css
+++ b/public/assets/css/admin.css
@@ -650,37 +650,56 @@
 }
 
 /* ── Thesis info sections (thanks page) ─────────────────────────────────── */
-.admin-body main > section {
+.admin-body main > section:not([aria-labelledby^="settings-"]) {
     border: 1px solid var(--border-primary);
     border-radius: 6px;
     padding: var(--space-m);
     margin-bottom: var(--space-m);
 }
 
-.admin-body main > section h2 {
+.admin-body main > section:not([aria-labelledby^="settings-"]) h2 {
     margin: 0 0 var(--space-s);
     font-size: var(--step-1);
     border-bottom: 1px solid var(--border-primary);
     padding-bottom: var(--space-2xs);
 }
 
-.admin-body main > section dl {
+.admin-body main > section:not([aria-labelledby^="settings-"]) dl {
     display: grid;
     grid-template-columns: 180px 1fr;
     gap: var(--space-3xs) var(--space-s);
 }
 
-.admin-body main > section dt {
+.admin-body main > section:not([aria-labelledby^="settings-"]) dt {
     font-weight: 600;
     font-size: var(--step--1);
     color: var(--text-secondary);
 }
 
-.admin-body main > section dd {
+.admin-body main > section:not([aria-labelledby^="settings-"]) dd {
     margin: 0;
     font-size: var(--step--1);
 }
 
+/* ── Paramètres page top-level sections (flat, no border card) ──────────── */
+.admin-body main > section[aria-labelledby^="settings-"] {
+    border: none;
+    border-radius: 0;
+    padding: 0;
+    margin-bottom: var(--space-xl);
+}
+
+.admin-body main > section[aria-labelledby^="settings-"] > h2 {
+    font-size: var(--step-1);
+    font-weight: 600;
+    letter-spacing: 0.06em;
+    text-transform: uppercase;
+    color: var(--text-secondary);
+    margin: 0 0 var(--space-m);
+    padding-bottom: var(--space-2xs);
+    border-bottom: 1px solid var(--border-primary);
+}
+
 .admin-action-bar {
     margin-top: var(--space-m);
     display: flex;
@@ -809,26 +828,69 @@
     width: 100%;
 }
 
-/* ── Import page ────────────────────────────────────────────────────────── */
-.admin-import-area {
-    display: flex;
-    flex-direction: column;
-    gap: var(--space-m);
+/* ════ Import status card (dialog) ═══════════════════════════════════════ */
+.admin-import-status-card {
+    margin: 0;
+    padding: var(--space-m) var(--space-l);
 }
 
-/* Error list inside role="alert" (import page) */
-.admin-error-list {
+.admin-import-status-card__success {
+    background: var(--success-muted-bg);
+    border: 1px solid var(--success);
+    border-left: 3px solid var(--success);
+    border-radius: 4px;
+    padding: var(--space-xs) var(--space-s);
+    font-size: var(--step--1);
+    margin: 0;
+}
+
+.admin-import-status-card__errors {
+    background: var(--accent-muted);
+    border: 1px solid var(--error);
+    border-left: 3px solid var(--error);
+    border-radius: 4px;
+    padding: var(--space-xs) var(--space-s);
+    font-size: var(--step--1);
+    margin-bottom: var(--space-s);
+}
+
+.admin-import-status-card__errors .admin-error-list {
     margin: var(--space-2xs) 0 0;
     padding-left: var(--space-s);
 }
 
-/* Hint text under the file input (import page) */
+/* Import log details/summary */
+.admin-import-log-details {
+    margin: 0;
+    padding: 0 var(--space-l) var(--space-m);
+}
+
+.admin-import-log-details summary {
+    cursor: pointer;
+    font-size: var(--step--1);
+    font-weight: 600;
+    color: var(--text-secondary);
+    padding: var(--space-2xs) 0;
+    border-top: 1px solid var(--border-primary);
+}
+
+.admin-import-log-details summary:hover {
+    color: var(--text-primary);
+}
+
+/* Hint text under the file input */
 .admin-file-hint {
     display: block;
     margin-top: var(--space-2xs);
 }
 
-/* Import results panel */
+/* Error list inside role="alert" */
+.admin-error-list {
+    margin: var(--space-2xs) 0 0;
+    padding-left: var(--space-s);
+}
+
+/* Import results panel (legacy, kept for backward compat) */
 .admin-import-results {
     margin-top: var(--space-l);
 }
@@ -1080,7 +1142,237 @@
 .admin-import-log__item--skip::before  { content: '⚠'; color: var(--warning); }
 .admin-import-log__item--error::before { content: '✗'; color: var(--error); }
 
-/* ── Settings page sections ─────────────────────────────────────────────── */
+/* ── Paramètres page (flat, semantic) ──────────────────────────────────── */
+.param-maintenance-row {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    gap: var(--space-s);
+    padding: var(--space-xs) var(--space-m);
+    margin-bottom: var(--space-m);
+    font-size: var(--step--1);
+    border: 1px solid var(--border-primary);
+    border-radius: 4px;
+    background: var(--bg-secondary);
+}
+
+.param-maintenance-row:has( .param-btn-warning ) {
+    background: var(--warning-muted-bg);
+    border-color: var(--warning);
+}
+
+.param-maintenance-row p {
+    margin: 0;
+}
+
+.param-maintenance-row form {
+    flex-shrink: 0;
+}
+
+.param-form {
+    display: flex;
+    flex-direction: column;
+    gap: var(--space-m);
+}
+
+.param-form fieldset {
+    border: 1px solid var(--border-primary);
+    border-radius: 4px;
+    padding: var(--space-m);
+    background: var(--bg-secondary);
+    display: flex;
+    flex-direction: column;
+    gap: var(--space-xs);
+}
+
+.param-form legend {
+    font-weight: 600;
+    font-size: var(--step--1);
+    color: var(--text-secondary);
+    padding: 0 var(--space-xs);
+}
+
+.param-checkbox {
+    display: flex;
+    align-items: flex-start;
+    gap: var(--space-xs);
+    font-size: var(--step--1);
+    cursor: pointer;
+}
+
+.param-checkbox--disabled {
+    opacity: 0.6;
+    cursor: not-allowed;
+}
+
+.param-checkbox input[type="checkbox"] {
+    accent-color: var(--accent-primary);
+    width: 16px;
+    height: 16px;
+    cursor: pointer;
+    flex-shrink: 0;
+    margin-top: 2px;
+}
+
+.param-checkbox--disabled input[type="checkbox"] {
+    cursor: not-allowed;
+}
+
+.param-checkbox small {
+    color: var(--text-secondary);
+    font-size: var(--step--2);
+}
+
+.param-note {
+    font-size: var(--step--1);
+    color: var(--text-secondary);
+    margin: 0;
+}
+
+.param-account-status {
+    display: flex;
+    flex-direction: column;
+    gap: var(--space-xs);
+    font-size: var(--step--1);
+    margin-bottom: var(--space-m);
+}
+
+.param-account-status > div {
+    display: flex;
+    align-items: center;
+    gap: var(--space-xs);
+}
+
+.param-account-status dt {
+    color: var(--text-secondary);
+    min-width: 200px;
+}
+
+.param-account-status dd {
+    margin: 0;
+    display: flex;
+    align-items: center;
+    gap: var(--space-xs);
+}
+
+.param-account-status code {
+    font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
+    font-size: var(--step--2);
+    border: 1px solid var(--border-primary);
+    border-radius: 3px;
+    padding: var(--space-3xs);
+    color: var(--text-secondary);
+    background: var(--bg-secondary);
+}
+
+.param-form > div {
+    display: grid;
+    grid-template-columns: 1fr;
+    gap: var(--space-3xs);
+    border-top: 1px solid var(--border-primary);
+    padding: var(--space-xs) 0;
+}
+
+.param-form > div:first-of-type {
+    border-top: none;
+    padding-top: 0;
+}
+
+.param-form input[type="password"] {
+    width: 100%;
+    max-width: 380px;
+    background: transparent;
+    border: none;
+    border-bottom: 1px solid var(--border-primary);
+    font-size: var(--step--1);
+    font-family: inherit;
+    padding: var(--space-3xs) 0;
+    border-radius: 0;
+    transition: border-color 0.15s;
+}
+
+.param-form input[type="password"]:focus {
+    outline: none;
+    border-bottom-color: var(--accent-primary);
+}
+
+.param-form > button {
+    align-self: flex-start;
+    padding: var(--space-2xs) var(--space-l);
+    background: var(--accent-primary);
+    color: var(--accent-foreground);
+    border: none;
+    border-radius: 3px;
+    font-size: var(--step--1);
+    font-family: inherit;
+    cursor: pointer;
+    letter-spacing: 0.04em;
+    transition: background 0.15s;
+}
+
+.param-form > button:hover {
+    background: var(--accent-secondary);
+}
+
+.param-btn-warning {
+    padding: var(--space-3xs) var(--space-s);
+    background: var(--accent-yellow);
+    color: var(--text-primary);
+    border: none;
+    border-radius: 3px;
+    font-size: var(--step--1);
+    font-family: inherit;
+    cursor: pointer;
+    transition: filter 0.15s;
+}
+
+.param-btn-warning:hover {
+    filter: brightness(0.9);
+}
+
+.param-btn-danger {
+    padding: var(--space-3xs) var(--space-s);
+    background: var(--accent-red);
+    color: var(--accent-foreground);
+    border: none;
+    border-radius: 3px;
+    font-size: var(--step--1);
+    font-family: inherit;
+    cursor: pointer;
+    transition: filter 0.15s;
+}
+
+.param-btn-danger:hover {
+    filter: brightness(0.9);
+}
+
+.param-danger-zone {
+    border: 1px solid var(--danger-border-muted);
+    border-radius: 4px;
+    padding: var(--space-m);
+    margin-bottom: var(--space-m);
+    background: var(--bg-secondary);
+}
+
+.param-danger-zone legend {
+    width: auto;
+    font-weight: 600;
+    color: var(--error);
+    font-size: var(--step-0);
+    padding: 0 var(--space-xs);
+}
+
+.param-danger-zone p {
+    font-size: var(--step--1);
+    color: var(--text-secondary);
+    margin-bottom: var(--space-xs);
+}
+
+.param-danger-zone form {
+    margin-top: var(--space-xs);
+}
+
+/* ── Settings page sections — legacy aliases (kept for any remaining use) ─ */
 .admin-settings-section {
     border: 1px solid var(--border-primary);
     border-radius: 6px;
@@ -1125,6 +1417,130 @@
     flex-shrink: 0;
 }
 
+.admin-account-status {
+    border: 1px solid var(--border-primary);
+    border-radius: 4px;
+    padding: var(--space-s) var(--space-m);
+    margin-bottom: var(--space-l);
+    display: flex;
+    flex-direction: column;
+    gap: var(--space-xs);
+}
+
+.admin-account-status__row {
+    display: flex;
+    align-items: center;
+    gap: var(--space-xs);
+    font-size: var(--step--1);
+}
+
+.admin-account-status__label {
+    color: var(--text-secondary);
+    min-width: 220px;
+}
+
+.admin-account-status__code {
+    font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
+    font-size: var(--step--2);
+    border: 1px solid var(--border-primary);
+    border-radius: 3px;
+    padding: var(--space-3xs) var(--space-3xs);
+    color: var(--text-secondary);
+    background: var(--bg-secondary);
+}
+
+.admin-account-status__note {
+    font-size: var(--step--1);
+    color: var(--text-secondary);
+    margin: 0;
+}
+
+.admin-danger-zone {
+    border: 1px solid var(--danger-border-muted);
+    border-radius: 4px;
+    padding: var(--space-m) var(--space-m);
+    display: flex;
+    align-items: center;
+    gap: var(--space-m);
+    flex-wrap: wrap;
+}
+
+.admin-danger-zone__description {
+    flex: 1;
+    font-size: var(--step--1);
+}
+
+.admin-settings-toggles {
+    display: flex;
+    flex-direction: column;
+    gap: var(--space-xs);
+    margin-bottom: var(--space-m);
+}
+
+.admin-toggle-row {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    gap: var(--space-m);
+    background: var(--bg-secondary);
+    border: 1px solid var(--border-primary);
+    border-radius: 4px;
+    padding: var(--space-xs) var(--space-m);
+    cursor: pointer;
+}
+
+.admin-toggle-row--disabled {
+    opacity: 0.6;
+}
+
+.admin-toggle-label {
+    display: flex;
+    flex-direction: column;
+    gap: 2px;
+}
+
+.admin-toggle-label strong {
+    font-size: var(--step-0);
+}
+
+.admin-toggle-label small {
+    color: var(--text-secondary);
+    font-size: var(--step--2);
+}
+
+.admin-toggle {
+    appearance: none;
+    -webkit-appearance: none;
+    width: 40px;
+    height: 22px;
+    background: var(--border-primary);
+    border-radius: 11px;
+    position: relative;
+    cursor: pointer;
+    flex-shrink: 0;
+    transition: background 0.2s;
+}
+
+.admin-toggle::after {
+    content: '';
+    position: absolute;
+    top: 3px;
+    left: 3px;
+    width: 16px;
+    height: 16px;
+    border-radius: 50%;
+    background: #fff;
+    transition: transform 0.2s;
+}
+
+.admin-toggle:checked {
+    background: var(--accent-primary);
+}
+
+.admin-toggle:checked::after {
+    transform: translateX(18px);
+}
+
 /* ── Cancel link ────────────────────────────────────────────────────────── */
 .admin-cancel-link {
     font-size: var(--step--1);
diff --git a/src/Database.php b/src/Database.php
index f9da3e3..a9eebd8 100644
--- a/src/Database.php
+++ b/src/Database.php
@@ -1659,6 +1659,17 @@ class Database {
         return (string)$row['identifier'];
     }
 
+    /**
+     * Delete every thesis in the database.
+     */
+    public function deleteAllTheses(): int {
+        $ids = $this->pdo->query("SELECT id FROM theses")->fetchAll(\PDO::FETCH_COLUMN);
+        if (empty($ids)) return 0;
+        $count = count($ids);
+        $this->bulkDeleteTheses($ids);
+        return $count;
+    }
+
     /**
      * Insert a thesis file record
      */