diff --git a/backend/src/server.js b/backend/src/server.js
index 2c1c459..64f4a64 100644
--- a/backend/src/server.js
+++ b/backend/src/server.js
@@ -71,9 +71,12 @@ const iconsDir2 = path.join(_dataDir, 'icons');
 app.use('/api/icons-files', express.static(iconsDir2, { maxAge: '1h', fallthrough: false }));
 
 // Basic rate-limit on auth endpoints
+// Seuil relevé (50 → 300) : usage local mono-utilisateur/multi-investisseur avec
+// beaucoup d'allers-retours de test (login, 2FA, création de comptes admin/invitation…),
+// l'ancien seuil de 50 req/15min était atteint trop facilement en usage normal.
 const authLimiter = rateLimit({
   windowMs: 15 * 60 * 1000,
-  max: 50,
+  max: 300,
   standardHeaders: true,
   legacyHeaders: false,
 });
diff --git a/frontend/src/pages/MonCompte.jsx b/frontend/src/pages/MonCompte.jsx
index dd704fd..62af227 100644
--- a/frontend/src/pages/MonCompte.jsx
+++ b/frontend/src/pages/MonCompte.jsx
@@ -43,7 +43,7 @@ function ProfileSelect({ label, options, value, onChange }) {
 
   return (
     <div ref={ref} className="profile-field">
-      <span className="profile-label">{label}</span>
+      <label>{label}</label>
       <div className={`profile-select-trigger${open ? ' open' : ''}`}
         onClick={() => setOpen(o => !o)} role="button" tabIndex={0}
         onKeyDown={e => e.key === 'Enter' && setOpen(o => !o)}>
@@ -132,25 +132,31 @@ function EmailChangeForm({ onDone }) {
   };
 
   return (
-    <form onSubmit={submit} style={{ marginTop: 16, display: 'flex', flexDirection: 'column', gap: 12 }}>
+    <form onSubmit={submit} style={{
+      marginTop: 16, paddingTop: 16, borderTop: '1px solid var(--border)',
+      display: 'flex', flexDirection: 'column', gap: 12, maxWidth: 400,
+    }}>
       <p style={{ margin: 0, fontSize: 13, color: 'var(--text-muted)' }}>
         Après le changement, un email de vérification sera envoyé à la nouvelle adresse.
       </p>
       {err && <div className="error">{err}</div>}
       {msg && <div className="success-msg">{msg}</div>}
-      <div style={{ display: 'flex', flexDirection: 'column', gap: 4 }}>
-        <label className="profile-label">Nouvelle adresse email</label>
-        <input className="profile-input" type="email" required value={newEmail} onChange={e => setNewEmail(e.target.value)} placeholder="nouvelle@email.com" />
+      <div>
+        <label>Nouvelle adresse email</label>
+        <input type="email" required value={newEmail} onChange={e => setNewEmail(e.target.value)} placeholder="nouvelle@email.com" />
       </div>
-      <div style={{ display: 'flex', flexDirection: 'column', gap: 4 }}>
-        <label className="profile-label">Mot de passe actuel (confirmation)</label>
-        <PasswordInput className="profile-input" required value={pwd} onChange={e => setPwd(e.target.value)} placeholder="••••••••" />
+      <div>
+        <label>Mot de passe actuel (confirmation)</label>
+        <PasswordInput required value={pwd} onChange={e => setPwd(e.target.value)} placeholder="••••••••" />
       </div>
-      <div style={{ display: 'flex', gap: 8 }}>
-        <button type="submit" className="btn btn-primary" disabled={busy} style={{ fontSize: 13 }}>
+      <div style={{ display: 'flex', flexDirection: 'column', alignItems: 'flex-end', gap: 12 }}>
+        <button type="submit" className="primary" disabled={busy}>
           {busy ? 'Enregistrement…' : 'Confirmer le changement'}
         </button>
-        <button type="button" className="btn btn-outline" onClick={() => onDone()} style={{ fontSize: 13 }}>Annuler</button>
+        <button type="button" onClick={() => onDone()}
+          style={{ background: 'none', border: 'none', color: 'var(--text-muted)', fontSize: 13, cursor: 'pointer', textDecoration: 'underline', padding: 0 }}>
+          Annuler
+        </button>
       </div>
     </form>
   );
@@ -191,64 +197,73 @@ function AccountForm() {
   const handleBlur = () => save();
 
   return (
-    <div className="profile-page">
-
+    <>
       {/* ── Mon profil ──────────────────────────────────────── */}
-      <section className="profile-section">
-        <h2 className="profile-section-title">Mon profil</h2>
+      <div className="card">
+        <h3 style={{ margin: '0 0 4px' }}>Mon profil</h3>
+        <p className="text-muted" style={{ margin: '0 0 16px', fontSize: 'var(--fs-sm)' }}>
+          Vos informations personnelles et votre adresse email de connexion.
+        </p>
 
         {infoErr && <div className="error" style={{ marginBottom: 12 }}>{infoErr}</div>}
         {infoMsg && <div className="success-msg" style={{ marginBottom: 12 }}>{infoMsg}</div>}
 
-        <div className="profile-grid-2">
-          <div className="profile-field">
-            <span className="profile-label">Prénom</span>
-            <input className="profile-input" value={prenom}
-              onChange={e => setPrenom(e.target.value)}
-              onBlur={handleBlur}
-              placeholder="Prénom" />
+        <div style={{ display: 'flex', flexDirection: 'column', gap: 12, maxWidth: 400 }}>
+          <div style={{ display: 'grid', gridTemplateColumns: '1fr 1fr', gap: 12 }}>
+            <div>
+              <label>Prénom</label>
+              <input value={prenom}
+                onChange={e => setPrenom(e.target.value)}
+                onBlur={handleBlur}
+                placeholder="Prénom" />
+            </div>
+            <div>
+              <label>Nom</label>
+              <input value={nom}
+                onChange={e => setNom(e.target.value)}
+                onBlur={handleBlur}
+                placeholder="NOM" />
+            </div>
           </div>
-          <div className="profile-field">
-            <span className="profile-label">Nom</span>
-            <input className="profile-input" value={nom}
-              onChange={e => setNom(e.target.value)}
-              onBlur={handleBlur}
-              placeholder="NOM" />
+
+          <div>
+            <label>Mon email</label>
+            <div style={{ display: 'flex', alignItems: 'center', gap: 10, flexWrap: 'wrap' }}>
+              <span style={{ fontSize: 'var(--fs-base)', color: 'var(--text)' }}>{user?.email}</span>
+              {user?.email_verified
+                ? <span style={{ fontSize: 11, fontWeight: 600, padding: '2px 8px', borderRadius: 10, background: 'var(--success-bg, #f0fdf4)', color: 'var(--success, #16a34a)', border: '1px solid #bbf7d0' }}>✓ Vérifié</span>
+                : <span style={{ fontSize: 11, fontWeight: 600, padding: '2px 8px', borderRadius: 10, background: 'var(--warning-bg, #fffbeb)', color: 'var(--warning-text, #92400e)', border: '1px solid #fcd34d' }}>Non vérifié</span>
+              }
+            </div>
+            {!user?.email_verified && <EmailResendBlock email={user?.email} />}
           </div>
         </div>
 
-        <div className="profile-field profile-field-full">
-          <span className="profile-label">Mon email</span>
-          <div className="profile-email-row" style={{ display: 'flex', alignItems: 'center', gap: 10, flexWrap: 'wrap' }}>
-            <span className="profile-email-value">{user?.email}</span>
-            {user?.email_verified
-              ? <span style={{ fontSize: 11, fontWeight: 600, padding: '2px 8px', borderRadius: 10, background: 'var(--success-bg, #f0fdf4)', color: 'var(--success, #16a34a)', border: '1px solid #bbf7d0' }}>✓ Vérifié</span>
-              : <span style={{ fontSize: 11, fontWeight: 600, padding: '2px 8px', borderRadius: 10, background: 'var(--warning-bg, #fffbeb)', color: 'var(--warning-text, #92400e)', border: '1px solid #fcd34d' }}>Non vérifié</span>
-            }
+        {!changingEmail && (
+          <div style={{ display: 'flex', justifyContent: 'flex-end', marginTop: 16 }}>
+            <button className="primary" type="button" onClick={() => setChangingEmail(true)}>
+              Changer mon email
+            </button>
           </div>
-          {!user?.email_verified && <EmailResendBlock email={user?.email} />}
-        </div>
-
-        <div style={{ marginTop: 20 }}>
-          <button className="profile-manage-btn" type="button" onClick={() => setChangingEmail(v => !v)}>
-            {changingEmail ? 'Annuler' : 'Changer mon email'}
-          </button>
-        </div>
+        )}
 
         {changingEmail && <EmailChangeForm onDone={() => setChangingEmail(false)} />}
-      </section>
+
+        {loading && <p className="text-muted" style={{ fontSize: 'var(--fs-sm)', marginTop: 12 }}>Enregistrement…</p>}
+      </div>
 
       {/* ── Préférences ─────────────────────────────────────── */}
-      <section className="profile-section">
-        <h2 className="profile-section-title">Préférences</h2>
-        <div className="profile-grid-2">
+      <div className="card" style={{ marginTop: 20 }}>
+        <h3 style={{ margin: '0 0 4px' }}>Préférences</h3>
+        <p className="text-muted" style={{ margin: '0 0 16px', fontSize: 'var(--fs-sm)' }}>
+          Langue et devise utilisées dans l'application.
+        </p>
+        <div style={{ display: 'grid', gridTemplateColumns: '1fr 1fr', gap: 12, maxWidth: 400 }}>
           <ProfileSelect label="Langue"  options={LANGUES} value={langue}  onChange={setLangue} />
           <ProfileSelect label="Devise"  options={DEVISES} value={devise}  onChange={setDevise} />
         </div>
-      </section>
-
-      {loading && <p className="text-muted" style={{ fontSize: 'var(--fs-sm)' }}>Enregistrement…</p>}
-    </div>
+      </div>
+    </>
   );
 }
 
@@ -322,15 +337,19 @@ function TwoFASection({ user }) {
 
       {/* ── État normal ── */}
       {status === 'idle' && !enabled && (
-        <button className="primary" onClick={() => startSetup()} disabled={busy}>
-          {busy ? 'Chargement…' : 'Activer le 2FA'}
-        </button>
+        <div style={{ display: 'flex', justifyContent: 'flex-end' }}>
+          <button className="primary" onClick={() => startSetup()} disabled={busy}>
+            {busy ? 'Chargement…' : 'Activer le 2FA'}
+          </button>
+        </div>
       )}
       {status === 'idle' && enabled && (
-        <button className="btn btn-outline" style={{ color: 'var(--danger,#dc2626)', borderColor: 'var(--danger,#dc2626)' }}
-          onClick={() => { setStatus('disabling'); setErr(null); setMsg(null); }}>
-          Désactiver le 2FA
-        </button>
+        <div style={{ display: 'flex', justifyContent: 'flex-end' }}>
+          <button className="btn btn-outline" style={{ color: 'var(--danger,#dc2626)', borderColor: 'var(--danger,#dc2626)' }}
+            onClick={() => { setStatus('disabling'); setErr(null); setMsg(null); }}>
+            Désactiver le 2FA
+          </button>
+        </div>
       )}
 
       {/* ── Setup : QR code + vérification ── */}
@@ -374,10 +393,12 @@ function TwoFASection({ user }) {
               {busy ? '…' : 'Confirmer'}
             </button>
           </form>
-          <button type="button" onClick={() => { setStatus('idle'); setSetupData(null); setCode(''); setErr(null); }}
-            style={{ marginTop: 12, background: 'none', border: 'none', color: 'var(--text-muted)', fontSize: 13, cursor: 'pointer', textDecoration: 'underline', padding: 0 }}>
-            Annuler
-          </button>
+          <div style={{ display: 'flex', justifyContent: 'flex-end', maxWidth: 320, marginTop: 12 }}>
+            <button type="button" onClick={() => { setStatus('idle'); setSetupData(null); setCode(''); setErr(null); }}
+              style={{ background: 'none', border: 'none', color: 'var(--text-muted)', fontSize: 13, cursor: 'pointer', textDecoration: 'underline', padding: 0 }}>
+              Annuler
+            </button>
+          </div>
         </div>
       )}
 
@@ -399,10 +420,12 @@ function TwoFASection({ user }) {
               {busy ? '…' : 'Désactiver'}
             </button>
           </div>
-          <button type="button" onClick={() => { setStatus('idle'); setErr(null); setDisablePwd(''); }}
-            style={{ marginTop: 10, background: 'none', border: 'none', color: 'var(--text-muted)', fontSize: 13, cursor: 'pointer', textDecoration: 'underline', padding: 0 }}>
-            Annuler
-          </button>
+          <div style={{ display: 'flex', justifyContent: 'flex-end', marginTop: 10 }}>
+            <button type="button" onClick={() => { setStatus('idle'); setErr(null); setDisablePwd(''); }}
+              style={{ background: 'none', border: 'none', color: 'var(--text-muted)', fontSize: 13, cursor: 'pointer', textDecoration: 'underline', padding: 0 }}>
+              Annuler
+            </button>
+          </div>
         </form>
       )}
     </div>
@@ -438,26 +461,6 @@ function SecurityForm() {
     finally { setPwdLoading(false); }
   };
 
-  const handleBackfillComptes = async () => {
-    setLoadingBackfill(true);
-    setErrorMsg(null);
-    setSuccessMsg(null);
-    try {
-      const { updated, total } = await api.post('/remboursements/backfill-comptes', {});
-      if (updated === 0) {
-        setSuccessMsg(`Aucun remboursement à corriger (${total} vérifié${total > 1 ? 's' : ''}).`);
-      } else {
-        setSuccessMsg(`${updated} remboursement${updated > 1 ? 's' : ''} mis à jour sur ${total} vérifié${total > 1 ? 's' : ''}.`);
-      }
-      setShowBackfillModal(false);
-    } catch (err) {
-      setErrorMsg(err.message || 'Une erreur est survenue.');
-      setShowBackfillModal(false);
-    } finally {
-      setLoadingBackfill(false);
-    }
-  };
-
   return (
     <div className="card">
       <h3 style={{ margin: '0 0 4px' }}>Mot de passe</h3>
@@ -742,9 +745,11 @@ export default function MonCompte() {
         ))}
       </aside>
       {/* ── Contenu ─────────────────────────────────────── */}
-      <div className="account-content">
-        {section === 'profil'    && <AccountForm />}
-        {section === 'securite'  && <><SecurityForm /><TwoFASection user={user} /><TrustedDevicesSection /></>}
+      <div className="account-content account-content-center">
+        <div className="account-content-narrow">
+          {section === 'profil'    && <AccountForm />}
+          {section === 'securite'  && <><SecurityForm /><TwoFASection user={user} /><TrustedDevicesSection /></>}
+        </div>
       </div>
 
     </div>
diff --git a/frontend/src/styles.css b/frontend/src/styles.css
index 033e396..1cf0fdc 100644
--- a/frontend/src/styles.css
+++ b/frontend/src/styles.css
@@ -1338,6 +1338,17 @@ tr:hover td { background: var(--surface-2); }
   padding: 24px 0 32px 28px;
   min-width: 0;
 }
+/* Variante pour les pages "compte" à faible densité de contenu (MonCompte) :
+   évite que les cards s'étirent sur toute la largeur d'un grand écran.
+   Centrage via flex (plus fiable qu'un margin:auto sur un enfant de grid). */
+.account-content-center {
+  display: flex;
+  justify-content: center;
+}
+.account-content-narrow {
+  width: 100%;
+  max-width: 760px;
+}
 
 /* AccountForm interne — profil + préférences côte-à-côte */
 .profile-page {