body {
  background: #f5f7fb;
}

.auth-card {
  max-width: 420px;
  margin: 60px auto;
  padding: 30px;
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 10px 30px rgba(0,0,0,.05);
}

.auth-card h3 {
  color: #2563eb;
  font-weight: 700;
}

.form-control,
.form-select {
  border-radius: 8px;
}

.btn-primary {
  width: 100%;
  border-radius: 8px;
}

/* Améliorations UX */
.auth-card a {
  text-decoration: none;
  color: #2563eb;
  font-weight: 500;
}

.auth-card a:hover {
  text-decoration: underline;
}

.alert {
  border-radius: 8px;
  font-size: 0.95rem;
}

@media (max-width: 576px) {
  .auth-card {
    margin: 30px 15px;
    padding: 25px;
  }
}