body {
    background-color: #f7f8fa;
}
.card {
    border: none;
    box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}
.navbar-brand {
    font-weight: 600;
}
/* Asegura aspecto Bootstrap en formularios cuyos widgets no llevan
   la clase form-control explícita (p.ej. AuthenticationForm de Django) */
form input[type="text"]:not(.form-check-input),
form input[type="password"]:not(.form-check-input),
form input[type="email"]:not(.form-check-input),
form input[type="tel"]:not(.form-check-input) {
    display: block;
    width: 100%;
    padding: 0.375rem 0.75rem;
    border: 1px solid #ced4da;
    border-radius: 0.375rem;
    margin-bottom: 0.25rem;
}