body {
    background-color: #f8f9fa;
    font-size: 1.1rem;
}
.container-mobile {
    width: 100%;
    padding: 1.5rem;
}
.card {
    margin-top: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}
.card-body {
    padding: 2rem;
}
.form-label {
    font-weight: 500;
}
.form-control, .btn {
    width: 100%;
    margin-top: 0.5rem;
    height: 3rem;
    font-size: 1.2rem;
}
.btn {
    font-weight: 600;
}
.alert {
    font-size: 1rem;
}