.text-center {
    text-align: center;
}

.mt-16 {
    margin-top: 16px;
}

.mb-16 {
    margin-bottom: 16px;
}

.hidden {
    display: none;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .top-app-bar__title span {
        display: none;
    }

    .card-grid {
        grid-template-columns: 1fr;
    }

    .input-row {
        flex-direction: column;
    }
}

@media (max-width: 600px) {
    .step-content {
        padding-left: 0;
    }
}