@media (max-width: 600px) {
    .card,
    .home-card,
    .praise-card,
    .sign-card,
    .settings-card,
    .admin-container {
        padding-left: 16px;
        padding-right: 16px;
    }
    .sign-row-with-button {
        flex-wrap: wrap;
    }
    .sign-row-with-button img {
        min-width: 80px;
        height: 36px;
    }
    .chat-container {
        flex-direction: column;
    }
    .chat-sidebar {
        width: 100%;
        max-height: 150px;
    }
    .flip-card {
        height: 400px;
    }
    .stat-number {
        font-size: 28px;
    }
    .sign-btn-large {
        width: 90%;
        font-size: 16px;
    }

    /* ===== 商城响应式（新增） ===== */
    .product-name {
        font-size: 0.9rem;
    }
    .product-desc {
        font-size: 0.7rem;
        -webkit-line-clamp: 1;
    }
    .product-price-stock {
        font-size: 0.75rem;
    }
    .product-image {
        width: 70px;
        height: 70px;
    }
    .detail-buttons {
        flex-direction: column;
        gap: 8px;
    }
    .detail-cart-btn,
    .detail-buy-btn {
        padding: 10px;
        font-size: 0.9rem;
    }
    .detail-right h2 {
        font-size: 1.2rem;
    }
    .detail-desc {
        font-size: 0.8rem;
    }
    .detail-price-stock {
        font-size: 0.9rem;
    }
}