/* 平板设备 */
@media (max-width: 768px) {
    .product-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .about-content {
        flex-direction: column;
    }

    /* 导航栏响应式 */
    .hamburger {
        display: flex;
    }

    .nav-links {
        display: none;
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        height: auto;
        background: white;
        flex-direction: column;
        padding: 20px 0;
        box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        z-index: 99;
    }

    .nav-links.active {
        display: flex;
    }

    .nav-links li {
        margin: 10px 0;
        text-align: center;
    }

    .nav-links li a {
        padding: 10px 20px;
        display: block;
    }
}

/* 手机设备 */
@media (max-width: 480px) {
    .product-grid {
        grid-template-columns: 1fr;
    }

    .slider {
        height: 300px;
    }

    .slide img {
        height: 300px;
    }

    /* 导航栏在手机端的额外样式 */
    .nav-links {
        top: 60px;
    }

    .navbar .container {
        height: 60px;
    }

    .logo {
        font-size: 1.2em;
    }
}