/* 响应式样式 */

/* 大型设备 (大型笔记本和台式机, 1200px 及以上) */
@media (min-width: 1200px) {
    .container {
        max-width: 1140px;
    }
}

/* 中型设备 (笔记本电脑, 992px 及以上) */
@media (max-width: 1199px) {
    .container {
        max-width: 960px;
    }
    
    .hero-content h2 {
        font-size: 2.5rem;
    }
}

/* 小型设备 (平板电脑, 768px 及以上) */
@media (max-width: 991px) {
    .container {
        max-width: 720px;
    }
    
    .about-content {
        flex-direction: column;
    }
    
    .about-text, .about-image {
        width: 100%;
    }
    
    .contact-content {
        flex-direction: column;
    }
    
    .contact-info, .contact-form {
        width: 100%;
    }
    
    .hero-content h2 {
        font-size: 2.2rem;
    }
}

/* 超小设备 (手机, 767px 以下) */
@media (max-width: 767px) {
    .container {
        max-width: 540px;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .main-menu {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: white;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        transform: translateY(-10px);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }
    
    .main-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .main-menu li {
        margin: 10px 0;
    }
    
    .hero-content h2 {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .product-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
    
    .advantage-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}

/* 极小设备 (小型手机, 575px 以下) */
@media (max-width: 575px) {
    .hero-content h2 {
        font-size: 1.8rem;
    }
    
    .btn {
        padding: 10px 20px;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .product-categories {
        flex-direction: column;
        align-items: center;
    }
    
    .category-btn {
        margin-bottom: 10px;
        width: 80%;
    }
}