/* 平板设备响应式 */
@media screen and (max-width: 992px) {
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
}

/* 移动设备响应式 */
@media screen and (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 10px rgba(0, 0, 0, 0.1);
        padding: 1rem 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .hero-content p {
        font-size: 1rem;
    }
    
    .page-title {
        font-size: 2rem;
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
    }
}