/* 响应式设计 */
@media (max-width: 1200px) {
    .container {
        max-width: 1000px;
    }
}

@media (max-width: 992px) {
    .service-category,
    .about-content {
        flex-direction: column;
    }
    
    .service-category:nth-child(even) {
        flex-direction: column;
    }
    
    .service-text,
    .service-image,
    .about-text,
    .about-image {
        flex: none;
        width: 100%;
    }
    
    .service-image,
    .about-image {
        margin-top: 30px;
    }
    
    .portfolio-grid {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    }
}

@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        padding: 15px;
    }
    
    .logo {
        margin-bottom: 15px;
    }
    
    nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    nav ul li {
        margin: 0 10px 10px;
    }
    
    .hero {
        height: 70vh;
        min-height: 400px;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .feature-grid,
    .services-grid,
    .values-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .portfolio-grid {
        grid-template-columns: 1fr;
    }
    
    .page-header {
        height: 250px;
    }
    
    .page-header h1 {
        font-size: 2rem;
    }
    
    .page-header p {
        font-size: 1rem;
    }
}

@media (max-width: 576px) {
    .hero {
        height: 60vh;
        min-height: 300px;
    }
    
    .hero h1 {
        font-size: 1.8rem;
    }
    
    .btn {
        padding: 10px 20px;
    }
    
    .portfolio-filter {
        flex-direction: column;
        align-items: center;
    }
    
    .filter-btn {
        width: 100%;
        margin-bottom: 10px;
    }
    
    .map-container {
        height: 300px;
    }
}