/* 响应式设计 */
@media (max-width: 1200px) {
    .container {
        width: 95%;
    }
}

@media (max-width: 992px) {
    .about, 
    .contact-container {
        grid-template-columns: 1fr;
    }
    
    .about-img {
        order: -1;
    }
    
    .hero h2 {
        font-size: 42px;
    }
    
    .hero p {
        font-size: 18px;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .section-title {
        font-size: 32px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background-color: var(--white-color);
        flex-direction: column;
        align-items: center;
        justify-content: flex-start;
        padding-top: 30px;
        transition: var(--transition);
    }
    
    .nav-links.active {
        left: 0;
    }
    
    .nav-links li {
        margin: 15px 0;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .hero h2 {
        font-size: 36px;
    }
    
    .hero p {
        font-size: 16px;
    }
    
    .hero-btns .btn {
        display: block;
        margin: 10px auto;
        width: 80%;
    }
    
    .section {
        padding: 50px 0;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .about-stats {
        flex-direction: column;
    }
    
    .stat-item {
        margin-bottom: 20px;
    }
}

@media (max-width: 576px) {
    .hero h2 {
        font-size: 28px;
    }
    
    .hero p {
        font-size: 14px;
    }
    
    .section-title {
        font-size: 24px;
    }
    
    .section-subtitle {
        font-size: 16px;
    }
    
    .service-card {
        margin-bottom: 20px;
    }
    
    .footer-column {
        margin-bottom: 30px;
    }
}