/* 响应式设计 */
@media (max-width: 1200px) {
    .hero {
        padding: 120px 100px;
    }
}

@media (max-width: 992px) {
    .about-content {
        flex-direction: column;
    }

    .hero {
        padding: 100px 50px;
    }

    .hero-title {
        font-size: 2.8rem;
    }
}

@media (max-width: 768px) {
    .hamburger {
        display: block;
        z-index: 101;
    }

    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background-color: white;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        transition: var(--transition);
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
    }

    .nav-menu.active {
        right: 0;
    }

    .nav-item {
        margin: 15px 0;
    }

    .hero {
        padding: 80px 20px;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .herohome-title {
        font-size: 2.2rem;
    }

    .herohome-subtitle {
        font-size: 1.2rem;
    }

    .section {
        padding: 60px 0;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .certificate-grid {
        grid-template-columns: 1fr;
    }

    .product-grid,
    .advantage-grid,
    .culture-grid,
    .csr-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 576px) {
    .container {
        width: 95%;
    }

    .hero-title {
        font-size: 2rem;
    }

    .herohome-title {
        font-size: 1.8rem;
    }

    .btn {
        padding: 10px 20px;
        font-size: 14px;
    }

    .card,
    .advantage-card,
    .culture-card,
    .product-card,
    .csr-card {
        padding: 20px;
    }

    .file-modal-content {
        width: 95%;
    }
}