/* 响应式设计 */

@media (max-width: 1100px) {
    .slide-text h2 {
        font-size: 40px;
    }
    .carousel {
        height: 500px;
    }
}

@media (max-width: 900px) {
    .fp-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .product-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .choose-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .contact-inner {
        grid-template-columns: 1fr;
    }

    .footer-inner {
        grid-template-columns: repeat(2, 1fr);
    }

    .usage-row {
        grid-template-columns: repeat(2, 1fr);
    }

    .usage-col {
        min-height: 100px;
    }
}

@media (max-width: 768px) {
    .top-bar {
        display: none;
    }

    .mobile-toggle {
        display: flex;
    }

    .nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 20px;
        gap: 15px;
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: all 0.3s;
    }

    .nav.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }

    .nav ul {
        flex-direction: column;
        width: 100%;
    }

    .nav ul li {
        width: 100%;
    }

    .nav ul li a {
        padding: 12px 15px;
    }

    .search-box {
        width: 100%;
    }

    .search-box input {
        width: 100%;
    }

    .header-inner {
        position: relative;
    }

    .carousel {
        height: 400px;
    }

    .slide-text h2 {
        font-size: 28px;
    }

    .slide-text p {
        font-size: 14px;
    }

    .features {
        gap: 15px;
    }

    .feature-item {
        font-size: 12px;
        padding: 8px 12px;
    }

    .carousel-btn {
        width: 38px;
        height: 38px;
        font-size: 22px;
    }

    .carousel-btn.prev {
        left: 15px;
    }

    .carousel-btn.next {
        right: 15px;
    }

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

    .section-title h2 {
        font-size: 24px;
    }

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

    .news-item {
        flex-direction: column;
        gap: 15px;
    }

    .n-image {
        flex: 0 0 auto;
        aspect-ratio: 16 / 9;
    }

    #messageForm .form-row:first-child {
        grid-template-columns: 1fr;
    }

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

    .float-consult {
        right: 10px;
    }

    .fc-item {
        width: 60px;
        font-size: 11px;
        padding: 10px 4px;
    }

    .logo-text h1 {
        font-size: 16px;
    }

    .logo-text p {
        font-size: 10px;
    }

    .logo img {
        width: 45px;
        height: 45px;
    }

    .about {
        padding: 60px 0;
    }

    .product-usage {
        padding: 50px 0;
    }

    .why-choose {
        padding: 60px 0;
    }

    .contact-section {
        padding: 60px 0;
    }

    .usage-row {
        grid-template-columns: 1fr;
    }

    .usage-col {
        border-right: none;
        border-bottom: 1px solid #eee;
    }

    .usage-row:nth-child(odd) .usage-col {
        border-right: none;
    }
}

@media (max-width: 480px) {
    .slide-text h2 {
        font-size: 22px;
    }

    .btn-primary {
        padding: 10px 24px;
        font-size: 13px;
    }

    .section-title {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .section-title .line {
        width: 30px;
    }

    .product-tabs {
        gap: 6px;
    }

    .product-tabs .tab {
        padding: 6px 14px;
        font-size: 12px;
    }
}