body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}
.header {
    background-color: #333;
    color: #fff;
    padding: 10px 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.logo {
    display: flex;
    align-items: center;
    position: absolute;
    left: 20px;
}

.logo img {
    height: 40px;
    margin-right: 10px;
}

.nav-toggle {
    display: none;
    cursor: pointer;
    position: absolute;
    right: 20px;
}

.nav {
    display: flex;
    gap: 40px;
    justify-content: center;
}

.nav a {
    color: #fff;
    text-decoration: none;
    padding: 5px 10px;
    transition: background-color 0.3s;
}

.nav a:hover {
    background-color: #555;
}

.customer-service {
    display: none;
}

@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }

    .nav {
        display: none;
        flex-direction: column;
        gap: 10px;
        position: absolute;
        top: 60px;
        left: 0;
        width: 100%;
        background-color: #333;
        padding: 10px;
        z-index: 1000;
        text-align: center;
    }

    .nav.active {
        display: flex;
    }

    .customer-service {
        display: block;
        position: absolute;
        right: 20px;
    }

    .customer-service img {
        height: 40px;
        cursor: pointer;
    }
}




.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px 0;
}
.section {
    margin-bottom: 40px;
}
.section-title {
    font-size: 24px;
    margin-bottom: 20px;
}
.product-list {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
}

.product-item {
    background: #fff;
    padding: 10px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    text-align: center;
    flex: 0 1 calc(25% - 20px);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.product-item img {
    max-width: 50%;
    height: auto;
    /*margin-bottom: 10px;*/
}

.product-item h3 {
    font-size: 1.2em;
    margin: 10px 0;
}

.product-item p {
    font-size: 0.9em;
    color: #555;
    margin-bottom: 10px;
}

.buy-button {
    display: inline-block;
    margin-top: auto;
    padding: 8px 16px;
    background-color: #333;
    color: #fff;
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s;
}

.buy-button:hover {
    background-color: #555;
}

@media (max-width: 768px) {
    .product-item {
        flex: 0 1 calc(50% - 20px);
    }
}

@media (max-width: 480px) {
    .product-item {
        flex: 0 1 calc(100% - 20px);
    }
}

.case-item {
    margin-bottom: 20px;
    background: #fff;
    padding: 20px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}
.faq-item {
    margin-bottom: 10px;
    background: #fff;
    padding: 20px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}
.faq-question {
    cursor: pointer;
    font-weight: bold;
    margin-bottom: 10px;
}
.faq-answer {
    display: none;
    padding-left: 20px;
}
.contact-us {
    display: flex;
    gap: 20px;
    background: #fff;
    padding: 20px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}
.contact-left {
    flex: 1;
    text-align: center;
}
.contact-right {
    flex: 2;
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.contact-right p {
    margin: 5px 0;
    font-size: 16px;
}
.qr-code {
    width: 100%;
    max-width: 200px;
}
.footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 20px 0;
    font-size: 14px;
}
.footer a {
    color: #fff;
    text-decoration: none;
}
.buy-button {
    display: inline-block;
    margin-top: 10px;
    padding: 10px 20px;
    background-color: #333;
    color: #fff;
    text-decoration: none;
    border-radius: 5px;
}
.buy-button:hover {
    background-color: #555;
}
.carousel {
    position: relative;
    max-width: 100%;
    margin: 20px auto;
    overflow: hidden;
}
.carousel img {
    width: 100%;
    height: auto;
    display: block;
}
.carousel-inner {
    display: flex;
    transition: transform 0.5s ease-in-out;
}
.carousel-inner div {
    min-width: 100%;
    box-sizing: border-box;
}
.carousel-indicators {
    display: flex;
    justify-content: center;
    position: absolute;
    bottom: 10px;
    width: 100%;
}
.carousel-indicator {
    height: 10px;
    width: 10px;
    margin: 0 5px;
    background-color: #fff;
    border-radius: 50%;
    cursor: pointer;
}
.carousel-indicator.active {
    background-color: #333;
}
.customer-service {
    margin-right: 20px;
}
.customer-service img {
    height: 40px;
    cursor: pointer;
}
.brand-list {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
}

.brand-item {
    background: #fff;
    padding: 10px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    text-align: center;
    flex: 0 0 calc(25% - 20px);
}

.brand-item img {
    width: 160px;
    height: 100px;
    object-fit: contain;
}

@media (max-width: 768px) {
    .brand-item {
        flex: 0 0 calc(50% - 20px);
    }
}