body {
    font-family: 'Microsoft YaHei', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f5f5f5;
    color: #333;
}

.header {
    background-color: #fff;
    padding: 20px;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.logo {
    font-size: 1.8em;
    font-weight: bold;
}

.product-main {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 40px;
    gap: 40px;
}

.product-gallery {
    flex: 1;
}

.product-image {
    width: 100%;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.product-details {
    flex: 1;
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.product-title {
    font-size: 1.5em;
    margin-bottom: 10px;
}

.product-price {
    font-size: 1.2em;
    color: #e74c3c;
    margin-bottom: 10px;
}

.product-stock {
    font-size: 0.9em;
    color: #2ecc71;
    margin-bottom: 20px;
}

.product-description {
    margin-bottom: 20px;
}

.add-to-cart {
    background-color: #3498db;
    color: #fff;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.add-to-cart:hover {
    background-color: #2980b9;
}

/* 模态框样式 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.4);
}

.modal-content {
    background-color: #fefefe;
    margin: 15% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 80%;
    max-width: 500px;
    border-radius: 8px;
    text-align: center;
}

.close-button {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close-button:hover,
.close-button:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;
}

.qr-codes {
    display: flex;
    justify-content: space-around;
    margin-top: 20px;
}

.qr-code img {
    width: 150px;
    height: 150px;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.qr-code p {
    margin-top: 10px;
    font-size: 1em;
    color: #333;
}

/* 支付方式选择按钮样式 */
.payment-option {
    background-color: #3498db;
    color: #fff;
    padding: 10px 20px;
    margin: 10px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.payment-option:hover {
    background-color: #2980b9;
}

/* 二维码图片样式 */
#qrCodeImage {
    width: 100%;
    height: auto;
    max-width: 300px;
    max-height: 300px;
    margin-top: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.back-button {
    display: inline-block;
    margin-right: 20px;
    padding: 10px 15px;
    background-color: #f0f0f0;
    color: #333;
    text-decoration: none;
    border-radius: 5px;
    font-size: 16px;
    transition: background-color 0.3s ease;
}

.back-button:hover {
    background-color: #e0e0e0;
}