/* 回到顶部按钮样式 */
.back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: #FF7D00;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 99;
    box-shadow: 0 4px 10px rgba(255, 125, 0, 0.3);
}

.back-to-top:hover {
    transform: scale(1.1);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}
@media (max-width: 767px) {
    .back-to-top {
        position: fixed;
        bottom: 100px;
        right: 20px;
        width: 50px;
        height: 50px;
        border-radius: 50%;
        background-color: #FF7D00;
        color: white;
        display: flex;
        align-items: center;
        justify-content: center;
        cursor: pointer;
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        z-index: 99;
        box-shadow: 0 4px 10px rgba(255, 125, 0, 0.3);
    }
}