/* 返回顶部按钮样式 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    background-color: #00a0e9;
    color: white;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    text-decoration: none;
    font-size: 16px;
    font-weight: bold;
}

.back-to-top:hover {
    background-color: #007bb5;
    transform: scale(1.1);
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}