/* 回到頂部按鈕樣式 */

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--primary);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 999;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

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

.back-to-top:hover {
    background-color: var(--secondary);
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.back-to-top i {
    font-size: 20px;
}

/* 箭頭效果 */
.arrow-up {
    width: 12px;
    height: 12px;
    border-left: 3px solid #fff;
    border-top: 3px solid #fff;
    transform: rotate(45deg);
    display: inline-block;
    margin-top: 4px;
}