/* Back to top button */
.back-to-top {
    position: fixed;
    bottom: 40px;
    left: 20px;
    width: 40px;
    height: 40px;
    background-color: #000;
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.3s ease;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background-color: #333;
    transform: translateY(-2px);
}

.back-to-top::after {
    content: "↑";
    font-size: 20px;
    font-weight: bold;
}
@media (max-width: 768px) {
    .back-to-top {
        bottom: 76px;
        left: 15px;
    }
}