/* Back to Top Button - Легкий CSS */
#back-to-top {
    position: fixed;
    width: 50px;
    height: 50px;
    background: #333;
    color: #fff;
    border: none;
    border-radius: 50%;
    font-size: 24px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

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

#back-to-top:hover {
    background: #555;
    transform: translateY(-3px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

#back-to-top:active {
    transform: translateY(-1px);
}

/* Адаптивность для мобильных устройств */
@media (max-width: 768px) {
    #back-to-top {
        width: 45px;
        height: 45px;
        font-size: 20px;
    }
}