.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 56px;
    height: 56px;
    background: url('../img/scripts/top-button.svg') no-repeat center;
    background-size: contain;
    background-color: transparent;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: none;
    filter: drop-shadow(0 4px 10px rgba(0, 0, 0, 0.35));
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: opacity var(--transition-normal),
                visibility var(--transition-normal),
                transform var(--transition-normal);
    z-index: 50;
}

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

.back-to-top:hover {
    transform: translateY(-4px) scale(1.06);
}

.back-to-top svg {
    width: 26px;
    height: 26px;
    fill: var(--color-brand-yellow);
    transition: transform var(--transition-fast);
    transform-origin: center;
}

.back-to-top:hover svg {
    transform: translateY(-2px);
}