.back-to-top {
    position: fixed;
    right: 30px;
    bottom: 30px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(87, 154, 71, 0.9);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 999;
}

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

.back-to-top:hover {
    background: rgba(87, 154, 71, 1);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(87, 154, 71, 0.2);
}

.back-to-top:active {
    transform: translateY(0);
}

.back-to-top svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
}