.back-to-top {
    position: fixed;
    bottom: 30px;
    left: 30px;
    width: 50px;
    height: 50px;
    background: rgba(113, 88, 226, 0.2);
    border: 1px solid var(--border);
    border-radius: 50%;
    color: var(--cyan);
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 999;
}

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

.back-to-top:hover {
    background: rgba(113, 88, 226, 0.4);
    transform: translateY(-5px);
}