.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--card-bg-color);
    border: 1px solid rgba(124, 138, 255, 0.3);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 1000;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s ease;
    visibility: hidden;
}

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

.back-to-top:hover {
    background: var(--card-secondary-bg-color);
    border-color: rgba(124, 138, 255, 0.5);
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25);
}

.back-to-top:active {
    transform: translateY(0);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.back-to-top svg {
    width: 24px;
    height: 24px;
    color: var(--primary-color);
    transition: all 0.3s ease;
}

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

@media (max-width: 768px) {
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
}