/* Back To Top Button Component */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 48px;
    height: 48px;
    background-color: var(--color-bg-surface);
    color: var(--color-text-main);
    border: 1px solid var(--color-border);
    border-radius: 50%;
    box-shadow: 0 4px 12px var(--color-shadow);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-normal);
}

.back-to-top:hover {
    background-color: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: 0 6px 16px var(--color-shadow);
}

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

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

.back-to-top i {
    font-size: 1.25rem;
}

@media (max-width: 768px) {
    .back-to-top {
        bottom: var(--spacing-lg);
        right: var(--spacing-lg);
        width: 40px;
        height: 40px;
    }
}