.back-to-top {
        position: fixed;
        bottom: 2rem;
        right: 2rem;
        width: 48px;
        height: 48px;
        background-color: var(--color-primary, #2563eb); 
        color: white;
        border: none;
        border-radius: 8px;
        display: flex;
        align-items: center;
        justify-content: center;
        cursor: pointer;
        opacity: 0;
        visibility: hidden;
        transform: translateY(20px);
        transition: all 0.3s ease;
        z-index: 9999;
        box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    }

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

    /* Hover state */
    .back-to-top:hover {
        filter: brightness(90%); /* Simple darken effect */
        transform: translateY(-4px);
        box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    }
    
    .back-to-top svg {
        width: 24px;
        height: 24px;
        stroke-width: 3;
    }

    /* Mobile adjustments */
    @media (max-width: 768px) {
        .back-to-top {
            bottom: 1.5rem;
            right: 1.5rem;
            width: 42px;
            height: 42px;
        }
    }