window.addEventListener('load', () => {
    const itemGrid = document.querySelectorAll('.grid__item');

    const addFilter = () => {
        itemGrid.forEach(item => {
            const offImg = item.querySelector('[data-action="off"]');

            offImg.style.filter = "grayscale(1) invert(.3)";
        });
    }

    const removeFilter = () => {
        itemGrid.forEach(item => {
            const offImg = item.querySelector('[data-action="off"]');

            offImg.style.filter = "none";
        });
    }

    itemGrid.forEach(item => {
        const onImg = item.querySelector('[data-action="on"]');
        const offImg = item.querySelector('[data-action="off"]');

        item.addEventListener('mousemove', () => {
            offImg.style.opacity = '0';
            onImg.style.opacity = '1';
            addFilter();
        });
        item.addEventListener('mouseout', () => {
            offImg.style.opacity = '1';
            onImg.style.opacity = '0';
            removeFilter();
        });
    });
});