.open-popup-btn{
    padding:10px 20px;
    margin:50px;
    cursor:pointer;
}

/* Popup */
.product-popup{
    position:fixed;
    inset:0;
    background:rgba(0,0,0,.95);
    display:none;
    justify-content:center;
    align-items:center;
    z-index:99999;
}

.product-popup.active{
    display:flex;
}

/* Close */
.close-popup{
    position:absolute;
    top:20px;
    right:30px;
    color:#fff;
    font-size:45px;
    cursor:pointer;
    z-index:100000;
}

/* Layout */
.popup-gallery{
    display:flex;
    gap:20px;
    width:90%;
    height:90vh;
}

/* Thumbnails */
.thumbnail-list{
    width:100px;
    overflow-y:auto;
    display:flex;
    flex-direction:column;
    gap:10px;
}

.thumbnail-list img{
    width:80px;
    height:80px;
    object-fit:cover;
    cursor:pointer;
    border:2px solid transparent;
}

.thumbnail-list img.active{
    border:2px solid #fff;
}

/* Main Image Area */
.main-image-wrapper{
    flex:1;
    overflow:hidden;
    display:flex;
    justify-content:center;
    align-items:center;
    cursor:zoom-in;
}

#mainImage{
    max-width:100%;
    max-height:100%;
    transition:transform .15s ease;
    transform-origin:center center;
}

/* Mobile */
@media(max-width:768px){

    .popup-gallery{
        flex-direction:column-reverse;
        width:95%;
    }

    .thumbnail-list{
        width:100%;
        flex-direction:row;
        overflow-x:auto;
        overflow-y:hidden;
    }

    .thumbnail-list img{
        flex-shrink:0;
    }
}