/* icon LINE riêng */
.line-icon img {
    width: 45px;      /* chỉnh tùy ý */
    cursor: pointer;
}

/* nền mờ */
.popup {
    display: none; 
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

/* khung hiển thị QR */
.popup-content {
    position: relative;
    background: #ffffff;
    padding: 20px;
    border-radius: 16px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.2);
    animation: popupShow 0.25s ease;
}

/* ảnh QR */
.qr-img {
    width: 260px;    /* chỉnh kích thước ở đây */
    height: auto;
    display: block;
}

/* nút đóng popup */
.close-btn {
    position: absolute;
    top: -10px;
    right: -10px;
    background: #fff;
    color: #333;
    font-size: 26px;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    text-align: center;
    line-height: 30px;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0,0,0,0.25);
}

/* hiệu ứng mượt */
@keyframes popupShow {
    from { transform: scale(0.8); opacity: 0; }
    to   { transform: scale(1); opacity: 1; }
}