SASS Mixin and Hover: How to write the Hover by changing mixin parameters?

Question

Hi. I’m new to SASS, so I’m sorry if it’s a silly question, but I couldn’t find anywhere on the Internet with an answer for her, so...

I’m working on a project that has a button template. I created a mixin to define how it will be.

@mixin btn($bg:#fff, $color:$blue, $border:none) {
    display: inline-block;
    font-weight: 700;
    text-transform: uppercase;
    font-size: 1em;
    text-align: center;
    padding: 15px 35px 16px;
    margin: 10px auto;
    border: $border;
    border-radius: 50% 0;
    background: $bg;
    color: $color;
    position: relative;
    z-index: 50;
}

When I call the button, I can pass different properties through the parameters to create color variations and etc.

.main-btn {
    @include btn($bg:transparent,$border:2px solid $blue);
}

My question is this: if I want to make a Hover on this button, there is some way I can write it changing only the values of the mixin parameters, not to write all the changes of the Hover in full (type "background-color: $blue", "color: #fff", etc)?

I thought I’d do something like this:

.main-btn {
    @include btn($bg:transparent, $border:2px solid $blue);
    &:hover {
        @include btn($bg:$blue, $color:#fff, $border:none);
    }
}

But when I do it, it actually does the entire mixin include, including rewriting all the static default properties again, and then the file. css gets huge.

Is there any way to do Hover just by changing the values of the parameters passed in a mixin already included in the class?