@mixin btn-day($with-disabled: true) {
    $base-color: white;

    .btn-day {
        color: var(--text-fg);
        background-color: $base-color;
        border-color: var(--medium-border) !important;

        @content ($base-color);

        &:hover {
            background-color: darken($base-color, 8%);
        }

        &:active,
        &.active {
            @include impressed-shadow(0.25);
        }

        &:active.active {
            box-shadow: none;
        }

        @if ($with-disabled) {
            &[disabled] {
                background-color: $base-color !important;
                box-shadow: none !important;
            }
        }
    }
}

@mixin btn-night($with-disabled: true) {
    $base-color: #666;

    .btn-night {
        color: var(--text-fg);
        background-color: $base-color;
        border-color: $base-color;

        @content ($base-color);

        &:hover {
            background-color: lighten($base-color, 8%);
            border-color: lighten($base-color, 8%);
        }

        &:active,
        &.active {
            @include impressed-shadow(0.35);
            border-color: darken($base-color, 8%);
        }

        &:active.active {
            box-shadow: none;
            border-color: $base-color;
        }

        @if ($with-disabled) {
            &[disabled] {
                background-color: $base-color !important;
                box-shadow: none !important;
                border-color: $base-color !important;
            }
        }
    }
}

@mixin impressed-shadow($intensity) {
    box-shadow: inset 0 calc(var(--toolbar-size) / 15) calc(var(--toolbar-size) / 5)
        rgba(black, $intensity);
}

@mixin rainbow($base) {
    background: content-box
            linear-gradient(217deg, rgba(255, 0, 0, 0.8), rgba(255, 0, 0, 0) 70.71%),
        content-box
            linear-gradient(127deg, rgba(0, 255, 0, 0.8), rgba(0, 255, 0, 0) 70.71%),
        content-box
            linear-gradient(336deg, rgba(0, 0, 255, 0.8), rgba(0, 0, 255, 0) 70.71%),
        border-box $base;
}