.i-button-group{
    @import (reference) "../i/i.less";
    display: inline-flex;
    flex-wrap: nowrap;
    position: relative;
    z-index: 0;
    
    .i-button {
        position: relative;
        z-index: 0;
        
        &:not(:last-child){
            border-top-right-radius: 0;
            border-bottom-right-radius: 0;
        }

        &:not(:first-child){
            border-top-left-radius: 0;
            border-bottom-left-radius: 0;
            margin-left: -1px;
        }
        
        
        
        &__checked{
            z-index: 1;
        }
        
        &:focus{
            z-index: 2;
        }
        
        &:hover{
            z-index: 3;
        }
        
        &.i-button__disabled, &.i-button__loading{
            z-index: -1;
        }
    }
}