/*  
---------------------------------------------------
Buttons
---------------------------------------------------  
*/

.btn, button.btn { 
    margin: 5px 0;
}

.btn, button.btn {
    border-radius: var(--btn-border-radius);
    border-width: var(--btn-border-width); 
    border-style: solid;
    outline: none;
    box-shadow: var(--btn-box-shadow_h) var(--btn-box-shadow_v) var(--btn-box-shadow_b) rgba(var(--true-black), var(--btn-box-shadow_o));
}

.btn:hover, button.btn:hover,
.btn:focus, button.btn:focus,
.btn:active, button.btn:active {
    box-shadow: var(--btn-box-shadow_h) var(--btn-box-shadow_v) var(--btn-box-shadow_b) rgba(var(--base-btn-borders-hover), var(--btn-box-shadow_o));
}

.btn, button.btn, button {

    -webkit-transition:
        opacity 0.3s ease-in-out 0s,
        color 0.3s ease-in-out 0s,
        background-color 0.3s ease-in-out 0s,
        text-decoration 0.3s ease-in-out 0s,
        top 0.3s ease-in-out 0s,
        right 0.3s ease-in-out 0s,
        bottom 0.3s ease-in-out 0s,
        left 0.3s ease-in-out 0s,
        width 0.3s ease-in-out 0s,
        max-width 0.3s ease-in-out 0s,
        height 0.3s ease-in-out 0s,
        max-height 0.3s ease-in-out 0s,
        padding-top 0.3s ease-in-out 0s,
        padding-right 0.3s ease-in-out 0s,
        padding-bottom 0.3s ease-in-out 0s,
        padding-left 0.3s ease-in-out 0s,
        box-shadow 0.3s ease-in-out 0s,
        border-color 0.3s ease-in-out 0s;
    transition:
        opacity 0.3s ease-in-out 0s,
        color 0.3s ease-in-out 0s,
        background-color 0.3s ease-in-out 0s,
        text-decoration 0.3s ease-in-out 0s,
        top 0.3s ease-in-out 0s,
        right 0.3s ease-in-out 0s,
        bottom 0.3s ease-in-out 0s,
        left 0.3s ease-in-out 0s,
        width 0.3s ease-in-out 0s,
        max-width 0.3s ease-in-out 0s,
        height 0.3s ease-in-out 0s,
        max-height 0.3s ease-in-out 0s,
        padding-top 0.3s ease-in-out 0s,
        padding-right 0.3s ease-in-out 0s,
        padding-bottom 0.3s ease-in-out 0s,
        padding-left 0.3s ease-in-out 0s,
        box-shadow 0.3s ease-in-out 0s,
        border-color 0.3s ease-in-out 0s;
}

.btn, button.btn {
    padding:var(--btn-padding_top) var(--btn-padding_right) var(--btn-padding_bottom) var(--btn-padding_left);
}

.btn.btn-sm, button.btn.btn-sm {
    padding:var(--btn_sm-padding_top) var(--btn_sm-padding_right) var(--btn_sm-padding_bottom) var(--btn_sm-padding_left);
}

.btn.btn-lg, button.btn.btn-lg {
    padding:var(--btn_lg-padding_top) var(--btn_lg-padding_right) var(--btn_lg-padding_bottom) var(--btn_lg-padding_left);
}

.basic-buttons .btn, .basic-buttons button.btn, .btn.basic-btn, button.btn.basic-btn {
    padding:2px 0!important;
    background:none!important;
    border-width:0 0 var(--base-border-width) 0!important;
    border-radius: 0!important;
}


/*  
---------------------------------------------------
Button hovers 

This could is related to the inclusion of gradient backgrounds. 
We need to include empty <span> inside buttons to activate hover.
---------------------------------------------------  
*/

.btn { 
    position:relative;
    z-index: 1; /* matters! */
}
.btn > span { 
    position: absolute; top:0; right:0; bottom:0; left:0; z-index: -1;
    border-radius: calc(var(--btn-border-radius) - var(--btn-border-width));
    opacity: 0;

    -webkit-transition:
        opacity 0.3s ease-in-out 0s,
        color 0.3s ease-in-out 0s,
        background-color 0.3s ease-in-out 0s,
        text-decoration 0.3s ease-in-out 0s,
        top 0.3s ease-in-out 0s,
        right 0.3s ease-in-out 0s,
        bottom 0.3s ease-in-out 0s,
        left 0.3s ease-in-out 0s,
        width 0.3s ease-in-out 0s,
        max-width 0.3s ease-in-out 0s,
        height 0.3s ease-in-out 0s,
        max-height 0.3s ease-in-out 0s,
        padding-top 0.3s ease-in-out 0s,
        padding-right 0.3s ease-in-out 0s,
        padding-bottom 0.3s ease-in-out 0s,
        padding-left 0.3s ease-in-out 0s,
        box-shadow 0.3s ease-in-out 0s,
        border-color 0.3s ease-in-out 0s,
        transform 0.3s ease-in-out 0s;
    transition:
        opacity 0.3s ease-in-out 0s,
        color 0.3s ease-in-out 0s,
        background-color 0.3s ease-in-out 0s,
        text-decoration 0.3s ease-in-out 0s,
        top 0.3s ease-in-out 0s,
        right 0.3s ease-in-out 0s,
        bottom 0.3s ease-in-out 0s,
        left 0.3s ease-in-out 0s,
        width 0.3s ease-in-out 0s,
        max-width 0.3s ease-in-out 0s,
        height 0.3s ease-in-out 0s,
        max-height 0.3s ease-in-out 0s,
        padding-top 0.3s ease-in-out 0s,
        padding-right 0.3s ease-in-out 0s,
        padding-bottom 0.3s ease-in-out 0s,
        padding-left 0.3s ease-in-out 0s,
        box-shadow 0.3s ease-in-out 0s,
        border-color 0.3s ease-in-out 0s,
        transform 0.3s ease-in-out 0s;
}
a:hover .btn > span, 
a:focus .btn > span, 
a:active .btn > span, 
.btn:hover > span,
.btn:focus > span,
.btn:active > span {
  opacity: 1;
}

.basic-buttons .btn > span, 
.basic-buttons button.btn > span, 
.btn.basic-btn > span, button.btn.basic-btn > span {
    display:none!important;
}