@import url("https://cdn.jsdelivr.net/npm/bootstrap-icons@1.13.1/font/bootstrap-icons.min.css");
body{
    background:#f7f7f9;
}
.nav-link.active{
    font-weight:bold;
    color:#0d6efd !important;
}
.content-wrapper{
    padding:20px;
}

#stage-wrap{
    max-width: 1100px;
    margin: 20px auto;
    position: relative;
    padding: 0 !important;
    overflow: hidden;
}
#glcanvas{
    display: block;
    width: 100%;
    height: auto;
    border-radius: 12px;
    background: #ddd;
}

#compareCanvas{
    position: absolute;
    top: 0;
    left: 0;
    border-radius: 12px;
    pointer-events: none;
}

#compare-handle{
    position: absolute;
    width: 3px;
    background: #ffffff;
    border-left: 1px solid rgba(0,0,0,0.3);
    border-right: 1px solid rgba(0,0,0,0.3);
    cursor: ew-resize;
    z-index: 20;
    pointer-events: auto;
}
#compare-handle::before{
    content: '';
    position: absolute;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: rgba(0,0,0,0.8);
    box-shadow: 0 0 4px rgba(0,0,0,0.6);
    top: 50%;
    left: 50%;
    margin-top: -13px;
    margin-left: -13px;
}
#compare-handle::after{
    content: '⇆';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 12px;
    color: #fff;
}

.btn-toggle-group .btn{
    flex:1 1 0;
}