.dark {
    --board-bgcolor: #232323;
    --board-color : #F7F7F7;
    --board-header-bgcolor: #3b393a;
    --board-header-color : #F7F7F7;

    --board-nav-bgcolor: #353535;
    --board-nav-color : #F7F7F7;
    --board-nav-font-size: 1.3rem;
    --board-nav-font-size: 500;

    --board-group-bgcolor: #2c2c2c;
    --board-group-color : #F7F7F7;
}

.board {
    width: 100%;
    background-color: var(--board-bgcolor, #F7F7F7);
    /*
    background: -webkit-linear-gradient(top,#fff,#188dfa)
    */
}

/***************************** board-header ***************************/

.board>header {
    background-color: var(--board-header-bgcolor, #1459af);
    color: var(--board-header-color, #FFF);
    height: var(--board-header-height, 5rem) !important;
}

.board>header .grouper {
    display: flex;
    align-items: center;
}

.board>header .grouper .field-box {
    margin-left: 1rem !important;
    border: solid 0px;
    border-bottom: solid 1px var(--divider-color);
}

.board>header .grouper select {
    height: 2.5rem !important;
}

/***************************** board-nav ***************************/
.board>nav {
    position: relative;
    padding: .5rem;
}

.board>nav>header {
    background-color: var(--board-nav-bgcolor);
    color: var(--board-nav-color);
    height: var(--board-nav-height, 5rem) !important;
    font-size: var(--board-nav-font-size , 1.3rem) !important;
    font-weight: var(--board-nav-font-weight, 500) !important;
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.board>nav>header .icon {
    transform: rotate(90deg);
}

.board>nav>header.collapsed {
    flex: 0;
    min-width: 4rem;
    border-left: solid 1px var(--divider-color);
    border-right: solid 1px var(--divider-color);
}

.board>nav>.icon {
    display: none;
}

@media (max-width: 460px) {
    .board>nav>.icon {
        display: flex;
        position: absolute;
    }
    .board>nav>.icon-left {
        top: 2px;
        left: 2px;
    }
    .board>nav>.icon-right {
        top: 2px;
        right: 2px;
    }
    .board>nav>header {
        display: none !important;
    }
    .board>nav>header.selected {
        display: flex !important;
        border: solid 1px var(--divider-color) !important;
    }
    .board-column:not(.selected) {
        display: none !important;
    }
}

.board>main {
    overflow: hidden;
}

/***************************** board-group ***************************/

.board-group {

    background-color: var(--board-group-bgcolor, rgba(200,200,200,.2));
    margin: .5rem;
    border-radius: 5px;
   
}

.board-group>header {
    max-height: 3rem;
    font-weight: 500;
    color: var(--board-group-color);
}

.board-group>main {
    display: flex;
}

.board-column {
    position:relative;
    border-collapse: collapse;
    flex: 1;
}

.board-column:nth-child(n+2) {
    border-left: solid 0px;
}

.board-column.collapsed {
    flex: 0;
    min-width: 4rem;
    border-left: solid 1px var(--divider-color);
    border-right: solid 1px var(--divider-color);
}

.board-column.collapsed>main {
    min-height: 10rem;
    padding: 1rem;
    writing-mode:vertical-rl;
    color: var(--primary-color-light);
}

.board-column>main {
    height: 100%;
    overflow-y: auto;
}

.board-card {
    margin: 1rem;
    min-height: 4rem;
    border: solid 1px var(--divider-color);
    background-color: var(--paper-color);
}

.board-card:hover {
    box-shadow: var(--shadow1);
}

.board-card:active {
    transition: all .2s;
    box-shadow: var(--shadow2);
}

.demo-card>main {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;
}

.demo-card>footer {
    display: flex;
    justify-content: flex-end;
}