.dt-sidebar {
  width: 224px;

  display: block;
  position: relative;
  height: 100%;

  transition: width ease 200ms;
}

.dt-sidebar-ul {
  list-style-type: none;
  padding: 0;
  margin: 0;
  height: 100%;
  z-index: 2;
  background: #2f3d4a;
  position: absolute;

  overflow: auto;

  top: 0;
  width: 100%;
}

.dt-sidebar-inline-collapsed {
  width: 64px;

  .dt-sidebar-item i {
    margin-right: 0;
  }

  .dt-sidebar-item i ~ *,
  .dt-sidebar-logo i ~ * {
    display: none;
  }

  .dt-sidebar-subSidebar-arrow {
    opacity: 0;
  }

  .dt-sidebar-logo {
    i ~ *, img ~ * {
      display: none;
    }
  }

  .dt-expend-btn {
    display: block;
  }
  .dt-sidebar-subSidebar-open {
    .dt-sidebar-sub {
      display: none;
    }
  }
  .dt-sidebar-ul {
    overflow: inherit;
  }
}

.dt-is-sub-drawer {
  .dt-sidebar-sub {
    display: none;
  }
}

.dt-expend-btn {
  position: absolute;
  right: -16px;
  top: 50%;
  margin-top: -15px;
  width: 16px;
  height: 30px;
  background: #e5e9ee;
  cursor: pointer;
  z-index: 2;

  transform: translateY(-2px);
  &::after {
    top: 9px;
    left: 9px;
    transform: rotate(45deg) translateX(-2px);
  }
  &::before {
    top: 12px;
    left: 6px;
    transform: rotate(-45deg) translateX(2px);
  }
}

.dt-expend-btn::before,
.dt-expend-btn::after {
  content: "";
  vertical-align: baseline;
  background: #999;
  width: 1.5px;
  height: 6px;
  border-radius: 2px;
  display: block;
  position: relative;
  transition: background .3s cubic-bezier(.645, .045, .355, 1), transform .3s cubic-bezier(.645, .045, .355, 1), top .3s cubic-bezier(.645, .045, .355, 1);
}
