body {
  font-family: Arial;
  margin: 0;
}
/* page layout */
.wrapper {
	display: grid;
	grid-template-areas:
    "header"
    "settings"
		"graphs"
		"tree";

	width: 100%;
	grid-gap: 30px;
}
.main-head {
	grid-area: header;
  padding: 60px;
  text-align: center;
  background: #1abc9c;
  color: white;
  font-size: 48pt;
}
#tree {
	grid-area: tree;
  margin: 0 10px;
}
#settings {
	grid-area: settings;
  margin: 0 10px;
}

/* texts and spacers */
#tree li.spacer {
  padding-top: 20px;
}
#tree .channel.header {
  font-weight: bold;
}


/* counts and checkboxes */
#tree, #tree li {
  display: grid;
  grid-template-columns: auto 20px 20px;
  align-content: start;
}
#tree .name {
  grid-row: 1/2;
  grid-column: 1/2;
}
#tree .count {
  grid-row: 1/2;
  grid-column: 2/3;
  justify-self: end;
  width: 100%;
}
#tree .checkbox {
  grid-row: 1/2;
	grid-column: 3/4;
}
#tree ul {
  grid-row: 2/3;
  grid-column: 1/4;
}

/*tree borders */
#tree ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  position: relative;
}
#tree li {
  border-left: 2px solid #000;
  margin-left: 1em;
}
#tree .name {
  padding-left: 1em;
  position: relative;
}
#tree li .name::before {
  content:'';
  position: absolute;
  top: 0;
  left: -2px;
  bottom: 50%;
  width: 100%;
  border: 2px solid #000;
  border-top: 0 none transparent;
  border-right: 0 none transparent;
  z-index: -10;
}
#tree .channel {
  position: relative;
  background-color: white;
  font-weight: bold;
}
#tree .channel:first-child {
  margin-left: 5px;
}
#tree .channel.normal {
  font-weight: normal;
}

#tree .channel > span{
  background-color: white;
  padding: 0 5px;
}
#tree .channel.center {
  background-color: transparent;
  text-align: center;
}
#tree .channel.center > span::before {
  content: '';
  position: absolute;
  height: 19px;
  left: 50%;
  right: 0;
  background-color: white;
  z-index: -1;
}

#tree .channel.right {
  background-color: transparent;
  text-align: right;
}

#tree ul > li:first-child::before {
  content: '';
  position: absolute;
  top: calc(-0.5em - 3px);
  height: 19px;
  left: 1em;
  border-left: 2px solid #000;
}

#tree ul > li:last-child {
  border-left: 2px solid transparent;
}

/* graphs */
#graphs {
	grid-area: graphs;
	display: flex;
	flex-wrap: wrap;
	align-content: flex-start;
	align-items: stretch;
}
.demo-container {
	box-sizing: border-box;
	min-width: 100%;
	max-width: 100vw;
	height: 400px;
	padding: 20px 15px 15px 15px;
	margin: 0 auto 30px auto;
	border: 1px solid #ddd;
	background: #fff;
	background: linear-gradient(#f6f6f6 0, #fff 50px);
	box-shadow: 0 3px 10px rgba(0,0,0,0.15);

	user-select: none;
	flex-grow: 1;
}
.demo-placeholder {
	width: 100%;
	height: 100%;
	font-size: 14px;
}

@media (min-width: 600px) {
  .wrapper {
    grid-template-areas: 
		"header header"
		"tree settings"
		"tree graphs";
    grid-template-columns: 400px auto;
	  grid-template-rows: auto 50px auto;
  }
  .demo-container {
	  min-width: 850px;
  }
  #tree {
    margin-left: 10px;
  }
  #settings {
    margin-right: 10px;
  }
  #graphs {
    margin-right: 10px;
  }
}