html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  font-family: Arial, Helvetica, sans-serif;
  background: #000;
}

body {
  position: relative;
}

canvas {
  width: 100%;
  height: 100%;
  display: block;
}

#ui {
  position: absolute;
  left: 0;
  top: 0;
  width: 250px;
  height: 100%;
  background: rgba(0, 0, 0, 0.85);
  color: white;
  padding: 10px;
  box-sizing: border-box;
  overflow-y: auto;
  z-index: 10;
  backdrop-filter: blur(3px);
}

#title {
  font-weight: bold;
  margin-bottom: 10px;
  font-size: 20px;
}

#search {
  width: 100%;
  padding: 8px;
  margin-bottom: 10px;
  border: none;
  outline: none;
  box-sizing: border-box;
  background: #f5f5f5;
  color: #111;
  border-radius: 4px;
}

.section-title {
  margin: 12px 0 6px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #b0b0b0;
}

.item {
  padding: 8px 6px;
  cursor: pointer;
  border-bottom: 1px solid #444;
  user-select: none;
}

.item:hover {
  background: #333;
}

.item.active {
  background: #1f3f60;
}

.item.system-item {
  font-weight: bold;
}

.item.planet-item {
  padding-left: 18px;
}