body,
html {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  background-color: #333;
  color: #fff;
  font-family: monaco, Consolas, 'Roboto Mono', monospace;
}
* {
  outline: none;
  box-sizing: border-box;
}
.nav {
  display: none;
}
.nav * {
  display: inline-block;
}
button {
  background: none;
  border: none;
  color: #fff;
  font-size: 100%;
  font-family: inherit;
  cursor: pointer;
}
button.bottom {
  position: absolute;
  border-top: 1px solid #aaa;
  width: 100%;
  bottom: 0;
  padding: 10px;
}
button.bottom:hover {
  background-color: rgba(0,0,0,0.333);
}
.main {
  position: relative;
  width: 300px;
  height: 500px;
  background-color: #222;
  margin: auto;
}
.main .panel {
  transition-property: top, opacity;
  transition-duration: 1s;
  position: absolute;
  height: 100%;
  width: 100%;
  display: block;
  top: -100%;
  background-color: rgba(51,51,51,0.667);
}
.main .panel h3,
.main .panel h2 {
  text-align: center;
}
.main .panel[active] {
  top: 0;
  z-index: 10;
}
.main .panel[data-name=game] {
  overflow: hidden;
  z-index: 1;
}
.main .panel[data-name=gameover] ul {
  list-style: none;
  padding: 0;
}
.main .panel[data-name=gameover] ul li {
  text-align: center;
  margin: 20px 0;
}
.main .panel[data-name=gameover] ul li button {
  border-radius: 5px;
  padding: 5px;
}
.main .panel[data-name=gameover] ul li button:hover {
  background-color: rgba(255,255,255,0.2);
}
.main .panel[data-name=menu] ul {
  padding: 0;
  list-style: none;
  margin: 0;
  height: 100%;
}
.main .panel[data-name=menu] ul li {
  height: 33.33333333333334%;
  display: block;
  position: relative;
  display: table;
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}
.main .panel[data-name=menu] ul li:not(:last-of-type) {
  border-bottom: 1px solid #aaa;
}
.main .panel[data-name=menu] ul li button{
  padding: 0;
  width: 100%;
  height: 100%;
  display: block;
  text-align: center;
  /*display: table-cell;*/
  text-align: center;
  vertical-align: middle;
}
.main .panel[data-name=menu] ul li button:hover,
.main .panel[data-name=menu] ul li button:active,
.main .panel[data-name=menu] ul li button:focus {
  background-color: rgba(221,221,221,0.133);
}
.main .panel[data-name=settings] .reset-btn {
  width: 25px;
  height: 25px;
  vertical-align: bottom;
  float: right;
  cursor: pointer;
}
.point {
  width: 30px;
  height: 30px;
  display: block;
  position: absolute;
}
.point.blue {
  background-color: #008aff;
}
.point.red {
  background-color: #f00;
}
.wall {
  background-color: #aaa;
  position: absolute;
}
.score-bar {
  position: absolute;
  background-color: rgba(0,0,0,0.333);
  padding: 5px 0;
  width: 100%;
  text-align: center;
  z-index: 5;
}
input[type=checkbox] {
  position: absolute;
  top: -100%;
  left: -100%;
  opacity: 0;
}
span[data-type="checkbox"] {
  width: 20px;
  text-align: center;
  height: 20px;
  display: inline-block;
}
span[data-type="checkbox"]::after {
  content: "";
  display: inline-block;
  width: 5px;
  height: 5px;
  margin-right: 5px;
  margin-left: 5px;
  vertical-align: middle;
  border: 2px solid #fff;
  border-radius: 15px;
  transform: rotate(0);
  transition-property: border-radius, transform, width, height, margin-right, margin-left;
  transition-duration: 0.5s;
}
input[type=checkbox]:checked + label span[data-type="checkbox"]::after {
  content: "";
  border-right: none;
  border-top: none;
  border-radius: 0;
  transform: rotate(-45deg);
  width: 15px;
  height: 10px;
  background-color: transparent;
  margin-right: 2px;
  margin-left: 0;
}