html {
  font-family: "Helvetica Neue", Helvetica, sans-serif, "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei";
  font-size: 16px;
  line-height: 1.5;

  height: 100%;

  background-color: #f5f5f5;

  -webkit-tap-highlight-color: transparent;
}

::-webkit-scrollbar-track-piece {
  background-color: transparent;
}

::-webkit-scrollbar {
  width: 2px;
  height: 0px;
}

::-webkit-scrollbar-thumb {
  background-color: rgb(192, 199, 210);
  -webkit-border-radius: 7px;
}

::-webkit-scrollbar-thumb:hover {
  background-color: #9f9f9f;
}

::-webkit-scrollbar-arrow {
  color: #f00;
  backgound: #0f0;
}

body {
  overflow: hidden;

  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;

  background-image: url(../images/bg.jpg);
  background-repeat: no-repeat;
  background-position: center bottom;
  background-size: cover;
}

ul {
  margin: 0;
  padding: 0;
}

canvas#bg {
  position: fixed;
}

span.setup {
  position: absolute;
  z-index: 888;
  top: 10px;
  right: 10px;

  display: block;

  width: 32px;
  height: 32px;

  -webkit-transition: -webkit-transform 180ms ease;
  transition: -webkit-transform 180ms ease;
  transition: transform 180ms ease;
  transition: transform 180ms ease, -webkit-transform 180ms ease;

  border-radius: 50%;
  background-color: rgba(0, 0, 0, 0.3);
  background-image: url(../images/setup.svg);
  background-repeat: no-repeat;
  background-position: center;
  background-size: 24px;
}

span.setup.active {
  -webkit-transform: scale(0);
  transform: scale(0);
}

#menu {
  position: fixed;
  top: 50%;
  left: 50%;

  width: 240px;
  height: 240px;
  margin-top: -120px;
  margin-left: -120px;

  -webkit-transition: opacity 180ms ease-in;
  transition: opacity 180ms ease-in;
  -webkit-transform: rotate(45deg);
  transform: rotate(45deg);

  opacity: 0;
}

#menu .row {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;

  width: 100%;
  height: 80px;
}

#menu .col {
  width: 80px;
  height: 80px;

  text-align: center;

  -webkit-box-flex: 1;
  -ms-flex: 1;
  flex: 1;
}

#menu .icon {
  display: block;

  width: 40px;
  height: 40px;
  margin: 20px;

  cursor: pointer;
  -webkit-transform: rotate(-45deg);
  transform: rotate(-45deg);

  background-repeat: no-repeat;
  background-position: center;
  background-size: 40px;
}

#menu .icon-volume {
  background-image: url(../images/unmute.png);
  background-size: 36px;
}

#menu .icon-volume.muted {
  background-image: url(../images/mute.png);
}

#menu .icon-list {
  background-image: url(../images/menu.svg);
}

#menu .icon-timer {
  background-image: url(../images/timer.png);
}

#menu .icon-exit {
  background-image: url(../images/exit.svg);
  background-size: 36px;
}

#menu .icon-logo {
  width: 72px;
  height: 72px;
  margin: 4px;

  background-image: url(../images/logo.svg);
  background-size: 72px;
}

#menu .icon-timer.active {
  display: none;
}

.line-group > div {
  position: absolute;

  width: 240px;
  height: 1px;

  -webkit-transition: -webkit-transform 200ms ease-in;
  transition: -webkit-transform 200ms ease-in;
  transition: transform 200ms ease-in;
  transition: transform 200ms ease-in, -webkit-transform 200ms ease-in;
  -webkit-transition-delay: 180ms;
  transition-delay: 180ms;

  background-color: #fff;
}

.line-1 {
  top: 80px;

  -webkit-transform: translateX(200px);
  transform: translateX(200px);
}

.line-2 {
  top: 160px;

  -webkit-transform: translateX(-200px);
  transform: translateX(-200px);
}

.line-3 {
  top: 120px;
  left: -40px;

  -webkit-transform: rotate(90deg) translateX(-200px);
  transform: rotate(90deg) translateX(-200px);
}

.line-4 {
  top: 120px;
  left: 40px;

  -webkit-transform: rotate(90deg) translateX(200px);
  transform: rotate(90deg) translateX(200px);
}

#menu.visible {
  opacity: 1;
}

#menu.visible .line-1 {
  -webkit-transform: translateX(0);
  transform: translateX(0);
}

#menu.visible .line-2 {
  -webkit-transform: translateX(0);
  transform: translateX(0);
}

#menu.visible .line-3 {
  -webkit-transform: rotate(90deg) translateX(0);
  transform: rotate(90deg) translateX(0);
}

#menu.visible .line-4 {
  -webkit-transform: rotate(90deg) translateX(0);
  transform: rotate(90deg) translateX(0);
}

section.side-bar {
  position: fixed;
  z-index: 999;

  overflow: hidden;

  width: 100%;
  height: 100%;

  -webkit-transition: -webkit-transform 480ms ease;
  transition: -webkit-transform 480ms ease;
  transition: transform 480ms ease;
  transition: transform 480ms ease, -webkit-transform 480ms ease;
  -webkit-transition-delay: 180ms;
  transition-delay: 180ms;
  -webkit-transform: translateX(100%);
  transform: translateX(100%);
}

.mask {
  position: absolute;
  top: 0;
  left: 0;

  width: 100%;
  height: 100%;

  background-color: transparent;
}

#sound-list {
  position: absolute;
  z-index: 2;
  right: 0;

  overflow: scroll;

  width: 240px;
  height: 100%;

  background-color: rgba(0, 0, 0, 0.2);

  -webkit-overflow-scrolling: touch;
}

#sound-list li {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;

  width: 100%;
  height: 80px;
  margin: 0;
  padding: 0;

  list-style: none;

  opacity: 0.6;
}

#sound-list .icon {
  display: inline-block;

  width: 60px;
  height: 60px;
  margin: 10px;

  cursor: pointer;

  background-image: url(../images/icon-sprite.png);
  background-repeat: no-repeat;
  background-size: 720px 60px;
}

.icon-rain {
  background-position: 0 0;
}

.icon-thunder {
  background-position: -540px 0;
}

.icon-farm {
  background-position: -660px 0;
}

.icon-night {
  background-position: -360px 0;
}

.icon-forest {
  background-position: -60px 0;
}

.icon-leaves {
  background-position: -120px 0;
}

.icon-river {
  background-position: -180px 0;
}

.icon-fire {
  background-position: -240px 0;
}

.icon-seaside {
  background-position: -600px 0;
}

.icon-yacht {
  background-position: -420px 0;
}

.icon-coffee {
  background-position: -300px 0;
}

.icon-train {
  background-position: -480px 0;
}

.sound-icon {
  width: 80px;
  height: 80px;

  -webkit-box-flex: 4;
  -ms-flex: 4;
  flex: 4;
}

.control-block {
  width: 140px;
  height: 60px;
  padding: 10px;

  -webkit-box-flex: 7;
  -ms-flex: 7;
  flex: 7;
}

.control-block h4 {
  font-size: 18px;
  font-weight: normal;

  margin-top: 0;
  margin-bottom: 0;

  -webkit-transition: -webkit-transform 300ms ease;
  transition: -webkit-transform 300ms ease;
  transition: transform 300ms ease;
  transition: transform 300ms ease, -webkit-transform 300ms ease;
  -webkit-transform: translateY(18px);
  transform: translateY(18px);

  color: #fff;
}

.control-block h4 small {
  margin-left: 10px;
}

.control-bar {
  position: relative;

  display: none;

  width: 100%;
  height: 4px;
  margin-top: 12px;

  border-radius: 2px;
  background-color: #fff;
}

.control-bar:before,
.control-bar:after {
  position: absolute;
  z-index: 2;
  top: -15px;
  left: 0;

  display: block;

  width: 100%;
  height: 15px;

  content: "";
}
.control-bar:after {
  top: 0;

  height: 20px;
}

.slider {
  position: absolute;
  z-index: 8;
  left: 0;

  display: block;

  width: 14px;
  height: 14px;
  margin-top: -5px;
  margin-left: -7px;

  cursor: pointer;

  border-radius: 50%;
  background-color: #fff;
}

#sound-list li.active {
  opacity: 1;
}

section.side-bar.visible {
  -webkit-transform: translateX(0);
  transform: translateX(0);
}

section.side-bar.visible #sound-list {
  -webkit-transform: translateX(0);
  transform: translateX(0);
}

.timer {
  font-size: 24px;

  position: relative;
  top: 20px;

  display: none;

  -webkit-transform: rotate(-45deg);
  transform: rotate(-45deg);
  text-align: center;

  color: #fff;
}

.timer.visible {
  display: block;

  opacity: 0.8;
}

@media (min-width: 980px) {
  #sound-list li.active h4 {
    margin-top: 0;

    -webkit-transform: translateY(0);
    transform: translateY(0);
  }

  #sound-list li.active .control-bar {
    display: block;
  }
}