style.scss

@import url(https://fonts.googleapis.com/css?family=Roboto:400,300);

* {
  box-sizing: border-box;
}

$color-dark: rgba(#000, 0.9);
$color-light: rgba(#fff, 0.8);

$color-primary: #37474F;
$color-secondary: #009688;
$color-secondary-shade: #00796B;

body {
  -webkit-tap-highlight-color: rgba(0,0,0,0);
  align-items: flex-start;
  background-color: #D7CCC8;
  color: $color-light;
  display: flex;
  font-family: Roboto, Arial, sans-serif;
  font-size: 16px;
  justify-content: center;
  line-height: 24px;
  margin-top: 96px;

  & > div {
    box-shadow: 1px 1px 2px 1px rgba(#000, 0.2);
  }
}

[ng-click] {
  cursor: pointer;
}

.player-cover {
  img {
    max-width: 400px;
  }
}

.player {
  align-self: flex-start;
  background: $color-primary;
  box-shadow: inset 0 1px 1px 0 #546E7A;
  min-height: 120px;
  min-width: 340px;
  padding: 24px 48px;
  position: relative;
}

.player-main {
  position: relative;
}

.player-progress {
  background: $color-secondary-shade;
  bottom: 100%;
  height: 0;
  left: 0;
  position: absolute;
  right: 0;
  transition: all 300ms ease-out;
}

.player-progress-bar {
  background: #FAFAFA;
  height: 100%;
}

.player-progress-cursor {
  background: rgba(#fff, 0.5);
  border-radius: 50%;
  box-shadow: 0 0 0 8px rgba(#fff, 0.5);
  cursor: -webkit-grab;
  height: 8px;
  position: absolute;
  top: 1px;
  transform: scale(0);
  transition: all 100ms ease-out;
  width: 8px;
  z-index: 1;
}

.player-title {
  transform: translateY(0);
  transition: all 500ms ease-out;
  opacity: 1;
}

.player-footer {
  background: #FAFAFA;
  color: $color-dark;
  display: block;
  height: 60px;
  overflow: hidden;
  position: relative;
}

.player-footer-slider {
  transform: translateY(-60px);
  transition: all 500ms ease-out;
}

.player-footer-face {
  padding: 18px 48px;
  position: relative;
  transition: all 300ms ease-out;

  &:first-of-type {
    background-color: $color-primary;
    color: transparent;
  }

  &:last-of-type:before {
    box-shadow: 0 0 2px 1px rgba(0, 0, 0, 0.4);
    content: '';
    height: 0;
    left: 0;
    position: absolute;
    top: 0;
    width: 100%;
  }
}

.player-footer-title {
  margin-left: 4px;
}

$size: 80px;
$margin-right: 32px;

.playing {

  .player-progress {
    transition: all 300ms ease-out;
    height: 4px;

    &:hover,
    &:active {
      height: 12px;

      .player-progress-cursor {
        transform: scale(1);
      }
    }
  }

  .player-controls-container {
    animation-duration: 500ms;
    animation-name: moving;
  }

  .player-controls-background {
    animation-duration: 500ms;
    animation-name: morphing;
  }

  .player-controls {
    height: 120px;
    left: -400px/2 + $size/2;
    top: -120px/2 + $size/2;
    width: 400px;
  }

  .player-title {
    transform: translateY(30px);
    opacity: 0;
  }

  .player-footer-slider {
    transform: translateY(0px);
  }

  .player-footer-face {
    transition-delay: 200ms;

    &:first-of-type {
      color: $color-light;
    }

    &:last-of-type {
      color: transparent;
    }

    .icon-equalizer,
    .icon-equalizer:after,
    .icon-equalizer:before {
      animation-name: rise;
      background-color: $color-light;
    }
  }
}

.player-controls-container {
  animation-duration: 400ms;
  animation-fill-mode: forwards;
  animation-name: unmoving;
  animation-timing-function: ease-in;
  bottom: calc(100% - #{$size/2});
  color: $color-light;
  left: calc(100% - #{$size} - #{$margin-right});
  position: absolute;
  right: $margin-right;
  top: -$size/2;
}

.player-controls-background {
  animation-duration: 400ms;
  animation-fill-mode: forwards;
  animation-name: unmorphing;
  animation-timing-function: ease-in;
  background-color: $color-secondary;
  border-radius: 50%;
  box-shadow: 0px 2px 2px 2px rgba(0, 0, 0, 0.1);
  content: '';
  display: inline-block;
  height: $size;
  width: $size;
}

.player-controls {
  align-items: center;
  bottom: 0;
  display: flex;
  height: $size;
  justify-content: center;
  left: 0;
  line-height: $size;
  position: absolute;
  right: 0;
  text-align: center;
  top: 0;
  width: $size;
}

.player-controls-time {
  color: rgba(#fff, 0.4);
  font-size: 12px;
  font-weight: 400;
  height: 18px;
  line-height: 18px;
  margin: auto;
  position: absolute;
  right: 8px;
  top: 4px;

  em {
    color: $color-light;
  }
}

.player-control {
  border-radius: 50%;
  display: inline-block;
  font-size: $size / 2.2;
  height: $size;
  line-height: $size;
  transition: background 300ms ease-out;
  width: $size;

  &:active {
    background: rgba(#000, 0.1);
  }
}

@keyframes moving {

  0% {
    bottom: calc(100% - #{$size/2});
    left: calc(100% - #{$size} - #{$margin-right});
    right: 0;
    top: -$size/2;
  }

  30% {
    bottom: calc(50% - #{$size/2});
    top: calc(50% - #{$size/2});
  }

  50% {
    left: calc(50% - #{$size/2});
    right: calc(50% - #{$size/2});
  }

  100% {
    left: calc(50% - #{$size/2});
    right: calc(50% - #{$size/2});
    bottom: calc(50% - #{$size/2});
    top: calc(50% - #{$size/2});
  }
}

@keyframes morphing {

  0% {
    transform: scale(1);
  }

  60% {
    transform: scale(2);
  }

  80% {
    transform: scale(8);
  }

  100% {
    transform: scale(8);
  }
}

@keyframes unmoving {

  0% {
    bottom: calc(50% - #{$size/2});
    left: calc(50% - #{$size/2});
    right: calc(50% - #{$size/2});
    top: calc(50% - #{$size/2});
  }

  50% {
    bottom: calc(50% - #{$size/2});
    left: calc(50% - #{$size/2});
    right: calc(50% - #{$size/2});
    top: calc(50% - #{$size/2});
  }

  80% {
    left: calc(100% - #{$size} - #{$margin-right});
    right: 0;
  }

  100% {
    bottom: calc(100% - #{$size/2});
    top: -$size/2;
  }
}

@keyframes unmorphing {

  0% {
    transform: scale(8);
  }

  50% {
    transform: scale(2);
  }

  100% {
    transform: scale(1);
  }
}

.fade-in {
  opacity: 1;
  transform: translateX(0);
  transition:
    opacity 400ms ease-in 150ms,
    transform 400ms ease-in 100ms,
    background 300ms ease-out;

  &.ng-hide {
    transition: none;
    opacity: 0;
  }

  &.left.ng-hide {
    transform: translateX(30px);
  }

  &.right.ng-hide {
    transform: translateX(-30px);
  }
}

h1,
h2 {
  font-weight: 400;
  margin: 0;
  line-height: 1.5;
}

h1 {
  font-size: 24px;
  font-weight: 400;
  line-height: 1.5;
}

h2 {
  font-size: 28px;
  font-weight: 300;
}

em {
  font-weight: 300;
  font-style: normal;
}

@mixin icon-equalizer-bar {
  animation-direction: alternate;
  animation-duration: 400ms;
  animation-iteration-count: infinite;
  animation-name: none;
  animation-timing-function: linear;
  background-color: transparent;
  bottom: 0;
  display: inline-block;
  height: 2px;
  transition: background 1000ms ease-out;
  width: 3px;
}

.icon-equalizer {
  @include icon-equalizer-bar();
  bottom: 24px;
  position: absolute;
  right: 48px;

  &:after,
  &:before {
    @include icon-equalizer-bar();
    content: '';
    position: absolute;
  }

  &:after {
    animation-duration: 800ms;
    left: 4px;
  }

  &:before {
    animation-duration: 600ms;
    right: 4px;
  }
}

@keyframes rise {

  0% {
    height: 8px;
  }

  100% {
    height: 14px;
  }
}