* {
  margin: 0px;
  padding: 0px;
  box-sizing: border-box;
  border: 0px;
  outline: 0;
  background-repeat: no-repeat;
  appearance: none;
  border-radius: 0;
  font-weight: inherit;
  font-style: inherit;
  font-family: inherit;
  text-decoration: none;
  list-style: none;
  user-select: text;
}

@keyframes rotate {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}
@keyframes ufo {
  0% {
    transform: translateX(50vw);
  }
  70% {
    transform: translateX(100vw);
  }
  90% {
    transform: translateX(100vw);
  }
  100% {
    transform: translateX(200vw);
  }
}
@keyframes rotate-z {
  0% {
    transform: translateX(-2.5vh);
  }
  100% {
    transform: translateX(2.5vh);
  }
}
@keyframes orbiting {
  0% {
    z-index: 3;
    top: 0;
    right: 100%;
    bottom: 100%;
    left: 0;
    transform: scale(1);
  }
  25% {
    z-index: 3;
    top: 50%;
    right: 50%;
    bottom: 50%;
    left: 50%;
    transform: scale(2);
  }
  50% {
    z-index: 1;
    top: 100%;
    right: 0;
    bottom: 0;
    left: 100%;
    transform: scale(1) translate(-100%, -100%);
  }
  75% {
    z-index: 1;
    top: 50%;
    right: 50%;
    bottom: 50%;
    left: 50%;
    transform: scale(0.5);
  }
  100% {
    z-index: 1;
    top: 0;
    right: 100%;
    bottom: 100%;
    left: 0;
    transform: scale(1);
  }
}
@keyframes orbiting-iss {
  0% {
    z-index: 3;
    top: 0;
    right: 0;
    bottom: 100%;
    left: 100%;
    transform: scale(1);
  }
  25% {
    z-index: 3;
    top: 50%;
    right: 50%;
    bottom: 50%;
    left: 50%;
    transform: scale(2);
  }
  50% {
    z-index: 1;
    top: 100%;
    right: 100%;
    bottom: 0;
    left: 0;
    transform: scale(1) translate(-100%, -100%);
  }
  75% {
    z-index: 1;
    top: 50%;
    right: 50%;
    bottom: 50%;
    left: 50%;
    transform: scale(0.5);
  }
  100% {
    z-index: 1;
    top: 0;
    right: 0;
    bottom: 100%;
    left: 100%;
    transform: scale(1);
  }
}
body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  margin: 0;
  height: 100vh;
  max-width: 100vw;
  overflow: hidden;
}

#container {
  margin: 0;
  height: 100vh;
  width: 100vw;
  background-color: #202;
  background: radial-gradient(#002 40%, #001 100%);
}

#comet-route {
  position: relative;
  z-index: 100;
  top: 25%;
  left: -50%;
  width: 200vh;
  min-width: 200vw;
  height: 1vh;
  animation: rotate 240s linear 0s infinite;
}
#comet-route #comet {
  width: 1vh;
  height: 1vh;
  background-color: #02bc70;
  filter: drop-shadow(8px 0 12px #02bc70);
  border-radius: 50%;
}
#comet-route #comet.fire {
  transition: 1s ease;
  transform: translateX(200vw);
}
#comet-route #comet:after {
  content: "";
  display: block;
  width: 20vh;
  height: 1vh;
  background: linear-gradient(90deg, transparent, rgba(2, 188, 112, 0.9));
  transform: translateX(calc(-100% + 0.5vh));
}

#ufo-route {
  position: absolute;
  z-index: 100;
  top: 25%;
  left: -50%;
  width: 200vh;
  min-width: 200vw;
  height: 1vh;
  animation: rotate 6s reverse 0s infinite;
}
#ufo-route #ufo {
  position: relative;
  font-size: 2vh;
  width: 1vh;
  height: 1vh;
  filter: drop-shadow(0px -3px 12px #02bc70);
  border-radius: 50%;
}
#ufo-route #ufo.fire {
  animation: ufo 10s linear 0s infinite;
}

.backgroundstars {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 2px;
  height: 2px;
  background-color: #eaeaea;
  transition: 1s ease;
  will-change: transform;
}
.backgroundstars.blink {
  transform: translate(-50%, -50%) scale(2);
  filter: drop-shadow(0 0 3px white);
}

.star, .planet, .moon {
  border-radius: 50%;
}

#sun {
  position: absolute;
  top: 0;
  right: 0;
  transform: translate(50%, -50%);
  height: 50vh;
  max-height: 50vw;
  width: 50vh;
  max-width: 50vw;
  background: radial-gradient(#ffff32, #dcb419);
  filter: drop-shadow(0 0 10vh #ffb478) drop-shadow(0 0 2.5vh #dcb419);
}

#mercury {
  position: absolute;
  z-index: 10;
  top: 20%;
  right: 20%;
  transform: translate(-50%, -50%);
  height: 2vh;
  max-height: 2vw;
  width: 2vh;
  max-width: 2vw;
  background: radial-gradient(#333, #444);
  filter: drop-shadow(0 0 2vh #fff) drop-shadow(0 0 1vh #fff);
}

#venus {
  position: absolute;
  top: 30%;
  right: 25%;
  transform: translate(-50%, -50%);
  height: 6vh;
  max-height: 6vw;
  width: 6vh;
  max-width: 6vw;
  background: radial-gradient(#de8438, #8f481c);
  filter: drop-shadow(0 0 10vh #de8438) drop-shadow(0 0 2.5vh #8f481c);
  animation: rotate 120s linear 0s infinite;
  overflow: hidden;
}
#venus .cloud {
  position: absolute;
  top: 20%;
  left: -20%;
  height: 1.25vh;
  max-height: 1.25vw;
  width: 5vh;
  max-width: 5vw;
  background: rgba(120, 20, 40, 0.2);
  border-radius: 50%;
}
#venus .cloud:first-child {
  top: 45%;
  left: 50%;
}
#venus .cloud:last-child {
  top: 70%;
}

.orbit {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  justify-content: center;
  align-items: center;
  height: 30vh;
  max-height: 30vw;
  width: 30vh;
  max-width: 30vw;
  transition: 2.5s ease;
}
.orbit.fire {
  filter: brightness(50);
}
.orbit.explode {
  transition: 2.5s ease;
  filter: brightness(100);
}
.orbit.done {
  opacity: 0;
  filter: brightness(0);
}
.orbit #earth {
  z-index: 2;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 66.666%;
  width: 66.666%;
  box-shadow: 0 0 2vh rgba(255, 255, 255, 0.2);
  filter: drop-shadow(0 0 10vh #1180f3) drop-shadow(0 0 2.5vh #1d54e2);
  overflow: hidden;
  background: radial-gradient(#207AF0, #1f52e3);
  animation: rotate 240s linear 0s infinite;
}
.orbit #earth .land {
  font-size: 25vh;
  color: rgba(80, 220, 40, 0.5);
}
.orbit #moon {
  position: absolute;
  z-index: 3;
  height: 3vh;
  max-height: 3vw;
  width: 3vh;
  max-width: 3vw;
  background: radial-gradient(#fff, #eaeaea);
  border: 1px solid #fff;
  filter: drop-shadow(0 0 1vh #fff);
  animation: orbiting 30s linear 0s infinite, rotate 10s linear 0s infinite;
  overflow: hidden;
}
.orbit #moon:after {
  content: "";
  position: absolute;
  top: 10%;
  left: 10%;
  height: 1vh;
  max-height: 1vw;
  width: 1vh;
  max-width: 1vw;
  background: radial-gradient(#333, #aaa);
  border-radius: 50%;
  animation: rotate-z 5s linear 0s infinite;
}
.orbit #moon:before {
  content: "";
  position: absolute;
  top: 50%;
  left: 30%;
  height: 0.5vh;
  max-height: 0.5vw;
  width: 0.5vh;
  max-width: 0.5vw;
  background: radial-gradient(#333, #aaa);
  border-radius: 50%;
  animation: rotate-z 5s linear 0s infinite;
}
.orbit #iss {
  position: absolute;
  z-index: 3;
  height: 0.125vh;
  max-height: 0.125vw;
  width: 0.125vh;
  max-width: 0.125vw;
  background: radial-gradient(#fff, #eaeaea);
  filter: drop-shadow(0 0 1vh #fff);
  animation: orbiting-iss 2s linear 0s infinite;
}

#nav {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  justify-content: space-around;
  width: 25vh;
  max-width: 25vw;
  height: 5vh;
  max-height: 5vw;
}
#nav button {
  width: 5vh;
  font-size: 2.5vh;
  border-radius: 50%;
  transition: 0.4s ease;
  background-color: #ffffff;
  filter: drop-shadow(0 0 10px #909);
}
#nav button:hover, #nav button:active {
  cursor: pointer;
  transform: scale(1.1);
}

.reference {
  position: absolute;
  right: 24px;
  bottom: 24px;
  color: #fff;
  font-family: arial;
  text-decoration: none;
}