html {
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  margin: 0;
  font-weight: 300;
}

.song {
  visibility: hidden;
}

.container {
  height: 100vh;
  margin: 0 auto;
  overflow: hidden;
  position: relative;
  text-align: center;
  visibility: hidden;
  width: 100vw;
}

.container>div {
  left: 0;
  position: absolute;
  right: 0;
  top: 20vh;
}

.one {
  font-size: 4.5rem;
  font-weight: 200;
    letter-spacing: -0.02em;
}

.two {
  font-size: 1.2rem;
  font-weight: 300;
    letter-spacing: -0.01em;
}

.three {
  font-size: 3rem;
  font-weight: 300;
    letter-spacing: -0.015em;
}

.four .text-box {
  border: 3px solid #aaa;
  border-radius: 5px;
  margin: 0 auto;
  padding: 10px;
  position: relative;
  width: 600px;
}

.text-box p {
  margin: 0;
  text-align: left;
}

.text-box span {
  visibility: hidden;
}

.text-box .fake-btn {
  background-color: #03C160;
  border-radius: 3px;
  bottom: -50px;
  color: #fff;
  padding: .5rem 1rem;
  position: absolute;
  right: 0px;
    font-weight: 400;
    letter-spacing: -0.005em;
}

.five p {
  font-size: 2rem;
  left: 0;
  position: absolute;
  right: 0;
}

.idea-3 strong {
  border-radius: 3px;
  display: inline-block;
  padding: 3px 5px;
}

.five .idea-5 {
  font-size: 3rem;
}

.idea-5 span,
.idea-6 span,
.wish-hbd span {
  display: inline-block;
}

.idea-6 span {
  font-size: 15rem;
}


.six {
  position: relative;
  top: 10vh;
  z-index: 1;
}

.six img {
  display: inline-block;
  height: 350px;
  max-width: 100%;
  /* height: auto; */
}

.baloons img {
  display: inline-block;
  position: absolute;
}

.baloons img:nth-child(even) {
  left: -10%;
}

.baloons img:nth-child(odd) {
  right: -10%;
}

.baloons img:nth-child(3n + 0) {
  left: 30%;
}

.seven,
.eight {
  height: 100vh;
  position: fixed;
  top: 0;
  width: 100vw;
}

.eight svg {
  left: 0;
  position: absolute;
  top: 0;
  visibility: hidden;
  width: 25px;
  z-index: -1;
}

.eight svg:nth-child(1) {
  fill: #bd6ecf;
  left: 5vw;
  top: 7vh;
}

.eight svg:nth-child(2) {
  fill: #5fcdeb;
  left: 35vw;
  top: 23vh;
}

.eight svg:nth-child(3) {
  fill: #ecffa7;
  left: 23vw;
  top: 33vh;
}


.wish-hbd {
  font-size: 3em;
  margin: 0;
  text-transform: uppercase;
}

.wish h5 {
  font-size: 2rem;
  font-weight: 300;
    letter-spacing: -0.01em;
  margin: 10px 0 0;
}

.nine p {
  font-size: 0.5rem;
    font-weight: 200;
    letter-spacing: -0.01em;
}

#replay {
  cursor: pointer;
  z-index: 3;
}


@media screen and (max-width: 500px) {
  .container {
    width: 90%;
  }

  .four .text-box {
    width: 90%;
  }

  .text-box .fake-btn {
    bottom: -50px;
      right: 0px;
  }

  .idea-5 span {
    display: block;
  }

  .idea-6 span {
    font-size: 10rem;
  }

  .wish-hbd {
    font-size: 2.2em;
  }

  .wish h5 {
    font-size: 1.4rem;
  }

  .nine p {
    font-size: 1.2rem;
      font-weight: 300;
    }
    }
    
    .play-pause {
      width: 50px;
      height: 50px;
      background-size: contain;
      background-repeat: no-repeat;
      background-image: url('../img/play.svg');
      background-color: transparent;
      border: none;
      cursor: pointer;
      z-index: 100;
    
      position: absolute;
      right: 5vw;
      top: 5vh;
      transition: all 0.3s ease-in-out;
    }
    
    .play-pause.playing {
      background-image: url('../img/pause.svg');
      animation: rotate 2s linear infinite;
    }
    
    .startSign {
      /* 居中 */
      display: flex;
      justify-content: center;
      align-items: center;
      flex-direction: column;
      margin: 20vh 5vw;
    }
.startSign .button {
  padding: 1rem 1.6rem;
  border: 1px solid #03C160;
  border-radius: 5px;
  font-weight: 400;
  letter-spacing: -0.005em;
}

.startSign .button:hover {
  background-color: #03C160;
  color: #fff;
  padding: 1rem 1.6rem;
  cursor: pointer;
}