//动画特效
.container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
}

.btn-82,
.btn-82 *,
.btn-82 :after,
.btn-82 :before,
.btn-82:after,
.btn-82:before {
  border: 0 solid;
  box-sizing: border-box;
}

.btn-82 {
  -webkit-tap-highlight-color: transparent;
  -webkit-appearance: button;
  background-color: darkgreen;
  background-image: none;
  color: pink;
  cursor: pointer;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
  Segoe UI, Roboto, Helvetica Neue, Arial, Noto Sans, sans-serif,
  Apple Color Emoji, Segoe UI Emoji, Segoe UI Symbol, Noto Color Emoji;
  font-size: 100%;
  font-weight: 900;
  line-height: 1.5;
  margin: 0;
  -webkit-mask-image: -webkit-radial-gradient(#000, #fff);
  padding: 0;
}

.btn-82:disabled {
  cursor: default;
}

.btn-82:-moz-focusring {
  outline: auto;
}

.btn-82 svg {
  display: block;
  vertical-align: middle;
}

.btn-82 [hidden] {
  display: none;
}

.btn-82 {
  background: none;
  border-radius: 999px;
  box-sizing: border-box;
  display: block;
  overflow: hidden;
  padding: 1.2rem 3rem;
  position: relative;
  text-transform: uppercase;
}

.btn-82 span {
  font-weight: 900;
  mix-blend-mode: difference;
  transition: opacity 0.2s;
}

.btn-82:hover span {
  -webkit-animation: text-reset 0.2s 0.8s forwards;
  animation: text-reset 0.2s 0.8s forwards;
  opacity: 0;
}

.btn-82:after,
.btn-82:before {
  border: 4px solid #fff;
  border-radius: 999px;
  content: "";
  height: 100%;
  left: 0;
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  transition: height 0.2s;
  width: 100%;
}

.btn-82:after {
  background: darkgreen;
  border: none;
  height: 2rem;
  width: 0;
  z-index: -1;
}

.btn-82:hover:before {
  -webkit-animation: border-reset 0.2s linear 0.78s forwards;
  animation: border-reset 0.2s linear 0.78s forwards;
  height: 2rem;
}

.btn-82:hover:after {
  -webkit-animation: progress-bar 1s;
  animation: progress-bar 1s;
}

@-webkit-keyframes progress-bar {
  0% {
    opacity: 1;
    width: 0;
  }
  10% {
    opacity: 1;
    width: 15%;
  }
  25% {
    opacity: 1;
    width: 25%;
  }
  40% {
    opacity: 1;
    width: 35%;
  }
  55% {
    opacity: 1;
    width: 75%;
  }
  60% {
    opacity: 1;
    width: 100%;
  }
  to {
    opacity: 0;
    width: 100%;
  }
}

@keyframes progress-bar {
  0% {
    opacity: 1;
    width: 0;
  }
  10% {
    opacity: 1;
    width: 15%;
  }
  25% {
    opacity: 1;
    width: 25%;
  }
  40% {
    opacity: 1;
    width: 35%;
  }
  55% {
    opacity: 1;
    width: 75%;
  }
  60% {
    opacity: 1;
    width: 100%;
  }
  to {
    opacity: 0;
    width: 100%;
  }
}

@-webkit-keyframes border-reset {
  0% {
    height: 2rem !important;
  }
  to {
    height: 100% !important;
  }
}

@keyframes border-reset {
  0% {
    height: 2rem !important;
  }
  to {
    height: 100% !important;
  }
}

@-webkit-keyframes text-reset {
  0% {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes text-reset {
  0% {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}