body {
  background-color: #5b0085;
}

.feature {
  padding-top: 130px;
  padding-bottom: 430px;
  display: flex;
  color: #fff;
  width: 1440px;
  margin: auto;
}

.feature .nav {
  font-size: 25px;
  width: 280px;
}

.feature .nav .nav_box {
  width: 100%;
  height: auto;
}

.feature .nav > ul > li {
  cursor: pointer;
  width: 100%;
  line-height: 1;
  padding: 18px 29px;
  box-sizing: border-box;
  height: 69px;
  position: relative;
}

.feature .nav > ul > li + li {
  margin-top: 15px;
}

.feature .nav > ul > li.active {
  /* background-color: #fff; */
  color: #300146;
  font-size: 33px;
  border-radius: 10px;
}

.feature .nav > ul > li::after {
  display: block;
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 69px;
  border-radius: 10px;
  z-index: -1;
  transform: translate(-100px, 0);
  transition: all 0.4s linear;
}

.feature .nav > ul > li.active::after {
  left: 0;
  background-color: #fff;
  transform: translate(0, 0);
}

.feature .separator {
  width: 4px;
  background: #ffffff;
  margin: 0 122px 0 83px;
}

.feature .sep_content {
  font-size: 16px;
  line-height: 44px;
  flex: 1;
  /* overflow: hidden; */
  position: relative;
}

.feature .sep_content .content-text {
  transition: all 0.4s linear;
  transform: translate(-200px, 0);
  opacity: 0;
  /* position: absolute; */
  top: 0;
  left: 0;
}

.feature .sep_content .content-text p {
  text-indent: 2em;
}

.feature .sep_content .content-text img,
.feature .sep_content .content-text p img {
  width: 100%;
  height: auto;
}

.feature .sep_content .content-text.active {
  opacity: 1;
  transform: translate(0, 0);
}

.active:hover {
  color: inherit;
}

@media (min-width: 1200px) and (max-width: 1530px) {
  .feature {
    width: 1100px;
    margin: auto;
  }
}

@media (min-width: 769px) and (max-width: 1199px) {
  .feature {
    width: 900px;
  }

  .feature .separator {
    margin: 0 64px 0 48px;
  }
}

@media (width: 640px) {
  .feature {
    width: 100%;
    box-sizing: border-box;
    padding: 0 30px;
    padding-top: 1.3rem;
  }

  .banner-text > p:nth-of-type(1) {
    font-size: 50px;
    line-height: 1.5;
  }

  .banner-text > p:nth-of-type(2) {
    font-size: 0.43rem;
    font-weight: bold;
    color: #ffffff;
    line-height: 0.65rem;
    text-shadow: 0px 10px 21px rgba(37, 37, 37, 0.65);
  }

  .feature .nav > ul > li.active {
    font-size: 24px;
  }

  .feature .nav {
    font-size: 18px;
    width: 180px;
  }

  .feature .nav {
    font-size: 16px;
  }

  .feature .nav > ul > li {
    padding: 0 29px;
    height: 32px;
    line-height: 32px;
  }

  .feature .nav > ul > li.active {
    height: 52px;
    line-height: 52px;
    font-size: 16px;
  }
  .feature .nav > ul > li::after {
    height: 52px;
  }

  .feature .separator {
    margin: 0 60px 0 20px;
  }

  .feature .sep_content {
    font-size: 17px;
    line-height: 32px;
  }
}