* {
  margin: 0;
  padding: 0;
}

.banner {
  max-height: 1080px;
  height: 100vh;
  width: 100%;
  overflow: hidden;
}

.banner .swiper-slide {
  position: relative;
}

.banner .b_img {
  width: 100%;
  height: 100%;
  overflow: hidden;
  position: relative;
}

.banner .b_img img {
  position: absolute;
  /* left: 50%; */
  /* top: 50%; */
  width: 100%;
  height: 100%;
  object-fit: cover;
  /* transform: translate(-50%, -50%) scale(1.2); */
  transform: scale(1.2);
  transition: all ease 1.5s;
  -webkit-transition: all ease 1.5s;
  -moz-transition: all ease 1.5s;
  -ms-transition: all ease 1.5s;
  -o-transition: all ease 1.5s;
}

.banner .b_text {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 20px;
  color: #fff;
  display: flex;
}

.banner .b_wrapper {
  width: 90%;
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.banner .b_text .b_btitle,
.banner .b_text .b_btitle1,
.banner .b_text .b_summary {
  line-height: 1.3;
  opacity: 0;
  transform: translateY(40px);
}

.banner .b_text .b_btitle1 {
  font-size: 32px;
  transition: all ease .8s .9s;
  font-weight: normal;
}

.banner .b_text .b_btitle {
  font-size: 64px;
  transition: all ease .8s .6s;
  font-weight: bold;
}

.banner .b_text .b_summary {
  font-size: 24px;
  line-height: 1.6;
  margin-bottom: 30px;
  transition: all ease .8s .3s;
}

.banner .swiper-slide-active .b_text .b_btitle,
.banner .swiper-slide-active .b_text .b_btitle1,
.banner .swiper-slide-active .b_text .b_summary {
  opacity: 1;
  transform: translateY(0);
}

.banner .swiper-slide-active .b_img img {
  /* transform: translate(-50%, -50%) scale(1); */
  transform: scale(1);
}

.banner .swiper-pagination .swiper-pagination-bullet {
  width: 12px;
  height: 12px;
  border-radius: 6px;
  transition: all .5s;
  background: #fff;
  opacity: .5;
}

.banner .swiper-pagination .swiper-pagination-bullet.swiper-pagination-bullet-active {
  transition: all .5s;
  opacity: 1;
  width: 30px;
}

.banner .b_scrool {
  position: absolute;
  left: 20px;
  bottom: 40px;
  color: #fff;
  z-index: 10;
}

.banner .b_scrool span {
  text-transform: uppercase;
  color: #fff;
  display: block;
  font-family: arial;
  writing-mode: tb;
  line-height: 20px;
  margin-bottom: 12px;
  font-size: 12px;
}

.banner .b_scrool i {
  display: block;
  width: 20px;
  height: 30px;
  border-radius: 12px;
  border: 2px #fff solid;
  position: relative;
}

.banner .b_scrool i:before {
  content: "";
  display: block;
  width: 4px;
  height: 10px;
  background: #fff;
  border-radius: 2px;
  position: absolute;
  left: 50%;
  top: 3px;
  transform: translate(-50%, 0);
  animation: scrollmouse 2s linear infinite;
}

@keyframes scrollmouse {
  from {
    opacity: 1;
    transform: translate(-50%, 0);
  }

  to {
    opacity: 0;
    transform: translate(-50%, 10px);
  }
}


/* 以下移动端调整 */
@media screen and (max-width: 768px) {
  .banner {
    height: 40vh;
  }

  .banner .b_wrapper {
    width: 75%;
  }

  .banner .b_text .b_btitle1 {
    font-size: 20px;
  }

  .banner .b_text .b_btitle {
    font-size: 22px;
  }

  .banner .b_text .b_summary {
    font-size: 14px;
    line-height: 1.4;
    margin-bottom: 20px;
  }

  .banner .b_scrool span {
    display: none;
  }

  .banner .swiper-pagination .swiper-pagination-bullet {
    width: 6px;
    height: 6px;
  }

  .banner .swiper-pagination .swiper-pagination-bullet.swiper-pagination-bullet-active {
    height: 20px;
    width: 6px;
  }

}