.first {
  position: relative;
  overflow: hidden;
}

.first-bg {
  position: absolute;
  width: 100%;

  top: 0;
  left: 0;
  z-index: 1;
}
.first-1 {
  position: absolute;
  z-index: 2;
  top: 45%;
  left: 5%;
}
.first-2 {
  position: absolute;
  z-index: 2;
  bottom: 5%;
  left: 4%;
}
.first-3 {
  position: absolute;
  z-index: 2;
  bottom: 5%;
  left: 50%;
}
.first-4 {
  position: absolute;
  right: 8%;
  bottom: 0;
  height: 12rem;
  width: 39.375rem;
  z-index: 2;
  display: flex;
}

.first-4 > div:nth-child(1) {
  width: 12.5rem;
  height: 100%;
}
.first-4 > div:nth-child(2) {
  width: 12.5rem;
  height: 100%;
}
.first-4 > div:nth-child(3) {
  width: 9.25rem;
  height: 100%;
}
.first-4 > div:nth-child(4) {
  width: 9.25rem;
  height: 100%;
}
.first-4 > div:nth-child(5) {
  width: 10.875rem;
  height: 100%;
}
.first-4 img {
  width: 7.25rem;
}
.first-4-pc {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-left: -2rem;
  margin-right: -0.5rem;
}
.first-4-pc-top {
  position: absolute;
  top: 1rem;
  left: 0;
  right: 0;
  margin: auto;
}
.first-4-pc > a > img {
  width: 6.25rem;
}
.first-4-1 {
  display: flex;
  align-items: center;
  justify-content: center;
}
.first-4-1 > img {
  width: 95%;
}
.first-4-2 {
  box-sizing: border-box;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  align-content: center;
  justify-content: center;
}
.first-4-2-con {
  height: 5.9375rem;
  /* background: darkblue; */
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  align-content: space-between;
  justify-content: center;
}
.first-4-2 img {
  width: 100%;
  transition: all 0.3s;
}
.first-4-2-con img:hover,
.first-4-pc-main:hover {
  filter: brightness(70%);
}

.first-4-3 {
  position: relative;
}
.first-4-3:hover .first-4-3-icon {
  transform: translateX(10px);
}
.first-4-3-bg {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 1;
}
.first-4-3-p {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 2;
}
.first-4-3 > img {
  width: 70%;
}
.first-4-3-p > img {
  transition: all 0.5s;
}
.first-4-3-p > img:hover {
  transform: scale(1.1);
}
.first-4-3-icon {
  position: absolute;
  top: 50%;
  left: 60%;
  z-index: 3;
  transition: all 0.3s;
}
.first-zhe {
  position: absolute;
  width: 100%;
  height: 18rem;
  bottom: 0;
  z-index: 1;
  background-image: linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0),
    rgba(0, 0, 0, 0.7)
  );
}
.first-4-mumu {
  height: 5.9375rem;
  display: flex;
  align-items: center;
  margin-left: 1rem;
}
.first-4-mumu img {
  width: 100%;
}
.first-yuyue {
  position: absolute;
  right: 8%;
  bottom: 0;
  height: 12rem;
  width: 26rem;
  z-index: 2;
  display: flex;
  /* background: forestgreen; */
  padding-bottom: 2rem;
  box-sizing: border-box;
  justify-content: space-between;
  align-items: center;
}
.first-yuyue-img {
  width: 18.5rem;
  height: 4.25rem;
}
.first-yuyue-play {
  width: 6.25rem;
  height: 6.25rem;
}