.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: 11.25rem;
    height: 100%;
}

.first-4>div:nth-child(3) {
    width: 11.5rem;
    height: 100%;
}

.first-4>div:nth-child(4) {
    width: 10.875rem;
    height: 100%;
}

.first-4 img {
    width: 7.25rem;
}

.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 {
    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, .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;
}