.Pro h1{
    font-size: 3.125rem;
    text-align: center;
    padding: 3.75rem;
    color: #000;
}
.Pro h1 p{
    font-size: 1.25rem /* 20/16 */;
    text-align: center;
    color: #000;
}
.four{
    height: 46.875rem /* 750/16 */;

    display: flex;
    justify-content: center;
    align-items: center;
    /* 渐变背景 */
    background: linear-gradient(200deg,#ffffff,#c5e0ff);
}
.card{
    position: relative;
    width: 20rem /* 320/16 */;
    height: 26.25rem /* 420/16 */;
    margin: 2.5rem /* 40/16 */;
    float: left;
    color: #f5f5f5;
    /* 阴影 */
    box-shadow: 0 .0625rem /* 1/16 */ .0625rem /* 1/16 */ rgba(0,0,0,0.1),
    0 2px 2px rgba(0,0,0,0.1),
    0 4px 4px rgba(0,0,0,0.1),
    0 8px 8px rgba(0,0,0,0.1),
    0 16px 16px rgba(0,0,0,0.1);
    /* 溢出隐藏 */
    overflow: hidden;
}
.card::before{
    content: "";
    width: 100%;
    height: 110%;
    position: absolute;
    top: 0;
    left: 0;
    /* background-image: url(/images/139/1.jpg); */
    background-size: cover;
    background-position: 0 0;
    /* 过渡效果: css属性名 时长 贝塞尔曲线 */
    transition: transform 1s cubic-bezier(0.19,1,0.22,1);
}
/* 分别设置图片 */
.card:nth-child(1)::before{
    background-image: url(../images/p11.png);
}
.card:nth-child(2)::before{
    background-image: url(../images/p22.png);
}
.card:nth-child(3)::before{
    background-image: url(../images/p33.png);
}
.card:nth-child(4)::before{
    background-image: url(../images/p44.png);
}
/* 遮罩 */
.card::after{
    content: "";
    display: block;
    width: 100%;
    height: 200%;
    background: linear-gradient(to bottom,
    rgba(0,0,0,0) 0%,
    rgba(0,0,0,0.25) 55%,
    rgba(0,0,0,0.8) 100%);
    /* 绝对定位 */
    position: absolute;
    left: 0;
    top: 0;
    transform: translateY(0);
    /* 过渡效果 */
    transition: transform 1.4s cubic-bezier(0.19,1,0.22,1);
}
.card .content{
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    z-index: 1;
    padding: 1rem /* 16/16 */ .5rem /* 8/16 */;
    transform: translateY(76%);
    transition: transform 0.7s cubic-bezier(0.19,1,0.22,1);
}
.card h2{
    font-size: 1.4375rem /* 23/16 */;
    font-weight: bold;
}
.card p{
    font-size: .9375rem /* 15/16 */;
    /* 字间距 */
    letter-spacing: .125rem /* 2/16 */;
    width: 80%;
    line-height: 1.875rem /* 30/16 */;
    margin-top: 1.5625rem /* 25/16 */;
    /* 文本两端对齐 */
    text-align: justify;
}
.card button{
    cursor: pointer;
    border: none;
    background-color: rgba(255, 255, 255, 0.288);
    color: #fff;
    padding: .75rem /* 12/16 */ 1.5rem /* 24/16 */;
    font-size: .75rem /* 12/16 */;
    font-weight: bold;
    margin-top: 1.5625rem /* 25/16 */;
}
.card button:hover{
    background-color: #94e1ff56;
}
.card .content *:not(h2){
    /* .content下，除了h2，其他元素隐藏并下移20px */
    opacity: 0;
    transform: translateY(20px);
    transition: transform 0.7s cubic-bezier(0.19,1,0.22,1),opacity 0.7s cubic-bezier(0.19,1,0.22,1);
}
.card:hover{
    align-items: center;
}
.card:hover::before{
    transform: translateY(-5%);
}
.card:hover::after{
    transform: translateY(-50%);
}
.card:hover .content{
    transform: translateY(0);
}
.card:hover .content *:not(h2){
    opacity: 1;
    transform: translateY(0);
    /* 过渡效果延迟 */
    transition-delay: 0.1s;
}
.Pr{
    height: 31.25rem /* 500/16 */;

}
.Pr ul{
    margin: auto;
    
}
.Pr li{
    float: left;
    padding: 3.3rem;
    margin: auto;
    
}
.Pr li img{
    height: 25rem /* 400/16 */;
    width: 20rem /* 320/16 */;

    transition: transform 0.2s ease-in;
}

.Pr li img:hover {
    transform: scale(1.1);
  }

@media screen and (max-width: 1700px){
    .Pr{
        height: auto /* 1200/16 */;
    }

}


.Pr li img:hover {
    transform: scale(1.1);
  }

  @media screen and (max-width: 1000px){
    .Pro h1{
        font-size: 1.75rem;
        padding: 1.5rem;
    }
    .Pr li img{
        width: 30vw;
        height: auto;
        margin: 0;
        padding: 1rem;
        padding-top: 0;
        
    }
    .Pr ul{
        width: 100vw;
        margin: 0;
        padding: 0;
    }
    .Pr li{
        float: left;
        margin: 0;
        padding-left: 0.5rem;
        width: 30vw;
    }
    .four{
        display: flex;
        flex-wrap: wrap;
        height: auto;

    }
    .card {
        min-width: 12.5rem /* 200/16 */;
        height: auto;

    
    }
    .card content {
        width: 100%;
    }
    }