/* 本页头部标题高亮 */
body{
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

header .nav .PwuTop a {
    color: #fff;
    font-weight: 700;
}

/* 主体内容 */
.PWUS {
    display: flex;
    width: 70%;
    
}

section .container {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    width: 100%;
    padding: 0 2rem;
    
}
/* piece1 */
.container .title {
    display: flex;
    justify-content: center; 
    align-items: center;
    width: 100%;
    height: 3rem;
    padding-bottom: 1.5rem;
    margin-top: 4rem;
    border-bottom: 2px solid rgba(0,0,0,0.3);
    font-family: "Source Han Sans SC", "Source Han Sans SC";
    font-weight: bold;
    font-size: 2.5rem;
    color: #1F2937;
    
}

.container .content1 {
    width: 100%;
    
    
}

.container .hr{
    width: 100%;
    height: 0.4rem;
    background-color: #232536;
    margin: 1.7rem 0;
    border: none;
}

.content2 {
    width: 100%;    
    margin-bottom: 2.5rem;
        
}

.piece {
    display: flex;
    flex-direction: column;
    margin-bottom: 1rem;
    font-family: "Roboto", sans-serif;
    font-weight: 400;
    font-size: 1.2rem;
    color: #1E1B1B;
    text-align: left;
    font-style: normal;
    text-transform: none;
    margin-top: 1rem;
    
}

section  .img {
    width: 100%;
    height: auto;
    margin-top: 1.1rem;
}