.chapter1-section-00 {
    position: relative;
    height: 55vh;
    overflow-x: hidden;
    overflow: hidden;
}

.chapter1-section-00 img{
    position:absolute;
}

.TONG-BT1{
    top: 28%;
    left: 6%;
    width: 20%;
    height: auto;
    position:absolute;
    z-index: 2;
}

.TONG-BT2{
    top: 35%;
    left: 29%;
    width: 40%;
    height: auto;
    position:absolute;
    z-index: 2;
}

.TONG-BT3{
    width: 100%;
    height: auto;
    position:absolute;
    bottom:-10%;
    z-index: 1;
}


.content_extra{
    position: relative;
    z-index: 5;
}

.chapter1-pic2{
    height: 30vh;
    z-index: 1;
}



.TONG-GH{
    margin-top: -50vh;
    top: 0;
    width: 100%;
    height: auto;
    
}

.dl-zi-box {
    position: absolute; /* 设置定位上下文 */
    top: 50%;
    left: 50%;
    width: 6.45vw;
    height: 15vh;
    transform: translate(-50%, -50%);
}
  
.dl-zi,
.dl-zikeli {
    position: absolute; /* 绝对定位 */
    top: 0; /* 定位到 .dl-zi-box 的左上角 */
    left: 0; /* 定位到 .dl-zi-box 的左上角 */
    width: auto;
    height: 100%;
    z-index: 3;
}

.dl-liewen{
    width: 100%;
    bottom: 0;
    z-index: 2;
}

.dl-1{
    top: 7vw;
    right: 0;
    /* width: 18%; */
}

.dl-da1{
    top: 0;
    right: 0;
    height: 100%;
    z-index: 1;
}

.dl-content-img{
    position: relative;
    display: flex;
    align-items: center; /* 垂直居中 */
    height: 50vh;
    width: 100vw;
    overflow: hidden;
}

.dl-ditu{
    position: absolute;
    height: 30vh;
    width: auto;
    top: 30%;
    left: 50%;
    transform: translate(-50%, -50%);
    
}

.dl-taiyuanzi{
    position: absolute;
    height: 10vh;
    width: auto;
    top: 75%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 1;
}

.p-taiyuanwenzi{
    position: absolute;
    width: 100%;
    top: 75%;
    left: 50%;
    transform: translate(-50%, -50%);
    color:  rgb(66, 110, 66);
    font-size: 1rem;
    letter-spacing: 1rem; 
    z-index: 3;
}

.chapter1-section-12-content p{
    line-height: 2rem;  /* 行距，1.8倍行高 */
}

.chapter1-section-31{
    position: relative;
    height: 60vh;
}