.chapter3-section-00{
    /* margin-top: 10vh; */
    width: 100vw;
    height: 100vh;
    display: flex;
    align-items: center; /* 垂直居中 */
    justify-content: center; /* 水平居中 */
    position: relative;
    overflow: hidden;
    margin-top: -20vh;
    /* background-image: url('/img/NL-正文背景.png'); */
    background-position: center;
    background-repeat: repeat;
    background-size: contain; /* 或 cover，取决于您的需求 */
    overflow-x: hidden; 
}

.chapter3-section-00 img{
    position: absolute;
}

.X-BT1{
    width: 26%;
    height: auto;
    left: 15%;
    top: 28%;
}

.X-BT2{
    width: 38%;
    height: auto;
    left: 42%;
    top: 30%;
}

.X-BT3{
    width: 100%;
    height: auto;
    z-index: 3;
}

.X-BT4{
    width: 70%;
    height: auto;
    bottom: 3%;
}


.biaozhi {
    display: block; /*  为了使宽度生效，需要将图片设置为块级元素 */
    margin: 1rem auto; /*  auto 值使图片水平居中 */
    width: calc(100vw - 2rem); /*  宽度设置为100vw并减去左右两边的1rem */
    border-radius: 1rem;  /*  设置四周圆角 */
}

.nanlao-3{
    bottom: 0;
    right: 0;
    height: 100%;
    width: auto;
    z-index: 1;
}

.nanlao-shui{
    top: -2.8%;
    left: -5.4%;
    width: 80%;
    opacity: 1;
    z-index: 3;
}

.nanlao-heshang{
    bottom: 2%;
    right: 0;
    width: 80%;
    z-index: 2;
}

.nanlao-nanlaozi{
    top: 36%;
    left: 50%;
    width: 10%;
    transform: translate(-50%, -50%);
    z-index: 5;
}

.nanlao-long{
    top: 0;
    left: 0;
    width: 32%;
    z-index: 2;
}

.nanlao-herobeijing{
    top: 0;
    left: 0;
    width: 100%;
    z-index: 0;
}


.nanlao-juanzhou{
    right: 0;
    width: 100vw;
}

.chapter3-section-11{
    width: 100vw;
    height: 110vh;
    position: relative;
    overflow: hidden;
    margin-top: -5vh
}

.chapter3-section-11 img{
    position: absolute;
}

/* .section11-content{
    margin-top: 10vh;
} */

.X-ZS{
    position: absolute;
    width: 100%;
    height: auto;
    z-index: 2;
}

.section-11-content1{
    padding-top: 10vh;
}


.nanlao-yezi{
    top: 0;
    right: 0;
    width: 50%;
    z-index: 1;
}

.nanlao-shanshang{
    top: 10%;
    left: 0;
    width: 100%;
    z-index: 1;
}

.nanlao-shanxia{
    bottom: -2%;
    width: 102%;
    z-index: 1;
}

.nanlao-chuan{
    bottom: 15%;
    left: 0;
    width: 30%;
    z-index: 1;
}




.chapter3-section-12{
    width: 100vw;
    height: 100vw;
    margin: 5rem auto;
    overflow: hidden;
}

.nanlao-jinciquan{
    width: 100vw;
}

/* chapter3-section-11 */
.bian-content{
    height: 3vh;
    display: flex;
    justify-content: center;
    
}

.nanlao-bian{
    width: 70vw;
    opacity: 0.8;

}


.chapter3-section-20{
    /* height: 130vh; */
    width: 100%;
}



.chapter3-section-30{
    position: relative;
    height: 35vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;  /* 垂直排列 */
    justify-content: start; /* 主轴(垂直方向)居中 */
    align-items: center;     /* 交叉轴(水平方向)居中 */  
    /* background-image: url('/img/X-H.png'); */
    background-position: center;
    /* background-repeat: repeat; */
    background-size: cover; /* 或 cover，取决于您的需求 */
    overflow-x: hidden; 
    margin: 10vh 0;
}



.chapter3-section-40{
    position: relative;
    height: 60vh;
}
.X-H{
    position: absolute;
    width: 100%;
    height: auto;
    bottom: 10%;
}

.X-Y{
    position: absolute;
    bottom: 30%;
    left: 50%;
    width: 53%;
    transform: translate(-50%, -50%);;
    z-index: 0;
}





.section30-content{
    position: absolute;
    /* margin: 1 auto; */
    top: 30%;
    left: 50%;
    width: 70%;
    z-index: 3;
    transform: translate(-50%, -50%);
}


.section30-content p {
    font-size: 0.85rem;
    text-indent: 2em;  /* 首行缩进2个字符 */
    letter-spacing: 2px;  /* 字符间距 */
    line-height: 1.7;  /* 行距，1.8倍行高 */
    text-align: left;  /* 左对齐 */
    z-index: 5;
}


.nanlao-biaozhikuang{
    position: absolute;
    top: 30%;
    left: 50%;
    width: 84%;
    transform: translate(-50%, -50%);
    z-index: 0;
}




.chapter3-section-60{
    position: relative;
    height: 70vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;  /* 垂直排列 */
    justify-content: center; /* 主轴(垂直方向)居中 */
    align-items: center;     /* 交叉轴(水平方向)居中 */  
    /* margin-top: 30vh; */
}

.section60-content{
    margin: 1 auto;
    z-index: 5;
}

.nanlao-30{
    position: absolute;
    top: 50%;
    left: 50%;
    width: 85%;
    transform: translate(-50%, -50%);
    border-radius: 1.5rem;
    z-index: -1;
}


.chapter3-section-71{
    height: 30vh;
    position: relative;
}

.X-DT{
    width: 80%;
    /* 补充高度自适应，避免图片拉伸变形 */
    height: auto;
    position: absolute;
    top: 50%;
    left: 50%;
    /* 平移居中，与定位配合实现完美居中 */
    transform: translate(-50%, -50%);
    /* 可选：优化图片渲染（尤其GIF动图） */
    image-rendering: auto;
}

.chapter3-section-80{
    position: relative;
    height: 70vh;
}

.X-D{
    position: absolute;
    width: 100%;
    height: auto;
    /* margin-top: 15vh; */
    margin-top: 10vh;
    z-index: -1;
    opacity: 1; 
}