/* 测导航 */
.left-nav-container{
  position: relative;
}
.left-nav{
  position: sticky;
  top: 100px;
  left: 50px;
  margin-left: 50px;
}
.nav a {
text-decoration: none;
}
.dabiaotihe:target{
padding-top: 80px;
margin-top: -60px;

}
.xiaobiaoti:target{
padding-top: 80px;
margin-top: -60px;

}
.xiaobiaoti2:target{
padding-top: 80px;
margin-top: -60px;

}
/**
* Hidden fallback
*/
/* [hidden] {
display: none;
visibility: hidden;
} */

/**
* Styling navigation
*/
header {
left: 10%;
width: 100%;
/* box-shadow: 0 3px 12px rgba(0, 0, 0, 0.25); */
}

/*Styling top level items*/
.nav a,
.nav label {
display: block;
padding: 0.85rem;
color: #5271FF;
/* 一级、二级标题字颜色 */
background-color: transparent;
/* 一级标题背景颜色 */
box-shadow: inset 0 -1px #5271FF;

transition: all 0.25s ease-in;
}
.group-list a,
.group-list label {
padding-left: 2rem;
background: transparent;
box-shadow: inset 0 -1px #5271FF;
/**
     * 二级标题下背景颜色
     */
}
.nav a:focus, .nav a:hover,
.nav label:focus,
.nav label:hover {
color: white; 
background: #5271FF;
}

  /**
   * 鼠标放上后一级标题字颜色
   */
          /**
         * 鼠标放上后一级标题背景颜色
         */
.nav li a:hover {
color: white;
background: #5271FF;
}
/**
   * 鼠标放上后二级标题字颜色
   */
/**
         * 鼠标放上后二级标题背景颜色
         */

.nav label {
cursor: pointer;
}

/**
* Styling first level lists items
*/


.group-list a:focus, .group-list a:hover,
.group-list label:focus,
.group-list label:hover {
background: #00ff0400;

}

/**
* Styling second level list items
*/
.sub-group-list a,
.sub-group-list label {
padding-left: 4rem;
background: #0011ff;
box-shadow: inset 0 -1px #474747;
}
.sub-group-list a:focus, .sub-group-list a:hover,
.sub-group-list label:focus,
.sub-group-list label:hover {
background: #ff0000;
}

/**
* Styling third level list items
*/
.sub-sub-group-list a,
.sub-sub-group-list label {
padding-left: 6rem;
background: #454545;
box-shadow: inset 0 -1px #575757;
}
.sub-sub-group-list a:focus, .sub-sub-group-list a:hover,
.sub-sub-group-list label:focus,
.sub-sub-group-list label:hover {
background: #333333;
}

/**
* Hide nested lists
*/
.group-list,
.sub-group-list,
.sub-sub-group-list {
height: 100%;
max-height: 0;
overflow: hidden;
transition: max-height 0.5s ease-in-out;
}

.nav__list input[type=checkbox]:checked + label + ul {
/* reset the height when checkbox is checked */
max-height: 1000px;
}

/**
* Rotating chevron icon
*/
label > span {
float: right;
transition: transform 0.65s ease;
}

.nav__list input[type=checkbox]:checked + label > span {
transform: rotate(90deg);
}




/* 文本 */
  .bannertt {
      color: rgb(255, 255, 255);
      margin-top: 0;
      margin-bottom: 5px;
      font-size: 60px;
      text-transform: uppercase;
      text-shadow: 1px 1px 1px rgb(0 0 0 / 30%);
      font-family: 'Roboto', Helvetica, Arial, sans-serif;
      font-weight: 700;
      text-align: center;
  }

  .bannertt2 {
      letter-spacing: 2px;
      font-size: 16px;
      font: 14px/1.5em "Roboto";
  }

  .dabiaotihe {
      padding-top: 20px;
      font-family: 'Roboto', Helvetica, Arial, sans-serif;
      font-weight: 700;
      margin-bottom: 10px;
      font-size: 30px;

      text-align: center;
  }

  .wenbenkuang {

      font-family: 'Poppins', sans-serif;
      font-size: 18px;
      color: #3c4258;
      text-transform: initial;
      line-height: 1.8;
      text-align: justify;

  }

  .xiaobiaoti {
      font-size: 22px;
      font-family: 'Roboto', Helvetica, Arial, sans-serif;
      font-weight: 700;
      line-height: 1.2;
      display: block;
      margin-block-start: 1.33em;
      margin-block-end: 1.33em;
      margin-inline-start: 0px;
      margin-inline-end: 0px;
      color: #5271FF;
  }



/* timeline */
body {
  font-family: Arial, sans-serif;
  background-color: #ffffff;
}

.timeline {
  width: 600px;
  margin: 50px auto;
  position: relative;
}

.timeline:before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  width: 2px;
  height: 100%;
  background-color: #333;
  transform: translateX(-50%);
}

.timeline-item {
  position: relative;
  margin-bottom: 50px;
}

.timeline-item:before {
  content: '';
  position: absolute;
  top: 0;
  left: -10px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: #333;
}

.timeline-item .date {
  position: absolute;
  top: -25px;
  left: -50px;
  font-size: 25px;
  color: #999;
}
  .timeline-item .dated {
    position: absolute;
    top: -25px;
    left: -50px;
    font-size: 17px;
    color: #999;
  }

.timeline-item .content {
  background-color: #fff;
  padding: 20px;
  border-radius: 5px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}