@media screen and (max-width: 900px){ 

    body {
      background-color: rgb(247 251 253);
      width: 100vw;
    }
    *{
      -webkit-user-select: none;
      -moz-user-select: none;
      font-family: 'OPlusSans3';
      margin: 0;
      padding: 0;
      user-select: none;
      cursor: url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 8 8' width='8px' height='8px'><circle cx='4' cy='4' r='4' opacity='.5'/></svg>") 4 4, auto
    }
    
    .nav{
      height: 60px;
      background-color: rgba(255, 255, 255,0.4);
      box-shadow: 0px 1px 5px rgba(192, 192, 192, 0.815);
      backdrop-filter: blur(10px);
      display: flex;
      align-items: center;
      -webkit-backdrop-filter: blur(10px);
    }
    .nav img{
      margin-left: 30px;
      height: 35px;
    }
    
    .title {
      margin-top: -20px;
      font-size: 180%;
    }
    
    .middle{
        width: 100vw;
        eight: 200vh;
        overflow-y: scroll;
        scroll-snap-type: y mandatory;
    }

    .hr{
      height:1px;
      color:var(--black);
      background-color: var(--black);
      -webkit-animation: slide-top 1s both;
      animation: slide-top 1.1s both;
      border: none;
      border-radius: 10px;
      width: 50%;
    }

    .pagetitle{
        line-height: 60px;
        height: calc(100vh - 185px);
        scroll-snap-align: start;
        flex-flow: column;
	      justify-content: center;
        padding-top: calc(15vh);
        padding-left: 8vw;
    }
    .placards-top{
      text-align: left;
      line-height: calc(16vw);
      font-size: calc(16vw);
      margin-bottom: 20px;
      -webkit-animation: slide-top 1s both;
      animation: slide-top 1s both;
      -moz-animation: slide-top 1s both;
      -o-animation: slide-top 1s both;
    }
    
    .placards-bottom{
      text-align: left;
      font-size: calc(3.5vh);
      line-height: calc(4vh);
      margin-top: 10px;
      animation: slide-top 1.3s both;
      -moz-animation: slide-top 1.3s both;
      -webkit-animation: slide-top 1.3s both;
      -o-animation: slide-top 1.3s both;
    }
    
    .background{
      display: block;
      width: calc(70vw);
      height: calc(70vw);
      opacity: 1;
      background: linear-gradient(234.56deg, rgb(19, 140, 238) 0%, rgb(255, 167, 179) 100%);
      filter: blur(80px);
      border-radius: 100%;
      position: fixed;
      top: 0;
      bottom: 0;
      left: 0;
      right: 0;
      margin: auto;
      z-index: -1;
      animation: ab 20s infinite;
      animation-delay: -1;
      transition:0.5s;
      -webkit-filter: blur(100px);
      -webkit-transition:0.5s;
      -moz-transition: 0.5s;
      -o-transition: 0.5s;
      -moz-animation: ab 20s infinite;
      -webkit-animation: ab 20s infinite;
      -o-animation: ab 20s infinite;
      -webkit-animation-delay: -1;
      -moz-animation-delay: -1;
      -o-animation-delay: -1;
    }
    
    .pagepanel{
        height: calc(100vh);
        width: calc(100vw);
        scroll-snap-align: start;
        flex-flow: column;
        display: block;
    }

    .panel{
      transform: translateY(calc(35vh));
      height:calc(auto + 20px);
      width: calc(100vw - 60px);    
      background-color: rgba(255, 255, 255, 0.137);
      backdrop-filter: blur(10px);
      border: solid;
      padding-right: 20px;
      padding-left: 10px;
      border-color: rgba(236, 236, 236, 0.219);
      border-radius: 10px;
      margin-left: 3.25%;
      transition: 0.5s;
      -webkit-backdrop-filter: blur(10px);
      -webkit-transition: 0.5s;
      -moz-transition: 0.5s;
      -o-transition: 0.5s;
    }
    
    .panel:hover{
      transform:scale(1.005) translateY(calc(35vh));
      box-shadow: 0px 0px 10px rgba(49, 49, 49, 0.479);
      -webkit-transform:scale(1.005) translateY(calc(35vh));
      -moz-transform:scale(1.005) translateY(calc(35vh));
      -o-transform:scale(1.005) translateY(calc(35vh));
    }
    .div-btm{
      justify-content: space-around;
      display: flex;
    }
    .btm {
      border-radius: 5px;
      display: flex;
      justify-content: center;
      align-items: center;
      width: 100px;
      height: 55px;
      background-color: rgba(245, 245, 245, 0.2);
      margin-bottom: 20px;
      color: rgb(36, 36, 36);
      border: solid 1px;
      border-color: rgba(223, 223, 223, 0.637);
      font-size: 120%;
      text-decoration: none;
      transition-duration:0.5s;
      margin-left:10px;
      -webkit-transition-duration:0.5s;
      -moz-transition-duration:0.5s;
      -o-transition-duration:0.5s;
    }
    
    .btm:hover{
      background-color: #f9fbfd;
      transform: scale(1.03);
      border: solid 1px;
      border-color:#9c9a9a;
      box-shadow: 0px 0px 10px rgba(49, 49, 49, 0.479);
      -webkit-transform: scale(1.03);
      -moz-transform: scale(1.03);
      -o-transform: scale(1.03);
    }
    
    .title{
      padding-top: 30px;
      padding-left: 20px;
      padding-bottom: 10px;
      font-weight: 500;
      font-size: 140%;
    }
  
    .footnote{
      position: fixed;
      bottom: 5px;
      text-align: center;
      left: 0;
      right: 0;
      font-size: 15px;
    }
    /* 鼠标指针css，来自https://zhuanlan.zhihu.com/p/351951477 */
    #cursor {
      position: fixed;
      width: 16px;
      height: 16px;
      background: #000;
      border-radius: 8px;
      opacity: 0.25;
      z-index: 10086;
      pointer-events: none;
      transition: 0.2s ease-in-out;
      transition-property: background, opacity, transform;
      -webkit-transition: 0.2s ease-in-out;
      -moz-transition: 0.2s ease-in-out;
      -o-transition: 0.2s ease-in-out;
      -webkit-transition-property: background, opacity, transform;
      -moz-transition-property: background, opacity, transform;
      -o-transition-property: background, opacity, transform;
    }
    
    #cursor.hidden {
      opacity: 0;
    }
    
    #cursor.hover {
      opacity: 0.1;
      transform: scale(2.5);
      -webkit-transform: scale(2.5);
      -moz-transform: scale(2.5);
      -o-transform: scale(2.5);
    }
    
    #cursor.active {
      opacity: 0.5;
      transform: scale(0.5);
      -webkit-transform: scale(0.5);
      -moz-transform: scale(0.5);
      -o-transform: scale(0.5);
    }
  }