/* 背景图片及动效 */
    /* 背景图片网上找的,这个看起来重复也不会很突兀 */
     *{
      user-select: none;
      }
      body{
        background-image: url(../images/background.png);
        background-position: center;
      }
      body::after{
        content: '';
        z-index: -2;
        position: fixed;
        top: 0;
        right: 0;
        left: 0;
        bottom: 0;
        background: inherit;
        filter: blur(1px) brightness(0.8) saturate(1.5) contrast(1.1);
        /* 高斯模糊+调暗+饱和度+对比度,看起来好多了,不过每次打开貌似有点卡. */
      }
      /* 这段是背景下落动效 */
      .backgroundanime{
        top: 0;
        position: absolute;
        width: 100%;
        height: 100%;
        z-index: -1;
        overflow: hidden;
        display: flex;
        align-items: start;
      }
      .backgroundanime span{    
        margin-left: auto;
        margin-right: auto;
        text-align: center;
        font-size: larger;
        width: 30px;
        height: 30px;
        /* 不知道为什么这里总是emoji不居中在光圈中心,反反复复调成这个参数正好是中心,但是一改又完蛋了 */
        background-color: rgba(4, 11, 193, 0.1);
        border-radius: 50%;
        box-shadow: 0 0 0 0.8vmax rgba(0, 154, 197, 0.1);
        animation: backgroundanime linear infinite;
        /* 匀速下落,反复播放,模拟下落,不过太丑了决定用变量控制动画时间来调整速度 */
        animation-duration: calc(170s/var(--i));
      }
      /* 取偶数,主要是为了看起来不太单调 */
      .backgroundanime span:nth-child(even){
        background-color: rgba(86, 231, 1, 0.1);
        box-shadow: 0 0 0 0.8vmax rgba(245, 98, 6, 0.1);
      }
      @keyframes backgroundanime{
        0%{
          box-shadow:  rgba(0, 0, 255, 0.1); transform: translateY(-10vh) scale(1);
        }
        50%{
          box-shadow:  rgba(0, 255, 0, 0.1); transform: translateY(-10vh) scale(0.5);
        }
        100%{
          box-shadow: rgba(255, 0, 0, 0.1); transform: translateY(100vh) scale(0.75);
        }
    }
    /* 实际上代码实现的只有外面的光圈,里面那东西都是emoji  */
      
      /* 头部导航栏 */
      .container {
        width: 80%;
        margin: auto;
      }
      .header {
        background-color: rgba(26, 26, 26, 0.6);
        color: #fff;
        padding-top: 25px;
        min-height: 70px;
        border-bottom: #0066cc 3px solid;
        border-radius:10px;
        align-items: center;
      }
      .header a {
        color: #fff;
        text-decoration: none;
        font-size: 18px;
        margin-right: auto;
      }
      .header .navigation li {
        display: inline;
        padding: 0 20px 0 20px;
      }
      .navigation{
        list-style: none;
        text-align: right;
      }
      .navigation2{
        margin-top: 0px;
        margin-bottom: 20px;
        padding: 9px;
        padding-top: 40px;
        float: right;
        max-width: 100px;
        border-radius: 20px;
        background-color: rgba(26, 26, 26, 0.2);
        animation: navigation2-show  0.25s ease-out;
      }
      @keyframes navigation2-show {
        0%{
          opacity: 0;
          transform: translateY(-50px);
        }
        100%{
          opacity: 1;
        }    
      }
  
      .header .navigation2 li {
        width: inherit;
        text-align: center;
        padding-top: 20px;
      }
      .header #branding h1 span {
        color: #000000;
        background-color: #e8491d;
      }
      .header .current a {
        color: #e8491d;
        font-weight: bold;
      }
      /* 类似超级列表框现行选中项的感觉 */
      .header .navigation li a:hover{
        color: #069a10;
      }
      /* 公告栏 */
      .jumbotron {
        background-color: rgba(159, 181, 246, 0.72);
        color: #fff;
        padding-top: 0%;
        text-align: center;
        align-items: center;
        margin: auto;
        width: 80%;
        border-radius: 10px;
      }
  
      /* 文章概览栏 */
      .main {
        padding: 20px 0; 
      }
      .main a{
        text-decoration: none;
        color: inherit;
      }
      .content {
        float: left;
        width: 70%;
        background: rgba(255, 255, 255, 0.8);
        padding: 20px;
        box-shadow: 0 2px 4px rgba(0,0,0,0.1);
        margin-bottom: 20px;
        border-radius: 8px;
      }
      .content h2 {
        color: #0066cc;
        border-bottom: #0066cc 4px solid;
        padding-bottom: 20px;
      }
      .content p {
        margin-bottom: 20px;
      }
      .content-authorAndtime{
        float: inline-end;
        font-size: 1rem;
        color: #656565;
      }
      .post{
        position: relative;
      }
      .post img{
        opacity: 1;
        box-sizing: border-box;
        position: absolute;
        max-height: 120px;
        right: 0;
        top: -10px;
        border-radius: 8%;
        transform-style: preserve-3d;
        transition: opacity 0.1s ease-out;
        animation: post-img-show 0.5s ease-out;
      }
      @keyframes post-img-show {
        0%{
          opacity: 0;
          transform: translatex(-20vw);
        }
        100%{
          opacity: 1;
        }    
      }
      .sidebar {
        align-items: center;
        background: rgba(255, 255, 255, 0.6);
        padding: 20px;
        box-shadow: 0 2px 4px rgba(0,0,0,0.1);
        margin-bottom: 20px;
        border-radius: 30px;
        width: 15vw; 
        max-width: 120px;
        z-index: 2;
        top: 70vh;
        float: right;
        min-width: 130px;
      }
  
      .clear {
        clear: both;
      }