* {
  margin: 0;
  padding: 0;
}

html, body {
  overflow: hidden;
  font-family: sans-serif;
  font-weight: 100;
  background-color: #212121;
  width: 100%;
  height: 100%;
  text-rendering: optimizeLegibility;
}
html .content, body .content {
  text-align: center;
  position: relative;
  top: 50%;
  transform: translateY(-50%);
}
html .content .random, body .content .random {
  color: #eee;
  opacity: 0;
  display: inline-block;
  font-size: 1.5rem;
  text-transform: uppercase;
  font-weight: 100;
  cursor: pointer;
}
html .social, body .social {
  position: absolute;
  bottom: 30%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  text-align: center;
}
html .list-item, body .list-item {
  display: inline-block;
  width: 110px;
  text-align: center;
}
html .list-item .item-link, body .list-item .item-link {
  font-size: 12px;
  text-decoration: none;
  color: #7F7F7F;
  transition: .3s ease-out all;
}
html .list-item .item-link:focus, body .list-item .item-link:focus {
  outline: none;
}
html .list-item .item-link:after, body .list-item .item-link:after {
  content: "";
  position: relative;
  width: 0;
  height: 1px;
  display: block;
  z-index: 100;
  background-color: cyan;
  transition: .3s ease-out all;
  left: 50%;
  top: 5px;
  transform: translateX(-50%);
}
html .list-item .item-link:hover, body .list-item .item-link:hover {
  color: #eee;
}
html .list-item .item-link:hover:after, body .list-item .item-link:hover:after {
  width: 50px;
}

.randomCharacter {
  display: inline-block;
  height: 10px;
}

.instructions a {
  color: inherit; 
  text-decoration: none; 
}

.instructions {
  position: absolute;
  bottom: 10%;            
  left: 50%;
  transform: translateX(-50%);
  color: #eee;             
  font-size: 1.5rem;      
  font-weight: 100;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  pointer-events: auto;   
  z-index: 10;
}

.instructions a {
  color: inherit;
  text-decoration: none;
}

.instructions {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -10%);
  color: #eee;
  font-size: 1.5rem;
  font-weight: 100;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  z-index: 10;
}

.instructions a {
  color: inherit;
  text-decoration: none;
}

/* 版权信息：窗口最底部往上 20px，水平中央 */
.copyright {
  position: fixed;          /* 相对于视口 */
  bottom: 20px;             /* 离底部 20px */
  left: 50%;
  transform: translateX(-50%);
  font-size: 14px;
  font-weight: 100;
  letter-spacing: 0.1em;
  z-index: 10;
}

.copyright a {
  color: #ababab;
  text-decoration: none;
  transition: color 0.3s ease;
}

.copyright a:hover {
  color: #fff;
}

   .email {
            position: absolute;
            top: 70%;
            left: 50%;
             font-size: 14px;
            transform: translate(-50%, -50%);
            color: rgba(255, 255, 255, 0.8);
            font-size: 1.5rem;
             border: 2px solid rgba(255, 255, 255, 0.8);
            text-decoration: none;
            z-index: 10;
            transition: all 0.3s ease;
            padding: 8px 16px;
            border-radius: 4px;
        }
        
     

      .email:hover {
            color: rgba(255, 255, 255, 1);
            border: 3px solid rgba(255, 255, 255, 0.8);
            background-color: rgba(255, 255, 255, 0.1);
        }