/* 通用设置 */
body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    font-family: Arial, sans-serif;
    overflow: hidden; /* 防止滚动 */
  }
  
  .cover-wrapper {
    position: relative;
    width: 100%;
    height: 100%;
    background: url('../img/cover/background.png') no-repeat center center fixed; /* 动态背景 */
    background-size: cover;
  }
  
  /* 导航栏样式 */
  .cover-nav {
    position: absolute;
    top: 20px;
    right: 20px;
  }
  
  .cover-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 15px;
  }
  
  .cover-nav ul li {
    display: inline;
  }
  
  .cover-nav ul li a {
    color: white;
    text-decoration: none;
    font-size: 18px;
  }
  
  .cover-nav ul li a:hover {
    text-decoration: underline;
  }
  
  /* 中间介绍样式 */
  .intro {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: white;
  }
  
  .intro h2 {
    font-size: 36px;
    margin-bottom: 20px;
  }
  
  .intro p {
    font-size: 18px;
    margin-bottom: 30px;
  }
  
  .intro button {
    background-color: goldenrod;
    color: white;
    border: none;
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s;
  }
  
  .intro button:hover {
    background-color: darkorange;
  }