body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    /* background-color: #ffffff; */
    background: url('images/background.jpg') no-repeat center center fixed; /* 设置背景图像 */
    background-size: cover; /* 使背景图像覆盖整个页面 */
    color: #f3e6fe;
}
header {
    text-align: center;
    padding: 20px 0;
    background-color: #ffffff70;
}
nav ul {
    list-style-type: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
    gap: 20px;
}
nav ul li {
    display: inline;
}
nav ul li a {
    text-decoration: none;
    color: #4a90e2;
    font-size: 1.2rem;
    transition: color 0.3s;
}
nav ul li a:hover {
    color: #357ab8;
}
h1 {
    font-size: 3rem;
    margin: 0;
    color: #4a90e2;
}
p {
    font-size: 1.2rem;
    color: #666;
}
.buttons {
    margin-top: 30px;
    display: flex;
    justify-content: center;
    gap: 15px;
}
button {
    padding: 10px 20px;
    font-size: 1rem;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    background: linear-gradient(135deg, #4a90e2, #357ab8);
    color: white;
    transition: background 0.3s, box-shadow 0.3s;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}
button:hover {
    background: linear-gradient(135deg, #357ab8, #4a90e2);
    box-shadow: 0 6px 8px rgba(0, 0, 0, 0.15);
}
.content {
    width: 80%;
    margin: 0 auto;
    padding: 20px;
    background-color: rgba(235, 246, 255, 0.464);
}
.authors {
    text-align: center;
    font-size: 1rem;
    margin-top: 30px;
}
.footer {
    width: 100%;
    text-align: center;
    background-color: #ffffff00;
    margin-top: 30px;
}
.footer img {
    width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
}

/* 导航菜单项的基础样式 */
.nav-item {
  background-color: #ffffff;
  color: #000000;
  padding: 10px 20px;
  display: inline-block;
  margin-right: 10px;
  transition: background-color 0.3s ease;
}

/* 悬停时的过渡效果 */
.nav-item:hover {
  background-color: #003366;
  color: #ffffff;
}
/* 动态效果 */
/* 
@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
      transform: translateY(0);
    }
    40% {
      transform: translateY(-10px);
    }
    60% {
      transform: translateY(-5px);
    }
  }
  
  .bounce-item {
    animation: bounce 2s infinite;
  } */

/* 应用于具体的导航菜单项 */
.nav-menu .bounce-item {
  display: inline-block;
  margin-right: 10px;
}

.nav-menu {
  display: flex;
  justify-content: space-around;
  align-items: center;
  background-color: #fab44400;
  overflow: visible;
  margin-top: 20px;
}

.nav-menu a {
  color: #bda4f7;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  font-size: 17px;
}

.nav-menu a:hover {
  background-color: #ddd;
  color:  #410eb9d8;
}

@media screen and (max-width: 600px) {
  .nav-menu {
    flex-direction: column;
  }
}