nav {
    background:  #A3D9FF;
    padding: 15px 0;
    margin-right: 18%;
    margin-left: 18%;
    text-align: center;
    border-radius: 20px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

nav ul li {
    display: inline;
    margin: 10px 10px;
}

nav ul li a {
    color: #004771;
    text-decoration: none;
    font-weight: bold;
    padding: 5px 15px;
    border-radius: 5px;
    transition: background-color 0.3s;
}

nav ul li a:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

.content {
    max-width: 1200px;
    margin: 20px auto;
    width: 100%;
    padding: 20px;
    border: 1px solid #daf0fe;
    border-radius: 10px;
}

.content h2 {
    color: #007bff;
    font-size: 1.4rem;
    margin-top: 20px;
    margin-bottom:15px;
    padding-bottom: 10px; /* 为标题下方添加内边距，以便分割线与标题文本之间有间距 */
    border-bottom: 2px solid #ddd; /* 在标题下方添加一条浅灰色的分割线 */
}

.content ul {
    list-style: disc;
    margin-left: 20px;
    font-size: 1rem;
    margin-top: 30px;
}

.content ul li {
    margin-bottom: 10px;
    cursor: pointer;
}

.content ul li a {
    text-decoration: none;
    color: #000;
}

.content ul li a:hover {
    color: #007bff;
}

.content ul li:nth-child(5n) {
    border-bottom: 1px solid #ddd;
    margin-bottom: 18px;
    padding-bottom: 18px;
}

.pagination {
    text-align: center;
    margin-top: 20px;
}

.pagination span,
.pagination a {
    margin: 0 5px;
    text-decoration: none;
    color: #191818;
}

.pagination input[type="text"] {
    width: 50px;
    padding: 5px;
    text-align: center;
    border: 1px solid #ccc;
    border-radius: 5px;
}

.pagination button {
    padding: 5px 10px;
    background-color: #007bff;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}