body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

nav {
    background-color: #333;
    color: white;
    padding: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

nav ul li {
    margin-right: 20px;
}

nav ul li a {
    color: white;
    text-decoration: none;
}

.content-section {
    display: none;
    padding: 20px;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

table, th, td {
    border: 1px solid #ddd;
}

th, td {
    padding: 8px;
    text-align: left;
}

form label {
    display: block;
    margin-top: 10px;
}

form input, form button {
    margin-top: 5px;
    width: 100%;
    padding: 8px;
}

form button {
    background-color: #333;
    color: white;
    border: none;
    cursor: pointer;
    margin-top: 10px;
}

form button:hover {
    background-color: #555;
}

/* 响应式设计 */
@media (max-width: 768px) {
    nav ul {
        flex-direction: column;
    }

    nav ul li {
        margin-right: 0;
        margin-bottom: 10px;
    }

    .content-section {
        padding: 10px;
    }

    table {
        font-size: 14px;
    }

    form input, form button {
        padding: 6px;
    }
}

@media (max-width: 480px) {
    table {
        font-size: 12px;
    }

    th, td {
        padding: 4px;
    }

    form input, form button {
        padding: 4px;
    }
}