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

header {
    position: fixed; /* 使header悬浮在顶部 */
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #004488;
    color: white;
    padding: 10px 20px;
    z-index: 1000; /* 确保header在其他内容之上 */
}

.logo h1 {
    margin: 0;
    font-size: 1.5em;
}

.navbar ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
}

.navbar li {
    margin-left: 20px;
}

.navbar a {
    color: white;
    text-decoration: none;
    font-weight: bold;
}

.menu-toggle {
    display: none;
    font-size: 24px;
    cursor: pointer;
}

main {
    padding-top: 60px; /* 为内容留出空间，避免被固定的header遮挡 */
    padding-left: 20px;
    padding-right: 20px;
}

main p {
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.6;
}

footer {
    text-align: center;
    padding: 20px;
    background-color: #f1f1f1;
    color: #333;
}

/* Responsive Styles */
@media (max-width: 768px) {
    .navbar ul {
        flex-direction: column;
        display: none;
    }

    .menu-toggle {
        display: block;
    }

    .navbar.active ul {
        display: flex;
    }

    main p {
        max-width: 100%;
        padding: 0 10px;
    }
}