body {
    font-family: Arial, 'Noto Sans TC', sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    color: #333;
}
header {
    background: #2c3e50;
    padding: 20px;
}
nav ul {
    display: flex;
    list-style: none;
    padding: 0;
    margin: 0;
    justify-content: center;
}
nav ul li {
    margin: 0 15px;
}
nav ul li a {
    color: white;
    text-decoration: none;
    font-weight: bold;
}
nav ul li a:hover {
    color: #3498db;
}
main {
    max-width: 1200px;
    margin: 20px auto;
    padding: 0 20px;
}
h1 {
    font-size: 2.5em;
    color: #2c3e50;
    text-align: center;
    margin-bottom: 20px;
}
h2 {
    font-size: 1.8em;
    color: #34495e;
    margin-top: 30px;
}
h3 {
    font-size: 1.4em;
    color: #34495e;
}
img {
    max-width: 100%;
    height: auto;
    margin: 20px 0;
}
ul {
    padding-left: 20px;
}
footer {
    background: #2c3e50;
    color: white;
    text-align: center;
    padding: 20px;
    margin-top: 40px;
}
@media (max-width: 768px) {
    nav ul {
        flex-direction: column;
        align-items: center;
    }
    nav ul li {
        margin: 10px 0;
    }
    h1 {
        font-size: 2em;
    }
    main {
        padding: 0 10px;
    }
}