body {
    font-family: 'Helvetica Neue', Helvetica, Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    margin: 0;
    padding: 0;
    background: #f9f9f9;
    color: #222;
}
nav {
    background:#bcd0ea;
    padding: 0.5em 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.03);
}
nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    max-width: 90vw;
}
nav ul li {
    margin: 0 1.2em 0.5em 1.2em;
    word-break: break-all;
}
nav ul li a {
    color: #4f8cff;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.18em;
    letter-spacing: 0.5px;
    padding: 0.2em 0.5em;
    transition: color 0.2s;
}
nav ul li a:hover {
    color: #222;
}
header {
    text-align: center;
    padding: 2em 0 1em 0;
    background: #fff;
    box-shadow: 0 2px 8px rgba(0,0,0,0.03);
}
header h1 {
    margin: 0.2em 0 0.1em 0;
    font-size: 2.5em;
}
header p {
    color: #666;
    font-size: 1.2em;
}
section {
    max-width: 800px;
    margin: 2em auto;
    background: #fff;
    padding: 2em;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
section h2 {
    margin-top: 0;
    color: #4f8cff;
    border-left: 4px solid #4f8cff;
    padding-left: 0.5em;
    font-size: 1.5em;
}
.edu-item h3 {
    font-size: 1.35em;
    margin-bottom: 0.2em;
    margin-top: 1em;
    font-weight: bold;
}

ul, ol {
    margin: 1em 0 1em 1.5em;
}
footer {
    text-align: center;
    color: #888;
    padding: 1.5em 0 1em 0;
    font-size: 0.95em;
}
@media (max-width: 600px) {
    section {
        padding: 1em;
    }
    nav ul {
        flex-direction: column;
        align-items: center;
    }
    nav ul li {
        margin: 0.5em 0;
    }
}