body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    margin: 0;
    padding: 0;
    background: #fafafa;
    color: #333;
}

header {
    background: #2d3e50;
    color: #fff;
    padding: 1rem;
    text-align: center;
}

header h1, header h2 {
    margin: 0.2em 0;
}

header nav a {
    margin: 0 1em;
    color: #fff;
    text-decoration: none;
    font-weight: 500;
}

header nav a:hover {
    text-decoration: underline;
}

main {
    padding: 2rem;
    max-width: 800px;
    margin: auto;
}

.highlight {
    color: #ff9800;
}

footer {
    background: #2d3e50;
    color: #fff;
    padding: 1rem;
    text-align: center;
    margin-top: 2rem;
}