body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f9f9f9;
    margin: 0;
    padding: 0;
}

header {
    background-color: #282c34;
    color: white;
    padding: 1rem 0;
    margin-bottom: 2rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

nav ul {
    list-style: none;
    margin: 0;
    padding: 0 2rem;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background-color 0.3s ease;
}

nav a:hover {
    background-color: #555;
}

main {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

h1 {
    color: #282c34;
    border-bottom: 2px solid #007bff;
    padding-bottom: 0.5rem;
}

h2 {
    color: #555;
    margin-top: 1.5rem;
}

p {
    margin: 1rem 0;
}

pre {
    background-color: #f4f4f4;
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 1rem;
    overflow-x: auto;
    font-family: 'Courier New', monospace;
}

@media (max-width: 768px) {
    nav ul {
        flex-direction: column;
        padding: 1rem;
    }
    
    main {
        padding: 1rem;
    }
}