body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #ffffff;
    color: #333;
}

header {
    background: #fff;
    color: #333;
    padding: 1rem 0;
    text-align: center;
    border-bottom: 1px solid #ddd;
}

header h1 {
    margin: 0;
    font-size: 2rem;
}

header nav ul {
    list-style: none;
    padding: 0;
}

header nav ul li {
    display: inline;
    margin: 0 1rem;
}

header nav ul li a {
    color: #333;
    text-decoration: none;
    font-weight: bold;
}

main {
    padding: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

section {
    margin-bottom: 2rem;
}

section h2 {
    color: #2c3e50;
    font-size: 1.5rem;
    border-bottom: 2px solid #2c3e50;
    padding-bottom: 0.5rem;
}

section h3 {
    color: #34495e;
    font-size: 1.2rem;
}

section h4 {
    color: #4a4a4a;
    font-size: 1rem;
}

section p, section ul {
    margin: 0.5rem 0;
}

section ul {
    list-style-type: disc;
    margin: 0;
    padding-left: 1.5rem;
}

footer {
    background: #fff;
    color: #333;
    text-align: center;
    padding: 1rem 0;
    border-top: 1px solid #ddd;
}