body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #ffffff;
    color: #111;
}

header, footer {
    background-color: #f0f0f0;
    padding: 20px;
    text-align: center;
}

main {
    max-width: 800px;
    margin: auto;
    padding: 20px;
}

h1, h2, h3 {
    color: #1a1a1a;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 20px auto;
}

ul, ol {
    padding-left: 20px;
}

a {
    color: #0077cc;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

details {
    margin-bottom: 10px;
}

summary {
    font-weight: bold;
    cursor: pointer;
}

code {
    background-color: #eee;
    padding: 2px 4px;
    border-radius: 4px;
    font-family: monospace;
}

section {
    margin-bottom: 30px;
}

footer p {
    font-size: 14px;
    color: #555;
}