body {
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.7;
    padding: 40px;
    max-width: 800px;
    margin: auto;
    background: #fafafa;
    color: #333;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 5px;
}

.subtitle {
    font-size: 1rem;
    color: #666;
}

section {
    margin-bottom: 50px;
}

h2 {
    border-left: 5px solid #ff3366;
    padding-left: 10px;
    margin-bottom: 10px;
}

h3 {
    margin-top: 20px;
}

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

pre {
    background: #eee;
    padding: 15px;
    border-radius: 8px;
}

footer {
    margin-top: 60px;
    text-align: center;
    color: #777;
}