body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 1.5em;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    background-color: #f9f9f9;
    color: #222;
    line-height: 1.6;
}

h1 {
    font-size: 1.8em;
    margin-bottom: 0.4em;
}

h2 {
    font-size: 1.4em;
    margin-top: 1.5em;
    border-bottom: 1px solid #ddd;
    padding-bottom: 0.3em;
}

strong {
    font-weight: 600;
    display: block;
    margin-top: 1.2em;
    margin-bottom: 0.3em;
}

ul {
    padding-left: 1.2em;
    margin: 0;
}

li {
    margin-bottom: 0.4em;
}

a {
    color: #1a0dab;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

@media screen and (max-width: 600px) {
    body {
        padding: 1em;
    }

    h1 {
        font-size: 1.5em;
    }

    ul {
        padding-left: 1em;
    }
}
header {
    padding-bottom: 1em;
    border-bottom: 2px solid #eee;
    margin-bottom: 2em;
}

main {
    background: white;
    padding: 1.5em;
    border-radius: 8px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
}

footer {
    margin-top: 3em;
    padding-top: 1em;
    border-top: 1px solid #eee;
    font-size: 0.9em;
    color: #666;
    text-align: center;
}