* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: Georgia, serif;
    color: #222;
    background: #fff;
    max-width: 720px;
    margin: 0 auto;
    padding: 2rem 1rem;
    line-height: 1.6;
}

header nav {
    display: flex;
    gap: 1.5rem;
    border-bottom: 1px solid #eee;
    padding-bottom: 1rem;
    margin-bottom: 2.5rem;
}

header nav a {
    font-family: monospace;
    font-size: 1rem;
    color: #555;
    text-decoration: none;
}

header nav a:hover { color: #222; }

.intro { margin-bottom: 2rem; }
.intro h1 { font-size: 2rem; margin-bottom: 0.4rem; }

h1, h2, h3 { margin: 1.5rem 0 0.5rem; }
p { margin-bottom: 1rem; }
a { color: #0057b7; }

ul { padding-left: 1.5rem; margin-bottom: 1rem; }
li { margin-bottom: 0.3rem; }

footer {
    margin-top: 3rem;
    border-top: 1px solid #eee;
    padding-top: 1rem;
    color: #999;
    font-size: 0.85rem;
}