/* Base typography */
html {
    font-family: system-ui, -apple-system, BlinkMacSystemFont,
                 "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: #222;
    background-color: #fafafa;
}

body {
    max-width: 720px;
    margin: 2.5rem auto;
    padding: 0 1.25rem;
}

/* Headings */
h1, h2, h3 {
    font-weight: 600;
    line-height: 1.25;
}

h1 {
    text-align: center;
    margin-bottom: 0.5rem;
}

h2 {
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    border-bottom: 1px solid #ddd;
    padding-bottom: 0.25rem;
}

h3 {
    margin-top: 1.75rem;
    margin-bottom: 0.5rem;
}

/* Paragraphs */
p {
    margin: 0.5rem 0 1rem 0;
}

/* Links */
a {
    color: #0055aa;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Images */
img {
    display: block;
    margin: 1rem auto;
    max-width: 100%;
    height: auto;
}

/* Horizontal rule */
hr {
    border: none;
    border-top: 1px solid #ddd;
    margin: 2rem 0;
}