:root {
    --text: #1a1a1a;
    --muted: #666;
    --link: #0033cc;
    --background: #fafafa;
    --max-width: 640px;
    --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    background: var(--background);
    color: var(--text);
    font-family: var(--font-stack);
    font-size: 17px;
    line-height: 1.6;
}

main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 4rem 1.5rem;
}

header {
    margin-bottom: 2.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid #e5e5e5;
}

h1 {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0;
    letter-spacing: -0.01em;
}

section p {
    margin: 0 0 1.25rem 0;
}

code {
    background: #f0f0f0;
    padding: 0.1em 0.35em;
    border-radius: 3px;
    font-size: 0.9em;
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

a {
    color: var(--link);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

footer {
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid #e5e5e5;
    color: var(--muted);
    font-size: 0.9rem;
}

@media (prefers-color-scheme: dark) {
    :root {
        --text: #e5e5e5;
        --muted: #999;
        --link: #6699ff;
        --background: #1a1a1a;
    }
    code { background: #2a2a2a; }
    header, footer { border-color: #333; }
}