:root {
    --fg: #111;
    --bg: #fff;
    --muted: #666;
    --primary: #0d6efd
}

* {
    box-sizing: border-box
}

body {
    margin: 0;
    font-family: system-ui, Segoe UI, Roboto, Arial, sans-serif;
    color: var(--fg);
    background: var(--bg)
}

header,
footer {
    padding: 16px;
    border-bottom: 1px solid #eee
}

footer {
    border-top: 1px solid #eee;
    border-bottom: none
}

main {
    padding: 16px;
    max-width: 960px;
    margin: 0 auto
}

nav a {
    margin-right: 12px;
    color: var(--primary);
    text-decoration: none
}

nav a:hover {
    text-decoration: underline
}

h1,
h2 {
    margin: 8px 0
}