:root {
    --text: #111;
    --muted: #555;
    --bg: #fff;
    --card: #f7f7f7;
    --border: #e6e6e6;
}

html, body {
    height: 100%;
    margin: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    padding: 28px 16px;
    border-bottom: 1px solid var(--border);
}

main {
    max-width: 980px;
    margin: 0 auto;
    padding: 18px 16px 56px;
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

h1 {
    margin: 0 0 8px;
    font-size: 28px;
}

.row {
    display: flex;
    align-items: center;
    gap: 10px;
}

.row h1 {
    margin: 0;
}

.meta {
    color: var(--muted);
    font-size: 14px;
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    padding: 14px 14px;
    border-radius: 12px;
    margin: 18px 0;
    text-transform: uppercase;
    a {
        text-transform: lowercase;
    }
}

h2 {
    margin: 26px 0 10px;
    font-size: 21px;
}

ul {
    margin: 8px 0 8px 20px;
}

a {
    color: inherit;
    text-decoration: none;
}

code {
    background: #f0f0f0;
    padding: 2px 6px;
    border-radius: 6px;
}

footer {
    border-top: 1px solid var(--border);
    padding: 18px 16px;
    color: var(--muted);
    font-size: 13px;
}

.toc a {
    text-decoration: none;
}

.toc li {
    margin: 4px 0;
}