:root {
    --fg: #111;
    --muted: #555;
    --bg: #fff;
    --link: #0b57d0;
    --border: #e5e7eb;
    --code: #0b1020;
    --codebg: #f6f8fa;
}

html,
body {
    background: var(--bg);
    color: var(--fg);
    font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
    line-height: 1.55;
}

body {
    margin: 0;
}

header {
    border-bottom: 1px solid var(--border);
    padding: 18px 16px;
}

main {
    max-width: 980px;
    margin: 0 auto;
    padding: 24px 16px 64px;
}

h1 {
    font-size: 24px;
    margin: 0 0 6px;
}

.sub {
    color: var(--muted);
    font-size: 14px;
    margin: 0;
}

h2 {
    font-size: 18px;
    margin-top: 28px;
    border-top: 1px solid var(--border);
    padding-top: 18px;
}

h3 {
    font-size: 16px;
    margin-top: 18px;
}

p,
li {
    font-size: 15px;
}

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

a:hover {
    text-decoration: underline;
}

.cite {
    font-size: 0.92em;
    white-space: nowrap;
}

.note {
    border: 1px solid var(--border);
    background: #fafafa;
    padding: 10px 12px;
    border-radius: 10px;
    color: var(--muted);
}

pre,
code {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

pre {
    background: var(--codebg);
    border: 1px solid var(--border);
    padding: 12px;
    border-radius: 10px;
    overflow: auto;
}

code {
    color: var(--code);
}

.mermaid {
    border: 1px solid var(--border);
    background: #fff;
    padding: 12px;
    border-radius: 10px;
    overflow: auto;
}


table {
    width: 100%;
    border-collapse: collapse;
    margin: 12px 0;
    font-size: 14px;
}

th,
td {
    border: 1px solid var(--border);
    padding: 8px;
    vertical-align: top;
}

th {
    background: #fafafa;
    text-align: left;
}

hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 22px 0;
}

ol.refs {
    padding-left: 20px;
}

ol.refs li {
    margin: 8px 0;
}

.back {
    font-size: 13px;
    color: var(--muted);
    margin-left: 8px;
}

.kbd {
    border: 1px solid var(--border);
    background: #fff;
    padding: 1px 6px;
    border-radius: 6px;
    font-size: 12px;
}