:root {
  --bg: #ffffff;
  --surface: #f6f7f9;
  --text: #1c1f24;
  --muted: #5b6370;
  --border: #e3e6eb;
  --accent: #1a5fd0;
  --accent-text: #ffffff;
  --code-bg: #eef1f5;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121418;
    --surface: #1b1e24;
    --text: #e7e9ee;
    --muted: #a0a7b4;
    --border: #2c3139;
    --accent: #7aa7ff;
    --accent-text: #0d1117;
    --code-bg: #232831;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial,
    "PingFang SC", "Microsoft YaHei", sans-serif;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 0 16px; }
header.site {
  border-bottom: 1px solid var(--border);
  padding: 14px 0;
}
header.site .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.brand { font-weight: 650; color: var(--text); text-decoration: none; }
nav a { color: var(--muted); text-decoration: none; margin-left: 16px; font-size: 15px; }
nav a:first-child { margin-left: 0; }
nav a:hover, nav a[aria-current="page"] { color: var(--text); }
main.wrap { padding-top: 40px; padding-bottom: 56px; }
h1 { font-size: 2rem; line-height: 1.25; margin: 0 0 12px; letter-spacing: -0.01em; }
h2 { font-size: 1.3rem; margin: 40px 0 10px; line-height: 1.35; }
h3 { font-size: 1.05rem; margin: 24px 0 6px; }
p, ul, ol { margin: 0 0 14px; }
ul, ol { padding-left: 22px; }
li { margin-bottom: 6px; }
a { color: var(--accent); }
.lede { font-size: 1.15rem; color: var(--muted); margin-bottom: 24px; }
.meta { color: var(--muted); font-size: 14px; }
code {
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  font-size: 0.9em;
  background: var(--code-bg);
  padding: 1px 5px;
  border-radius: 4px;
  overflow-wrap: anywhere;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px 20px;
  margin: 20px 0;
}
.card p:last-child, .card ul:last-child { margin-bottom: 0; }
.button {
  display: inline-block;
  background: var(--accent);
  color: var(--accent-text);
  text-decoration: none;
  padding: 9px 16px;
  border-radius: 8px;
  font-weight: 600;
  margin: 4px 8px 4px 0;
}
.button.secondary { background: transparent; color: var(--accent); border: 1px solid var(--border); }
table { width: 100%; border-collapse: collapse; margin: 0 0 16px; font-size: 15px; }
th, td { text-align: left; vertical-align: top; padding: 8px 10px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; }
.table-scroll { overflow-x: auto; }
hr { border: 0; border-top: 1px solid var(--border); margin: 48px 0; }
.toc { columns: 2; column-gap: 32px; font-size: 15px; }
@media (max-width: 560px) {
  h1 { font-size: 1.6rem; }
  .toc { columns: 1; }
  nav a { margin-left: 12px; }
}
footer.site {
  border-top: 1px solid var(--border);
  padding: 20px 0 32px;
  color: var(--muted);
  font-size: 14px;
}
footer.site a { color: var(--muted); }