:root {
  --bg: #ffffff;
  --fg: #16202e;
  --muted: #5b6b82;
  --rule: #e2e8f0;
  --accent: #1d4ed8;
  --card: #f6f8fb;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1626;
    --fg: #e8eef7;
    --muted: #96a8c2;
    --rule: #24334a;
    --accent: #7aa2ff;
    --card: #16223a;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  -webkit-text-size-adjust: 100%;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 20px 80px;
}

header.site {
  display: flex;
  align-items: baseline;
  gap: 14px;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 18px;
  margin-bottom: 32px;
}

header.site .name { font-size: 22px; font-weight: 700; letter-spacing: -0.01em; }
header.site nav { margin-left: auto; display: flex; gap: 18px; font-size: 15px; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

h1 { font-size: 30px; line-height: 1.25; letter-spacing: -0.02em; margin: 0 0 8px; }
h2 { font-size: 19px; margin: 34px 0 8px; letter-spacing: -0.01em; }
h3 { font-size: 16px; margin: 22px 0 6px; }
p { margin: 0 0 14px; }
ul { margin: 0 0 14px; padding-left: 22px; }
li { margin-bottom: 6px; }

.updated { color: var(--muted); font-size: 14px; margin-bottom: 26px; }
.lede { font-size: 17px; color: var(--muted); margin-bottom: 26px; }

.card {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 12px;
  padding: 18px 20px;
  margin: 22px 0;
}
.card p:last-child { margin-bottom: 0; }

.divider {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 48px 0 34px;
}

footer.site {
  border-top: 1px solid var(--rule);
  margin-top: 56px;
  padding-top: 18px;
  color: var(--muted);
  font-size: 14px;
}

code {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 5px;
  padding: 1px 5px;
  font-size: 14px;
}

:lang(zh) { line-height: 1.8; }