:root {
  --bg: #ffffff;
  --fg: #1d1d1f;
  --muted: #6e6e73;
  --accent: #0071e3;
  --card: #f5f5f7;
  --border: #e0e0e2;
  --maxw: 760px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --fg: #f5f5f7;
    --muted: #a1a1a6;
    --accent: #2997ff;
    --card: #1c1c1e;
    --border: #2c2c2e;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  font-size: 17px;
}
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 32px 20px 80px; }
header.site {
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  z-index: 10;
}
header.site .wrap { padding: 14px 20px; display: flex; align-items: center; justify-content: space-between; }
header.site a.brand { font-weight: 600; text-decoration: none; color: var(--fg); font-size: 16px; }
header.site nav a { text-decoration: none; color: var(--muted); margin-left: 18px; font-size: 15px; }
header.site nav a:hover { color: var(--accent); }
h1 { font-size: 34px; line-height: 1.15; letter-spacing: -0.02em; margin: 8px 0 4px; }
h2 { font-size: 22px; margin: 40px 0 8px; letter-spacing: -0.01em; }
.updated { color: var(--muted); font-size: 15px; margin-bottom: 8px; }
p, li { color: var(--fg); }
a { color: var(--accent); }
ul { padding-left: 22px; }
li { margin: 6px 0; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 20px;
  margin: 20px 0;
}
.muted { color: var(--muted); font-size: 15px; }
footer.site { border-top: 1px solid var(--border); margin-top: 60px; }
footer.site .wrap { padding: 24px 20px; color: var(--muted); font-size: 14px; display: flex; flex-wrap: wrap; gap: 6px 18px; justify-content: space-between; }
footer.site a { color: var(--muted); text-decoration: none; }
footer.site a:hover { color: var(--accent); }
.hero-links { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.btn {
  display: inline-block; text-decoration: none;
  background: var(--accent); color: #fff;
  padding: 12px 22px; border-radius: 999px; font-weight: 500; font-size: 16px;
}
.btn.secondary { background: var(--card); color: var(--fg); border: 1px solid var(--border); }