:root {
  --bg: #ffffff;
  --fg: #14171c;
  --muted: #5b6470;
  --line: #e6e8ec;
  --accent: #4f46e5;
  --card: #f7f8fa;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --fg: #eceef2;
    --muted: #9aa3b0;
    --line: #232832;
    --accent: #8b87ff;
    --card: #171a21;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
header, main, footer { max-width: 760px; margin: 0 auto; padding: 0 20px; }
header { display: flex; align-items: center; justify-content: space-between; height: 64px; border-bottom: 1px solid var(--line); max-width: none; padding: 0; }
header .bar { width: 100%; max-width: 760px; margin: 0 auto; padding: 0 20px; display: flex; align-items: center; justify-content: space-between; }
header a.brand { font-weight: 800; font-size: 18px; color: var(--fg); text-decoration: none; }
header nav a { color: var(--muted); text-decoration: none; margin-left: 18px; font-size: 14px; }
header nav a:hover { color: var(--fg); }
main { padding-top: 48px; padding-bottom: 48px; }
h1 { font-size: 36px; line-height: 1.2; margin: 0 0 12px; letter-spacing: -0.02em; }
h2 { font-size: 20px; margin: 36px 0 10px; }
p, li { color: var(--muted); }
ul { padding-left: 20px; }
a { color: var(--accent); }
.lead { font-size: 18px; }
.card {
  display: block; text-decoration: none; background: var(--card);
  border: 1px solid var(--line); border-radius: 14px; padding: 20px; margin: 16px 0;
}
.card strong { color: var(--fg); font-size: 18px; display: block; }
.card span { color: var(--muted); }
.card:hover { border-color: var(--accent); }
.updated { font-size: 14px; }
footer { border-top: 1px solid var(--line); max-width: none; padding: 0; }
footer .bar { max-width: 760px; margin: 0 auto; padding: 24px 20px; font-size: 14px; color: var(--muted); }
footer a { color: var(--muted); }