:root {
  color-scheme: light dark;
  --bg: #f6f7fb;
  --fg: #1b1c22;
  --muted: #5c5f6b;
  --accent: #3355c8;
  --line: #dadde8;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #111318; --fg: #e3e4ea; --muted: #a6a9b6; --accent: #b4c5ff; --line: #2c2f38; }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", sans-serif;
}
main { max-width: 760px; margin: 0 auto; padding: 48px 20px 80px; }
header { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
h1 { font-size: 1.9rem; line-height: 1.25; margin: 0 0 4px; }
h2 { font-size: 1.2rem; margin: 36px 0 8px; }
a { color: var(--accent); }
.muted { color: var(--muted); }
.lang a { margin-left: 12px; }
ul { padding-left: 1.2rem; }
li { margin: 4px 0; }
.card { border: 1px solid var(--line); border-radius: 16px; padding: 16px 20px; margin: 16px 0; }