:root {
  --bg: #f6f8fa; --surface: #ffffff; --text: #11151b; --muted: #57606a; --line: #d8dee4; --accent: #0a7490;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #11151b; --surface: #181d25; --text: #f5f7fa; --muted: #9aa4b0; --line: #2a313b; --accent: #6fe6ff; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif; }
main, header, footer { max-width: 760px; margin: 0 auto; padding: 0 16px; }
header { display: flex; flex-wrap: wrap; row-gap: 4px; align-items: center; gap: 12px; padding-top: 28px; padding-bottom: 8px; }
header img { width: 44px; height: 44px; border-radius: 10px; }
header a { color: inherit; text-decoration: none; font-weight: 600; font-size: 22px; letter-spacing: -0.5px; }
nav { margin-left: auto; display: flex; gap: 16px; font-size: 15px; }
nav a { color: var(--muted); font-weight: 500; font-size: 15px; }
h1 { font-size: 34px; line-height: 1.2; letter-spacing: -0.8px; margin: 32px 0 8px; }
h2 { font-size: 22px; margin: 36px 0 8px; }
p.lead { font-size: 19px; color: var(--muted); margin-top: 0; }
a { color: var(--accent); }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 4px 20px; margin: 16px 0; }
ol li, ul li { margin: 6px 0; }
code { font: 14px ui-monospace, SFMono-Regular, Menlo, monospace; background: var(--surface); border: 1px solid var(--line); border-radius: 6px; padding: 1px 5px; white-space: nowrap; }
.note { color: var(--muted); font-size: 15px; }
footer { color: var(--muted); font-size: 14px; padding-top: 32px; padding-bottom: 40px; border-top: 1px solid var(--line); margin-top: 48px; }