:root {
  --bg: #f6f7f9; --card: #ffffff; --fg: #1b1f24; --muted: #5d6573; --line: #dde1e6; --accent: #2456d4;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #121417; --card: #1b1e23; --fg: #e5e8ec; --muted: #9aa3af; --line: #30353d; --accent: #6b95ff; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 40px 20px 64px; }
header { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 28px; }
.brand { font-weight: 700; font-size: 20px; color: var(--fg); text-decoration: none; letter-spacing: -0.01em; }
.brand span { color: var(--accent); }
nav a { color: var(--muted); text-decoration: none; margin-left: 16px; font-size: 15px; }
nav a:hover { color: var(--fg); }
h1 { font-size: 34px; line-height: 1.2; letter-spacing: -0.02em; margin: 0 0 12px; }
h2 { font-size: 22px; margin: 36px 0 8px; letter-spacing: -0.01em; }
h3 { font-size: 17px; margin: 22px 0 4px; }
p, li { color: var(--fg); }
.lead { font-size: 19px; color: var(--muted); margin: 0 0 24px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 22px 24px; margin: 18px 0; }
.muted { color: var(--muted); }
a { color: var(--accent); }
code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 14px;
  background: var(--bg); border: 1px solid var(--line); border-radius: 4px; padding: 0 4px; }
ul { padding-left: 22px; }
li { margin: 4px 0; }
hr { border: 0; border-top: 1px solid var(--line); margin: 48px 0 8px; }
.lang { font-size: 14px; color: var(--muted); }
footer { margin-top: 48px; font-size: 14px; color: var(--muted); }
blockquote { margin: 12px 0; padding: 10px 16px; border-left: 3px solid var(--accent); background: var(--card); border-radius: 0 8px 8px 0; }
.card > :first-child { margin-top: 0; }
.card > :last-child { margin-bottom: 0; }