:root {
  --blue: #203dea; --yellow: #fbc349; --bg: #fbf8ff; --text: #1b1b21; --muted: #46464f; --card: #ffffff; --line: #e4e1e9;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #131318; --text: #e4e1e9; --muted: #c7c5d0; --card: #1f1f25; --line: #35343a; }
  a { color: #bac3ff; }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
header { background: var(--blue); color: #fff; }
header .wrap { display: flex; align-items: center; gap: 12px; padding-top: 20px; padding-bottom: 20px; }
header img { width: 40px; height: 40px; border-radius: 11px; }
header a { color: #fff; text-decoration: none; font-weight: 700; font-size: 22px; }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 16px; }
main { padding: 24px 0 48px; }
h1 { font-size: 30px; line-height: 1.2; margin: 8px 0 4px; }
h2 { font-size: 20px; margin: 32px 0 8px; }
h3 { font-size: 17px; margin: 20px 0 4px; }
a { color: var(--blue); }
.muted { color: var(--muted); }
.lang { margin: 8px 0 24px; }
hr { border: 0; border-top: 1px solid var(--line); margin: 48px 0; }
.button {
  display: inline-block; background: var(--blue); color: #fff; padding: 14px 24px; border-radius: 999px;
  text-decoration: none; font-weight: 600; margin: 8px 8px 8px 0;
}
.button.secondary { background: var(--card); color: var(--text); border: 1px solid var(--line); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 24px; margin: 16px 0; }
.code { font: 600 22px/1.4 ui-monospace, monospace; letter-spacing: 2px; word-break: break-all; }
footer { color: var(--muted); font-size: 14px; padding: 24px 0 40px; border-top: 1px solid var(--line); }