:root {
  --bg: #ffffff;
  --fg: #16181d;
  --muted: #5b6270;
  --accent: #fe2c55;
  --card: #f5f6f8;
  --border: #e3e5ea;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --fg: #eceef2;
    --muted: #9aa1ad;
    --card: #181b21;
    --border: #2a2e36;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
}
.wrap { max-width: 860px; margin: 0 auto; padding: 0 16px; }
header { border-bottom: 1px solid var(--border); }
header .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { font-weight: 700; font-size: 20px; color: var(--fg); text-decoration: none; }
.logo span { color: var(--accent); }
nav a { color: var(--muted); text-decoration: none; margin-left: 20px; font-size: 15px; }
nav a:hover { color: var(--fg); }
main { padding: 48px 0 64px; }
h1 { font-size: 38px; line-height: 1.2; margin: 0 0 16px; }
h2 { font-size: 24px; margin: 40px 0 12px; }
h3 { font-size: 18px; margin: 0 0 6px; }
p, li { color: var(--muted); }
.lead { font-size: 19px; max-width: 640px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; margin-top: 24px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 20px; }
.card p { margin: 0; }
ol.steps li { margin-bottom: 8px; }
a { color: var(--accent); }
.doc h2 { font-size: 20px; margin-top: 32px; }
.updated { font-size: 14px; }
footer { border-top: 1px solid var(--border); padding: 24px 0; font-size: 14px; color: var(--muted); }
footer a { color: var(--muted); margin-right: 16px; }
@media (max-width: 560px) {
  h1 { font-size: 30px; }
  nav a { margin-left: 12px; }
}