:root {
  --bg: #ffffff;
  --fg: #1d2330;
  --muted: #5b6475;
  --accent: #2357d9;
  --border: #e3e6ec;
  --card: #f6f7fa;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151c;
    --fg: #e6e9ef;
    --muted: #9aa3b5;
    --accent: #7fa3ff;
    --border: #2a303c;
    --card: #1a1f29;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

a { color: var(--accent); }

.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }

header { border-bottom: 1px solid var(--border); }
header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-top: 18px; padding-bottom: 18px; }
.brand { font-weight: 700; font-size: 1.15rem; color: var(--fg); text-decoration: none; }
nav { display: flex; flex-wrap: wrap; gap: 18px; font-size: 0.95rem; }
nav a { color: var(--muted); text-decoration: none; }
nav a:hover, nav a[aria-current="page"] { color: var(--fg); }

main { padding: 48px 0 64px; }
h1 { font-size: 2.1rem; line-height: 1.2; margin: 0 0 12px; }
h2 { font-size: 1.3rem; margin: 40px 0 8px; }
h3 { font-size: 1.05rem; margin: 24px 0 4px; }
.lead { font-size: 1.15rem; color: var(--muted); margin-top: 0; }
.meta { color: var(--muted); font-size: 0.9rem; }

.card { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 18px 22px; margin: 24px 0; }
.card p:first-child { margin-top: 0; }
.card p:last-child { margin-bottom: 0; }

ol.steps { padding-left: 1.3em; }
ol.steps li { margin-bottom: 6px; }

footer { border-top: 1px solid var(--border); color: var(--muted); font-size: 0.9rem; }
footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; padding-top: 20px; padding-bottom: 28px; }
footer a { color: var(--muted); }