:root {
  --text: #1d1d1f;
  --muted: #6e6e73;
  --bg: #fbfbfd;
  --card: #fff;
  --line: #d2d2d7;
  --accent: #0071e3;
}
@media (prefers-color-scheme: dark) {
  :root {
    --text: #f5f5f7;
    --muted: #a1a1a6;
    --bg: #000;
    --card: #1c1c1e;
    --line: #38383a;
    --accent: #2997ff;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  color: var(--text);
  background: var(--bg);
  -webkit-text-size-adjust: 100%;
}

main {
  max-width: 680px;
  margin: 0 auto;
  padding: 48px 16px 64px;
}

nav {
  display: flex;
  gap: 16px;
  font-size: 15px;
  margin-bottom: 32px;
}
nav a[aria-current] { color: var(--text); font-weight: 600; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

h1 { font-size: 32px; line-height: 1.2; margin: 0 0 4px; letter-spacing: -0.01em; }
h2 { font-size: 20px; margin: 32px 0 8px; }
h3 { font-size: 17px; margin: 0 0 4px; }
p { margin: 0 0 12px; }

.updated { color: var(--muted); font-size: 15px; margin-bottom: 24px; }

section {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 24px;
  margin-top: 24px;
}

.faq > div + div { margin-top: 20px; }

footer {
  margin-top: 32px;
  color: var(--muted);
  font-size: 14px;
  text-align: center;
}