:root {
  --bg: #ffffff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --line: #d2d2d7;
  --card: #f5f5f7;
  --accent: #0066cc;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --text: #f5f5f7;
    --muted: #a1a1a6;
    --line: #38383a;
    --card: #1c1c1e;
    --accent: #2997ff;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Helvetica Neue", Helvetica, Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
}
main, .bar, footer { max-width: 720px; margin: 0 auto; padding: 0 16px; }
.bar { padding-top: 16px; padding-bottom: 16px; border-bottom: 1px solid var(--line); }
.bar a { color: var(--text); font-weight: 600; text-decoration: none; }
h1 { font-size: 2rem; line-height: 1.2; margin: 32px 0 8px; }
h2 { font-size: 1.3rem; margin: 32px 0 8px; }
a { color: var(--accent); }
code { font-size: 0.9em; }
ul { padding-left: 1.2em; }
li { margin-bottom: 8px; }
.muted { color: var(--muted); margin-top: 0; }
.lead { font-size: 1.15rem; color: var(--muted); }
.card { background: var(--card); border-radius: 16px; padding: 4px 20px 16px; margin-top: 24px; }
.links { display: flex; flex-wrap: wrap; gap: 8px 20px; align-items: center; }
.button { background: var(--accent); color: #fff; padding: 8px 16px; border-radius: 999px; text-decoration: none; font-weight: 600; }
footer { color: var(--muted); font-size: 0.85rem; padding-top: 32px; padding-bottom: 32px; margin-top: 48px; border-top: 1px solid var(--line); }
footer a { color: var(--muted); }
.faq { border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; padding: 12px 0; font-weight: 600; }
.faq summary::marker { color: var(--muted); }
.faq p, .faq ul { margin-top: 0; }
.tip { display: inline-block; background: var(--card); color: var(--accent); border-radius: 999px; padding: 0 8px; font-size: 0.75rem; font-weight: 600; vertical-align: 2px; }