:root {
  --accent: #007AFF;
  --ink: #1d1d1f;
  --muted: #6e6e73;
  --line: #e5e5ea;
  --bg: #ffffff;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 64px 24px 96px;
}

header.site {
  border-bottom: 1px solid var(--line);
}

.site-inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 22px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-inner a.brand {
  font-weight: 600;
  font-size: 17px;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.site-inner nav a {
  color: var(--accent);
  text-decoration: none;
  font-size: 15px;
  margin-left: 20px;
}

.site-inner nav a:hover { text-decoration: underline; }

h1 {
  font-size: 34px;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 6px;
  font-weight: 700;
}

h2 {
  font-size: 22px;
  letter-spacing: -0.01em;
  margin: 44px 0 12px;
  font-weight: 600;
}

h3 {
  font-size: 18px;
  margin: 28px 0 6px;
  font-weight: 600;
}

p, li { color: var(--ink); }

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

.lead { font-size: 19px; color: var(--muted); margin: 0 0 8px; }

.updated {
  color: var(--muted);
  font-size: 15px;
  margin: 0 0 8px;
}

ul { padding-left: 22px; }
li { margin: 6px 0; }

.muted { color: var(--muted); }

hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 48px 0;
}

.card {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 22px 24px;
  margin: 16px 0;
  text-decoration: none;
  display: block;
  color: var(--ink);
  transition: border-color .15s ease;
}

.card:hover { border-color: var(--accent); }

.card h3 { margin: 0 0 4px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }

.links a { margin-right: 18px; }

.faq dt { font-weight: 600; margin-top: 18px; }
.faq dd { margin: 4px 0 0; color: var(--ink); }

.contact {
  background: #f5f5f7;
  border-radius: 14px;
  padding: 20px 24px;
  margin: 24px 0;
}

.contact strong { display: block; margin-bottom: 2px; }

footer.site {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

footer .site-inner { display: block; padding: 28px 24px; }

footer a { color: var(--muted); }

@media (max-width: 520px) {
  h1 { font-size: 28px; }
  .wrap { padding: 40px 20px 64px; }
}