:root {
  --ink: #1d2a33;
  --muted: #5b6770;
  --line: #dfe3e6;
  --accent: #1f4e5f;
  --bg: #ffffff;
  --panel: #f5f7f8;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
.wrap { max-width: 720px; margin: 0 auto; padding: 0 20px; }
header { border-bottom: 1px solid var(--line); }
header .wrap { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 8px; padding-top: 18px; padding-bottom: 18px; }
.brand { font-weight: 700; font-size: 18px; color: var(--accent); text-decoration: none; }
.brand span { font-weight: 700; color: var(--accent); margin-left: 8px; padding-left: 10px; border-left: 1px solid var(--line); }
nav a { color: var(--muted); text-decoration: none; margin-left: 18px; font-size: 15px; }
nav a:first-child { margin-left: 0; }
nav a:hover { color: var(--accent); }
main { padding: 40px 0 56px; }
h1 { font-size: 32px; line-height: 1.2; margin: 0 0 16px; }
h2 { font-size: 22px; margin: 40px 0 10px; }
h3 { font-size: 18px; margin: 28px 0 6px; }
p, li { color: var(--ink); }
.lead { font-size: 19px; color: var(--muted); }
a { color: var(--accent); }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 18px 20px; margin: 16px 0; }
.card p:first-child { margin-top: 0; }
.card p:last-child { margin-bottom: 0; }
.small { font-size: 14px; color: var(--muted); }
footer { border-top: 1px solid var(--line); padding: 24px 0 32px; font-size: 14px; color: var(--muted); }
footer p { margin: 4px 0; color: var(--muted); }
@media (max-width: 520px) {
  h1 { font-size: 26px; }
  nav a { margin-left: 12px; }
  .brand span { display: block; margin: 2px 0 0; padding: 0; border: 0; }
}