:root {
  color-scheme: light;
  --ink: #172033;
  --muted: #59657a;
  --line: #d9e0ea;
  --accent: #2257d6;
  --surface: #f5f8fc;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  font: 16px/1.65 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

header, main, footer {
  width: min(760px, calc(100% - 40px));
  margin-inline: auto;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.brand { font-weight: 750; letter-spacing: -0.02em; }
nav { display: flex; gap: 18px; }
a { color: var(--accent); text-underline-offset: 3px; }

main { padding: 72px 0 80px; }
h1 { margin: 0 0 18px; font-size: clamp(2.25rem, 7vw, 4.5rem); line-height: 1.02; letter-spacing: -0.055em; }
h2 { margin-top: 48px; font-size: 1.45rem; letter-spacing: -0.02em; }
p, li { max-width: 68ch; }
.lead { color: var(--muted); font-size: 1.2rem; }
.panel { margin-top: 40px; padding: 24px; background: var(--surface); border: 1px solid var(--line); border-radius: 14px; }
.meta { color: var(--muted); font-size: .9rem; }
footer { padding: 24px 0 48px; border-top: 1px solid var(--line); color: var(--muted); }

@media (max-width: 560px) {
  header { align-items: flex-start; gap: 18px; }
  nav { flex-direction: column; gap: 4px; }
  main { padding-top: 52px; }
}