:root {
  color-scheme: light;
  --ink: #181a1f;
  --muted: #5d6470;
  --line: #dce0e6;
  --paper: #ffffff;
  --wash: #f4f6f8;
  --accent: #2855d9;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--wash);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.65;
}

main {
  width: min(760px, calc(100% - 32px));
  margin: 48px auto;
  padding: clamp(28px, 6vw, 64px);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 18px;
}

h1, h2 { line-height: 1.2; }
h1 { margin: 0 0 24px; font-size: clamp(2rem, 6vw, 3.5rem); }
h2 { margin-top: 36px; font-size: 1.25rem; }
p, li { max-width: 68ch; }
.lead { color: var(--muted); font-size: 1.15rem; }
a { color: var(--accent); }
nav, footer { display: flex; flex-wrap: wrap; gap: 18px; }
nav { margin-bottom: 48px; }
footer { margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--line); color: var(--muted); }

@media (max-width: 560px) {
  main { margin: 16px auto; border-radius: 12px; }
}