:root {
  --text: #1a202c;
  --muted: #4a5568;
  --accent: #0369a1;
  --border: #e2e8f0;
  --bg: #ffffff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }

header { border-bottom: 1px solid var(--border); }
header .wrap { display: flex; justify-content: space-between; align-items: center; padding-top: 16px; padding-bottom: 16px; flex-wrap: wrap; gap: 8px; }
.brand { font-weight: 700; font-size: 1.1rem; color: var(--text); text-decoration: none; }
nav a { color: var(--muted); text-decoration: none; margin-left: 20px; }
nav a:first-child { margin-left: 0; }
nav a:hover { color: var(--accent); }

main { padding: 48px 0; }
h1 { font-size: 2.2rem; line-height: 1.2; margin: 0 0 16px; }
h2 { font-size: 1.4rem; margin: 40px 0 12px; }
p, li { color: var(--muted); }
a { color: var(--accent); }

footer { border-top: 1px solid var(--border); padding: 24px 0; font-size: 0.9rem; color: var(--muted); }
footer a { color: var(--muted); margin-right: 16px; }