:root {
  --bg: #fafaf9;
  --text: #1c1917;
  --muted: #57534e;
  --line: #e7e5e4;
  --accent: #2563eb;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c0a09;
    --text: #f5f5f4;
    --muted: #a8a29e;
    --line: #292524;
    --accent: #60a5fa;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.wrap {
  width: 100%;
  max-width: 680px;
  margin: 0 auto;
  padding: 0 20px;
}

header .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  padding-bottom: 24px;
}

.brand {
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
  text-decoration: none;
}

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

nav a:hover { color: var(--text); }

main { flex: 1; }

.hero { padding: 72px 0 48px; }

h1 {
  font-size: clamp(34px, 7vw, 52px);
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin: 0 0 16px;
}

.lede {
  font-size: 20px;
  color: var(--muted);
  margin: 0 0 32px;
}

.button {
  display: inline-block;
  background: var(--text);
  color: var(--bg);
  padding: 12px 20px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
}

section { padding: 32px 0; border-top: 1px solid var(--line); }

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

h3 { font-size: 18px; margin: 28px 0 8px; }

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

.doc { padding: 48px 0; }
.doc h1 { font-size: 36px; }
.meta { color: var(--muted); margin-top: 0; }

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

footer .wrap {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 20px;
  padding-top: 24px;
  padding-bottom: 32px;
}

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