:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #6b6b6b;
  --border: #e2e2e2;
  --accent: #2b6cb0;
  --surface: #f7f7f7;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1c1e;
    --fg: #f5f5f7;
    --muted: #a1a1a6;
    --border: #3a3a3c;
    --accent: #5e9ed6;
    --surface: #2c2c2e;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, "SF Pro Text", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 16px;
  line-height: 1.55;
}

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 48px 20px 80px;
}

header {
  margin-bottom: 32px;
}

h1 {
  font-size: 1.75rem;
  font-weight: 600;
  margin: 0 0 4px;
}

.tagline {
  color: var(--muted);
  margin: 0;
}

h2 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 32px 0 8px;
}

h3 {
  font-size: 1rem;
  font-weight: 600;
  margin: 20px 0 4px;
}

p {
  margin: 0 0 12px;
}

ul {
  margin: 0 0 12px;
  padding-left: 22px;
}

li {
  margin-bottom: 4px;
}

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

a:hover {
  text-decoration: none;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.9em;
  background: var(--surface);
  padding: 1px 6px;
  border-radius: 4px;
}

.meta {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.nav {
  display: flex;
  gap: 16px;
  font-size: 0.95rem;
  margin-top: 8px;
}

.cta {
  display: flex;
  gap: 12px;
  margin: 24px 0;
}

.cta a {
  display: inline-block;
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  text-decoration: none;
  color: var(--fg);
  background: var(--surface);
}

.cta a:hover {
  border-color: var(--accent);
  color: var(--accent);
}