:root {
  --max-width: 720px;
  --color-text: #1a1a1a;
  --color-muted: #6a6a6a;
  --color-accent: #0066cc;
  --color-bg: #fafafa;
  --color-border: #e6e6e6;
  --color-code-bg: #f0f0f0;
  --font-mono: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  padding: 2rem 1rem;
}

header {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

header nav {
  display: flex;
  gap: 1.5rem;
  align-items: baseline;
  flex-wrap: wrap;
}

header nav .brand {
  font-weight: 600;
  font-family: var(--font-mono);
  margin-right: auto;
}

header nav a {
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.95rem;
}

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

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 0;
}

h1 {
  font-size: 1.8rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

h2 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
}

h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-top: 1.75rem;
  margin-bottom: 0.5rem;
}

p { margin-bottom: 1rem; }

a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

a:hover { text-decoration-thickness: 2px; }

ul {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

li { margin-bottom: 0.3rem; }

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--color-code-bg);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

strong { font-weight: 600; }

.hero h1 {
  font-size: 2.4rem;
  line-height: 1.2;
  margin-bottom: 2rem;
  letter-spacing: -0.02em;
}

.hero p { font-size: 1.05rem; }

footer {
  max-width: var(--max-width);
  margin: 4rem auto 0;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 0.9rem;
}

footer p { margin-bottom: 0.4rem; }
footer a { color: var(--color-muted); }
footer a:hover { color: var(--color-accent); }