:root {
  --text: #1f2937;
  --muted: #6b7280;
  --accent: #2563eb;
  --bg: #ffffff;
}

* { box-sizing: border-box; }

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

.site-header, main, .site-footer {
  max-width: 42rem;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.site-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding-top: 1.5rem;
  padding-bottom: 1.5rem;
}

.site-title {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
  text-decoration: none;
}

.site-header nav a {
  margin-left: 1rem;
  color: var(--muted);
  text-decoration: none;
}

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

.prose h1 { font-size: 2rem; line-height: 1.2; }

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

.site-footer {
  margin-top: 4rem;
  padding-top: 1.5rem;
  padding-bottom: 2rem;
  color: var(--muted);
  font-size: 0.875rem;
  border-top: 1px solid #e5e7eb;
}