:root {
  color-scheme: light dark;
  --bg: #f7f7f5;
  --fg: #1b1b18;
  --muted: #6b6b63;
  --accent: #3d5a45;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161614;
    --fg: #eceae4;
    --muted: #9a978d;
    --accent: #8fbf9f;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  line-height: 1.55;
}
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 2rem;
  border-bottom: 1px solid rgba(127,127,127,0.2);
}
.brand { font-weight: 700; letter-spacing: 0.02em; }
nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 1.5rem;
  font-size: 0.95rem;
}
nav a:hover { color: var(--accent); }
main {
  max-width: 38rem;
  margin: 0 auto;
  padding: 3rem 2rem 4rem;
}
h1 { font-size: 1.6rem; margin-bottom: 1.2rem; }
p { color: var(--fg); }
footer {
  text-align: center;
  padding: 2rem;
  color: var(--muted);
  font-size: 0.85rem;
}