:root {
  --bg-color: #fdfdfd;
  --text-color: #333;
  --accent-color: #2e7d32;
  --font-family: system-ui, -apple-system, sans-serif;
}
body {
  font-family: var(--font-family);
  background: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  max-width: 800px;
  margin: 0 auto;
  padding: 1rem;
}
header, footer {
  padding: 1rem 0;
  border-bottom: 1px solid #ccc;
}
footer { border-top: 1px solid #ccc; border-bottom: none; font-size: 0.9rem; }
a { color: var(--accent-color); }
nav a { margin-right: 1rem; text-decoration: none; }
h1 { font-size: 2rem; }
textarea { width: 100%; height: 100px; }
@media (prefers-color-scheme: dark) {
  :root { --bg-color: #121212; --text-color: #e0e0e0; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }