:root {
  --text-color: #333;
  --bg-color: #fff;
  --link-color: #0056b3;
  --font-stack: system-ui, -apple-system, sans-serif;
  --spacing: 1.5rem;
}
@media (prefers-color-scheme: dark) {
  :root { --text-color: #f4f4f4; --bg-color: #1a1a1a; --link-color: #6bb9f0; }
}
body { font-family: var(--font-stack); color: var(--text-color); background: var(--bg-color); line-height: 1.6; margin: 0; padding: var(--spacing); }
header, main, footer { max-width: 800px; margin: 0 auto; padding: 1rem 0; }
nav a { margin-right: 1rem; color: var(--link-color); text-decoration: none; display: inline-block; padding: 10px 0; }
h1, h2 { margin-top: 2rem; }
p { margin-bottom: 1rem; }
form { margin: 2rem 0; border: 1px solid #ccc; padding: 1rem; border-radius: 4px; }
input[type="email"] { padding: 10px; width: 100%; max-width: 300px; margin: 0.5rem 0; box-sizing: border-box; }
button { padding: 10px 20px; cursor: pointer; }
textarea { width: 100%; height: 100px; margin-top: 1rem; }
@media (prefers-reduced-motion: reduce) { *, ::before, ::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; } }