:root {
  --bg-color: #ffffff;
  --text-color: #333333;
  --link-color: #2a5db0;
  --spacing: 1rem;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #1a1a1a;
    --text-color: #e0e0e0;
    --link-color: #6a9bd6;
  }
}
body {
  font-family: system-ui, sans-serif;
  line-height: 1.6;
  background-color: var(--bg-color);
  color: var(--text-color);
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing);
}
header, footer {
  padding: var(--spacing) 0;
}
main {
  min-height: 70vh;
}
nav a {
  margin-right: 1rem;
  color: var(--link-color);
}
button {
  padding: 0.5rem 1rem;
  min-height: 44px;
}
input {
  min-height: 44px;
  display: block;
  margin-bottom: 0.5rem;
}
footer {
  font-size: 0.9rem;
  border-top: 1px solid #ccc;
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition: none !important;
  }
}