:root {
  color-scheme: light dark;
  --bg: #0b0c10;
  --fg: #e5e7eb;
  --link: #60a5fa;
  --accent: #22d3ee;
}

html, body {
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Helvetica Neue, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: var(--bg);
  color: var(--fg);
}

header, main, footer {
  max-width: 860px;
  margin: 0 auto;
  padding: 1rem;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

nav a {
  color: var(--link);
  margin-right: 0.75rem;
  text-decoration: none;
}

nav a[aria-current="page"] {
  text-decoration: underline;
}

button {
  background: var(--accent);
  color: #001219;
  border: none;
  border-radius: 6px;
  padding: 0.6rem 0.9rem;
  cursor: pointer;
}

pre {
  background: #111827;
  border: 1px solid #1f2937;
  border-radius: 8px;
  padding: 0.75rem;
  overflow-x: auto;
}