:root {
  --bg: #ffffff;
  --text: #111;
  --accent: #0066cc;
  --border: #ddd;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121212;
    --text: #eee;
    --accent: #4ea1ff;
    --border: #333;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
}

header, footer {
  padding: 1rem;
  background: var(--accent);
  color: white;
}

nav a {
  color: white;
  margin-right: 1rem;
  text-decoration: none;
}

main {
  max-width: 900px;
  margin: auto;
  padding: 1rem;
}

article {
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
  padding-bottom: 1rem;
}

input, textarea, button {
  width: 100%;
  padding: 0.5rem;
  margin-bottom: 0.5rem;
}

button { cursor: pointer; }

footer .social a {
  margin-right: 1rem;
  color: white;
}