:root { color-scheme: dark; }
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: #0b1120;
  color: #e2e8f0;
  line-height: 1.6;
}
header, main, footer { max-width: 760px; margin: 0 auto; padding: 24px; }
header { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; }
header a.brand { font-weight: 700; font-size: 1.2rem; color: #34d399; text-decoration: none; }
nav a { color: #94a3b8; margin-left: 16px; text-decoration: none; }
nav a:hover { color: #e2e8f0; }
h1 { font-size: 2rem; margin-top: 8px; }
h2 { margin-top: 32px; color: #f1f5f9; }
a { color: #34d399; }
.card { background: #111827; border: 1px solid #1f2937; border-radius: 12px; padding: 20px; margin: 16px 0; }
footer { color: #64748b; font-size: 0.9rem; border-top: 1px solid #1f2937; }
code { background: #1f2937; padding: 2px 6px; border-radius: 4px; }