body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  background: #191933;
  color: #eee;
  max-width: 760px;
  margin: 0 auto;
  padding: 24px 16px 60px;
  line-height: 1.6;
}
h1 { color: #ffd23f; }
h2 { color: #39c5ff; margin-top: 1.6em; }
a { color: #ff5da2; }
.back { display: inline-block; margin-bottom: 20px; }
footer { margin-top: 40px; font-size: 13px; opacity: 0.6; }