:root {
  color-scheme: dark;
  --bg: #0f1419;
  --card: #1a2332;
  --text: #e7ecf3;
  --muted: #9aa8bc;
  --accent: #3d8bfd;
  --border: #2a3a52;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: system-ui, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.card {
  max-width: 32rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.75rem 2rem;
  line-height: 1.5;
}

h1 {
  margin: 0 0 0.75rem;
  font-size: 1.5rem;
}

.lead {
  color: var(--muted);
  margin-top: 0;
}

ol {
  padding-left: 1.25rem;
  margin: 1rem 0;
}

code {
  font-size: 0.9em;
  background: #0b1018;
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

.actions {
  margin: 1.25rem 0 0;
}

.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  padding: 0.65rem 1.1rem;
  border-radius: 8px;
  font-weight: 600;
}

.hint {
  color: var(--muted);
  font-size: 0.9rem;
}

footer {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
}

footer a {
  color: var(--muted);
}

.hidden {
  display: none;
}