:root {
  color-scheme: light dark;
  --bg: #f5f5f7;
  --text: #1d1d1f;
  --muted: #5f5f66;
  --line: #d9d9de;
  --accent: #0a66d8;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111114;
    --text: #f5f5f7;
    --muted: #a5a5ad;
    --line: #34343a;
    --accent: #4d9bff;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 16px;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.45 -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
}

main { width: 100%; max-width: 440px; text-align: center; }
h1 { margin: 0 0 8px; font-size: 28px; line-height: 1.2; }
h2 { margin: 0 0 6px; font-size: 17px; }
p { margin: 0 0 12px; color: var(--muted); }
.fine { font-size: 14px; }
[hidden] { display: none !important; }

.button {
  display: block;
  margin: 20px 0 28px;
  padding: 14px 20px;
  border-radius: 12px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  text-decoration: none;
}

@media (prefers-color-scheme: dark) {
  .button { color: #08111f; }
}

#help { margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--line); }