/* Minimal, readable defaults with light/dark support */
:root {
  --bg: #ffffff;
  --fg: #0b0b0b;
  --muted: #555;
  --btn-bg: #2563eb;
  --btn-fg: #ffffff;
  --btn-bg-hover: #1d4ed8;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c0c0c;
    --fg: #f5f5f5;
    --muted: #b7b7b7;
  }
}

* { box-sizing: border-box; }
html, body {
  height: 100%;
}
body {
  margin: 0;
  font: 16px/1.5 system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  color: var(--fg);
  background: var(--bg);
  display: grid;
  place-items: center;
  padding: 24px;
}

main {
  width: 100%;
  max-width: 520px;
  text-align: center;
}

h1 {
  margin: 0 0 8px;
  font-size: 1.75rem;
}

p { margin: 0 0 16px; color: var(--muted); }

a {
  display: inline-block;
  text-decoration: none;
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-weight: 600;
  transition: background 0.2s ease;
}
a:hover, a:focus { background: var(--btn-bg-hover); }

small.note { display:block; margin-top: 10px; opacity: .8; }