:root {
  --bg: #f7f7f8;
  --card: #ffffff;
  --text: #1c1c1e;
  --muted: #6e6e73;
  --border: #e5e5ea;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --card: #1c1c1e;
    --text: #f2f2f7;
    --muted: #98989f;
    --border: #2c2c2e;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 16px;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.5 -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
}

main {
  width: 100%;
  max-width: 420px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px 24px;
}

h1 { font-size: 24px; margin: 0 0 12px; }
p { margin: 0 0 12px; }
p:last-child { margin-bottom: 0; }
.muted { color: var(--muted); font-size: 15px; }
[hidden] { display: none; }