:root {
  --ink: #1c1c1e;
  --muted: #6e6e73;
  --line: #e5e5ea;
  --surface: #ffffff;
  --page: #f2f2f7;
}
@media (prefers-color-scheme: dark) {
  :root { --ink: #f2f2f7; --muted: #a1a1a6; --line: #38383a; --surface: #1c1c1e; --page: #000000; }
}
* { box-sizing: border-box; }
body {
  margin: 0; min-height: 100vh; display: grid; place-items: center; padding: 24px 16px;
  font: 17px/1.5 -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  color: var(--ink); background: var(--page);
}
main { width: 100%; max-width: 440px; background: var(--surface); border: 1px solid var(--line); border-radius: 20px; padding: 32px 24px; }
h1 { font-size: 28px; margin: 0 0 4px; letter-spacing: -0.02em; }
.tagline { color: var(--muted); margin: 0 0 24px; }
p { margin: 0 0 16px; }
.muted { color: var(--muted); font-size: 15px; }
.button {
  display: block; text-align: center; text-decoration: none; font-weight: 600;
  background: var(--ink); color: var(--surface); border-radius: 14px; padding: 14px 16px; margin: 24px 0 16px;
}
footer { margin-top: 24px; color: var(--muted); font-size: 13px; }