:root { font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif; }
body {
  margin: 0; padding: 40px;
  background: #f6f7fb;
}
.card {
  max-width: 560px;
  background: white;
  padding: 28px;
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0,0,0,.08);
}
button {
  border: 0;
  padding: 12px 16px;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 600;
}
.muted { color: #6b7280; }
hr { border: 0; border-top: 1px solid #e5e7eb; margin: 18px 0; }