body {
  font-family: system-ui, sans-serif;
  margin: 0; padding: 0;
  background: #0f0f10; color: #fff;
}
.wrap { padding: 16px; }
.card {
  background: #1a1b1e; border-radius: 16px; padding: 20px; margin: 20px;
  box-shadow: 0 2px 10px rgba(0,0,0,.2);
}
.btn {
  display: inline-block; padding: 12px 20px;
  background: #2ea6ff; color: #000; border-radius: 12px;
  text-decoration: none; font-weight: 600;
}
.center { text-align: center; }