body {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu;
  background: #0b0e14;
  color: #e6e6eb;
  margin: 0;
}
header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 16px 24px; background: #11152a;
}
button {
  background: #4c6fff; color: #fff; border: 0; padding: 8px 12px;
  border-radius: 8px; cursor: pointer;
}
main { padding: 24px; }
.card {
  max-width: 520px; margin: auto; background: #11152a;
  border-radius: 14px; padding: 20px;
}
.row { display: flex; justify-content: space-between; margin: 10px 0; }
footer { text-align: center; padding: 16px; color: #9aa0b4; }
small { color: #9aa0b4; }