body {
  font-family: system-ui, sans-serif;
  background: #0f172a;
  color: #e2e8f0;
  margin: 0;
}
header {
  background: #1e293b;
  padding: 1rem;
}
nav a {
  color: #e2e8f0;
  margin-right: 1rem;
  text-decoration: none;
}
main {
  padding: 2rem;
}
label {
  display: block;
  margin-top: 1rem;
}
input, button {
  padding: .4rem;
  margin-top: .5rem;
}
button {
  background: #0ea5e9;
  border: none;
  color: #0f172a;
  border-radius: 6px;
  cursor: pointer;
}
button:hover {
  background: #38bdf8;
}