* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #0a0a0a;
  color: #fff;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}
.card {
  background: #141414;
  padding: 1.5rem;
  border-radius: 12px;
  width: 100%;
  max-width: 400px;
  border: 1px solid #222;
}
h1 { font-size: 1.25rem; margin-bottom: 1.25rem; text-align: center; }
input {
  width: 100%;
  padding: 12px;
  margin-bottom: 1rem;
  background: #1a1a1a;
  border: 1px solid #333;
  border-radius: 8px;
  color: #fff;
  font-size: 1rem;
}
input:focus { outline: none; border-color: #6366f1; }
input::placeholder { color: #666; }
button {
  width: 100%;
  padding: 12px;
  background: #6366f1;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
}
button:hover { background: #5558e3; }
.error {
  background: #dc2626;
  padding: 10px;
  border-radius: 8px;
  margin-bottom: 1rem;
  display: none;
  font-size: 0.875rem;
}
.info { color: #888; font-size: 0.75rem; text-align: center; margin-top: 1rem; }

@media (max-width: 480px) {
  .card { padding: 1.25rem; }
  h1 { font-size: 1.125rem; }
  input, button { padding: 14px; font-size: 1rem; }
}