:root {
  font-family: system-ui, sans-serif;
  color: #e8eaed;
  background: #0f1419;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.card {
  width: min(100% - 2rem, 22rem);
  padding: 1.5rem;
  border-radius: 12px;
  background: #1a2332;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
}

h1 {
  margin: 0 0 0.25rem;
  font-size: 1.25rem;
  font-weight: 600;
}

p.sub {
  margin: 0 0 1.25rem;
  font-size: 0.875rem;
  color: #9aa0a6;
}

label {
  display: block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #9aa0a6;
  margin-bottom: 0.35rem;
}

input {
  width: 100%;
  box-sizing: border-box;
  padding: 0.6rem 0.75rem;
  border: 1px solid #3d4f66;
  border-radius: 8px;
  background: #0f1419;
  color: inherit;
  font-size: 1rem;
}

input:focus {
  outline: 2px solid #5c9ce6;
  border-color: transparent;
}

button {
  margin-top: 1rem;
  width: 100%;
  padding: 0.65rem 1rem;
  border: none;
  border-radius: 8px;
  background: #3b82f6;
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
}

button:hover {
  background: #2563eb;
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

#out {
  margin-top: 1rem;
  min-height: 1.25rem;
  font-size: 0.9rem;
  color: #a7f3d0;
}

#out.err {
  color: #fca5a5;
}