*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: #1a1a1a;
  color: #ffffff;
  display: grid;
  place-items: center;
  padding: 2rem 1.5rem;
}

.card {
  width: min(100%, 480px);
  background: #262626;
  border-radius: 14px;
  padding: 2.5rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

h1 {
  margin: 0 0 0.75rem;
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.2;
}

.subtitle {
  margin: 0 0 2rem;
  color: #a0a0a0;
  font-size: 0.95rem;
  line-height: 1.5;
}

form {
  display: grid;
  gap: 1.5rem;
}

.field {
  display: grid;
  gap: 0.5rem;
}

label {
  font-size: 0.875rem;
  font-weight: 400;
  color: #a0a0a0;
}

input {
  width: 100%;
  padding: 0.9rem 1rem;
  border: none;
  border-radius: 8px;
  background: #404040;
  color: #ffffff;
  font-size: 1rem;
  letter-spacing: 0.06em;
}

input::placeholder {
  color: #8a8a8a;
}

input:focus {
  outline: 2px solid #666666;
  outline-offset: 0;
}

button {
  width: 100%;
  padding: 0.95rem 1rem;
  border: none;
  border-radius: 8px;
  background: #000000;
  color: #ffffff;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
}

button:hover {
  background: #111111;
}

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

.result {
  margin: 1.25rem 0 0;
  font-size: 0.95rem;
  text-align: center;
}

.result.hidden {
  display: none;
}

.result.verified {
  color: #7dcea0;
}

.result.invalid {
  color: #d98880;
}

.result.error {
  color: #d4ac6e;
}