* {
  box-sizing: border-box;
  font-family: Arial, sans-serif;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, #0f766e, #1d4ed8);
  padding: 20px;
}

.card {
  width: 100%;
  max-width: 460px;
  background: white;
  border-radius: 24px;
  padding: 24px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

h1 {
  margin-bottom: 8px;
}

.password-box {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  margin: 18px 0;
}

input[type="text"] {
  padding: 14px;
  border: 1px solid #cbd5e1;
  border-radius: 12px;
  font-size: 1rem;
}

button {
  border: none;
  border-radius: 12px;
  padding: 12px 16px;
  cursor: pointer;
  font-weight: bold;
}

#copy {
  background: #0f172a;
  color: white;
}

.generate-btn {
  width: 100%;
  margin-top: 18px;
  background: #2563eb;
  color: white;
}

.options {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.message {
  margin-top: 16px;
  color: #0f766e;
  min-height: 20px;
}