* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: #f4f5f7;
  color: #1a1a1a;
  display: flex;
  justify-content: center;
  min-height: 100vh;
  padding: 2rem 1rem;
}

.container {
  width: 100%;
  max-width: 600px;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
  padding: 2rem;
}

h1 {
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
}

.subtitle {
  color: #555;
  line-height: 1.5;
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
}

.subtitle code {
  background: #eee;
  padding: 0.1rem 0.3rem;
  border-radius: 4px;
  font-size: 0.85em;
}

.banner {
  background: #eef2ff;
  border: 1px solid #e0e7ff;
  color: #4338ca;
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  font-size: 0.85rem;
  margin-bottom: 1.5rem;
}

.password {
  width: 100%;
  padding: 0.65rem 0.85rem;
  font-size: 1rem;
  border: 1px solid #ccc;
  border-radius: 8px;
  outline: none;
  margin-bottom: 0.75rem;
  transition: border-color 0.15s;
}

.password:focus {
  border-color: #4f46e5;
}

.input-row {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

#user-prompt {
  flex: 1;
  padding: 0.65rem 0.85rem;
  font-size: 1rem;
  border: 1px solid #ccc;
  border-radius: 8px;
  outline: none;
  transition: border-color 0.15s;
}

#user-prompt:focus {
  border-color: #4f46e5;
}

#button {
  padding: 0.65rem 1.25rem;
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  background: #4f46e5;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s;
  white-space: nowrap;
}

#button:hover {
  background: #4338ca;
}

#button:disabled {
  background: #a5a5d6;
  cursor: not-allowed;
}

#response {
  display: block;
  min-height: 1.5rem;
  padding: 1rem;
  background: #f9f9fb;
  border: 1px solid #eee;
  border-radius: 8px;
  line-height: 1.6;
  white-space: pre-wrap;
}

#response.error {
  background: #fef2f2;
  border-color: #fecaca;
  color: #b91c1c;
}

.spinner {
  display: inline-block;
  width: 1.1rem;
  height: 1.1rem;
  border: 2px solid #ccc;
  border-top-color: #4f46e5;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: middle;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}