* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: linear-gradient(135deg, #1e293b, #0f172a);
  color: #e2e8f0;
}

.card {
  text-align: center;
  padding: 3rem 2.5rem;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.05);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
}

h1 {
  margin: 0 0 0.5rem;
  font-size: 1.8rem;
}

.subtitle {
  margin: 0 0 2rem;
  color: #94a3b8;
  font-size: 0.95rem;
}

button {
  font-size: 1.1rem;
  padding: 0.8rem 2rem;
  border: none;
  border-radius: 10px;
  background: #f59e0b;
  color: #1e293b;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.1s ease, background 0.2s ease;
}

button:hover {
  background: #fbbf24;
  transform: translateY(-2px);
}

button:active {
  transform: translateY(0);
}

output {
  display: block;
  margin-top: 1.5rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 1.05rem;
  color: #34d399;
  min-height: 1.4em;
  word-break: break-all;
}