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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #0f172a;
  color: #e2e8f0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.container {
  max-width: 800px;
  width: 100%;
  padding: 2rem;
}

h1 {
  font-size: 2rem;
  background: linear-gradient(135deg, #818cf8, #c084fc);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0.5rem;
}

.subtitle {
  color: #94a3b8;
  margin-bottom: 2rem;
}

.cards {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1fr;
}

@media (min-width: 600px) {
  .cards {
    grid-template-columns: 1fr 1fr;
  }
  .cards .card:last-child {
    grid-column: 1 / -1;
  }
}

.card {
  background: #1e293b;
  border: 1px solid #334155;
  border-radius: 12px;
  padding: 1.5rem;
}

.card h2 {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #94a3b8;
  margin-bottom: 1rem;
}

.value {
  font-size: 1.125rem;
  color: #f1f5f9;
  margin-top: 0.75rem;
  min-height: 1.5em;
}

pre.value {
  font-size: 0.8rem;
  background: #0f172a;
  padding: 0.75rem;
  border-radius: 8px;
  overflow-x: auto;
  white-space: pre-wrap;
}

.input-group {
  display: flex;
  gap: 0.5rem;
}

input {
  flex: 1;
  padding: 0.5rem 0.75rem;
  border: 1px solid #475569;
  border-radius: 8px;
  background: #0f172a;
  color: #e2e8f0;
  font-size: 0.875rem;
}

input:focus {
  outline: none;
  border-color: #818cf8;
}

button {
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 8px;
  background: #6366f1;
  color: white;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s;
}

button:hover {
  background: #4f46e5;
}

button:active {
  background: #4338ca;
}

footer {
  margin-top: 2rem;
  text-align: center;
  color: #64748b;
  font-size: 0.8rem;
}

footer strong {
  color: #a78bfa;
}