body {
  margin: 0;
  padding: 0;
  font-family: system-ui, sans-serif;
  background: #0f172a;
  color: #e5e7eb;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.app {
  width: 420px;
  background: #020617;
  border-radius: 10px;
  padding: 16px;
  box-shadow: 0 0 40px rgba(0,0,0,0.6);
}

h1 {
  margin-top: 0;
  font-size: 18px;
  text-align: center;
}

textarea {
  width: 100%;
  box-sizing: border-box;
  background: #020617;
  color: #e5e7eb;
  border: 1px solid #334155;
  border-radius: 6px;
  padding: 8px;
  resize: none;
}

button {
  width: 100%;
  margin-top: 8px;
  padding: 10px;
  border: none;
  border-radius: 6px;
  background: #2563eb;
  color: white;
  font-weight: bold;
  cursor: pointer;
}

button:hover {
  background: #1d4ed8;
}

pre {
  margin-top: 12px;
  background: #020617;
  border: 1px solid #334155;
  border-radius: 6px;
  padding: 8px;
  min-height: 120px;
  white-space: pre-wrap;
}