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

.app-container {
  width: 90%;
  max-width: 500px;
  background: #1e293b;
  padding: 30px;
  border-radius: 20px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

textarea {
  width: 100%;
  height: 150px;
  background: #0f172a;
  border: 1px solid #334155;
  color: white;
  padding: 15px;
  border-radius: 12px;
  font-size: 16px;
  box-sizing: border-box;
  margin-bottom: 15px;
}

button {
  width: 100%;
  padding: 15px;
  background: linear-gradient(135deg, #6366f1, #a855f7);
  border: none;
  border-radius: 12px;
  color: white;
  font-weight: bold;
  font-size: 16px;
  cursor: pointer;
  transition: transform 0.2s;
}

button:hover { transform: scale(1.02); }
button:disabled { opacity: 0.5; cursor: wait; }

.resultado-box {
  margin-top: 20px;
  background: #0f172a;
  padding: 20px;
  border-radius: 12px;
  border-left: 4px solid #6366f1;
  line-height: 1.6;
  min-height: 50px;
}