/* ==========================================================================
   ESTILOS CLÁSICOS DE INTERFAZ Y ESTAMPILLADO
   ========================================================================== */
body {
  background-color: #0b0b0d;
  color: #e0e0e0;
  text-align: center;
  font-family: "Courier New", Courier, monospace;
  margin: 0;
  padding: 20px;
}

h2 {
  color: #ffffff;
  letter-spacing: 1px;
  margin-bottom: 12px;
}

.controls {
  margin-bottom: 15px;
}

button {
  background: #1a73e8;
  color: #ffffff;
  border: 1px solid #1557b0;
  padding: 8px 18px;
  font-family: inherit;
  font-size: 14px;
  font-weight: bold;
  cursor: pointer;
  border-radius: 2px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.4);
}

button:hover {
  background: #1557b0;
}

canvas {
  background: #000000;
  border: 1px solid #333333;
  box-shadow: 0 0 20px rgba(0, 255, 200, 0.08);
  display: block;
  margin: 0 auto 15px auto;
}

/* Panel de Estampillado */
.stamp-box {
  display: inline-block;
  background: #16181d;
  border: 1px solid #282c34;
  padding: 8px 16px;
  border-radius: 4px;
  font-size: 13px;
}

.stamp-item {
  color: #00e676;
  font-weight: bold;
}

.stamp-label {
  color: #8b949e;
  margin-right: 6px;
}

button:disabled {
  background-color: #2a2d34;
  color: #6c757d;
  border-color: #343a40;
  cursor: not-allowed;
  box-shadow: none;
}