/* Paso 0: fondo negro, canvas centrado. Sin dependencias. */
html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: #000;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}

#terminal {
  background: #000;
  display: block;
  max-width: 95vw;
  max-height: 95vh;
  outline: 2px solid transparent;
  outline-offset: 4px;
}

#terminal:focus {
  outline-color: #33ff33;
  box-shadow: 0 0 0 1px #33ff33;
}