.modo-apresentacao-botao {
  position: fixed;
  top: 0.7em;
  right: 1em;
  z-index: 1100;
  padding: 0.55em 0.9em;
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: 999px;
  background: rgba(0, 92, 155, 0.28);
  box-shadow: 0 2px 6px rgba(0, 62, 105, 0.2);
  color: #fff;
  font-size: 0.85em;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.modo-apresentacao-botao:hover {
  background: rgba(0, 74, 128, 0.48);
  box-shadow: 0 3px 9px rgba(0, 62, 105, 0.28);
  transform: translateY(-1px);
}

.modo-apresentacao-botao:focus {
  outline: 2px solid #168de2;
  outline-offset: 2px;
}

body.modo-apresentacao .modo-apresentacao-botao {
  border-color: #168de2;
  background: #168de2;
}

body.modo-apresentacao .modo-apresentacao-botao:hover {
  background: #0d74bd;
}

body.modo-apresentacao #header,
body.modo-apresentacao #navigation,
body.modo-apresentacao .navbar.fixed-top,
body.modo-apresentacao .col-md-3 {
  display: none;
}

body.modo-apresentacao #content,
body.modo-apresentacao .col-md-9 {
  width: auto;
  margin-left: 0;
}

body.modo-apresentacao .col-md-9 {
  width: 100%;
}