header .logo img {
  width: 10rem;
  height: 8rem;
}

header {
  position: sticky;
  /* Position sticky: serve para fixar algo no topo (uso OBRIGATÓRIO no iphone para n bugar o menu)*/
  inset: 0 0 auto 0;
  z-index: 10;
  box-shadow: 0 0 5px #ccc;
  background-color: var(--background);
}

header .banner {
  display: block;
  background-color: var(--thirdground);
  text-align: center;
  padding: 1rem 2rem;
  color: var(--background);
  text-decoration: none;
}

header .banner:hover {
  opacity: 0.8;
}

header .area {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2rem;
}

header .menu-opener {
  width: 2.5rem;
  height: 2.5rem;
  cursor: pointer;
}

header .hamburger-icon {
  display: flex;
  height: 100%;
  flex-direction: column;
  justify-content: space-between;
}

header .hamburger-icon span {
  display: block;
  width: 100%;
  height: 0.2rem;
  background-color: var(--secondary);
}

header .close-icon {
  display: none;
  height: 100%;
  flex-direction: column;
  justify-content: center;
  position: relative;
}

header .close-icon span {
  position: absolute;
  display: block;
  width: 100%;
  height: 0.2rem;
  background-color: var(--secondary);
}

header .close-icon span:first-child {
  transform: rotate(45deg);
}

header .close-icon span:last-child {
  transform: rotate(-45deg);
}

header nav {
  background-color: var(--background);
  color: var(--secondary);
  overflow-y: hidden;
  max-height: 0;
  transition: all ease 0.5s;
}

header nav.opened {
  max-height: 100vh;
}

header nav ul {
  display: flex;
  flex-direction: column;
  padding-bottom: 2rem;
}

header nav li {
  padding: 1rem 2rem;
}

header nav a {
  color: var(--secondary);
  text-decoration: none;
  font-size: 2rem;
}

header nav a:hover {
  opacity: 0.8;
}

header nav a.bold {
  font-weight: bold;
}

@media (width>900px) {
  header .menu-opener {
    display: none;
  }

  header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  header nav {
    max-height: 100vh;
  }

  header nav ul {
    flex-direction: row;
    padding-bottom: 0;
  }
}