header {
  padding: 22px 42px;
  gap: 32px;
}

header .brand {
  display: block;
  flex: 0 0 auto;
  line-height: 0;
}

header nav {
  justify-content: flex-end;
  gap: 30px;
  white-space: nowrap;
}

header nav > a:not(.book) {
  color: #4c6670;
}

header nav > a[aria-current="page"] {
  color: #183d49;
  font-weight: 700;
}

.book {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #183d49;
  color: #fff;
  padding: 13px 19px;
  font-weight: 600;
  line-height: 1.4;
}

.book:hover {
  background: #2b5967;
}

@media (max-width: 760px) {
  header {
    padding: 14px 20px;
    gap: 14px;
  }

  header img {
    width: 135px;
  }

  header nav {
    gap: 0;
  }

  header nav > a:not(.book) {
    display: none;
  }

  header nav > a.book {
    display: inline-flex;
  }

  .book {
    padding: 10px 12px;
    font-size: 14px;
  }
}