Типовые элементы интерфейса — Меню-бургер (Burger menu)

.navbar-burger {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background-color: #ffffff;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
  position: relative;
}

.navbar-burger__brand {
  font-size: 1.25rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-dark);
  text-decoration: none;
}

.navbar-burger__toggle {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.navbar-burger__btn {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  cursor: pointer;
}

.navbar-burger__btn span {
  display: block;
  height: 2px;
  background-color: var(--color-dark);
  border-radius: 1px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.navbar-burger__menu {
  display: none;
  flex-direction: column;
  list-style: none;
  margin: 0;
  padding: 0.5rem 0 0;
  width: 100%;
  border-top: 1px solid #e9ecef;
}

.navbar-burger__menu a {
  display: block;
  padding: 0.75rem 0.25rem;
  text-decoration: none;
  color: var(--color-dark);
  font-weight: var(--font-weight-semibold);
}

.navbar-burger__menu a.is-active,
.navbar-burger__menu a:hover {
  color: var(--color-primary);
}

.navbar-burger__toggle:checked ~ .navbar-burger__menu {
  display: flex;
}

.navbar-burger__toggle:checked + .navbar-burger__btn span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.navbar-burger__toggle:checked + .navbar-burger__btn span:nth-child(2) {
  opacity: 0;
}

.navbar-burger__toggle:checked + .navbar-burger__btn span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (min-width: 768px) {
  .navbar-burger {
    flex-wrap: nowrap;
    padding: 1rem 2rem;
  }

  .navbar-burger__btn {
    display: none;
  }

  .navbar-burger__menu {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 1.5rem;
    width: auto;
    border-top: none;
    padding: 0;
  }

  .navbar-burger__menu a {
    padding: 0;
  }
}