header {
  background: var(--background-opaque);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.1);
  backdrop-filter: blur(8px);
}
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 4rem;
}
.nav__logo {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-mint-pink-bright);
}
.nav__menu {
  display: flex;
  gap: 2rem;
  font-weight: 500;
}
.nav__menu a {
  position: relative;
  padding-bottom: 0.25rem;
}
.nav__menu a:hover::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--color-mint-pink-dark);
}
.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 1.5rem;
  height: 1.25rem;
  background: transparent;
  border: none;
  cursor: pointer;
}
.nav__toggle-bar {
  display: block;
  height: 2px;
  background: var(--color-mint-pink-dark);
  border-radius: 1px;
  transition: transform 0.3s, opacity 0.3s;
}
.nav__toggle--active .nav__toggle-bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.nav__toggle--active .nav__toggle-bar:nth-child(2) {
  opacity: 0;
}
.nav__toggle--active .nav__toggle-bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}
@media (max-width: 768px) {
  .nav__toggle {
    display: flex;
  }
  .nav__menu {
    position: absolute;
    top: 4rem; right: 0; left: 0;
    background: var(--color-white);
    flex-direction: column;
    gap: 1rem;
    padding: 1rem 2rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transform: translateY(-200%);
    opacity: 0;
    transition: transform 0.3s ease, opacity 0.3s ease;
  }
  .nav__menu--active {
    transform: translateY(0);
    opacity: 1;
  }
}