/* ── Mobile Nav Overlay ── */
.nav-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.97);
  z-index: var(--z-overlay);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  gap: var(--space-sm);
  box-sizing: border-box;
  min-height: 100dvh;
  height: 100dvh;
  padding: calc(env(safe-area-inset-top, 0px) + 4rem) var(--space-sm)
    calc(env(safe-area-inset-bottom, 0px) + var(--space-sm));
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--transition-base), visibility var(--transition-base);
  overflow-x: hidden;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
}

.nav-overlay.nav-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.nav-overlay nav {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.875rem;
  margin: auto 0;
}

.nav-overlay nav a,
.nav-overlay .nav-dropdown-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.35rem 0.75rem;
  font-family: var(--font-heading);
  font-size: clamp(1.25rem, 5vw, 1.875rem);
  font-weight: 700;
  line-height: 1.1;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-white);
  transition: color var(--transition-fast);
  background: none;
  border: none;
  cursor: pointer;
}

.nav-overlay nav a:hover,
.nav-overlay .nav-dropdown-toggle:hover,
.nav-overlay .nav-dropdown-toggle:focus-visible,
.nav-overlay .nav-dropdown-toggle.active {
  color: var(--color-red);
}

.nav-overlay .nav-item-dropdown {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  width: 100%;
}

.nav-overlay .nav-dropdown-menu {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height var(--transition-base), opacity var(--transition-fast);
  width: 100%;
}

.nav-overlay .nav-dropdown-menu a {
  min-height: 38px;
  padding: 0.2rem 0.6rem;
  font-size: clamp(0.95rem, 3.6vw, 1.15rem);
  font-weight: 500;
  line-height: 1.1;
  color: var(--color-silver);
}

.nav-overlay .nav-dropdown-menu a:hover {
  color: var(--color-white);
}

.nav-overlay .nav-item-dropdown.is-open .nav-dropdown-menu {
  max-height: 7rem;
  opacity: 1;
}

.nav-overlay .nav-item-dropdown.is-open {
  gap: 0.5rem;
}

/* Close button */
.nav-close {
  position: absolute;
  top: calc(env(safe-area-inset-top, 0px) + var(--space-sm));
  right: calc(env(safe-area-inset-right, 0px) + var(--space-sm));
  background: none;
  border: none;
  color: var(--color-silver);
  font-size: 2rem;
  cursor: pointer;
  line-height: 1;
  transition: color var(--transition-fast), transform var(--transition-fast);
  padding: var(--space-xs);
}

.nav-close:hover {
  color: var(--color-white);
  transform: rotate(90deg);
}

@media (max-height: 640px) {
  .nav-overlay {
    gap: 0.5rem;
    padding: calc(env(safe-area-inset-top, 0px) + 3rem) var(--space-xs)
      calc(env(safe-area-inset-bottom, 0px) + 0.5rem);
  }

  .nav-overlay nav {
    gap: 0.55rem;
  }

  .nav-overlay nav a,
  .nav-overlay .nav-dropdown-toggle {
    min-height: 38px;
    padding: 0.2rem 0.5rem;
    font-size: clamp(1.05rem, 4.6vw, 1.35rem);
    line-height: 1.05;
  }

  .nav-overlay .nav-dropdown-menu {
    gap: 0.35rem;
  }

  .nav-overlay .nav-dropdown-menu a {
    min-height: 32px;
    padding: 0.15rem 0.45rem;
    font-size: clamp(0.875rem, 3.4vw, 1rem);
    line-height: 1.05;
  }

  .nav-overlay .nav-item-dropdown.is-open {
    gap: 0.35rem;
  }

  .nav-close {
    top: calc(env(safe-area-inset-top, 0px) + 0.5rem);
    right: calc(env(safe-area-inset-right, 0px) + 0.5rem);
    font-size: 1.75rem;
  }
}