/* IADU Navigation */

/* ─── Site Header ─────────────────────────────────────────── */

.iadu-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--nav-z);
  height: var(--nav-height);
  background-color: var(--nav-bg);
  border-bottom: 1px solid var(--nav-border);
  display: flex;
  align-items: center;
  transition: box-shadow 0.2s ease;
}

.iadu-header.is-scrolled {
  box-shadow: 0 2px 16px rgba(0,0,0,0.35);
}

.iadu-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--section-x);
  gap: var(--space-8);
}

/* ─── Logo ────────────────────────────────────────────────── */

.iadu-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  flex-shrink: 0;
}

.iadu-logo__text {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text-on-dark);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  line-height: 1.2;
}

.iadu-logo__sub {
  font-size: 0.65rem;
  font-weight: 400;
  color: var(--color-text-on-dark-2);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  display: block;
}

.iadu-logo:hover .iadu-logo__text {
  color: var(--color-accent-light);
}

/* ─── Primary Nav ─────────────────────────────────────────── */

.iadu-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  flex: 1;
}

.iadu-nav__item {
  position: relative;
}

.iadu-nav__link {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text-on-dark);
  text-decoration: none;
  border-radius: var(--radius);
  transition: background-color var(--transition), color var(--transition);
  white-space: nowrap;
}

.iadu-nav__link:hover,
.iadu-nav__link--active {
  color: var(--color-text-on-dark);
  background-color: var(--color-dark-3);
}

.iadu-nav__link .icon {
  width: 14px;
  height: 14px;
  transition: transform var(--transition);
}

.iadu-nav__item--open .iadu-nav__link .icon {
  transform: rotate(180deg);
}

/* ─── Mega Menu ───────────────────────────────────────────── */

.iadu-mega {
  position: absolute;
  top: calc(100% + var(--space-2));
  left: 0;
  min-width: 280px;
  background-color: var(--color-dark-2);
  border: 1px solid var(--color-dark-border);
  border-radius: var(--radius-lg);
  padding: var(--space-3);
  box-shadow: var(--shadow-xl);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition:
    opacity var(--transition-med),
    visibility var(--transition-med),
    transform var(--transition-med);
  z-index: calc(var(--nav-z) + 1);
}

.iadu-nav__item--open .iadu-mega,
.iadu-nav__item:focus-within .iadu-mega {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.iadu-mega__link {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-3);
  border-radius: var(--radius);
  text-decoration: none;
  transition: background-color var(--transition);
}

.iadu-mega__link:hover {
  background-color: var(--color-dark-3);
}

.iadu-mega__link-title {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-on-dark);
  display: block;
  margin-bottom: var(--space-1);
}

.iadu-mega__link-desc {
  font-size: var(--text-xs);
  color: var(--color-text-on-dark-2);
  display: block;
  line-height: 1.4;
}

.iadu-mega__icon {
  width: 32px;
  height: 32px;
  background-color: var(--color-dark-3);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--color-accent);
}

.iadu-mega__icon .icon {
  width: 16px;
  height: 16px;
}

/* ─── Nav Right (search + social) ────────────────────────── */

.iadu-nav-right {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.iadu-nav-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  color: var(--color-text-on-dark-2);
  border-radius: var(--radius);
  transition: color var(--transition), background-color var(--transition);
  text-decoration: none;
}

.iadu-nav-icon:hover {
  color: var(--color-text-on-dark);
  background-color: var(--color-dark-3);
}

.iadu-nav-icon .icon {
  width: 18px;
  height: 18px;
}

/* Search trigger */
.iadu-nav-search {
  background: none;
  border: none;
  cursor: pointer;
}

/* ─── Mobile hamburger ────────────────────────────────────── */

.iadu-nav-hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
}

.iadu-nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text-on-dark);
  border-radius: 2px;
  transition: transform var(--transition-med), opacity var(--transition-med);
}

.iadu-nav-hamburger.is-open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.iadu-nav-hamburger.is-open span:nth-child(2) {
  opacity: 0;
}
.iadu-nav-hamburger.is-open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ─── Mobile nav drawer ───────────────────────────────────── */

.iadu-mobile-nav {
  display: block;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-dark);
  z-index: calc(var(--nav-z) - 1);
  overflow-y: auto;
  padding: var(--space-6) var(--section-x);
  transform: translateX(-100%);
  transition: transform var(--transition-slow);
}

.iadu-mobile-nav.is-open {
  transform: translateX(0);
}

.iadu-mobile-nav__link {
  display: block;
  padding: var(--space-4) 0;
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-text-on-dark);
  border-bottom: 1px solid var(--color-dark-border);
  text-decoration: none;
}

.iadu-mobile-nav__link:hover {
  color: var(--color-accent-light);
}

/* ─── Responsive ──────────────────────────────────────────── */

@media (max-width: 1024px) {
  .iadu-nav { display: none; }
}