/* ============================================
   MENA — Navigation
   Hamburger menu + full-screen overlay
   ============================================ */

/* ---------- Hamburger Button ---------- */
.hamburger {
  position: fixed;
  top: var(--space-md);
  right: var(--space-md);
  z-index: 200;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 48px;
  height: 48px;
  padding: 12px;
  background: transparent;
  border: 1px solid var(--surface-border);
  cursor: pointer;
  transition: border-color 0.3s ease;
}

.hamburger:hover {
  border-color: var(--accent);
}

.hamburger:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* Hamburger lines */
.hamburger-line {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition:
    transform 0.4s var(--ease-out-expo),
    opacity 0.3s ease,
    background 0.3s ease;
}

.hamburger-line:nth-child(1) {
  transform: translateY(-6px);
}

.hamburger-line:nth-child(2) {
  transform: translateY(0);
}

.hamburger-line:nth-child(3) {
  transform: translateY(6px);
}

/* Hamburger hover state */
.hamburger:hover .hamburger-line {
  background: var(--accent);
}

/* ---------- Hamburger Open State ---------- */
.is-nav-open .hamburger-line:nth-child(1) {
  transform: translateY(0) rotate(45deg);
}

.is-nav-open .hamburger-line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.is-nav-open .hamburger-line:nth-child(3) {
  transform: translateY(0) rotate(-45deg);
}

/* ---------- Navigation Overlay ---------- */
.nav-overlay {
  position: fixed;
  inset: 0;
  z-index: 150;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(10, 10, 11, 0.98);
  opacity: 0;
  visibility: hidden;
  transition:
    opacity 0.5s var(--ease-out-expo),
    visibility 0.5s;
}

.is-nav-open .nav-overlay {
  opacity: 1;
  visibility: visible;
}

/* ---------- Navigation Menu ---------- */
.nav-menu {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

/* Menu items */
.nav-menu-item {
  font-family: var(--font-display);
  font-size: var(--text-5xl);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-primary);
  position: relative;
  opacity: 0;
  transform: translateY(30px);
  transition:
    color 0.3s ease,
    opacity 0.5s var(--ease-out-expo),
    transform 0.5s var(--ease-out-expo);
}

/* Staggered reveal */
.is-nav-open .nav-menu-item {
  opacity: 1;
  transform: translateY(0);
}

.is-nav-open .nav-menu-item:nth-child(1) {
  transition-delay: 0.1s;
}

.is-nav-open .nav-menu-item:nth-child(2) {
  transition-delay: 0.2s;
}

.is-nav-open .nav-menu-item:nth-child(3) {
  transition-delay: 0.3s;
}

/* Underline effect */
.nav-menu-item::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.4s var(--ease-out-expo);
}

.nav-menu-item:hover {
  color: var(--accent);
}

.nav-menu-item:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* Trademark styling */
.nav-menu-item .tm {
  font-size: 0.4em;
  vertical-align: super;
  opacity: 0.6;
}

/* ---------- Body Scroll Lock ---------- */
.is-nav-open {
  overflow: hidden;
}

/* ---------- Active Page Indicator ---------- */
.nav-menu-item.is-active {
  color: var(--accent);
}

.nav-menu-item.is-active::after {
  transform: scaleX(1);
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .hamburger {
    top: var(--space-sm);
    right: var(--space-sm);
    width: 44px;
    height: 44px;
    padding: 10px;
  }

  .hamburger-line {
    width: 20px;
  }

  .hamburger-line:nth-child(1) {
    transform: translateY(-5px);
  }

  .hamburger-line:nth-child(3) {
    transform: translateY(5px);
  }

  .nav-menu-item {
    font-size: var(--text-4xl);
  }
}

/* ---------- Reduced Motion ---------- */
@media (prefers-reduced-motion: reduce) {
  .hamburger-line,
  .nav-overlay,
  .nav-menu-item,
  .nav-menu-item::after {
    transition-duration: 0.01ms;
  }
}