/* ============================================================
   Mega-Menu Navigation
   Desktop (≥1024px): horizontal bar with hover flyout panels
   Mobile (<1024px): left-sliding drawer with accordion submenus
   ============================================================ */

/* ---- Drawer container (wraps header + nav list) ---- */
.mega-drawer {
  display: contents; /* On desktop, behaves as if not there */
}

/* ---- Nav list (shared) ---- */
.mega-nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 0;
}

.mega-nav-item {
  position: relative;
}

/* ---- Nav item row (link + expand button) ---- */
.mega-nav-item-row {
  display: contents; /* On desktop, children lay out as if row doesn't exist */
}

/* ---- Nav link ---- */
.mega-nav-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-body);
  text-decoration: none;
  background: none;
  border: none;
  cursor: pointer;
  white-space: nowrap;
  font-family: inherit;
  transition: color var(--transition-fast);
}

.mega-nav-link:hover,
.mega-nav-link.active {
  color: var(--color-primary);
}

/* ---- Expand button (chevron) ---- */
.mega-expand-btn {
  display: none; /* Hidden on desktop by default */
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-muted);
  padding: var(--space-sm);
  transition: color var(--transition-fast);
}

.mega-expand-btn:hover {
  color: var(--color-heading);
}

.mega-chevron {
  font-size: 0.75em;
  transition: transform var(--transition-fast);
}

.mega-nav-item.expanded .mega-chevron {
  transform: rotate(90deg);
}

/* ---- Account Button (header) ---- */
.header-account-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  font-size: 1.25rem;
  color: var(--color-heading);
  text-decoration: none;
  transition: background var(--transition-fast), color var(--transition-fast);
  margin-left: auto;
  flex-shrink: 0;
}

.header-account-btn:hover {
  background: var(--color-bg-alt);
  color: var(--color-primary);
}

/* Sign-in item in mobile drawer — hidden on desktop */
.mega-nav-item--signin {
  display: none;
}

/* ---- Hamburger ---- */
.mega-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
}

.mega-hamburger-line {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-heading);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.mega-hamburger[aria-expanded="true"] .mega-hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.mega-hamburger[aria-expanded="true"] .mega-hamburger-line:nth-child(2) {
  opacity: 0;
}
.mega-hamburger[aria-expanded="true"] .mega-hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---- Drawer header (mobile only, hidden on desktop) ---- */
.mega-drawer-header {
  display: none;
}

/* ---- Desktop Flyout Panel ---- */
.mega-panel {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 240px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-dropdown);
  padding: var(--space-sm) 0;
}

.mega-nav-item.open > .mega-panel {
  display: block;
}

.mega-panel-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.mega-panel-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--font-size-sm);
  color: var(--color-body);
  text-decoration: none;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.mega-panel-link:hover,
.mega-panel-link.active {
  background: var(--color-bg-alt);
  color: var(--color-primary);
}

.mega-panel-link i {
  font-size: var(--font-size-base);
  color: var(--color-muted);
  width: 20px;
  text-align: center;
  flex-shrink: 0;
}

.mega-panel-link:hover i,
.mega-panel-link.active i {
  color: var(--color-primary);
}

/* ---- Mobile Overlay ---- */
.mega-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: calc(var(--z-header) - 1);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.mega-overlay.open {
  display: block;
  opacity: 1;
}

/* ============================================================
   Mobile (<1024px) — Left-sliding drawer
   ============================================================ */
@media (max-width: 1023px) {
  .mega-hamburger {
    display: flex;
  }

  /* Drawer container: fixed left-slide panel */
  .mega-drawer {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: min(280px, 85vw);
    background: var(--color-bg);
    z-index: var(--z-header);
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
  }

  .mega-drawer.open {
    transform: translateX(0);
  }

  /* Drawer header */
  .mega-drawer-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--color-nav, #1a365d);
    padding: var(--space-md) var(--space-lg);
    flex-shrink: 0;
  }

  .mega-drawer-logo img {
    display: block;
  }

  .mega-drawer-close {
    background: none;
    border: none;
    color: #fff;
    font-size: 1.25rem;
    cursor: pointer;
    padding: var(--space-xs);
    line-height: 1;
  }

  /* Nav list: vertical stack */
  .mega-nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-sm) 0;
  }

  /* Nav item row: flex with link + expand button side by side */
  .mega-nav-item-row {
    display: flex;
    align-items: center;
    border-bottom: 1px solid #f0f0f0;
  }

  .mega-nav-link {
    flex: 1;
    padding: var(--space-md) var(--space-lg);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--color-heading);
  }

  /* Simple items (no children) also get a border */
  .mega-nav-item:not(.has-children) {
    border-bottom: 1px solid #f0f0f0;
  }

  /* Show expand button on mobile */
  .mega-expand-btn {
    display: flex;
    width: 50px;
    height: 48px;
    background: var(--color-bg-alt);
    border-left: 1px solid #e2e8f0;
    color: var(--color-muted);
    font-size: 1rem;
    transition: background var(--transition-fast), color var(--transition-fast);
  }

  .mega-expand-btn:hover {
    background: #e2e8f0;
    color: var(--color-heading);
  }

  /* Panel as accordion: max-height transition */
  .mega-panel {
    position: static;
    border: none;
    border-radius: 0;
    box-shadow: none;
    background: var(--color-bg-alt);
    min-width: unset;
    display: block;
    max-height: 0;
    overflow: hidden;
    padding: 0;
    transition: max-height 0.3s ease;
  }

  /* Desktop .open class doesn't override on mobile; use .expanded */
  .mega-nav-item.open > .mega-panel {
    display: block;
    max-height: 0;
  }

  .mega-nav-item.expanded > .mega-panel {
    max-height: 500px;
  }

  .mega-panel-list {
    padding: var(--space-sm) 0;
  }

  .mega-panel-link {
    padding: var(--space-sm) var(--space-lg) var(--space-sm) var(--space-2xl);
    font-size: var(--font-size-sm);
  }

  /* Show sign-in link in mobile drawer */
  .mega-nav-item--signin {
    display: list-item;
  }

  /* Hide account icon button in mobile (sign-in is in drawer instead) */
  .header-account-btn {
    display: none;
  }
}

/* ============================================================
   Desktop (≥1024px) — Flyout positioning tweaks
   ============================================================ */
@media (min-width: 1024px) {
  /* Last couple items: align panel to right edge to avoid overflow */
  .mega-nav-item:nth-last-child(-n+2).has-children > .mega-panel {
    left: auto;
    right: 0;
  }
}