/* ============================================================
   IsoAcoustics Japan - Mega Menu Stylesheet
   Dropdown navigation for HOME AUDIO and ABOUT sections
   ============================================================ */

/* ------------------------------------------------------------
   1. MEGA MENU CONTAINER (shared)
   ------------------------------------------------------------ */

.mega-menu {
  position: fixed;
  top: var(--header-height, 80px);
  left: 0;
  right: 0;
  background-color: var(--iso-white, #ffffff);
  border-top: 3px solid var(--iso-green, #12b051);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity 250ms cubic-bezier(0.25, 0.1, 0.25, 1),
    visibility 250ms cubic-bezier(0.25, 0.1, 0.25, 1),
    transform 250ms cubic-bezier(0, 0, 0.3, 1);
  z-index: var(--z-dropdown, 100);
  pointer-events: none;
}

/* Open state - triggered by hover on desktop, click on both */
.iso-nav__item:hover .mega-menu,
.iso-nav__item--open .mega-menu,
.mega-menu--open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

.mega-menu__inner {
  max-width: var(--max-width, 1140px);
  margin: 0 auto;
  padding: 40px;
}

/* Backdrop overlay when mega menu is open */
.mega-menu-backdrop {
  position: fixed;
  inset: 0;
  top: var(--header-height, 80px);
  background-color: rgba(0, 0, 0, 0.2);
  z-index: calc(var(--z-dropdown, 100) - 1);
  opacity: 0;
  visibility: hidden;
  transition: opacity 250ms ease, visibility 250ms ease;
}

.mega-menu-backdrop--visible {
  opacity: 1;
  visibility: visible;
}

/* ------------------------------------------------------------
   2. HOME AUDIO MEGA MENU
   ------------------------------------------------------------ */

.mega-menu--home-audio .mega-menu__inner {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 48px;
}

/* Section headings */
.mega-menu__section-title {
  font-family: var(--font-primary, 'Montserrat', sans-serif);
  font-size: 14px;
  font-weight: 700;
  color: var(--iso-green, #12b051);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--iso-border, #e0e0e0);
}

/* Products grid (left column) */
.mega-menu__products-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.mega-menu__product-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px;
  border-radius: 8px;
  transition: background-color 150ms ease;
  text-decoration: none;
  color: var(--iso-dark, #333633);
  border-bottom: 2px solid transparent;
}

.mega-menu__product-item:hover {
  background-color: var(--iso-light-gray, #f5f5f5);
  border-bottom-color: var(--iso-green, #12b051);
}

.mega-menu__product-thumb {
  flex-shrink: 0;
  width: 80px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mega-menu__product-thumb img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.mega-menu__product-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.mega-menu__product-name {
  font-family: var(--font-primary, 'Montserrat', sans-serif);
  font-size: 16px;
  font-weight: 400;
  color: var(--iso-dark, #333633);
  line-height: 1.3;
}

.mega-menu__product-item:hover .mega-menu__product-name {
  color: var(--iso-green, #12b051);
}

/* Product link within div wrapper (for items with sub-links) */
.mega-menu__product-link {
  text-decoration: none;
  color: inherit;
}

a.mega-menu__product-thumb {
  text-decoration: none;
}

/* Sub-products (e.g., GAIA I, GAIA II, GAIA III) */
.mega-menu__sub-products {
  display: flex;
  gap: 12px;
  margin-top: 2px;
}

.mega-menu__sub-link {
  font-size: 12px;
  font-weight: 400;
  color: var(--iso-text, #555555);
  transition: color 150ms ease;
}

.mega-menu__sub-link:hover {
  color: var(--iso-green, #12b051);
}

/* Green divider under each product item */
.mega-menu__product-item::after {
  content: none;
}

.mega-menu__item-divider {
  grid-column: 1 / -1;
  height: 0;
}

/* Accessories column (right column) */
.mega-menu__accessories {
  border-left: 1px solid var(--iso-border, #e0e0e0);
  padding-left: 32px;
}

.mega-menu__accessory-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.mega-menu__accessory-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 8px;
  border-radius: 6px;
  transition: background-color 150ms ease;
  text-decoration: none;
  color: var(--iso-dark, #333633);
  border-bottom: 1px solid var(--iso-border, #e0e0e0);
}

.mega-menu__accessory-item:last-child {
  border-bottom: none;
}

.mega-menu__accessory-item:hover {
  background-color: var(--iso-light-gray, #f5f5f5);
}

.mega-menu__accessory-thumb {
  flex-shrink: 0;
  width: 48px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mega-menu__accessory-thumb img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.mega-menu__accessory-name {
  font-size: 14px;
  font-weight: 400;
  color: var(--iso-dark, #333633);
  line-height: 1.4;
}

.mega-menu__accessory-item:hover .mega-menu__accessory-name {
  color: var(--iso-green, #12b051);
}

/* Green underline on hover for accessory items */
.mega-menu__accessory-item::after {
  content: '';
  display: block;
}

/* ------------------------------------------------------------
   3. ABOUT DROPDOWN MENU
   ------------------------------------------------------------ */

.mega-menu--about .mega-menu__inner {
  display: block;
  max-width: 320px;
  padding: 16px 24px;
}

/* About Us links section */
.mega-menu__about-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.mega-menu__about-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 500;
  color: var(--iso-dark, #333633);
  transition: background-color 150ms ease, color 150ms ease;
  text-decoration: none;
}

.mega-menu__about-link:hover {
  background-color: var(--iso-light-gray, #f5f5f5);
  color: var(--iso-green, #12b051);
}

.mega-menu__about-link svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--iso-green, #12b051);
}

/* ------------------------------------------------------------
   4. MOBILE MEGA MENU (Accordion)
   ------------------------------------------------------------ */

@media (max-width: 1023px) {
  .mega-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border-top: none;
    pointer-events: auto;
    max-height: 0;
    overflow: hidden;
    transition: max-height 400ms cubic-bezier(0, 0, 0.3, 1);
  }

  .iso-nav__item--open .mega-menu,
  .mega-menu--open {
    max-height: 2000px;
  }

  .mega-menu__inner {
    padding: 16px 0;
  }

  /* Home Audio - stack columns */
  .mega-menu--home-audio .mega-menu__inner {
    display: flex;
    flex-direction: column;
    gap: 24px;
  }

  .mega-menu__products-grid {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .mega-menu__product-item {
    padding: 10px 16px;
    border-radius: 0;
    border-bottom: 1px solid var(--iso-border, #e0e0e0);
  }

  .mega-menu__product-thumb {
    width: 60px;
    height: 45px;
  }

  .mega-menu__product-name {
    font-size: 15px;
  }

  /* Accessories - remove border */
  .mega-menu__accessories {
    border-left: none;
    padding-left: 0;
    border-top: 1px solid var(--iso-border, #e0e0e0);
    padding-top: 16px;
  }

  .mega-menu__accessory-item {
    padding: 8px 16px;
  }

  /* About menu */
  .mega-menu--about .mega-menu__inner {
    display: block;
    max-width: none;
    padding: 16px 0;
  }

  .mega-menu__about-link {
    padding: 10px 16px;
    border-radius: 0;
    border-bottom: 1px solid var(--iso-border, #e0e0e0);
  }

  /* Hide backdrop on mobile */
  .mega-menu-backdrop {
    display: none;
  }
}

/* Mobile nav accordion styles (used in .iso-mobile-nav) */
.iso-mobile-submenu {
  max-height: 0;
  overflow: hidden;
  transition: max-height 400ms cubic-bezier(0, 0, 0.3, 1);
  background-color: var(--iso-light-gray, #f5f5f5);
}

.iso-mobile-nav__item--open .iso-mobile-submenu {
  max-height: 1500px;
}

.iso-mobile-submenu__section {
  padding: 16px 24px;
}

.iso-mobile-submenu__title {
  font-size: 12px;
  font-weight: 700;
  color: var(--iso-green, #12b051);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 12px;
}

.iso-mobile-submenu__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.iso-mobile-submenu__link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  font-size: 15px;
  font-weight: 400;
  color: var(--iso-dark, #333633);
  border-bottom: 1px solid var(--iso-border, #e0e0e0);
  transition: color 150ms ease;
}

.iso-mobile-submenu__link:last-child {
  border-bottom: none;
}

.iso-mobile-submenu__link:hover {
  color: var(--iso-green, #12b051);
}

.iso-mobile-submenu__link img {
  width: 40px;
  height: 30px;
  object-fit: contain;
  flex-shrink: 0;
}

/* ------------------------------------------------------------
   5. ANIMATIONS
   ------------------------------------------------------------ */

/* Staggered fade-in for menu items */
.mega-menu.mega-menu--open .mega-menu__product-item,
.iso-nav__item:hover .mega-menu .mega-menu__product-item {
  animation: menuItemFadeIn 300ms ease forwards;
}

.mega-menu.mega-menu--open .mega-menu__accessory-item,
.iso-nav__item:hover .mega-menu .mega-menu__accessory-item {
  animation: menuItemFadeIn 300ms ease forwards;
}

@keyframes menuItemFadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Stagger delays */
.mega-menu__product-item:nth-child(1) { animation-delay: 0ms; }
.mega-menu__product-item:nth-child(2) { animation-delay: 30ms; }
.mega-menu__product-item:nth-child(3) { animation-delay: 60ms; }
.mega-menu__product-item:nth-child(4) { animation-delay: 90ms; }
.mega-menu__product-item:nth-child(5) { animation-delay: 120ms; }
.mega-menu__product-item:nth-child(6) { animation-delay: 150ms; }
.mega-menu__product-item:nth-child(7) { animation-delay: 180ms; }
.mega-menu__product-item:nth-child(8) { animation-delay: 210ms; }

.mega-menu__accessory-item:nth-child(1) { animation-delay: 50ms; }
.mega-menu__accessory-item:nth-child(2) { animation-delay: 80ms; }
.mega-menu__accessory-item:nth-child(3) { animation-delay: 110ms; }
.mega-menu__accessory-item:nth-child(4) { animation-delay: 140ms; }
.mega-menu__accessory-item:nth-child(5) { animation-delay: 170ms; }
.mega-menu__accessory-item:nth-child(6) { animation-delay: 200ms; }
.mega-menu__accessory-item:nth-child(7) { animation-delay: 230ms; }
.mega-menu__accessory-item:nth-child(8) { animation-delay: 260ms; }

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .mega-menu {
    transition: opacity 0ms, visibility 0ms;
  }

  .mega-menu__product-item,
  .mega-menu__accessory-item {
    animation: none !important;
  }

  .iso-mobile-submenu {
    transition: none;
  }
}

/* ------------------------------------------------------------
   6. HOVER DELAY (prevent accidental close)
   ------------------------------------------------------------ */

/* Add a small invisible area to prevent menu from closing
   when moving mouse between nav item and mega menu */
.iso-nav__item::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 0;
  right: 0;
  height: 10px;
  display: none;
}

.iso-nav__item:hover::after {
  display: block;
}