/* ==========================================================================
   MEGA MENU — CSS
   Architecture : BEM naming · CSS Grid · Mobile-first responsive
   Naming       : mega-menu__ (dropdown), site-nav__ (top bar)
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties
   -------------------------------------------------------------------------- */
:root {
  /* Nav bar */
  --mm-nav-bg:           #1c1c1c;
  --mm-nav-text:         #ffffff;
  --mm-nav-hover-bg:     rgba(255, 255, 255, 0.10);
  --mm-nav-active-bg:    rgba(255, 255, 255, 0.16);
  --mm-nav-height:       46px;
  --mm-nav-font-size:    0.8125rem;   /* 13 px */

  /* Dropdown panel */
  --mm-panel-bg:         #ffffff;
  --mm-panel-shadow:     0 6px 28px rgba(0, 0, 0, 0.14);
  --mm-panel-border:     1px solid rgba(0, 0, 0, 0.08);
  --mm-panel-radius:     0 0 4px 4px;
  --mm-panel-width:      900px;

  /* Products column */
  --mm-products-bg:      #f4f4f4;
  --mm-products-border:  1px solid rgba(0, 0, 0, 0.07);

  /* Content */
  --mm-col-gap:          1.5rem;      /* gap between content columns */
  --mm-section-gap:      1.125rem;    /* gap between sections in a column */

  /* Typography */
  --mm-section-title-size:  0.8125rem; /* 13 px */
  --mm-link-size:           0.8125rem; /* 13 px */
  --mm-product-title-size:  0.6875rem; /* 11 px */
  --mm-cta-size:            0.75rem;   /* 12 px */

  /* Colours */
  --mm-section-title-color: #1a1a1a;
  --mm-link-color:          #444444;
  --mm-link-hover-color:    #0060b9;
  --mm-link-hover-bg:       rgba(0, 96, 185, 0.05);
  --mm-cta-color:           #1a1a1a;
  --mm-cta-border:          #1a1a1a;
  --mm-cta-hover-bg:        #1a1a1a;
  --mm-cta-hover-color:     #ffffff;

  /* Layout ratios (set on .mega-menu, inherited by children) */
  --mm-content-cols:     3;
  --mm-product-cols:     2;

  /* Transition */
  --mm-transition:       0.18s ease;
}

/* --------------------------------------------------------------------------
   Reset / Base
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

/* --------------------------------------------------------------------------
   Accessibility Utilities
   -------------------------------------------------------------------------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  z-index: 9999;
  padding: 0.75rem 1.25rem;
  background: #000;
  color: #fff;
  font-size: 0.875rem;
  font-weight: 700;
  text-decoration: none;
}

.skip-link:focus {
  top: 0;
}

/* --------------------------------------------------------------------------
   Site Navigation — Top Bar
   -------------------------------------------------------------------------- */
.site-nav {
  background-color: var(--mm-nav-bg);
  position: relative;
  z-index: 500;
}

.site-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: stretch;
}

.site-nav__item {
  position: static;   /* mega menu positions relative to nav, not li */
}

/* Shared styles for all trigger types */
.site-nav__link,
.site-nav__trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0 1.125rem;
  height: var(--mm-nav-height);
  color: var(--mm-nav-text);
  text-decoration: none;
  font-size: var(--mm-nav-font-size);
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  font-family: inherit;
  white-space: nowrap;
  transition: background-color var(--mm-transition), border-color var(--mm-transition);
  line-height: 1;
}

.site-nav__link:hover,
.site-nav__trigger:hover {
  background-color: var(--mm-nav-hover-bg);
}

.site-nav__trigger[aria-expanded="true"] {
  background-color: var(--mm-nav-active-bg);
  border-bottom-color: #ffffff;
}

.site-nav__link:focus-visible,
.site-nav__trigger:focus-visible {
  outline: 2px solid #ffffff;
  outline-offset: -3px;
}

/* Chevron arrow */
.site-nav__arrow {
  flex-shrink: 0;
  transition: transform var(--mm-transition);
}

.site-nav__trigger[aria-expanded="true"] .site-nav__arrow {
  transform: rotate(180deg);
}

/* Placeholder nav item bars (visual slots for extra items) */
.site-nav__link--placeholder {
  cursor: default;
  pointer-events: none;
}

.site-nav__placeholder-bar {
  display: block;
  width: 52px;
  height: 10px;
  background: rgba(255, 255, 255, 0.18);
  border-radius: 3px;
}

/* Mobile hamburger — hidden on desktop */
.site-nav__mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: var(--mm-nav-height);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  margin-left: auto;
}

.site-nav__bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--mm-nav-text);
  border-radius: 2px;
  transition: transform var(--mm-transition), opacity var(--mm-transition);
}

.site-nav__mobile-toggle[aria-expanded="true"] .site-nav__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.site-nav__mobile-toggle[aria-expanded="true"] .site-nav__bar:nth-child(2) {
  opacity: 0;
}

.site-nav__mobile-toggle[aria-expanded="true"] .site-nav__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --------------------------------------------------------------------------
   Mega Menu — Panel
   -------------------------------------------------------------------------- */
.mega-menu {
  position: absolute;
  top: 100%;
  left: 0;
  width: var(--mm-panel-width);
  background: var(--mm-panel-bg);
  border: var(--mm-panel-border);
  border-top: none;
  box-shadow: var(--mm-panel-shadow);
  border-radius: var(--mm-panel-radius);
  z-index: 400;

  /* Closed state */
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  pointer-events: none;
  transition:
    opacity var(--mm-transition),
    visibility var(--mm-transition),
    transform var(--mm-transition);
}

.mega-menu.is-open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

/* Column-count modifiers — set CSS variable on panel, used by grid children */
.mega-menu--2-columns { --mm-content-cols: 2; }
.mega-menu--3-columns { --mm-content-cols: 3; }
.mega-menu--4-columns { --mm-content-cols: 4; }

/* Wider panel for 4-column layouts */
.mega-menu--4-columns {
  width: min(960px, 90vw);
}

/* --------------------------------------------------------------------------
   Mega Menu — Inner grid (20 / 80 split)
   -------------------------------------------------------------------------- */
.mega-menu__inner {
  display: grid;
  grid-template-columns: 25% 75%;
  align-items: start;
  min-height: 0;
}

/* When left product panel is absent */
.mega-menu--no-products .mega-menu__inner {
  grid-template-columns: 1fr;
}

/* --------------------------------------------------------------------------
   Left Column — Product Cards (Shoppable Buttons)
   -------------------------------------------------------------------------- */
.mega-menu__products {
  background-color: var(--mm-products-bg);
  border-right: var(--mm-products-border);
  padding: 1.125rem 0.875rem;
  align-self: stretch;
}

/* Grid column modifiers */
.mega-menu__products--1-column { --mm-product-cols: 1; }
.mega-menu__products--2-columns { --mm-product-cols: 2; }

.mega-menu__products-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(var(--mm-product-cols, 2), minmax(0, 1fr));
  gap: 0.5rem;
}

.mega-menu__product-card {
  display: flex;   /* equal-height cards in the grid row */
}

.mega-menu__product-link {
  display: flex;
  flex-direction: column;
  width: 100%;
  text-decoration: none;
  background: #b7b5b5c9;
  border: 1px solid rgba(0, 0, 0, 0.07);
  padding: 0.5rem 0.375rem 0.5rem;
  border-radius: 10px;
  transition:
    border-color var(--mm-transition),
    box-shadow var(--mm-transition);
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.mega-menu__product-link:hover {
  border-color: rgba(0, 0, 0, 0.18);
}

.mega-menu__product-link:focus-visible {
  outline: 2px solid var(--mm-link-hover-color);
  outline-offset: 1px;
}

.mega-menu__product-figure {
  margin: 0;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.375rem;
  flex: 1;
}

.mega-menu__product-image {
  display: block;
  width: 100%;
  max-width: 90px;
  height: 72px;
  object-fit: contain;
  background-color: #ebebeb;   /* placeholder when image fails to load */
}

.mega-menu__product-title {
  display: block;
  font-size: var(--mm-product-title-size);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--mm-section-title-color);
  line-height: 1.35;
  text-align: center;
}

/* --------------------------------------------------------------------------
   Right Column — Content Area
   -------------------------------------------------------------------------- */
.mega-menu__content {
  padding: 1.25rem 1.375rem 1.25rem 1.25rem;
  display: flex;
  flex-direction: column;
}

.mega-menu__content-grid {
  display: grid;
  grid-template-columns: repeat(var(--mm-content-cols, 3), minmax(0, 1fr));
  gap: var(--mm-col-gap);
  align-items: start;
}

.mega-menu__column {
  display: flex;
  flex-direction: column;
  gap: var(--mm-section-gap);
  height: 100%;
}

/* --------------------------------------------------------------------------
   Section Title
   -------------------------------------------------------------------------- */
.mega-menu__section {
  flex: 1 0 auto;
}

.mega-menu__section-title {
  margin: 0 0 0.5rem;
  padding-bottom: 0.375rem;
  font-size: var(--mm-section-title-size);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--mm-section-title-color);
  border-bottom: 1.5px solid var(--mm-section-title-color);
  line-height: 1.4;
}

/* --------------------------------------------------------------------------
   Sub Links
   -------------------------------------------------------------------------- */
.mega-menu__link-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.mega-menu__link-item {
  display: flex;
}

.mega-menu__link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.3rem 0.375rem;
  width: 100%;
  text-decoration: none;
  color: var(--mm-link-color);
  font-size: var(--mm-link-size);
  line-height: 1.4;
  border-radius: 3px;
  transition: color var(--mm-transition), background-color var(--mm-transition);
}

.mega-menu__link:hover {
  color: var(--mm-link-hover-color);
  background-color: var(--mm-link-hover-bg);
}

.mega-menu__link:focus-visible {
  outline: 2px solid var(--mm-link-hover-color);
  outline-offset: 1px;
  color: var(--mm-link-hover-color);
}

.mega-menu__link-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: block;
}

.mega-menu__link-text {
  flex: 1;
  min-width: 0;
}

/* --------------------------------------------------------------------------
   CTA — Button and Text variants
   -------------------------------------------------------------------------- */
.mega-menu__cta {
  margin-top: auto;
  padding-top: 0.75rem;
}

/* Default: outlined button */
.mega-menu__cta-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.45rem 0.875rem;
  text-decoration: none;
  font-size: var(--mm-cta-size);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--mm-cta-color);
  border: 1.5px solid var(--mm-cta-border);
  background: transparent;
  border-radius: 2px;
  transition:
    background-color var(--mm-transition),
    color var(--mm-transition);
  white-space: nowrap;
}

.mega-menu__cta-link:hover {
  background-color: var(--mm-cta-hover-bg);
  color: var(--mm-cta-hover-color);
}

.mega-menu__cta-link:focus-visible {
  outline: 2px solid var(--mm-link-hover-color);
  outline-offset: 2px;
}

/* Modifier: text-link style (e.g. "All business solutions >") */
.mega-menu__cta-link--text {
  border: none;
  padding: 0;
  font-size: var(--mm-link-size);
  font-weight: 400;
  letter-spacing: 0;
  text-transform: none;
  color: var(--mm-link-color);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.mega-menu__cta-link--text:hover {
  background-color: transparent;
  color: var(--mm-link-hover-color);
}

.mega-menu__cta-arrow {
  flex-shrink: 0;
  display: block;
}

/* --------------------------------------------------------------------------
   Demo Page — not part of mega menu module
   -------------------------------------------------------------------------- */
.demo-main {
  padding: 3rem 2rem;
  max-width: 900px;
  margin: 0 auto;
}

.demo-content__title {
  font-size: 1.5rem;
  color: #1a1a1a;
  margin: 0 0 0.75rem;
}

.demo-content__description {
  font-size: 0.9375rem;
  color: #555;
  line-height: 1.6;
  margin: 0 0 2rem;
}

.demo-content__description kbd {
  display: inline-block;
  padding: 0.1em 0.4em;
  font-size: 0.875em;
  font-family: inherit;
  background: #f0f0f0;
  border: 1px solid #ccc;
  border-radius: 3px;
}

.demo-variants__title {
  font-size: 1rem;
  color: #1a1a1a;
  margin: 0 0 0.75rem;
}

.demo-variants__list {
  padding-left: 1.25rem;
  color: #555;
  font-size: 0.9rem;
  line-height: 1.75;
}

/* --------------------------------------------------------------------------
   Responsive — Tablet  (≤ 1024 px)
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {

  .mega-menu,
  .mega-menu--4-columns {
    width: 100%;
    left: 0;
    right: 0;
  }

  /* Reduce to 2 content columns on tablet */
  .mega-menu--3-columns,
  .mega-menu--4-columns {
    --mm-content-cols: 2;
  }

  /* Hide left product sidebar on tablet */
  .mega-menu__products {
    display: none;
  }

  .mega-menu__inner {
    grid-template-columns: 1fr;
  }
}

/* --------------------------------------------------------------------------
   Responsive — Mobile  (≤ 768 px)
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {

  /* Show hamburger, hide desktop list */
  .site-nav__mobile-toggle {
    display: flex;
  }

  .site-nav__list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
  }

  .site-nav__list.is-open {
    display: flex;
  }

  .site-nav__link,
  .site-nav__trigger {
    height: auto;
    padding: 0.875rem 1.25rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.07);
    justify-content: space-between;
    width: 100%;
    text-align: left;
  }

  .site-nav__link--placeholder {
    display: none;
  }

  /* Mega menu becomes static accordion on mobile */
  .mega-menu {
    position: static;
    width: 100%;
    box-shadow: none;
    border: none;
    border-radius: 0;
    border-top: 1px solid rgba(0, 0, 0, 0.08);
    opacity: 1;
    visibility: visible;
    transform: none;
    pointer-events: auto;
    display: none;
    transition: none;
  }

  .mega-menu.is-open {
    display: block;
  }

  .mega-menu__inner {
    grid-template-columns: 1fr;
  }

  /* Single column for all content on mobile */
  .mega-menu--2-columns,
  .mega-menu--3-columns,
  .mega-menu--4-columns {
    --mm-content-cols: 1;
  }

  .mega-menu__content {
    padding: 1rem;
  }

  /* Product cards reflow to 2-column on mobile */
  .mega-menu__products {
    display: block;
    border-right: none;
    border-bottom: 1px solid rgba(0, 0, 0, 0.07);
  }

  .mega-menu__products-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .mega-menu__column {
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    padding-bottom: 1rem;
    margin-bottom: 0.5rem;
  }

  .mega-menu__column:last-child {
    border-bottom: none;
    margin-bottom: 0;
  }
}

/* --------------------------------------------------------------------------
   Responsive — Small mobile  (≤ 480 px)
   -------------------------------------------------------------------------- */
@media (max-width: 480px) {

  .mega-menu__products-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .mega-menu__product-image {
    height: 56px;
  }
}

/* --------------------------------------------------------------------------
   Reduced motion
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  .mega-menu,
  .site-nav__link,
  .site-nav__trigger,
  .site-nav__arrow,
  .site-nav__bar,
  .mega-menu__product-link,
  .mega-menu__link,
  .mega-menu__cta-link {
    transition: none;
  }
}

/* --------------------------------------------------------------------------
   High contrast mode support
   -------------------------------------------------------------------------- */
@media (forced-colors: active) {
  .mega-menu {
    border: 1px solid ButtonText;
  }

  .mega-menu__cta-link {
    border: 1px solid ButtonText;
  }

  .mega-menu__link:focus-visible,
  .mega-menu__cta-link:focus-visible,
  .site-nav__trigger:focus-visible {
    outline: 3px solid Highlight;
  }
}