/**
 * Qahera UI Kit — Megamenu Component (Native CSS)
 * 
 * Expansive multi-column navigation surface hosting categorized links,
 * featured media cards, and promotional callouts.
 * 
 * @spec 01-CORE-SPEC §3.2
 * @version 1.0.0
 */

/* ==========================================================================
   1. Megamenu Container & Surface
   ========================================================================== */

.qhr-megamenu-wrapper {
  position: relative;
  display: inline-block;
}

.qhr-megamenu {
  --_mega-bg: var(--qhr-surface-elevated, #111a27);
  --_mega-fg: var(--qhr-content-primary, #f8fafc);
  --_mega-fg-muted: var(--qhr-content-secondary, #94a3b8);
  --_mega-border: var(--qhr-border-subtle, rgba(255, 255, 255, 0.08));
  --_mega-hover-bg: color-mix(in srgb, var(--_mega-fg) 6%, transparent);
  --_mega-brand: var(--qhr-color-primary-500, #c7a35a);

  display: none;
  position: absolute;
  inset-block-start: calc(100% + var(--qhr-space-2, 8px));
  inset-inline-start: 0;
  inline-size: min(92vw, 880px);
  max-inline-size: calc(100vw - 32px);
  background-color: var(--_mega-bg);
  border: 1px solid var(--_mega-border);
  border-radius: var(--qhr-radius-lg, 12px);
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.35);
  padding: var(--qhr-space-6, 24px);
  z-index: 100;
  box-sizing: border-box;
  font-family: var(--qhr-font-family-primary, 'Cairo', sans-serif);
  animation: qhrMegaFadeIn 180ms cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* Horizontal Alignment Modifiers */
.qhr-megamenu--start {
  inset-inline-start: 0;
  inset-inline-end: auto;
}

.qhr-megamenu--end {
  inset-inline-start: auto;
  inset-inline-end: 0;
}

.qhr-megamenu--center {
  inset-inline-start: 50%;
  transform: translateX(-50%);
}
[dir="rtl"] .qhr-megamenu--center {
  transform: translateX(50%);
}

/* Contained / Full-nav Megamenu */
.qhr-megamenu--container {
  inset-inline: 0;
  margin-inline: auto;
  inline-size: 100%;
  max-inline-size: 1100px;
}

.qhr-megamenu.is-open,
.qhr-megamenu-wrapper:hover .qhr-megamenu,
.qhr-megamenu-wrapper:focus-within .qhr-megamenu {
  display: block;
}

@keyframes qhrMegaFadeIn {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==========================================================================
   2. Grid Layouts
   ========================================================================== */

.qhr-megamenu-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--qhr-space-6, 24px);
}

.qhr-megamenu--2-cols .qhr-megamenu-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.qhr-megamenu--3-cols .qhr-megamenu-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.qhr-megamenu--4-cols .qhr-megamenu-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.qhr-megamenu--with-featured .qhr-megamenu-grid {
  grid-template-columns: 2.4fr 1fr;
}

.qhr-megamenu--full-width {
  position: fixed;
  inset-inline: 0;
  inline-size: 100vw;
  border-radius: 0;
  border-inline: none;
}

.qhr-megamenu--glass {
  background-color: color-mix(in srgb, var(--_mega-bg) 85%, transparent);
  backdrop-filter: blur(20px);
}

/* ==========================================================================
   3. Columns, Headings & Links
   ========================================================================== */

.qhr-megamenu-col {
  display: flex;
  flex-direction: column;
  gap: var(--qhr-space-3, 12px);
}

.qhr-megamenu-col-header {
  display: flex;
  align-items: center;
  gap: var(--qhr-space-2, 8px);
  padding-block-end: var(--qhr-space-2, 8px);
  border-block-end: 1px solid var(--_mega-border);
}

.qhr-megamenu-col-title {
  font-size: var(--qhr-text-sm, 0.875rem);
  font-weight: 700;
  color: var(--_mega-brand);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin: 0;
}

.qhr-megamenu-list {
  display: flex;
  flex-direction: column;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: var(--qhr-space-1, 4px);
}

.qhr-megamenu-item {
  list-style: none;
  margin: 0;
  padding: 0;
}

.qhr-megamenu-link {
  display: flex;
  align-items: flex-start;
  gap: var(--qhr-space-3, 12px);
  padding: var(--qhr-space-2, 8px);
  border-radius: var(--qhr-radius-sm, 6px);
  text-decoration: none;
  color: var(--_mega-fg);
  transition: background-color var(--qhr-duration-fast, 150ms) ease;
}

.qhr-megamenu-link:hover {
  background-color: var(--_mega-hover-bg);
}

.qhr-megamenu-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  inline-size: 2rem;
  block-size: 2rem;
  border-radius: var(--qhr-radius-sm, 6px);
  background-color: color-mix(in srgb, var(--_mega-brand) 12%, transparent);
  color: var(--_mega-brand);
  flex-shrink: 0;
}

.qhr-megamenu-content {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-inline-size: 0;
}

.qhr-megamenu-label {
  font-size: var(--qhr-text-sm, 0.875rem);
  font-weight: 600;
  color: var(--_mega-fg);
}

.qhr-megamenu-desc {
  font-size: var(--qhr-text-xs, 0.75rem);
  color: var(--_mega-fg-muted);
  line-height: 1.4;
}

/* ==========================================================================
   4. Featured Promotional Card
   ========================================================================== */

.qhr-megamenu-featured {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: var(--qhr-space-4, 16px);
  border-radius: var(--qhr-radius-md, 8px);
  background: radial-gradient(circle at 100% 0%, color-mix(in srgb, var(--_mega-brand) 18%, transparent), transparent 75%),
              var(--qhr-surface-card, #162233);
  border: 1px solid var(--_mega-border);
}

.qhr-megamenu-featured-title {
  font-size: var(--qhr-text-base, 1rem);
  font-weight: 700;
  color: var(--_mega-fg);
  margin-block-end: 4px;
}

.qhr-megamenu-featured-desc {
  font-size: var(--qhr-text-xs, 0.8125rem);
  color: var(--_mega-fg-muted);
  line-height: 1.5;
  margin-block-end: var(--qhr-space-4, 16px);
}

/* ==========================================================================
   5. Footer Strip
   ========================================================================== */

.qhr-megamenu-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-block-start: var(--qhr-space-4, 16px);
  padding-block-start: var(--qhr-space-3, 12px);
  border-block-start: 1px solid var(--_mega-border);
  font-size: var(--qhr-text-xs, 0.75rem);
  color: var(--_mega-fg-muted);
}

/* ==========================================================================
   6. Responsive Adaptations
   ========================================================================== */

@media (max-width: 768px) {
  .qhr-megamenu {
    position: static;
    inline-size: 100%;
    padding: var(--qhr-space-3, 12px);
    box-shadow: none;
  }
  .qhr-megamenu-grid {
    grid-template-columns: 1fr !important;
    gap: var(--qhr-space-4, 16px);
  }
}