/* =============================================
   NAVIGATION — Apple-style mega dropdown
   ============================================= */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(18, 20, 30, 0.92);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border-subtle);
}

.site-nav {
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: var(--space-6);
  height: 52px;
}

.site-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.site-logo img {
  height: 24px;
  width: auto;
}

/* ---- Primary nav links (Build, Catalogue) — left-aligned after logo ---- */
.nav-center {
  display: none;
  align-items: center;
  gap: var(--space-1);
}

.nav-link {
  position: relative;
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--text-secondary);
  background: none;
  border: none;
  cursor: pointer;
  letter-spacing: 0.01em;
  transition: color var(--duration-normal) var(--ease-out);
}

.nav-link:hover {
  color: var(--text-primary);
}

.nav-link--active,
.nav-link--catalogue[data-active="true"] {
  color: var(--text-primary);
}

.nav-chevron {
  display: inline-block;
  vertical-align: middle;
  margin-left: 3px;
  opacity: 0.5;
  transition: transform var(--duration-normal) var(--ease-out),
              opacity var(--duration-normal) var(--ease-out);
}

.mega-open .nav-chevron {
  transform: rotate(180deg);
  opacity: 0.8;
}

/* ---- Right side ---- */
.nav-end {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-left: auto;
}

.nav-cta {
  display: none;
  align-items: center;
  font-size: 12px;
  font-weight: var(--weight-semibold);
  letter-spacing: 0.02em;
  color: var(--text-inverse);
  background: var(--accent);
  padding: 7px var(--space-4);
  border-radius: var(--radius-full);
  transition: background var(--duration-normal) var(--ease-out);
}

.nav-cta:hover {
  background: var(--accent-hover);
}

.nav-mobile-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: color var(--duration-normal) var(--ease-out);
}

.nav-mobile-toggle:hover {
  color: var(--text-primary);
}

/* =============================================
   MEGA DROPDOWN — full-width panel
   ============================================= */

.mega-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  z-index: 99;
  background: var(--bg-base);
  border-bottom: 1px solid var(--border-subtle);
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  overflow: hidden;
}

.mega-dropdown.is-active {
  grid-template-rows: 1fr;
}

.mega-dropdown-inner {
  min-height: 0;
  overflow: hidden;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.mega-dropdown-inner-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr auto;
  gap: var(--space-10);
  padding-top: var(--space-8);
  padding-bottom: var(--space-10);
}

.mega-label {
  display: block;
  font-size: 11px;
  font-weight: var(--weight-semibold);
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-5);
}

.mega-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.mega-link {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  transition: background var(--duration-fast) var(--ease-out);
}

.mega-link:hover {
  background: var(--bg-elevated);
}

.mega-link-img {
  width: 40px;
  height: 40px;
  object-fit: contain;
  flex-shrink: 0;
  border-radius: var(--radius-md);
  opacity: 0.75;
  transition: opacity var(--duration-normal) var(--ease-out);
}

.mega-link:hover .mega-link-img {
  opacity: 1;
}

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

.mega-link-name {
  display: block;
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  color: var(--text-primary);
  margin-bottom: 2px;
  letter-spacing: -0.01em;
}

.mega-link-desc {
  display: block;
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  line-height: 1.4;
}

.mega-link:hover .mega-link-name {
  color: var(--accent-text);
}

.mega-col--action {
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  padding-bottom: var(--space-2);
}

.mega-browse {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--accent-text);
  transition: color var(--duration-normal) var(--ease-out),
              gap var(--duration-normal) var(--ease-out);
}

.mega-browse:hover {
  color: var(--accent-hover);
  gap: var(--space-3);
}

/* Backdrop — blurs page content behind the dropdown */
.mega-backdrop {
  position: fixed;
  inset: 0;
  z-index: 99;
  background: rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s var(--ease-out);
}

.mega-backdrop.is-active {
  opacity: 1;
  pointer-events: auto;
}

/* =============================================
   MOBILE DRAWER
   ============================================= */

.nav-mobile-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: var(--bg-overlay);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-slow) var(--ease-out);
}

.nav-mobile-overlay.is-active {
  opacity: 1;
  pointer-events: auto;
}

.nav-mobile-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 201;
  width: min(340px, 88vw);
  background: rgba(18, 20, 30, 0.97);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-left: 1px solid var(--border-subtle);
  transform: translateX(100%);
  transition: transform var(--duration-slow) var(--ease-out);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.nav-mobile-drawer.is-active {
  transform: translateX(0);
}

.nav-mobile-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5);
  border-bottom: 1px solid var(--border-subtle);
}

.nav-mobile-title {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.nav-mobile-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
}

.nav-mobile-close:hover {
  color: var(--text-primary);
}

.nav-mobile-links {
  padding: var(--space-4) var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.nav-mobile-link {
  display: flex;
  align-items: center;
  padding: var(--space-3) var(--space-3);
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  min-height: 44px;
  transition: color var(--duration-normal) var(--ease-out),
              background-color var(--duration-normal) var(--ease-out);
}

.nav-mobile-link:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.04);
}

.nav-mobile-categories {
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.nav-mobile-label {
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: var(--space-2) var(--space-3);
}

/* =============================================
   RESPONSIVE
   ============================================= */

@media (min-width: 640px) {
  .nav-center {
    display: flex;
  }
  .nav-cta {
    display: inline-flex;
  }
  .nav-mobile-toggle {
    display: none;
  }
}