/* ============================================
   Navigation — Header + Footer
   ============================================ */

/* ── Main Nav Links ── */

.site-header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

/* ── Dropdown Menu ── */

.nav-dropdown {
  position: relative;
}

.nav-dropdown__trigger {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  transition: color var(--duration-fast) var(--ease-out),
              background-color var(--duration-fast) var(--ease-out);
  background: none;
  border: none;
  cursor: pointer;
  font: inherit;
}

.nav-dropdown__trigger:hover {
  color: var(--color-text-primary);
  background: var(--color-surface-2);
}

.nav-dropdown__trigger:focus {
  outline: 2px solid var(--color-brand-500);
  outline-offset: 2px;
}

.nav-dropdown__trigger[aria-expanded="true"] {
  color: var(--color-text-primary);
  background: var(--color-surface-2);
}

@media (prefers-color-scheme: dark) {
  .nav-dropdown__trigger[aria-expanded="true"] {
    color: var(--color-text-primary);
  }
}

.nav-dropdown__chevron {
  width: 10px;
  height: 10px;
  transition: transform var(--duration-base) var(--ease-out);
}

.nav-dropdown__trigger[aria-expanded="true"] .nav-dropdown__chevron {
  transform: rotate(180deg);
}

.nav-dropdown__menu {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  background: var(--color-surface-0);
  border: 1px solid var(--color-border-200);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  min-width: 220px;
  padding: var(--space-xs) 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity var(--duration-fast) var(--ease-out),
              transform var(--duration-fast) var(--ease-out),
              visibility var(--duration-fast) var(--ease-out);
  z-index: 200;
  max-height: 70vh;
  overflow-y: auto;
}

.nav-dropdown--open .nav-dropdown__menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-dropdown__group {
  padding: var(--space-xs) 0;
}

.nav-dropdown__group + .nav-dropdown__group {
  border-top: 1px solid var(--color-border-100);
}

.nav-dropdown__group-label {
  padding: 4px var(--space-md);
  font-size: 10px;
  font-weight: var(--font-semibold);
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--color-text-tertiary);
}

.nav-dropdown__item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  width: 100%;
  padding: var(--space-xs) var(--space-md);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  transition: background-color var(--duration-fast) var(--ease-out),
              color var(--duration-fast) var(--ease-out);
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  text-decoration: none;
}

.nav-dropdown__item:hover {
  background: var(--color-surface-2);
  color: var(--color-text-primary);
}

.nav-dropdown__item:focus {
  outline: 2px solid var(--color-brand-500);
  outline-offset: -2px;
}

.nav-dropdown__item--active {
  background: var(--color-brand-50);
  color: var(--color-brand-600);
  font-weight: var(--font-medium);
}

@media (prefers-color-scheme: dark) {
  .nav-dropdown__item--active {
    background: color-mix(in srgb, var(--color-brand-500) 15%, transparent);
    color: var(--color-brand-300);
  }
}

.nav-dropdown__item-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* ── Demo Category Nav Tabs ── */

.nav-tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--color-border-100);
  padding: 0 var(--space-lg);
  overflow-x: auto;
  scrollbar-width: none;
}

.nav-tabs::-webkit-scrollbar {
  display: none;
}

.nav-tabs__item {
  padding: var(--space-sm) var(--space-md);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-tertiary);
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  white-space: nowrap;
  transition: color var(--duration-fast) var(--ease-out),
              border-color var(--duration-fast) var(--ease-out);
  background: none;
  border-top: none;
  border-left: none;
  border-right: none;
  cursor: pointer;
}

.nav-tabs__item:hover {
  color: var(--color-text-secondary);
}

.nav-tabs__item:focus {
  outline: 2px solid var(--color-brand-500);
  outline-offset: -2px;
}

.nav-tabs__item--active {
  color: var(--color-brand-600);
  border-bottom-color: var(--color-brand-500);
  font-weight: var(--font-semibold);
}

@media (prefers-color-scheme: dark) {
  .nav-tabs__item--active {
    color: var(--color-brand-300);
    border-bottom-color: var(--color-brand-400);
  }
}

/* ── Mobile Nav Dropdown ── */

@media (max-width: 768px) {
  .nav-dropdown__menu {
    position: static;
    box-shadow: none;
    border: none;
    background: var(--color-surface-1);
    max-height: none;
    opacity: 1;
    visibility: visible;
    transform: none;
    display: none;
    margin-top: var(--space-xs);
    border-radius: var(--radius-sm);
  }

  .nav-dropdown--open .nav-dropdown__menu {
    display: block;
  }

  .nav-dropdown__item {
    padding: var(--space-sm) var(--space-lg);
  }
  
  .site-header__inner {
    flex-wrap: wrap;
  }
  
  .site-header__nav {
    display: none;
    width: 100%;
    justify-content: space-between;
    margin-top: var(--space-sm);
  }

  .site-header__nav.nav--open {
    display: flex;
  }
}

/* ── Breadcrumb ── */

.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-lg);
  padding-left: var(--space-lg);
}

.breadcrumb__link {
  color: var(--color-text-tertiary);
  transition: color var(--duration-fast) var(--ease-out);
}

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

.breadcrumb__separator {
  width: 12px;
  height: 12px;
  opacity: 0.4;
}

.breadcrumb__current {
  color: var(--color-text-secondary);
  font-weight: var(--font-medium);
}