/* ==========================================================================
   AIPickZone Header — Premium Sticky Header
   ========================================================================== */

/* Header */
.aipz-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: 64px;
  background: transparent;
  transition: background var(--transition-normal), box-shadow var(--transition-normal), backdrop-filter var(--transition-normal);
}

.aipz-header.is-scrolled {
  background: rgba(19, 19, 42, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--aipz-border);
}

/* Offset body content for fixed header */
.aipz-site-content {
  padding-top: 64px;
}

.aipz-header__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  height: 100%;
}

/* --- Logo --- */
.aipz-header__logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  flex-shrink: 0;
  min-height: 44px;
}

.aipz-header__logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--aipz-text-primary);
  letter-spacing: -0.01em;
}

.aipz-header__logo-icon {
  display: flex;
  align-items: center;
}

/* --- Desktop Nav --- */
.aipz-header__nav {
  display: flex;
  align-items: center;
}

.aipz-header__menu {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.aipz-header__menu > li > a {
  display: flex;
  align-items: center;
  padding: 0.5rem 0.875rem;
  color: var(--aipz-text-secondary);
  text-decoration: none;
  font-size: var(--text-small);
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background var(--transition-fast);
  white-space: nowrap;
  min-height: 44px;
  position: relative;
}

.aipz-header__menu > li > a::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 0.875rem;
  right: 0.875rem;
  height: 2px;
  background: var(--aipz-accent-teal);
  border-radius: 1px;
  transform: scaleX(0);
  transition: transform var(--transition-normal);
}

.aipz-header__menu > li > a:hover {
  color: var(--aipz-text-primary);
}

.aipz-header__menu > li > a:hover::after,
.aipz-header__menu > li.current-menu-item > a::after {
  transform: scaleX(1);
}

.aipz-header__menu > li.current-menu-item > a {
  color: var(--aipz-accent-teal);
}

/* --- Dropdown Submenu --- */
.aipz-header__menu .sub-menu {
  display: none;
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  min-width: 200px;
  background: var(--aipz-surface-2);
  border: 1px solid var(--aipz-border);
  border-radius: var(--radius-lg);
  padding: 0.5rem;
  list-style: none;
  box-shadow: var(--shadow-elevated);
  z-index: 100;
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.aipz-header__menu > li {
  position: relative;
}

.aipz-header__menu > li:hover > .sub-menu,
.aipz-header__menu > li:focus-within > .sub-menu {
  display: block;
  opacity: 1;
  transform: translateY(0);
}

.aipz-header__menu .sub-menu a {
  display: flex;
  align-items: center;
  padding: 0.5rem 0.75rem;
  color: var(--aipz-text-secondary);
  text-decoration: none;
  font-size: var(--text-small);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), color var(--transition-fast);
  min-height: 40px;
}

.aipz-header__menu .sub-menu a:hover {
  background: var(--aipz-surface-3);
  color: var(--aipz-accent-teal);
}

/* --- Header Actions --- */
.aipz-header__actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.aipz-header__search-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  background: var(--aipz-surface-2);
  border: 1px solid var(--aipz-border);
  border-radius: var(--radius-md);
  color: var(--aipz-text-muted);
  cursor: pointer;
  transition: border-color var(--transition-fast), color var(--transition-fast);
  min-height: 44px;
  font-family: var(--aipz-font-family);
}

.aipz-header__search-btn:hover {
  border-color: var(--aipz-accent-teal);
  color: var(--aipz-accent-teal);
}

.aipz-header__kbd {
  display: inline-flex;
  align-items: center;
  padding: 0.125rem 0.375rem;
  background: var(--aipz-surface-3);
  border-radius: 4px;
  font-size: var(--text-xs);
  color: var(--aipz-text-muted);
  font-family: var(--aipz-font-family);
  border: none;
  line-height: 1;
}

/* --- Hamburger --- */
.aipz-header__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: none;
  border: none;
  cursor: pointer;
}

.aipz-header__hamburger-line {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--aipz-text-primary);
  border-radius: 1px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* ==========================================================================
   Search Overlay
   ========================================================================== */

.aipz-search-overlay {
  position: fixed;
  inset: 0;
  z-index: 10001;
  display: none;
}

.aipz-search-overlay.is-active {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 20vh;
}

.aipz-search-overlay__backdrop {
  position: fixed;
  inset: 0;
  background: rgba(12, 12, 24, 0.8);
  backdrop-filter: blur(4px);
}

.aipz-search-overlay__content {
  position: relative;
  width: 100%;
  max-width: 640px;
  padding: 0 var(--container-padding);
}

.aipz-search-overlay__input {
  width: 100%;
  padding: 1.25rem 1.5rem;
  background: var(--aipz-surface-3);
  border: 1px solid var(--aipz-border);
  border-radius: var(--radius-xl);
  color: var(--aipz-text-primary);
  font-size: var(--text-h3);
  font-family: var(--aipz-font-family);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  min-height: 56px;
}

.aipz-search-overlay__input:focus {
  outline: none;
  border-color: var(--aipz-accent-teal);
  box-shadow: 0 0 0 3px var(--aipz-glow-teal);
}

.aipz-search-overlay__input::placeholder {
  color: var(--aipz-text-muted);
}

.aipz-search-overlay__hint {
  text-align: center;
  margin-top: 0.75rem;
  font-size: var(--text-small);
  color: var(--aipz-text-muted);
}

.aipz-search-overlay__hint kbd {
  display: inline-flex;
  align-items: center;
  padding: 0.125rem 0.5rem;
  background: var(--aipz-surface-2);
  border-radius: 4px;
  font-size: var(--text-xs);
  font-family: var(--aipz-font-family);
  border: none;
}

/* ==========================================================================
   Mobile Drawer
   ========================================================================== */

.aipz-mobile-drawer {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: none;
}

.aipz-mobile-drawer.is-open {
  display: flex;
}

.aipz-mobile-drawer__backdrop {
  position: fixed;
  inset: 0;
  background: rgba(12, 12, 24, 0.7);
}

.aipz-mobile-drawer__panel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 300px;
  max-width: 85vw;
  background: var(--aipz-surface-1);
  border-left: 1px solid var(--aipz-border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  z-index: 1;
}

.aipz-mobile-drawer__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--aipz-border);
}

.aipz-mobile-drawer__close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  color: var(--aipz-text-secondary);
  cursor: pointer;
  border-radius: var(--radius-md);
}

.aipz-mobile-drawer__close:hover {
  color: var(--aipz-text-primary);
  background: var(--aipz-surface-2);
}

.aipz-mobile-drawer__nav {
  padding: 1rem 0;
}

.aipz-mobile-drawer__menu {
  list-style: none;
  padding: 0;
  margin: 0;
}

.aipz-mobile-drawer__menu a {
  display: flex;
  align-items: center;
  padding: 0.75rem 1.25rem;
  color: var(--aipz-text-secondary);
  text-decoration: none;
  font-size: var(--text-body);
  transition: color var(--transition-fast), background var(--transition-fast);
  min-height: 44px;
}

.aipz-mobile-drawer__menu a:hover {
  color: var(--aipz-accent-teal);
  background: var(--aipz-surface-2);
}

.aipz-mobile-drawer__menu .sub-menu {
  display: none;
  list-style: none;
  padding: 0;
  margin: 0;
  background: var(--aipz-surface-0);
}

.aipz-mobile-drawer__menu .sub-menu.is-open {
  display: block;
}

.aipz-mobile-drawer__menu .sub-menu a {
  padding-left: 2.5rem;
  font-size: var(--text-small);
}

.aipz-mobile-submenu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  color: var(--aipz-text-muted);
  cursor: pointer;
  position: absolute;
  right: 0;
  top: 0;
}

.aipz-mobile-submenu-toggle[aria-expanded="true"] svg {
  transform: rotate(180deg);
}

.aipz-mobile-drawer__menu .menu-item-has-children {
  position: relative;
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 768px) {
  .aipz-header {
    height: 56px;
  }
  .aipz-site-content {
    padding-top: 56px;
  }
  .aipz-header__nav {
    display: none;
  }
  .aipz-header__hamburger {
    display: flex;
  }
  .aipz-header__kbd {
    display: none;
  }
}