/**
 * TiorAI Header Styles
 * BEM naming convention with CSS custom properties
 */

/* ============================================================================
   CSS Custom Properties (Design Tokens)
   ========================================================================== */

/* Using global theme variables from theme-unified.css */


/* ============================================================================
   Header Component
   ========================================================================== */

.header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky); /* T1.8: was literal 999 — use the semantic z-index scale */
  background-color: var(--surface-base);
  border-bottom: 1px solid var(--border-default);
  transition: box-shadow 0.2s ease;
}

.header--shadow {
  box-shadow: var(--shadow-md);
}

.header__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--space-4);
  height: 4rem;
}

@media (min-width: 768px) {
  .header__container {
    padding: 0 var(--space-6);
  }
}

/* ============================================================================
   Logo
   ========================================================================== */

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

.header__logo-link {
  display: flex;
  align-items: center;
  text-decoration: none;
  color: var(--color-text-primary);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-lg);
}

.header__logo-link:focus {
  outline: none;
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.header__logo-image {
  height: 2rem;
  width: auto;
}

/* ============================================================================
   Navigation - Desktop
   ========================================================================== */

.header__nav {
  display: none;
}

.header__nav--desktop {
  display: none;
}

@media (min-width: 64rem) {
  .header__nav--desktop {
    display: flex;
    flex: 1;
    justify-content: center;
    margin: 0 var(--space-8);
  }
}

.nav-primary {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-primary__item {
  position: relative;
}

.nav-primary__link {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-md);
  transition: color 0.2s ease, background-color 0.2s ease;
  background: transparent;
  border: none;
  cursor: pointer;
  font-size: var(--font-size-base);
  min-height: 44px;
}

.nav-primary__link:hover,
.nav-primary__link:focus {
  color: var(--color-text-primary);
  background-color: var(--color-bg-secondary);
}

.nav-primary__link:focus {
  outline: none;
  outline-offset: 2px;
}

/* T19.2 — visible active (current-section) state. */
.nav-primary__link--active {
  position: relative;
  color: var(--color-text-primary);
  font-weight: var(--font-weight-semibold);
}

.nav-primary__link--active::before {
  content: "";
  position: absolute;
  left: var(--space-3);
  right: var(--space-3);
  bottom: 4px;
  height: 2px;
  border-radius: var(--radius-full, 999px);
  background-color: var(--color-brand, currentColor);
}

/* Dropdown Wrapper - Contains both link and toggle */
.nav-primary__dropdown-wrapper {
  display: flex;
  align-items: center;
  gap: 0;
}

.nav-primary__link--dropdown {
  padding-right: var(--space-2);
}

.nav-primary__dropdown-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-2);
  background: transparent;
  border: none;
  color: var(--color-text-secondary);
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: color 0.2s ease, background-color 0.2s ease;
  min-height: 44px;
  min-width: 44px;
}

.nav-primary__dropdown-toggle:hover,
.nav-primary__dropdown-toggle:focus {
  color: var(--color-text-primary);
  background-color: var(--color-bg-secondary);
}

.nav-primary__dropdown-toggle:focus {
  outline: none;
  outline-offset: 2px;
}

.nav-primary__dropdown-icon {
  transition: transform 0.2s ease;
  pointer-events: none;
}

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

/* Dropdown */
.nav-primary__dropdown {
  position: absolute;
  top: calc(100% + var(--space-2));
  left: 0;
  min-width: 200px;
  background-color: var(--surface-base);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-default);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity 0.2s ease, visibility 0.2s ease, transform 0.2s ease;
  z-index: var(--z-dropdown);
  list-style: none;
  margin: 0;
  padding: var(--space-2);
}

.nav-primary__item--dropdown:hover .nav-primary__dropdown,
.nav-primary__item--dropdown:focus-within .nav-primary__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-primary__dropdown-item {
  margin: 0;
}

.nav-primary__dropdown-link {
  display: block;
  padding: var(--space-3) var(--space-4);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: color 0.2s ease, background-color 0.2s ease;
  min-height: 44px;
  display: flex;
  align-items: center;
}

.nav-primary__dropdown-link:hover,
.nav-primary__dropdown-link:focus {
  color: var(--color-text-primary);
  background-color: var(--color-bg-secondary);
}

.nav-primary__dropdown-link:focus {
  outline: none;
  outline-offset: 2px;
}

/* ============================================================================
   Header Actions
   ========================================================================== */

.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.header__action-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: color 0.2s ease, background-color 0.2s ease;
}

.header__action-btn:hover,
.header__action-btn:focus {
  color: var(--color-text-primary);
  background-color: var(--color-bg-secondary);
}

.header__action-btn:focus {
  outline: none;
  outline-offset: 2px;
}

.header__action-icon {
  width: 20px;
  height: 20px;
}

/* Theme Toggle (Simple Button - No Dropdown) */
.header__theme-toggle {
  position: relative;
}

.theme-toggle__icon {
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.theme-toggle__icon--sun {
  display: none;
  /* Hidden by default, shown in dark mode */
}

.theme-toggle__icon--moon {
  display: block;
  /* Shown by default (light mode) */
}

/* Animation on toggle */
.header__theme-toggle:active .theme-toggle__icon {
  transform: rotate(20deg);
}

/* CTA Buttons */
.header__ctas {
  display: none;
  gap: var(--space-3);
}

.header__ctas--desktop {
  display: none;
}

@media (min-width: 64rem) {
  .header__ctas--desktop {
    display: flex;
    align-items: center;
  }
}

.header__cta {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  transition: all 0.2s ease;
  height: 44px;
  padding: 10px 40px;
  box-shadow: none;
  border: none;
  font-size: 0.8rem;
}

.header__cta--secondary {
  background: var(--surface-card);
  color: white;
  border: 1px solid var(--border-default);
  backdrop-filter: blur(10px);
}

.header__cta--secondary:hover {
  color: var(--color-text-primary);
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

.header__cta:focus {
  outline: none;
  outline-offset: 2px;
}

/* Mobile Toggle */
.header__mobile-toggle {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  cursor: pointer;
  gap: 4px;
  border-radius: var(--radius-md);
  transition: background-color 0.2s ease;
}

.header__mobile-toggle:hover,
.header__mobile-toggle:focus {
  background-color: var(--color-bg-secondary);
}

.header__mobile-toggle:focus {
  outline: none;
  outline-offset: 2px;
}

.header__mobile-toggle--desktop-hidden {
  display: flex;
}

@media (min-width: 64rem) {
  .header__mobile-toggle--desktop-hidden {
    display: none;
  }
}

.header__mobile-toggle-bar {
  width: 20px;
  height: 2px;
  background-color: var(--color-text-secondary);
  border-radius: 2px;
  transition: all 0.2s ease;
  transform-origin: center;
}

.header__mobile-toggle[aria-expanded="true"] .header__mobile-toggle-bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

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

.header__mobile-toggle[aria-expanded="true"] .header__mobile-toggle-bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}


/* ============================================================================
   Search Popup Modal
   ========================================================================== */

.search-popup {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-8) var(--space-4);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease;
}

.search-popup.is-open,
.search-popup[aria-hidden="false"] {
  opacity: 1;
  visibility: visible;
}

.search-popup__backdrop {
  position: absolute;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
}

.search-popup__container {
  position: relative;
  width: 100%;
  max-width: 560px;
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-default);
  box-shadow: 0 25px 50px -12px rgb(0 0 0 / 0.5), 0 8px 16px -8px rgb(0 0 0 / 0.3);
  transform: scale(0.95) translateY(-8px);
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
}

.search-popup.is-open .search-popup__container,
.search-popup[aria-hidden="false"] .search-popup__container {
  transform: scale(1) translateY(0);
}

.search-popup__header {
  padding: var(--space-6);
}

.search-popup__search-row {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.search-popup__search-icon {
  width: 20px;
  height: 20px;
  color: var(--color-text-secondary);
  flex-shrink: 0;
}

.search-popup__input {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--color-text-primary);
  font-size: 18px;
  font-weight: 400;
  outline: none;
  min-height: 24px;
  transition: transform 0.2s ease;
  box-shadow: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
}

.search-popup__input:focus {
  transform: scale(1.02);
  border: none;
  outline: none;
  box-shadow: none;
}

.search-popup__input::placeholder {
  color: var(--color-text-tertiary);
  font-weight: 400;
}

.search-popup__close-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
  flex-shrink: 0;
}

.search-popup__close-btn svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
}

.search-popup__close-btn:hover {
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--color-text-primary);
}

.search-popup__close-btn:focus {
  outline: none;
  outline-offset: 2px;
}

.search-popup__footer {
  padding: 0 var(--space-6) var(--space-6) var(--space-6);
}

.search-popup__helper-text {
  margin: 0;
  font-size: 14px;
  color: var(--color-text-tertiary);
  font-weight: 400;
  text-align: left;
}

.search-popup__results {
  max-height: 400px;
  overflow-y: auto;
  border-top: 1px solid var(--border-default);
}

.search-popup__section {
  padding: var(--space-4);
}

.search-popup__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.search-popup__item {
  margin: 0;
}

.search-popup__link,
.search-popup__button {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-3) var(--space-4);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
  background: transparent;
  border: none;
  cursor: pointer;
  text-align: left;
  min-height: 44px;
  font-size: 15px;
}

.search-popup__link:hover,
.search-popup__link:focus,
.search-popup__button:hover,
.search-popup__button:focus {
  color: var(--color-text-primary);
  background-color: var(--border-default);
}

.search-popup__link:focus,
.search-popup__button:focus {
  outline: none;
  outline-offset: 2px;
}

/* Responsive Design */
@media (max-width: 640px) {
  .search-popup {
    padding: var(--space-4);
  }

  .search-popup__container {
    max-width: 100%;
  }

  .search-popup__input {
    font-size: 16px;
  }

  .search-popup__header {
    padding: var(--space-5);
  }

  .search-popup__footer {
    padding: 0 var(--space-5) var(--space-5) var(--space-5);
  }
}

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

.mobile-drawer {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.mobile-drawer--open {
  opacity: 1;
  visibility: visible;
}

.mobile-drawer__backdrop {
  position: absolute;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
}

.mobile-drawer__container {
  position: relative;
  height: 100%;
  width: 100%;
  max-width: 400px;
  background-color: var(--surface-base);
  transform: translateX(-100%);
  transition: transform 0.3s ease;
  display: flex;
  flex-direction: column;
}

.mobile-drawer--open .mobile-drawer__container {
  transform: translateX(0);
}

.mobile-drawer__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--border-default);
}

.mobile-drawer__logo-link {
  display: flex;
  align-items: center;
  text-decoration: none;
  color: var(--color-text-primary);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-lg);
}

.mobile-drawer__logo-image {
  height: 2rem;
  width: auto;
}

.mobile-drawer__close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: color 0.2s ease, background-color 0.2s ease;
}

.mobile-drawer__close:hover,
.mobile-drawer__close:focus {
  color: var(--color-text-primary);
  background-color: var(--color-bg-secondary);
}

.mobile-drawer__close:focus {
  outline: none;
  outline-offset: 2px;
}

.mobile-drawer__nav {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-6);
}

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

.mobile-drawer__item {
  margin-bottom: var(--space-4);
}

.mobile-drawer__item--section {
  margin-bottom: var(--space-6);
}

.mobile-drawer__section-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-3);
}

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

.mobile-drawer__subitem {
  margin-bottom: var(--space-2);
}

.mobile-drawer__link {
  display: flex;
  align-items: center;
  padding: var(--space-3) var(--space-4);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: color 0.2s ease, background-color 0.2s ease;
  min-height: 44px;
}

.mobile-drawer__link:hover,
.mobile-drawer__link:focus {
  color: var(--color-text-primary);
  background-color: var(--color-bg-secondary);
}

.mobile-drawer__link:focus {
  outline: none;
  outline-offset: 2px;
}

.mobile-drawer__footer {
  padding: var(--space-6);
  border-top: 1px solid var(--border-default);
}

.mobile-drawer__theme-section {
  margin-bottom: var(--space-6);
}

.mobile-drawer__theme-options {
  display: flex;
  gap: var(--space-3);
}

.mobile-drawer__theme-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: transparent;
  border: 1px solid var(--border-default);
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s ease;
  flex: 1;
  justify-content: center;
  font-size: var(--font-size-sm);
  min-height: 44px;
}

.mobile-drawer__theme-btn:hover,
.mobile-drawer__theme-btn:focus {
  color: var(--color-text-primary);
  background-color: var(--color-bg-secondary);
  border-color: var(--border-strong);
}

.mobile-drawer__theme-btn:focus {
  outline: none;
  outline-offset: 2px;
}

.mobile-drawer__theme-btn--active {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: white;
}

.mobile-drawer__ctas {
  display: flex;
  gap: var(--space-3);
}

.mobile-drawer__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
  transition: all 0.2s ease;
  flex: 1;
  min-height: 44px;
}

.mobile-drawer__cta--primary {
  background-color: var(--color-accent);
  color: white;
  border: 1px solid var(--color-accent);
}

.mobile-drawer__cta--primary:hover {
  background-color: var(--color-accent-hover);
  border-color: var(--border-strong);
}

.mobile-drawer__cta--secondary {
  background-color: transparent;
  color: var(--color-text-primary);
  border: 1px solid var(--border-default);
}

.mobile-drawer__cta--secondary:hover {
  background-color: var(--color-bg-secondary);
  border-color: var(--border-strong);
}

.mobile-drawer__cta:focus {
  outline: none;
  outline-offset: 2px;
}

/* ============================================================================
   Utilities & Accessibility
   ========================================================================== */

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  /* High contrast colors handled by global theme */
}

/* Focus visible polyfill support */
.header *:focus:not(:focus-visible) {
  outline: none;
}

/* Screen reader only content */
.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;
}