/**
 * VIT Bargarh - Header & Navigation Components
 * Version: 2.0.0
 *
 * Includes: Top Bar, Main Header, Navigation, Mobile Menu
 */

/* ================================================
   TOP BAR
   ================================================ */

.top-bar {
  background: var(--vit-dark);
  color: var(--vit-white);
  padding: var(--space-1) 0;
  font-size: var(--text-sm);
  position: relative;
  z-index: var(--z-sticky);
}

.top-bar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.top-bar-left {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  flex-wrap: wrap;
}

.top-bar-right {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* Contact Info */
.top-bar-contact {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.top-bar-contact-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--vit-white);
  opacity: 0.9;
  transition: opacity var(--duration-200) var(--ease-in-out);
}

.top-bar-contact-item:hover {
  opacity: 1;
}

.top-bar-contact-item i {
  font-size: var(--text-base);
  color: var(--vit-accent-orange);
}

.top-bar-contact-item a {
  color: inherit;
  text-decoration: none;
}

.top-bar-contact-item a:hover {
  text-decoration: underline;
}

/* Quick Links */
.top-bar-links {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.top-bar-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  background: rgba(255, 255, 255, 0.1);
  color: var(--vit-white);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--duration-200) var(--ease-in-out);
  white-space: nowrap;
}

.top-bar-link:hover {
  background: var(--vit-primary);
  color: var(--vit-white);
}

.top-bar-link i {
  font-size: var(--text-sm);
}

/* Accessibility Controls */
.accessibility-controls {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding-left: var(--space-4);
  border-left: 1px solid rgba(255, 255, 255, 0.2);
}

.accessibility-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: rgba(255, 255, 255, 0.1);
  color: var(--vit-white);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--duration-200) var(--ease-in-out);
}

.accessibility-btn:hover,
.accessibility-btn.active {
  background: var(--vit-accent-orange);
  color: var(--vit-white);
}

/* ================================================
   MAIN HEADER
   ================================================ */

.main-header {
  background: var(--vit-white);
  box-shadow: var(--shadow-sm);
  position: relative;
  z-index: 1100; /* Higher than mega menu (1000) to ensure dropdowns appear above page content */
}

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

/* Full-width header to align News Flash with hero sidebar */
.main-header > .container {
  max-width: 100%;
  padding-left: var(--space-4);
  padding-right: 0;
}

@media (min-width: 768px) {
  .main-header > .container {
    padding-left: var(--space-6);
  }
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-4) 0;
  gap: var(--space-6);
}

/* Logo & Branding */
.header-brand {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  text-decoration: none;
  flex-shrink: 0;
}

.header-logo {
  width: 65px;
  height: 65px;
  object-fit: contain;
}

.header-title {
  display: flex;
  flex-direction: column;
  gap: var(--space-0-5);
}

.header-title-odia {
  font-family: var(--font-headings);
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--vit-primary);
  line-height: 1.3;
}

.header-title-english {
  font-family: var(--font-headings);
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--vit-dark);
  line-height: 1.3;
}

@media (min-width: 1024px) {
  .header-logo {
    width: 70px;
    height: 70px;
  }

  .header-title-odia {
    font-size: var(--text-lg);
  }

  .header-title-english {
    font-size: var(--text-2xl);
  }
}

/* News Flash Widget - Aligned with Hero Sidebar (33.333%) */
.news-flash-widget {
  background: var(--vit-bg-light);
  border-left: 4px solid var(--vit-primary);
  border-radius: var(--radius-lg) 0 0 var(--radius-lg);
  padding: var(--space-3) var(--space-5);
  display: none;
  flex: 0 0 32.33%;
  max-width: 32.33%;
  box-sizing: border-box;
  margin-left: auto;
}

@media (min-width: 992px) {
  .news-flash-widget {
    display: block;
  }
}

.news-flash-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

.news-flash-icon {
  font-size: var(--text-lg);
}

.news-flash-label {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--vit-primary);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
}

.news-flash-content {
  position: relative;
  height: 24px;
  overflow: hidden;
}

.news-flash-item {
  opacity: 0;
  position: absolute;
  transition: opacity 0.5s ease-in-out;
  white-space: nowrap;
  text-overflow: ellipsis;
  overflow: hidden;
  width: 100%;
  font-size: var(--text-sm);
  color: var(--vit-dark-gray);
}

.news-flash-item.active {
  opacity: 1;
  position: relative;
}

.news-flash-item a {
  color: var(--vit-dark-gray);
  text-decoration: none;
}

.news-flash-item a:hover {
  color: var(--vit-primary);
  text-decoration: underline;
}

/* Responsive: hide on small screen */
@media (max-width: 991px) {
  .news-flash-widget {
    display: none;
  }
}


/* ================================================
   MAIN NAVIGATION
   ================================================ */

.main-nav {
  background: var(--vit-primary-gradient);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  box-shadow: var(--shadow-md);
}

.main-nav.scrolled {
  box-shadow: var(--shadow-lg);
}

.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative; /* Positioning context for mega menus */
}

/* Desktop Navigation */
.nav-menu {
  display: none;
  list-style: none;
  margin: 0;
  padding: 0;
}

@media (min-width: 1024px) {
  .nav-menu {
    display: flex;
    align-items: center;
  }
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-3) var(--space-3);
  color: var(--vit-white);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  text-decoration: none;
  white-space: nowrap;
  transition: all var(--duration-200) var(--ease-in-out);
}

.nav-link:hover,
.nav-link:focus {
  background: rgba(255, 255, 255, 0.1);
  color: var(--vit-white);
}

.nav-link i {
  font-size: var(--text-lg);
}

.nav-link .nav-arrow {
  font-size: 10px;
  transition: transform var(--duration-200) var(--ease-in-out);
}

.nav-item:hover > .nav-link .nav-arrow {
  transform: rotate(180deg);
}

/* Dropdown Menu */
.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 250px;
  background: #ffffff;
  background: var(--vit-white, #ffffff);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
  box-shadow: var(--shadow-xl, 0 10px 40px rgba(0, 0, 0, 0.15));
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--duration-200) var(--ease-out);
  list-style: none;
  margin: 0;
  padding: var(--space-2) 0;
  padding: 8px 0;
  z-index: 1000;
}

.nav-item:hover > .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-dropdown .nav-item {
  position: relative;
}

.nav-dropdown .nav-link {
  padding: 12px 20px;
  color: #334155;
  font-size: 14px;
}

.nav-dropdown .nav-link:hover {
  background: #f8fafc;
  color: #a51c30;
}

.nav-dropdown .nav-link i {
  color: #a51c30;
}

/* Nested Dropdown (3rd Level) */
.nav-dropdown .nav-dropdown {
  top: 0;
  left: 100%;
  border-radius: var(--radius-lg);
}

/* Dropdown opens left if near edge */
.nav-dropdown.dropdown-left {
  left: auto;
  right: 100%;
}

/* Dropdown Separator */
.nav-dropdown-divider {
  height: 1px;
  background: var(--vit-lighter-gray);
  margin: var(--space-2) var(--space-4);
}

/* ================================================
   MEGA MENU STYLES
   ================================================ */

.nav-item.has-mega {
  position: static;
}

.mega-menu {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  width: 100%;
  background: #ffffff;
  background: var(--vit-white, #ffffff);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--duration-300) var(--ease-out);
  z-index: 1000;
  border-top: 3px solid #a51c30;
  border-top: 3px solid var(--vit-primary, #a51c30);
}

.nav-item.has-mega:hover > .mega-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.mega-menu-inner {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  gap: var(--space-6, 24px);
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 24px;
  padding: var(--space-8, 32px) var(--space-6, 24px);
}

.mega-menu.mega-wide .mega-menu-inner {
  grid-template-columns: repeat(3, 1fr);
}

/* Mega Menu Column */
.mega-column {
  padding: 0;
}

.mega-column-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 16px;
  font-weight: 700;
  color: #0f172a;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid #a51c30;
}

.mega-column-title i {
  color: #a51c30;
  font-size: 20px;
}

/* Mega Links */
.mega-links {
  list-style: none;
  margin: 0;
  padding: 0;
}

.mega-links li {
  margin-bottom: var(--space-1);
}

.mega-links a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  color: #334155;
  font-size: 14px;
  text-decoration: none;
  border-radius: 6px;
  transition: all 0.2s ease;
}

.mega-links a:hover {
  background: #f8fafc;
  color: #a51c30;
  padding-left: 16px;
}

.mega-links a i {
  color: #a51c30;
  font-size: 18px;
  width: 20px;
  flex-shrink: 0;
}

/* Mega Divider */
.mega-links .mega-divider {
  height: 1px;
  background: var(--vit-lighter-gray);
  margin: var(--space-3) 0;
}

/* Scrollable Mega Links */
.mega-links.mega-scroll {
  max-height: 280px;
  overflow-y: auto;
  padding-right: var(--space-2);
}

.mega-links.mega-scroll::-webkit-scrollbar {
  width: 4px;
}

.mega-links.mega-scroll::-webkit-scrollbar-track {
  background: var(--vit-bg-light);
  border-radius: var(--radius-full);
}

.mega-links.mega-scroll::-webkit-scrollbar-thumb {
  background: var(--vit-primary);
  border-radius: var(--radius-full);
}

/* Highlighted Column */
.mega-column.mega-highlight {
  background: linear-gradient(135deg, var(--vit-primary) 0%, #1e3a5f 100%);
  color: var(--vit-white);
  padding: var(--space-5);
  border-radius: var(--radius-xl);
}

.mega-column.mega-highlight .mega-column-title {
  color: var(--vit-white);
  border-bottom-color: rgba(255, 255, 255, 0.3);
}

.mega-column.mega-highlight .mega-column-title i {
  color: var(--vit-accent-orange);
}

/* Mega Stats */
.mega-stats {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.mega-stat {
  text-align: center;
  padding: var(--space-3);
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
}

.mega-stat-number {
  display: block;
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  color: var(--vit-accent-orange);
  line-height: 1;
  margin-bottom: var(--space-1);
}

.mega-stat-label {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  opacity: 0.9;
}

/* Mega CTA */
.mega-cta-text {
  font-size: var(--text-sm);
  opacity: 0.9;
  margin-bottom: var(--space-4);
  line-height: 1.6;
}

.mega-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  background: var(--vit-accent-orange);
  color: var(--vit-white);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  text-decoration: none;
  border-radius: var(--radius-lg);
  transition: all var(--duration-200) var(--ease-in-out);
}

.mega-cta-btn:hover {
  background: var(--vit-white);
  color: var(--vit-primary);
  transform: translateX(4px);
}

/* Nav Link with Icon */
.nav-link i:first-child {
  font-size: var(--text-lg);
}

.nav-link span {
  display: inline;
}

/* CTA Button in Nav */
.nav-link.nav-cta {
  background: var(--vit-accent-orange);
  margin-left: var(--space-2);
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-5);
}

.nav-link.nav-cta:hover {
  background: #e67e22;
  transform: translateY(-2px);
}

/* Responsive Mega Menu */
@media (max-width: 1199px) {
  .mega-menu-inner {
    grid-template-columns: repeat(2, 1fr);
    padding: var(--space-6) var(--space-4);
  }

  .mega-menu.mega-wide .mega-menu-inner {
    grid-template-columns: repeat(2, 1fr);
  }

  .mega-column.mega-highlight {
    grid-column: span 2;
  }
}

@media (max-width: 1023px) {
  .mega-menu,
  .nav-item.has-mega > .mega-menu {
    display: none;
  }
}

/* ================================================
   MOBILE NAVIGATION TOGGLE
   ================================================ */

.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  gap: 5px;
}

@media (min-width: 1024px) {
  .nav-toggle {
    display: none;
  }
}

.nav-toggle-bar {
  width: 24px;
  height: 2px;
  background: var(--vit-white);
  border-radius: var(--radius-full);
  transition: all var(--duration-300) var(--ease-in-out);
}

.nav-toggle.active .nav-toggle-bar:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active .nav-toggle-bar:nth-child(2) {
  opacity: 0;
  transform: translateX(-10px);
}

.nav-toggle.active .nav-toggle-bar:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ================================================
   MOBILE MENU
   ================================================ */

.mobile-menu-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: var(--z-modal-backdrop);
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-300) var(--ease-out);
}

.mobile-menu-overlay.active {
  opacity: 1;
  visibility: visible;
}

.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  width: 300px;
  max-width: 85%;
  height: 100vh;
  background: var(--vit-white);
  z-index: var(--z-modal);
  transform: translateX(-100%);
  transition: transform var(--duration-300) var(--ease-out);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

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

/* Mobile Menu Header */
.mobile-menu-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4);
  background: var(--vit-primary-gradient);
  color: var(--vit-white);
}

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

.mobile-menu-logo {
  width: 40px;
  height: 40px;
  object-fit: contain;
  background: var(--vit-white);
  border-radius: var(--radius-md);
  padding: 4px;
}

.mobile-menu-title {
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
}

.mobile-menu-close {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.2);
  color: var(--vit-white);
  font-size: var(--text-xl);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background var(--duration-200) var(--ease-in-out);
}

.mobile-menu-close:hover {
  background: rgba(255, 255, 255, 0.3);
}

/* Mobile Menu Body */
.mobile-menu-body {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4);
}

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

.mobile-nav-item {
  border-bottom: 1px solid var(--vit-lighter-gray);
}

.mobile-nav-item:last-child {
  border-bottom: none;
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-2);
  color: var(--vit-dark);
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  text-decoration: none;
  transition: color var(--duration-200) var(--ease-in-out);
}

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

.mobile-nav-link i {
  color: var(--vit-primary);
  font-size: var(--text-lg);
}

.mobile-dropdown-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--vit-bg-gray);
  color: var(--vit-dark-gray);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--duration-200) var(--ease-in-out);
}

.mobile-dropdown-toggle:hover {
  background: var(--vit-primary);
  color: var(--vit-white);
}

.mobile-dropdown-toggle i {
  font-size: var(--text-sm);
  transition: transform var(--duration-200) var(--ease-in-out);
}

.mobile-nav-item.open > .mobile-nav-link-wrapper .mobile-dropdown-toggle i {
  transform: rotate(180deg);
}

.mobile-nav-link-wrapper {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.mobile-nav-link-wrapper .mobile-nav-link {
  flex: 1;
}

/* Mobile Dropdown */
.mobile-dropdown {
  display: none;
  list-style: none;
  margin: 0;
  padding: 0;
  padding-left: var(--space-4);
  background: var(--vit-bg-light);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-2);
}

.mobile-nav-item.open > .mobile-dropdown {
  display: block;
  animation: fadeIn var(--duration-200) var(--ease-out);
}

.mobile-dropdown .mobile-nav-link {
  padding: var(--space-2-5) var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--font-normal);
  color: var(--vit-dark-gray);
}

.mobile-dropdown .mobile-nav-link:hover {
  color: var(--vit-primary);
}

/* Nested Mobile Dropdown */
.mobile-dropdown .mobile-dropdown {
  margin-left: var(--space-3);
  background: var(--vit-white);
  border: 1px solid var(--vit-lighter-gray);
}

/* Mobile Menu Footer */
.mobile-menu-footer {
  padding: var(--space-4);
  border-top: 1px solid var(--vit-lighter-gray);
  background: var(--vit-bg-light);
}

.mobile-contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.mobile-contact-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: var(--vit-dark-gray);
}

.mobile-contact-item i {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--vit-primary);
  color: var(--vit-white);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
}

.mobile-contact-item a {
  color: inherit;
  text-decoration: none;
}

.mobile-contact-item a:hover {
  color: var(--vit-primary);
}

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

@media (max-width: 639px) {
  .top-bar-inner {
    justify-content: center;
  }

  .top-bar-left {
    display: none;
  }

  .top-bar-links {
    justify-content: center;
  }

  .header-inner {
    padding: var(--space-3) 0;
  }

  .header-title-odia {
    display: none;
  }

  .header-title-english {
    font-size: var(--text-lg);
  }
}

@media (max-width: 767px) {
  .accessibility-controls {
    display: none;
  }

  .top-bar-link span {
    display: none;
  }
}

@media (min-width: 1280px) {
  .nav-link {
    padding: var(--space-4) var(--space-5);
    font-size: var(--text-base);
  }
}

/* ================================================
   SEARCH WIDGET (Optional)
   ================================================ */

.header-search {
  position: relative;
  display: none;
}

@media (min-width: 768px) {
  .header-search {
    display: block;
  }
}

.search-toggle {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--vit-white);
  font-size: var(--text-xl);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background var(--duration-200) var(--ease-in-out);
}

.search-toggle:hover {
  background: rgba(255, 255, 255, 0.1);
}

.search-dropdown {
  position: absolute;
  top: calc(100% + var(--space-2));
  right: 0;
  width: 300px;
  background: var(--vit-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  padding: var(--space-4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--duration-200) var(--ease-out);
  z-index: var(--z-dropdown);
}

.search-dropdown.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.search-input-wrapper {
  position: relative;
}

.search-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  padding-right: var(--space-10);
  font-size: var(--text-base);
  border: 2px solid var(--vit-lighter-gray);
  border-radius: var(--radius-lg);
  transition: border-color var(--duration-200) var(--ease-in-out);
}

.search-input:focus {
  outline: none;
  border-color: var(--vit-primary);
}

.search-submit {
  position: absolute;
  top: 50%;
  right: var(--space-3);
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--vit-primary);
  font-size: var(--text-xl);
  cursor: pointer;
}