/**
 * 🧭 Unified Navigation System
 * Combines all navigation styles using design tokens
 * Mobile-first, accessible, Guardian Framework compliant
 */

/* =================================================================
   BASE NAVIGATION STYLES
   ================================================================= */

/* Navigation header */
.nav-header {
  background: var(--color-nav-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-purple-500-10);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-50);
  transition: all var(--transition-slower) var(--ease-out-cubic);
  box-shadow: var(--shadow-xs);
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
}

/* Scroll state */
.nav-header.scrolled {
  box-shadow: var(--shadow-sm);
  border-bottom-color: rgba(168, 85, 247, 0.05);
}

/* Container */
.nav-header .container {
  padding-top: var(--space-4);
  padding-bottom: var(--space-4);
}

/* Logo container */
.logo-container {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin: 0;
}

.logo-container img {
  width: var(--space-12);
  height: var(--space-12);
}

/* Navigation links */
.nav-link {
  color: var(--color-gray-700);
  font-weight: var(--font-medium);
  padding: var(--nav-link-padding);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast) var(--ease-out);
  text-decoration: none;
  display: inline-block;
  white-space: nowrap;
}

.nav-link:hover {
  color: var(--color-purple-600);
  background: var(--color-purple-50);
  transform: translateY(-1px);
}

/* CTA button */
.nav-cta {
  background: var(--color-purple-600);
  color: var(--color-white);
  padding: var(--space-2-5) var(--space-5);
  border-radius: var(--radius-md);
  font-weight: var(--font-medium);
  transition: all var(--transition-base) var(--ease-out);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  display: inline-block;
}

.nav-cta:hover {
  background: var(--color-purple-700);
  transform: translateY(-1px);
  box-shadow: var(--shadow-purple);
}

/* =================================================================
   RESOURCES DROPDOWN
   ================================================================= */

.resources-dropdown {
  position: relative;
}

.resources-trigger {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  color: var(--color-gray-700);
  font-weight: var(--font-medium);
  padding: var(--nav-link-padding);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast) var(--ease-out);
  border-radius: var(--radius-md);
}

.resources-trigger:hover {
  color: var(--color-purple-600);
  background: var(--color-purple-50);
}

.resources-trigger svg {
  width: var(--space-4);
  height: var(--space-4);
  transition: transform var(--transition-fast) var(--ease-out);
}

.resources-trigger[aria-expanded="true"] svg {
  transform: rotate(180deg);
}

/* Dropdown content */
.dropdown-content {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  margin-top: var(--space-2);
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-dropdown);
  min-width: 280px;
  padding: var(--space-2);
  opacity: 0;
  visibility: hidden;
  transform: translateX(-50%) translateY(-10px);
  transition: all var(--transition-base) var(--ease-out-cubic);
  z-index: var(--z-40);
}

.resources-dropdown:hover .dropdown-content,
.resources-dropdown:focus-within .dropdown-content {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.dropdown-item {
  display: block;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast) var(--ease-out);
  text-decoration: none;
  color: var(--color-gray-700);
}

.dropdown-item:hover {
  background: var(--color-purple-50);
}

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

.dropdown-item-icon {
  font-size: var(--text-xl);
  width: var(--space-6);
  text-align: center;
  flex-shrink: 0;
}

.dropdown-item-text .title {
  font-weight: var(--font-medium);
  color: var(--color-gray-900);
  display: block;
  margin-bottom: var(--space-0-5);
}

.dropdown-item-text .subtitle {
  font-size: var(--text-sm);
  color: var(--color-gray-600);
  line-height: var(--leading-tight);
}

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

/* Mobile menu button - Mobile first approach */
.mobile-menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--space-11);
  height: var(--space-11);
  padding: var(--space-2);
  background: transparent;
  border: none;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast) var(--ease-out);
}

.mobile-menu-toggle:hover {
  background: var(--color-purple-500-10);
}

/* Mobile menu panel */
.mobile-menu-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: var(--mobile-menu-width);
  max-width: 85vw;
  height: 100vh;
  background: var(--color-white);
  box-shadow: var(--shadow-mobile-menu);
  z-index: var(--z-modal);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  transform: translateX(100%);
  transition: transform var(--transition-slow) var(--ease-out), 
              visibility 0s linear var(--transition-slow), 
              opacity var(--transition-slow) var(--ease-out);
}

.mobile-menu-panel.menu-open {
  transform: translateX(0);
  transition: transform var(--transition-slow) var(--ease-out), 
              visibility 0s linear 0s, 
              opacity var(--transition-slow) var(--ease-out);
}

/* Mobile menu header */
.mobile-menu-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-5) var(--space-5) var(--space-4);
  border-bottom: 2px solid var(--color-purple-100);
  background: var(--color-purple-25);
  position: relative;
}

/* Add subtle gradient to header */
.mobile-menu-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-purple);
}

.mobile-menu-header span {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--color-purple-700);
}

/* Mobile menu close button */
.mobile-menu-close {
  width: var(--space-10);
  height: var(--space-10);
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color var(--transition-fast);
  padding: var(--space-2);
}

.mobile-menu-close:hover {
  background: var(--color-gray-100);
}

/* Mobile navigation links */
.mobile-nav-link {
  display: block;
  position: relative;
  padding: var(--space-4) var(--space-5);
  color: var(--color-gray-700);
  text-decoration: none;
  font-weight: var(--font-medium);
  font-size: var(--text-base);
  letter-spacing: -0.01em;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast) var(--ease-out);
  margin-bottom: var(--space-3);
  position: relative;
  min-height: var(--space-11);
  display: flex;
  align-items: center;
  border: 1px solid transparent;
}

/* Add subtle separation between nav items */
.mobile-nav-link:not(:last-child)::after {
  content: '';
  position: absolute;
  bottom: calc(var(--space-2) * -1);
  left: var(--space-5);
  right: var(--space-5);
  height: 1px;
  background: var(--color-gray-100);
}

.mobile-nav-link:hover {
  background: var(--color-purple-50);
  color: var(--color-purple-700);
  border-color: var(--color-purple-200);
  transform: translateX(2px);
}

/* Active/current page state */
.mobile-nav-link.active {
  background: var(--color-purple-100);
  color: var(--color-purple-800);
  font-weight: var(--font-semibold);
}

/* Mobile resources section */
.resources-mobile {
  margin: var(--space-3) 0;
  background: var(--color-gray-50);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-gray-100);
  overflow: hidden;
}

.mobile-resources-toggle {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-4) var(--space-5);
  color: var(--color-gray-700);
  font-weight: var(--font-medium);
  font-size: var(--text-base);
  letter-spacing: -0.01em;
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast) var(--ease-out);
  text-align: left;
  min-height: var(--space-11);
}

.mobile-resources-toggle:hover {
  background: var(--color-purple-50);
  color: var(--color-purple-700);
}

.mobile-resources-submenu {
  padding-left: var(--space-2);
  margin-top: var(--space-0-5);
}

/* Mobile dropdown items */
.mobile-dropdown-item {
  display: flex;
  align-items: center;
  padding: var(--space-2-5) var(--space-3);
  margin: 0 var(--space-1) var(--space-1) var(--space-1);
  text-decoration: none;
  border-radius: var(--radius-md-sm);
  transition: all var(--transition-fast) var(--ease-out);
  color: var(--color-gray-700);
  min-height: var(--space-11);
}

.mobile-dropdown-item:hover {
  background: var(--color-purple-50);
}

/* Mobile menu overlay */
.mobile-menu-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-overlay);
  z-index: calc(var(--z-modal) - 1);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-slow) var(--ease-out);
}

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

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

/* Mobile styles */
@media (max-width: 767px) {
  body {
    padding-top: calc(var(--nav-height) - var(--space-4));
  }
  
  /* Hide desktop navigation */
  .nav-links,
  .nav-cta,
  .resources-dropdown {
    display: none;
  }
  
  /* Mobile menu button is already display: flex by default (line 198) */
  
  /* Mobile menu starts hidden */
  #mobile-menu {
    visibility: hidden;
    opacity: 0;
  }
}

/* Desktop styles */
@media (min-width: 768px) {
  body {
    padding-top: var(--nav-height);
  }
  
  /* Hide mobile menu panel and overlay on desktop */
  .mobile-menu-panel,
  .mobile-menu-overlay {
    display: none !important;
  }
  
  /* Mobile toggle button visibility is controlled by Tailwind's md:hidden class */
  
  /* Show desktop navigation */
  .nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-6);
  }
  
  /* Desktop-specific adjustments */
  .nav-header .container {
    padding-top: var(--space-5);
    padding-bottom: var(--space-5);
  }
}

/* =================================================================
   ACCESSIBILITY & FOCUS STATES
   ================================================================= */

.nav-link:focus-visible,
.nav-cta:focus-visible,
.resources-trigger:focus-visible,
.mobile-menu-toggle:focus-visible {
  outline: 3px solid var(--color-purple-500);
  outline-offset: 2px;
  box-shadow: var(--shadow-focus-ring-lg);
}

/* Skip to content link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-purple-600);
  color: var(--color-white);
  padding: var(--space-2) var(--space-4);
  text-decoration: none;
  border-radius: var(--radius-md);
  z-index: var(--z-modal);
}

.skip-link:focus {
  top: var(--space-4);
  left: var(--space-4);
}

/* =================================================================
   UTILITY CLASSES
   ================================================================= */

/* Navigation-specific hidden class to avoid conflicts */
.nav-hidden {
  display: none !important;
  visibility: hidden !important;
  opacity: 0 !important;
}

/* Menu open state - outside media query for proper cascade */
#mobile-menu.menu-open {
  visibility: visible !important;
  opacity: 1 !important;
  transition: opacity var(--transition-slow) var(--ease-out);
}

/* Fallback for JS failures */
#mobile-menu:not(.nav-hidden):not(.menu-open) {
  visibility: visible;
  opacity: 1;
}

/* Defensive CSS: Ensure critical navigation elements are visible */
.nav-header {
  display: block !important;
  visibility: visible !important;
  opacity: 1 !important;
}

/* Ensure mobile menu button visibility on mobile */
@media (max-width: 767px) {
  .mobile-menu-toggle:not(.md\\:hidden) {
    display: flex !important;
    visibility: visible !important;
    opacity: 1 !important;
  }
}

/* Mobile menu button styles */
.mobile-menu-panel .btn-base {
  margin-top: var(--space-4);
  width: 100%;
  text-align: center;
  justify-content: center;
}

/* Brand text gradient */
.brand-text {
  background: var(--gradient-purple);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: var(--font-bold);
}