/**
 * Navigation Component Styles - Air Tasman Website
 * Shared navigation styles for header and mobile menu
 * @author Air Tasman Development Team
 * @version 1.0.0
 */

/* =============================================
   SITE HEADER
   ============================================= */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-dropdown);
  background: transparent;
  transition: var(--transition-medium);
  transition-property: background-color, box-shadow, backdrop-filter;
}

/* Scrolled state */
.site-header--scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
}

.site-header--scrolled .nav-link {
  color: var(--color-gray-800);
}

.site-header--scrolled .nav-logo img {
  filter: none;
}

/* =============================================
   PRIMARY NAVIGATION
   ============================================= */

.primary-nav {
  position: relative;
}

.nav-container {
  max-width: 1440px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-lg);
  min-height: 80px;
}

/* Logo */
.nav-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  z-index: 2;
}

.nav-logo img {
  height: auto;
  transition: var(--transition-fast);
  filter: brightness(0) invert(1); /* White logo on transparent header */
}

/* Desktop Navigation Menu */
.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: var(--space-lg);
}

.nav-item {
  position: relative;
}

.nav-link {
  display: block;
  padding: var(--space-sm) var(--space-md);
  color: var(--color-white);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-base);
  transition: var(--transition-fast);
  border-radius: var(--border-radius-sm);
  position: relative;
}

.nav-link:hover {
  color: var(--color-accent-gold);
  background: rgba(255, 255, 255, 0.1);
}

.nav-link:focus {
  outline: 2px solid var(--color-accent-gold);
  outline-offset: 2px;
}

.nav-link--active {
  color: var(--color-accent-gold);
}

.nav-link--active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: var(--space-md);
  right: var(--space-md);
  height: 2px;
  background: var(--color-accent-gold);
  border-radius: 1px;
}

/* =============================================
   USER ACTIONS
   ============================================= */

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* Language Selector */
.language-selector {
  position: relative;
}

.lang-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: var(--color-white);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: var(--transition-fast);
}

.lang-toggle:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
}

.lang-toggle:focus {
  outline: 2px solid var(--color-accent-gold);
  outline-offset: 2px;
}

.lang-menu {
  position: absolute;
  top: 100%;
  right: 0;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-lg);
  list-style: none;
  margin: var(--space-xs) 0 0;
  padding: var(--space-xs) 0;
  min-width: 100px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: var(--transition-fast);
  z-index: 10;
}

.language-selector:hover .lang-menu,
.lang-toggle[aria-expanded="true"] + .lang-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.lang-menu li {
  margin: 0;
}

.lang-menu a {
  display: block;
  padding: var(--space-xs) var(--space-sm);
  color: var(--color-gray-700);
  text-decoration: none;
  font-size: var(--font-size-sm);
  transition: var(--transition-fast);
}

.lang-menu a:hover {
  background: var(--color-gray-50);
  color: var(--color-primary);
}

/* Login Button */
.nav-actions .btn {
  min-width: auto;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  cursor: pointer;
  gap: 4px;
  z-index: 1001;
}

.hamburger-line {
  width: 24px;
  height: 2px;
  background: var(--color-white);
  transition: var(--transition-fast);
  transform-origin: center;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
  transform: rotate(45deg) translate(4px, 4px);
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
  transform: rotate(-45deg) translate(4px, -4px);
}

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

.mobile-nav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-medium);
}

.mobile-nav-overlay[aria-hidden="false"] {
  opacity: 1;
  visibility: visible;
}

.mobile-nav {
  position: absolute;
  top: 0;
  right: 0;
  width: 100%;
  max-width: 320px;
  height: 100vh;
  background: var(--color-white);
  transform: translateX(100%);
  transition: var(--transition-medium);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.mobile-nav-overlay[aria-hidden="false"] .mobile-nav {
  transform: translateX(0);
}

.mobile-nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.mobile-nav-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--color-gray-600);
  border-radius: var(--border-radius-sm);
  transition: var(--transition-fast);
}

.mobile-nav-close:hover {
  background: var(--color-gray-100);
  color: var(--color-gray-800);
}

.mobile-nav-menu {
  flex: 1;
  list-style: none;
  margin: 0;
  padding: var(--space-lg) 0;
}

.mobile-nav-menu li {
  margin-bottom: var(--space-xs);
}

.mobile-nav-menu a {
  display: block;
  padding: var(--space-md) var(--space-lg);
  color: var(--color-gray-800);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-lg);
  transition: var(--transition-fast);
  border-left: 3px solid transparent;
}

.mobile-nav-menu a:hover {
  background: var(--color-gray-50);
  border-left-color: var(--color-primary);
  color: var(--color-primary);
}

.mobile-nav-login {
  margin-top: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
  background: var(--color-primary) !important;
  color: var(--color-white) !important;
  border-left-color: var(--color-primary) !important;
  font-weight: var(--font-weight-semibold);
}

.mobile-nav-login:hover {
  background: var(--color-primary-dark) !important;
}

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

@media (max-width: 1023px) {
  .nav-menu {
    display: none;
  }
  
  .mobile-menu-toggle {
    display: flex;
  }
  
  .nav-container {
    min-height: 64px;
    padding: 0 var(--space-md);
  }
  
  .nav-logo img {
    width: 120px;
    height: 40px;
  }
}

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

/* =============================================
   ACCESSIBILITY ENHANCEMENTS
   ============================================= */

/* Skip link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--color-primary);
  color: var(--color-white);
  padding: 8px;
  text-decoration: none;
  border-radius: var(--border-radius-sm);
  z-index: var(--z-skip-link);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 6px;
}

/* High contrast mode */
@media (prefers-contrast: high) {
  .nav-link {
    border: 1px solid transparent;
  }
  
  .nav-link:hover,
  .nav-link:focus {
    border-color: currentColor;
  }
  
  .lang-toggle {
    border-width: 2px;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .site-header,
  .nav-link,
  .lang-toggle,
  .lang-menu,
  .hamburger-line,
  .mobile-nav-overlay,
  .mobile-nav {
    transition: none;
  }
}

/* Print styles */
@media print {
  .site-header {
    position: static;
    background: var(--color-white);
    box-shadow: none;
  }
  
  .nav-menu {
    display: none;
  }
  
  .nav-actions {
    display: none;
  }
  
  .mobile-menu-toggle {
    display: none;
  }
}