/* Modern Header Styles */
.header {
  background: linear-gradient(135deg, var(--primary-800) 0%, var(--primary-900) 100%);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: all var(--transition-normal);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) 0;
  max-width: 1200px;
  margin: 0 auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: white;
  text-decoration: none;
  letter-spacing: -0.025em;
  transition: color var(--transition-fast);
}

.logo:hover {
  color: var(--primary-200);
}

/* Desktop Navigation */
.nav-desktop {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  color: rgba(255, 255, 255, 0.9);
  font-weight: 500;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
  text-decoration: none;
}

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

.nav-link.active {
  color: white;
  background-color: rgba(255, 255, 255, 0.15);
}

/* Header Actions (Dark Mode Toggle) */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Dropdown Styles */
.dropdown {
  position: relative;
}

.dropdown-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  cursor: pointer;
}

.dropdown-toggle::after {
  content: '▼';
  font-size: 0.75rem;
  transition: transform var(--transition-fast);
}

.dropdown:hover .dropdown-toggle::after {
  transform: rotate(180deg);
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  right: 0;
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--neutral-200);
  min-width: 200px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-normal);
  z-index: 1000;
}

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

.dropdown-item {
  display: block;
  padding: var(--space-3) var(--space-4);
  color: var(--neutral-700);
  text-decoration: none;
  transition: all var(--transition-fast);
  border-bottom: 1px solid var(--neutral-100);
}

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

.dropdown-item:hover {
  background-color: var(--primary-50);
  color: var(--primary-700);
}

/* Mobile Navigation */
.nav-mobile {
  display: none;
}

.mobile-menu-toggle {
  background: none;
  border: none;
  color: white;
  font-size: 1.5rem;
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.mobile-menu-toggle:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.mobile-menu {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--primary-800);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-20px);
  transition: all var(--transition-normal);
}

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

.mobile-nav-links {
  list-style: none;
  margin: 0;
  padding: var(--space-4) 0;
}

.mobile-nav-link {
  display: block;
  color: rgba(255, 255, 255, 0.9);
  padding: var(--space-3) var(--space-4);
  text-decoration: none;
  transition: all var(--transition-fast);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

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

.mobile-dropdown-items {
  background-color: rgba(0, 0, 0, 0.2);
  padding-left: var(--space-4);
}

.mobile-dropdown-item {
  display: block;
  color: rgba(255, 255, 255, 0.8);
  padding: var(--space-2) var(--space-4);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

.mobile-dropdown-item:hover {
  color: white;
}

/* Dark mode toggle button */
.dark-mode-toggle {
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.9);
  font-size: 1.25rem;
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
}

.dark-mode-toggle:hover {
  background-color: rgba(255, 255, 255, 0.1);
  color: white;
}

.dark-mode-toggle i {
  transition: transform var(--transition-normal);
}

.dark-mode-toggle:hover i {
  transform: rotate(15deg);
}

/* Mobile dark mode toggle */
.mobile-dark-mode-toggle {
  display: block;
  color: rgba(255, 255, 255, 0.9);
  padding: var(--space-3) var(--space-4);
  text-decoration: none;
  transition: all var(--transition-fast);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  cursor: pointer;
  background: none;
  border-left: none;
  border-right: none;
  border-top: none;
  width: 100%;
  text-align: left;
  font-size: 1rem;
}

.mobile-dark-mode-toggle:hover {
  background-color: rgba(255, 255, 255, 0.1);
  color: white;
}

.mobile-dark-mode-toggle i {
  margin-right: var(--space-2);
  width: 20px;
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-desktop {
    display: none;
  }
  
  .nav-mobile {
    display: flex;
    align-items: center;
    gap: var(--space-2);
  }
  
  .header-container {
    padding: var(--space-3) var(--space-4);
  }
  
  .logo {
    font-size: 1.25rem;
  }
}

/* Scroll Effect */
.header.scrolled {
  background: rgba(7, 89, 133, 0.95);
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow-lg);
}