/* ============================================
   Header Styles
   ============================================ */

.header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.8);
  transition: all var(--transition-base);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) 0;
  gap: var(--spacing-xl);
}

.logo-link {
  display: flex;
  align-items: center;
  text-decoration: none;
  transition: transform var(--transition-fast);
}

.logo {
  height: 40px;
  width: auto;
  max-width: 120px;
  object-fit: contain;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  list-style: none;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--color-text-primary);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
}

.nav-link:hover {
  color: var(--color-brand-purple-deep);
  background: var(--color-bg-secondary);
}

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

.nav-dropdown {
  position: relative;
}

.nav-dropdown .nav-link {
  padding-right: var(--spacing-sm);
}

.nav-dropdown .nav-link .material-icons-round {
  font-size: 1rem;
  transition: transform var(--transition-fast);
}

.nav-dropdown[aria-expanded="true"] .nav-link .material-icons-round {
  transform: rotate(180deg);
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + var(--spacing-sm));
  left: 0;
  min-width: 220px;
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-sm);
  list-style: none;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-base);
  z-index: var(--z-dropdown);
  max-height: 0;
  overflow: hidden;
}

.nav-dropdown[aria-expanded="true"] .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  max-height: 500px;
}

.dropdown-menu a {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--color-text-primary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  font-size: var(--font-size-sm);
}

.dropdown-menu a:hover {
  background: var(--color-bg-secondary);
  color: var(--color-brand-purple-deep);
}

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

.nav-login {
  font-size: var(--font-size-sm);
  padding: 0.5rem 1rem;
}

.mobile-menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  cursor: pointer;
  position: relative;
  z-index: calc(var(--z-modal) + 1);
  flex-shrink: 0;
}

body.nav-open {
  overflow: hidden;
}

/* Mobile Styles */
@media (max-width: 1024px) {
  .mobile-menu-toggle {
    display: flex;
  }
  
  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    max-width: 100%;
    background: var(--color-bg-primary);
    flex-direction: column;
    align-items: stretch;
    padding: var(--spacing-xl);
    gap: var(--spacing-md);
    transform: translateX(100%);
    transition: transform var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    z-index: var(--z-modal);
    box-shadow: var(--shadow-xl);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
  }
  
  .nav-menu.is-open,
  .nav-menu[aria-expanded="true"] {
    transform: translateX(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .nav-menu > li {
    width: 100%;
  }

  .nav-menu > li > .nav-link {
    width: 100%;
    justify-content: space-between;
  }
  
  .nav-dropdown .dropdown-menu {
    position: static;
    opacity: 0;
    visibility: hidden;
    max-height: 0;
    transform: none;
    box-shadow: none;
    border: none;
    background: var(--color-bg-secondary);
    margin-top: 0;
    margin-left: var(--spacing-md);
    padding: 0;
    transition: all var(--transition-base);
    overflow: hidden;
  }
  
  .nav-dropdown[aria-expanded="true"] .dropdown-menu {
    opacity: 1;
    visibility: visible;
    max-height: 500px;
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm);
  }
  
  .nav-actions {
    margin-left: auto;
  }
}

@media (max-width: 768px) {
  .navbar {
    padding: var(--spacing-sm) 0;
  }
  
  .logo {
    height: 32px;
  }
  
  .btn {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
  }
  
  .nav-menu {
    top: 60px;
    padding: var(--spacing-lg);
  }
}

@media (max-width: 480px) {
  .navbar {
    padding: var(--spacing-xs) 0;
  }
  
  .logo {
    height: 28px;
  }
  
  .mobile-menu-toggle {
    width: 44px;
    height: 44px;
    min-width: 44px;
    min-height: 44px;
  }

  .nav-actions .nav-login {
    display: none;
  }
  
  .nav-menu {
    top: 56px;
    padding: var(--spacing-md);
  }
  
  .nav-link {
    padding: var(--spacing-md);
    font-size: var(--font-size-base);
    min-height: 44px;
  }
  
  .btn {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    min-height: 44px;
  }
}