/* Navigation Styles */

/* Desktop Sidebar Navigation */
.sidebar-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--color-white);
  box-shadow: var(--shadow-md);
  padding: var(--spacing-lg);
  z-index: var(--z-fixed);
  overflow-y: auto;
}

.nav-header {
  margin-bottom: var(--spacing-xl);
  text-align: center;
  padding-bottom: var(--spacing-md);
  border-bottom: 2px solid var(--color-secondary);
}

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

.nav-links li {
  margin-bottom: var(--spacing-xs);
}

.nav-link {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--color-text);
  text-decoration: none;
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
  font-weight: var(--font-weight-medium);
}

.nav-link:hover,
.nav-link:focus {
  background-color: var(--color-highlight);
  color: var(--color-white);
  transform: translateX(4px);
}

.nav-link.active {
  background-color: var(--color-primary);
  color: var(--color-white);
}

/* Mobile Navigation */
.mobile-nav-container {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-modal);
}

.menu-toggle {
  position: fixed;
  top: var(--spacing-md);
  left: var(--spacing-md);
  width: 44px;
  height: 44px;
  background: var(--color-white);
  border-radius: var(--border-radius-sm);
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 4px;
  z-index: var(--z-modal);
  transition: all var(--transition-fast);
}

.menu-toggle:hover {
  background: var(--color-highlight);
}

.menu-toggle:hover .hamburger-line {
  background: var(--color-white);
}

.hamburger-line {
  width: 20px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: all var(--transition-fast);
}

/* Hamburger animation when menu is open */
.menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

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

.menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

.mobile-nav {
  position: fixed;
  top: 0;
  left: -100%;
  width: 280px;
  height: 100vh;
  background: var(--color-white);
  box-shadow: var(--shadow-xl);
  padding: var(--spacing-lg);
  transition: left var(--transition-base);
  overflow-y: auto;
  z-index: var(--z-modal);
}

.mobile-nav.open {
  left: 0;
}

.mobile-nav-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-md);
  border-bottom: 2px solid var(--color-secondary);
}

.menu-close {
  width: 32px;
  height: 32px;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: var(--border-radius-sm);
  transition: background-color var(--transition-fast);
}

.menu-close:hover {
  background-color: var(--color-secondary);
}

.close-icon {
  font-size: 24px;
  color: var(--color-text);
}

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

.mobile-nav-links li {
  margin-bottom: var(--spacing-sm);
}

.mobile-nav-link {
  display: block;
  padding: var(--spacing-md);
  color: var(--color-text);
  text-decoration: none;
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-large);
}

.mobile-nav-link:hover,
.mobile-nav-link:focus {
  background-color: var(--color-highlight);
  color: var(--color-white);
}

.nav-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  z-index: var(--z-modal-backdrop);
}

.nav-backdrop.open {
  opacity: 1;
  visibility: visible;
}

/* Mobile navigation display */
@media (max-width: 768px) {
  .sidebar-nav {
    display: none;
  }
  
  .mobile-nav-container {
    display: block;
  }
}

/* Ensure sidebar is visible on desktop */
@media (min-width: 769px) {
  .sidebar-nav {
    display: block;
  }
  
  .mobile-nav-container {
    display: none;
  }
}

/* Focus styles for accessibility */
.nav-link:focus,
.mobile-nav-link:focus,
.menu-toggle:focus,
.menu-close:focus {
  outline: 2px solid var(--color-highlight);
  outline-offset: 2px;
}

/* Skip link for accessibility */
.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-tooltip);
  transition: top var(--transition-fast);
}

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