/* ===========================================
   Navigation - Refined Design
   =========================================== */

.nav {
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  height: 100%;
  position: relative;
  z-index: 1;
}

/* Subtle gradient overlay on nav */
.nav::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, var(--color-primary-surface) 0%, transparent 30%, transparent 70%, var(--color-background) 100%);
  opacity: 0.4;
  pointer-events: none;
}

/* ===========================================
   Nav Header & Logo
   =========================================== */

.nav__header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
  position: relative;
}

.nav__logo {
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  letter-spacing: var(--tracking-tight);
}

.nav__logo-link {
  color: var(--color-text-emphasis);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  transition:
    opacity var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out);
}

.nav__logo-link:hover {
  opacity: 0.9;
  transform: translateX(2px);
}

/* Animated gradient accent for brand */
.nav__logo-link::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  box-shadow: 0 0 12px var(--color-primary-glow);
  animation: nav-pulse 3s ease-in-out infinite;
}

@keyframes nav-pulse {
  0%, 100% {
    box-shadow: 0 0 8px var(--color-primary-glow);
    transform: scale(1);
  }
  50% {
    box-shadow: 0 0 16px var(--color-primary-glow);
    transform: scale(1.1);
  }
}

/* ===========================================
   Nav Menu Container
   =========================================== */

.nav__menu {
  flex: 1;
  padding: var(--spacing-md);
  overflow-y: auto;
  position: relative;
}

/* Custom scrollbar for nav */
.nav__menu::-webkit-scrollbar {
  width: 4px;
}

.nav__menu::-webkit-scrollbar-track {
  background: transparent;
}

.nav__menu::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-full);
}

.nav__menu::-webkit-scrollbar-thumb:hover {
  background: var(--color-border-hover);
}

/* ===========================================
   Nav Sections
   =========================================== */

.nav__section {
  margin-bottom: var(--spacing-lg);
}

.nav__section-header {
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--color-text-subtle);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

/* Section header decorative line */
.nav__section-header::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--color-border-subtle) 0%, transparent 100%);
}

/* Section variants */
.nav__section--primary {
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--color-border-subtle);
}

.nav__section--secondary {
  margin-top: var(--spacing-md);
}

/* ===========================================
   Nav Items
   =========================================== */

.nav__item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--color-text-muted);
  text-decoration: none;
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  transition:
    background-color var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out),
    box-shadow var(--duration-fast) var(--ease-out);
  margin: 2px 0;
  position: relative;
  overflow: hidden;
}

/* Subtle gradient overlay on hover */
.nav__item::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--color-primary-surface) 0%, transparent 60%);
  opacity: 0;
  transition: opacity var(--duration-fast) var(--ease-out);
  pointer-events: none;
}

.nav__item:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
  transform: translateX(4px);
}

.nav__item:hover::before {
  opacity: 0.5;
}

/* Active state with enhanced styling */
.nav__item--active {
  background: var(--color-primary-surface);
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.nav__item--active::before {
  opacity: 1;
}

/* Active indicator bar with glow */
.nav__item--active::after {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 70%;
  background: var(--gradient-primary);
  border-radius: 0 var(--radius-full) var(--radius-full) 0;
  box-shadow: 0 0 8px var(--color-primary-glow);
}

.nav__item--active:hover {
  transform: none;
  background: var(--color-primary-surface);
}

/* ===========================================
   Nav Icons
   =========================================== */

.nav__icon {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  stroke-width: 1.75;
  fill: none;
  flex-shrink: 0;
  transition:
    transform var(--duration-fast) var(--ease-spring),
    stroke-width var(--duration-fast) var(--ease-out);
  position: relative;
  z-index: 1;
}

.nav__item:hover .nav__icon {
  transform: scale(1.15);
  stroke-width: 2;
}

.nav__item--active .nav__icon {
  stroke-width: 2;
}

/* ===========================================
   Nav Item Text
   =========================================== */

.nav__item-text {
  position: relative;
  z-index: 1;
}

/* ===========================================
   Nav Footer
   =========================================== */

.nav__footer {
  padding: var(--spacing-md);
  border-top: 1px solid var(--color-border);
  position: relative;
  background: var(--color-surface);
}

/* Subtle top gradient on footer */
.nav__footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 20px;
  background: linear-gradient(180deg, var(--color-border-subtle) 0%, transparent 100%);
  opacity: 0.3;
  pointer-events: none;
  transform: translateY(-100%);
}

/* ===========================================
   User Menu
   =========================================== */

.nav__user-menu {
  position: relative;
}

.nav__user-trigger {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  width: 100%;
  background: transparent;
  border: none;
  padding: var(--spacing-sm);
  border-radius: var(--radius-lg);
  color: var(--color-text);
  cursor: pointer;
  transition:
    background-color var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out);
}

.nav__user-trigger:hover {
  background: var(--color-surface-hover);
  transform: translateX(2px);
}

.nav__user-trigger:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--color-primary-surface);
}

/* ===========================================
   User Avatar
   =========================================== */

.nav__user-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  overflow: hidden;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: var(--shadow-sm), 0 0 8px var(--color-primary-glow);
  border: 2px solid var(--color-surface);
}

.nav__user-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Avatar initials fallback */
.nav__user-avatar span {
  color: white;
  font-size: var(--text-sm);
  font-weight: var(--font-bold);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

/* ===========================================
   User Info
   =========================================== */

.nav__user-info {
  min-width: 0;
  flex: 1;
  text-align: left;
}

.nav__user-name {
  font-weight: var(--font-semibold);
  font-size: var(--text-sm);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--color-text);
}

.nav__user-email {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav__user-chevron {
  width: 16px;
  height: 16px;
  stroke: var(--color-text-subtle);
  stroke-width: 2;
  fill: none;
  transition: transform var(--duration-normal) var(--ease-spring);
  flex-shrink: 0;
}

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

/* ===========================================
   User Dropdown
   =========================================== */

.nav__user-dropdown {
  position: absolute;
  bottom: 100%;
  left: 0;
  right: 0;
  margin-bottom: var(--spacing-sm);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  z-index: var(--z-dropdown);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px) scale(0.95);
  transition:
    opacity var(--duration-normal) var(--ease-out),
    transform var(--duration-normal) var(--ease-spring),
    visibility var(--duration-normal);
}

.nav__user-dropdown--open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.nav__user-dropdown-header {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface-hover);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.nav__user-dropdown-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav__user-dropdown-email {
  font-size: var(--text-sm);
  color: var(--color-text);
  font-weight: var(--font-semibold);
}

.nav__user-dropdown-account {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.nav__user-dropdown-menu {
  padding: var(--spacing-xs);
}

.nav__user-dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--color-text);
  text-decoration: none;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  transition:
    background-color var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out);
}

.nav__user-dropdown-item:hover,
.nav__user-dropdown-item:focus {
  background: var(--color-surface-hover);
  transform: translateX(4px);
}

.nav__user-dropdown-item--danger {
  color: var(--color-error);
}

.nav__user-dropdown-item--danger:hover {
  background: var(--color-error-surface);
}

.nav__user-dropdown-icon {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  stroke-width: 1.75;
  fill: none;
  transition: transform var(--duration-fast) var(--ease-out);
}

.nav__user-dropdown-item:hover .nav__user-dropdown-icon {
  transform: scale(1.1);
}

.nav__user-dropdown-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, var(--color-border) 50%, transparent 100%);
  margin: var(--spacing-xs) var(--spacing-md);
}

/* ===========================================
   Theme Toggle
   =========================================== */

.nav__theme-toggle {
  cursor: pointer;
}

.nav__theme-toggle--mobile-only {
  display: none;
}

/* ===========================================
   Responsive
   =========================================== */

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

  /* Show nav when parent container is open (mobile slide-in) */
  .app-layout__nav.is-open .nav {
    display: flex;
  }

  .nav__theme-toggle--mobile-only {
    display: flex;
  }

  .nav__user-dropdown {
    position: absolute;
    bottom: auto;
    top: 100%;
    left: var(--spacing-md);
    right: var(--spacing-md);
    margin-bottom: 0;
    margin-top: var(--spacing-xs);
  }
}

/* ===========================================
   Reduced Motion
   =========================================== */

@media (prefers-reduced-motion: reduce) {
  .nav__logo-link::before {
    animation: none;
  }

  .nav__item,
  .nav__item::before,
  .nav__icon,
  .nav__user-trigger,
  .nav__user-dropdown,
  .nav__user-dropdown-item,
  .nav__user-dropdown-icon,
  .nav__user-chevron {
    transition: none;
  }
}