/**
 * Navigation Component
 * Restyled navbar with shadcn zinc palette and semantic tokens.
 *
 * On mobile (< 768px) the entire top bar is hidden and the app-style
 * bottom tab bar (see 23-bottom-nav.css) takes over navigation.
 */

.navbar {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--navbar-height);
  padding: 0 var(--space-4);
  background: var(--color-background);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition-fast);
}

.navbar--scrolled {
  box-shadow: var(--shadow-sm);
}

.navbar__brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.navbar__logo {
  display: flex;
  align-items: center;
}

.navbar__logo img {
  height: 32px;
  width: auto;
}

.navbar__nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  flex: 1;
  justify-content: flex-end;
}

@media (max-width: 767px) {
  .navbar {
    display: none;
  }
}

.navbar__item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-muted-foreground);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition:
    color var(--transition-fast),
    background var(--transition-fast);
  white-space: nowrap;
}

.navbar__item:hover {
  color: var(--color-foreground);
  background: var(--color-muted);
}

.navbar__item--active,
.navbar__item.up-current {
  color: var(--color-primary);
  background: var(--color-accent);
}

.navbar__actions {
  display: none;
}

.navbar__separator {
  height: 1px;
  background: var(--color-border);
  margin: var(--space-2) 0;
}

.navbar__user {
  display: flex;
  align-items: center;
  margin-left: var(--space-4);
}

@media (max-width: 767px) {
  .navbar__user {
    display: none;
  }
}

.navbar__dropdown {
  position: relative;
}

.navbar__dropdown-trigger {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition:
    background var(--transition-fast),
    border-color var(--transition-fast);
}

.navbar__dropdown-trigger:hover {
  background: var(--color-muted);
  border-color: var(--color-border);
}

.navbar__dropdown-trigger img,
.navbar__dropdown-trigger .avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  object-fit: cover;
}

.navbar__dropdown-menu {
  position: absolute;
  top: calc(100% + var(--space-1));
  right: 0;
  min-width: 12rem;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: var(--space-1) 0;
  z-index: var(--z-dropdown);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition:
    opacity var(--transition-fast),
    visibility var(--transition-fast),
    transform var(--transition-fast);
}

.navbar__dropdown:hover .navbar__dropdown-menu,
.navbar__dropdown:focus-within .navbar__dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.navbar__dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  color: var(--color-foreground);
  font-size: var(--font-size-sm);
  text-decoration: none;
  border-radius: 0;
  transition: background var(--transition-fast);
}

.navbar__dropdown-item:hover {
  background: var(--color-muted);
}