/* ═══════════════════════════════════════════
   Nav Bar + Sidebar — TailAdmin‑style
   ═══════════════════════════════════════════ */

/* ── Bottom Navigation (mobile) ── */
.app-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  width: 100%;
  height: var(--nav-height);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-around;
  align-items: center;
  z-index: 100;
  box-sizing: border-box;
}

.nav-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm);
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  min-height: var(--touch-min);
  border: none;
  background: none;
  cursor: pointer;
  transition: color var(--transition-fast);
  font-weight: var(--font-weight-medium);
}

.nav-item:hover {
  color: var(--color-text-secondary);
}

.nav-item.active {
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
}

.nav-item .nav-icon {
  font-size: 1.25rem;
  margin-bottom: 2px;
}

/* ── Sidebar (desktop) ── */
.app-sidebar {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--color-sidebar);
  border-right: 1px solid var(--color-border);
  z-index: 90;
  padding-top: var(--header-height);
  overflow-y: auto;
  overflow-x: hidden;
  transition: width var(--transition-normal), background-color var(--transition-normal),
    border-color var(--transition-normal);
}

/* Sidebar toggle */
.sidebar-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 48px;
  border: none;
  background: none;
  cursor: pointer;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.sidebar-toggle:hover {
  background: var(--color-background);
  color: var(--color-primary);
}

.sidebar-toggle svg {
  transition: transform var(--transition-normal);
}

.app-sidebar.collapsed .sidebar-toggle svg {
  transform: rotate(180deg);
}

/* Sidebar label (MENU) */
.sidebar-heading {
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

/* Sidebar nav */
.sidebar-nav {
  display: flex;
  flex-direction: column;
  padding: var(--spacing-sm);
  gap: 2px;
}

.sidebar-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: 10px var(--spacing-md);
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-md);
  transition: background var(--transition-fast), color var(--transition-fast);
  position: relative;
  white-space: nowrap;
  overflow: hidden;
}

.sidebar-item:hover {
  background: var(--color-background);
  color: var(--color-text);
}

.sidebar-item.active {
  background: rgba(var(--color-primary-rgb), 0.08);
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
}

.sidebar-item .sidebar-icon {
  font-size: 1.125rem;
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.sidebar-item .sidebar-label {
  transition: opacity var(--transition-normal);
}

/* ── Collapsed Sidebar ── */
.app-sidebar.collapsed {
  width: var(--sidebar-collapsed-width);
}

.app-sidebar.collapsed .sidebar-nav {
  padding: var(--spacing-xs);
}

.app-sidebar.collapsed .sidebar-item {
  justify-content: center;
  padding: 12px;
  gap: 0;
}

.app-sidebar.collapsed .sidebar-label {
  opacity: 0;
  width: 0;
  overflow: hidden;
  position: absolute;
}

.app-sidebar.collapsed .sidebar-heading {
  text-align: center;
  padding: var(--spacing-sm);
  font-size: 0;
}

/* Tooltip on hover when collapsed */
.app-sidebar.collapsed .sidebar-item:hover::after {
  content: attr(title);
  position: absolute;
  left: calc(100% + 8px);
  top: 50%;
  transform: translateY(-50%);
  background: var(--color-text);
  color: var(--color-surface);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-normal);
  white-space: nowrap;
  z-index: 200;
  pointer-events: none;
  box-shadow: var(--shadow-md);
}

.app-sidebar.collapsed .sidebar-item:hover::before {
  content: '';
  position: absolute;
  left: calc(100% + 2px);
  top: 50%;
  transform: translateY(-50%);
  border: 5px solid transparent;
  border-right-color: var(--color-text);
  z-index: 200;
  pointer-events: none;
}