/* ============================================
   MC Suite - Hierarchical Sidebar Styles
   Phase 8: Collapsible submenus with state persistence
   ============================================ */

/* ============================================
   SIDEBAR BODY (Scrollable Content Area)
   ============================================ */
.sidebar-body {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-sm, 0.5rem) 0;
}

/* Custom scrollbar for sidebar */
.sidebar-body::-webkit-scrollbar {
  width: 6px;
}

.sidebar-body::-webkit-scrollbar-track {
  background: transparent;
}

.sidebar-body::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.2);
  border-radius: 3px;
}

.sidebar-body::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.3);
}

/* Firefox scrollbar */
.sidebar-body {
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.2) transparent;
}

/* ============================================
   SECTION HEADERS
   ============================================ */
.sidebar-section-header {
  padding: var(--space-md, 0.75rem) var(--space-lg, 1.25rem) var(--space-xs, 0.5rem);
  font-size: var(--font-size-xs, 0.7rem);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: rgba(255, 255, 255, 0.5);
  font-weight: 600;
  margin-top: var(--space-sm, 0.5rem);
}

.sidebar-section-header:first-child {
  margin-top: 0;
}

/* ============================================
   NAVIGATION LIST
   ============================================ */
.sidebar-nav {
  padding: 0;
  margin: 0;
  list-style: none;
}

.sidebar-nav .nav-item {
  margin: 0;
}

/* ============================================
   NAVIGATION LINKS
   ============================================ */
.sidebar-nav .nav-link {
  padding: var(--space-sm, 0.6rem) var(--space-lg, 1.25rem);
  color: rgba(255, 255, 255, 0.7);
  display: flex;
  align-items: center;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  border-left: 3px solid transparent;
  text-decoration: none;
  font-size: var(--font-size-sm, 0.875rem);
}

.sidebar-nav .nav-link:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--color-text-inverse, #fff);
}

.sidebar-nav .nav-link.active {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-text-inverse, #fff);
  border-left-color: var(--color-primary, #2563EB);
}

/* Icon styling */
.sidebar-nav .nav-link i:first-child {
  width: 20px;
  margin-right: var(--space-sm, 0.75rem);
  text-align: center;
  flex-shrink: 0;
}

.sidebar-nav .nav-link span {
  flex: 1;
}

/* ============================================
   SUBMENU TOGGLE
   ============================================ */
.has-submenu {
  position: relative;
}

.submenu-toggle {
  position: relative;
  cursor: pointer;
}

.submenu-arrow {
  font-size: 0.75rem;
  transition: transform 0.2s ease;
  margin-left: auto;
}

.submenu-toggle[aria-expanded="true"] .submenu-arrow {
  transform: rotate(180deg);
}

/* ============================================
   SUBMENU
   ============================================ */
.submenu {
  padding-left: 0;
  margin: 0;
  list-style: none;
  background: rgba(0, 0, 0, 0.15);
}

.submenu .nav-link {
  padding: var(--space-xs, 0.5rem) var(--space-lg, 1.25rem);
  padding-left: calc(var(--space-lg, 1.25rem) + 28px);
  font-size: var(--font-size-sm, 0.875rem);
  border-left: 3px solid transparent;
}

.submenu .nav-link i:first-child {
  font-size: 0.85rem;
  width: 18px;
  margin-right: var(--space-xs, 0.5rem);
}

.submenu .nav-link:hover {
  background: rgba(255, 255, 255, 0.08);
}

.submenu .nav-link.active {
  background: rgba(255, 255, 255, 0.12);
  border-left-color: var(--mc-sky, #38BDF8);
}

/* ============================================
   FOCUS STATES (WCAG 2.1 AA Compliant)
   ============================================ */
.sidebar-nav .nav-link:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 var(--focus-ring-width, 2px) var(--mc-sky, #38BDF8);
  color: var(--color-text-inverse, #fff);
}

.submenu .nav-link:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 var(--focus-ring-width, 2px) var(--mc-sky, #38BDF8);
}

/* ============================================
   SIDEBAR FOOTER
   ============================================ */
.sidebar .sidebar-footer {
  padding: var(--space-md, 1rem) var(--space-lg, 1.25rem);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(0, 0, 0, 0.2);
  margin-top: auto;
}

.sidebar .sidebar-footer .text-muted {
  color: rgba(255, 255, 255, 0.6) !important;
}

/* ============================================
   DARK MODE ADJUSTMENTS
   ============================================ */
[data-bs-theme="dark"] .sidebar-body::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
}

[data-bs-theme="dark"] .sidebar-body::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.25);
}

[data-bs-theme="dark"] .submenu {
  background: rgba(0, 0, 0, 0.25);
}

[data-bs-theme="dark"] .submenu .nav-link:hover {
  background: rgba(255, 255, 255, 0.05);
}

/* ============================================
   HIGH CONTRAST MODE
   ============================================ */
@media (prefers-contrast: high) {
  .sidebar-nav .nav-link {
    border-left-width: 4px;
  }

  .sidebar-nav .nav-link.active {
    border-left-color: currentColor;
  }

  .sidebar-nav .nav-link:focus-visible {
    outline: 3px solid currentColor;
    outline-offset: -3px;
  }
}

/* ============================================
   REDUCED MOTION
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  .sidebar-nav .nav-link,
  .submenu-arrow,
  .submenu {
    transition: none;
  }

  .submenu.collapsing {
    transition: none;
  }
}