/*
 * Sidebar
 * Collapsible, nested nav, mobile responsive
 * All styles scoped under .sidebar to avoid conflicts with site navigation
 */

.sidebar {
  width: var(--sidebar-width, 16rem);
  height: 100vh;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  transition: width var(--transition-base);
  flex-shrink: 0;
}

.sidebar.collapsed {
  width: var(--sidebar-collapsed, 4rem);
}

/* Logo area */
.sidebar .sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4);
  border-bottom: 1px solid var(--color-divider);
  min-height: 4rem;
}

.sidebar .sidebar-logo {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
}

.sidebar.collapsed .sidebar-logo {
  opacity: 0;
  width: 0;
}

.sidebar .sidebar-toggle {
  padding: var(--space-1);
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast);
}

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

/* Navigation */
.sidebar .sidebar-nav {
  flex: 1;
  padding: var(--space-2);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.sidebar .sidebar-section {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  padding: var(--space-4) var(--space-3) var(--space-2);
  white-space: nowrap;
}

.sidebar.collapsed .sidebar-section {
  opacity: 0;
}

.sidebar .sidebar-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

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

.sidebar .sidebar-link.active {
  color: var(--color-primary);
  background: rgba(99, 102, 241, 0.1);
  font-weight: 500;
}

.sidebar .sidebar-link-icon {
  width: 1.25rem;
  height: 1.25rem;
  flex-shrink: 0;
}

.sidebar.collapsed .sidebar-link span {
  display: none;
}

/* Nested nav */
.sidebar .sidebar-nested {
  padding-left: var(--space-10);
}

.sidebar.collapsed .sidebar-nested {
  display: none;
}

/* Footer */
.sidebar .sidebar-footer {
  padding: var(--space-4);
  border-top: 1px solid var(--color-divider);
}

/* Mobile overlay */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    z-index: var(--z-overlay);
    transform: translateX(-100%);
    transition: transform var(--transition-base);
  }

  .sidebar.mobile-open {
    transform: translateX(0);
  }

  .sidebar-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: calc(var(--z-overlay) - 1);
  }
}