.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-sm) 0;
}

.nav-section {
  margin-bottom: var(--spacing-xs);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  border-radius: 0;
  font-size: var(--font-size-md);
  text-decoration: none;
  position: relative;
}

.nav-item:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  text-decoration: none;
}

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

.nav-item-icon {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
}

.sidebar.collapsed .nav-item-text {
  display: none;
}

.sidebar.collapsed .sidebar-brand-text {
  display: none;
}

.sidebar.collapsed .user-name,
.sidebar.collapsed .user-role {
  display: none;
}

.sidebar.collapsed .nav-expand-icon {
  display: none;
}

.sidebar.collapsed .nav-item {
  justify-content: center;
  padding: var(--spacing-sm) 0;
}

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

/* 折叠侧栏：默认隐藏子菜单（但允许 expanded 状态以浮动面板形式显示） */
.sidebar.collapsed .nav-section:not(.expanded) .nav-submenu {
  display: none !important;
}

/* 折叠侧栏：expanded 状态下子菜单作为浮动面板显示在侧栏右侧 */
.sidebar.collapsed .nav-section.expanded > .nav-submenu {
  display: block !important;
  position: fixed;
  left: var(--sidebar-collapsed-width, 64px);
  min-width: 180px;
  background: var(--bg-primary, #fff);
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
  border: 1px solid var(--border-primary, #e8e8e8);
  padding: 6px 0;
  z-index: 1001;
  max-height: 70vh;
  overflow-y: auto;
  max-height: 500px;
}

/* 折叠侧栏：浮动子菜单项样式（左对齐显示图标+文字） */
.sidebar.collapsed .nav-section.expanded > .nav-submenu .nav-item {
  justify-content: flex-start !important;
  padding: 8px 16px !important;
  gap: 10px;
}

.sidebar.collapsed .nav-section.expanded > .nav-submenu .nav-item-text {
  display: inline !important;
}

/* 折叠侧栏：浮动子菜单小箭头指示器 */
.sidebar.collapsed .nav-section.expanded > .nav-submenu::before {
  content: '';
  position: absolute;
  left: -6px;
  top: 16px;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 6px 6px 6px 0;
  border-color: transparent var(--bg-primary, #fff) transparent transparent;
}

/* ====== 折叠侧栏：鼠标悬浮主菜单图标显示中文名字气泡 ====== */
.sidebar.collapsed .nav-item[data-name] {
  position: relative;
}

.sidebar.collapsed .nav-item[data-name]::after {
  content: attr(data-name);
  position: absolute;
  left: 100%;
  top: 50%;
  transform: translateY(-50%);
  display: none;
  background: rgba(0,0,0,0.85);
  color: #fff;
  padding: 5px 12px;
  border-radius: 6px;
  font-size: 12px;
  white-space: nowrap;
  z-index: 1002;
  pointer-events: none;
  margin-left: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.sidebar.collapsed .nav-item[data-name]:hover::after {
  display: block;
}

/* 折叠侧栏：子菜单项不显示悬浮气泡（避免与父级冲突） */
.sidebar.collapsed .nav-submenu .nav-item[data-name]::after {
  display: none !important;
}

.sidebar.collapsed .site-footer-info {
  display: none;
}

.nav-expand-icon {
  margin-left: auto;
  display: flex;
  align-items: center;
  transition: transform var(--transition-fast);
}

.nav-section.expanded .nav-expand-icon {
  transform: rotate(180deg);
}

.nav-submenu {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal);
}

.nav-section.expanded .nav-submenu {
  max-height: 500px;
}

.nav-subitem {
  padding-left: calc(var(--spacing-lg) + 28px) !important;
  font-size: var(--font-size-sm);
}

.sidebar-footer {
  padding: var(--spacing-md);
  border-top: 1px solid var(--border-primary);
}

.user-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.user-info:hover {
  background-color: var(--bg-tertiary);
}

.user-name {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
}

.user-role {
  font-size: var(--font-size-xs);
  color: var(--text-tertiary);
}

.user-role-icon {
  font-size: 14px;
  line-height: 1;
}

.user-meta {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.sidebar.collapsed .user-meta {
  display: none;
}

.sidebar.collapsed .user-info-wrapper {
  padding: 8px 0;
  display: flex;
  justify-content: center;
}

.sidebar.collapsed .user-info {
  justify-content: center;
  padding: 4px;
}

.sidebar.collapsed .user-role-icon {
  display: none;
}

.sidebar.collapsed .user-bubble {
  display: none !important;
}