/* ============================================
   后台主框架布局
   ============================================ */
.layout {
  display: flex;
  min-height: 100vh;
}

/* 侧边栏 */
.sidebar {
  width: var(--side-width);
  background: var(--bg-side);
  color: rgba(255, 255, 255, 0.85);
  flex-shrink: 0;
  transition: width 0.2s;
  display: flex;
  flex-direction: column;
}

.sidebar.collapsed {
  width: var(--side-collapsed);
}

.sidebar-logo {
  height: var(--header-height);
  padding: 0 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(255, 255, 255, 0.04);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  flex-shrink: 0;
}

.sidebar-logo .logo-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}

.sidebar-logo .logo-text {
  font-size: 16px;
  font-weight: 600;
  color: #fff;
  white-space: nowrap;
  overflow: hidden;
}

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

/* 菜单 */
.sidebar-menu {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0;
}

.sidebar-menu::-webkit-scrollbar {
  width: 6px;
}

.sidebar-menu::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
}

.menu-group {
  margin-bottom: 4px;
}

.menu-group-title {
  padding: 12px 16px 6px;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.4);
  letter-spacing: 0.5px;
}

.sidebar.collapsed .menu-group-title {
  display: none;
}

.menu-item {
  display: flex;
  align-items: center;
  height: 44px;
  padding: 0 16px;
  color: rgba(255, 255, 255, 0.7);
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
  font-size: 14px;
  user-select: none;
}

.menu-item:hover {
  background: var(--bg-side-hover);
  color: #fff;
}

.menu-item.active {
  background: var(--primary);
  color: #fff;
}

.menu-item.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: #fff;
}

.menu-icon {
  font-size: 18px;
  margin-right: 12px;
  width: 20px;
  text-align: center;
  flex-shrink: 0;
}

.menu-label {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
}

.menu-arrow {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.4);
  transition: transform 0.2s;
}

.menu-arrow.expanded {
  transform: rotate(90deg);
}

.sidebar.collapsed .menu-label,
.sidebar.collapsed .menu-arrow {
  display: none;
}

.submenu {
  display: none;
  background: rgba(0, 0, 0, 0.15);
}

.submenu.expanded {
  display: block;
}

.submenu .menu-item {
  padding-left: 48px;
  height: 40px;
  font-size: 13px;
}

.sidebar.collapsed .submenu {
  display: none !important;
}

/* 主内容区 */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--bg-page);
}

/* 顶栏 */
.header {
  height: var(--header-height);
  background: #fff;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  padding: 0 20px;
  gap: 16px;
  flex-shrink: 0;
}

.header-toggle {
  cursor: pointer;
  font-size: 18px;
  color: var(--text-secondary);
  width: 32px;
  height: 32px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}

.header-toggle:hover {
  background: var(--bg-hover);
}

.breadcrumb {
  flex: 1;
  font-size: 13px;
  color: var(--text-tertiary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb-sep {
  color: var(--text-tertiary);
}

.breadcrumb-current {
  color: var(--text-primary);
  font-weight: 500;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-action {
  cursor: pointer;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: var(--text-secondary);
  position: relative;
  transition: background 0.2s;
}

.header-action:hover {
  background: var(--bg-hover);
  color: var(--primary);
}

.badge-dot {
  position: absolute;
  top: 6px;
  right: 6px;
  min-width: 16px;
  height: 16px;
  padding: 0 4px;
  background: var(--danger);
  color: #fff;
  border-radius: 8px;
  font-size: 11px;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 8px 4px 12px;
  border-radius: 16px;
  cursor: pointer;
  transition: background 0.2s;
}

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

.user-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 600;
}

.user-name {
  font-size: 13px;
  color: var(--text-primary);
  font-weight: 500;
}

/* 内容区 */
.content {
  flex: 1;
  overflow: auto;
  position: relative;
}

/* iframe 兼容 */
.content iframe {
  width: 100%;
  height: 100%;
  border: none;
}

/* 下拉菜单 */
.dropdown {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 6px;
  background: #fff;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-modal);
  min-width: 180px;
  padding: 6px 0;
  z-index: 100;
  display: none;
}

.dropdown.open .dropdown-menu {
  display: block;
}

.dropdown-item {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
}

.dropdown-item:hover {
  background: var(--bg-hover);
  color: var(--primary);
}

.dropdown-divider {
  height: 1px;
  background: var(--border-light);
  margin: 4px 0;
}