teach_sys_Demo/src/components/Layout/index.css

/* 全局z-index层级系统 - 确保弹窗层级的最佳实践 */
:root {
  /* z-index层级标准 - 数值间隔1000确保充足的层级空间 */
  --z-modal: 10000; /* 模态框 - 最高层级，包括系统消息弹窗 */
  --z-popup: 9000; /* 弹出框 - 次高层级，如用户菜单、下拉框 */
  --z-tooltip: 8000; /* 提示框 - 中等层级，如悬浮提示 */
  --z-dropdown: 7000; /* 下拉菜单 - 较低层级 */
  --z-header: 1000; /* 页头导航 - 基础层级 */
  --z-content: 1; /* 页面内容 - 默认层级 */
}

/* Layout组件专用变量定义 - 不与其他文件共享 */
.app-layout,
.sidebar,
.app-layout *,
.sidebar * {
  --primary-color: #3b82f6;
  --text-primary: #111827;
  --text-secondary: #6b7280;
  --card-bg: #ffffff;
  --sidebar-bg: #ffffff;
  --border-color: #e5e7eb;
}

/* 布局相关样式 */
.app-layout {
  display: flex;
  min-height: 100vh;
  width: 100vw;
}

/* 侧边栏样式 */
.sidebar {
  width: 280px; /* 增加宽度避免内容换行 */
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  position: fixed; /* 固定定位同时作为子元素的定位上下文 */
  height: 100%;
  overflow: hidden;
  transition: width 0.3s ease;
}

/* 侧边栏滚动条样式 - 极简清透设计 */
.sidebar::-webkit-scrollbar {
  width: 6px; /* 纤细的滚动条 */
}

.sidebar::-webkit-scrollbar-track {
  background: transparent; /* 透明轨道 */
  margin: 10px 0; /* 上下留边 */
}

.sidebar::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.1); /* 半透明滑块 */
  border-radius: 3px;
  transition: background 0.2s ease;
}

.sidebar::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 0, 0, 0.2); /* 悬停时加深 */
}

/* Firefox滚动条样式 */
.sidebar {
  scrollbar-width: thin;
  scrollbar-color: rgba(0, 0, 0, 0.1) transparent;
}

/* 折叠状态的侧边栏 */
.sidebar.collapsed {
  width: 64px;
}

.sidebar-header {
  padding: 20px 16px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 12px;
}

.sidebar-logo {
  width: 32px;
  height: 32px;
  background: var(--primary-color);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
}

.sidebar-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
}

.user-profile {
  padding: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--border-color);
}

.user-avatar {
  width: 40px;
  height: 40px;
  min-width: 40px;
  min-height: 40px;
  border-radius: 50% !important;
  background: #e5e7eb;
  background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M20 21v-2a4 4 0 0 0-4-4H8a4 4 0 0 0-4 4v2"/><circle cx="12" cy="7" r="4"/></svg>');
  background-size: 20px;
  background-repeat: no-repeat;
  background-position: center;
  flex-shrink: 0;
  flex-grow: 0;
}

.user-info h4 {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
}

/* 导航菜单样式 */
.nav-menu {
  flex: 1;
  padding: 8px 0;
  overflow-y: auto;
}

.nav-section {
  margin-bottom: 8px;
}

.nav-section-title {
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.nav-item {
  display: block;
  padding: 8px 16px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  transition: all 0.15s ease;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  cursor: pointer;
}

.nav-item:hover {
  background: #f3f4f6;
  color: var(--text-primary);
}

.nav-item.active {
  background: #eff6ff;
  color: var(--primary-color);
  font-weight: 500;
}

/* 折叠状态下的区块标题 */
.nav-section-title-collapsed {
  padding: 8px 16px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  text-align: center;
  border-bottom: 1px solid #f3f4f6;
  margin-bottom: 4px;
}

/* 悬浮的折叠/展开按钮 */
.sidebar-float-toggle {
  position: fixed;
  top: 5%; /* 垂直居中 */
  left: 260px; /* 默认位置：侧边栏宽度 */
  transform: translateY(-50%);
  width: 20px;
  height: 50px;
  background: linear-gradient(135deg, #3b82f6, #2563eb);
  border: none;
  border-radius: 0 10px 10px 0; /* 右侧圆角 */
  color: white;
  cursor: pointer;
  font-size: 10px;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 2px 0 10px rgba(59, 130, 246, 0.3);
  z-index: 1001; /* 确保在侧边栏上方 */
  opacity: 0.9;
  backdrop-filter: blur(4px);
}

/* 折叠状态的按钮位置 */
.sidebar-float-toggle.collapsed {
  left: 64px; /* 折叠时的侧边栏宽度 */
}

/* 悬停效果 */
.sidebar-float-toggle:hover {
  opacity: 1;
  width: 28px;
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  box-shadow: 3px 0 15px rgba(59, 130, 246, 0.4);
  transform: translateY(-50%) translateX(2px);
}

/* 图标动画 */
.toggle-icon {
  transition: transform 0.3s ease;
  display: inline-block;
}

.sidebar-float-toggle:hover .toggle-icon {
  transform: scale(1.2);
}

/* 旧的toggle-btn样式已被sidebar-float-toggle替代 */

/* 折叠状态下的特殊样式 */
.sidebar.collapsed .nav-item {
  padding: 8px 12px;
  text-align: center;
  font-size: 16px;
  min-height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.sidebar.collapsed .user-profile {
  justify-content: center;
  padding: 16px 12px;
}

.sidebar.collapsed .sidebar-header {
  justify-content: center;
  padding: 20px 12px;
}

/* 主内容区域 */
.main-content {
  flex: 1;
  margin-left: 280px; /* 配合侧边栏宽度调整 */
  overflow: hidden;
  transition: margin-left 0.3s ease;
  display: flex;
  flex-direction: column;
  background-color: #f2f3f5;
}

/* 当侧边栏折叠时的主内容区域 */
.main-content.sidebar-collapsed {
  margin-left: 64px;
}

/* 用户信息区域优化 */
.user-info {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

/* 消息图标容器 */
.message-icon-container {
  position: relative;
  cursor: pointer;
  padding: 4px;
  border-radius: 6px;
  transition: background-color 150ms ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.message-icon-container:hover {
  background-color: #f3f4f6;
}

/* 消息图标 */
.message-icon {
  font-size: 18px;
  color: #6b7280;
  transition: color 150ms ease;
}

.message-icon-container:hover .message-icon {
  color: #374151;
}

/* 未读消息徽章 */
.message-badge {
  position: absolute;
  top: -2px;
  right: -2px;
  background: #ef4444;
  color: white;
  border-radius: 50%;
  min-width: 16px;
  height: 16px;
  font-size: 10px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: messagePulse 2s ease-in-out infinite;
}

/* 未读徽章动画 */
@keyframes messagePulse {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.1);
  }
}

/* 消息通知浮窗遮罩 - 已由Portal替代，保留样式以防回退 */
.message-notification-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: var(--z-modal);
  pointer-events: none;
}

/* 消息通知浮窗 - 使用全局z-index系统 */
.message-notification-popup {
  position: fixed; /* Portal渲染到body，使用fixed定位 */
  top: 120px;
  left: 280px;
  width: 320px;
  max-height: 400px;
  background: #ffffff;
  border-radius: 8px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15), 0 4px 6px rgba(0, 0, 0, 0.1);
  border: 1px solid #e5e7eb;
  pointer-events: auto;
  opacity: 1;
  transform: translateY(0);
  z-index: var(--z-modal); /* 使用全局变量确保最高层级 */
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* 浮窗淡入动画 */
@keyframes notificationFadeIn {
  from {
    opacity: 0;
    transform: translateY(-8px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* 浮窗头部 */
.message-notification-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 16px 12px 16px;
  border-bottom: 1px solid #f3f4f6;
}

.message-notification-title {
  margin: 0;
  font-size: 14px;
  font-weight: 600;
  color: #111827;
}

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

.mark-all-read-btn {
  font-size: 12px;
  color: #3b82f6;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
  transition: background-color 150ms ease;
}

.mark-all-read-btn:hover {
  background-color: #eff6ff;
}

.close-btn {
  font-size: 18px;
  color: #9ca3af;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  transition: all 150ms ease;
  line-height: 1;
}

.close-btn:hover {
  background-color: #f3f4f6;
  color: #6b7280;
}

/* 浮窗内容区域 */
.message-notification-content {
  flex: 1;
  max-height: 300px;
  overflow-y: auto;
  padding: 8px 0;
  background: #ffffff;
}

/* 滚动条样式 */
.message-notification-content::-webkit-scrollbar {
  width: 4px;
}

.message-notification-content::-webkit-scrollbar-track {
  background: transparent;
}

.message-notification-content::-webkit-scrollbar-thumb {
  background-color: #e5e7eb;
  border-radius: 2px;
}

.message-notification-content::-webkit-scrollbar-thumb:hover {
  background-color: #d1d5db;
}

/* 消息列表 */
.message-list {
  display: flex;
  flex-direction: column;
}

/* 消息项 */
.message-item {
  display: flex;
  gap: 12px;
  padding: 12px 16px;
  cursor: pointer;
  transition: background-color 150ms ease;
  border-left: 2px solid transparent;
}

.message-item:hover {
  background-color: #f9fafb;
}

.message-item.unread {
  background-color: #fefefe;
  border-left-color: #3b82f6;
}

.message-item.read {
  opacity: 0.8;
}

/* 消息图标包装器 */
.message-icon-wrapper {
  position: relative;
  flex-shrink: 0;
}

.message-type-icon {
  font-size: 16px;
  display: block;
}

.message-priority-dot {
  position: absolute;
  top: -2px;
  right: -2px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
}

/* 消息内容 */
.message-content {
  flex: 1;
  min-width: 0;
}

.message-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 8px;
  margin-bottom: 4px;
}

.message-title {
  margin: 0;
  font-size: 13px;
  font-weight: 500;
  color: #111827;
  line-height: 1.3;
}

.message-time {
  font-size: 11px;
  color: #9ca3af;
  flex-shrink: 0;
}

.message-text {
  margin: 0;
  font-size: 12px;
  color: #6b7280;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 空消息状态 */
.empty-messages {
  text-align: center;
  padding: 32px 16px;
  color: #9ca3af;
}

.empty-icon {
  font-size: 32px;
  margin-bottom: 8px;
}

.empty-messages p {
  margin: 0;
  font-size: 13px;
}

/* 浮窗底部 */
.message-notification-footer {
  padding: 12px 16px;
  border-top: 1px solid #f3f4f6;
  text-align: center;
  background: #fafafa;
  border-bottom-left-radius: 8px;
  border-bottom-right-radius: 8px;
  flex-shrink: 0;
}

.message-count {
  font-size: 11px;
  color: #9ca3af;
  font-weight: 500;
}