/* ============================================
   全局变量 - 严格遵循 ArcoDesign 设计规范
   ============================================ */
:root {
  /* 主色 - arcoblue */
  --primary-1: #E8F3FF;
  --primary-2: #BEDAFF;
  --primary-3: #94BFFF;
  --primary-4: #6AA1FF;
  --primary-5: #4080FF;
  --primary-6: #165DFF;
  --primary-7: #0E42D2;
  --primary-8: #072CA6;
  --primary-9: #031A79;
  --primary-10: #000D4D;

  /* 中性色 - gray */
  --gray-1: #F7F8FA;
  --gray-2: #F2F3F5;
  --gray-3: #E5E6EB;
  --gray-4: #C9CDD4;
  --gray-5: #A9AEB8;
  --gray-6: #86909C;
  --gray-7: #6B7785;
  --gray-8: #4E5969;
  --gray-9: #272E3B;
  --gray-10: #1D2129;

  /* 功能色（命名收敛到 arco-base.css） */
  --success: #00B42A;     /* alias --success-6 */
  --success-1: #E8FFEA;
  --warning: #FF7D00;     /* alias --warning-6 */
  --warning-1: #FFF7E8;
  --danger: #F53F3F;      /* alias --danger-6 */
  --danger-1: #FFECE8;
  --info: #3491FA;        /* alias --info-6 */
  --info-1: #E8F7FF;

  /* 文字（命名收敛到 arco-base.css） */
  --text-primary: #1D2129;
  --text-secondary: #4E5969;
  --text-placeholder: #86909C;
  --text-disabled: #C9CDD4;

  /* 背景（命名收敛到 arco-base.css） */
  --surface: #FFFFFF;
  --surface-raised: #F7F8FA;  /* alias --gray-1 */

  /* 阴影（命名收敛到 arco-base.css） */
  --shadow-sm: 0 2px 5px 0 rgba(0, 0, 0, 0.07);
  --shadow-md: 0 4px 10px 0 rgba(0, 0, 0, 0.10);
  --shadow-lg: 0 6px 16px 0 rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 8px 20px 0 rgba(0, 0, 0, 0.15);

  /* 圆角（命名收敛到 arco-base.css） */
  --radius-sm: 2px;
  --radius: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-circle: 50%;

  /* 间距 */
  --space-mini: 4px;
  --space-small: 8px;
  --space-medium: 16px;
  --space-large: 24px;
  --space-xlarge: 32px;

  /* 字体 */
  --font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', '微软雅黑', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Helvetica, Arial, sans-serif;

  /* 布局尺寸 */
  --sider-width: 64px;
  --header-height: 48px;
  --submenu-width: 240px;
}

/* ============================================
   重置 & 基础
   ============================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  width: 100%;
  height: 100%;
  font-family: var(--font-family);
  font-size: 14px;
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  background: var(--surface-raised);
  overflow: hidden;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input { font-family: inherit; }
ul, ol { list-style: none; }

/* ============================================
   视图切换
   ============================================ */
.view {
  width: 100%;
  height: 100vh;
  display: none;
}
.view.active {
  display: block;
  animation: fadeIn 0.3s ease-out;
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ============================================
   视图A - 登录页
   ============================================ */
.login-page {
  display: flex;
  width: 100%;
  height: 100vh;
}

/* 左侧品牌区 */
.login-brand {
  flex: 1;
  position: relative;
  background: linear-gradient(135deg, #031A79 0%, #165DFF 60%, #4080FF 100%);
  color: #fff;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 48px 64px;
  overflow: hidden;
}

.login-brand::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.08) 0%, transparent 70%);
  border-radius: 50%;
}

.login-brand::after {
  content: '';
  position: absolute;
  bottom: -100px;
  left: -100px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(106, 161, 255, 0.2) 0%, transparent 70%);
  border-radius: 50%;
}

.brand-header {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 16px;
}

.brand-logo {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, #FFFFFF 0%, #BEDAFF 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.brand-name {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.brand-content {
  position: relative;
  z-index: 2;
  max-width: 480px;
}

.brand-title {
  font-size: 36px;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 16px;
  letter-spacing: 1px;
}

.brand-title .highlight {
  background: linear-gradient(135deg, #94BFFF 0%, #FFFFFF 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.brand-desc {
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 32px;
}

.brand-features {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.brand-feature {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.85);
}

.brand-feature-dot {
  width: 6px;
  height: 6px;
  background: #94BFFF;
  border-radius: 50%;
  box-shadow: 0 0 8px rgba(148, 191, 255, 0.8);
}

.brand-footer {
  position: relative;
  z-index: 2;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.5);
  letter-spacing: 0.5px;
}

/* 装饰几何 */
.brand-decorations {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
}

.deco-circle-1 {
  position: absolute;
  top: 20%;
  right: 10%;
  width: 120px;
  height: 120px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  animation: float 6s ease-in-out infinite;
}

.deco-circle-2 {
  position: absolute;
  top: 30%;
  right: 12%;
  width: 80px;
  height: 80px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 50%;
  animation: float 8s ease-in-out infinite reverse;
}

.deco-square {
  position: absolute;
  bottom: 25%;
  right: 15%;
  width: 60px;
  height: 60px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  transform: rotate(45deg);
  animation: float 10s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0); }
  50% { transform: translateY(-20px) rotate(0); }
}
.deco-circle-2 { animation-name: float2; }
@keyframes float2 {
  0%, 100% { transform: translateY(0) rotate(0); }
  50% { transform: translateY(15px) rotate(0); }
}
.deco-square { animation-name: float3; }
@keyframes float3 {
  0%, 100% { transform: translateY(0) rotate(45deg); }
  50% { transform: translateY(-15px) rotate(45deg); }
}

/* 右侧表单区 */
.login-form-area {
  width: 520px;
  background: var(--surface);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 64px 80px;
  position: relative;
}

.login-form-header {
  margin-bottom: 32px;
}

.login-form-title {
  font-size: 24px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.login-form-subtitle {
  font-size: 14px;
  color: var(--text-secondary);
}

/* 表单 */
.login-form-pane {
  display: none;
}

.login-form-pane.active {
  display: block;
  animation: fadeIn 0.3s ease-out;
}

.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 8px;
  font-weight: 500;
}

.form-input-wrap {
  position: relative;
}

.form-input {
  width: 100%;
  height: 40px;
  padding: 0 12px 0 40px;
  font-size: 14px;
  color: var(--text-primary);
  background: var(--surface);
  border: 1px solid var(--gray-3);
  border-radius: var(--radius);
  transition: all 0.2s;
  outline: none;
}

.form-input:hover {
  border-color: var(--primary-4);
}

.form-input:focus {
  border-color: var(--primary-6);
  box-shadow: 0 0 0 2px rgba(22, 93, 255, 0.1);
}

.form-input::placeholder {
  color: var(--text-disabled);
}

.form-input-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-placeholder);
  pointer-events: none;
  display: flex;
}

.form-input-action {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  padding: 4px 8px;
  color: var(--text-placeholder);
  cursor: pointer;
  display: flex;
  border-radius: var(--radius-sm);
}

.form-input-action:hover {
  color: var(--text-primary);
  background: var(--gray-2);
}

/* 复选框 */
.form-checkbox {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  user-select: none;
  font-size: 14px;
  color: var(--text-secondary);
}

.form-checkbox-input {
  width: 16px;
  height: 16px;
  border: 1px solid var(--gray-4);
  border-radius: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  background: var(--surface);
}

.form-checkbox:hover .form-checkbox-input {
  border-color: var(--primary-5);
}

.form-checkbox.checked .form-checkbox-input {
  background: var(--primary-6);
  border-color: var(--primary-6);
}

.form-checkbox.checked .form-checkbox-input::after {
  content: '';
  width: 4px;
  height: 8px;
  border: solid #fff;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
  margin-bottom: 2px;
}

.form-row-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.form-link {
  font-size: 14px;
  color: var(--primary-6);
  cursor: pointer;
}

.form-link:hover {
  color: var(--primary-7);
}

/* 主按钮 */
.btn-primary {
  width: 100%;
  height: 40px;
  background: var(--primary-6);
  color: #fff;
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn-primary:hover {
  background: var(--primary-5);
  box-shadow: 0 4px 12px rgba(22, 93, 255, 0.3);
}

.btn-primary:active {
  background: var(--primary-7);
}

.btn-primary:disabled {
  background: var(--primary-3);
  cursor: not-allowed;
  box-shadow: none;
}

/* 钉钉快捷登录按钮（钉钉品牌色 #1677FF） */
.dingtalk-btn {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  width: 100%; height: 40px;
  margin-top: 12px;
  background: #1677FF; color: #FFFFFF;
  border: none; border-radius: var(--radius);
  font-size: 14px; font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, box-shadow 0.15s;
}
.dingtalk-btn:hover { background: #0E5FD9; box-shadow: 0 2px 8px rgba(22, 119, 255, 0.3); }
.dingtalk-btn:active { background: #0A4FB3; }
.dingtalk-btn svg { width: 18px; height: 18px; }

.login-divider {
  display: flex; align-items: center; gap: 12px;
  margin: 20px 0 4px;
  font-size: 12px; color: var(--text-placeholder);
}
.login-divider::before,
.login-divider::after {
  content: ''; flex: 1; height: 1px; background: var(--gray-3);
}

/* 登录页底部 */
.login-form-footer {
  position: absolute;
  bottom: 24px;
  left: 80px;
  right: 80px;
  text-align: center;
  font-size: 12px;
  color: var(--text-placeholder);
}

/* ============================================
   视图B - 主菜单
   ============================================ */
.main-page {
  display: flex;
  width: 100%;
  height: 100vh;
  background: var(--surface);
}

/* 左侧一级菜单（窄图标栏） */
.main-sider {
  width: var(--sider-width);
  background: var(--surface);
  border-right: 1px solid var(--gray-3);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

/* 一级菜单列表 */
.sider-menu {
  flex: 1;
  padding: 8px 0;
  overflow-y: auto;
}

.sider-menu::-webkit-scrollbar {
  width: 6px;
}
.sider-menu::-webkit-scrollbar-thumb {
  background: var(--gray-4);
  border-radius: 3px;
}
.sider-menu::-webkit-scrollbar-thumb:hover {
  background: var(--gray-5);
}

.sider-menu-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: 12px 4px;
  margin: 0 8px 4px;
  border-radius: var(--radius);
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 12px;
  transition: all 0.15s;
  user-select: none;
  text-align: center;
  line-height: 1.2;
}

.sider-menu-item:hover {
  background: var(--gray-2);
  color: var(--text-primary);
}

.sider-menu-item.active {
  background: var(--primary-1);
  color: var(--primary-6);
  font-weight: 600;
}

.sider-menu-item.active .sider-menu-icon {
  color: var(--primary-6);
}

.sider-menu-icon {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-placeholder);
  flex-shrink: 0;
}

.sider-menu-item:hover .sider-menu-icon {
  color: var(--text-primary);
}

.sider-menu-text {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

/* 右侧主区 */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

/* ============================================
   顶部栏 - logo / 多标签页 / 用户操作 三列布局
   ============================================ */
.main-header {
  height: var(--header-height);
  background: var(--surface);
  border-bottom: 1px solid var(--gray-3);
  display: flex;
  align-items: stretch;
  flex-shrink: 0;
  position: relative;
}

/* 左侧 - 品牌 Logo + 平台名 */
.header-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 16px;
  flex-shrink: 0;
  border-right: 1px solid var(--gray-3);
}

.header-brand-icon {
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, var(--primary-6) 0%, var(--primary-8) 100%);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 600;
  font-size: 12px;
  box-shadow: 0 2px 6px rgba(22, 93, 255, 0.3);
  flex-shrink: 0;
}

.header-brand-text {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
}

/* 中部 - 多标签页 */
.tab-bar-wrap {
  flex: 1;
  display: flex;
  align-items: stretch;
  min-width: 0;
  position: relative;
}

.tab-bar {
  flex: 1;
  display: flex;
  align-items: stretch;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  -ms-overflow-style: none;
  min-width: 0;
}

.tab-bar::-webkit-scrollbar {
  display: none;
}

.tab-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 12px;
  height: 100%;
  min-width: 100px;
  max-width: 200px;
  border-right: 1px solid var(--gray-3);
  cursor: pointer;
  font-size: 13px;
  color: var(--text-secondary);
  background: var(--surface);
  position: relative;
  user-select: none;
  flex-shrink: 0;
  transition: color 0.15s, background 0.15s;
}

.tab-item:hover {
  color: var(--text-primary);
  background: var(--gray-1);
}

.tab-item.active {
  color: var(--primary-6);
  background: var(--primary-1);
  font-weight: 500;
}

.tab-item.active::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--primary-6);
}

.tab-title {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}

.tab-close {
  width: 18px;
  height: 18px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-placeholder);
  flex-shrink: 0;
  font-size: 14px;
  line-height: 1;
  transition: all 0.15s;
}

.tab-close:hover {
  background: rgba(0, 0, 0, 0.1);
  color: var(--text-primary);
}

.tab-item.active .tab-close {
  color: var(--primary-7);
}

.tab-item.active .tab-close:hover {
  background: var(--primary-2);
  color: var(--primary-7);
}

/* 标签溢出 - 右侧 ▾ 按钮 */
.tab-overflow-wrap {
  display: flex;
  align-items: center;
  padding: 0 4px;
  border-left: 1px solid var(--gray-3);
  flex-shrink: 0;
  position: relative;
}

.tab-overflow-btn {
  width: 28px;
  height: 28px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all 0.15s;
}

.tab-overflow-btn:hover {
  background: var(--gray-2);
  color: var(--text-primary);
}

.tab-overflow-dropdown {
  position: absolute;
  top: calc(100% - 4px);
  right: 0;
  min-width: 200px;
  max-width: 320px;
  max-height: 360px;
  overflow-y: auto;
  background: var(--surface);
  border: 1px solid var(--gray-3);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 4px 0;
  z-index: 100;
  display: none;
}

.tab-overflow-dropdown.show {
  display: block;
}

.tab-overflow-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: background 0.15s;
}

.tab-overflow-item:hover {
  background: var(--gray-2);
  color: var(--text-primary);
}

.tab-overflow-item.active {
  color: var(--primary-6);
  background: var(--primary-1);
  font-weight: 500;
}

.tab-overflow-item-text {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}

.tab-overflow-item-close {
  width: 16px;
  height: 16px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-placeholder);
  font-size: 12px;
  line-height: 1;
  flex-shrink: 0;
  transition: all 0.15s;
}

.tab-overflow-item-close:hover {
  background: rgba(0, 0, 0, 0.1);
  color: var(--text-primary);
}

/* 右侧 - 用户操作 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 16px;
  border-left: 1px solid var(--gray-3);
  flex-shrink: 0;
}

.header-icon-btn {
  width: 32px;
  height: 32px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all 0.15s;
  background: none;
  border: none;
}

.header-icon-btn:hover {
  background: var(--gray-2);
  color: var(--text-primary);
}

.user-info {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 8px 4px 4px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.15s;
}

.user-info:hover {
  background: var(--gray-2);
}

.user-avatar {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-circle);
  background: linear-gradient(135deg, var(--primary-4) 0%, var(--primary-7) 100%);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 600;
}

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

/* ============================================
   主体 - 二级/三级菜单 + 内容区
   ============================================ */
.main-body {
  flex: 1;
  display: flex;
  overflow: hidden;
  min-height: 0;
  position: relative;
}

.submenu-panel {
  width: var(--submenu-width);
  background: var(--surface-raised);
  border-right: 1px solid var(--gray-3);
  padding: 20px 12px;
  overflow-y: auto;
  flex-shrink: 0;
  transition: width 0.2s ease, padding 0.2s ease, border-color 0.2s ease;
}

.left-menu-toggle {
  position: absolute;
  left: calc(var(--submenu-width) - 12px);
  top: 16px;
  z-index: 10;
  width: 24px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--gray-3);
  border-radius: 12px;
  background: var(--surface);
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
  transition: left 0.2s ease, color 0.15s, border-color 0.15s, background 0.15s;
}

.left-menu-toggle:hover {
  color: var(--primary-6);
  border-color: var(--primary-3);
  background: var(--primary-1);
}

.left-menu-toggle .expand-icon { display: none; }

.main-page.left-menu-collapsed .submenu-panel {
  width: 0;
  min-width: 0;
  padding-left: 0;
  padding-right: 0;
  border-right-color: transparent;
  overflow: hidden;
}

.main-page.left-menu-collapsed .left-menu-toggle {
  left: 8px;
}

.main-page.left-menu-collapsed .left-menu-toggle .collapse-icon { display: none; }
.main-page.left-menu-collapsed .left-menu-toggle .expand-icon { display: block; }
.main-page.left-menu-collapsed .submenu-panel > * { opacity: 0; pointer-events: none; }
.submenu-panel > * { transition: opacity 0.15s ease; }
}

.submenu-panel::-webkit-scrollbar {
  width: 6px;
}
.submenu-panel::-webkit-scrollbar-thumb {
  background: var(--gray-4);
  border-radius: 3px;
}

.submenu-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  padding: 0 12px 16px;
  border-bottom: 1px solid var(--gray-3);
  margin-bottom: 12px;
}

.submenu-group {
  margin-bottom: 8px;
}

.submenu-group-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-radius: var(--radius);
  cursor: pointer;
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 500;
  user-select: none;
  transition: all 0.15s;
}

.submenu-group-header:hover {
  background: var(--gray-2);
}

.submenu-group-header.collapsible {
  color: var(--text-primary);
}

.submenu-group-header.collapsible.collapsed {
  font-weight: 500;
  color: var(--text-secondary);
}

.submenu-group-arrow {
  width: 16px;
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-placeholder);
  transition: transform 0.2s;
}

.submenu-group-header.collapsed .submenu-group-arrow {
  transform: rotate(-90deg);
}

.submenu-list {
  padding: 4px 0 4px 12px;
  overflow: hidden;
  transition: max-height 0.3s ease, opacity 0.2s;
  max-height: 500px;
  opacity: 1;
}

.submenu-list.collapsed {
  max-height: 0;
  opacity: 0;
  padding: 0 0 0 12px;
}

.submenu-branch {
  margin: 2px 0;
}

.submenu-branch-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px 8px 24px;
  border-radius: var(--radius);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  position: relative;
  transition: all 0.15s;
  user-select: none;
}

.submenu-branch-header::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 4px;
  background: var(--text-disabled);
  border-radius: 50%;
  transition: all 0.15s;
}

.submenu-branch-header:hover,
.submenu-branch-header.active {
  color: var(--primary-6);
  background: var(--primary-1);
}

.submenu-branch-header:hover::before,
.submenu-branch-header.active::before {
  background: var(--primary-6);
}

.submenu-branch-header.collapsed .submenu-group-arrow {
  transform: rotate(-90deg);
}

.submenu-branch-list {
  padding: 2px 0 4px 16px;
  overflow: hidden;
  transition: max-height 0.3s ease, opacity 0.2s;
  max-height: 220px;
  opacity: 1;
}

.submenu-branch-list.collapsed {
  max-height: 0;
  opacity: 0;
  padding-top: 0;
  padding-bottom: 0;
}

.submenu-item {
  display: block;
  padding: 8px 12px 8px 24px;
  font-size: 14px;
  color: var(--text-secondary);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.15s;
  user-select: none;
  position: relative;
}

.submenu-item::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 4px;
  background: var(--text-disabled);
  border-radius: 50%;
  transition: all 0.15s;
}

.submenu-item:hover {
  color: var(--primary-6);
  background: var(--primary-1);
}

.submenu-item:hover::before {
  background: var(--primary-6);
}

.submenu-item.active {
  color: var(--primary-6);
  font-weight: 600;
  background: var(--primary-1);
}

.submenu-item.active::before {
  background: var(--primary-6);
  box-shadow: 0 0 0 3px rgba(22, 93, 255, 0.15);
}

.submenu-item.submenu-child {
  padding-left: 28px;
}

.submenu-item.submenu-child::before {
  left: 14px;
}

/* 内容区 */
.content-area {
  flex: 1;
  background: var(--surface);
  overflow: hidden;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.content-empty {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-placeholder);
  padding: 24px;
}

.content-empty-icon {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-circle);
  background: var(--gray-2);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  color: var(--text-disabled);
}

.content-empty-title {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 8px;
  font-weight: 500;
}

.content-empty-desc {
  font-size: 13px;
  color: var(--text-placeholder);
}

/* 内容区-有数据时 */
.content-page {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
  width: 100%;
}

.content-page-header {
  margin-bottom: 24px;
}

.content-page-hero {
  font-size: 28px;
  font-weight: 700;
  color: var(--primary-6);
  margin: 0 0 12px 0;
  line-height: 1.3;
}

.content-page-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.content-page-desc {
  font-size: 13px;
  color: var(--text-placeholder);
}

.content-card {
  background: var(--surface);
  border: 1px solid var(--gray-3);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 16px;
}

.content-card-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.content-card-title::before {
  content: '';
  width: 3px;
  height: 14px;
  background: var(--primary-6);
  border-radius: 2px;
}

.placeholder-block {
  background: var(--surface-raised);
  border: 1px dashed var(--gray-4);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  color: var(--text-placeholder);
  font-size: 13px;
}