/* ===================================================================
   Layout Styles - 布局样式
   =================================================================== */

/* === 全局基础样式 === */
body {
  font-family: var(--font-family-base);
  margin: 0;
  background: var(--color-bg-secondary);
  overflow: hidden;
  color: var(--color-text-primary);
  line-height: var(--line-height-normal);
}

/* === 应用主容器 === */
#app {
  display: grid !important;
  grid-template-areas: 
    "header header header"
    "sidebar main settings"
    "banner banner banner" !important;
  grid-template-columns: 130px 1fr 320px !important;
  grid-template-rows: 60px 1fr 50px !important;
  height: 100vh !important;
  overflow: hidden !important;
  transition: grid-template-columns var(--transition-base);
}

/* 隐藏设置面板时的布局 */
#app.settings-panel-hidden {
  grid-template-columns: 130px 1fr 0px !important;
}

/* === 顶部用户区域 === */
.header {
  grid-area: header; 
}

#sidebar { 
  grid-area: sidebar; 
}

#main-content { 
  grid-area: main; 
}

#settings-panel { 
  grid-area: settings; 
}

.banner { 
  grid-area: banner; 
}

/* === 顶部用户区域 === */
.header {
  background: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-border-primary);
  display: flex;
  align-items: center;
  padding: 0 var(--spacing-4);
  z-index: 100;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
}

.user-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  overflow: hidden;
  border: 2px solid var(--color-border-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.user-avatar:hover {
  border-color: var(--color-primary);
  transform: scale(1.05);
}

.user-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 按钮图标样式 */
.btn svg {
  vertical-align: middle;
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-base);
}

.btn-icon:hover {
  background: var(--color-gray-100);
}

/* === 左侧导航栏 === */
#sidebar {
  background: #4A90E2;
  border-right: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  padding: var(--spacing-4) 0;
}

.sidebar-header {
  text-align: center;
  padding: 0 var(--spacing-4);
  margin-bottom: var(--spacing-6);
}

.sidebar-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin: 0;
  color: white;
}

.sidebar-nav {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
  padding: 0;
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-3);
  cursor: pointer;
  transition: all var(--transition-fast);
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  border-radius: var(--radius-base);
  margin: 0 var(--spacing-2);
  min-height: 64px;
}

.nav-item:hover {
  background: rgba(255, 255, 255, 0.1);
  color: white;
}

.nav-item.active {
  background: rgba(255, 255, 255, 0.2);
  color: white;
}

.nav-icon {
  width: 24px;
  height: 24px;
  margin-bottom: var(--spacing-1);
  flex-shrink: 0;
  stroke: currentColor;
}

.nav-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  text-align: center;
}

.nav-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 18px;
  height: 18px;
  padding: 0 var(--spacing-1);
  margin-left: auto;
  background: var(--color-error);
  color: var(--color-text-inverse);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-full);
  line-height: 1;
}

/* 导航栏折叠状态 */
#sidebar.collapsed {
  width: var(--sidebar-collapsed-width);
}

#sidebar.collapsed .sidebar-title,
#sidebar.collapsed .nav-label {
  display: none;
}

#sidebar.collapsed .nav-item {
  justify-content: center;
  padding: var(--spacing-3) var(--spacing-2);
}

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

/* === 主内容区域 === */
#main-content {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--color-bg-secondary);
  position: relative; /* 让按钮可以相对于main-content定位 */
}

/* 视图容器 */
.view-container {
  flex: 1;
  display: flex;
  overflow: hidden;
}

/* 简单工具栏（文档预览视图）*/
.simple-toolbar {
  background: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-border-primary);
  padding: var(--spacing-3) var(--spacing-4);
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 52px;
  flex-shrink: 0;
}

.toolbar-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  flex: 1;
  min-width: 0;
}

.file-icon {
  width: 20px;
  height: 20px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.file-name {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* 文档内容区域 */
.document-content {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  background: var(--color-bg-secondary);
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: var(--spacing-6);
}

.document-preview {
  width: 100%;
  max-width: 800px;
  background: var(--color-bg-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.page-label {
  background: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-border-primary);
  padding: var(--spacing-3) var(--spacing-4);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  text-align: center;
}

.document-canvas {
  min-height: 600px;
  background: var(--color-gray-50);
  display: block; /* 改为block，让内容正常流动 */
  position: relative;
  padding: var(--spacing-4);
  overflow-y: auto; /* 允许垂直滚动 */
}

/* 加载提示只在空状态时显示 */
.document-canvas:empty {
  display: flex;
  align-items: center;
  justify-content: center;
}

.document-canvas:empty::before {
  content: "PDF预览加载中...";
  color: var(--color-text-tertiary);
  font-size: var(--font-size-sm);
}

/* 工具栏 */
.toolbar {
  background: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-border-primary);
  padding: var(--spacing-3) var(--spacing-4);
  display: flex;
  gap: var(--spacing-2);
  align-items: center;
  flex-wrap: wrap;
  min-height: 52px;
}

/* 内容滚动区域 */
.content-scroll {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: var(--spacing-10) var(--spacing-5);
}

.content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-10);
  max-width: 100%;
}

/* === 右侧配置面板 === */
#settings-panel {
  background: var(--color-bg-primary);
  border-left: 1px solid var(--color-border-primary);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overflow-x: hidden;
}

.settings-header {
  padding: var(--spacing-5) var(--spacing-4);
  border-bottom: 1px solid var(--color-border-primary);
  background: var(--color-bg-primary);
  position: sticky;
  top: 0;
  z-index: 10;
}

.settings-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin: 0;
  color: var(--color-text-primary);
}

.settings-body {
  padding: var(--spacing-5) var(--spacing-4);
  flex: 1;
}

/* === 页面行样式（双栏对比视图）=== */
.page-row {
  display: grid;
  grid-template-columns: 1fr 4px 1fr;
  background: var(--color-bg-primary);
  box-shadow: var(--shadow-sm);
  padding: var(--spacing-5);
  border-radius: var(--radius-md);
  position: relative;
  gap: 0;
  min-height: 400px;
}

.page-row::before {
  content: "第 " attr(data-page) " 页";
  position: absolute;
  top: calc(-1 * var(--spacing-6));
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-gray-600);
  color: var(--color-text-inverse);
  padding: var(--spacing-1) var(--spacing-3);
  border-radius: var(--radius-base);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  white-space: nowrap;
  z-index: 1;
}

.pane {
  position: relative;
  overflow: hidden;
  background: var(--color-bg-primary);
  display: flex;
  justify-content: center;
  align-items: flex-start;
  min-height: 300px;
}

.pane.hidden {
  display: none;
}

.left-pane::before {
  content: "原文";
  position: absolute;
  top: var(--spacing-2);
  left: var(--spacing-2);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  padding: var(--spacing-1) var(--spacing-2);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  z-index: 5;
  opacity: 0.8;
}

.right-pane::before {
  content: "译文";
  position: absolute;
  top: var(--spacing-2);
  left: var(--spacing-2);
  background: var(--color-success);
  color: var(--color-text-inverse);
  padding: var(--spacing-1) var(--spacing-2);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  z-index: 5;
  opacity: 0.8;
}

.divider {
  background: var(--color-border-secondary);
  width: 4px;
  flex-shrink: 0;
  position: relative;
}

.divider.hidden {
  display: none;
}

.stage {
  position: relative;
  transform-origin: 0 0;
  margin: 0 auto;
  transition: transform var(--transition-base);
  will-change: transform;
}

.page-img {
  display: block;
  max-width: 100%;
  height: auto;
  box-shadow: var(--shadow-xs);
  border-radius: var(--radius-sm);
}

.overlay {
  position: absolute;
  left: 0;
  top: 0;
  pointer-events: none;
  z-index: 2;
}

.rect {
  position: absolute;
  border: 1px solid rgba(239, 68, 68, 0.8);
  background: rgba(239, 68, 68, 0.25);
  pointer-events: auto;
  box-sizing: border-box;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.rect:hover {
  background: rgba(239, 68, 68, 0.35);
  border-color: rgba(239, 68, 68, 1);
  border-width: 2px;
  z-index: 10;
  box-shadow: 0 0 8px rgba(239, 68, 68, 0.5);
}

.rect:active {
  background: rgba(239, 68, 68, 0.45);
}

/* 单栏显示模式 */
.single-col {
  grid-template-columns: 1fr !important;
}

.single-col .divider {
  display: none;
}

/* 页面加载状态 */
.page-row:not([data-loaded]) .pane {
  background: var(--color-gray-50);
  position: relative;
}

.page-row:not([data-loaded]) .pane::after {
  content: "加载中...";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: var(--color-text-tertiary);
  font-size: var(--font-size-sm);
}

/* === 底部活动横幅 === */
.banner {
  background: linear-gradient(90deg, #FF6B6B 0%, #FF8E53 100%);
  color: var(--color-text-inverse);
  display: flex;
  align-items: center;
  padding: 0 var(--spacing-4);
  position: relative;
  z-index: 50;
  animation: slideInUp 0.5s ease-out;
}

@keyframes slideInUp {
  from {
    transform: translateY(100%);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes slideOutDown {
  from {
    transform: translateY(0);
    opacity: 1;
  }
  to {
    transform: translateY(100%);
    opacity: 0;
  }
}

.banner-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  gap: var(--spacing-3);
}

.banner-text {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  flex: 1;
  text-align: center;
}

.banner-close {
  background: none;
  border: none;
  color: var(--color-text-inverse);
  cursor: pointer;
  padding: var(--spacing-2);
  font-size: 20px;
  line-height: 1;
  opacity: 0.8;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-base);
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.banner-close:hover {
  opacity: 1;
  background: rgba(255, 255, 255, 0.2);
}

.banner.hidden {
  display: none;
}

/* 横幅响应式 */
@media (max-width: 767px) {
  .banner-text {
    font-size: var(--font-size-sm);
  }
  
  .banner-close {
    width: 28px;
    height: 28px;
    font-size: 18px;
  }
}

/* === 响应式布局 === */

/* 平板设备 (768px - 1023px) */
@media (max-width: 1023px) {
  #app {
    grid-template-columns: 100px 1fr 280px;
  }

  .sidebar-header {
    padding: 0 var(--spacing-2);
    margin-bottom: var(--spacing-4);
  }

  .sidebar-title {
    font-size: var(--font-size-base);
  }

  .nav-item {
    padding: var(--spacing-2);
    min-height: 56px;
  }

  .nav-icon {
    font-size: 20px;
    margin-bottom: var(--spacing-1);
  }

  .nav-label {
    font-size: var(--font-size-xs);
  }

  #settings-panel {
    width: var(--settings-panel-tablet-width);
  }

  .content-scroll {
    padding: var(--spacing-8) var(--spacing-4);
  }

  .page-row {
    padding: var(--spacing-4);
  }
}

/* 最小屏幕支持 (1280px) */
@media (max-width: 1280px) {
  #app {
    grid-template-columns: 100px 1fr 280px;
  }
}

/* 手机设备 (<768px) */
@media (max-width: 767px) {
  #app {
    grid-template-areas: 
      "header"
      "sidebar"
      "main"
      "banner";
    grid-template-columns: 1fr;
    grid-template-rows: 60px auto 1fr 50px;
  }
  
  #settings-panel {
    display: none; /* 在手机上隐藏设置面板，或通过按钮显示 */
  }

  /* 导航栏变为顶部横向布局 */
  #sidebar {
    flex-direction: row;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--color-border-primary);
    overflow-x: auto;
    overflow-y: hidden;
    padding: 0;
  }

  .sidebar-header {
    display: none;
  }

  .sidebar-nav {
    display: flex;
    flex-direction: row;
    padding: 0;
    width: 100%;
    gap: 0;
  }

  .nav-item {
    flex: 1;
    justify-content: center;
    padding: var(--spacing-3) var(--spacing-2);
    border-radius: 0;
    border-bottom: 3px solid transparent;
    min-width: 60px;
    min-height: auto;
    margin: 0;
  }

  .nav-item.active {
    border-bottom-color: var(--color-primary);
    background: var(--color-primary-light);
  }

  .nav-item:hover {
    background: var(--color-primary-light);
  }

  .nav-label {
    display: none;
  }

  .nav-icon {
    margin-bottom: 0;
  }

  /* 配置面板变为侧滑抽屉 */
  #settings-panel {
    position: fixed;
    top: 0;
    right: -100%;
    width: 100%;
    max-width: var(--settings-panel-width);
    height: 100vh;
    z-index: var(--z-modal);
    transition: right var(--transition-slow);
    box-shadow: var(--shadow-xl);
  }

  #settings-panel.show {
    right: 0;
  }

  /* 工具栏适配 */
  .toolbar {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding: var(--spacing-2) var(--spacing-3);
  }

  /* 内容区域适配 */
  .content-scroll {
    padding: var(--spacing-5) var(--spacing-3);
  }

  .content {
    gap: var(--spacing-8);
  }

  /* 页面行适配 */
  .page-row {
    padding: var(--spacing-3);
    grid-template-columns: 1fr;
  }

  .page-row .divider {
    display: none;
  }

  .page-row .pane:not(.left-pane) {
    margin-top: var(--spacing-4);
  }

  .page-row::before {
    top: calc(-1 * var(--spacing-5));
    font-size: var(--font-size-xs);
  }
}

/* 超小屏幕优化 (<480px) */
@media (max-width: 479px) {
  .toolbar {
    padding: var(--spacing-2);
    gap: var(--spacing-1);
  }

  .content-scroll {
    padding: var(--spacing-4) var(--spacing-2);
  }

  .page-row {
    padding: var(--spacing-2);
  }

  .settings-body {
    padding: var(--spacing-4) var(--spacing-3);
  }
}

/* === 打印样式 === */
@media print {
  #sidebar,
  #settings-panel,
  .toolbar {
    display: none !important;
  }

  #main-content {
    overflow: visible;
  }

  .content-scroll {
    overflow: visible;
    padding: 0;
  }

  .page-row {
    page-break-inside: avoid;
    box-shadow: none;
    border: 1px solid var(--color-border-primary);
  }
}

/* === 翻译完成视图样式 === */

/* 完整工具栏 */
.complete-toolbar {
  background: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-border-primary);
  padding: var(--spacing-3) var(--spacing-4);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-3);
  flex-wrap: wrap;
  min-height: 52px;
  flex-shrink: 0;
}

.toolbar-section {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
}

.form-control-sm {
  padding: var(--spacing-1) var(--spacing-3);
  padding-right: var(--spacing-7);
  font-size: var(--font-size-sm);
  height: 36px;
  min-width: 120px;
  max-width: 180px;
  border: 1px solid var(--color-border-secondary);
  border-radius: var(--radius-base);
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236B7280' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--spacing-2) center;
  transition: all var(--transition-fast);
  line-height: 1.5;
}

.form-control-sm:hover {
  border-color: var(--color-gray-400);
}

.form-control-sm:focus {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

/* 下拉框选项样式 */
.form-control-sm option {
  padding: var(--spacing-2) var(--spacing-3);
  font-size: var(--font-size-sm);
  line-height: 1.5;
}

/* 翻译主内容区域 */
.translation-main {
  flex: 1;
  display: flex;
  overflow: hidden;
}

/* 缩略图导航栏 */
.thumbnail-nav {
  width: 160px;
  background: var(--color-bg-primary);
  border-right: 1px solid var(--color-border-primary);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  flex-shrink: 0;
}

.thumbnail-list {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-2);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
}

.thumbnail-item {
  position: relative;
  border: 2px solid var(--color-border-secondary);
  border-radius: var(--radius-base);
  overflow: hidden;
  cursor: pointer;
  transition: all var(--transition-fast);
  background: var(--color-bg-secondary);
  height: 180px; /* 固定高度 */
  width: 100%;
}

.thumbnail-item:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.thumbnail-item.active {
  border-color: var(--color-primary);
  border-width: 3px;
  box-shadow: 0 0 0 1px var(--color-primary);
}

.thumbnail-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.thumbnail-label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(0, 0, 0, 0.7);
  color: white;
  text-align: center;
  padding: var(--spacing-1);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
}

.thumbnail-pagination {
  padding: var(--spacing-3);
  text-align: center;
  border-top: 1px solid var(--color-border-primary);
  background: var(--color-bg-primary);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  flex-shrink: 0;
}

/* 双栏容器 */
.dual-pane-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
}

/* 完整翻译按钮区域 */
.complete-translation-footer {
  position: absolute;
  bottom: var(--spacing-4);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-2);
  z-index: 10;
}

.btn-complete-translation {
  background: linear-gradient(135deg, #E3F2FD 0%, #BBDEFB 100%);
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
  padding: var(--spacing-3) var(--spacing-6);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-fast);
  position: relative;
}

.btn-complete-translation:hover:not(:disabled) {
  background: linear-gradient(135deg, #BBDEFB 0%, #90CAF9 100%);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.word-count {
  font-size: 48px;
  font-weight: var(--font-weight-bold);
  color: var(--color-text-tertiary);
  opacity: 0.3;
}

/* 响应式适配 */
@media (max-width: 1023px) {
  .thumbnail-nav {
    width: 120px;
  }
  
  .complete-toolbar {
    flex-direction: column;
    align-items: stretch;
  }
  
  .toolbar-section {
    flex-wrap: wrap;
  }
}

@media (max-width: 767px) {
  .thumbnail-nav {
    display: none;
  }
  
  .complete-translation-footer {
    position: static;
    transform: none;
    margin-top: var(--spacing-4);
  }
}

/* === 缩放滑块样式 === */
.zoom-slider-container {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  padding: var(--spacing-1);
}

.zoom-btn {
  width: 36px;
  height: 36px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--color-gray-300);
  background: var(--color-bg-primary);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
  flex-shrink: 0;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.zoom-btn svg {
  stroke: var(--color-gray-600);
  transition: stroke var(--transition-fast);
}

.zoom-btn:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
  box-shadow: 0 2px 6px rgba(73, 152, 255, 0.3);
}

.zoom-btn:hover svg {
  stroke: var(--color-primary);
}

.zoom-btn:active {
  transform: scale(0.95);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.zoom-value {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  min-width: 45px;
  text-align: center;
  flex-shrink: 0;
}

.zoom-slider {
  width: 180px;
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--color-gray-200);
  outline: none;
  -webkit-appearance: none;
  appearance: none;
  cursor: pointer;
  position: relative;
}

.zoom-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-primary);
  cursor: grab;
  transition: all var(--transition-fast);
  box-shadow: 0 2px 6px rgba(73, 152, 255, 0.4);
  border: 3px solid white;
  margin-top: -8px; /* 垂直居中对齐 */
}

.zoom-slider::-webkit-slider-thumb:hover {
  background: var(--color-primary-hover);
  transform: scale(1.15);
  box-shadow: 0 3px 8px rgba(73, 152, 255, 0.5);
}

.zoom-slider::-webkit-slider-thumb:active {
  cursor: grabbing;
  transform: scale(1.05);
}

.zoom-slider::-moz-range-thumb {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-primary);
  cursor: grab;
  border: 3px solid white;
  transition: all var(--transition-fast);
  box-shadow: 0 2px 6px rgba(73, 152, 255, 0.4);
}

.zoom-slider::-moz-range-thumb:hover {
  background: var(--color-primary-hover);
  transform: scale(1.15);
  box-shadow: 0 3px 8px rgba(73, 152, 255, 0.5);
}

.zoom-slider::-moz-range-thumb:active {
  cursor: grabbing;
  transform: scale(1.05);
}

.zoom-slider::-webkit-slider-runnable-track {
  width: 100%;
  height: 8px;
  border-radius: var(--radius-full);
  background: linear-gradient(to right, var(--color-gray-200) 0%, var(--color-gray-300) 100%);
}

.zoom-slider::-moz-range-track {
  width: 100%;
  height: 8px;
  border-radius: var(--radius-full);
  background: linear-gradient(to right, var(--color-gray-200) 0%, var(--color-gray-300) 100%);
}

/* === 缩略图导航栏样式 === */
.thumbnail-nav {
  position: relative;
  width: 160px;
  background: var(--color-bg-primary);
  border-right: 1px solid var(--color-border-primary);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: width var(--transition-base);
}

/* 缩略图导航栏隐藏状态 */
.thumbnail-nav.hidden {
  width: 0;
  min-width: 0;
  border-right: none;
  overflow: visible; /* 隐藏时允许按钮溢出 */
}

/* 隐藏内容但保留按钮 */
.thumbnail-nav.hidden .thumbnail-list,
.thumbnail-nav.hidden .thumbnail-pagination {
  display: none;
}

/* 缩略图切换按钮 - 基于translation-main定位 */
.thumbnail-toggle-btn {
  position: absolute;
  top: 50%;
  left: 160px; /* 默认在缩略图导航栏右边缘 */
  transform: translateY(-50%);
  z-index: 1000;
  width: 24px;
  height: 48px;
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border-primary);
  border-radius: 0 var(--radius-base) var(--radius-base) 0;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  box-shadow: 2px 0 4px rgba(0, 0, 0, 0.1);
}

.thumbnail-toggle-btn:hover {
  background: var(--color-gray-50);
  box-shadow: 2px 0 6px rgba(0, 0, 0, 0.15);
}

.thumbnail-toggle-btn svg {
  transition: transform var(--transition-fast);
}

/* 隐藏状态下的切换按钮 - 移到左边缘 */
.thumbnail-nav.hidden ~ .thumbnail-toggle-btn {
  left: 0; /* 移到最左边 */
  border-radius: var(--radius-base);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.thumbnail-nav.hidden ~ .thumbnail-toggle-btn:hover {
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

.thumbnail-nav.hidden ~ .thumbnail-toggle-btn svg {
  transform: rotate(180deg);
}

/* 翻译主内容区域 */
.translation-main {
  flex: 1;
  display: flex;
  overflow: hidden; /* 改回hidden，让内部处理滚动 */
  position: relative;
}

/* 双栏容器自适应 */
.dual-pane-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden; /* 保持hidden，让内部的content-scroll处理滚动 */
  position: relative;
  transition: margin-left var(--transition-base);
}

/* 内容滚动区域需要处理overflow */
.dual-pane-container .content-scroll {
  overflow-y: auto;
  overflow-x: hidden;
}

/* 缩略图隐藏时，双栏容器扩展 */
.thumbnail-nav.hidden ~ .dual-pane-container {
  margin-left: 0;
}

/* === 设置面板切换按钮样式 === */
#settings-panel {
  position: relative;
  transition: width var(--transition-base);
}

/* 设置面板切换按钮 - 基于translation-view定位 */
.settings-toggle-btn {
  position: absolute;
  top: 50%;
  right: -12px; /* 在视图右边缘外 */
  transform: translateY(-50%);
  z-index: 1000;
  width: 24px;
  height: 48px;
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-base) 0 0 var(--radius-base);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  box-shadow: -2px 0 4px rgba(0, 0, 0, 0.1);
}

.settings-toggle-btn:hover {
  background: var(--color-gray-50);
  box-shadow: -2px 0 6px rgba(0, 0, 0, 0.15);
}

.settings-toggle-btn svg {
  transition: transform var(--transition-fast);
}

/* 设置面板隐藏状态 */
#settings-panel.hidden {
  width: 0 !important;
  min-width: 0;
  border-left: none;
}

#settings-panel.hidden .settings-header,
#settings-panel.hidden .settings-body {
  display: none;
}

/* 隐藏状态下的切换按钮 - 移到右边缘 */
#app.settings-panel-hidden .settings-toggle-btn {
  right: -12px; /* 保持在右边缘 */
  border-radius: var(--radius-base);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

#app.settings-panel-hidden .settings-toggle-btn:hover {
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

#app.settings-panel-hidden .settings-toggle-btn svg {
  transform: rotate(180deg);
}

/* === 翻译完成视图布局修复 === */
#translation-view {
  display: flex;
  flex-direction: column;
  overflow: hidden; /* 防止整体滚动 */
}

#translation-view .translation-main {
  flex: 1;
  overflow: hidden; /* 防止translation-main滚动 */
}