/**
 * File Preview Component - Shadcn/UI Style
 * 文件预览面板样式
 * 
 * @created 2026-01-15
 * @updated 2026-01-16 - 添加分栏布局和 HTML 预览支持
 */

/* ===== 分栏容器 ===== */
.files-split-container {
  display: flex;
  flex-direction: row-reverse; /* 交换左右位置：预览区在左，文件列表在右 */
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

/* 文件列表面板（交换后在右侧，作为侧边栏）- VS Code 紧凑风格 */
.files-list-pane {
  flex: 0 0 240px;
  min-width: 180px;
  max-width: 50%;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--border); /* 交换后改为左边框 */
  transition: flex var(--transition-normal, 200ms) ease-out;
}

/* 文件预览面板（右侧）- 始终显示 */
.file-preview-pane {
  flex: 1;
  min-width: 300px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  position: relative;
  background: #000;
}

/* ===== Three.js 动态背景容器 ===== */
.preview-threejs-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 0;
  background: #000;
  overflow: hidden;
}

.preview-threejs-bg canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}

/* 文件预览容器覆盖在背景之上 */
.file-preview-pane .file-preview-container {
  position: relative;
  z-index: 1;
  background: var(--background);
}

/* 分栏拖拽条 - 始终显示 */
.files-resizer {
  width: 4px;
  background: var(--border);
  cursor: col-resize;
  flex-shrink: 0;
  transition: background var(--transition-fast, 150ms);
  position: relative;
  display: block;
}

.files-resizer:hover,
.files-resizer.dragging {
  background: var(--primary);
}

.files-resizer::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: -4px;
  right: -4px;
}

/* ===== 多文件标签栏 ===== */
.file-tabs-bar {
  display: flex;
  align-items: center;
  min-height: 36px;
  background: var(--glass-bg, rgba(255, 255, 255, 0.03));
  border-bottom: 1px solid var(--glass-border, rgba(255, 255, 255, 0.1));
  overflow: hidden;
}

.file-tabs-scroll {
  display: flex;
  align-items: center;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;  /* Firefox */
  -ms-overflow-style: none;  /* IE/Edge */
  flex: 1;
}

.file-tabs-scroll::-webkit-scrollbar {
  display: none;  /* Chrome/Safari */
}

.file-tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 12px;
  height: 36px;
  min-width: 0;
  max-width: 180px;
  background: transparent;
  border: none;
  border-right: 1px solid var(--glass-border, rgba(255, 255, 255, 0.05));
  cursor: pointer;
  transition: all var(--transition-fast, 150ms);
  position: relative;
}

.file-tab:hover {
  background: var(--glass-bg-hover, rgba(255, 255, 255, 0.05));
}

.file-tab.active {
  background: var(--glass-bg-hover, rgba(255, 255, 255, 0.08));
}

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

.file-tab.dragging {
  opacity: 0.5;
}

.file-tab.drag-over {
  background: var(--primary);
  background: rgba(var(--primary-rgb, 255, 255, 255), 0.15);
}

.tab-icon {
  flex-shrink: 0;
  font-size: 14px;
  line-height: 1;
}

.tab-name {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.8125rem;
  color: var(--muted-foreground);
  transition: color var(--transition-fast, 150ms);
}

.file-tab:hover .tab-name,
.file-tab.active .tab-name {
  color: var(--foreground);
}

.tab-dirty {
  flex-shrink: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--foreground);
  opacity: 0;
  transition: opacity var(--transition-fast, 150ms);
}

.file-tab.dirty .tab-dirty {
  opacity: 1;
}

.file-tab.dirty .tab-close {
  display: none;
}

.file-tab.dirty:hover .tab-dirty {
  display: none;
}

.file-tab.dirty:hover .tab-close {
  display: flex;
}

.tab-close {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: transparent;
  border-radius: 4px;
  cursor: pointer;
  color: var(--muted-foreground);
  opacity: 0;
  transition: all var(--transition-fast, 150ms);
}

.file-tab:hover .tab-close {
  opacity: 0.7;
}

.tab-close:hover {
  opacity: 1 !important;
  color: var(--foreground);
  background: var(--glass-bg-hover, rgba(255, 255, 255, 0.15));
}

.tab-close:active {
  background: rgba(239, 68, 68, 0.3);
  color: rgb(239, 68, 68);
}

.tab-close svg {
  width: 12px;
  height: 12px;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* 标签栏右键菜单 */
.tab-context-menu {
  position: fixed;
  min-width: 150px;
  padding: 4px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  z-index: 1000;
}

.tab-context-menu-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  font-size: 0.8125rem;
  color: var(--foreground);
  border-radius: calc(var(--radius) - 2px);
  cursor: pointer;
  transition: background var(--transition-fast, 150ms);
}

.tab-context-menu-item:hover {
  background: var(--muted);
}

.tab-context-menu-divider {
  height: 1px;
  margin: 4px 0;
  background: var(--border);
}

/* ===== 预览面板容器 ===== */
.file-preview-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--background);
  min-height: 0;
  overflow: hidden;
}

/* 分栏模式下的入场动画 */
.files-split-container.split-view .file-preview-container {
  animation: slideInRight var(--transition-normal, 200ms) ease-out;
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ===== 预览面板头部 ===== */
.file-preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.file-preview-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--foreground);
  min-width: 0;
  overflow: hidden;
}

.preview-icon {
  font-size: 1.125rem;
  flex-shrink: 0;
}

#preview-filename {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-preview-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.file-preview-actions > button {
  padding: 0.375rem 0.75rem;
  font-size: 0.75rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--background);
  color: var(--foreground);
  cursor: pointer;
  transition: all var(--transition-fast, 150ms);
}

.file-preview-actions > button:hover {
  background: var(--muted);
  border-color: var(--primary);
}

.file-preview-actions > button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

#preview-save-btn {
  background: var(--primary);
  color: var(--primary-foreground);
  border-color: var(--primary);
}

#preview-save-btn:hover {
  opacity: 0.9;
}

#preview-close-btn {
  background: transparent;
}

/* ===== 预览内容区域 ===== */
.file-preview-content {
  flex: 1;
  overflow: auto;
  padding: 1rem;
  background: var(--card);
  position: relative;
}

#file-preview-code {
  margin: 0;
  padding: 1rem;
  background: var(--muted);
  border-radius: var(--radius);
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.8125rem;
  line-height: 1.6;
  overflow-x: auto;
  white-space: pre-wrap;
  word-wrap: break-word;
  color: var(--foreground);
  min-height: 100%;
}

#file-preview-code code {
  font-family: inherit;
  background: transparent;
  padding: 0;
}

/* 编辑区域 */
#file-edit-area {
  width: 100%;
  height: 100%;
  min-height: 300px;
  padding: 1rem;
  background: var(--muted);
  border: 2px solid var(--primary);
  border-radius: var(--radius);
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--foreground);
  resize: none;
  outline: none;
}

#file-edit-area:focus {
  border-color: var(--ring);
  box-shadow: 0 0 0 2px hsl(var(--ring) / 0.2);
}

/* ===== 预览状态栏 ===== */
.file-preview-status {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.5rem 1rem;
  background: var(--muted);
  border-top: 1px solid var(--border);
  font-size: 0.6875rem;
  color: var(--muted-foreground);
  flex-shrink: 0;
}

.file-preview-status span {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

#preview-unsaved {
  color: var(--destructive);
  font-weight: 500;
}

#preview-unsaved::before {
  content: '●';
  font-size: 0.5rem;
  margin-right: 0.25rem;
}

/* ===== Explorer 状态指示器 ===== */
.explorer-status {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius);
  font-size: 0.6875rem;
  background: var(--muted);
  color: var(--muted-foreground);
  transition: all var(--transition-fast, 150ms);
}

.explorer-status-dot {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--muted-foreground);
  transition: background var(--transition-fast, 150ms);
}

/* 在线状态 */
.explorer-status.online {
  background: hsl(142 76% 36% / 0.15);
  color: hsl(142 76% 36%);
}

.explorer-status.online .explorer-status-dot {
  background: hsl(142 76% 36%);
  animation: pulse 2s infinite;
}

/* 连接中状态 */
.explorer-status.connecting {
  background: hsl(45 93% 47% / 0.15);
  color: hsl(45 93% 47%);
}

.explorer-status.connecting .explorer-status-dot {
  background: hsl(45 93% 47%);
  animation: blink 1s infinite;
}

/* 离线状态 */
.explorer-status.offline {
  background: var(--muted);
  color: var(--muted-foreground);
}

.explorer-status.offline .explorer-status-dot {
  background: var(--muted-foreground);
}

/* 重连中状态 */
.explorer-status.reconnecting {
  background: rgba(255, 255, 255, 0.1);
  color: var(--foreground);
}

.explorer-status.reconnecting .explorer-status-dot {
  background: var(--foreground);
  animation: blink 0.5s infinite;
}

/* 脉冲动画 */
@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

/* 闪烁动画 */
@keyframes blink {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.3;
  }
}

/* ===== 图片预览 ===== */
.file-preview-image {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  padding: 1rem;
}

.file-preview-image img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border-radius: var(--radius);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* ===== 不支持预览提示 ===== */
.file-preview-unsupported {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  gap: 1rem;
  color: var(--muted-foreground);
}

.file-preview-unsupported .unsupported-icon {
  font-size: 3rem;
  opacity: 0.5;
}

.file-preview-unsupported p {
  font-size: 0.875rem;
}

/* ===== 加载状态 ===== */
.file-preview-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  gap: 1rem;
}

.file-preview-loading .loading-spinner {
  width: 2rem;
  height: 2rem;
}

/* ===== 暗色主题适配 ===== */
body.dark .file-preview-container {
  background: var(--background);
}

body.dark #file-preview-code {
  background: hsl(222 47% 11%);
}

body.dark #file-edit-area {
  background: hsl(222 47% 11%);
}

/* ===== 视图切换按钮组 ===== */
.preview-view-toggle {
  display: inline-flex;
  gap: 2px;
  padding: 2px;
  background: var(--muted);
  border-radius: var(--radius);
  margin-right: 0.5rem;
}

.view-toggle-btn {
  width: 28px;
  height: 28px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: transparent;
  color: var(--muted-foreground);
  border-radius: calc(var(--radius) - 2px);
  cursor: pointer;
  transition: all var(--transition-fast, 150ms);
}

.view-toggle-btn:hover {
  color: var(--foreground);
  background: var(--background);
}

.view-toggle-btn.active {
  background: var(--primary);
  color: var(--primary-foreground);
}

.view-toggle-btn svg {
  width: 14px;
  height: 14px;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}

.view-toggle-btn svg path,
.view-toggle-btn svg circle {
  stroke: currentColor;
  fill: none;
}

/* ===== HTML 渲染预览 iframe ===== */
.file-preview-iframe {
  width: 100%;
  height: 100%;
  min-height: 300px;
  border: none;
  background: white;
  border-radius: var(--radius);
}

body.dark .file-preview-iframe {
  background: white;
}

/* ===== Markdown 渲染预览 ===== */
.markdown-preview {
  width: 100%;
  height: 100%;
  min-height: 300px;
  padding: 1.5rem;
  overflow-y: auto;
  background: var(--card);
  border-radius: var(--radius);
  color: var(--foreground);
  line-height: 1.7;
}

/* Markdown 标题 */
.markdown-preview h1,
.markdown-preview h2,
.markdown-preview h3,
.markdown-preview h4,
.markdown-preview h5,
.markdown-preview h6 {
  color: var(--foreground);
  font-weight: 600;
  margin-top: 1.5em;
  margin-bottom: 0.75em;
  line-height: 1.3;
}

.markdown-preview h1 { font-size: 1.875rem; border-bottom: 1px solid var(--border); padding-bottom: 0.5em; }
.markdown-preview h2 { font-size: 1.5rem; border-bottom: 1px solid var(--border); padding-bottom: 0.5em; }
.markdown-preview h3 { font-size: 1.25rem; }
.markdown-preview h4 { font-size: 1.125rem; }
.markdown-preview h5 { font-size: 1rem; }
.markdown-preview h6 { font-size: 0.875rem; color: var(--muted-foreground); }

.markdown-preview h1:first-child,
.markdown-preview h2:first-child,
.markdown-preview h3:first-child {
  margin-top: 0;
}

/* Markdown 段落和文本 */
.markdown-preview p {
  margin-bottom: 1em;
  color: var(--foreground);
}

.markdown-preview strong {
  font-weight: 600;
  color: var(--foreground);
}

.markdown-preview em {
  font-style: italic;
}

/* Markdown 链接 */
.markdown-preview a {
  color: var(--primary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s ease;
}

.markdown-preview a:hover {
  border-bottom-color: var(--primary);
}

/* Markdown 列表 */
.markdown-preview ul,
.markdown-preview ol {
  margin-bottom: 1em;
  padding-left: 1.5em;
}

.markdown-preview li {
  margin-bottom: 0.25em;
}

.markdown-preview li > p {
  margin-bottom: 0.5em;
}

/* Markdown 内联代码 */
.markdown-preview code {
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.875em;
  background: var(--glass-bg, rgba(255, 255, 255, 0.05));
  border: 1px solid var(--glass-border, rgba(255, 255, 255, 0.1));
  padding: 0.2em 0.4em;
  border-radius: 4px;
  color: var(--foreground);
}

/* Markdown 代码块 */
.markdown-preview pre {
  margin: 1em 0;
  padding: 1rem;
  background: var(--muted);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow-x: auto;
}

.markdown-preview pre code {
  background: transparent;
  border: none;
  padding: 0;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--foreground);
}

/* Markdown 引用块 */
.markdown-preview blockquote {
  margin: 1em 0;
  padding: 0.75em 1em;
  border-left: 4px solid var(--primary);
  background: var(--glass-bg, rgba(255, 255, 255, 0.03));
  color: var(--muted-foreground);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.markdown-preview blockquote p:last-child {
  margin-bottom: 0;
}

/* Markdown 水平线 */
.markdown-preview hr {
  margin: 2em 0;
  border: none;
  border-top: 1px solid var(--border);
}

/* Markdown 表格 */
.markdown-preview table {
  width: 100%;
  margin: 1em 0;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.markdown-preview th,
.markdown-preview td {
  padding: 0.75em 1em;
  border: 1px solid var(--border);
  text-align: left;
}

.markdown-preview th {
  background: var(--muted);
  font-weight: 600;
  color: var(--foreground);
}

.markdown-preview tr:nth-child(even) {
  background: var(--glass-bg, rgba(255, 255, 255, 0.02));
}

/* Markdown 图片 */
.markdown-preview img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  margin: 1em 0;
}

/* Markdown 任务列表 */
.markdown-preview input[type="checkbox"] {
  margin-right: 0.5em;
  accent-color: var(--primary);
}

/* 深色主题适配 */
body.dark .markdown-preview {
  background: var(--card);
}

body.dark .markdown-preview pre {
  background: hsl(222 47% 11%);
}

/* ===== 增强型图片预览 ===== */
.image-preview-container {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  background: var(--muted);
  border-radius: var(--radius);
  overflow: hidden;
}

/* 图片容器 - 棋盘格背景（用于透明图片） */
.image-viewer {
  flex: 1;
  position: relative;
  overflow: hidden;
  background-image: 
    linear-gradient(45deg, rgba(255,255,255,0.05) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(255,255,255,0.05) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(255,255,255,0.05) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(255,255,255,0.05) 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
  cursor: grab;
}

.image-viewer.dragging {
  cursor: grabbing;
}

.image-viewer img {
  position: absolute;
  max-width: none;
  max-height: none;
  transition: transform 0.1s ease-out;
  user-select: none;
  -webkit-user-drag: none;
}

/* 图片工具栏 */
.image-toolbar {
  position: absolute;
  bottom: 1rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px;
  background: var(--glass-bg, rgba(0, 0, 0, 0.7));
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--glass-border, rgba(255, 255, 255, 0.1));
  border-radius: var(--radius);
  z-index: 10;
}

.image-toolbar button {
  width: 32px;
  height: 32px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: transparent;
  color: var(--foreground);
  border-radius: calc(var(--radius) - 2px);
  cursor: pointer;
  transition: all var(--transition-fast, 150ms);
}

.image-toolbar button:hover {
  background: var(--glass-bg-hover, rgba(255, 255, 255, 0.1));
}

.image-toolbar button:active {
  transform: scale(0.95);
}

.image-toolbar button svg {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}

.image-toolbar .toolbar-divider {
  width: 1px;
  height: 20px;
  background: var(--border);
  margin: 0 4px;
}

.image-toolbar .zoom-level {
  min-width: 48px;
  text-align: center;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--muted-foreground);
  font-family: var(--font-mono, monospace);
}

/* 图片信息栏 */
.image-info {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 0.5rem 1rem;
  background: var(--card);
  border-top: 1px solid var(--border);
  font-size: 0.75rem;
  color: var(--muted-foreground);
}

.image-info span {
  display: flex;
  align-items: center;
  gap: 4px;
}

.image-info .info-divider {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--muted-foreground);
  opacity: 0.5;
}

/* 图片加载状态 */
.image-loading {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  color: var(--muted-foreground);
}

.image-loading .spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* 图片加载错误 */
.image-error {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--destructive);
  text-align: center;
}

.image-error svg {
  width: 48px;
  height: 48px;
  stroke: currentColor;
  stroke-width: 1.5;
}

/* ===== PDF 预览 ===== */
.pdf-preview-container {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  background: var(--muted);
  border-radius: var(--radius);
  overflow: hidden;
}

/* PDF 查看器 */
.pdf-viewer {
  flex: 1;
  position: relative;
  overflow: auto;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 1rem;
  background: rgba(0, 0, 0, 0.3);
}

.pdf-canvas {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  background: white;
}

/* PDF 工具栏 */
.pdf-toolbar {
  position: absolute;
  bottom: 1rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px 10px;
  background: var(--glass-bg, rgba(0, 0, 0, 0.7));
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--glass-border, rgba(255, 255, 255, 0.1));
  border-radius: var(--radius);
  z-index: 10;
}

.pdf-toolbar button {
  width: 32px;
  height: 32px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: transparent;
  color: var(--foreground);
  border-radius: calc(var(--radius) - 2px);
  cursor: pointer;
  transition: all var(--transition-fast, 150ms);
  font-size: 1rem;
}

.pdf-toolbar button:hover {
  background: var(--glass-bg-hover, rgba(255, 255, 255, 0.1));
}

.pdf-toolbar button:active {
  transform: scale(0.95);
}

.pdf-toolbar button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.pdf-toolbar-divider {
  width: 1px;
  height: 20px;
  background: var(--border);
  margin: 0 4px;
}

.pdf-page-info {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.8125rem;
  color: var(--foreground);
}

.pdf-page-input {
  width: 40px;
  padding: 2px 4px;
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) - 2px);
  background: rgba(255, 255, 255, 0.1);
  color: var(--foreground);
  font-size: 0.8125rem;
  text-align: center;
  -moz-appearance: textfield;
}

.pdf-page-input::-webkit-outer-spin-button,
.pdf-page-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.pdf-page-input:focus {
  outline: none;
  border-color: var(--primary);
}

.pdf-page-separator {
  color: var(--muted-foreground);
}

.pdf-total-pages {
  min-width: 24px;
}

.pdf-zoom-level {
  min-width: 48px;
  text-align: center;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--muted-foreground);
  font-family: var(--font-mono, monospace);
}

/* PDF 信息栏 */
.pdf-info {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 0.5rem 1rem;
  background: var(--card);
  border-top: 1px solid var(--border);
  font-size: 0.75rem;
  color: var(--muted-foreground);
}

.pdf-info span {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* PDF 加载状态 */
.pdf-loading {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  color: var(--muted-foreground);
}

.pdf-loading .spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* ===== 当前预览文件高亮 ===== */
.file-item.previewing {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--primary);
}

.file-item.previewing .file-name {
  color: var(--primary);
}

/* ===== 外部修改提示条 ===== */
.external-change-notice {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 1rem;
  background: linear-gradient(135deg, hsl(45 93% 47% / 0.15), hsl(45 93% 47% / 0.1));
  border-bottom: 1px solid hsl(45 93% 47% / 0.3);
  color: hsl(45 93% 55%);
  font-size: 0.8125rem;
  flex-shrink: 0;
  animation: slideDown 0.2s ease-out;
}

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

.external-change-notice .notice-icon {
  font-size: 1rem;
  flex-shrink: 0;
}

.external-change-notice .notice-text {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.external-change-notice .notice-btn {
  padding: 0.375rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 500;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition-fast, 150ms);
  flex-shrink: 0;
}

.external-change-notice .reload-btn {
  background: hsl(45 93% 47%);
  color: hsl(0 0% 10%);
}

.external-change-notice .reload-btn:hover {
  background: hsl(45 93% 55%);
}

.external-change-notice .keep-btn {
  background: transparent;
  color: hsl(45 93% 55%);
  border: 1px solid hsl(45 93% 47% / 0.5);
}

.external-change-notice .keep-btn:hover {
  background: hsl(45 93% 47% / 0.15);
  border-color: hsl(45 93% 55%);
}

.external-change-notice .close-btn {
  width: 24px;
  height: 24px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: hsl(45 93% 55%);
  font-size: 1rem;
  line-height: 1;
}

.external-change-notice .close-btn:hover {
  background: hsl(45 93% 47% / 0.2);
}

/* 标签页外部修改指示器 */
.file-tab.externally-modified::before {
  content: '';
  position: absolute;
  top: 4px;
  right: 4px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: hsl(45 93% 47%);
  animation: pulse 2s infinite;
}

/* ===== 响应式适配 ===== */
@media (max-width: 640px) {
  .file-preview-header {
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  
  .file-preview-title {
    flex: 1 1 100%;
  }
  
  .file-preview-actions {
    flex: 1 1 100%;
    justify-content: flex-end;
  }
  
  .file-preview-status {
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  
  /* 小屏幕下分栏变为上下布局（预览区在上，文件列表在下） */
  .files-split-container {
    flex-direction: column-reverse; /* 保持预览区在上作为主视觉区域 */
  }
  
  .files-split-container .files-list-pane {
    flex: 0 0 40% !important;
    max-width: 100%;
    min-width: 0;
    border-left: none;
    border-top: 1px solid var(--border);
  }
  
  .files-split-container .files-resizer {
    width: 100%;
    height: 4px;
    cursor: row-resize;
  }
  
  .files-split-container .file-preview-pane {
    min-width: 0;
    min-height: 200px;
  }
}

/* ===== 浅色主题样式 ===== */
body:not(.dark) .file-preview-container {
  background: var(--background);
}

body:not(.dark) #file-preview-code {
  background: hsl(0 0% 97%);
}

body:not(.dark) #file-edit-area {
  background: hsl(0 0% 97%);
}

body:not(.dark) .markdown-preview {
  background: var(--card);
}

body:not(.dark) .markdown-preview pre {
  background: hsl(0 0% 95%);
}

/* 文件预览面板背景 - 浅色主题 */
body:not(.dark) .file-preview-pane {
  background: #fff;
}

/* 多文件标签栏 - 浅色主题 */
body:not(.dark) .file-tabs-bar {
  background: var(--glass-bg, rgba(0, 0, 0, 0.03));
  border-bottom: 1px solid var(--glass-border, rgba(0, 0, 0, 0.1));
}

body:not(.dark) .file-tab {
  border-right: 1px solid var(--glass-border, rgba(0, 0, 0, 0.05));
}

body:not(.dark) .file-tab:hover {
  background: var(--glass-bg-hover, rgba(0, 0, 0, 0.05));
}

body:not(.dark) .file-tab.active {
  background: var(--glass-bg-hover, rgba(0, 0, 0, 0.08));
}

body:not(.dark) .tab-close:hover {
  background: var(--glass-bg-hover, rgba(0, 0, 0, 0.15));
}

/* 图片工具栏 - 浅色主题 */
body:not(.dark) .image-toolbar {
  background: var(--glass-bg, rgba(255, 255, 255, 0.7));
  border: 1px solid var(--glass-border, rgba(0, 0, 0, 0.1));
}

body:not(.dark) .image-toolbar button:hover {
  background: var(--glass-bg-hover, rgba(0, 0, 0, 0.1));
}

/* PDF 工具栏 - 浅色主题 */
body:not(.dark) .pdf-toolbar {
  background: var(--glass-bg, rgba(255, 255, 255, 0.7));
  border: 1px solid var(--glass-border, rgba(0, 0, 0, 0.1));
}

body:not(.dark) .pdf-toolbar button:hover {
  background: var(--glass-bg-hover, rgba(0, 0, 0, 0.1));
}

body:not(.dark) .pdf-page-input {
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.1);
}

/* Markdown 内联代码 - 浅色主题 */
body:not(.dark) .markdown-preview code {
  background: var(--glass-bg, rgba(0, 0, 0, 0.05));
  border: 1px solid var(--glass-border, rgba(0, 0, 0, 0.1));
}

/* Markdown 引用块 - 浅色主题 */
body:not(.dark) .markdown-preview blockquote {
  background: var(--glass-bg, rgba(0, 0, 0, 0.03));
}

/* Markdown 表格 - 浅色主题 */
body:not(.dark) .markdown-preview tr:nth-child(even) {
  background: var(--glass-bg, rgba(0, 0, 0, 0.02));
}

/* Three.js 动态背景容器 - 浅色主题 */
body:not(.dark) .preview-threejs-bg {
  background: #f8f8f8;
}

/* 图片查看器棋盘格背景 - 浅色主题 */
body:not(.dark) .image-viewer {
  background-image: 
    linear-gradient(45deg, rgba(0,0,0,0.05) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(0,0,0,0.05) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(0,0,0,0.05) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(0,0,0,0.05) 75%);
}

/* PDF 查看器背景 - 浅色主题 */
body:not(.dark) .pdf-viewer {
  background: rgba(0, 0, 0, 0.1);
}

/* 重连中状态 - 浅色主题 */
body:not(.dark) .explorer-status.reconnecting {
  background: rgba(0, 0, 0, 0.1);
}

/* 当前预览文件高亮 - 浅色主题 */
body:not(.dark) .file-item.previewing {
  background: rgba(0, 0, 0, 0.1);
}