* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f5f7fa;
  --bg-sidebar: #ffffff;
  --border-color: #e6edf4;
  --text-primary: #1f2f3e;
  --text-secondary: #4a5a72;
  --text-muted: #7c8ba0;
  --accent-color: #2c6bff;
  --accent-light: #f0f5ff;
  --accent-bg: #e8f0fe;
  --hover-bg: #f0f5ff;
  --code-bg: #f0f4f9;
  --code-text: #c7254e;
  --blockquote-bg: #f5f9ff;
  --blockquote-border: #2c6bff;
  --table-header-bg: #f8fafc;
  --scrollbar-thumb: #cbd5e1;
  --scrollbar-track: #f1f1f1;
  --shadow-light: 0 1px 2px rgba(0,0,0,0.05);
  --icon-fill: none;
  --icon-stroke: currentColor;
  --icon-stroke-width: 1.8;
  
  /* 代码块主题变量 */
  --pre-bg: #f6f8fa;
  --pre-border: #d0d7de;
  --pre-text: #1f2328;
}

/* 护眼主题 */
[data-theme="eye-care"] {
  --bg-primary: #f4efe2;
  --bg-secondary: #ede7d9;
  --bg-sidebar: #faf6ed;
  --border-color: #d6ccb8;
  --text-primary: #3e3a35;
  --text-secondary: #5c5548;
  --text-muted: #8b8470;
  --accent-color: #6b8c5c;
  --accent-light: #eef3e8;
  --accent-bg: #e2ebd8;
  --hover-bg: #e8f0dd;
  --code-bg: #e9e4d4;
  --code-text: #b54a4a;
  --blockquote-bg: #f3efe2;
  --blockquote-border: #6b8c5c;
  --table-header-bg: #f0ebdb;
  --scrollbar-thumb: #c7bc9e;
  --scrollbar-track: #e3dccb;
  --pre-bg: #f0ecdd;
  --pre-border: #d6ccb8;
  --pre-text: #3e3a35;
}

/* 夜间主题 */
[data-theme="night"] {
  --bg-primary: #1e1e2e;
  --bg-secondary: #16162a;
  --bg-sidebar: #1e1e2e;
  --border-color: #2e2e42;
  --text-primary: #e2e2e2;
  --text-secondary: #b0b0c0;
  --text-muted: #7a7a8e;
  --accent-color: #7aa2f7;
  --accent-light: #2a2a40;
  --accent-bg: #2a2a48;
  --hover-bg: #2a2a48;
  --code-bg: #2a2a3c;
  --code-text: #f0a0a0;
  --blockquote-bg: #252540;
  --blockquote-border: #7aa2f7;
  --table-header-bg: #2a2a40;
  --scrollbar-thumb: #4a4a6a;
  --scrollbar-track: #2a2a3a;
  --pre-bg: #1e1e2e;
  --pre-border: #2e2e42;
  --pre-text: #e2e2e2;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  background: var(--bg-secondary);
  color: var(--text-primary);
  height: 100vh;
  overflow: hidden;
  transition: background 0.3s ease, color 0.3s ease;
}

.app-layout {
  display: flex;
  height: 100vh;
  width: 100%;
}

/* ===== 侧边栏 ===== */
.sidebar {
  width: 280px;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  flex-shrink: 0;
  transition: transform 0.25s ease, background 0.3s;
  z-index: 20;
  position: relative;
}

.sidebar-header {
  padding: 20px 20px 12px 20px;
  border-bottom: 1px solid var(--border-color);
}

.sidebar-header h2 {
  font-size: 18px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  color: var(--text-primary);
}

.sidebar-header p {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
}

.nav-controls {
  padding: 12px 12px 8px 12px;
  border-bottom: 1px solid var(--border-color);
}

.history-buttons {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}

.history-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 12px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--text-secondary);
  transition: all 0.2s;
}

.history-btn:hover:not(:disabled) {
  background: var(--accent-light);
  color: var(--accent-color);
}

.history-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.path-bar {
  font-size: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  background: var(--bg-secondary);
  padding: 8px 10px;
  border-radius: 8px;
  color: var(--text-secondary);
}

.path-segment {
  cursor: pointer;
  color: var(--text-secondary);
  transition: color 0.2s;
}

.path-segment:hover {
  color: var(--accent-color);
}

.path-segment.current {
  color: var(--text-primary);
  font-weight: 500;
  cursor: default;
}

.path-separator {
  color: var(--text-muted);
}

.folder-list {
  flex: 1;
  overflow-y: auto;
  padding: 16px 12px;
}

.folder-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  margin-bottom: 4px;
  border-radius: 8px;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all 0.2s;
}

.folder-item:hover {
  background: var(--hover-bg);
  color: var(--accent-color);
}

.toc-container {
  flex: 1;
  overflow-y: auto;
  padding: 16px 8px 20px 12px;
}

.toc-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.toc-tree {
  list-style: none;
  padding-left: 0;
}

.toc-item {
  font-size: 13px;
  padding: 5px 0 5px 12px;
  cursor: pointer;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: all 0.2s;
  border-left: 2px solid transparent;
  border-radius: 0 6px 6px 0;
  line-height: 1.4;
}

.toc-item:hover {
  color: var(--accent-color);
  border-left-color: var(--accent-color);
  background: var(--accent-light);
}

.toc-item.active {
  color: var(--accent-color);
  border-left-color: var(--accent-color);
  background: var(--accent-bg);
  font-weight: 500;
}

.toc-item.level-1 { padding-left: 12px; font-weight: 600; }
.toc-item.level-2 { padding-left: 24px; }
.toc-item.level-3 { padding-left: 36px; }
.toc-item.level-4 { padding-left: 48px; }
.toc-item.level-5 { padding-left: 60px; }
.toc-item.level-6 { padding-left: 72px; }

.theme-switcher {
  display: flex;
  gap: 6px;
  padding: 8px 12px;
  border-top: 1px solid var(--border-color);
  background: var(--bg-sidebar);
}

.theme-btn {
  flex: 1;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 5px 8px;
  font-size: 11px;
  cursor: pointer;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  transition: all 0.2s;
}

.theme-btn.active {
  background: var(--accent-light);
  color: var(--accent-color);
  border-color: var(--accent-color);
  font-weight: 500;
}

.refresh-btn {
  position: absolute;
  bottom: 70px;
  right: 16px;
  background: var(--bg-secondary);
  border: none;
  border-radius: 24px;
  padding: 6px 12px;
  font-size: 12px;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  z-index: 25;
  box-shadow: var(--shadow-light);
  transition: all 0.2s;
}

.refresh-btn:hover {
  background: var(--border-color);
  color: var(--text-primary);
}

/* ===== 内容区域 ===== */
.content-area {
  flex: 1;
  overflow-y: auto;
  background: var(--bg-primary);
  padding: 32px 48px 64px 48px;
  transition: background 0.3s;
}

.markdown-body {
  font-size: 15px;
  line-height: 1.65;
  color: var(--text-primary);
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  scroll-margin-top: 80px;
  color: var(--text-primary);
}

.markdown-body h1 {
  font-size: 28px;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 8px;
  margin: 28px 0 20px 0;
  font-weight: 600;
}
.markdown-body h2 {
  font-size: 22px;
  margin: 28px 0 16px 0;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 6px;
}
.markdown-body h3 {
  font-size: 19px;
  margin: 24px 0 12px 0;
}
.markdown-body p {
  margin: 14px 0;
  line-height: 1.7;
}

/* ===== 图片样式 - 自适应不超出文本区域 ===== */
.markdown-body img {
  max-width: 100%;
  max-height: 600px;
  height: auto;
  width: auto;
  border-radius: 8px;
  display: block;
  margin: 16px auto;
  object-fit: contain;
  transition: opacity 0.3s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  background: var(--bg-secondary);
}

/* 图片加载占位 */
.markdown-body img[loading="lazy"] {
  background: var(--bg-secondary);
  min-height: 100px;
}

/* 包含图片的段落居中 */
.markdown-body p:has(img) {
  text-align: center;
  margin: 16px 0;
}

/* 小屏幕适配 */
@media (max-width: 768px) {
  .markdown-body img {
    max-height: 400px;
    border-radius: 6px;
  }
}

/* 手机屏幕 */
@media (max-width: 480px) {
  .markdown-body img {
    max-height: 300px;
  }
}

/* 夜间模式图片边框微调 */
[data-theme="night"] .markdown-body img {
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
  border: 1px solid var(--border-color);
}

/* 护眼模式图片微调 */
[data-theme="eye-care"] .markdown-body img {
  box-shadow: 0 2px 8px rgba(100, 80, 50, 0.1);
}

/* ===== 代码块 ===== */
.code-block-wrapper {
  position: relative;
  margin: 16px 0;
  border-radius: 12px;
  overflow: hidden;
}

.markdown-body pre {
  background: var(--pre-bg);
  border: 1px solid var(--pre-border);
  border-radius: 12px;
  padding: 16px;
  padding-right: 50px;
  overflow-x: auto;
  margin: 0;
}

.markdown-body pre code {
  background: transparent;
  color: var(--pre-text);
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 13px;
  line-height: 1.5;
}

/* ===== 复制按钮 ===== */
.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 12px;
  cursor: pointer;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 4px;
  transition: all 0.2s;
  z-index: 5;
  opacity: 0.7;
}

.copy-btn:hover {
  background: var(--accent-light);
  color: var(--accent-color);
  border-color: var(--accent-color);
  opacity: 1;
}

.copy-btn.copied {
  background: #d4edda;
  color: #155724;
  border-color: #c3e6cb;
}

.markdown-body code:not(pre code) {
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 5px;
  font-family: monospace;
  font-size: 13px;
  color: var(--code-text);
}

.markdown-body table {
  border-collapse: collapse;
  width: 100%;
  margin: 16px 0;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: var(--shadow-light);
}

.markdown-body th,
.markdown-body td {
  border: 1px solid var(--border-color);
  padding: 10px 14px;
  text-align: left;
  color: var(--text-primary);
}

.markdown-body th {
  background: var(--table-header-bg);
  font-weight: 600;
}

.markdown-body blockquote {
  border-left: 4px solid var(--blockquote-border);
  background: var(--blockquote-bg);
  padding: 12px 20px;
  margin: 16px 0;
  border-radius: 8px;
  color: var(--text-primary);
}

.markdown-body ul,
.markdown-body ol {
  padding-left: 28px;
  margin: 12px 0;
}

.markdown-body .doc-separator {
  margin: 48px 0;
  border: none;
  border-top: 2px dashed var(--border-color);
  position: relative;
}

.markdown-body .doc-separator::before {
  content: "§";
  position: absolute;
  left: 50%;
  top: -12px;
  transform: translateX(-50%);
  background: var(--bg-primary);
  padding: 0 16px;
  color: var(--text-muted);
  font-size: 14px;
}

/* ===== Mermaid 图表样式 ===== */
.mermaid {
  background: var(--pre-bg);
  border: 1px solid var(--pre-border);
  border-radius: 12px;
  padding: 20px;
  margin: 16px 0;
  text-align: center;
  overflow-x: auto;
  transition: background 0.3s ease, border-color 0.3s ease;
}

.mermaid svg {
  display: block;
  margin: 0 auto;
  max-width: 100%;
  height: auto;
}

/* ===== Mermaid 容器（点击放大） ===== */
.mermaid-container {
  position: relative;
  cursor: pointer;
  transition: all 0.2s ease;
}

.mermaid-container:hover {
  opacity: 0.95;
}

.mermaid-container .mermaid {
  margin: 0;
  pointer-events: none;
}

/* 放大提示 */
.mermaid-container .zoom-hint {
  position: absolute;
  bottom: 12px;
  right: 16px;
  background: rgba(0, 0, 0, 0.6);
  color: #fff;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
  backdrop-filter: blur(4px);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

.mermaid-container:hover .zoom-hint {
  opacity: 1;
}

/* ===== 图片查看器 - 支持缩放拖拽 ===== */
.mermaid-viewer-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.85);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  backdrop-filter: blur(8px);
}

.mermaid-viewer-overlay.active {
  opacity: 1;
  visibility: visible;
}

.mermaid-viewer-overlay .viewer-content {
  position: relative;
  width: 92vw;
  height: 90vh;
  background: var(--bg-primary);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  transform: scale(0.9);
  transition: transform 0.3s ease;
}

.mermaid-viewer-overlay.active .viewer-content {
  transform: scale(1);
}

/* 查看器滚动容器 */
.mermaid-viewer-overlay .viewer-scroll-container {
  width: 100%;
  height: 100%;
  overflow: hidden;
  position: relative;
  cursor: grab;
  background: var(--bg-primary);
}

.mermaid-viewer-overlay .viewer-scroll-container:active {
  cursor: grabbing;
}

/* SVG 包裹容器 - 用于 transform */
.mermaid-viewer-overlay .viewer-svg-wrapper {
  position: absolute;
  top: 0;
  left: 0;
  transform-origin: 0 0;
  will-change: transform;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 100%;
  min-height: 100%;
}

.mermaid-viewer-overlay .viewer-svg-wrapper .mermaid-viewer-svg {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.mermaid-viewer-overlay .viewer-svg-wrapper .mermaid-viewer-svg svg {
  max-width: none;
  max-height: none;
  display: block;
  width: auto;
  height: auto;
}

/* 查看器中的图片样式 */
.mermaid-viewer-overlay .viewer-svg-wrapper .mermaid-viewer-svg img {
  max-width: 90vw;
  max-height: 85vh;
  object-fit: contain;
  border-radius: 8px;
  display: block;
}

/* 缩放控制按钮 */
.mermaid-viewer-overlay .viewer-controls {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 10001;
  background: rgba(0, 0, 0, 0.6);
  padding: 8px 16px;
  border-radius: 30px;
  backdrop-filter: blur(8px);
}

.mermaid-viewer-overlay .viewer-controls button {
  background: transparent;
  border: none;
  color: #fff;
  cursor: pointer;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 14px;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  transition: background 0.2s ease;
  display: flex;
  align-items: center;
  gap: 4px;
}

.mermaid-viewer-overlay .viewer-controls button:hover {
  background: rgba(255, 255, 255, 0.2);
}

.mermaid-viewer-overlay .viewer-controls .zoom-level {
  color: rgba(255, 255, 255, 0.7);
  font-size: 13px;
  padding: 6px 12px;
  min-width: 50px;
  text-align: center;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* 关闭按钮 */
.mermaid-viewer-overlay .viewer-close {
  position: fixed;
  top: 24px;
  right: 32px;
  background: rgba(255, 255, 255, 0.15);
  border: none;
  color: #fff;
  cursor: pointer;
  padding: 10px 16px;
  border-radius: 10px;
  transition: background 0.2s ease;
  z-index: 10000;
}

.mermaid-viewer-overlay .viewer-close:hover {
  background: rgba(255, 255, 255, 0.25);
}

.mermaid-viewer-overlay .viewer-close svg {
  width: 28px;
  height: 28px;
  fill: none;
  stroke: #fff;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  display: block;
}

/* 缩放指示器 - 显示在右下角 */
.mermaid-viewer-overlay .viewer-zoom-indicator {
  position: absolute;
  bottom: 80px;
  right: 24px;
  background: rgba(0, 0, 0, 0.6);
  color: #fff;
  padding: 4px 12px;
  border-radius: 16px;
  font-size: 12px;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  backdrop-filter: blur(4px);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.mermaid-viewer-overlay .viewer-zoom-indicator.show {
  opacity: 1;
}

/* ===== 滚动条 ===== */
::-webkit-scrollbar {
  width: 5px;
  height: 5px;
}
::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 4px;
}

/* ===== 其他 ===== */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  color: var(--text-muted);
  text-align: center;
}

.icon-outline {
  fill: none;
  stroke: currentColor;
  stroke-width: var(--icon-stroke-width);
  stroke-linecap: round;
  stroke-linejoin: round;
}

.mobile-mask {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.4);
  z-index: 15;
}

/* ===== 移动端响应式 ===== */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    transform: translateX(-100%);
    height: 100vh;
    width: 85%;
    max-width: 280px;
  }
  .sidebar.mobile-open {
    transform: translateX(0);
  }
  .content-area {
    padding: 20px;
  }
  .refresh-btn {
    bottom: 80px;
    right: 16px;
  }

  .mermaid-viewer-overlay .viewer-content {
    width: 98vw;
    height: 96vh;
    border-radius: 12px;
  }
  
  .mermaid-viewer-overlay .viewer-close {
    top: 12px;
    right: 12px;
    padding: 8px 12px;
  }

  .mermaid-viewer-overlay .viewer-close svg {
    width: 22px;
    height: 22px;
  }

  .mermaid-viewer-overlay .viewer-controls {
    bottom: 16px;
    padding: 6px 12px;
    gap: 6px;
  }

  .mermaid-viewer-overlay .viewer-controls button {
    padding: 4px 10px;
    font-size: 12px;
  }

  .mermaid-viewer-overlay .viewer-controls .zoom-level {
    font-size: 11px;
    padding: 4px 8px;
    min-width: 40px;
  }

  .mermaid-container .zoom-hint {
    font-size: 10px;
    padding: 3px 10px;
    bottom: 8px;
    right: 10px;
  }

  .mermaid-viewer-overlay .viewer-svg-wrapper .mermaid-viewer-svg img {
    max-width: 95vw;
    max-height: 80vh;
  }
}