/*
  custom.css — 自定义样式覆盖
  ==================================
  覆盖 docsify 默认样式和 docsify-themeable 主题变量。
  修改 :root 中的变量即可全局调整。

  包含：
    - 主题变量 / 字体 / 侧边栏 / 内容区
    - 代码块增强 + 行号 + 复制按钮
    - 表格 / 列表 / 图片 / 引用块
    - 思维链 / 引导卡片 / 徽章 / 警告提示
    - 固定工具栏（回到顶部 + 思维导图切换）
    - Mermaid 全屏遮罩 + 导出
    - Markmap 思维导图容器 + 深色适配
    - 响应式 + 打印样式
*/

/* ═══════════════════════════════════════════
   主题变量
   ═══════════════════════════════════════════ */
:root {
  /* 主色调 */
  --theme-color: #42b983;
  --theme-color-dark: #359e6b;

  /* 品牌色（工具栏/全屏遮罩使用） */
  --brand: #7c5cfc;
  --brand-light: #9b7efd;
  --brand-dark: #5a3db8;

  /* 深色主题背景变量 */
  --bg-primary: #f8f9fa;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-code: #f4f4f4;
  --text-primary: #333333;
  --text-secondary: #666666;
  --text-muted: #999999;
  --border: #e0e0e0;

  /* 字体 */
  --base-font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Helvetica Neue", Helvetica, Arial, sans-serif;
  --code-font-family: "Fira Code", "Source Code Pro", Consolas,
    "Courier New", monospace;

  /* 侧边栏 */
  --sidebar-width: 20rem;
  --sidebar-background: var(--bg-secondary);
  --sidebar-name-color: var(--theme-color);

  /* 内容区 */
  --content-max-width: 55em;
  --heading-h1-font-size: 2rem;
  --heading-h2-font-size: 1.5rem;
  --heading-h3-font-size: 1.25rem;

  /* 代码块 */
  --code-font-size: 0.9rem;
  --code-block-padding: 1rem;
  --code-block-border-radius: 6px;

  /* 圆角 */
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
}

/* ═══════════════════════════════════════════
   全局基础
   ═══════════════════════════════════════════ */
* {
  box-sizing: border-box;
}

body {
  font-family: var(--base-font-family);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 16px;
}

/* 滚动条 */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--brand-dark);
}

/* ═══════════════════════════════════════════
   侧边栏
   ═══════════════════════════════════════════ */
.sidebar {
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  color: var(--text-primary);
}
.sidebar a {
  color: var(--text-secondary);
  transition: var(--transition);
  border-radius: var(--radius-sm);
  padding: 6px 12px;
  margin: 2px 8px;
}
.sidebar a:hover {
  color: var(--brand-light);
  background: rgba(124, 92, 252, 0.1);
}
.sidebar ul li a.active {
  color: var(--brand);
  border-left: 3px solid var(--brand);
  background: rgba(124, 92, 252, 0.08);
}

/* ═══════════════════════════════════════════
   链接样式
   ═══════════════════════════════════════════ */
.markdown-section a {
  color: var(--brand-light);
  text-decoration: none;
  transition: var(--transition);
  border-bottom: 1px solid transparent;
}
.markdown-section a:hover {
  color: var(--brand);
  border-bottom-color: var(--brand);
}

/* ═══════════════════════════════════════════
   代码块增强
   ═══════════════════════════════════════════ */
.markdown-section pre {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  overflow-x: auto;
  position: relative;
  margin: 20px 0;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.05);
  transition: var(--transition);
}
.markdown-section pre:hover {
  border-color: var(--brand);
}
.markdown-section code {
  font-family: var(--code-font-family);
  font-size: 0.88em;
  background: rgba(124, 92, 252, 0.06);
  color: var(--brand-dark);
  padding: 2px 6px;
  border-radius: 4px;
}
.markdown-section pre code {
  background: transparent;
  color: var(--text-primary);
  padding: 0;
  border-radius: 0;
  font-size: 0.92em;
  line-height: 1.65;
}

/* 代码块语言标签（右上角） */
.markdown-section pre[data-lang]::before {
  content: attr(data-lang);
  display: block;
  position: absolute;
  top: 0;
  right: 0;
  background: var(--brand-dark);
  color: #fff;
  padding: 3px 12px;
  font-size: 0.7em;
  border-radius: 0 var(--radius-sm) 0 var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 600;
  opacity: 0.85;
  z-index: 2;
}

/* Prism 行号 */
.line-numbers .line-numbers-rows {
  border-right: 1px solid var(--border) !important;
  padding: 20px 0 !important;
  top: 0;
}
.line-numbers .line-numbers-rows > span::before {
  color: var(--text-muted) !important;
  padding-right: 12px !important;
}
.markdown-section pre.line-numbers {
  padding-left: 60px !important;
}

/* 复制按钮 */
.docsify-copy-code-button {
  background: var(--brand-dark) !important;
  border: 1px solid var(--brand) !important;
  border-radius: var(--radius-sm) !important;
  color: #fff !important;
  font-size: 0.75em !important;
  padding: 4px 14px !important;
  transition: var(--transition);
  cursor: pointer;
  z-index: 3;
}
.docsify-copy-code-button:hover {
  background: var(--brand) !important;
  border-color: var(--brand-light) !important;
}
.docsify-copy-code-button.success {
  background: #2d7d46 !important;
  border-color: #4ade80 !important;
}

/* ═══════════════════════════════════════════
   表格
   ═══════════════════════════════════════════ */
.markdown-section table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 16px 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.markdown-section table thead {
  background: linear-gradient(135deg, var(--brand-dark), var(--brand));
}
.markdown-section table th {
  color: #fff;
  font-weight: 600;
  padding: 12px 16px;
  text-align: left;
  font-size: 0.95em;
}
.markdown-section table td {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
  background: var(--bg-card);
}
.markdown-section table tr:last-child td {
  border-bottom: none;
}
.markdown-section table tr:hover td {
  background: rgba(124, 92, 252, 0.05);
}

/* ═══════════════════════════════════════════
   引用块 / 图片 / 水平线
   ═══════════════════════════════════════════ */
.markdown-section blockquote {
  border-left: 4px solid var(--brand);
  background: rgba(124, 92, 252, 0.06);
  padding: 12px 20px;
  margin: 16px 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-secondary);
}
.markdown-section blockquote p {
  margin: 4px 0;
}

.markdown-section img {
  max-width: 100%;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  margin: 16px 0;
}

.markdown-section hr {
  border: none;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--brand), transparent);
  margin: 32px 0;
}

/* ═══════════════════════════════════════════
   提示块样式
   ═══════════════════════════════════════════ */
.markdown-section .tip,
.markdown-section .warn,
.markdown-section .danger {
  padding: 12px 16px;
  border-left: 4px solid;
  margin: 16px 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.markdown-section .tip {
  background: rgba(45, 125, 70, 0.1);
  border-color: #2d7d46;
}
.markdown-section .warn {
  background: rgba(217, 119, 6, 0.1);
  border-color: #d97706;
}
.markdown-section .danger {
  background: rgba(220, 38, 38, 0.1);
  border-color: #dc2626;
}

/* ═══════════════════════════════════════════
   Mermaid 图表
   ═══════════════════════════════════════════ */
.markdown-section .mermaid {
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  padding: 16px;
  margin: 16px 0;
  text-align: center;
  border: 1px solid var(--border);
}

/* ═══════════════════════════════════════════
   分页导航
   ═══════════════════════════════════════════ */
.docsify-pagination-container {
  border-top: 1px solid var(--border) !important;
  padding-top: 24px !important;
  margin-top: 32px !important;
}
.pagination-item-label {
  color: var(--text-muted) !important;
  font-size: 0.85em !important;
}
.pagination-item-title {
  color: var(--brand-light) !important;
}

/* ═══════════════════════════════════════════
   字数统计
   ═══════════════════════════════════════════ */
.count {
  color: var(--text-muted) !important;
  border-bottom: 1px solid var(--border) !important;
  padding-bottom: 4px !important;
  margin-bottom: 8px !important;
}

/* ============================================================
   固定工具栏（回到顶部 + 思维导图切换）
   ============================================================ */

.deer-toolbar {
  position: fixed;
  top: 16px;
  right: 24px;
  z-index: 9998;
  display: flex;
  gap: 8px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 28px;
  padding: 6px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.1);
}

.deer-tb-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid transparent;
  border-radius: 22px;
  padding: 8px 14px;
  font-size: 0.82em;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.25s ease;
  white-space: nowrap;
  outline: none;
}
.deer-tb-btn:hover {
  background: rgba(124, 92, 252, 0.1);
  color: var(--brand);
  border-color: rgba(124, 92, 252, 0.3);
}
.deer-tb-btn svg {
  flex-shrink: 0;
}
.deer-tb-btn.active {
  background: var(--brand);
  color: #fff;
  border-color: var(--brand);
  box-shadow: 0 0 12px rgba(124, 92, 252, 0.4);
}
.deer-tb-btn.active:hover {
  background: var(--brand-light);
}

/* ============================================================
   Mermaid 全屏遮罩
   ============================================================ */

.deer-fullscreen-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(255, 255, 255, 0.97);
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.deer-fs-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  border-bottom: 1px solid rgba(124, 92, 252, 0.15);
  background: rgba(248, 249, 250, 0.9);
  flex-shrink: 0;
}

.deer-fs-title {
  color: var(--text-primary);
  font-size: 0.95em;
  font-weight: 600;
  letter-spacing: 0.3px;
}

.deer-fs-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.deer-fs-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(124, 92, 252, 0.08);
  color: var(--text-secondary);
  border: 1px solid rgba(124, 92, 252, 0.15);
  border-radius: 6px;
  padding: 6px 12px;
  font-size: 0.8em;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s ease;
  outline: none;
  white-space: nowrap;
}
.deer-fs-btn:hover {
  background: rgba(124, 92, 252, 0.2);
  color: var(--brand);
  border-color: var(--brand);
}

.deer-fs-export {
  background: rgba(124, 92, 252, 0.15);
  font-weight: 600;
  letter-spacing: 0.3px;
}
.deer-fs-export:hover {
  background: var(--brand);
  color: #fff;
}

.deer-fs-close {
  margin-left: 4px;
  font-size: 1.1em;
  padding: 5px 12px;
}
.deer-fs-close:hover {
  background: rgba(220, 38, 38, 0.15);
  color: #dc2626;
  border-color: rgba(220, 38, 38, 0.4);
}

.deer-fs-sep {
  width: 1px;
  height: 20px;
  background: rgba(124, 92, 252, 0.15);
  margin: 0 4px;
}

.deer-fs-body {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: auto;
  padding: 32px;
}
.deer-fs-body svg {
  max-width: 100%;
  max-height: 100%;
  border-radius: 4px;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.15);
}

/* ============================================================
   Markmap 思维导图容器
   ============================================================ */

.deer-markmap-container {
  display: none;
  width: 100%;
  height: calc(100vh - 60px);
  min-height: 500px;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
  overflow: hidden;
}
.deer-markmap-container svg {
  cursor: grab;
}
.deer-markmap-container svg:active {
  cursor: grabbing;
}

.deer-markmap-loading,
.deer-markmap-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  color: var(--text-muted);
  font-size: 0.95em;
}

.deer-spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border);
  border-top-color: var(--brand);
  border-radius: 50%;
  animation: deer-spin 0.8s linear infinite;
}

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

/* markmap 节点样式适配 */
.deer-markmap-container .markmap-node .markmap-foreign {
  color: var(--text-primary);
}
.deer-markmap-container .markmap-link {
  stroke: rgba(124, 92, 252, 0.2);
}

/* ============================================================
   封面页
   ============================================================ */
.cover {
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 50%, #f4f4f8 100%) !important;
}
.cover-main h1 {
  font-size: 3.5em;
  background: linear-gradient(135deg, var(--brand), var(--brand-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
}
.cover-main .cover-button {
  background: var(--brand) !important;
  color: #fff !important;
  border: none !important;
  border-radius: var(--radius-sm) !important;
  padding: 12px 32px !important;
  font-size: 1.1em !important;
  transition: var(--transition);
}
.cover-main .cover-button:hover {
  background: var(--brand-light) !important;
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(124, 92, 252, 0.4);
}

/* ═══════════════════════════════════════════
   响应式适配
   ═══════════════════════════════════════════ */
@media (max-width: 768px) {
  :root {
    --sidebar-width: 260px;
  }
  .markdown-section {
    padding: 16px 24px;
  }
  .markdown-section h1 {
    font-size: 1.6em;
  }
  .deer-toolbar {
    top: 8px;
    right: 8px;
    gap: 4px;
    padding: 4px;
  }
  .deer-tb-btn {
    padding: 7px 12px;
    font-size: 0.75em;
    gap: 4px;
  }
  .deer-tb-btn span {
    display: none;
  }
  .deer-fs-header {
    padding: 8px 14px;
  }
  .deer-fs-actions {
    gap: 3px;
  }
  .deer-fs-btn {
    padding: 5px 8px;
    font-size: 0.72em;
  }
  .deer-fs-body {
    padding: 16px;
  }
}

@media (max-width: 480px) {
  .markdown-section {
    padding: 12px 16px;
  }
  .markdown-section table {
    font-size: 0.85em;
  }
  .markdown-section table th,
  .markdown-section table td {
    padding: 8px 10px;
  }
}

/* ═══════════════════════════════════════════
   打印样式
   ═══════════════════════════════════════════ */
@media print {
  .sidebar,
  .navbar,
  .deer-toolbar,
  .deer-fullscreen-overlay {
    display: none !important;
  }
  .content {
    left: 0 !important;
    max-width: 100% !important;
  }
}

/* ═══════════════════════════════════════════
   过渡动画
   ═══════════════════════════════════════════ */
.sidebar {
  transition: transform 0.25s ease;
}
.content {
  transition: left 0.25s ease;
}
.sidebar a,
.markdown-section a,
.markdown-section pre,
.markdown-section img {
  transition: var(--transition);
}