/* 主题变量定义 */
:root {
  /* 默认浅色主题 */
  --bg-color: #ffffff;
  --text-color: #333333;
  --link-color: #006239;
  --border-color: #e1e4e8;
  --border-dash-color: #e1e4e8;
  --code-bg: #f6f8fa;
  --code-text: #006239;
  --pre-bg: #fafafa;
  --pre-code-text: #383a42;
  --pre-lang-color: #a0a1a7;
  --blockquote-bg: #e7fde9;
  --blockquote-border: #00804a;
  --table-th-bg: #f6f8fa;
  --mermaid-container-bg: #ffffff;
  --mermaid-toolbar-bg: #f6f8fa;
  --mermaid-toolbar-text: #586069;
  --mermaid-chart-bg: #ffffff;
  --copy-btn-bg: #f6f8fa;
  --copy-btn-border: #e1e4e8;
  --copy-btn-text: #586069;
  --copy-btn-hover-bg: #10b981;
  --copy-btn-hover-border: #10b981;
  --math-bg: rgba(0, 0, 0, 0.02);
  --scrollbar-track-bg: rgba(0, 0, 0, 0.05);
  --scrollbar-thumb-bg: rgba(0, 0, 0, 0.2);
  --scrollbar-thumb-hover: rgba(0, 0, 0, 0.3);
  
  /* 语法高亮 - 浅色 */
  --token-comment: #a0a1a7;
  --token-string: #50a14f;
  --token-keyword: #a626a4;
  --token-number: #986801;
  --token-function: #4078f2;
  --token-operator: #383a42;
  --token-property: #e45649;
  --token-selector: #50a14f;
  --token-variable: #e45649;
}

/* 深色主题 */
html[data-theme="dark"] {
  --bg-color: #1a1a1a;
  --text-color: #ffffff;
  --link-color: #4a90e2;
  --border-color: #444444;
  --border-dash-color: #444444;
  --code-bg: #333333;
  --code-text: #4a90e2;
  --pre-bg: #282c34;
  --pre-code-text: #abb2bf;
  --pre-lang-color: #6c6f7e;
  --blockquote-bg: #031b05;
  --blockquote-border: #00804a;
  --table-th-bg: #333333;
  --mermaid-container-bg: #2a2a2a;
  --mermaid-toolbar-bg: #333333;
  --mermaid-toolbar-text: #cccccc;
  --mermaid-chart-bg: #2a2a2a;
  --copy-btn-bg: #333333;
  --copy-btn-border: #444444;
  --copy-btn-text: #cccccc;
  --copy-btn-hover-bg: #047857;
  --copy-btn-hover-border: #047857;
  --math-bg: rgba(255, 255, 255, 0.05);
  --scrollbar-track-bg: rgba(255, 255, 255, 0.05);
  --scrollbar-thumb-bg: rgba(255, 255, 255, 0.2);
  --scrollbar-thumb-hover: rgba(255, 255, 255, 0.3);
  
  /* 语法高亮 - 深色 */
  --token-comment: #7f848e;
  --token-string: #98c379;
  --token-keyword: #c678dd;
  --token-number: #d19a66;
  --token-function: #61afef;
  --token-operator: #abb2bf;
  --token-property: #e06c75;
  --token-selector: #98c379;
  --token-variable: #e06c75;
}

/* 基础样式 */
* {
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  max-width: 900px;
  margin: 0 auto;
  padding: 40px 20px;
  background: var(--bg-color);
  transition: all 0.3s ease;
}

a {
  color: var(--link-color);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: all 0.2s ease;
}

a:hover {
  border-bottom-color: var(--link-color);
}

h1, h2, h3, h4, h5, h6 { 
  margin-top: 24px; 
  margin-bottom: 16px; 
  font-weight: 600;
}

h1 { 
  font-size: 2.25em;
  padding-bottom: 16px; 
}

h2 { 
  font-size: 1.5em; 
  border-bottom: 1px dashed var(--border-dash-color); 
  padding-bottom: 16px; 
  padding-top: 24px;
}

h3 {
  font-size: 1.25em;
  padding-bottom: 8px;
  padding-top: 16px;
}

h4 {
  font-size: 1em;
}

h5 {
  font-size: 0.875em;
}

h6 {
  font-size: 0.85em;
}

p { 
  margin-bottom: 16px; 
}

code { 
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 3px;
  font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
  font-size: 0.9em;
  color: var(--code-text);
}

pre { 
  background: var(--pre-bg);
  padding: 0;
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  position: relative;
}

pre::before {
  content: attr(data-language);
  position: absolute;
  top: 2px;
  right: 12px;
  font-size: 11px;
  color: var(--pre-lang-color);
  text-transform: uppercase;
  font-weight: 600;
  letter-spacing: 0.5px;
  opacity: 0.6;
  z-index: 2;
  pointer-events: none;
}

pre code {
  background: none;
  padding: 16px;
  padding-top: 20px;
  display: block;
  line-height: 1.6;
  color: var(--pre-code-text);
  white-space: pre-wrap !important;
  word-wrap: break-word !important;
  word-break: break-all !important;
  overflow-wrap: break-word !important;
}

/* Prism.js 语法高亮样式 */
.token.comment,
.token.prolog,
.token.doctype,
.token.cdata {
  color: var(--token-comment) !important;
  font-style: italic;
}

.token.string,
.token.attr-value {
  color: var(--token-string) !important;
}

.token.keyword,
.token.builtin,
.token.class-name {
  color: var(--token-keyword) !important;
  font-weight: 600;
}

.token.number,
.token.boolean {
  color: var(--token-number) !important;
}

.token.function {
  color: var(--token-function) !important;
}

.token.operator,
.token.punctuation {
  color: var(--token-operator) !important;
}

.token.property,
.token.tag,
.token.constant,
.token.symbol,
.token.deleted {
  color: var(--token-property) !important;
}

.token.selector,
.token.attr-name,
.token.char,
.token.builtin,
.token.inserted {
  color: var(--token-selector) !important;
}

.token.variable {
  color: var(--token-variable) !important;
}

.token.important,
.token.bold {
  font-weight: bold;
}

.token.italic {
  font-style: italic;
}

.token.entity {
  cursor: help;
}

blockquote {
  padding: 6px 12px;
  margin: 16px 0;
  color: var(--text-color);
  border-radius: 6px;
  background-color: var(--blockquote-bg);
  border: 1px solid var(--border-color);
  border-left: 6px solid var(--blockquote-border);
}

table { 
  border-collapse: collapse; 
  width: 100%; 
  margin: 16px 0;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  overflow: hidden;
}

th, td { 
  border: 1px solid var(--border-color); 
  padding: 12px 16px; 
  text-align: left; 
  color: var(--text-color);
}

th { 
  background: var(--table-th-bg); 
  font-weight: 600;
  color: var(--text-color);
}

img { 
  max-width: 100%; 
  height: auto; 
  border-radius: 6px;
  margin: 16px 0;
}

ul, ol { 
  padding-left: 24px; 
  margin: 16px 0; 
}

li { margin: 4px 0; }

/* Mermaid 图表样式 */
.mermaid-chart-container {
  margin: 20px 0;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--mermaid-container-bg);
  overflow: hidden;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.mermaid-chart-toolbar {
  display: flex !important;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  background: var(--mermaid-toolbar-bg);
  border-bottom: 1px solid var(--border-color);
  font-size: 12px;
  color: var(--mermaid-toolbar-text);
}

.chart-type-label {
  display: block !important;
  font-weight: 600;
}

.mermaid-chart {
  padding: 20px;
  text-align: center;
  background: var(--mermaid-chart-bg);
  min-height: 150px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: visible;
  margin: 0;
}

.mermaid-chart svg {
  max-width: 100%;
  height: auto;
}

.mermaid-chart img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;  /* 图片居中 */
}

/* 任务列表样式 */
.task-list-item {
  list-style: none;
  margin-left: -24px;
  padding-left: 24px;
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-bottom: 8px;
}

.task-list-item input[type="checkbox"] {
  margin-top: 3px;
  margin-right: 8px;
}

/* 代码块复制按钮 */
.code-copy-btn {
  position: absolute;
  bottom: 8px;
  right: 12px;
  padding: 4px 8px;
  background: var(--copy-btn-bg);
  border: 1px solid var(--copy-btn-border);
  border-radius: 4px;
  color: var(--copy-btn-text);
  font-size: 12px;
  cursor: pointer;
  opacity: 0;
  transition: all 0.2s ease;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 4px;
}

pre:hover .code-copy-btn {
  opacity: 1;
}

.code-copy-btn:hover {
  background: var(--copy-btn-hover-bg);
  color: white;
  border: 1px solid var(--copy-btn-hover-border);
}

.code-copy-btn:active {
  transform: scale(0.95);
}

.code-copy-btn.copied {
  background: var(--copy-btn-hover-bg);
  color: white;
  border: 1px solid var(--copy-btn-hover-border);
}

.code-copy-btn svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

/* ✨ LaTeX 公式样式优化 */
/* 隐藏公式编号 */
.katex-display::after,
.katex-display .tag,
.katex-display .eqn-num,
.katex .tag {
  display: none !important;
}

/* 公式容器宽度限制 */
.math-block {
  max-width: 100% !important;
  width: 100% !important;
  overflow-x: auto !important;
  overflow-y: hidden !important;
  box-sizing: border-box !important;
  margin: 1.5em 0 !important;
  padding: 1em !important;
  border-radius: 6px !important;
  background: var(--math-bg) !important;
}

/* KaTeX 显示块宽度限制 */
.katex-display {
  max-width: 100% !important;
  width: 100% !important;
  overflow-x: auto !important;
  overflow-y: hidden !important;
  box-sizing: border-box !important;
  display: block !important;
  margin: 1em 0 !important;
  text-align: center !important;
  padding: 0.5em 0 !important;
}

/* KaTeX 内部容器 */
.katex-display > .katex {
  max-width: 100% !important;
  display: inline-block !important;
  text-align: center !important;
}

/* 行内公式 */
.katex {
  font-size: 1.1em !important;
  max-width: 100% !important;
}

/* 防止公式溢出 - 添加滚动条 */
.katex-display::-webkit-scrollbar {
  height: 6px;
}

.katex-display::-webkit-scrollbar-track {
  background: var(--scrollbar-track-bg);
  border-radius: 3px;
}

.katex-display::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb-bg);
  border-radius: 3px;
}

.katex-display::-webkit-scrollbar-thumb:hover {
  background: var(--scrollbar-thumb-hover);
}

/* 主题切换按钮 */
.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  padding: 8px 12px;
  background: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-color);
  cursor: pointer;
  font-size: 14px;
  transition: all 0.3s ease;
  z-index: 1000;
  display: flex;
  align-items: center;
  gap: 6px;
}

.theme-toggle:hover {
  transform: scale(1.05);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
}

/* 响应式调整 */
@media (max-width: 600px) {
  .theme-toggle {
    top: 10px;
    right: 10px;
    padding: 6px 8px;
    font-size: 12px;
  }
  
  body {
    padding: 50px 15px 20px 15px;
  }
}