/* 通用字体和布局 */
.markdown-content {
  font-family: "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  margin: 0 auto;
  padding: 20px;
}

/* 标题 */
.markdown-content h1,
.markdown-content h2,
.markdown-content h3,
.markdown-content h4,
.markdown-content h5,
.markdown-content h6 {
  font-weight: 600;
  margin: 1.2em 0 0.6em;
  line-height: 1.3;
  color: #222;
}

.markdown-content h1 { font-size: 2.2em; border-bottom: 2px solid #eee; padding-bottom: 0.3em; color: #1a73e8; }
.markdown-content h2 { font-size: 1.8em; border-bottom: 1px solid #eee; padding-bottom: 0.2em; color: #1a73e8; }
.markdown-content h3 { font-size: 1.4em; }
.markdown-content h4 { font-size: 1.2em; }
.markdown-content h5 { font-size: 1em; }
.markdown-content h6 { font-size: 0.9em; color: #666; }

/* 段落 */
.markdown-content p {
  margin: 0.8em 0;
}

/* 链接 */
.markdown-content a {
  color: #1a73e8;
  text-decoration: none;
  transition: all 0.2s;
}
.markdown-content a:hover {
  text-decoration: underline;
}

/* 列表 */
.markdown-content ul
{
  margin: 0.8em 0 0.8em 1.5em;
  list-style: disc;
}
.markdown-content ol {
  margin: 0.8em 0 0.8em 1.5em;
  list-style: decimal;
}

.markdown-content li {
  margin: 0.3em 0;
}

/* 代码块 */
.markdown-content pre {
  background: #f6f8fa;
  border: 1px solid #e1e4e8;
  padding: 1em;
  border-radius: 6px;
  overflow-x: auto;
  margin: 1em 0;
}

.markdown-content code {
  background: #f6f8fa;
  border-radius: 4px;
  padding: 0.2em 0.4em;
  font-family: "Fira Code", monospace;
  font-size: 0.95em;
}

/* 块引用 */
.markdown-content blockquote {
  border-left: 4px solid #ddd;
  padding-left: 1em;
  color: #555;
  margin: 1em 0;
  font-style: italic;
  background: #f9f9f9;
}

/* 分隔线 */
.markdown-content hr {
  border: none;
  border-top: 1px solid #eee;
  margin: 2em 0;
}

/* 表格 */
.markdown-content table {
  border-collapse: collapse;
  width: 100%;
  margin: 1em 0;
}

.markdown-content th,
.markdown-content td {
  border: 1px solid #ddd;
  padding: 0.6em 1em;
  text-align: left;
}

.markdown-content th {
  background: #f6f8fa;
  font-weight: 600;
}

.markdown-content h1 {
  position: relative;       /* 为伪元素定位 */
  padding-left: 20px;       /* 为左侧矩形留出空间 */
}

.markdown-content h1::before {
  content: "";              /* 必须设置 content */
  position: absolute;
  left: 0;                  /* 左侧对齐 */
  top: 0;                   /* 从顶部开始 */
  width: 6px;               /* 矩形宽度 */
  height: 1.2em;             /* 高度和 h1 一样 */
  background-color: #4CAF50; /* 绿色 */
  border-radius:3px;       /* 可选，圆角效果 */
}