diff --git a/.gitignore b/.gitignore
index bb46c8d0..ec4c35ca 100644
--- a/.gitignore
+++ b/.gitignore
@@ -52,6 +52,7 @@ cache
 .cursor
 .trae
 .codex
+.sisyphus
 .pytest_cache
 
 *.secret*
diff --git a/web/src/components/common/MarkdownPreview.vue b/web/src/components/common/MarkdownPreview.vue
index 7c55cb81..c0091d85 100644
--- a/web/src/components/common/MarkdownPreview.vue
+++ b/web/src/components/common/MarkdownPreview.vue
@@ -6,6 +6,7 @@
       { 'is-dark': themeStore.isDark, 'is-compact': compact }
     ]"
     v-html="renderedMarkdown"
+    @click="handleSvgAction"
   ></div>
 </template>
 
@@ -48,6 +49,101 @@ watch(
   },
   { immediate: true }
 )
+
+// === SVG 操作按钮事件委托 ===
+const handleSvgAction = async (e) => {
+  const btn = e.target.closest('.svg-copy-btn, .svg-png-btn')
+  if (!btn) return
+
+  const container = btn.closest('.svg-inline-render')
+  const svgEl = container?.querySelector('svg')
+  if (!svgEl) return
+
+  if (btn.classList.contains('svg-copy-btn')) {
+    await copySvgText(svgEl, btn)
+  } else if (btn.classList.contains('svg-png-btn')) {
+    await copySvgAsPng(svgEl, btn)
+  }
+}
+
+// 复制 SVG 源代码
+const copySvgText = async (svgEl, btn) => {
+  try {
+    await navigator.clipboard.writeText(svgEl.outerHTML)
+    showCopiedFeedback(btn)
+  } catch (err) {
+    console.error('复制 SVG 失败:', err)
+  }
+}
+
+// 复制为 PNG 图片
+const copySvgAsPng = async (svgEl, btn) => {
+  const svgContent = svgEl.outerHTML
+  const blob = new Blob([svgContent], { type: 'image/svg+xml' })
+  const url = URL.createObjectURL(blob)
+
+  try {
+    // 三级递进尺寸策略：
+    // 1) viewBox 固有坐标尺寸（最佳品质，不受 CSS 缩放影响）
+    let width, height
+    const vb = svgEl.viewBox
+    if (vb && vb.baseVal && vb.baseVal.width && vb.baseVal.height) {
+      width = vb.baseVal.width
+      height = vb.baseVal.height
+    }
+
+    // 2) 客户端渲染尺寸（SVG 在 DOM 中一定可获取）
+    if (!width || !height) {
+      const rect = svgEl.getBoundingClientRect()
+      width = rect.width
+      height = rect.height
+    }
+
+    // 3) 回退
+    if (!width || !height) { width = 800; height = 600 }
+
+    const img = await new Promise((resolve, reject) => {
+      const image = new Image()
+      image.onload = () => resolve(image)
+      image.onerror = reject
+      image.src = url
+    })
+
+    const canvas = document.createElement('canvas')
+    canvas.width = width
+    canvas.height = height
+    const ctx = canvas.getContext('2d')
+    // 不填充背景色 — Canvas 默认为全透明
+    // 背景色由 SVG 自身决定
+    ctx.drawImage(img, 0, 0, width, height)
+
+    const pngBlob = await new Promise(resolve => canvas.toBlob(resolve, 'image/png'))
+    if (pngBlob) {
+      await navigator.clipboard.write([
+        new ClipboardItem({ 'image/png': pngBlob })
+      ])
+      showCopiedFeedback(btn)
+    }
+  } catch (err) {
+    console.error('复制为 PNG 失败:', err)
+    // fallback: 尝试复制 SVG 源码
+    try {
+      await navigator.clipboard.writeText(svgContent)
+      console.log('PNG 复制失败，已回退复制 SVG 源码')
+    } catch {}
+  } finally {
+    URL.revokeObjectURL(url)
+  }
+}
+
+// 反馈：按钮文字短暂变为「已复制」
+const showCopiedFeedback = (btn) => {
+  const originalText = btn.textContent
+  btn.textContent = '已复制'
+  setTimeout(() => {
+    btn.textContent = originalText
+  }, 1500)
+}
 </script>
 
 <style lang="less">
@@ -334,5 +430,68 @@ watch(
     font-size: 12px;
     line-height: 1.5;
   }
+
+  .svg-inline-render {
+    position: relative;
+    max-width: 100%;
+    height: auto;
+    overflow: auto;
+    margin: 12px 0;
+
+    svg {
+      max-width: 100%;
+      height: auto;
+    }
+
+    .svg-actions {
+      position: absolute;
+      top: 8px;
+      right: 8px;
+      z-index: 10;
+      display: none;
+      gap: 4px;
+
+      .svg-action-btn {
+        display: inline-flex;
+        align-items: center;
+        padding: 3px 8px;
+        border: 1px solid var(--gray-200);
+        border-radius: 4px;
+        background: var(--gray-0);
+        color: var(--gray-700);
+        font-size: 12px;
+        line-height: 1.5;
+        cursor: pointer;
+        transition: all 0.15s ease;
+        white-space: nowrap;
+        user-select: none;
+
+        &:hover {
+          background: var(--gray-100);
+          color: var(--gray-900);
+        }
+      }
+    }
+
+    &:hover .svg-actions {
+      display: inline-flex;
+    }
+  }
+
+  &.is-dark .svg-inline-render {
+    background: rgba(255, 255, 255, 0.03);
+    border-radius: 4px;
+  }
+
+  &.is-dark .svg-actions .svg-action-btn {
+    background: rgba(255, 255, 255, 0.08);
+    border-color: rgba(255, 255, 255, 0.12);
+    color: var(--gray-300);
+
+    &:hover {
+      background: rgba(255, 255, 255, 0.15);
+      color: var(--gray-100);
+    }
+  }
 }
 </style>
diff --git a/web/src/utils/__tests__/svgRenderer.test.js b/web/src/utils/__tests__/svgRenderer.test.js
new file mode 100644
index 00000000..4c0fe878
--- /dev/null
+++ b/web/src/utils/__tests__/svgRenderer.test.js
@@ -0,0 +1,165 @@
+import assert from 'node:assert/strict'
+import { renderSvgBlocks } from '../svgRenderer.js'
+
+const run = () => {
+  // 1. Basic backtick fence
+  {
+    const result = renderSvgBlocks('before\n```svg\n<svg><circle/></svg>\n```\nafter')
+    assert.ok(result.includes('svg-inline-render'), 'Should contain svg-inline-render wrapper')
+    assert.ok(result.includes('<svg>'), 'Should contain SVG tag')
+    assert.ok(!result.includes('```svg'), 'Should NOT contain raw fence marker')
+    assert.ok(result.includes('before'), 'Should preserve content before block')
+    assert.ok(result.includes('after'), 'Should preserve content after block')
+    // 按钮存在
+    assert.ok(result.includes('svg-actions'), 'Should contain svg-actions wrapper')
+    assert.ok(result.includes('svg-copy-btn'), 'Should contain copy button')
+    assert.ok(result.includes('svg-png-btn'), 'Should contain PNG button')
+    assert.ok(result.includes('复制 SVG'), 'Should contain copy text')
+    assert.ok(result.includes('复制为 PNG'), 'Should contain PNG text')
+    console.log('T1 Basic backtick fence: PASS')
+  }
+
+  // 2. Tilde fence
+  {
+    const result = renderSvgBlocks('~~~svg\n<svg><rect/></svg>\n~~~')
+    assert.ok(result.includes('svg-inline-render'), 'Tilde fence should be converted')
+    assert.ok(result.includes('<rect/>'), 'Should contain SVG content')
+    console.log('T2 Tilde fence: PASS')
+  }
+
+  // 3. SVG with blank lines (compressed to single line)
+  {
+    const result = renderSvgBlocks(
+      '```svg\n<svg>\n<defs>\n<linearGradient id="g">\n<stop offset="0%"/>\n\n<stop offset="100%"/>\n</linearGradient>\n</defs>\n</svg>\n```'
+    )
+    const lines = result.split('\n')
+    assert.equal(lines.length, 1, 'Should be compressed to single line')
+    assert.ok(result.includes('svg-inline-render'), 'Should contain wrapper')
+    assert.ok(result.includes('<stop offset="0%"/><stop offset="100%"/>'), 'Blank lines should be removed between tags')
+    assert.ok(result.includes('svg-copy-btn'), 'Buttons should be inside single-line output')
+    console.log('T3 Blank lines compressed: PASS')
+  }
+
+  // 4. Case insensitive (SVG / Svg / sVG)
+  {
+    const result = renderSvgBlocks('```SVG\n<svg/>\n```')
+    assert.ok(result.includes('svg-inline-render'), 'Uppercase SVG should be matched')
+    console.log('T4 Case insensitive: PASS')
+  }
+
+  // 5. Incomplete block (streaming safety)
+  {
+    const result = renderSvgBlocks('before\n```svg\n<svg>')
+    assert.ok(result.includes('```svg'), 'Incomplete block should keep raw fence')
+    assert.ok(!result.includes('svg-inline-render'), 'Incomplete block should NOT be converted')
+    assert.ok(result.includes('before'), 'Should preserve content before')
+    console.log('T5 Incomplete block (streaming safety): PASS')
+  }
+
+  // 6. Non-SVG code block unchanged
+  {
+    const result = renderSvgBlocks('```python\nprint(1)\n```')
+    assert.ok(result.includes('```python'), 'Python fence should be preserved')
+    assert.ok(result.includes('```'), 'Closing fence should be preserved')
+    assert.ok(!result.includes('svg-inline-render'), 'Non-SVG block should NOT be converted')
+    console.log('T6 Non-SVG code block unchanged: PASS')
+  }
+
+  // 7. Multiple consecutive SVG blocks
+  {
+    const result = renderSvgBlocks('```svg\n<svg id="1"/>\n```\ntext\n```svg\n<svg id="2"/>\n```')
+    const matches = result.match(/svg-inline-render/g)
+    assert.equal(matches ? matches.length : 0, 2, 'Should convert both SVG blocks')
+    const btnMatches = result.match(/svg-copy-btn/g)
+    assert.equal(btnMatches ? btnMatches.length : 0, 2, 'Each SVG block should have buttons')
+    assert.ok(result.includes('text'), 'Should preserve text between blocks')
+    console.log('T7 Multiple SVG blocks: PASS')
+  }
+
+  // 8. Empty SVG code block
+  {
+    const result = renderSvgBlocks('```svg\n```')
+    assert.ok(result.includes('svg-inline-render'), 'Empty SVG block should still be converted')
+    console.log('T8 Empty SVG block: PASS')
+  }
+
+  // 9. No SVG blocks (identity transformation)
+  {
+    const result = renderSvgBlocks('hello world\n\nsome text')
+    assert.equal(result, 'hello world\n\nsome text', 'Should be identity when no SVG blocks')
+    console.log('T9 Identity (no SVG blocks): PASS')
+  }
+
+  // 10. SVG content with backticks inside
+  {
+    const result = renderSvgBlocks('```svg\n<svg><title>`code`</title></svg>\n```')
+    assert.ok(result.includes('svg-inline-render'), 'Should convert SVG with backticks in content')
+    assert.ok(result.includes('`code`'), 'Should preserve backticks inside SVG content')
+    console.log('T10 Backticks in SVG content: PASS')
+  }
+
+  // 11. Fence with attributes on opening line
+  {
+    const result = renderSvgBlocks('```svg id="mySvg"\n<svg/>\n```')
+    assert.ok(result.includes('svg-inline-render'), 'Fence with attributes should be converted')
+    console.log('T11 Fence with attributes: PASS')
+  }
+
+  // 12. SVG block at start of content
+  {
+    const result = renderSvgBlocks('```svg\n<svg/>\n```\n\nsome text after')
+    assert.ok(result.includes('svg-inline-render'), 'SVG at start should be converted')
+    assert.ok(result.includes('some text after'), 'Should preserve text after')
+    console.log('T12 SVG at start: PASS')
+  }
+
+  // 13. SVG block at end of content
+  {
+    const result = renderSvgBlocks('some text before\n\n```svg\n<svg/>\n```')
+    assert.ok(result.includes('svg-inline-render'), 'SVG at end should be converted')
+    assert.ok(result.includes('some text before'), 'Should preserve text before')
+    console.log('T13 SVG at end: PASS')
+  }
+
+  // 14. Multiple non-consecutive SVG blocks with other content
+  {
+    const result = renderSvgBlocks(
+      '# Title\n\n```svg\n<svg id="a"/>\n```\n\nSome text\n\n```svg\n<svg id="b"/>\n```\n\n# End'
+    )
+    const matches = result.match(/svg-inline-render/g)
+    assert.equal(matches ? matches.length : 0, 2, 'Should convert both non-consecutive SVG blocks')
+    assert.ok(result.includes('# Title'), 'Should preserve markdown headings')
+    assert.ok(result.includes('Some text'), 'Should preserve text between blocks')
+    assert.ok(result.includes('# End'), 'Should preserve trailing content')
+    console.log('T14 Non-consecutive SVG blocks: PASS')
+  }
+
+  // 15. SVG content with HTML comments
+  {
+    const result = renderSvgBlocks('```svg\n<svg><!-- comment --><circle/></svg>\n```')
+    assert.ok(result.includes('svg-inline-render'), 'SVG with HTML comments should be converted')
+    assert.ok(result.includes('svg-copy-btn'), 'Buttons should be present')
+    assert.ok(result.includes('<!-- comment -->'), 'Should preserve HTML comments')
+    console.log('T15 SVG with HTML comments: PASS')
+  }
+
+  // 16. Action buttons are present in complete SVG blocks
+  {
+    const result = renderSvgBlocks('```svg\n<svg viewBox="0 0 100 50"><circle/></svg>\n```')
+    assert.ok(result.includes('svg-actions'), 'Should contain svg-actions wrapper')
+    assert.ok(result.includes('svg-copy-btn'), 'Should contain copy button')
+    assert.ok(result.includes('svg-png-btn'), 'Should contain PNG button')
+    assert.ok(result.includes('type="button"'), 'Buttons should have type="button"')
+    assert.ok(result.includes('复制 SVG'), 'Copy button should have Chinese label')
+    assert.ok(result.includes('复制为 PNG'), 'PNG button should have Chinese label')
+    // 按钮在 svg 之前（渲染层在上方）
+    const actionsIdx = result.indexOf('svg-actions')
+    const svgIdx = result.indexOf('<svg ')
+    assert.ok(actionsIdx < svgIdx, 'Buttons wrapper should appear before SVG element')
+    console.log('T16 Action buttons structure: PASS')
+  }
+
+  console.log('\nAll 16 tests passed!')
+}
+
+run()
\ No newline at end of file
diff --git a/web/src/utils/markdown_preview.js b/web/src/utils/markdown_preview.js
index e80e829a..c06fbd7c 100644
--- a/web/src/utils/markdown_preview.js
+++ b/web/src/utils/markdown_preview.js
@@ -6,6 +6,7 @@ import { createHighlighter } from 'shiki'
 import yaml from 'js-yaml'
 import { escapeHtml } from '@/utils/html'
 import { normalizeCodeLanguage } from '@/utils/file_preview'
+import { renderSvgBlocks } from './svgRenderer'
 
 const markdownKatexPlugin = markdownItKatex.default || markdownItKatex
 const FRONTMATTER_MARKER = '---'
@@ -198,19 +199,20 @@ const setCachedHtml = (cacheKey, html) => {
 export const renderMarkdown = async (content, { theme = 'github-light' } = {}) => {
   try {
     const normalizedContent = normalizeHtmlTagQuotes(content)
+    const svgContent = renderSvgBlocks(normalizedContent)
     const themeName = normalizeTheme(theme)
-    const needsHighlight = hasCodeFence(normalizedContent)
-    const cacheKey = `${needsHighlight ? themeName : 'plain'}\u0000${normalizedContent}`
+    const needsHighlight = hasCodeFence(svgContent)
+    const cacheKey = `${needsHighlight ? themeName : 'plain'}\u0000${svgContent}`
     const cachedHtml = getCachedHtml(cacheKey)
     if (cachedHtml !== undefined) return cachedHtml
 
     if (needsHighlight) {
       const highlighter = await getHighlighter()
-      await ensureLanguages(highlighter, collectCodeFenceLanguages(normalizedContent))
+      await ensureLanguages(highlighter, collectCodeFenceLanguages(svgContent))
     }
 
     const md = await getRenderer(themeName, needsHighlight)
-    const html = DOMPurify.sanitize(md.render(normalizedContent), {
+    const html = DOMPurify.sanitize(md.render(svgContent), {
       ADD_TAGS: ['input'],
       ADD_ATTR: [
         'class',
diff --git a/web/src/utils/svgRenderer.js b/web/src/utils/svgRenderer.js
new file mode 100644
index 00000000..3b0ac6c6
--- /dev/null
+++ b/web/src/utils/svgRenderer.js
@@ -0,0 +1,73 @@
+/**
+ * SVG 渲染工具函数
+ * 将 Markdown 中的 ```svg 围栏代码块转换为内联 SVG HTML
+ */
+
+/**
+ * 将 Markdown 字符串中的 ```svg 围栏代码块转换为内联 SVG HTML
+ *
+ * 使用逐行扫描算法而非单一大正则，以避免嵌套围栏和内容中反引号的误匹配。
+ * SVG 内容会被压缩为单行，防止 markdown-it HTML 块解析因空白行截断内容。
+ *
+ * @param {string} markdown - 原始 Markdown 字符串
+ * @returns {string} 转换后的字符串，SVG 围栏被替换为 <div class="svg-inline-render"><svg>...</svg></div>
+ */
+export function renderSvgBlocks(markdown) {
+  const lines = markdown.split('\n')
+  const output = []
+  let i = 0
+
+  while (i < lines.length) {
+    const openMatch = lines[i].match(/^( {0,3})(`{3,}|~{3,})\s*(\S*)/)
+
+    if (openMatch && openMatch[3].toLowerCase() === 'svg') {
+      const indent = openMatch[1]
+      const fenceChar = openMatch[2]
+      const openLine = lines[i]
+      const svgLines = []
+      i++
+
+      // 扫描闭合围栏
+      let closed = false
+      while (i < lines.length) {
+        const closeMatch = lines[i].match(/^( {0,3})(`{3,}|~{3,})\s*$/)
+        if (
+          closeMatch
+          && closeMatch[1].length <= indent.length
+          && closeMatch[2][0] === fenceChar[0]
+          && closeMatch[2].length >= fenceChar.length
+        ) {
+          closed = true
+          // 压缩 SVG 为单行，防止 markdown-it HTML 块解析截断
+          const singleLine = svgLines
+            .join('')
+            .replace(/>\s+</g, '><')
+            .replace(/\s{2,}/g, ' ')
+            .trim()
+          const actionsHtml = [
+            `<div class="svg-actions">`,
+            `<button class="svg-action-btn svg-copy-btn" type="button">复制 SVG</button>`,
+            `<button class="svg-action-btn svg-png-btn" type="button">复制为 PNG</button>`,
+            `</div>`
+          ].join('')
+          output.push(`<div class="svg-inline-render">${actionsHtml}${singleLine}</div>`)
+          i++
+          break
+        }
+        svgLines.push(lines[i])
+        i++
+      }
+
+      if (!closed) {
+        // 未闭合的围栏 — 保持原样（流式安全）
+        output.push(openLine)
+        output.push(...svgLines)
+      }
+    } else {
+      output.push(lines[i])
+      i++
+    }
+  }
+
+  return output.join('\n')
+}
\ No newline at end of file