diff --git a/.workbuddy/memory/2026-08-14.md b/.workbuddy/memory/2026-08-14.md
index e8b4cf5..2b9a389 100644
--- a/.workbuddy/memory/2026-08-14.md
+++ b/.workbuddy/memory/2026-08-14.md
@@ -11,3 +11,14 @@
 - **根因**：偶数 set 数时 `sets×hold/2` 正好落在某组练完→休息切换的那一 tick。`_circuitCue` 先播 halfway 并设 `_voiceBusyUntil=now+2600` 占麦；紧接着 `_advance()`→`_circuitPhase('resting')` 检查麦占用，`restStart` 被静音。原代码注释有意让"进度提示优先于阶段提示"，但偶数组数下两者撞车。
 - **修复**：`_circuitCue` 里先算 `atRestBoundary`(phaseRemaining<=0 && rest>0 && setIndex<sets) 与 `restWillSpeak`(hold>=10 && rest>=5)；halfway/last30/last10 在"落在休息边界且 restStart 会播"时跳过自身，让休息语音优先。奇数组数一半点在中段不会撞车，不动；短组配置 rest 不播也保持原 halfway 行为，无回归。改 `pages/timer/timer.js` 的 `_circuitCue`。
 - 顺带：last30/last10 在更长偶数组数(如 4 组×30s 的 set3→rest)也会撞同一问题，一并按同规则让位，行为一致。
+
+## 新增：训练完成分享海报（canvas 绘制 + 小程序码）
+- **现象**：训练完成后点分享，微信默认截取当前页面，因完成弹窗垂直居中，卡片只截到上半部分（绿色星星+"完成!"），大数字和按钮被切掉。
+- **方案**：用隐藏 canvas 2d 绘制一张 5:4（500×400 逻辑像素）的专用分享海报，在 `onShareAppMessage` 里作为 `imageUrl` 返回；提前在 `_saveAndShowCompletion` 弹窗数据就绪后生成，避免分享时现场绘制延迟。
+- **海报内容**：浅灰底 + 顶部品牌 + 白色圆角成绩卡 + 绿色渐变星星图标 + 状态文案 + 大数字时长 + 连续打卡（如有）+ 底部"扫码一起打卡"引导 + 右下角小程序二维码。
+- **文件改动**：
+  - `pages/timer/timer.wxml`：添加隐藏 `<canvas type="2d" id="sharePoster">`
+  - `pages/timer/timer.wxss`：`.share-poster-canvas` 移出视口、不响应点击
+  - `pages/timer/timer.js`：新增 `_drawSharePoster()`、`_formatShareDuration()`；`_saveAndShowCompletion()` 里 setData 后预生成；`onShareAppMessage()` 返回 `imageUrl: this._shareImageUrl`；`onTrainAgain()` 清空旧图防止复用
+  - `static/share-qr.jpg`：加入用户提供的小程序二维码资源
+- **注意**：导出用 jpg quality 0.9、dest 500×400，控制文件在 128KB 以内；二维码路径 `/static/share-qr.jpg` 为相对小程序根目录；若二维码加载失败仍导出无二维码的海报，保证分享入口不灰。
diff --git a/pages/timer/timer.js b/pages/timer/timer.js
index cb6ce31..871cbb2 100644
--- a/pages/timer/timer.js
+++ b/pages/timer/timer.js
@@ -846,6 +846,9 @@ Page({
       completionTipRisk: scienceTip.risk
     })
 
+    // 预生成分享海报,点"分享"时 onShareAppMessage 直接复用,避免现场绘制延迟
+    this._drawSharePoster()
+
     // Animate the big number from 0 to elapsed
     if (this._completionCountUp) this._completionCountUp.cancel()
     this._completionCountUp = countUp({
@@ -928,6 +931,8 @@ Page({
       this._completionCountUp.cancel()
       this._completionCountUp = null
     }
+    // 清空上一轮分享图,避免"再来一次"后立即分享时复用旧图
+    this._shareImageUrl = ''
     // Circuit mode: rebuild the FSM (start() only resets from idle, and a
     // finished/paused timer is no longer idle, so a fresh init is the clean
     // reset; _initCircuit also closes the completion modal).
@@ -969,6 +974,201 @@ Page({
   // taps on the completion modal).
   onNoop() { /* swallow */ },
 
+  /**
+   * 绘制训练完成分享海报并导出为临时图片。
+   * 在 _saveAndShowCompletion 里弹窗数据就绪后调用,提前生成,
+   * 用户点"分享"时 onShareAppMessage 直接取 _shareImageUrl。
+   */
+  _drawSharePoster() {
+    const query = wx.createSelectorQuery().in(this)
+    query.select('#sharePoster')
+      .fields({ node: true, size: true })
+      .exec((res) => {
+        if (!res || !res[0] || !res[0].node) return
+        const canvas = res[0].node
+        const ctx = canvas.getContext('2d')
+        const dpr = wx.getSystemInfoSync().pixelRatio || 1
+        // 5:4 比例,控制导出文件<128KB;画布逻辑像素 500x400,实际按 dpr 放大
+        const W = 500
+        const H = 400
+        canvas.width = W * dpr
+        canvas.height = H * dpr
+        ctx.scale(dpr, dpr)
+        ctx.clearRect(0, 0, W, H)
+
+        const theme = this.data.theme || themeMod.getCurrentTheme()
+        const primary = theme.primary || '#FF6B35'
+
+        // 与完成弹窗视觉一致的成绩数据
+        const elapsed = this.data.completionActualElapsed || this.data.completionElapsed || 0
+        const streak = this.data.completionStreak || 0
+        const message = this.data.completionMessage || '完成!'
+
+        // helpers
+        const roundRect = (x, y, w, h, r) => {
+          const rr = Math.min(r, w / 2, h / 2)
+          ctx.beginPath()
+          ctx.moveTo(x + rr, y)
+          ctx.lineTo(x + w - rr, y)
+          ctx.quadraticCurveTo(x + w, y, x + w, y + rr)
+          ctx.lineTo(x + w, y + h - rr)
+          ctx.quadraticCurveTo(x + w, y + h, x + w - rr, y + h)
+          ctx.lineTo(x + rr, y + h)
+          ctx.quadraticCurveTo(x, y + h, x, y + h - rr)
+          ctx.lineTo(x, y + rr)
+          ctx.quadraticCurveTo(x, y, x + rr, y)
+          ctx.closePath()
+        }
+
+        const drawStar = (cx, cy, outerR, innerR, points) => {
+          ctx.beginPath()
+          for (let i = 0; i < points * 2; i++) {
+            const r = i % 2 === 0 ? outerR : innerR
+            const a = (Math.PI / points) * i - Math.PI / 2
+            const x = cx + Math.cos(a) * r
+            const y = cy + Math.sin(a) * r
+            if (i === 0) ctx.moveTo(x, y)
+            else ctx.lineTo(x, y)
+          }
+          ctx.closePath()
+        }
+
+        // --- background ---
+        ctx.fillStyle = '#F7F8FA'
+        ctx.fillRect(0, 0, W, H)
+
+        // --- top brand ---
+        ctx.fillStyle = '#888888'
+        ctx.font = 'normal 400 18px sans-serif'
+        ctx.textAlign = 'center'
+        ctx.textBaseline = 'alphabetic'
+        ctx.fillText('平板的支撑', W / 2, 36)
+
+        // --- main card shadow ---
+        ctx.save()
+        ctx.fillStyle = 'rgba(0,0,0,0.06)'
+        roundRect(38, 54, 424, 250, 22)
+        ctx.fill()
+        ctx.restore()
+
+        // --- main card ---
+        ctx.save()
+        ctx.fillStyle = '#FFFFFF'
+        roundRect(35, 52, 430, 246, 20)
+        ctx.fill()
+        ctx.restore()
+
+        // --- gradient circle icon (same feel as completion-emoji-wrap) ---
+        const circleX = W / 2
+        const circleY = 108
+        const circleR = 40
+        const grad = ctx.createLinearGradient(circleX - circleR, circleY - circleR, circleX + circleR, circleY + circleR)
+        grad.addColorStop(0, '#4CAF50')
+        grad.addColorStop(1, '#81C784')
+        ctx.fillStyle = grad
+        ctx.beginPath()
+        ctx.arc(circleX, circleY, circleR, 0, Math.PI * 2)
+        ctx.fill()
+
+        // --- white star ---
+        ctx.fillStyle = '#FFFFFF'
+        drawStar(circleX, circleY, 20, 8, 5)
+        ctx.fill()
+
+        // --- status text ---
+        ctx.fillStyle = '#333333'
+        ctx.font = 'normal 600 22px sans-serif'
+        ctx.textAlign = 'center'
+        ctx.textBaseline = 'alphabetic'
+        ctx.fillText(message, W / 2, 172)
+
+        // --- big number + unit ---
+        const fmt = this._formatShareDuration(elapsed)
+        const numLen = fmt.num.length
+        const numSize = numLen <= 2 ? 90 : numLen <= 3 ? 76 : numLen <= 4 ? 60 : 48
+        ctx.font = `normal 800 ${numSize}px sans-serif`
+        ctx.textAlign = 'right'
+        ctx.textBaseline = 'alphabetic'
+        ctx.fillStyle = primary
+        const numX = W / 2 + 4
+        const numY = 230
+        ctx.fillText(fmt.num, numX, numY)
+
+        ctx.fillStyle = '#666666'
+        ctx.font = 'normal 600 22px sans-serif'
+        ctx.textAlign = 'left'
+        ctx.fillText(fmt.unit, numX + 8, numY - 6)
+
+        // --- streak ---
+        if (streak > 0) {
+          ctx.fillStyle = primary
+          ctx.font = 'normal 500 18px sans-serif'
+          ctx.textAlign = 'center'
+          ctx.fillText(`连续打卡 ${streak} 天`, W / 2, 272)
+        }
+
+        // --- bottom left: CTA text ---
+        ctx.textAlign = 'left'
+        ctx.textBaseline = 'alphabetic'
+        ctx.fillStyle = '#333333'
+        ctx.font = 'normal 700 22px sans-serif'
+        ctx.fillText('扫码一起打卡', 48, 338)
+
+        ctx.fillStyle = '#999999'
+        ctx.font = 'normal 400 15px sans-serif'
+        ctx.fillText('平板的支撑 · 每天进步一点点', 48, 366)
+
+        // --- bottom right: QR code ---
+        const qrSize = 88
+        const qrX = W - 48 - qrSize
+        const qrY = 308
+        const doExport = () => {
+          wx.canvasToTempFilePath({
+            canvas,
+            width: W,
+            height: H,
+            destWidth: W,
+            destHeight: H,
+            fileType: 'jpg',
+            quality: 0.9,
+            success: (r) => {
+              this._shareImageUrl = r.tempFilePath
+            },
+            fail: (err) => {
+              console.warn('[sharePoster] export failed', err)
+            }
+          })
+        }
+
+        const img = canvas.createImage()
+        img.src = '/static/share-qr.jpg'
+        img.onload = () => {
+          ctx.save()
+          ctx.fillStyle = '#FFFFFF'
+          roundRect(qrX - 6, qrY - 6, qrSize + 12, qrSize + 12, 8)
+          ctx.fill()
+          ctx.drawImage(img, qrX, qrY, qrSize, qrSize)
+          ctx.restore()
+          doExport()
+        }
+        img.onerror = () => {
+          // 二维码加载失败时仍导出一张无二维码的海报,避免分享按钮失效
+          doExport()
+        }
+      })
+  },
+
+  /**
+   * 分享图专用时长格式化(与弹窗 WXS fmt 口径一致)。
+   */
+  _formatShareDuration(s) {
+    s = Math.floor(s || 0)
+    if (s < 60) return { num: String(s), unit: '秒' }
+    const m = Math.floor(s / 60)
+    const sec = s % 60
+    return sec === 0 ? { num: String(m), unit: '分钟' } : { num: `${m}分${sec}`, unit: '秒' }
+  },
+
   /**
    * 分享给朋友。训练完成弹窗里的分享按钮会走到这里,标题里拼上用户
    * 刚才撑了多久,转化率更高;右上角"···"菜单也共用同一份文案。
@@ -978,7 +1178,8 @@ Page({
     const s = config.share.timer
     return {
       title: s.titleTemplate.replace('{elapsed}', elapsed),
-      path: s.path
+      path: s.path,
+      imageUrl: this._shareImageUrl || ''
     }
   },
 
diff --git a/pages/timer/timer.wxml b/pages/timer/timer.wxml
index e357234..641288a 100644
--- a/pages/timer/timer.wxml
+++ b/pages/timer/timer.wxml
@@ -215,4 +215,7 @@
       </view>
     </view>
   </view>
+
+  <!-- 隐藏 canvas:用于绘制训练完成分享海报,onShareAppMessage 取它的导出图 -->
+  <canvas type="2d" id="sharePoster" class="share-poster-canvas"></canvas>
 </view>
diff --git a/pages/timer/timer.wxss b/pages/timer/timer.wxss
index 394a07b..385eeb9 100644
--- a/pages/timer/timer.wxss
+++ b/pages/timer/timer.wxss
@@ -638,3 +638,14 @@
   color: #FFFFFF;
   box-shadow: 0 6rpx 16rpx rgba(var(--primary-rgb), 0.3);
 }
+
+/* ---- hidden canvas for share poster (drawn on completion, consumed by onShareAppMessage) ---- */
+.share-poster-canvas {
+  position: fixed;
+  left: -9999px;
+  top: -9999px;
+  width: 500px;
+  height: 400px;
+  pointer-events: none;
+  opacity: 0;
+}
diff --git a/static/share-qr.jpg b/static/share-qr.jpg
new file mode 100644
index 0000000..8bc4ceb
Binary files /dev/null and b/static/share-qr.jpg differ