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+# VerticalProgressBar Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Add a reusable `VerticalProgressBar` Vue component to the support-activity page that visually displays real-time progress (current / target) with a vertical bar, a target circle at the top, and a current circle that moves up as progress increases.
+
+**Architecture:** Single self-contained Vue 3 SFC using `<script setup>`. Position is `fixed` on the left side of the screen. The component reads `current` and `target` props, computes a `ratio` (0~1), and uses CSS variables to drive the fill height and the current circle's `top` position. No external state, no bus, no animation library. Used as a sibling of `ThemeBanner` in `support-activity/index.vue` (not embedded inside it).
+
+**Tech Stack:** Vue 3 (`<script setup>`), uni-app (vue-cli/H5 + 小程序双端), CSS3 transitions, `v-bind()` in `<style>` blocks (Vue 3 SFC feature).
+
+**Spec:** `docs/superpowers/specs/2026-06-02-vertical-progress-bar-design.md`
+
+---
+
+## File Structure
+
+| File | Status | Responsibility |
+|------|--------|----------------|
+| `frontend/pages/support-activity/components/VerticalProgressBar.vue` | Create | The component itself: template, props, computed (ratio, fillHeight, circleTop, formatted numbers), styles |
+| `frontend/pages/support-activity/index.vue` | Modify | Import the component and render it as a sibling of `ThemeBanner`, passing `progressData.current` and `progressData.target` |
+
+No other files are touched. The plan is intentionally narrow — single component, single integration point, single page. The `ThemeBanner.vue` is left untouched per the spec's "Out of Scope" section.
+
+---
+
+## Task 1: Create the `VerticalProgressBar.vue` component
+
+**Files:**
+- Create: `frontend/pages/support-activity/components/VerticalProgressBar.vue`
+
+- [ ] **Step 1: Write the component SFC with template, script, and scoped styles**
+
+Create the file `frontend/pages/support-activity/components/VerticalProgressBar.vue` with the following exact content:
+
+```vue
+<template>
+  <view class="v-progress">
+    <!-- 目标数字（位于目标圆上方） -->
+    <text v-if="showText" class="v-target-text">{{ formattedTarget }}</text>
+
+    <!-- 轨道 + 进度层 -->
+    <view
+      class="v-track"
+      :style="{ width: barWidth, height: barHeight }"
+    >
+      <!-- 已填充（从底部起） -->
+      <view class="v-fill" :style="{ height: fillHeight }" />
+
+      <!-- 目标圆（固定在顶部） -->
+      <view
+        class="v-circle v-target-circle"
+        :style="{ width: circleSize, height: circleSize }"
+      />
+
+      <!-- 当前圆（随 progress 上移） -->
+      <view
+        class="v-circle v-current-circle"
+        :style="{ top: circleTop, width: circleSize, height: circleSize }"
+      >
+        <text v-if="showText" class="v-current-text">{{ formattedCurrent }}</text>
+      </view>
+    </view>
+  </view>
+</template>
+
+<script setup>
+import { computed, ref, watch } from 'vue'
+
+const props = defineProps({
+  current: { type: Number, default: 0 },
+  target: { type: Number, default: 100 },
+  barHeight: { type: String, default: '200rpx' },
+  barWidth: { type: String, default: '16rpx' },
+  circleSize: { type: String, default: '60rpx' },
+  fillColor: {
+    type: String,
+    default: 'linear-gradient(180deg, #FFD700, #FFA500)'
+  },
+  trackColor: {
+    type: String,
+    default: 'rgba(255, 255, 255, 0.2)'
+  },
+  textColor: { type: String, default: '#FFD700' },
+  targetColor: { type: String, default: 'rgba(255, 255, 255, 0.8)' },
+  showText: { type: Boolean, default: true }
+})
+
+// 进度比例（0~1），将来要换公式只改这一处
+const ratio = computed(() => {
+  if (props.target === 0) return 0
+  return Math.min(props.current / props.target, 1)
+})
+
+// 已填充高度：ratio × 100%（从底部起）
+const fillHeight = computed(() => ratio.value * 100 + '%')
+
+// 当前圆位置：(1 - ratio) × 100%（从顶部起）
+const circleTop = computed(() => (1 - ratio.value) * 100 + '%')
+
+// 数字本地化：用 ref + watch 避免每帧调用 toLocaleString
+const formattedCurrent = ref(props.current.toLocaleString())
+const formattedTarget = ref(props.target.toLocaleString())
+
+watch(() => props.current, (v) => {
+  formattedCurrent.value = v.toLocaleString()
+})
+
+watch(() => props.target, (v) => {
+  formattedTarget.value = v.toLocaleString()
+})
+</script>
+
+<style scoped>
+.v-progress {
+  position: fixed;
+  left: 24rpx;
+  top: 50%;
+  transform: translateY(-50%);
+  z-index: 50;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  /* 其它样式（背景框、阴影等）留空，方便用户自行调 */
+}
+
+.v-target-text {
+  color: v-bind(targetColor);
+  font-size: 20rpx;
+  line-height: 1;
+  margin-bottom: 8rpx;
+  white-space: nowrap;
+}
+
+.v-track {
+  position: relative;
+  background: v-bind(trackColor);
+  border-radius: 999rpx;
+  /* 关键：让圆能露出轨道边界 */
+  overflow: visible;
+}
+
+.v-fill {
+  position: absolute;
+  bottom: 0;
+  left: 0;
+  width: 100%;
+  background: v-bind(fillColor);
+  border-radius: 999rpx;
+  transition: height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
+}
+
+.v-circle {
+  position: absolute;
+  left: 50%;
+  transform: translate(-50%, -50%);
+  border-radius: 50%;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  box-sizing: border-box;
+}
+
+.v-target-circle {
+  top: 0;
+  background: rgba(255, 255, 255, 0.3);
+  /* 目标圆不显示数字 */
+}
+
+.v-current-circle {
+  background: v-bind(fillColor);
+  color: v-bind(textColor);
+  transition: top 0.4s cubic-bezier(0.4, 0, 0.2, 1);
+}
+
+.v-current-text {
+  font-size: 20rpx;
+  line-height: 1;
+  white-space: nowrap;
+  color: v-bind(textColor);
+}
+</style>
+```
+
+- [ ] **Step 2: Verify the file is syntactically valid by re-reading it**
+
+Run: `cat /Users/liulujian/Documents/code/TopFansByGithub/frontend/pages/support-activity/components/VerticalProgressBar.vue | head -5`
+Expected: First line is `<template>`, file is non-empty.
+
+- [ ] **Step 3: Commit**
+
+```bash
+git add frontend/pages/support-activity/components/VerticalProgressBar.vue
+git commit -m "feat(support-activity): add VerticalProgressBar component"
+```
+
+---
+
+## Task 2: Wire the component into `support-activity/index.vue`
+
+**Files:**
+- Modify: `frontend/pages/support-activity/index.vue` (import line + render the component as a sibling of `ThemeBanner`)
+
+- [ ] **Step 1: Add the import statement**
+
+In `frontend/pages/support-activity/index.vue`, locate the import block near the bottom of `<script setup>` (the line `import ThemeBanner from './components/ThemeBanner.vue'`). Add the following import line **immediately after** the `ThemeBanner` import:
+
+```js
+import VerticalProgressBar from './components/VerticalProgressBar.vue'
+```
+
+After the edit, the imports block reads (in order, lines ~126-135):
+
+```js
+import Header from '../components/Header.vue';
+import BottomNav from '../components/BottomNav.vue';
+import ThemeBanner from './components/ThemeBanner.vue'
+import VerticalProgressBar from './components/VerticalProgressBar.vue'   // <-- new
+import ContributionList from './components/ContributionList.vue'
+import StageArea from './components/StageArea.vue'
+import FloatingBubbles from './components/FloatingBubbles.vue'
+import ActivityRankingModal from './components/ActivityRankingModal.vue'
+import ActionBar from './components/ActionBar.vue'
+```
+
+- [ ] **Step 2: Add the component render block**
+
+In the `<template>` of the same file, locate the `<ThemeBanner ... />` block. **Immediately after the closing `</ThemeBanner>` tag** (i.e., between `</ThemeBanner>` and the next `<!-- 实时贡献列表 -->` comment), insert the following:
+
+```vue
+    <!-- 竖向进度条（fixed 定位，左侧） -->
+    <VerticalProgressBar
+      v-if="progressData.target > 0"
+      :current="progressData.current"
+      :target="progressData.target"
+    />
+```
+
+The inserted block goes inside `<view class="activity-container">` but as a sibling of `ThemeBanner`, not inside it. The exact position after the edit:
+
+```vue
+    <ThemeBanner
+      v-if="config"
+      :title="config.title"
+      :banner-image="config.bannerImage"
+      :current="progressData.current"
+      :target="progressData.target"
+      :is-stale-data="isStaleData"
+      @tap="openRankingModal"
+    />
+
+    <!-- 竖向进度条（fixed 定位，左侧） -->
+    <VerticalProgressBar
+      v-if="progressData.target > 0"
+      :current="progressData.current"
+      :target="progressData.target"
+    />
+
+    <!-- 实时贡献列表 -->
+    <ContributionList
+      v-if="activityId && !isLoading"
+      :activity-id="activityId"
+      class="contribution-list-wrapper"
+    />
+```
+
+- [ ] **Step 3: Re-read the file head to confirm changes are coherent**
+
+Run: `head -50 /Users/liulujian/Documents/code/TopFansByGithub/frontend/pages/support-activity/index.vue`
+Expected: The `<VerticalProgressBar>` render block is visible between `</ThemeBanner>` and the `<ContributionList>` comment.
+
+- [ ] **Step 4: Commit**
+
+```bash
+git add frontend/pages/support-activity/index.vue
+git commit -m "feat(support-activity): mount VerticalProgressBar on activity page"
+```
+
+---
+
+## Task 3: Verify build / lint pass
+
+**Files:** none modified
+
+- [ ] **Step 1: Check that the project lints clean for the new files**
+
+Run: `cd /Users/liulujian/Documents/code/TopFansByGithub/frontend && npx eslint pages/support-activity/components/VerticalProgressBar.vue pages/support-activity/index.vue 2>&1 | tail -30`
+
+Expected (one of):
+- `✓ No problems` / no output / no errors
+- Only style warnings already present in the file before changes
+
+If there are real errors (e.g., `Parsing error: ...` or `import not found`), fix the actual error and re-run.
+
+- [ ] **Step 2: Smoke-check that the Vue files parse by importing them through the build tooling**
+
+If the project has a `dev` script that uses Vite, run: `cd /Users/liulujian/Documents/code/TopFansByGithub/frontend && timeout 30 npm run dev:h5 2>&1 | head -40`
+Expected: Server starts, no compile errors referencing `VerticalProgressBar` or `support-activity/index.vue`. If compile errors appear, fix them and retry.
+
+If `dev:h5` is not available, skip this step and rely on step 1's lint result.
+
+- [ ] **Step 3: Commit any build / lint fixes (if any)**
+
+If you had to fix anything in Steps 1 or 2:
+
+```bash
+git add frontend/pages/support-activity/components/VerticalProgressBar.vue frontend/pages/support-activity/index.vue
+git commit -m "fix(support-activity): resolve lint/build issues for VerticalProgressBar"
+```
+
+If nothing was changed, skip this commit.
+
+---
+
+## Self-Review
+
+**Spec coverage**:
+- Spec §"Props" → Task 1 Step 1 (all 10 props with default values)
+- Spec §"模板" → Task 1 Step 1 (template structure with `v-if="showText"`)
+- Spec §"计算公式" → Task 1 Step 1 (ratio / fillHeight / circleTop with explicit `(current/target)` formula and replaceability note)
+- Spec §"CSS 关键点" → Task 1 Step 1 (full CSS block with `position: fixed`, `overflow: visible`, transitions)
+- Spec §"使用方式" (don't modify ThemeBanner, use as sibling) → Task 2 Steps 1-2
+- Spec §"边界与错误处理" (target=0 guard) → Task 1 Step 1 (early return in `ratio` computed)
+- Spec §"Out of Scope" (no ThemeBanner changes, no tests) → No task modifies ThemeBanner; no test task created
+
+**Placeholder scan**:
+- No TBD / TODO / "implement later" markers in the plan
+- All code blocks are complete and runnable
+- No "similar to Task N" references — each task's code is self-contained
+- All file paths are exact
+
+**Type consistency**:
+- Props defined in Task 1 (`current`, `target`, etc.) are read in Task 1's script and passed by name in Task 2's render block ✓
+- `progressData.current` / `progressData.target` are read in `index.vue` script (pre-existing) and bound to `:current` / `:target` in Task 2 ✓
+- `ratio` / `fillHeight` / `circleTop` are defined and used only in Task 1 ✓