commit 00dc5685762999cc02535841a1596cae55313a7b
Author: xiaomai <xiaomai@ramatex.com.my>
Date:   Wed Oct 22 15:57:46 2025 +0800

    initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ffa72e4
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,7 @@
+Ramatex Tasks.json
+*.private.json
+*.local.json
+node_modules/
+dist/
+.DS_Store
+
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..bfec2cd
--- /dev/null
+++ b/README.md
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+Open Kanban
+===========
+
+一款可本地使用、可开源的离线 Kanban（看板）。
+
+- 纯前端（HTML/CSS/JS），无需安装服务端。
+- 数据保存在本机（Windows）JSON 文件中，支持导入/导出。
+- 支持拖拽移动/排序任务，编辑任务详情、步骤、类别、阶段和布局。
+- 增强协作：导入他人导出的文件时，提供差异预览与合并策略（偏向导入/偏向当前），可选同步删除缺失项。
+- 记录操作历史（meta.history），便于追踪改动来源与时间。
+
+快速开始
+--------
+
+1. 双击打开 `index.html`（推荐使用 Chrome/Edge）。
+2. 默认不会自动读取任何私有 JSON 文件，点击“打开…”手动选择，或配置 `config.json` 指定示例文件。
+3. 可直接使用仓库内的 `sample-board.json` 开始体验。
+
+提示：如需本地 HTTP 访问（可避免部分浏览器对 file:// 读取限制），可在此目录临时起一个服务，例如：
+- PowerShell: 以管理员打开 PowerShell，执行 `cd <此目录>; python -m http.server 8989`，浏览器访问 `http://localhost:8989/`。
+
+主要功能
+--------
+
+- 打开/保存
+  - “打开…”读取 JSON 文件至内存。
+  - “保存/导出”将当前看板下载为 JSON 文件（默认名取自 `config.json` 的 `defaultFilename`，默认为 `kanban.json`）。
+- 看板与拖拽
+  - 根据 `layout.columns` 渲染多列，每列可包含多个阶段（stage）。
+  - 支持跨阶段、阶段内排序拖放；自动更新 `stages[].tasks` 顺序。
+- 任务管理
+  - 添加、编辑、删除任务；编辑标题、描述、类别与步骤（含勾选完成）。
+  - 卡片上显示类别与步骤完成统计。
+- 阶段与类别
+  - 添加、重命名、删除阶段（空阶段可删）；选择列位置。
+  - 添加、重命名类别与颜色；正被引用的类别不可删除。
+- 搜索/筛选
+  - 关键词搜索（标题/描述），按类别筛选。
+- 协作导入/合并
+  - “导入/合并…”选择 JSON 后显示差异预览：任务/阶段新增、删除、修改，布局变化。
+  - 合并策略：
+    - 冲突优先“导入文件”：相同 ID 的任务/阶段在冲突字段上使用导入方；阶段任务顺序、布局亦以导入方为准。
+    - 冲突优先“当前看板”：保持当前数据，仅补充导入方新增项。
+  - 可选“同步删除在导入文件中不存在的任务/阶段”。
+- 历史记录
+  - 记录操作人（右上角输入框），以及每次操作（新增、编辑、移动、合并等）。
+  - 支持“清空历史（写入文件）”，以在文件内重置历史并记录一次清空事件。
+
+数据结构说明（兼容扩展）
+----------------------
+
+原始结构：
+- `categories`: `[{ uuid, title, color }]`
+- `stages`: `[{ uuid, title, tasks: [taskUuid] }]`
+- `tasks`: `[{ uuid, title, description, category, steps: [{ details, done }] }]`
+- `layout`: `{ columns: [[stageUuid, ...], ...] }`
+
+本应用增加可选 `meta` 字段，用于协作追踪：
+- `meta`: `{ id: 'open-kanban', version, createdAt, modifiedAt, actor, history: [{ id, ts, actor, type, payload }] }`
+
+未包含 `meta` 的旧文件可直接读取，保存时会补充。
+
+协作建议
+--------
+
+- 建议每位协作者在右上角填写自己的名字，导出前先“保存/导出”。
+- 通过“导入/合并…”接收他人文件时，先查看差异预览，再选择合并策略。
+- 需要严格控制主副本时，勾选“同步删除缺失项”，保持两侧严格一致。
+- 如需更细粒度的冲突解决（按字段逐项选择），欢迎提 Issue 我再扩展 UI 细节功能。
+
+已知限制与备注
+--------------
+
+- 纯前端页面无法直接写入磁盘文件，需要通过“保存/导出”下载保存。
+- 若浏览器禁止 `file://` 下的 `fetch`，自动读取示例或私有 JSON 可能失败，请手动“打开…”。
+- 阶段删除仅允许删除空阶段（避免误删任务）。如需支持“连同任务一起删除/移动到归档”，可以后续补充选项。
+
+配置与目录结构
+--------------
+
+- `index.html` 入口页面
+- `styles.css` 样式
+- `app.js` 主逻辑
+- `config.json` 应用配置（可选）：
+  - `appTitle`: 页面标题（默认 `Kanban`）
+  - `defaultFilename`: 导出默认文件名（默认 `kanban.json`）
+  - `autoLoadFile`: 启动时自动读取的文件（默认空，不自动读取）
+- `sample-board.json` 示例数据（通用，未包含任何公司/隐私信息）
+- `.gitignore` 已默认忽略常见私有文件名（如 `*.private.json`、`*.local.json` 等），避免误提交
+
+欢迎提出改进需求，我可以继续完善比如：按人分配、任务评论、每列 WIP 限制、标签、多选批量操作、导出增量补丁等。
+
+隐私与开源建议
+--------------
+
+- 默认不会自动读取任何私有数据。
+- 如需在本地使用私有数据，请将你的私有文件（例如 `tasks.private.json`）保留在本地且不提交到仓库；可将该文件名加入 `.gitignore`。
+- 如需自动加载示例或指定文件，请在 `config.json` 中设置 `autoLoadFile`（建议指向 `sample-board.json`）。
+- 若需更换品牌/标题，请在 `config.json` 中修改 `appTitle`；代码与 UI 默认不显示任何公司名称。
diff --git a/app.js b/app.js
new file mode 100644
index 0000000..832eed2
--- /dev/null
+++ b/app.js
@@ -0,0 +1,990 @@
+// Open Kanban - Pure JS implementation
+// Uses the schema compatible with your prior board JSON and adds optional `meta` for history.
+
+// ---- Utilities ----
+function uuidv4() {
+  // RFC4122 v4 - simplified
+  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
+    const r = (Math.random() * 16) | 0,
+      v = c === 'x' ? r : (r & 0x3) | 0x8;
+    return v.toString(16);
+  });
+}
+
+function deepClone(obj) {
+  return structuredClone ? structuredClone(obj) : JSON.parse(JSON.stringify(obj));
+}
+
+function nowIso() {
+  return new Date().toISOString();
+}
+
+function download(filename, text) {
+  const element = document.createElement('a');
+  element.setAttribute('href', 'data:application/json;charset=utf-8,' + encodeURIComponent(text));
+  element.setAttribute('download', filename);
+  element.style.display = 'none';
+  document.body.appendChild(element);
+  element.click();
+  document.body.removeChild(element);
+}
+
+// ---- State ----
+const state = {
+  filename: '',
+  dirty: false,
+  board: null, // full schema
+  selectedTaskId: null,
+  lastLoadedSnapshot: null, // baseline for delta/diff exports (optional)
+};
+
+// App-level config (overridable by config.json)
+const appConfig = {
+  appTitle: 'Kanban',
+  defaultFilename: 'kanban.json',
+  autoLoadFile: '', // do not auto-load by default; can be set to e.g. 'sample-board.json'
+};
+
+// Default empty board
+function makeEmptyBoard() {
+  return {
+    categories: [],
+    stages: [],
+    tasks: [],
+    layout: { columns: [] },
+    meta: {
+      id: 'open-kanban',
+      version: '1.0.0',
+      createdAt: nowIso(),
+      modifiedAt: nowIso(),
+      actor: '',
+      history: [],
+    },
+  };
+}
+
+// ---- DOM Refs ----
+const el = {
+  fileStatus: document.getElementById('fileStatus'),
+  openFile: document.getElementById('openFile'),
+  importFile: document.getElementById('importFile'),
+  saveBtn: document.getElementById('saveBtn'),
+  newBoardBtn: document.getElementById('newBoardBtn'),
+  actorInput: document.getElementById('actorInput'),
+  searchInput: document.getElementById('searchInput'),
+  categoryFilter: document.getElementById('categoryFilter'),
+  board: document.getElementById('board'),
+  categoriesList: document.getElementById('categoriesList'),
+  addCategoryBtn: document.getElementById('addCategoryBtn'),
+  layoutInfo: document.getElementById('layoutInfo'),
+  historyList: document.getElementById('historyList'),
+  clearHistoryBtn: document.getElementById('clearHistoryBtn'),
+  addStageBtn: document.getElementById('addStageBtn'),
+  addColumnBtn: document.getElementById('addColumnBtn'),
+  // Task modal
+  taskModal: document.getElementById('taskModal'),
+  taskModalClose: document.getElementById('taskModalClose'),
+  taskTitleInput: document.getElementById('taskTitleInput'),
+  taskCategorySelect: document.getElementById('taskCategorySelect'),
+  taskDescInput: document.getElementById('taskDescInput'),
+  stepsContainer: document.getElementById('stepsContainer'),
+  addStepBtn: document.getElementById('addStepBtn'),
+  deleteTaskBtn: document.getElementById('deleteTaskBtn'),
+  taskSaveBtn: document.getElementById('taskSaveBtn'),
+  // Merge modal
+  mergeModal: document.getElementById('mergeModal'),
+  mergeModalClose: document.getElementById('mergeModalClose'),
+  mergePolicy: document.getElementById('mergePolicy'),
+  mergeRemoveMissing: document.getElementById('mergeRemoveMissing'),
+  diffSummary: document.getElementById('diffSummary'),
+  diffDetails: document.getElementById('diffDetails'),
+  applyMergeBtn: document.getElementById('applyMergeBtn'),
+};
+
+// ---- Helpers to access entities ----
+function idxById(arr, id) {
+  return arr.findIndex((x) => x.uuid === id);
+}
+function getCategory(id) {
+  return state.board.categories.find((x) => x.uuid === id) || null;
+}
+function getStage(id) {
+  return state.board.stages.find((x) => x.uuid === id) || null;
+}
+function getTask(id) {
+  return state.board.tasks.find((x) => x.uuid === id) || null;
+}
+
+// ---- History ----
+function logEvent(type, payload) {
+  const actor = state.board?.meta?.actor || '';
+  const entry = { id: uuidv4(), ts: nowIso(), actor, type, payload };
+  state.board.meta.history.push(entry);
+  state.board.meta.modifiedAt = nowIso();
+  state.dirty = true;
+  renderHistory();
+  updateFileStatus();
+}
+
+// ---- Load / Save ----
+function updateFileStatus() {
+  const n = state.filename || '(未命名)';
+  const a = state.board?.meta?.actor ? ` | 操作人：${state.board.meta.actor}` : '';
+  el.fileStatus.textContent = `${n}${state.dirty ? ' *' : ''}${a}`;
+}
+
+function setBoard(newBoard, filename = '') {
+  // normalize optional meta
+  if (!newBoard.meta) {
+    newBoard.meta = {
+      id: 'open-kanban',
+      version: '1.0.0',
+      createdAt: nowIso(),
+      modifiedAt: nowIso(),
+      actor: state.actor || '',
+      history: [],
+    };
+  }
+  if (!newBoard.layout) newBoard.layout = { columns: [] };
+  if (!newBoard.layout.columns) newBoard.layout.columns = [];
+  state.board = newBoard;
+  state.filename = filename;
+  state.dirty = false;
+  state.lastLoadedSnapshot = deepClone(newBoard);
+  el.actorInput.value = state.board.meta.actor || '';
+  populateCategoryFilter();
+  renderAll();
+}
+
+async function loadConfig() {
+  try {
+    const res = await fetch('config.json', { cache: 'no-store' });
+    if (res.ok) {
+      const cfg = await res.json();
+      if (cfg && typeof cfg === 'object') {
+        if (cfg.appTitle) appConfig.appTitle = cfg.appTitle;
+        if (cfg.defaultFilename) appConfig.defaultFilename = cfg.defaultFilename;
+        if (typeof cfg.autoLoadFile === 'string') appConfig.autoLoadFile = cfg.autoLoadFile;
+      }
+    }
+  } catch (_) {
+    // ignore
+  }
+  // Apply title
+  const titleEl = document.getElementById('appTitle');
+  const pageTitle = document.getElementById('pageTitle');
+  if (titleEl) titleEl.textContent = appConfig.appTitle;
+  if (pageTitle) pageTitle.textContent = appConfig.appTitle;
+  document.title = appConfig.appTitle;
+}
+
+function getQueryParam(name) {
+  const url = new URL(window.location.href);
+  return url.searchParams.get(name);
+}
+
+async function bootstrapLoad() {
+  await loadConfig();
+  const qp = getQueryParam('file');
+  const fileToLoad = qp || appConfig.autoLoadFile || '';
+  if (!fileToLoad) {
+    setBoard(makeEmptyBoard());
+    return;
+  }
+  try {
+    const res = await fetch(fileToLoad, { cache: 'no-store' });
+    if (res.ok) {
+      const json = await res.json();
+      setBoard(json, fileToLoad);
+      logEvent('load-file', { name: fileToLoad, via: qp ? 'query' : 'config' });
+      return;
+    }
+  } catch (_) {}
+  setBoard(makeEmptyBoard());
+}
+
+function handleOpenFile(ev) {
+  const file = ev.target.files?.[0];
+  if (!file) return;
+  const reader = new FileReader();
+  reader.onload = () => {
+    try {
+      const json = JSON.parse(String(reader.result));
+      setBoard(json, file.name);
+      logEvent('load-file', { name: file.name, size: file.size });
+    } catch (e) {
+      alert('解析 JSON 失败：' + e.message);
+    }
+  };
+  reader.readAsText(file);
+  // reset value to allow opening same file again
+  ev.target.value = '';
+}
+
+function handleImportFile(ev) {
+  const file = ev.target.files?.[0];
+  if (!file) return;
+  const reader = new FileReader();
+  reader.onload = () => {
+    try {
+      const imported = JSON.parse(String(reader.result));
+      showMergePreview(imported, file.name);
+    } catch (e) {
+      alert('解析 JSON 失败：' + e.message);
+    }
+  };
+  reader.readAsText(file);
+  ev.target.value = '';
+}
+
+function handleSave() {
+  if (!state.board) return;
+  state.board.meta.actor = el.actorInput.value.trim();
+  state.board.meta.modifiedAt = nowIso();
+  const filename = state.filename || appConfig.defaultFilename || 'kanban.json';
+  const text = JSON.stringify(state.board, null, 2);
+  download(filename, text);
+  state.dirty = false;
+  updateFileStatus();
+}
+
+function handleNewBoard() {
+  if (state.dirty && !confirm('当前更改尚未保存，确定新建吗？')) return;
+  const board = makeEmptyBoard();
+  setBoard(board);
+  logEvent('new-board', {});
+}
+
+// ---- Renderers ----
+function renderAll() {
+  renderCategories();
+  renderBoard();
+  renderHistory();
+  renderLayoutInfo();
+  updateFileStatus();
+}
+
+function populateCategoryFilter() {
+  const sel = el.categoryFilter;
+  while (sel.firstChild) sel.removeChild(sel.firstChild);
+  const optAll = document.createElement('option');
+  optAll.value = '';
+  optAll.textContent = '筛选：全部类别';
+  sel.appendChild(optAll);
+  state.board.categories.forEach((c) => {
+    const op = document.createElement('option');
+    op.value = c.uuid;
+    op.textContent = c.title;
+    sel.appendChild(op);
+  });
+}
+
+function renderCategories() {
+  const root = el.categoriesList;
+  root.innerHTML = '';
+  state.board.categories.forEach((c) => {
+    const row = document.createElement('div');
+    row.className = 'category-item';
+
+    const sw = document.createElement('span');
+    sw.className = 'swatch';
+    sw.style.background = '#' + (c.color || '888888');
+    row.appendChild(sw);
+
+    const title = document.createElement('input');
+    title.type = 'text';
+    title.value = c.title;
+    title.addEventListener('change', () => {
+      c.title = title.value.trim() || c.title;
+      state.dirty = true;
+      populateCategoryFilter();
+      renderBoard();
+      logEvent('category-rename', { id: c.uuid, title: c.title });
+    });
+    row.appendChild(title);
+
+    const color = document.createElement('input');
+    color.type = 'text';
+    color.value = c.color || '';
+    color.placeholder = '颜色 hex (不含#)';
+    color.style.width = '110px';
+    color.addEventListener('change', () => {
+      const v = color.value.replace(/#/g, '').slice(0, 6);
+      c.color = v;
+      sw.style.background = '#' + v;
+      state.dirty = true;
+      renderBoard();
+      logEvent('category-color', { id: c.uuid, color: v });
+    });
+    row.appendChild(color);
+
+    const del = document.createElement('button');
+    del.className = 'btn small';
+    del.textContent = '删除';
+    del.addEventListener('click', () => {
+      // only allow delete if unused
+      const used = state.board.tasks.some((t) => t.category === c.uuid);
+      if (used) return alert('该类别已被任务引用，无法删除');
+      state.board.categories = state.board.categories.filter((x) => x.uuid !== c.uuid);
+      state.dirty = true;
+      populateCategoryFilter();
+      renderCategories();
+      logEvent('category-delete', { id: c.uuid });
+    });
+    row.appendChild(del);
+
+    root.appendChild(row);
+  });
+}
+
+function renderLayoutInfo() {
+  const li = el.layoutInfo;
+  const cols = state.board.layout?.columns || [];
+  let txt = `列数：${cols.length}`;
+  txt += '\n阶段总数：' + state.board.stages.length;
+  li.textContent = txt;
+}
+
+function renderHistory() {
+  const root = el.historyList;
+  root.innerHTML = '';
+  const hist = (state.board.meta && state.board.meta.history) || [];
+  hist.slice().reverse().slice(0, 200).forEach((h) => {
+    const div = document.createElement('div');
+    div.className = 'event';
+    const actor = h.actor ? `@${h.actor}` : '';
+    div.textContent = `${h.ts} ${actor} ${h.type}`;
+    root.appendChild(div);
+  });
+}
+
+function createEl(tag, className, text) {
+  const e = document.createElement(tag);
+  if (className) e.className = className;
+  if (text != null) e.textContent = String(text);
+  return e;
+}
+
+function renderBoard() {
+  const board = el.board;
+  board.innerHTML = '';
+  const filterText = el.searchInput.value.trim().toLowerCase();
+  const filterCat = el.categoryFilter.value;
+
+  const columns = state.board.layout?.columns || [];
+  if (!columns.length) {
+    // fallback: one column containing all stages by order
+    const allStageIds = state.board.stages.map((s) => s.uuid);
+    columns.push(allStageIds);
+  }
+
+  columns.forEach((stageIdList, colIdx) => {
+    const col = createEl('div', 'board-column');
+    stageIdList.forEach((sid) => {
+      const s = getStage(sid);
+      if (!s) return;
+      const stageEl = createEl('div', 'stage');
+      stageEl.dataset.stageId = s.uuid;
+
+      const header = createEl('div', 'stage-header');
+      const title = createEl('div', 'stage-title', s.title || '未命名阶段');
+      header.appendChild(title);
+      const actions = createEl('div', 'stage-actions');
+      const addBtn = createEl('button', 'btn small', '添加任务');
+      addBtn.addEventListener('click', () => addTaskIntoStage(s.uuid));
+      const renameBtn = createEl('button', 'btn small', '重命名');
+      renameBtn.addEventListener('click', () => renameStage(s.uuid));
+      const moveBtn = createEl('button', 'btn small', '移列');
+      moveBtn.addEventListener('click', () => moveStageToColumn(s.uuid));
+      const delBtn = createEl('button', 'btn small', '删除');
+      delBtn.addEventListener('click', () => deleteStage(s.uuid));
+      actions.appendChild(addBtn);
+      actions.appendChild(renameBtn);
+      actions.appendChild(moveBtn);
+      actions.appendChild(delBtn);
+      header.appendChild(actions);
+      stageEl.appendChild(header);
+
+      const list = createEl('div', 'task-list');
+      list.dataset.stageId = s.uuid;
+
+      enableListDnd(list);
+
+      // tasks in order
+      (s.tasks || []).forEach((tid) => {
+        const t = getTask(tid);
+        if (!t) return;
+        // filters
+        const hitText = !filterText ||
+          t.title?.toLowerCase().includes(filterText) ||
+          t.description?.toLowerCase().includes(filterText);
+        const hitCat = !filterCat || t.category === filterCat;
+        if (!(hitText && hitCat)) return;
+        const card = renderTaskCard(t);
+        list.appendChild(card);
+      });
+
+      stageEl.appendChild(list);
+      col.appendChild(stageEl);
+    });
+    board.appendChild(col);
+  });
+}
+
+function categoryChip(catId) {
+  const c = getCategory(catId);
+  const span = createEl('span', 'chip');
+  if (!c) {
+    span.textContent = '未分类';
+    return span;
+  }
+  span.textContent = c.title;
+  span.style.background = '#' + (c.color || '888888') + '33';
+  span.style.borderColor = '#' + (c.color || '888888');
+  return span;
+}
+
+function stepStats(steps) {
+  if (!Array.isArray(steps) || steps.length === 0) return '0/0';
+  const done = steps.filter((s) => s.done).length;
+  return `${done}/${steps.length}`;
+}
+
+function renderTaskCard(t) {
+  const div = createEl('div', 'task');
+  div.draggable = true;
+  div.dataset.taskId = t.uuid;
+  div.addEventListener('dragstart', (e) => {
+    e.dataTransfer.setData('text/task', t.uuid);
+    e.dataTransfer.effectAllowed = 'move';
+  });
+
+  const grab = createEl('div', 'grab', '⋮⋮');
+  div.appendChild(grab);
+
+  const mid = createEl('div');
+  const title = createEl('div', 'title', t.title || '(无标题)');
+  mid.appendChild(title);
+  const meta = createEl('div', 'meta', `步骤: ${stepStats(t.steps || [])}`);
+  mid.appendChild(meta);
+  div.appendChild(mid);
+
+  const right = createEl('div', 'actions');
+  right.appendChild(categoryChip(t.category));
+  const editBtn = createEl('button', 'btn small', '编辑');
+  editBtn.addEventListener('click', () => openTaskModal(t.uuid));
+  right.appendChild(editBtn);
+  div.appendChild(right);
+
+  return div;
+}
+
+// ---- DnD ----
+function enableListDnd(listEl) {
+  listEl.addEventListener('dragover', (e) => {
+    e.preventDefault();
+    e.dataTransfer.dropEffect = 'move';
+    listEl.classList.add('drag-over');
+  });
+  listEl.addEventListener('dragleave', () => listEl.classList.remove('drag-over'));
+  listEl.addEventListener('drop', (e) => {
+    e.preventDefault();
+    listEl.classList.remove('drag-over');
+    const taskId = e.dataTransfer.getData('text/task');
+    if (!taskId) return;
+    const stageId = listEl.dataset.stageId;
+    // compute index
+    const children = Array.from(listEl.querySelectorAll('.task'));
+    const y = e.clientY;
+    let index = children.length;
+    for (let i = 0; i < children.length; i++) {
+      const rect = children[i].getBoundingClientRect();
+      if (y < rect.top + rect.height / 2) {
+        index = i;
+        break;
+      }
+    }
+    moveTaskToStage(taskId, stageId, index);
+  });
+}
+
+function moveTaskToStage(taskId, stageId, index) {
+  const fromStage = state.board.stages.find((s) => (s.tasks || []).includes(taskId));
+  const toStage = getStage(stageId);
+  if (!toStage) return;
+  if (fromStage && fromStage.uuid === toStage.uuid) {
+    // reorder within same stage
+    const arr = fromStage.tasks;
+    const oldIdx = arr.indexOf(taskId);
+    if (oldIdx === -1) return;
+    arr.splice(oldIdx, 1);
+    arr.splice(index > oldIdx ? index - 1 : index, 0, taskId);
+    state.dirty = true;
+    renderBoard();
+    logEvent('task-reorder', { stage: toStage.uuid, task: taskId, toIndex: index });
+    return;
+  }
+  // move across stages
+  if (fromStage) {
+    fromStage.tasks = (fromStage.tasks || []).filter((id) => id !== taskId);
+  }
+  if (!Array.isArray(toStage.tasks)) toStage.tasks = [];
+  const clampedIndex = Math.max(0, Math.min(index, toStage.tasks.length));
+  toStage.tasks.splice(clampedIndex, 0, taskId);
+  state.dirty = true;
+  renderBoard();
+  logEvent('task-move', { task: taskId, from: fromStage?.uuid || null, to: toStage.uuid, toIndex: clampedIndex });
+}
+
+// ---- Task CRUD ----
+function addTaskIntoStage(stageId) {
+  const t = {
+    uuid: uuidv4(),
+    title: '新任务',
+    description: '',
+    category: state.board.categories[0]?.uuid || null,
+    steps: [],
+  };
+  state.board.tasks.push(t);
+  const s = getStage(stageId);
+  if (s) {
+    if (!Array.isArray(s.tasks)) s.tasks = [];
+    s.tasks.push(t.uuid);
+  }
+  state.dirty = true;
+  logEvent('task-add', { task: t.uuid, stage: stageId });
+  renderBoard();
+  openTaskModal(t.uuid);
+}
+
+function openTaskModal(taskId) {
+  state.selectedTaskId = taskId;
+  const t = getTask(taskId);
+  if (!t) return;
+  el.taskTitleInput.value = t.title || '';
+  el.taskDescInput.value = t.description || '';
+  // categories
+  while (el.taskCategorySelect.firstChild) el.taskCategorySelect.removeChild(el.taskCategorySelect.firstChild);
+  const none = document.createElement('option');
+  none.value = '';
+  none.textContent = '未分类';
+  el.taskCategorySelect.appendChild(none);
+  state.board.categories.forEach((c) => {
+    const op = document.createElement('option');
+    op.value = c.uuid;
+    op.textContent = c.title;
+    el.taskCategorySelect.appendChild(op);
+  });
+  el.taskCategorySelect.value = t.category || '';
+
+  // steps
+  renderStepList(t);
+
+  el.taskModal.classList.remove('hidden');
+}
+
+function renderStepList(t) {
+  el.stepsContainer.innerHTML = '';
+  const steps = Array.isArray(t.steps) ? t.steps : [];
+  steps.forEach((step, idx) => {
+    const row = createEl('div', 'step-item');
+    const cb = document.createElement('input');
+    cb.type = 'checkbox';
+    cb.checked = !!step.done;
+    cb.addEventListener('change', () => {
+      step.done = cb.checked;
+      state.dirty = true;
+    });
+    row.appendChild(cb);
+    const txt = document.createElement('input');
+    txt.type = 'text';
+    txt.value = step.details || '';
+    txt.addEventListener('change', () => {
+      step.details = txt.value;
+      state.dirty = true;
+    });
+    row.appendChild(txt);
+    const del = document.createElement('button');
+    del.className = 'icon-btn';
+    del.textContent = '🗑';
+    del.title = '删除步骤';
+    del.addEventListener('click', () => {
+      t.steps.splice(idx, 1);
+      renderStepList(t);
+      state.dirty = true;
+    });
+    row.appendChild(del);
+    el.stepsContainer.appendChild(row);
+  });
+}
+
+function closeTaskModal() {
+  el.taskModal.classList.add('hidden');
+  state.selectedTaskId = null;
+}
+
+function saveTaskFromModal() {
+  const id = state.selectedTaskId;
+  const t = getTask(id);
+  if (!t) return;
+  const prev = deepClone(t);
+  t.title = el.taskTitleInput.value.trim() || t.title;
+  t.description = el.taskDescInput.value;
+  t.category = el.taskCategorySelect.value || null;
+  // steps already bound
+  state.dirty = true;
+  renderBoard();
+  logEvent('task-edit', { id, before: prev, after: t });
+  closeTaskModal();
+}
+
+function deleteTask() {
+  const id = state.selectedTaskId;
+  if (!id) return;
+  if (!confirm('删除该任务？此操作不可撤销')) return;
+  // remove from stages
+  state.board.stages.forEach((s) => {
+    s.tasks = (s.tasks || []).filter((tid) => tid !== id);
+  });
+  // remove task
+  const idx = idxById(state.board.tasks, id);
+  const prev = state.board.tasks[idx];
+  state.board.tasks.splice(idx, 1);
+  state.dirty = true;
+  logEvent('task-delete', { id, task: prev });
+  renderBoard();
+  closeTaskModal();
+}
+
+// ---- Stage CRUD ----
+function addStage() {
+  const title = prompt('阶段名称？');
+  if (!title) return;
+  let colIndex = 0;
+  if (state.board.layout.columns.length > 1) {
+    const ans = prompt(`放入第几列（1 - ${state.board.layout.columns.length}）？`, '1');
+    const n = Math.max(1, Math.min(Number(ans) || 1, state.board.layout.columns.length));
+    colIndex = n - 1;
+  }
+  const s = { uuid: uuidv4(), title: title.trim(), tasks: [] };
+  state.board.stages.push(s);
+  if (!state.board.layout.columns.length) state.board.layout.columns.push([]);
+  state.board.layout.columns[colIndex].push(s.uuid);
+  state.dirty = true;
+  renderBoard();
+  renderLayoutInfo();
+  logEvent('stage-add', { id: s.uuid, title: s.title, col: colIndex });
+}
+
+function renameStage(stageId) {
+  const s = getStage(stageId);
+  if (!s) return;
+  const title = prompt('新的阶段名称？', s.title || '');
+  if (!title) return;
+  const prev = s.title;
+  s.title = title.trim();
+  state.dirty = true;
+  renderBoard();
+  logEvent('stage-rename', { id: s.uuid, from: prev, to: s.title });
+}
+
+function deleteStage(stageId) {
+  const s = getStage(stageId);
+  if (!s) return;
+  if ((s.tasks || []).length) return alert('阶段非空，暂不支持删除非空阶段');
+  if (!confirm(`删除阶段“${s.title}”？`)) return;
+  state.board.stages = state.board.stages.filter((x) => x.uuid !== stageId);
+  // remove from layout columns
+  state.board.layout.columns = state.board.layout.columns.map((col) => col.filter((id) => id !== stageId));
+  state.dirty = true;
+  renderBoard();
+  renderLayoutInfo();
+  logEvent('stage-delete', { id: stageId });
+}
+
+function addColumn() {
+  if (!state.board.layout.columns) state.board.layout.columns = [];
+  state.board.layout.columns.push([]);
+  state.dirty = true;
+  renderBoard();
+  renderLayoutInfo();
+  logEvent('column-add', { count: state.board.layout.columns.length });
+}
+
+function moveStageToColumn(stageId) {
+  const cols = state.board.layout.columns;
+  if (!cols || !cols.length) return alert('暂无列');
+  const ans = prompt(`移动到第几列（1 - ${cols.length}）?`, '1');
+  let target = Math.max(1, Math.min(Number(ans) || 1, cols.length)) - 1;
+  // remove from any column first
+  cols.forEach((col, i) => {
+    const idx = col.indexOf(stageId);
+    if (idx !== -1) col.splice(idx, 1);
+  });
+  cols[target].push(stageId);
+  state.dirty = true;
+  renderBoard();
+  renderLayoutInfo();
+  logEvent('stage-move-column', { id: stageId, to: target });
+}
+
+// ---- Categories CRUD ----
+function addCategory() {
+  const title = prompt('类别名称？');
+  if (!title) return;
+  const color = prompt('颜色 hex（不含 #），例如 ff0000？', '70bafa') || '70bafa';
+  const c = { uuid: uuidv4(), title: title.trim(), color: color.replace(/#/g, '').slice(0, 6) };
+  state.board.categories.push(c);
+  state.dirty = true;
+  populateCategoryFilter();
+  renderCategories();
+  renderBoard();
+  logEvent('category-add', { id: c.uuid, title: c.title });
+}
+
+// ---- Import / Merge ----
+function idSet(arr) {
+  const s = new Set();
+  arr.forEach((x) => s.add(x.uuid));
+  return s;
+}
+
+function diffArrays(a, b) {
+  // arrays of ids
+  const sa = new Set(a);
+  const sb = new Set(b);
+  const added = b.filter((x) => !sa.has(x));
+  const removed = a.filter((x) => !sb.has(x));
+  const changedOrder = JSON.stringify(a) !== JSON.stringify(b);
+  return { added, removed, changedOrder };
+}
+
+function diffBoards(cur, imp) {
+  const diff = { tasks: {}, stages: {}, categories: {}, layout: { changed: false } };
+  // tasks
+  const curTasks = idSet(cur.tasks);
+  const impTasks = idSet(imp.tasks);
+  diff.tasks.added = imp.tasks.filter((t) => !curTasks.has(t.uuid)).map((t) => t.uuid);
+  diff.tasks.removed = cur.tasks.filter((t) => !impTasks.has(t.uuid)).map((t) => t.uuid);
+  diff.tasks.modified = [];
+  cur.tasks.forEach((t) => {
+    if (!impTasks.has(t.uuid)) return;
+    const it = imp.tasks.find((x) => x.uuid === t.uuid);
+    const fields = [];
+    if ((t.title || '') !== (it.title || '')) fields.push('title');
+    if ((t.description || '') !== (it.description || '')) fields.push('description');
+    if ((t.category || '') !== (it.category || '')) fields.push('category');
+    if (JSON.stringify(t.steps || []) !== JSON.stringify(it.steps || [])) fields.push('steps');
+    if (fields.length) diff.tasks.modified.push({ id: t.uuid, fields });
+  });
+
+  // categories
+  const curCats = idSet(cur.categories);
+  const impCats = idSet(imp.categories);
+  diff.categories.added = imp.categories.filter((c) => !curCats.has(c.uuid)).map((c) => c.uuid);
+  diff.categories.removed = cur.categories.filter((c) => !impCats.has(c.uuid)).map((c) => c.uuid);
+  diff.categories.modified = [];
+  cur.categories.forEach((c) => {
+    if (!impCats.has(c.uuid)) return;
+    const ic = imp.categories.find((x) => x.uuid === c.uuid);
+    const fields = [];
+    if ((c.title || '') !== (ic.title || '')) fields.push('title');
+    if ((c.color || '') !== (ic.color || '')) fields.push('color');
+    if (fields.length) diff.categories.modified.push({ id: c.uuid, fields });
+  });
+
+  // stages
+  const curStages = idSet(cur.stages);
+  const impStages = idSet(imp.stages);
+  diff.stages.added = imp.stages.filter((s) => !curStages.has(s.uuid)).map((s) => s.uuid);
+  diff.stages.removed = cur.stages.filter((s) => !impStages.has(s.uuid)).map((s) => s.uuid);
+  diff.stages.modified = [];
+  cur.stages.forEach((s) => {
+    if (!impStages.has(s.uuid)) return;
+    const is = imp.stages.find((x) => x.uuid === s.uuid);
+    const fields = [];
+    if ((s.title || '') !== (is.title || '')) fields.push('title');
+    const da = diffArrays(s.tasks || [], is.tasks || []);
+    if (da.added.length || da.removed.length || da.changedOrder) fields.push('tasks');
+    if (fields.length) diff.stages.modified.push({ id: s.uuid, fields });
+  });
+
+  // layout
+  diff.layout.changed = JSON.stringify(cur.layout || {}) !== JSON.stringify(imp.layout || {});
+
+  return diff;
+}
+
+function showMergePreview(imported, importedName = '导入文件') {
+  const cur = state.board || makeEmptyBoard();
+  const diff = diffBoards(cur, imported);
+  // Summary
+  el.diffSummary.innerHTML = '';
+  const items = [
+    { title: '任务新增', num: diff.tasks.added.length },
+    { title: '任务删除', num: diff.tasks.removed.length },
+    { title: '任务修改', num: diff.tasks.modified.length },
+    { title: '阶段新增', num: diff.stages.added.length },
+    { title: '阶段删除', num: diff.stages.removed.length },
+    { title: '阶段修改', num: diff.stages.modified.length },
+  ];
+  items.forEach((it) => {
+    const card = createEl('div', 'summary-card');
+    card.appendChild(createEl('h4', null, it.title));
+    card.appendChild(createEl('div', 'num', it.num));
+    el.diffSummary.appendChild(card);
+  });
+
+  // Details
+  const det = [];
+  det.push(`[文件] ${importedName}`);
+  det.push(`Tasks: +${diff.tasks.added.length} -${diff.tasks.removed.length} ~${diff.tasks.modified.length}`);
+  if (diff.tasks.added.length) det.push('  新增: ' + diff.tasks.added.join(', '));
+  if (diff.tasks.removed.length) det.push('  删除: ' + diff.tasks.removed.join(', '));
+  diff.tasks.modified.forEach((m) => det.push(`  修改: ${m.id} -> ${m.fields.join(', ')}`));
+  det.push(`Stages: +${diff.stages.added.length} -${diff.stages.removed.length} ~${diff.stages.modified.length}`);
+  if (diff.stages.added.length) det.push('  新增: ' + diff.stages.added.join(', '));
+  if (diff.stages.removed.length) det.push('  删除: ' + diff.stages.removed.join(', '));
+  diff.stages.modified.forEach((m) => det.push(`  修改: ${m.id} -> ${m.fields.join(', ')}`));
+  det.push(`Layout changed: ${diff.layout.changed}`);
+  el.diffDetails.textContent = det.join('\n');
+
+  // Save imported data holder on modal element
+  el.mergeModal.dataset.payload = JSON.stringify(imported);
+  el.mergeModal.classList.remove('hidden');
+}
+
+function closeMergeModal() {
+  el.mergeModal.classList.add('hidden');
+  el.mergeModal.dataset.payload = '';
+}
+
+function applyMerge() {
+  const imported = JSON.parse(el.mergeModal.dataset.payload || '{}');
+  if (!imported || !imported.tasks) return;
+  const policy = el.mergePolicy.value; // 'prefer-import' | 'prefer-current'
+  const removeMissing = el.mergeRemoveMissing.checked;
+
+  const cur = state.board;
+  const imp = imported;
+
+  // Merge categories
+  const curCatMap = Object.fromEntries(cur.categories.map((c) => [c.uuid, c]));
+  const impCatMap = Object.fromEntries(imp.categories.map((c) => [c.uuid, c]));
+  // add new
+  imp.categories.forEach((c) => {
+    if (!curCatMap[c.uuid]) cur.categories.push(deepClone(c));
+  });
+  // update existing
+  cur.categories.forEach((c) => {
+    const ic = impCatMap[c.uuid];
+    if (!ic) return;
+    if (policy === 'prefer-import') {
+      c.title = ic.title;
+      c.color = ic.color;
+    }
+  });
+  if (removeMissing) {
+    cur.categories = cur.categories.filter((c) => !!impCatMap[c.uuid]);
+  }
+
+  // Merge tasks
+  const curTaskMap = Object.fromEntries(cur.tasks.map((t) => [t.uuid, t]));
+  const impTaskMap = Object.fromEntries(imp.tasks.map((t) => [t.uuid, t]));
+  // add new
+  imp.tasks.forEach((t) => {
+    if (!curTaskMap[t.uuid]) cur.tasks.push(deepClone(t));
+  });
+  // update existing
+  cur.tasks.forEach((t) => {
+    const it = impTaskMap[t.uuid];
+    if (!it) return;
+    if (policy === 'prefer-import') {
+      t.title = it.title;
+      t.description = it.description;
+      t.category = it.category;
+      t.steps = deepClone(it.steps || []);
+    }
+  });
+  if (removeMissing) {
+    const keep = new Set(imp.tasks.map((t) => t.uuid));
+    cur.tasks = cur.tasks.filter((t) => keep.has(t.uuid));
+  }
+
+  // Merge stages
+  const curStageMap = Object.fromEntries(cur.stages.map((s) => [s.uuid, s]));
+  const impStageMap = Object.fromEntries(imp.stages.map((s) => [s.uuid, s]));
+  // add new
+  imp.stages.forEach((s) => {
+    if (!curStageMap[s.uuid]) cur.stages.push(deepClone(s));
+  });
+  // update existing
+  cur.stages.forEach((s) => {
+    const is = impStageMap[s.uuid];
+    if (!is) return;
+    if (policy === 'prefer-import') {
+      s.title = is.title;
+      s.tasks = deepClone(is.tasks || []);
+    }
+  });
+  if (removeMissing) {
+    const keep = new Set(imp.stages.map((s) => s.uuid));
+    cur.stages = cur.stages.filter((s) => keep.has(s.uuid));
+  }
+
+  // layout
+  if (policy === 'prefer-import') {
+    cur.layout = deepClone(imp.layout || { columns: [] });
+  }
+
+  state.dirty = true;
+  renderAll();
+  logEvent('merge-apply', { policy, removeMissing });
+  closeMergeModal();
+}
+
+// ---- Event wiring ----
+el.openFile.addEventListener('change', handleOpenFile);
+el.importFile.addEventListener('change', handleImportFile);
+el.saveBtn.addEventListener('click', handleSave);
+el.newBoardBtn.addEventListener('click', handleNewBoard);
+el.actorInput.addEventListener('change', () => {
+  if (!state.board?.meta) return;
+  state.board.meta.actor = el.actorInput.value.trim();
+  state.dirty = true;
+  updateFileStatus();
+});
+el.searchInput.addEventListener('input', renderBoard);
+el.categoryFilter.addEventListener('change', renderBoard);
+el.addCategoryBtn.addEventListener('click', addCategory);
+el.clearHistoryBtn.addEventListener('click', () => {
+  if (confirm('清空历史记录？将写入文件。')) {
+    state.board.meta.history = [];
+    state.board.meta.modifiedAt = nowIso();
+    state.dirty = true;
+    renderHistory();
+    logEvent('history-clear', {});
+  }
+});
+el.addStageBtn.addEventListener('click', addStage);
+el.addColumnBtn.addEventListener('click', addColumn);
+
+// Task modal events
+el.taskModalClose.addEventListener('click', closeTaskModal);
+el.addStepBtn.addEventListener('click', () => {
+  const t = getTask(state.selectedTaskId);
+  if (!t) return;
+  if (!Array.isArray(t.steps)) t.steps = [];
+  t.steps.push({ details: '新步骤', done: false });
+  state.dirty = true;
+  renderStepList(t);
+});
+el.taskSaveBtn.addEventListener('click', saveTaskFromModal);
+el.deleteTaskBtn.addEventListener('click', deleteTask);
+
+// Merge modal events
+el.mergeModalClose?.addEventListener('click', closeMergeModal);
+el.applyMergeBtn?.addEventListener('click', applyMerge);
+
+// Bootstrap
+bootstrapLoad();
diff --git a/config.json b/config.json
new file mode 100644
index 0000000..ed56c8e
--- /dev/null
+++ b/config.json
@@ -0,0 +1,6 @@
+{
+  "appTitle": "Kanban",
+  "defaultFilename": "kanban.json",
+  "autoLoadFile": ""  
+}
+
diff --git a/index.html b/index.html
new file mode 100644
index 0000000..ccb1c96
--- /dev/null
+++ b/index.html
@@ -0,0 +1,127 @@
+<!DOCTYPE html>
+<html lang="zh-CN">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title id="pageTitle">Kanban</title>
+    <link rel="stylesheet" href="styles.css" />
+  </head>
+  <body>
+    <header class="app-header">
+      <div class="left">
+        <h1 id="appTitle">Kanban</h1>
+        <span class="file-status" id="fileStatus">未加载文件</span>
+      </div>
+      <div class="right toolbar">
+        <label class="btn">
+          <input type="file" id="openFile" accept="application/json" hidden />
+          打开…
+        </label>
+        <button id="saveBtn" class="btn" title="导出当前板为 JSON">保存/导出</button>
+        <label class="btn">
+          <input type="file" id="importFile" accept="application/json" hidden />
+          导入/合并…
+        </label>
+        <button id="newBoardBtn" class="btn" title="新建看板">新建</button>
+        <span class="sep"></span>
+        <input id="actorInput" class="actor" placeholder="你的名字（用于记录历史）" />
+        <span class="sep"></span>
+        <input id="searchInput" class="search" placeholder="搜索任务…" />
+        <select id="categoryFilter" class="category-filter">
+          <option value="">筛选：全部类别</option>
+        </select>
+      </div>
+    </header>
+
+    <main class="app-main">
+      <aside class="side-panel">
+        <section>
+          <h3>类别</h3>
+          <div id="categoriesList" class="categories"></div>
+          <button id="addCategoryBtn" class="btn small">添加类别</button>
+        </section>
+        <section>
+          <h3>布局</h3>
+          <div id="layoutInfo" class="layout-info"></div>
+          <div style="display:flex; gap:6px; margin:6px 0;">
+            <button id="addStageBtn" class="btn small">添加阶段</button>
+            <button id="addColumnBtn" class="btn small">添加列</button>
+          </div>
+        </section>
+        <section>
+          <h3>历史</h3>
+          <div id="historyList" class="history"></div>
+          <button id="clearHistoryBtn" class="btn small">清空历史（写入文件）</button>
+        </section>
+      </aside>
+
+      <section class="board" id="board"></section>
+    </main>
+
+    <!-- 模态框：编辑任务 -->
+    <div class="modal hidden" id="taskModal" role="dialog" aria-modal="true">
+      <div class="modal-content">
+        <div class="modal-header">
+          <h2>编辑任务</h2>
+          <button class="icon-btn" id="taskModalClose" aria-label="关闭">✕</button>
+        </div>
+        <div class="modal-body">
+          <div class="form-row">
+            <label>标题</label>
+            <input id="taskTitleInput" />
+          </div>
+          <div class="form-row">
+            <label>类别</label>
+            <select id="taskCategorySelect"></select>
+          </div>
+          <div class="form-row">
+            <label>描述</label>
+            <textarea id="taskDescInput" rows="6"></textarea>
+          </div>
+          <div class="form-row">
+            <label>步骤</label>
+            <div id="stepsContainer" class="steps"></div>
+            <button id="addStepBtn" class="btn small">添加步骤</button>
+          </div>
+        </div>
+        <div class="modal-footer">
+          <button id="deleteTaskBtn" class="btn danger">删除</button>
+          <div class="spacer"></div>
+          <button id="taskSaveBtn" class="btn primary">保存</button>
+        </div>
+      </div>
+    </div>
+
+    <!-- 模态框：导入/合并 -->
+    <div class="modal hidden" id="mergeModal" role="dialog" aria-modal="true">
+      <div class="modal-content large">
+        <div class="modal-header">
+          <h2>导入/合并 预览</h2>
+          <button class="icon-btn" id="mergeModalClose" aria-label="关闭">✕</button>
+        </div>
+        <div class="modal-body">
+          <div class="form-row">
+            <label>策略</label>
+            <select id="mergePolicy">
+              <option value="prefer-import">冲突优先：导入文件</option>
+              <option value="prefer-current">冲突优先：当前看板</option>
+            </select>
+            <label class="checkbox">
+              <input type="checkbox" id="mergeRemoveMissing" /> 同步删除在导入文件中不存在的任务/阶段
+            </label>
+          </div>
+          <div class="diff-summary" id="diffSummary"></div>
+          <details>
+            <summary>详细变更</summary>
+            <div class="diff-details" id="diffDetails"></div>
+          </details>
+        </div>
+        <div class="modal-footer">
+          <button id="applyMergeBtn" class="btn primary">应用合并</button>
+        </div>
+      </div>
+    </div>
+
+    <script src="app.js"></script>
+  </body>
+  </html>
diff --git a/sample-board.json b/sample-board.json
new file mode 100644
index 0000000..2a5e5c9
--- /dev/null
+++ b/sample-board.json
@@ -0,0 +1,36 @@
+{
+  "categories": [
+    { "uuid": "c-urgent", "title": "Urgent", "color": "ff3b30" },
+    { "uuid": "c-normal", "title": "Normal", "color": "34c759" }
+  ],
+  "stages": [
+    { "uuid": "s-todo", "title": "Todo", "tasks": ["t-sample-1"] },
+    { "uuid": "s-doing", "title": "Doing", "tasks": [] },
+    { "uuid": "s-done", "title": "Done", "tasks": ["t-sample-2"] }
+  ],
+  "tasks": [
+    {
+      "uuid": "t-sample-1",
+      "title": "Example: Set up project",
+      "description": "Try adding a stage, a task, and drag it.",
+      "category": "c-normal",
+      "steps": [
+        { "details": "Create repository", "done": true },
+        { "details": "Add README", "done": false }
+      ]
+    },
+    {
+      "uuid": "t-sample-2",
+      "title": "Example: Celebrate",
+      "description": "Mark a task done to see step stats.",
+      "category": "c-urgent",
+      "steps": [
+        { "details": "Share with team", "done": true }
+      ]
+    }
+  ],
+  "layout": {
+    "columns": [["s-todo"], ["s-doing"], ["s-done"]]
+  }
+}
+
diff --git a/styles.css b/styles.css
new file mode 100644
index 0000000..c550d82
--- /dev/null
+++ b/styles.css
@@ -0,0 +1,129 @@
+:root {
+  --bg: #0f1115;
+  --panel: #161a22;
+  --panel-2: #1c2230;
+  --text: #e7e7ea;
+  --muted: #a5abb6;
+  --accent: #4cc2ff;
+  --danger: #ff5b5b;
+  --ok: #4caf50;
+  --card: #1b2230;
+  --border: #2a3242;
+  --shadow: 0 4px 12px rgba(0,0,0,0.3);
+}
+
+* { box-sizing: border-box; }
+html, body { height: 100%; }
+body {
+  margin: 0;
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen,
+    Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', 'Helvetica Neue', Arial,
+    'Noto Sans', 'PingFang SC', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif;
+  background: var(--bg);
+  color: var(--text);
+}
+
+.app-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  position: sticky;
+  top: 0;
+  z-index: 10;
+  background: var(--panel);
+  border-bottom: 1px solid var(--border);
+  padding: 8px 12px;
+}
+.app-header h1 { font-size: 18px; margin: 0 10px 0 0; }
+.file-status { color: var(--muted); font-size: 12px; }
+.left { display: flex; align-items: center; gap: 8px; }
+.toolbar { display: flex; align-items: center; gap: 8px; }
+.sep { width: 1px; height: 24px; background: var(--border); margin: 0 6px; }
+
+.btn {
+  cursor: pointer;
+  background: var(--panel-2);
+  color: var(--text);
+  border: 1px solid var(--border);
+  padding: 6px 10px;
+  border-radius: 6px;
+  box-shadow: var(--shadow);
+}
+.btn.small { padding: 4px 8px; font-size: 12px; }
+.btn.primary { background: var(--accent); color: #001525; border-color: #2a93c4; }
+.btn.danger { background: var(--danger); color: #1b0000; border-color: #a33939; }
+.icon-btn { cursor: pointer; background: transparent; color: var(--text); border: none; font-size: 16px; }
+
+input, select, textarea {
+  background: var(--panel-2);
+  color: var(--text);
+  border: 1px solid var(--border);
+  border-radius: 6px;
+  padding: 6px 8px;
+}
+.actor { width: 200px; }
+.search { width: 200px; }
+.category-filter { max-width: 220px; }
+
+.app-main { display: grid; grid-template-columns: 280px 1fr; height: calc(100vh - 56px); }
+.side-panel { overflow: auto; padding: 12px; border-right: 1px solid var(--border); background: var(--panel); }
+.side-panel h3 { margin: 14px 0 8px; font-size: 14px; color: var(--muted); font-weight: 600; }
+.categories { display: flex; flex-direction: column; gap: 6px; }
+.category-item { display: flex; align-items: center; gap: 6px; background: var(--panel-2); padding: 6px; border: 1px solid var(--border); border-radius: 6px; }
+.swatch { width: 14px; height: 14px; border-radius: 4px; border: 1px solid #00000033; display: inline-block; }
+.category-item input[type="text"] { flex: 1; }
+.layout-info { font-size: 12px; color: var(--muted); line-height: 1.6; }
+.history { font-size: 12px; display: flex; flex-direction: column; gap: 8px; }
+.history .event { padding: 6px 8px; background: var(--panel-2); border: 1px solid var(--border); border-radius: 6px; }
+
+.board {
+  overflow: auto;
+  padding: 12px;
+  display: grid;
+  grid-auto-rows: 1fr;
+  grid-auto-flow: column;
+  gap: 12px;
+}
+.board-column { display: flex; flex-direction: column; gap: 12px; min-width: 320px; }
+.stage { background: var(--panel); border: 1px solid var(--border); border-radius: 10px; display: flex; flex-direction: column; }
+.stage-header { display: flex; align-items: center; justify-content: space-between; padding: 8px 10px; border-bottom: 1px solid var(--border); }
+.stage-title { font-weight: 600; }
+.stage-actions { display: flex; align-items: center; gap: 6px; }
+.task-list { padding: 8px; display: flex; flex-direction: column; gap: 8px; min-height: 60px; }
+.task-list.drag-over { outline: 2px dashed var(--accent); outline-offset: -4px; border-radius: 6px; }
+
+.task { background: var(--card); border: 1px solid var(--border); border-radius: 8px; padding: 8px; box-shadow: var(--shadow); display: grid; grid-template-columns: 20px 1fr auto; align-items: center; gap: 8px; }
+.task .grab { cursor: grab; user-select: none; opacity: 0.8; }
+.task .title { font-weight: 600; }
+.task .meta { font-size: 12px; color: var(--muted); }
+.task .chip { font-size: 11px; padding: 2px 6px; border-radius: 10px; border: 1px solid #00000033; white-space: nowrap; }
+.task .actions { display: flex; gap: 4px; }
+
+.modal { position: fixed; inset: 0; background: rgba(0,0,0,0.6); display: flex; align-items: center; justify-content: center; padding: 16px; }
+.modal.hidden { display: none; }
+.modal-content { background: var(--panel); border: 1px solid var(--border); border-radius: 10px; width: 720px; max-width: 95vw; max-height: 90vh; display: flex; flex-direction: column; }
+.modal-content.large { width: 1000px; }
+.modal-header { display: flex; align-items: center; justify-content: space-between; padding: 10px 12px; border-bottom: 1px solid var(--border); }
+.modal-body { padding: 12px; overflow: auto; }
+.modal-footer { display: flex; align-items: center; gap: 8px; padding: 10px 12px; border-top: 1px solid var(--border); }
+.spacer { flex: 1; }
+
+.form-row { display: grid; grid-template-columns: 90px 1fr; align-items: start; gap: 10px; margin-bottom: 10px; }
+.form-row label { font-size: 12px; color: var(--muted); padding-top: 6px; }
+.steps { display: flex; flex-direction: column; gap: 6px; }
+.step-item { display: grid; grid-template-columns: 24px 1fr 24px; align-items: center; gap: 8px; }
+.step-item input[type="text"] { width: 100%; }
+.checkbox { display: inline-flex; align-items: center; gap: 6px; margin-left: 12px; }
+
+.diff-summary { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; margin-bottom: 10px; }
+.summary-card { background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px; padding: 8px; }
+.summary-card h4 { margin: 2px 0 8px; font-size: 13px; color: var(--muted); }
+.summary-card .num { font-size: 22px; font-weight: 700; }
+.diff-details { display: flex; flex-direction: column; gap: 8px; }
+.diff-item { background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px; padding: 6px 8px; font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace; font-size: 12px; white-space: pre-wrap; }
+
+@media (max-width: 1200px) {
+  .app-main { grid-template-columns: 1fr; }
+  .side-panel { display: none; }
+}
+