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v6_軽量KanbanBoard/app.js

@@ -1,1413 +1,1545 @@
-
-(() => {
-  "use strict";
-
-  const STORAGE_KEY = "toyota-kanban-tasks-v1";
-  const SETTINGS_KEY = "toyota-kanban-settings-v1";
-  const DEFAULT_TITLE = "トヨタ式カンバンボード";
-  const PANEL_KEYS = ["analytics", "filters", "form"];
-
-  const columnSettings = {
-    backlog: { wip: Number.POSITIVE_INFINITY, label: "バックログ" },
-    ready: { wip: 5, label: "準備中" },
-    inProgress: { wip: 3, label: "仕掛中" },
-    waiting: { wip: 2, label: "停止中" },
-    done: { wip: Number.POSITIVE_INFINITY, label: "完了" }
-  };
-
-  const form = document.getElementById("task-form");
-  const fields = {
-    title: document.getElementById("task-title"),
-    owner: document.getElementById("task-owner"),
-    due: document.getElementById("task-due"),
-    status: document.getElementById("task-status"),
-    notes: document.getElementById("task-notes"),
-    tags: document.getElementById("task-tags"),
-    link: document.getElementById("task-link")
-  };
-  const messageArea = document.getElementById("message-area");
-  const seedButton = document.getElementById("seed-demo");
-  const template = document.getElementById("task-template");
-  const dropzones = Array.from(document.querySelectorAll("[data-dropzone]"));
-  const counters = Array.from(document.querySelectorAll("[data-counter]"));
-  const metricElements = {
-    total: document.querySelector("[data-metric=\"total\"]"),
-    active: document.querySelector("[data-metric=\"active\"]"),
-    throughput7: document.querySelector("[data-metric=\"throughput7\"]"),
-    leadtime: document.querySelector("[data-metric=\"leadtime\"]")
-  };
-  const editDialog = document.getElementById("edit-dialog");
-  const editForm = document.getElementById("edit-form");
-  const editFields = editForm
-    ? {
-        title: document.getElementById("edit-title"),
-        owner: document.getElementById("edit-owner"),
-        due: document.getElementById("edit-due"),
-        notes: document.getElementById("edit-notes"),
-        tags: document.getElementById("edit-tags"),
-        link: document.getElementById("edit-link")
-      }
-    : null;
-
-  const boardTitleHeading = document.getElementById("board-title-heading");
-  const titleEditButton = document.getElementById("title-edit");
-  const panelSections = Array.from(document.querySelectorAll("[data-panel]"));
-  const panels = new Map(panelSections.map((section) => [section.dataset.panel, section]));
-  const panelToggleButtons = Array.from(document.querySelectorAll("[data-action=\"toggle-panel\"]"));
-
-  const filterElements = {
-    keyword: document.getElementById("filter-keyword"),
-    dueStart: document.getElementById("filter-due-start"),
-    dueEnd: document.getElementById("filter-due-end"),
-    clear: document.getElementById("filter-clear"),
-    tagList: document.getElementById("filter-tag-list")
-  };
-  const selectionElements = {
-    counter: document.getElementById("selection-counter"),
-    hint: document.getElementById("selection-hint"),
-    selectAll: document.getElementById("selection-selectall"),
-    clear: document.getElementById("selection-clear"),
-    delete: document.getElementById("selection-delete")
-  };
-  const uiElements = {
-    viewToggle: document.getElementById("view-toggle")
-  };
-
-  const filterState = {
-    keyword: "",
-    dueStart: "",
-    dueEnd: "",
-    tags: new Set()
-  };
-
-  const selectionState = {
-    ids: new Set(),
-    lastVisibleIds: []
-  };
-
-  const uiState = {
-    compact: false
-  };
-
-  let settings = createDefaultSettings();
-  let tasks = [];
-  let messageTimer = null;
-  let draggingTaskId = null;
-  let editingTaskId = null;
-
-  init();
-
-  function createDefaultSettings() {
-    return {
-      title: DEFAULT_TITLE,
-      panels: PANEL_KEYS.reduce((acc, key) => {
-        acc[key] = false;
-        return acc;
-      }, {})
-    };
-  }
-
-  function init() {
-    loadSettings();
-    applyTitle();
-    applyPanelStates({ initial: true });
-    loadFromStorage();
-    attachFormEvents();
-    attachDropzoneEvents();
-    attachSeedButton();
-    attachEditForm();
-    attachFilterHandlers();
-    attachSelectionHandlers();
-    attachViewHandlers();
-    attachPanelHandlers();
-    attachTitleEditor();
-    form?.addEventListener("reset", () => hideMessage());
-    updateViewToggleLabel();
-    updateSelectionUI();
-    render();
-  }
-
-  function loadSettings() {
-    try {
-      const raw = window.localStorage.getItem(SETTINGS_KEY);
-      if (raw) {
-        const parsed = JSON.parse(raw);
-        if (parsed && typeof parsed === "object") {
-          settings = {
-            title: typeof parsed.title === "string" && parsed.title.trim() ? parsed.title.trim() : DEFAULT_TITLE,
-            panels: { ...createDefaultSettings().panels, ...(parsed.panels || {}) }
-          };
-          return;
-        }
-      }
-    } catch (error) {
-      console.warn("Failed to load settings:", error);
-    }
-    settings = createDefaultSettings();
-  }
-
-  function saveSettings() {
-    try {
-      window.localStorage.setItem(SETTINGS_KEY, JSON.stringify(settings));
-    } catch (error) {
-      console.warn("Failed to save settings:", error);
-    }
-  }
-
-  function applyTitle() {
-    if (boardTitleHeading) {
-      boardTitleHeading.textContent = settings.title;
-    }
-    document.title = settings.title;
-  }
-
-  function attachTitleEditor() {
-    titleEditButton?.addEventListener("click", handleTitleEdit);
-  }
-
-  function handleTitleEdit() {
-    const current = settings.title || DEFAULT_TITLE;
-    const next = window.prompt("ボードタイトルを入力してください。", current);
-    if (next === null) return;
-    const trimmed = next.trim();
-    settings.title = trimmed || DEFAULT_TITLE;
-    applyTitle();
-    saveSettings();
-    showMessage("タイトルを更新しました。", "info");
-  }
-
-  function attachPanelHandlers() {
-    panelToggleButtons.forEach((button) => {
-      button.addEventListener("click", () => {
-        const key = button.dataset.target;
-        const section = panels.get(key);
-        if (!key || !section) return;
-        const willCollapse = !section.classList.contains("panel-collapsed");
-        setPanelCollapsed(key, willCollapse);
-      });
-    });
-  }
-
-  function applyPanelStates({ initial = false } = {}) {
-    PANEL_KEYS.forEach((key) => {
-      const collapsed = Boolean(settings.panels[key]);
-      setPanelCollapsed(key, collapsed, { save: !initial });
-    });
-  }
-  function setPanelCollapsed(panelKey, collapsed, { save = true } = {}) {
-    const section = panels.get(panelKey);
-    if (!section) return;
-    section.classList.toggle("panel-collapsed", collapsed);
-    const body = section.querySelector(`[data-panel-body="${panelKey}"]`);
-    if (body) {
-      body.hidden = collapsed;
-    }
-    updatePanelButton(panelKey, collapsed);
-    settings.panels[panelKey] = collapsed;
-    if (save) {
-      saveSettings();
-    }
-  }
-
-  function updatePanelButton(panelKey, collapsed) {
-    const button = panelToggleButtons.find((item) => item.dataset.target === panelKey);
-    if (!button) return;
-    button.textContent = collapsed ? "展開する" : "折りたたむ";
-    button.setAttribute("aria-expanded", collapsed ? "false" : "true");
-  }
-
-  function attachFormEvents() {
-    form?.addEventListener("submit", handleSubmit);
-  }
-
-  function handleSubmit(event) {
-    event.preventDefault();
-    const rawTitle = fields.title.value.trim();
-    const rawOwner = fields.owner.value.trim();
-    const rawNotes = fields.notes.value.trim();
-    const status = fields.status.value;
-    const due = fields.due.value;
-    const tags = parseTags(fields.tags?.value ?? "");
-    const link = normalizeLink(fields.link?.value ?? "");
-
-    if (!rawTitle) {
-      showMessage("タイトルを入力してください。", "warn");
-      fields.title.focus();
-      return;
-    }
-
-    if (!canEnterColumn(status)) {
-      const limit = columnSettings[status]?.wip;
-      const label = columnSettings[status]?.label ?? status;
-      showMessage(`「${label}」はWIP上限（${limit}）を超えられません。`, "warn");
-      return;
-    }
-
-    const now = new Date();
-    const newTask = {
-      id: createId(),
-      title: rawTitle,
-      owner: rawOwner,
-      due,
-      notes: rawNotes,
-      status,
-      link,
-      createdAt: now.toISOString(),
-      tags
-    };
-
-    if (status === "done") {
-      newTask.completedAt = now.toISOString();
-    }
-
-    tasks.push(newTask);
-    persist();
-    render();
-    form.reset();
-    fields.title.focus();
-    showMessage("タスクを登録しました。", "info");
-  }
-
-  function attachDropzoneEvents() {
-    dropzones.forEach((zone) => {
-      zone.addEventListener("dragover", handleDragOver);
-      zone.addEventListener("dragleave", handleDragLeave);
-      zone.addEventListener("drop", handleDrop);
-    });
-  }
-
-  function attachSeedButton() {
-    seedButton?.addEventListener("click", seedDemoData);
-  }
-
-  function attachEditForm() {
-    if (!editForm || !editDialog || !editFields) return;
-
-    editForm.addEventListener("submit", handleEditSubmit);
-    const cancelButton = editForm.querySelector("[data-action=\"cancel-edit\"]");
-    cancelButton?.addEventListener("click", () => closeEditDialog());
-
-    editDialog.addEventListener("cancel", () => closeEditDialog(true));
-    editDialog.addEventListener("close", () => resetEditingState());
-  }
-
-  function attachFilterHandlers() {
-    filterElements.keyword?.addEventListener("input", handleKeywordFilter);
-    filterElements.dueStart?.addEventListener("change", handleDueFilter);
-    filterElements.dueEnd?.addEventListener("change", handleDueFilter);
-    filterElements.clear?.addEventListener("click", clearFilters);
-    filterElements.tagList?.addEventListener("click", handleTagFilterClick);
-  }
-
-  function attachSelectionHandlers() {
-    selectionElements.selectAll?.addEventListener("click", selectAllVisible);
-    selectionElements.clear?.addEventListener("click", () => {
-      clearSelection();
-      syncSelectionCheckboxes();
-    });
-    selectionElements.delete?.addEventListener("click", deleteSelectedTasks);
-  }
-
-  function attachViewHandlers() {
-    uiElements.viewToggle?.addEventListener("click", toggleViewMode);
-  }
-
-  function handleKeywordFilter(event) {
-    filterState.keyword = event.target.value.trim();
-    render();
-  }
-
-  function handleDueFilter() {
-    filterState.dueStart = filterElements.dueStart?.value ?? "";
-    filterState.dueEnd = filterElements.dueEnd?.value ?? "";
-    render();
-  }
-
-  function handleTagFilterClick(event) {
-    const button = event.target.closest("[data-tag-value]");
-    if (!button) return;
-    const tag = button.dataset.tagValue;
-    if (!tag) return;
-
-    if (filterState.tags.has(tag)) {
-      filterState.tags.delete(tag);
-    } else {
-      filterState.tags.add(tag);
-    }
-    render();
-  }
-
-  function clearFilters() {
-    filterState.keyword = "";
-    filterState.dueStart = "";
-    filterState.dueEnd = "";
-    filterState.tags.clear();
-    if (filterElements.keyword) {
-      filterElements.keyword.value = "";
-    }
-    if (filterElements.dueStart) {
-      filterElements.dueStart.value = "";
-    }
-    if (filterElements.dueEnd) {
-      filterElements.dueEnd.value = "";
-    }
-    render();
-  }
-
-  function handleDragStart(event) {
-    const card = event.currentTarget;
-    const taskId = card.dataset.taskId;
-    if (!taskId) return;
-    draggingTaskId = taskId;
-    event.dataTransfer.effectAllowed = "move";
-    event.dataTransfer.setData("text/plain", taskId);
-    card.classList.add("opacity-40");
-  }
-
-  function handleDragEnd(event) {
-    event.currentTarget.classList.remove("opacity-40");
-    draggingTaskId = null;
-    dropzones.forEach((zone) => setDropzoneHighlight(zone, "none"));
-  }
-
-  function handleDragOver(event) {
-    event.preventDefault();
-    const zone = event.currentTarget;
-    const targetColumn = zone.dataset.dropzone;
-    const allowed = canEnterColumn(targetColumn, draggingTaskId);
-    event.dataTransfer.dropEffect = allowed ? "move" : "none";
-    setDropzoneHighlight(zone, allowed ? "allowed" : "denied");
-  }
-
-  function handleDragLeave(event) {
-    setDropzoneHighlight(event.currentTarget, "none");
-  }
-
-  function handleDrop(event) {
-    event.preventDefault();
-    const zone = event.currentTarget;
-    const targetColumn = zone.dataset.dropzone;
-    const taskId = draggingTaskId || event.dataTransfer.getData("text/plain");
-
-    setDropzoneHighlight(zone, "none");
-
-    if (!taskId) return;
-
-    if (!canEnterColumn(targetColumn, taskId)) {
-      const limit = columnSettings[targetColumn]?.wip;
-      const label = columnSettings[targetColumn]?.label ?? targetColumn;
-      showMessage(`「${label}」はWIP上限（${limit}）を超えられません。`, "warn");
-      return;
-    }
-
-    moveTask(taskId, targetColumn);
-  }
-
-  function moveTask(taskId, targetColumn) {
-    const task = tasks.find((item) => item.id === taskId);
-    if (!task || task.status === targetColumn) return;
-
-    task.status = targetColumn;
-    if (targetColumn === "done") {
-      task.completedAt = new Date().toISOString();
-    }
-
-    persist();
-    render();
-    showMessage(`タスクを「${columnSettings[targetColumn]?.label ?? targetColumn}」へ移動しました。`, "info");
-  }
-
-  function render() {
-    cleanupSelection();
-    renderTagFilters();
-
-    const filterActive = isFilterActive();
-    const filteredTasks = getFilteredTasks();
-    const tasksToRender = filterActive ? filteredTasks : tasks;
-
-    selectionState.lastVisibleIds = tasksToRender.map((task) => task.id);
-
-    dropzones.forEach((zone) => zone.replaceChildren());
-
-    const byColumn = new Map();
-    tasksToRender
-      .slice()
-      .sort((a, b) => new Date(a.createdAt || 0).getTime() - new Date(b.createdAt || 0).getTime())
-      .forEach((task) => {
-        const list = byColumn.get(task.status) ?? [];
-        list.push(task);
-        byColumn.set(task.status, list);
-      });
-
-    dropzones.forEach((zone) => {
-      const columnKey = zone.dataset.dropzone;
-      const columnTasks = byColumn.get(columnKey) ?? [];
-      columnTasks.forEach((task) => zone.appendChild(buildTaskCard(task)));
-      if (!zone.childElementCount) {
-        zone.appendChild(createEmptyState(filterActive));
-      }
-    });
-
-    updateCounters(filterActive, filteredTasks);
-    renderMetrics(filteredTasks, filterActive);
-    syncSelectionCheckboxes();
-    updateSelectionUI();
-  }
-  function buildTaskCard(task) {
-    const fragment = template.content.cloneNode(true);
-    const card = fragment.querySelector("[data-task-id]");
-    card.dataset.taskId = task.id;
-
-    const isSelected = selectionState.ids.has(task.id);
-    card.classList.toggle("kanban-card-selected", isSelected);
-
-
-
-    const titleEl = card.querySelector("[data-field=\"title\"]");
-    const ownerEl = card.querySelector("[data-field=\"owner\"]");
-    const dueEl = card.querySelector("[data-field=\"due\"]");
-    const notesEl = card.querySelector("[data-field=\"notes\"]");
-    const tagsEl = card.querySelector("[data-field=\"tags\"]");
-    const tagsSection = card.querySelector("[data-section=\"tags\"]");
-    const linkSection = card.querySelector("[data-section=\"link\"]");
-    const linkEl = card.querySelector("[data-field=\"link\"]");
-    const doneButton = card.querySelector("[data-action=\"mark-done\"]");
-    const editButton = card.querySelector("[data-action=\"edit-task\"]");
-    const deleteButton = card.querySelector("[data-action=\"delete-task\"]");
-    const checkbox = card.querySelector("[data-action=\"select-task\"]");
-    const toggleDetailsButton = card.querySelector("[data-action=\"toggle-details\"]");
-
-    titleEl.textContent = task.title;
-    ownerEl.textContent = task.owner || "未設定";
-    dueEl.textContent = formatDue(task.due);
-    notesEl.textContent = task.notes || "メモなし";
-    notesEl.classList.toggle("text-slate-500", !task.notes);
-
-    if (tagsEl) {
-      tagsEl.replaceChildren();
-      const hasTags = Array.isArray(task.tags) && task.tags.length > 0;
-      tagsSection?.classList.toggle("hidden", !hasTags);
-      tagsSection?.setAttribute("aria-hidden", hasTags ? "false" : "true");
-      tagsSection?.setAttribute("data-has-tags", hasTags ? "true" : "false");
-      if (hasTags) {
-        task.tags.forEach((tag) => {
-          const pill = document.createElement("span");
-          pill.textContent = `#${tag}`;
-          pill.className = buildTagPillClass(filterState.tags.has(tag));
-          tagsEl.appendChild(pill);
-        });
-      }
-    }
-
-    if (linkSection && linkEl) {
-      if (task.link) {
-        linkSection.classList.remove("hidden");
-        linkEl.href = task.link;
-        linkEl.textContent = formatLinkLabel(task.link);
-        linkEl.title = task.link;
-      } else {
-        linkSection.classList.add("hidden");
-        linkEl.removeAttribute("href");
-        linkEl.removeAttribute("title");
-        linkEl.textContent = "";
-      }
-    }
-
-    if (checkbox) {
-      checkbox.checked = isSelected;
-      checkbox.addEventListener("click", (event) => event.stopPropagation());
-      checkbox.addEventListener("mousedown", (event) => event.stopPropagation());
-      checkbox.addEventListener("change", (event) => toggleSelection(task.id, event.target.checked));
-    }
-
-    if (doneButton) {
-      const isDone = task.status === "done";
-      doneButton.classList.toggle("hidden", isDone);
-      doneButton.addEventListener("click", (event) => {
-        event.preventDefault();
-        event.stopPropagation();
-        moveTask(task.id, "done");
-      });
-    }
-
-    editButton?.addEventListener("click", (event) => {
-      event.preventDefault();
-      event.stopPropagation();
-      openEditDialog(task.id);
-    });
-    deleteButton?.addEventListener("click", (event) => {
-      event.preventDefault();
-      event.stopPropagation();
-      deleteTask(task.id);
-    });
-
-    if (toggleDetailsButton) {
-      toggleDetailsButton.addEventListener("click", (event) => {
-        event.preventDefault();
-        event.stopPropagation();
-        card.classList.toggle("kanban-card-expanded");
-        updateCardDetailVisibility(card);
-      });
-    }
-
-    card.addEventListener("dragstart", handleDragStart);
-    card.addEventListener("dragend", handleDragEnd);
-
-    applyCardLayout(card);
-
-    return card;
-  }
-
-  function applyCardLayout(card) {
-    if (!card) return;
-    card.classList.toggle("kanban-card-compact", uiState.compact);
-    if (!uiState.compact) {
-      card.classList.remove("kanban-card-expanded");
-    }
-    updateCardDetailVisibility(card);
-  }
-
-  function updateCardDetailVisibility(card) {
-    const isExpanded = card.classList.contains("kanban-card-expanded");
-    const showDetails = !uiState.compact || isExpanded;
-
-    const meta = card.querySelector("[data-section=\"meta\"]");
-    const notes = card.querySelector("[data-section=\"notes\"]");
-    const tags = card.querySelector("[data-section=\"tags\"]");
-    const toggleDetailsButton = card.querySelector("[data-action=\"toggle-details\"]");
-
-    if (meta) {
-      meta.classList.toggle("hidden", !showDetails);
-    }
-    if (notes) {
-      notes.classList.toggle("hidden", !showDetails);
-      notes.classList.toggle("kanban-note-clamped", uiState.compact && !isExpanded);
-    }
-
-    if (tags) {
-      const hasTags = tags && tags.getAttribute("data-has-tags") === "true";
-      if (hasTags) {
-        tags.classList.toggle("hidden", !showDetails);
-      }
-    }
-    if (toggleDetailsButton) {
-      const hasDetails = Boolean((meta && meta.textContent.trim()) || (notes && notes.textContent.trim() && notes.textContent.trim() !== "メモなし"));
-      const shouldShowToggle = uiState.compact && hasDetails;
-      toggleDetailsButton.classList.toggle("invisible", !shouldShowToggle);
-      toggleDetailsButton.classList.toggle("pointer-events-none", !shouldShowToggle);
-      toggleDetailsButton.textContent = isExpanded ? "折りたた��" : "詳細";
-      toggleDetailsButton.setAttribute("aria-expanded", isExpanded ? "true" : "false");
-    }
-  }
-
-  function createEmptyState(filterActive) {
-    const empty = document.createElement("p");
-    empty.className = "rounded-lg border border-dashed border-slate-600/60 px-3 py-6 text-center text-xs text-slate-500";
-    empty.textContent = filterActive ? "該当するカードがありません" : "カードなし";
-    empty.setAttribute("aria-hidden", "true");
-    return empty;
-  }
-
-  function updateCounters(filterActive, filteredTasks) {
-    counters.forEach((counter) => {
-      const columnKey = counter.dataset.counter;
-      const totalCount = tasks.filter((task) => task.status === columnKey).length;
-      const visibleCount = filterActive
-        ? filteredTasks.filter((task) => task.status === columnKey).length
-        : totalCount;
-
-      counter.textContent = filterActive ? `${visibleCount}/${totalCount}` : String(totalCount);
-
-      const parentArticle = counter.closest("article");
-      if (!parentArticle) return;
-
-      const limit = columnSettings[columnKey]?.wip;
-      const isLimited = Number.isFinite(limit);
-      parentArticle.classList.remove("border", "border-kanban-caution");
-      if (isLimited && totalCount >= limit) {
-        parentArticle.classList.add("border", "border-kanban-caution");
-      }
-    });
-  }
-
-  function renderMetrics(filteredTasks, filterActive) {
-    const activeStatuses = new Set(["ready", "inProgress", "waiting"]);
-
-    const visibleTasks = filterActive ? filteredTasks : tasks;
-    const totalTasks = tasks.length;
-    const visibleTotal = visibleTasks.length;
-
-    const totalDisplay = filterActive
-      ? formatFilteredCount(visibleTotal, totalTasks)
-      : formatCount(totalTasks);
-
-    const totalActive = tasks.filter((task) => activeStatuses.has(task.status)).length;
-    const visibleActive = visibleTasks.filter((task) => activeStatuses.has(task.status)).length;
-    const activeDisplay = filterActive
-      ? formatFilteredCount(visibleActive, totalActive)
-      : formatCount(totalActive);
-
-    const now = new Date();
-    const sevenDaysAgo = new Date(now);
-    sevenDaysAgo.setDate(now.getDate() - 7);
-
-    const totalDone = tasks.filter((task) => task.status === "done");
-    const visibleDone = visibleTasks.filter((task) => task.status === "done");
-
-    const totalThroughput7 = totalDone.filter((task) => isCompletedSince(task, sevenDaysAgo)).length;
-    const visibleThroughput7 = visibleDone.filter((task) => isCompletedSince(task, sevenDaysAgo)).length;
-    const throughputDisplay = filterActive
-      ? formatFilteredCount(visibleThroughput7, totalThroughput7)
-      : formatCount(totalThroughput7);
-
-    const totalLeadAvg = computeAverageLead(totalDone);
-    const visibleLeadAvg = computeAverageLead(visibleDone);
-    const leadDisplay = filterActive
-      ? formatLeadFiltered(visibleLeadAvg, totalLeadAvg)
-      : formatLeadFiltered(totalLeadAvg, null);
-
-    setMetric("total", totalDisplay);
-    setMetric("active", activeDisplay);
-    setMetric("throughput7", throughputDisplay);
-    setMetric("leadtime", leadDisplay);
-  }
-
-  function computeAverageLead(doneTasks) {
-    const leadTimes = doneTasks
-      .map((task) => computeLeadTimeDays(task))
-      .filter((value) => Number.isFinite(value));
-    if (!leadTimes.length) return null;
-    const total = leadTimes.reduce((sum, value) => sum + value, 0);
-    return total / leadTimes.length;
-  }
-
-  function formatLeadFiltered(primary, overall) {
-    const base = Number.isFinite(primary) ? `${primary.toFixed(1)}日` : "--";
-    if (overall === null || overall === undefined) {
-      return base;
-    }
-    const overallText = Number.isFinite(overall) ? `${overall.toFixed(1)}日` : "--";
-    return `${base} / 全${overallText}`;
-  }
-
-  function setMetric(key, text) {
-    const target = metricElements[key];
-    if (!target) return;
-    target.textContent = text;
-  }
-
-  function formatCount(count) {
-    return `${count}枚`;
-  }
-
-  function formatFilteredCount(visible, total) {
-    return `${formatCount(visible)} / 全${formatCount(total)}`;
-  }
-
-  function isCompletedSince(task, threshold) {
-    if (!task.completedAt) return false;
-    const completed = new Date(task.completedAt);
-    return !Number.isNaN(completed.getTime()) && completed >= threshold;
-  }
-
-  function computeLeadTimeDays(task) {
-    if (!task?.createdAt || !task?.completedAt) return Number.NaN;
-    const start = new Date(task.createdAt);
-    const end = new Date(task.completedAt);
-    if (Number.isNaN(start.getTime()) || Number.isNaN(end.getTime())) return Number.NaN;
-    const diffMs = end.getTime() - start.getTime();
-    if (diffMs < 0) return Number.NaN;
-    return diffMs / (1000 * 60 * 60 * 24);
-  }
-
-  function setDropzoneHighlight(zone, state) {
-    zone.classList.remove("ring-2", "ring-offset-2", "ring-offset-slate-900", "ring-kanban-accent", "ring-kanban-caution", "bg-slate-800/40", "bg-slate-900/40");
-    if (state === "allowed") {
-      zone.classList.add("ring-2", "ring-offset-2", "ring-offset-slate-900", "ring-kanban-accent", "bg-slate-800/40");
-    } else if (state === "denied") {
-      zone.classList.add("ring-2", "ring-offset-2", "ring-offset-slate-900", "ring-kanban-caution", "bg-slate-900/40");
-    }
-  }
-
-  function canEnterColumn(columnKey, movingTaskId) {
-    const settingsColumn = columnSettings[columnKey];
-    if (!settingsColumn) return true;
-    if (!Number.isFinite(settingsColumn.wip)) return true;
-    const current = tasks.filter((task) => task.status === columnKey && task.id !== movingTaskId).length;
-    return current < settingsColumn.wip;
-  }
-
-  function isFilterActive() {
-    return (
-      Boolean(filterState.keyword) ||
-      Boolean(filterState.dueStart) ||
-      Boolean(filterState.dueEnd) ||
-      filterState.tags.size > 0
-    );
-  }
-
-  function getFilteredTasks() {
-    if (!isFilterActive()) return tasks;
-    const keyword = filterState.keyword.toLowerCase();
-    const startDate = parseISODate(filterState.dueStart);
-    const endDate = parseISODate(filterState.dueEnd);
-
-    return tasks.filter((task) => {
-      const keywordMatch = keyword
-        ? [task.title, task.owner, task.notes, task.due]
-            .filter(Boolean)
-            .some((value) => String(value).toLowerCase().includes(keyword))
-        : true;
-
-      const tagsMatch = filterState.tags.size
-        ? [...filterState.tags].every((tag) => Array.isArray(task.tags) && task.tags.includes(tag))
-        : true;
-
-      const dueMatch = (() => {
-        if (!startDate && !endDate) return true;
-        if (!task.due) return false;
-        const dueDate = parseISODate(task.due);
-        if (!dueDate) return false;
-        if (startDate && dueDate < startDate) return false;
-        if (endDate && dueDate > endDate) return false;
-        return true;
-      })();
-
-      return keywordMatch && tagsMatch && dueMatch;
-    });
-  }
-
-  function renderTagFilters() {
-    if (!filterElements.tagList) return;
-
-    const keyword = filterState.keyword.trim().toLowerCase();
-    const startDate = parseISODate(filterState.dueStart);
-    const endDate = parseISODate(filterState.dueEnd);
-
-    const sourceTasks = tasks.filter((task) => {
-      const keywordMatch = keyword
-        ? [task.title, task.owner, task.notes, task.due]
-            .filter(Boolean)
-            .some((value) => String(value).toLowerCase().includes(keyword))
-        : true;
-
-      const dueMatch = (() => {
-        if (!startDate && !endDate) return true;
-        if (!task.due) return false;
-        const dueDate = parseISODate(task.due);
-        if (!dueDate) return false;
-        if (startDate && dueDate < startDate) return false;
-        if (endDate && dueDate > endDate) return false;
-        return true;
-      })();
-
-      return keywordMatch && dueMatch;
-    });
-
-    const allTags = Array.from(
-      new Set(
-        sourceTasks
-          .flatMap((task) => (Array.isArray(task.tags) ? task.tags : []))
-          .map((tag) => tag.trim())
-          .filter(Boolean)
-      )
-    ).sort((a, b) => a.localeCompare(b, 'ja'));
-
-    const validTags = new Set(allTags);
-    let removed = false;
-    [...filterState.tags].forEach((tag) => {
-      if (!validTags.has(tag)) {
-        filterState.tags.delete(tag);
-        removed = true;
-      }
-    });
-    if (removed && filterElements.keyword && !isFilterActive()) {
-      filterElements.keyword.value = filterState.keyword;
-    }
-
-    filterElements.tagList.replaceChildren();
-
-    if (!allTags.length) {
-      const empty = document.createElement('p');
-      empty.className = 'text-xs text-slate-500';
-      empty.textContent = 'タグはまだ登録されていません。';
-      filterElements.tagList.appendChild(empty);
-      return;
-    }
-
-    allTags.forEach((tag) => {
-      const button = document.createElement('button');
-      button.type = 'button';
-      button.dataset.tagValue = tag;
-      button.textContent = `#${tag}`;
-      button.className = buildTagFilterClass(filterState.tags.has(tag));
-      filterElements.tagList.appendChild(button);
-    });
-  }
-
-  function buildTagFilterClass(isActive) {
-    const base = "rounded-full border px-3 py-1 text-xs font-medium transition focus:outline-none focus-visible:ring focus-visible:ring-kanban-accent focus-visible:ring-offset-2 focus-visible:ring-offset-slate-900";
-    return isActive
-      ? `${base} border-kanban-accent bg-kanban-accent/20 text-kanban-accent`
-      : `${base} border-slate-600/70 bg-slate-800/80 text-slate-300 hover:border-slate-400 hover:text-white`;
-  }
-
-  function buildTagPillClass(isActive) {
-    const base = "inline-flex items-center rounded-full border px-2 py-0.5 text-[11px] font-medium";
-    return isActive
-      ? `${base} border-kanban-accent bg-kanban-accent/20 text-kanban-accent`
-      : `${base} border-slate-600/70 bg-slate-800/80 text-slate-300`;
-  }
-
-  function cleanupSelection() {
-    const validIds = new Set(tasks.map((task) => task.id));
-    let changed = false;
-    selectionState.ids.forEach((id) => {
-      if (!validIds.has(id)) {
-        selectionState.ids.delete(id);
-        changed = true;
-      }
-    });
-    if (changed) {
-      updateSelectionUI();
-      syncSelectionCheckboxes();
-    }
-  }
-
-  function toggleSelection(taskId, isSelected) {
-    if (isSelected) {
-      selectionState.ids.add(taskId);
-    } else {
-      selectionState.ids.delete(taskId);
-    }
-    updateSelectionUI();
-    syncSelectionCheckboxes();
-  }
-
-  function selectAllVisible() {
-    if (!selectionState.lastVisibleIds.length) return;
-    selectionState.lastVisibleIds.forEach((id) => selectionState.ids.add(id));
-    updateSelectionUI();
-    syncSelectionCheckboxes();
-  }
-
-  function clearSelection() {
-    selectionState.ids.clear();
-    updateSelectionUI();
-    syncSelectionCheckboxes();
-  }
-
-  function syncSelectionCheckboxes() {
-    const checkboxes = document.querySelectorAll("[data-action=\"select-task\"]");
-    checkboxes.forEach((checkbox) => {
-      const card = checkbox.closest("[data-task-id]");
-      if (!card) return;
-      const isSelected = selectionState.ids.has(card.dataset.taskId);
-      checkbox.checked = isSelected;
-      card.classList.toggle("kanban-card-selected", isSelected);
-    });
-  }
-
-  function updateSelectionUI() {
-    const count = selectionState.ids.size;
-    if (selectionElements.counter) {
-      selectionElements.counter.textContent = `選択中: ${count}枚`;
-    }
-    if (selectionElements.delete) {
-      selectionElements.delete.disabled = count === 0;
-      selectionElements.delete.setAttribute("aria-disabled", count === 0 ? "true" : "false");
-    }
-    if (selectionElements.clear) {
-      selectionElements.clear.disabled = count === 0;
-    }
-    if (selectionElements.selectAll) {
-      selectionElements.selectAll.disabled = selectionState.lastVisibleIds.length === 0;
-    }
-  }
-
-  function deleteTask(taskId) {
-    const task = tasks.find((item) => item.id === taskId);
-    if (!task) return;
-    if (!window.confirm("このタスクを削除しますか？")) return;
-    selectionState.ids.delete(taskId);
-    tasks = tasks.filter((item) => item.id !== taskId);
-    persist();
-    render();
-    showMessage("タスクを削除しました。", "info");
-  }
-
-  function deleteSelectedTasks() {
-    const ids = [...selectionState.ids];
-    if (!ids.length) return;
-    if (!window.confirm(`選択中の${ids.length}件を削除しますか？`)) return;
-    const idSet = new Set(ids);
-    tasks = tasks.filter((task) => !idSet.has(task.id));
-    selectionState.ids.clear();
-    persist();
-    render();
-    showMessage("選択したタスクを削除しました。", "info");
-  }
-  function loadFromStorage() {
-    try {
-      const raw = window.localStorage.getItem(STORAGE_KEY);
-      if (!raw) return;
-      const parsed = JSON.parse(raw);
-      if (!Array.isArray(parsed)) return;
-
-      tasks = parsed
-        .filter((item) => typeof item === "object" && item !== null && item.id && item.title)
-        .map((item) => normalizeTask(item));
-    } catch (error) {
-      console.warn("Failed to load tasks from localStorage:", error);
-      tasks = [];
-    }
-  }
-
-  function normalizeTask(item) {
-    const status = columnSettings[item.status] ? item.status : "backlog";
-    const createdAt = item.createdAt ?? new Date().toISOString();
-    const normalized = {
-      id: item.id,
-      title: item.title,
-      owner: item.owner ?? "",
-      notes: item.notes ?? "",
-      status,
-      due: item.due ?? "",
-      createdAt,
-      tags: normalizeTags(item.tags),
-      link: normalizeLink(item.link ?? item.url ?? "")
-    };
-
-    if (status === "done") {
-      normalized.completedAt = item.completedAt ?? item.updatedAt ?? createdAt;
-    } else if (item.completedAt) {
-      normalized.completedAt = item.completedAt;
-    }
-
-    return normalized;
-  }
-
-  function normalizeTags(value) {
-    if (Array.isArray(value)) {
-      return parseTags(value.join(","));
-    }
-    if (typeof value === "string") {
-      return parseTags(value);
-    }
-    return [];
-  }
-
-  function persist() {
-    try {
-      window.localStorage.setItem(STORAGE_KEY, JSON.stringify(tasks));
-    } catch (error) {
-      console.warn("Failed to write tasks to localStorage:", error);
-      showMessage("ローカルストレージに保存できませんでした。", "warn");
-    }
-  }
-
-  function showMessage(message, tone = "info") {
-    if (!messageArea) return;
-    clearTimeout(messageTimer);
-    messageArea.textContent = message;
-    messageArea.classList.remove("opacity-0", "text-kanban-caution", "text-sky-300");
-    messageArea.classList.add(tone === "warn" ? "text-kanban-caution" : "text-sky-300", "opacity-100");
-    messageTimer = window.setTimeout(() => hideMessage(), 4200);
-  }
-
-  function hideMessage() {
-    if (!messageArea) return;
-    messageArea.classList.add("opacity-0");
-  }
-
-  function seedDemoData() {
-    const now = new Date();
-    const demoCards = [
-      {
-        title: "前日の不具合整理",
-        owner: "田中",
-        notes: "Eラインの停止要因を5Whyで再整理",
-        status: "backlog",
-        due: isoDateOffset(now, 1),
-        tags: ["品質", "改善"],
-        link: "https://example.com/quality-review"
-      },
-      {
-        title: "朝会ファシリテーション",
-        owner: "佐藤",
-        notes: "指標ボード更新と本日の重点テーマ共有",
-        status: "ready",
-        due: isoDateOffset(now, 0),
-        tags: ["コミュニケーション"],
-        link: "https://example.com/daily-meeting"
-      },
-      {
-        title: "標準作業票の更新",
-        owner: "鈴木",
-        notes: "工程C-12の新治具対応版。現場レビュー待ち。",
-        status: "waiting",
-        due: isoDateOffset(now, 3),
-        tags: ["標準化", "改善"],
-        link: "https://example.com/standard-work"
-      },
-      {
-        title: "トレーニング計画ドラフト",
-        owner: "山本",
-        notes: "新入社員向け。ヒアリング結果を反映中。",
-        status: "inProgress",
-        due: isoDateOffset(now, 5),
-        tags: ["人材育成"],
-        link: "https://example.com/training-plan"
-      },
-      {
-        title: "品質ロス分析",
-        owner: "石井",
-        notes: "先週分のデータを取り込み済み。残りは原因記入。",
-        status: "ready",
-        due: isoDateOffset(now, 2),
-        tags: ["品質", "分析"],
-        link: "https://example.com/quality-loss"
-      },
-      {
-        title: "安全KY実施",
-        owner: "加藤",
-        notes: "夜勤チームへ展開済み。記録は箱に保管。",
-        status: "done",
-        due: isoDateOffset(now, -1),
-        tags: ["安全", "教育"],
-        link: "https://example.com/safety-ky"
-      }
-    ];
-
-    demoCards.forEach((card, index) => {
-      const desiredStatus = card.status;
-      const status = canEnterColumn(desiredStatus) ? desiredStatus : "backlog";
-      const createdAt = new Date(now.getTime() + index * 1000);
-      const entry = {
-        id: createId(),
-        title: card.title,
-        owner: card.owner,
-        notes: card.notes,
-        status,
-        due: card.due,
-        createdAt: createdAt.toISOString(),
-        tags: parseTags(card.tags?.join(",") ?? ""),
-        link: normalizeLink(card.link ?? "")
-      };
-
-      if (status === "done") {
-        entry.completedAt = new Date(createdAt.getTime() + 60 * 60 * 1000).toISOString();
-      }
-
-      tasks.push(entry);
-    });
-
-    persist();
-    render();
-    showMessage("デモデータを追加しました。", "info");
-  }
-
-  function isoDateOffset(date, offsetDays) {
-    const clone = new Date(date);
-    clone.setDate(clone.getDate() + offsetDays);
-    return clone.toISOString().slice(0, 10);
-  }
-
-  function formatDue(value) {
-    if (!value) return "未設定";
-    try {
-      const date = new Date(value);
-      if (Number.isNaN(date.getTime())) return "未設定";
-      return `${date.getFullYear()}年${padZero(date.getMonth() + 1)}月${padZero(date.getDate())}日`;
-    } catch (_error) {
-      return "未設定";
-    }
-  }
-
-  function padZero(num) {
-    return String(num).padStart(2, "0");
-  }
-
-  function createId() {
-    if (typeof crypto !== "undefined" && typeof crypto.randomUUID === "function") {
-      return crypto.randomUUID();
-    }
-    return `task-${Date.now()}-${Math.random().toString(16).slice(2, 10)}`;
-  }
-
-  function openEditDialog(taskId) {
-    const task = tasks.find((item) => item.id === taskId);
-    if (!task) return;
-
-    if (!editDialog || !editForm || !editFields) {
-      fallbackEdit(task);
-      return;
-    }
-
-    editingTaskId = taskId;
-    editFields.title.value = task.title;
-    editFields.owner.value = task.owner ?? "";
-    editFields.due.value = task.due ?? "";
-    editFields.notes.value = task.notes ?? "";
-    if (editFields.tags) {
-      editFields.tags.value = Array.isArray(task.tags) ? task.tags.join(", ") : "";
-    }
-    editFields.link.value = task.link ?? "";
-
-    try {
-      if (typeof editDialog.showModal === "function") {
-        editDialog.showModal();
-      } else {
-        editDialog.setAttribute("open", "true");
-      }
-      window.setTimeout(() => editFields.title.focus(), 0);
-    } catch (error) {
-      console.warn("Failed to open dialog, using fallback.", error);
-      fallbackEdit(task);
-    }
-  }
-
-  function handleEditSubmit(event) {
-    event.preventDefault();
-    if (!editFields || !editingTaskId) return;
-
-    const title = editFields.title.value.trim();
-    if (!title) {
-      showMessage("タイトルを入力してください。", "warn");
-      editFields.title.focus();
-      return;
-    }
-
-    const updates = {
-      title,
-      owner: editFields.owner.value.trim(),
-      due: editFields.due.value,
-      notes: editFields.notes.value.trim(),
-      tags: parseTags(editFields.tags ? editFields.tags.value : ""),
-      link: normalizeLink(editFields.link?.value ?? "")
-    };
-
-    applyTaskUpdates(editingTaskId, updates);
-    closeEditDialog();
-  }
-
-  function applyTaskUpdates(taskId, updates) {
-    const task = tasks.find((item) => item.id === taskId);
-    if (!task) return false;
-
-    task.title = updates.title;
-    task.owner = updates.owner;
-    task.due = updates.due;
-    task.notes = updates.notes;
-    task.tags = updates.tags;
-    task.link = updates.link;
-
-    persist();
-    render();
-    showMessage("タスクを更新しました。", "info");
-    return true;
-  }
-
-  function closeEditDialog(fromEvent = false) {
-    if (!editDialog) return;
-
-    if (!fromEvent) {
-      if (typeof editDialog.close === "function" && editDialog.open) {
-        editDialog.close();
-      } else {
-        editDialog.removeAttribute("open");
-      }
-    } else {
-      editDialog.removeAttribute("open");
-    }
-
-    resetEditingState();
-  }
-
-  function resetEditingState() {
-    editingTaskId = null;
-    editForm?.reset();
-  }
-
-  function fallbackEdit(task) {
-    const title = window.prompt("タイトルを編集", task.title);
-    if (title === null) return;
-    const trimmedTitle = title.trim();
-    if (!trimmedTitle) {
-      showMessage("タイトルを入力してください。", "warn");
-      return;
-    }
-
-    const owner = window.prompt("担当を編集", task.owner ?? "") ?? task.owner ?? "";
-    const due = window.prompt("期限 (YYYY-MM-DD)", task.due ?? "") ?? task.due ?? "";
-    const notes = window.prompt("メモ", task.notes ?? "") ?? task.notes ?? "";
-    const tagsInput = window.prompt("タグ（カンマ区切り）", Array.isArray(task.tags) ? task.tags.join(", ") : "") ?? (Array.isArray(task.tags) ? task.tags.join(", ") : "");
-    const linkInput = window.prompt("参考リンク（URL）", task.link ?? "") ?? (task.link ?? "");
-
-    applyTaskUpdates(task.id, {
-      title: trimmedTitle,
-      owner: owner.trim(),
-      due,
-      notes: notes.trim(),
-      tags: parseTags(tagsInput),
-      link: normalizeLink(linkInput)
-    });
-  }
-
-  function toggleViewMode() {
-    uiState.compact = !uiState.compact;
-    updateViewToggleLabel();
-    render();
-    showMessage(uiState.compact ? "コンパクト表示に切り替えました。" : "標準表示に戻しました。", "info");
-  }
-
-  function updateViewToggleLabel() {
-    if (!uiElements.viewToggle) return;
-    uiElements.viewToggle.textContent = uiState.compact ? "標準表示" : "コンパクト表示";
-  }
-
-  function parseISODate(value) {
-    if (!value) return null;
-    try {
-      const date = new Date(value);
-      return Number.isNaN(date.getTime()) ? null : new Date(date.getFullYear(), date.getMonth(), date.getDate());
-    } catch (_error) {
-      return null;
-    }
-  }
-
-  function formatLinkLabel(url) {
-    try {
-      const parsed = new URL(url);
-      const path = parsed.pathname === "/" ? "" : parsed.pathname;
-      return `${parsed.hostname}${path}`;
-    } catch (_error) {
-      return url;
-    }
-  }
-
-function normalizeLink(input) {
-  if (!input) return "";
-  let raw0 = String(input).trim();
-  if (!raw0) return "";
-
-  // ✅ 追加: 先頭・末尾のダブルクォーテーションを削除
-  raw0 = raw0.replace(/^"(.*)"$/, "$1");
-
-  // 全角の「￥」をバックスラッシュに誤入力しているケースを補正
-  const raw = raw0.replace(/￥/g, "\\");
-
-  const ensureDirSlash = (u) => {
-    try {
-      const url = new URL(u);
-      if (url.protocol !== "file:") return u;
-      if (url.pathname.endsWith("/")) return u;
-
-      const last = decodeURI(url.pathname).split("/").pop() || "";
-      const looksLikeFile = /\.[A-Za-z0-9]{1,6}$/.test(last);
-      return looksLikeFile ? u : (u + "/");
-    } catch {
-      return u;
-    }
-  };
-
-  // 1) Windows ドライブパス: C:\... → file:///C:/...
-  if (/^[a-zA-Z]:\\/.test(raw)) {
-    const path = raw.replace(/\\/g, "/");
-    return ensureDirSlash(`file:///${encodeURI(path)}`);
-  }
-
-  // 2) UNC: \\server\share\path → file://server/share/path
-  if (/^\\\\[^\\]/.test(raw)) {
-    const path = raw.replace(/^\\\\/, "").replace(/\\/g, "/");
-    return ensureDirSlash(`file://${encodeURI(path)}`);
-  }
-
-  // 3) 明示スキームあり（http/https/file）
-  const hasScheme = /^[a-zA-Z][\\w+.-]*:/.test(raw);
-  if (hasScheme) {
-    try {
-      const url = new URL(raw);
-      if (/^https?:$/i.test(url.protocol)) return url.href;
-      if (/^file:$/i.test(url.protocol)) return ensureDirSlash(url.href);
-      return "";
-    } catch {
-      return "";
-    }
-  }
-
-  // 4) スキーム無し → Webドメインらしければ https:// を補完
-  try {
-    const candidate = `https://${raw}`;
-    const url = new URL(candidate);
-    return url.href;
-  } catch {
-    return "";
-  }
-}
-
-
-  function parseTags(input) {
-    if (!input) return [];
-    const parts = Array.isArray(input) ? input : String(input).split(/[,、\s]+/);
-    const seen = new Set();
-    const result = [];
-    parts
-      .map((item) => String(item).trim())
-      .filter(Boolean)
-      .forEach((tag) => {
-        const cleaned = tag.replace(/^#/, "").trim();
-        if (!cleaned) return;
-        const key = cleaned.toLowerCase();
-        if (seen.has(key)) return;
-        seen.add(key);
-        result.push(cleaned);
-      });
-    return result;
-  }
-})();
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+
+(() => {
+  "use strict";
+
+  const STORAGE_KEY = "toyota-kanban-tasks-v1";
+  const SETTINGS_KEY = "toyota-kanban-settings-v1";
+  const DEFAULT_TITLE = "トヨタ式カンバンボード";
+  const PANEL_KEYS = ["analytics", "filters", "form"];
+
+  const columnSettings = {
+    backlog: { wip: Number.POSITIVE_INFINITY, label: "バックログ" },
+    ready: { wip: 5, label: "準備中" },
+    inProgress: { wip: 3, label: "仕掛中" },
+    waiting: { wip: 2, label: "停止中" },
+    done: { wip: Number.POSITIVE_INFINITY, label: "完了" }
+  };
+
+  const form = document.getElementById("task-form");
+  const fields = {
+    title: document.getElementById("task-title"),
+    owner: document.getElementById("task-owner"),
+    due: document.getElementById("task-due"),
+    status: document.getElementById("task-status"),
+    notes: document.getElementById("task-notes"),
+    tags: document.getElementById("task-tags"),
+    link: document.getElementById("task-link")
+  };
+  const messageArea = document.getElementById("message-area");
+  const seedButton = document.getElementById("seed-demo");
+  const template = document.getElementById("task-template");
+  const dropzones = Array.from(document.querySelectorAll("[data-dropzone]"));
+  const counters = Array.from(document.querySelectorAll("[data-counter]"));
+  const metricElements = {
+    total: document.querySelector("[data-metric=\"total\"]"),
+    active: document.querySelector("[data-metric=\"active\"]"),
+    throughput7: document.querySelector("[data-metric=\"throughput7\"]"),
+    leadtime: document.querySelector("[data-metric=\"leadtime\"]")
+  };
+  const editDialog = document.getElementById("edit-dialog");
+  const editForm = document.getElementById("edit-form");
+  const editFields = editForm
+    ? {
+        title: document.getElementById("edit-title"),
+        owner: document.getElementById("edit-owner"),
+        due: document.getElementById("edit-due"),
+        notes: document.getElementById("edit-notes"),
+        tags: document.getElementById("edit-tags"),
+        link: document.getElementById("edit-link")
+      }
+    : null;
+
+  const boardTitleHeading = document.getElementById("board-title-heading");
+  const titleEditButton = document.getElementById("title-edit");
+  const panelSections = Array.from(document.querySelectorAll("[data-panel]"));
+  const panels = new Map(panelSections.map((section) => [section.dataset.panel, section]));
+  const panelToggleButtons = Array.from(document.querySelectorAll("[data-action=\"toggle-panel\"]"));
+
+  const filterElements = {
+    keyword: document.getElementById("filter-keyword"),
+    dueStart: document.getElementById("filter-due-start"),
+    dueEnd: document.getElementById("filter-due-end"),
+    clear: document.getElementById("filter-clear"),
+    tagList: document.getElementById("filter-tag-list")
+  };
+  const selectionElements = {
+    counter: document.getElementById("selection-counter"),
+    hint: document.getElementById("selection-hint"),
+    selectAll: document.getElementById("selection-selectall"),
+    clear: document.getElementById("selection-clear"),
+    delete: document.getElementById("selection-delete")
+  };
+  const dataTransferElements = {
+    exportButton: document.getElementById("data-export"),
+    importButton: document.getElementById("data-import"),
+    importInput: document.getElementById("data-import-input")
+  };
+
+  const uiElements = {
+    viewToggle: document.getElementById("view-toggle")
+  };
+
+  const filterState = {
+    keyword: "",
+    dueStart: "",
+    dueEnd: "",
+    tags: new Set()
+  };
+
+  const selectionState = {
+    ids: new Set(),
+    lastVisibleIds: []
+  };
+
+  const uiState = {
+    compact: false
+  };
+
+  let settings = createDefaultSettings();
+  let tasks = [];
+  let messageTimer = null;
+  let draggingTaskId = null;
+  let editingTaskId = null;
+
+  init();
+
+  function createDefaultSettings() {
+    return {
+      title: DEFAULT_TITLE,
+      panels: PANEL_KEYS.reduce((acc, key) => {
+        acc[key] = false;
+        return acc;
+      }, {})
+    };
+  }
+
+  function init() {
+    loadSettings();
+    applyTitle();
+    applyPanelStates({ initial: true });
+    loadFromStorage();
+    attachFormEvents();
+    attachDropzoneEvents();
+    attachSeedButton();
+    attachEditForm();
+    attachFilterHandlers();
+    attachSelectionHandlers();
+    attachDataTransferHandlers();
+    attachViewHandlers();
+    attachPanelHandlers();
+    attachTitleEditor();
+    form?.addEventListener("reset", () => hideMessage());
+    updateViewToggleLabel();
+    updateSelectionUI();
+    render();
+  }
+
+  function loadSettings() {
+    try {
+      const raw = window.localStorage.getItem(SETTINGS_KEY);
+      if (raw) {
+        const parsed = JSON.parse(raw);
+        if (parsed && typeof parsed === "object") {
+          settings = {
+            title: typeof parsed.title === "string" && parsed.title.trim() ? parsed.title.trim() : DEFAULT_TITLE,
+            panels: { ...createDefaultSettings().panels, ...(parsed.panels || {}) }
+          };
+          return;
+        }
+      }
+    } catch (error) {
+      console.warn("Failed to load settings:", error);
+    }
+    settings = createDefaultSettings();
+  }
+
+  function saveSettings() {
+    try {
+      window.localStorage.setItem(SETTINGS_KEY, JSON.stringify(settings));
+    } catch (error) {
+      console.warn("Failed to save settings:", error);
+    }
+  }
+
+  function applyTitle() {
+    if (boardTitleHeading) {
+      boardTitleHeading.textContent = settings.title;
+    }
+    document.title = settings.title;
+  }
+
+  function attachTitleEditor() {
+    titleEditButton?.addEventListener("click", handleTitleEdit);
+  }
+
+  function handleTitleEdit() {
+    const current = settings.title || DEFAULT_TITLE;
+    const next = window.prompt("ボードタイトルを入力してください。", current);
+    if (next === null) return;
+    const trimmed = next.trim();
+    settings.title = trimmed || DEFAULT_TITLE;
+    applyTitle();
+    saveSettings();
+    showMessage("タイトルを更新しました。", "info");
+  }
+
+  function attachPanelHandlers() {
+    panelToggleButtons.forEach((button) => {
+      button.addEventListener("click", () => {
+        const key = button.dataset.target;
+        const section = panels.get(key);
+        if (!key || !section) return;
+        const willCollapse = !section.classList.contains("panel-collapsed");
+        setPanelCollapsed(key, willCollapse);
+      });
+    });
+  }
+
+  function applyPanelStates({ initial = false } = {}) {
+    PANEL_KEYS.forEach((key) => {
+      const collapsed = Boolean(settings.panels[key]);
+      setPanelCollapsed(key, collapsed, { save: !initial });
+    });
+  }
+  function setPanelCollapsed(panelKey, collapsed, { save = true } = {}) {
+    const section = panels.get(panelKey);
+    if (!section) return;
+    section.classList.toggle("panel-collapsed", collapsed);
+    const body = section.querySelector(`[data-panel-body="${panelKey}"]`);
+    if (body) {
+      body.hidden = collapsed;
+    }
+    updatePanelButton(panelKey, collapsed);
+    settings.panels[panelKey] = collapsed;
+    if (save) {
+      saveSettings();
+    }
+  }
+
+  function updatePanelButton(panelKey, collapsed) {
+    const button = panelToggleButtons.find((item) => item.dataset.target === panelKey);
+    if (!button) return;
+    button.textContent = collapsed ? "展開する" : "折りたたむ";
+    button.setAttribute("aria-expanded", collapsed ? "false" : "true");
+  }
+
+  function attachFormEvents() {
+    form?.addEventListener("submit", handleSubmit);
+  }
+
+  function handleSubmit(event) {
+    event.preventDefault();
+    const rawTitle = fields.title.value.trim();
+    const rawOwner = fields.owner.value.trim();
+    const rawNotes = fields.notes.value.trim();
+    const status = fields.status.value;
+    const due = fields.due.value;
+    const tags = parseTags(fields.tags?.value ?? "");
+    const link = normalizeLink(fields.link?.value ?? "");
+
+    if (!rawTitle) {
+      showMessage("タイトルを入力してください。", "warn");
+      fields.title.focus();
+      return;
+    }
+
+    if (!canEnterColumn(status)) {
+      const limit = columnSettings[status]?.wip;
+      const label = columnSettings[status]?.label ?? status;
+      showMessage(`「${label}」はWIP上限（${limit}）を超えられません。`, "warn");
+      return;
+    }
+
+    const now = new Date();
+    const newTask = {
+      id: createId(),
+      title: rawTitle,
+      owner: rawOwner,
+      due,
+      notes: rawNotes,
+      status,
+      link,
+      createdAt: now.toISOString(),
+      tags
+    };
+
+    if (status === "done") {
+      newTask.completedAt = now.toISOString();
+    }
+
+    tasks.push(newTask);
+    persist();
+    render();
+    form.reset();
+    fields.title.focus();
+    showMessage("タスクを登録しました。", "info");
+  }
+
+  function attachDropzoneEvents() {
+    dropzones.forEach((zone) => {
+      zone.addEventListener("dragover", handleDragOver);
+      zone.addEventListener("dragleave", handleDragLeave);
+      zone.addEventListener("drop", handleDrop);
+    });
+  }
+
+  function attachSeedButton() {
+    seedButton?.addEventListener("click", seedDemoData);
+  }
+
+  function attachEditForm() {
+    if (!editForm || !editDialog || !editFields) return;
+
+    editForm.addEventListener("submit", handleEditSubmit);
+    const cancelButton = editForm.querySelector("[data-action=\"cancel-edit\"]");
+    cancelButton?.addEventListener("click", () => closeEditDialog());
+
+    editDialog.addEventListener("cancel", () => closeEditDialog(true));
+    editDialog.addEventListener("close", () => resetEditingState());
+  }
+
+  function attachFilterHandlers() {
+    filterElements.keyword?.addEventListener("input", handleKeywordFilter);
+    filterElements.dueStart?.addEventListener("change", handleDueFilter);
+    filterElements.dueEnd?.addEventListener("change", handleDueFilter);
+    filterElements.clear?.addEventListener("click", clearFilters);
+    filterElements.tagList?.addEventListener("click", handleTagFilterClick);
+  }
+
+  function attachSelectionHandlers() {
+    selectionElements.selectAll?.addEventListener("click", selectAllVisible);
+    selectionElements.clear?.addEventListener("click", () => {
+      clearSelection();
+      syncSelectionCheckboxes();
+    });
+    selectionElements.delete?.addEventListener("click", deleteSelectedTasks);
+  }
+
+  function attachDataTransferHandlers() {
+    const { exportButton, importButton, importInput } = dataTransferElements;
+    exportButton?.addEventListener("click", handleExportTasks);
+    importButton?.addEventListener("click", () => importInput?.click());
+    importInput?.addEventListener("change", handleImportFileSelection);
+  }
+
+  function handleExportTasks() {
+    if (!tasks.length) {
+      showMessage("エクスポートできるカードがありません。", "warn");
+      return;
+    }
+
+    try {
+      const now = new Date();
+      const payload = {
+        version: 1,
+        exportedAt: now.toISOString(),
+        boardTitle: settings.title,
+        tasks: tasks.map((task) => ({ ...task }))
+      };
+      const blob = new Blob([JSON.stringify(payload, null, 2)], { type: "application/json" });
+      const filename = `kanban-export-${now.toISOString().replace(/[:.]/g, "-")}.json`;
+      const url = URL.createObjectURL(blob);
+      const link = document.createElement("a");
+      link.href = url;
+      link.download = filename;
+      document.body.appendChild(link);
+      link.click();
+      window.setTimeout(() => {
+        document.body.removeChild(link);
+        URL.revokeObjectURL(url);
+      }, 0);
+      showMessage("カードデータをエクスポートしました。", "info");
+    } catch (error) {
+      console.warn("Failed to export tasks:", error);
+      showMessage("エクスポートに失敗しました。", "warn");
+    }
+  }
+
+  function handleImportFileSelection(event) {
+    const input = event.target;
+    if (!input?.files?.length) return;
+
+    const [file] = input.files;
+    const reader = new FileReader();
+
+    reader.addEventListener("load", () => {
+      try {
+        const imported = parseImportedTasks(reader.result);
+        if (!imported.length) {
+          showMessage("取り込めるカードが見つかりませんでした。", "warn");
+        } else {
+          tasks = imported;
+          selectionState.ids.clear();
+          persist();
+          render();
+          showMessage(`${imported.length}件のカードをインポートしました。`, "info");
+        }
+      } catch (error) {
+        console.warn("Failed to import tasks:", error);
+        showMessage("インポートに失敗しました。", "warn");
+      } finally {
+        input.value = "";
+      }
+    });
+
+    reader.addEventListener("error", () => {
+      console.warn("Failed to read import file:", reader.error);
+      showMessage("ファイルを読み取れませんでした。", "warn");
+      input.value = "";
+    });
+
+    reader.readAsText(file, "utf-8");
+  }
+
+  function parseImportedTasks(raw) {
+    if (raw == null) return [];
+
+    let data;
+    try {
+      data = JSON.parse(String(raw));
+    } catch (error) {
+      throw new Error("Invalid JSON");
+    }
+
+    const entries = Array.isArray(data) ? data : Array.isArray(data?.tasks) ? data.tasks : [];
+    if (!entries.length) {
+      return [];
+    }
+
+    const seenIds = new Set();
+    const imported = [];
+
+    entries.forEach((item) => {
+      if (!item || typeof item !== "object") return;
+      const candidate = { ...item };
+      let id = normalizeImportedId(candidate.id);
+      if (!id) {
+        id = createId();
+      }
+      while (seenIds.has(id)) {
+        id = createId();
+      }
+      candidate.id = id;
+      const normalized = normalizeTask(candidate);
+      if (!normalized.title) return;
+      seenIds.add(normalized.id);
+      imported.push(normalized);
+    });
+
+    return imported;
+  }
+
+  function normalizeImportedId(value) {
+    if (typeof value === "string") {
+      const trimmed = value.trim();
+      return trimmed ? trimmed : "";
+    }
+    if (typeof value === "number" && Number.isFinite(value)) {
+      return String(value);
+    }
+    return "";
+  }
+
+  function attachViewHandlers() {
+    uiElements.viewToggle?.addEventListener("click", toggleViewMode);
+  }
+
+  function handleKeywordFilter(event) {
+    filterState.keyword = event.target.value.trim();
+    render();
+  }
+
+  function handleDueFilter() {
+    filterState.dueStart = filterElements.dueStart?.value ?? "";
+    filterState.dueEnd = filterElements.dueEnd?.value ?? "";
+    render();
+  }
+
+  function handleTagFilterClick(event) {
+    const button = event.target.closest("[data-tag-value]");
+    if (!button) return;
+    const tag = button.dataset.tagValue;
+    if (!tag) return;
+
+    if (filterState.tags.has(tag)) {
+      filterState.tags.delete(tag);
+    } else {
+      filterState.tags.add(tag);
+    }
+    render();
+  }
+
+  function clearFilters() {
+    filterState.keyword = "";
+    filterState.dueStart = "";
+    filterState.dueEnd = "";
+    filterState.tags.clear();
+    if (filterElements.keyword) {
+      filterElements.keyword.value = "";
+    }
+    if (filterElements.dueStart) {
+      filterElements.dueStart.value = "";
+    }
+    if (filterElements.dueEnd) {
+      filterElements.dueEnd.value = "";
+    }
+    render();
+  }
+
+  function handleDragStart(event) {
+    const card = event.currentTarget;
+    const taskId = card.dataset.taskId;
+    if (!taskId) return;
+    draggingTaskId = taskId;
+    event.dataTransfer.effectAllowed = "move";
+    event.dataTransfer.setData("text/plain", taskId);
+    card.classList.add("opacity-40");
+  }
+
+  function handleDragEnd(event) {
+    event.currentTarget.classList.remove("opacity-40");
+    draggingTaskId = null;
+    dropzones.forEach((zone) => setDropzoneHighlight(zone, "none"));
+  }
+
+  function handleDragOver(event) {
+    event.preventDefault();
+    const zone = event.currentTarget;
+    const targetColumn = zone.dataset.dropzone;
+    const allowed = canEnterColumn(targetColumn, draggingTaskId);
+    event.dataTransfer.dropEffect = allowed ? "move" : "none";
+    setDropzoneHighlight(zone, allowed ? "allowed" : "denied");
+  }
+
+  function handleDragLeave(event) {
+    setDropzoneHighlight(event.currentTarget, "none");
+  }
+
+  function handleDrop(event) {
+    event.preventDefault();
+    const zone = event.currentTarget;
+    const targetColumn = zone.dataset.dropzone;
+    const taskId = draggingTaskId || event.dataTransfer.getData("text/plain");
+
+    setDropzoneHighlight(zone, "none");
+
+    if (!taskId) return;
+
+    if (!canEnterColumn(targetColumn, taskId)) {
+      const limit = columnSettings[targetColumn]?.wip;
+      const label = columnSettings[targetColumn]?.label ?? targetColumn;
+      showMessage(`「${label}」はWIP上限（${limit}）を超えられません。`, "warn");
+      return;
+    }
+
+    moveTask(taskId, targetColumn);
+  }
+
+  function moveTask(taskId, targetColumn) {
+    const task = tasks.find((item) => item.id === taskId);
+    if (!task || task.status === targetColumn) return;
+
+    task.status = targetColumn;
+    if (targetColumn === "done") {
+      task.completedAt = new Date().toISOString();
+    }
+
+    persist();
+    render();
+    showMessage(`タスクを「${columnSettings[targetColumn]?.label ?? targetColumn}」へ移動しました。`, "info");
+  }
+
+  function render() {
+    cleanupSelection();
+    renderTagFilters();
+
+    const filterActive = isFilterActive();
+    const filteredTasks = getFilteredTasks();
+    const tasksToRender = filterActive ? filteredTasks : tasks;
+
+    selectionState.lastVisibleIds = tasksToRender.map((task) => task.id);
+
+    dropzones.forEach((zone) => zone.replaceChildren());
+
+    const byColumn = new Map();
+    tasksToRender
+      .slice()
+      .sort((a, b) => new Date(a.createdAt || 0).getTime() - new Date(b.createdAt || 0).getTime())
+      .forEach((task) => {
+        const list = byColumn.get(task.status) ?? [];
+        list.push(task);
+        byColumn.set(task.status, list);
+      });
+
+    dropzones.forEach((zone) => {
+      const columnKey = zone.dataset.dropzone;
+      const columnTasks = byColumn.get(columnKey) ?? [];
+      columnTasks.forEach((task) => zone.appendChild(buildTaskCard(task)));
+      if (!zone.childElementCount) {
+        zone.appendChild(createEmptyState(filterActive));
+      }
+    });
+
+    updateCounters(filterActive, filteredTasks);
+    renderMetrics(filteredTasks, filterActive);
+    syncSelectionCheckboxes();
+    updateSelectionUI();
+  }
+  function buildTaskCard(task) {
+    const fragment = template.content.cloneNode(true);
+    const card = fragment.querySelector("[data-task-id]");
+    card.dataset.taskId = task.id;
+
+    const isSelected = selectionState.ids.has(task.id);
+    card.classList.toggle("kanban-card-selected", isSelected);
+
+
+
+    const titleEl = card.querySelector("[data-field=\"title\"]");
+    const ownerEl = card.querySelector("[data-field=\"owner\"]");
+    const dueEl = card.querySelector("[data-field=\"due\"]");
+    const notesEl = card.querySelector("[data-field=\"notes\"]");
+    const tagsEl = card.querySelector("[data-field=\"tags\"]");
+    const tagsSection = card.querySelector("[data-section=\"tags\"]");
+    const linkSection = card.querySelector("[data-section=\"link\"]");
+    const linkEl = card.querySelector("[data-field=\"link\"]");
+    const doneButton = card.querySelector("[data-action=\"mark-done\"]");
+    const editButton = card.querySelector("[data-action=\"edit-task\"]");
+    const deleteButton = card.querySelector("[data-action=\"delete-task\"]");
+    const checkbox = card.querySelector("[data-action=\"select-task\"]");
+    const toggleDetailsButton = card.querySelector("[data-action=\"toggle-details\"]");
+
+    titleEl.textContent = task.title;
+    ownerEl.textContent = task.owner || "未設定";
+    dueEl.textContent = formatDue(task.due);
+    notesEl.textContent = task.notes || "メモなし";
+    notesEl.classList.toggle("text-slate-500", !task.notes);
+
+    if (tagsEl) {
+      tagsEl.replaceChildren();
+      const hasTags = Array.isArray(task.tags) && task.tags.length > 0;
+      tagsSection?.classList.toggle("hidden", !hasTags);
+      tagsSection?.setAttribute("aria-hidden", hasTags ? "false" : "true");
+      tagsSection?.setAttribute("data-has-tags", hasTags ? "true" : "false");
+      if (hasTags) {
+        task.tags.forEach((tag) => {
+          const pill = document.createElement("span");
+          pill.textContent = `#${tag}`;
+          pill.className = buildTagPillClass(filterState.tags.has(tag));
+          tagsEl.appendChild(pill);
+        });
+      }
+    }
+
+    if (linkSection && linkEl) {
+      if (task.link) {
+        linkSection.classList.remove("hidden");
+        linkEl.href = task.link;
+        linkEl.textContent = formatLinkLabel(task.link);
+        linkEl.title = task.link;
+      } else {
+        linkSection.classList.add("hidden");
+        linkEl.removeAttribute("href");
+        linkEl.removeAttribute("title");
+        linkEl.textContent = "";
+      }
+    }
+
+    if (checkbox) {
+      checkbox.checked = isSelected;
+      checkbox.addEventListener("click", (event) => event.stopPropagation());
+      checkbox.addEventListener("mousedown", (event) => event.stopPropagation());
+      checkbox.addEventListener("change", (event) => toggleSelection(task.id, event.target.checked));
+    }
+
+    if (doneButton) {
+      const isDone = task.status === "done";
+      doneButton.classList.toggle("hidden", isDone);
+      doneButton.addEventListener("click", (event) => {
+        event.preventDefault();
+        event.stopPropagation();
+        moveTask(task.id, "done");
+      });
+    }
+
+    editButton?.addEventListener("click", (event) => {
+      event.preventDefault();
+      event.stopPropagation();
+      openEditDialog(task.id);
+    });
+    deleteButton?.addEventListener("click", (event) => {
+      event.preventDefault();
+      event.stopPropagation();
+      deleteTask(task.id);
+    });
+
+    if (toggleDetailsButton) {
+      toggleDetailsButton.addEventListener("click", (event) => {
+        event.preventDefault();
+        event.stopPropagation();
+        card.classList.toggle("kanban-card-expanded");
+        updateCardDetailVisibility(card);
+      });
+    }
+
+    card.addEventListener("dragstart", handleDragStart);
+    card.addEventListener("dragend", handleDragEnd);
+
+    applyCardLayout(card);
+
+    return card;
+  }
+
+  function applyCardLayout(card) {
+    if (!card) return;
+    card.classList.toggle("kanban-card-compact", uiState.compact);
+    if (!uiState.compact) {
+      card.classList.remove("kanban-card-expanded");
+    }
+    updateCardDetailVisibility(card);
+  }
+
+  function updateCardDetailVisibility(card) {
+    const isExpanded = card.classList.contains("kanban-card-expanded");
+    const showDetails = !uiState.compact || isExpanded;
+
+    const meta = card.querySelector("[data-section=\"meta\"]");
+    const notes = card.querySelector("[data-section=\"notes\"]");
+    const tags = card.querySelector("[data-section=\"tags\"]");
+    const toggleDetailsButton = card.querySelector("[data-action=\"toggle-details\"]");
+
+    if (meta) {
+      meta.classList.toggle("hidden", !showDetails);
+    }
+    if (notes) {
+      notes.classList.toggle("hidden", !showDetails);
+      notes.classList.toggle("kanban-note-clamped", uiState.compact && !isExpanded);
+    }
+
+    if (tags) {
+      const hasTags = tags && tags.getAttribute("data-has-tags") === "true";
+      if (hasTags) {
+        tags.classList.toggle("hidden", !showDetails);
+      }
+    }
+    if (toggleDetailsButton) {
+      const hasDetails = Boolean((meta && meta.textContent.trim()) || (notes && notes.textContent.trim() && notes.textContent.trim() !== "メモなし"));
+      const shouldShowToggle = uiState.compact && hasDetails;
+      toggleDetailsButton.classList.toggle("invisible", !shouldShowToggle);
+      toggleDetailsButton.classList.toggle("pointer-events-none", !shouldShowToggle);
+      toggleDetailsButton.textContent = isExpanded ? "折りたたむ" : "詳細";
+      toggleDetailsButton.setAttribute("aria-expanded", isExpanded ? "true" : "false");
+    }
+  }
+
+  function createEmptyState(filterActive) {
+    const empty = document.createElement("p");
+    empty.className = "rounded-lg border border-dashed border-slate-600/60 px-3 py-6 text-center text-xs text-slate-500";
+    empty.textContent = filterActive ? "該当するカードがありません" : "カードなし";
+    empty.setAttribute("aria-hidden", "true");
+    return empty;
+  }
+
+  function updateCounters(filterActive, filteredTasks) {
+    counters.forEach((counter) => {
+      const columnKey = counter.dataset.counter;
+      const totalCount = tasks.filter((task) => task.status === columnKey).length;
+      const visibleCount = filterActive
+        ? filteredTasks.filter((task) => task.status === columnKey).length
+        : totalCount;
+
+      counter.textContent = filterActive ? `${visibleCount}/${totalCount}` : String(totalCount);
+
+      const parentArticle = counter.closest("article");
+      if (!parentArticle) return;
+
+      const limit = columnSettings[columnKey]?.wip;
+      const isLimited = Number.isFinite(limit);
+      parentArticle.classList.remove("border", "border-kanban-caution");
+      if (isLimited && totalCount >= limit) {
+        parentArticle.classList.add("border", "border-kanban-caution");
+      }
+    });
+  }
+
+  function renderMetrics(filteredTasks, filterActive) {
+    const activeStatuses = new Set(["ready", "inProgress", "waiting"]);
+
+    const visibleTasks = filterActive ? filteredTasks : tasks;
+    const totalTasks = tasks.length;
+    const visibleTotal = visibleTasks.length;
+
+    const totalDisplay = filterActive
+      ? formatFilteredCount(visibleTotal, totalTasks)
+      : formatCount(totalTasks);
+
+    const totalActive = tasks.filter((task) => activeStatuses.has(task.status)).length;
+    const visibleActive = visibleTasks.filter((task) => activeStatuses.has(task.status)).length;
+    const activeDisplay = filterActive
+      ? formatFilteredCount(visibleActive, totalActive)
+      : formatCount(totalActive);
+
+    const now = new Date();
+    const sevenDaysAgo = new Date(now);
+    sevenDaysAgo.setDate(now.getDate() - 7);
+
+    const totalDone = tasks.filter((task) => task.status === "done");
+    const visibleDone = visibleTasks.filter((task) => task.status === "done");
+
+    const totalThroughput7 = totalDone.filter((task) => isCompletedSince(task, sevenDaysAgo)).length;
+    const visibleThroughput7 = visibleDone.filter((task) => isCompletedSince(task, sevenDaysAgo)).length;
+    const throughputDisplay = filterActive
+      ? formatFilteredCount(visibleThroughput7, totalThroughput7)
+      : formatCount(totalThroughput7);
+
+    const totalLeadAvg = computeAverageLead(totalDone);
+    const visibleLeadAvg = computeAverageLead(visibleDone);
+    const leadDisplay = filterActive
+      ? formatLeadFiltered(visibleLeadAvg, totalLeadAvg)
+      : formatLeadFiltered(totalLeadAvg, null);
+
+    setMetric("total", totalDisplay);
+    setMetric("active", activeDisplay);
+    setMetric("throughput7", throughputDisplay);
+    setMetric("leadtime", leadDisplay);
+  }
+
+  function computeAverageLead(doneTasks) {
+    const leadTimes = doneTasks
+      .map((task) => computeLeadTimeDays(task))
+      .filter((value) => Number.isFinite(value));
+    if (!leadTimes.length) return null;
+    const total = leadTimes.reduce((sum, value) => sum + value, 0);
+    return total / leadTimes.length;
+  }
+
+  function formatLeadFiltered(primary, overall) {
+    const base = Number.isFinite(primary) ? `${primary.toFixed(1)}日` : "--";
+    if (overall === null || overall === undefined) {
+      return base;
+    }
+    const overallText = Number.isFinite(overall) ? `${overall.toFixed(1)}日` : "--";
+    return `${base} / 全${overallText}`;
+  }
+
+  function setMetric(key, text) {
+    const target = metricElements[key];
+    if (!target) return;
+    target.textContent = text;
+  }
+
+  function formatCount(count) {
+    return `${count}枚`;
+  }
+
+  function formatFilteredCount(visible, total) {
+    return `${formatCount(visible)} / 全${formatCount(total)}`;
+  }
+
+  function isCompletedSince(task, threshold) {
+    if (!task.completedAt) return false;
+    const completed = new Date(task.completedAt);
+    return !Number.isNaN(completed.getTime()) && completed >= threshold;
+  }
+
+  function computeLeadTimeDays(task) {
+    if (!task?.createdAt || !task?.completedAt) return Number.NaN;
+    const start = new Date(task.createdAt);
+    const end = new Date(task.completedAt);
+    if (Number.isNaN(start.getTime()) || Number.isNaN(end.getTime())) return Number.NaN;
+    const diffMs = end.getTime() - start.getTime();
+    if (diffMs < 0) return Number.NaN;
+    return diffMs / (1000 * 60 * 60 * 24);
+  }
+
+  function setDropzoneHighlight(zone, state) {
+    zone.classList.remove("ring-2", "ring-offset-2", "ring-offset-slate-900", "ring-kanban-accent", "ring-kanban-caution", "bg-slate-800/40", "bg-slate-900/40");
+    if (state === "allowed") {
+      zone.classList.add("ring-2", "ring-offset-2", "ring-offset-slate-900", "ring-kanban-accent", "bg-slate-800/40");
+    } else if (state === "denied") {
+      zone.classList.add("ring-2", "ring-offset-2", "ring-offset-slate-900", "ring-kanban-caution", "bg-slate-900/40");
+    }
+  }
+
+  function canEnterColumn(columnKey, movingTaskId) {
+    const settingsColumn = columnSettings[columnKey];
+    if (!settingsColumn) return true;
+    if (!Number.isFinite(settingsColumn.wip)) return true;
+    const current = tasks.filter((task) => task.status === columnKey && task.id !== movingTaskId).length;
+    return current < settingsColumn.wip;
+  }
+
+  function isFilterActive() {
+    return (
+      Boolean(filterState.keyword) ||
+      Boolean(filterState.dueStart) ||
+      Boolean(filterState.dueEnd) ||
+      filterState.tags.size > 0
+    );
+  }
+
+  function getFilteredTasks() {
+    if (!isFilterActive()) return tasks;
+    const keyword = filterState.keyword.toLowerCase();
+    const startDate = parseISODate(filterState.dueStart);
+    const endDate = parseISODate(filterState.dueEnd);
+
+    return tasks.filter((task) => {
+      const keywordMatch = keyword
+        ? [task.title, task.owner, task.notes, task.due]
+            .filter(Boolean)
+            .some((value) => String(value).toLowerCase().includes(keyword))
+        : true;
+
+      const tagsMatch = filterState.tags.size
+        ? [...filterState.tags].every((tag) => Array.isArray(task.tags) && task.tags.includes(tag))
+        : true;
+
+      const dueMatch = (() => {
+        if (!startDate && !endDate) return true;
+        if (!task.due) return false;
+        const dueDate = parseISODate(task.due);
+        if (!dueDate) return false;
+        if (startDate && dueDate < startDate) return false;
+        if (endDate && dueDate > endDate) return false;
+        return true;
+      })();
+
+      return keywordMatch && tagsMatch && dueMatch;
+    });
+  }
+
+  function renderTagFilters() {
+    if (!filterElements.tagList) return;
+
+    const keyword = filterState.keyword.trim().toLowerCase();
+    const startDate = parseISODate(filterState.dueStart);
+    const endDate = parseISODate(filterState.dueEnd);
+
+    const sourceTasks = tasks.filter((task) => {
+      const keywordMatch = keyword
+        ? [task.title, task.owner, task.notes, task.due]
+            .filter(Boolean)
+            .some((value) => String(value).toLowerCase().includes(keyword))
+        : true;
+
+      const dueMatch = (() => {
+        if (!startDate && !endDate) return true;
+        if (!task.due) return false;
+        const dueDate = parseISODate(task.due);
+        if (!dueDate) return false;
+        if (startDate && dueDate < startDate) return false;
+        if (endDate && dueDate > endDate) return false;
+        return true;
+      })();
+
+      return keywordMatch && dueMatch;
+    });
+
+    const allTags = Array.from(
+      new Set(
+        sourceTasks
+          .flatMap((task) => (Array.isArray(task.tags) ? task.tags : []))
+          .map((tag) => tag.trim())
+          .filter(Boolean)
+      )
+    ).sort((a, b) => a.localeCompare(b, 'ja'));
+
+    const validTags = new Set(allTags);
+    let removed = false;
+    [...filterState.tags].forEach((tag) => {
+      if (!validTags.has(tag)) {
+        filterState.tags.delete(tag);
+        removed = true;
+      }
+    });
+    if (removed && filterElements.keyword && !isFilterActive()) {
+      filterElements.keyword.value = filterState.keyword;
+    }
+
+    filterElements.tagList.replaceChildren();
+
+    if (!allTags.length) {
+      const empty = document.createElement('p');
+      empty.className = 'text-xs text-slate-500';
+      empty.textContent = 'タグはまだ登録されていません。';
+      filterElements.tagList.appendChild(empty);
+      return;
+    }
+
+    allTags.forEach((tag) => {
+      const button = document.createElement('button');
+      button.type = 'button';
+      button.dataset.tagValue = tag;
+      button.textContent = `#${tag}`;
+      button.className = buildTagFilterClass(filterState.tags.has(tag));
+      filterElements.tagList.appendChild(button);
+    });
+  }
+
+  function buildTagFilterClass(isActive) {
+    const base = "rounded-full border px-3 py-1 text-xs font-medium transition focus:outline-none focus-visible:ring focus-visible:ring-kanban-accent focus-visible:ring-offset-2 focus-visible:ring-offset-slate-900";
+    return isActive
+      ? `${base} border-kanban-accent bg-kanban-accent/20 text-kanban-accent`
+      : `${base} border-slate-600/70 bg-slate-800/80 text-slate-300 hover:border-slate-400 hover:text-white`;
+  }
+
+  function buildTagPillClass(isActive) {
+    const base = "inline-flex items-center rounded-full border px-2 py-0.5 text-[11px] font-medium";
+    return isActive
+      ? `${base} border-kanban-accent bg-kanban-accent/20 text-kanban-accent`
+      : `${base} border-slate-600/70 bg-slate-800/80 text-slate-300`;
+  }
+
+  function cleanupSelection() {
+    const validIds = new Set(tasks.map((task) => task.id));
+    let changed = false;
+    selectionState.ids.forEach((id) => {
+      if (!validIds.has(id)) {
+        selectionState.ids.delete(id);
+        changed = true;
+      }
+    });
+    if (changed) {
+      updateSelectionUI();
+      syncSelectionCheckboxes();
+    }
+  }
+
+  function toggleSelection(taskId, isSelected) {
+    if (isSelected) {
+      selectionState.ids.add(taskId);
+    } else {
+      selectionState.ids.delete(taskId);
+    }
+    updateSelectionUI();
+    syncSelectionCheckboxes();
+  }
+
+  function selectAllVisible() {
+    if (!selectionState.lastVisibleIds.length) return;
+    selectionState.lastVisibleIds.forEach((id) => selectionState.ids.add(id));
+    updateSelectionUI();
+    syncSelectionCheckboxes();
+  }
+
+  function clearSelection() {
+    selectionState.ids.clear();
+    updateSelectionUI();
+    syncSelectionCheckboxes();
+  }
+
+  function syncSelectionCheckboxes() {
+    const checkboxes = document.querySelectorAll("[data-action=\"select-task\"]");
+    checkboxes.forEach((checkbox) => {
+      const card = checkbox.closest("[data-task-id]");
+      if (!card) return;
+      const isSelected = selectionState.ids.has(card.dataset.taskId);
+      checkbox.checked = isSelected;
+      card.classList.toggle("kanban-card-selected", isSelected);
+    });
+  }
+
+  function updateSelectionUI() {
+    const count = selectionState.ids.size;
+    if (selectionElements.counter) {
+      selectionElements.counter.textContent = `選択中: ${count}枚`;
+    }
+    if (selectionElements.delete) {
+      selectionElements.delete.disabled = count === 0;
+      selectionElements.delete.setAttribute("aria-disabled", count === 0 ? "true" : "false");
+    }
+    if (selectionElements.clear) {
+      selectionElements.clear.disabled = count === 0;
+    }
+    if (selectionElements.selectAll) {
+      selectionElements.selectAll.disabled = selectionState.lastVisibleIds.length === 0;
+    }
+  }
+
+  function deleteTask(taskId) {
+    const task = tasks.find((item) => item.id === taskId);
+    if (!task) return;
+    if (!window.confirm("このタスクを削除しますか？")) return;
+    selectionState.ids.delete(taskId);
+    tasks = tasks.filter((item) => item.id !== taskId);
+    persist();
+    render();
+    showMessage("タスクを削除しました。", "info");
+  }
+
+  function deleteSelectedTasks() {
+    const ids = [...selectionState.ids];
+    if (!ids.length) return;
+    if (!window.confirm(`選択中の${ids.length}件を削除しますか？`)) return;
+    const idSet = new Set(ids);
+    tasks = tasks.filter((task) => !idSet.has(task.id));
+    selectionState.ids.clear();
+    persist();
+    render();
+    showMessage("選択したタスクを削除しました。", "info");
+  }
+  function loadFromStorage() {
+    try {
+      const raw = window.localStorage.getItem(STORAGE_KEY);
+      if (!raw) return;
+      const parsed = JSON.parse(raw);
+      if (!Array.isArray(parsed)) return;
+
+      tasks = parsed
+        .filter((item) => typeof item === "object" && item !== null && item.id && item.title)
+        .map((item) => normalizeTask(item));
+    } catch (error) {
+      console.warn("Failed to load tasks from localStorage:", error);
+      tasks = [];
+    }
+  }
+
+  function normalizeTask(item) {
+    const status = columnSettings[item.status] ? item.status : "backlog";
+    const createdAt = item.createdAt ?? new Date().toISOString();
+    const normalized = {
+      id: item.id,
+      title: item.title,
+      owner: item.owner ?? "",
+      notes: item.notes ?? "",
+      status,
+      due: item.due ?? "",
+      createdAt,
+      tags: normalizeTags(item.tags),
+      link: normalizeLink(item.link ?? item.url ?? "")
+    };
+
+    if (status === "done") {
+      normalized.completedAt = item.completedAt ?? item.updatedAt ?? createdAt;
+    } else if (item.completedAt) {
+      normalized.completedAt = item.completedAt;
+    }
+
+    return normalized;
+  }
+
+  function normalizeTags(value) {
+    if (Array.isArray(value)) {
+      return parseTags(value.join(","));
+    }
+    if (typeof value === "string") {
+      return parseTags(value);
+    }
+    return [];
+  }
+
+  function persist() {
+    try {
+      window.localStorage.setItem(STORAGE_KEY, JSON.stringify(tasks));
+    } catch (error) {
+      console.warn("Failed to write tasks to localStorage:", error);
+      showMessage("ローカルストレージに保存できませんでした���", "warn");
+    }
+  }
+
+  function showMessage(message, tone = "info") {
+    if (!messageArea) return;
+    clearTimeout(messageTimer);
+    messageArea.textContent = message;
+    messageArea.classList.remove("opacity-0", "text-kanban-caution", "text-sky-300");
+    messageArea.classList.add(tone === "warn" ? "text-kanban-caution" : "text-sky-300", "opacity-100");
+    messageTimer = window.setTimeout(() => hideMessage(), 4200);
+  }
+
+  function hideMessage() {
+    if (!messageArea) return;
+    messageArea.classList.add("opacity-0");
+  }
+
+  function seedDemoData() {
+    const now = new Date();
+    const demoCards = [
+      {
+        title: "前日の不具合整理",
+        owner: "田中",
+        notes: "Eラインの停止要因を5Whyで再整理",
+        status: "backlog",
+        due: isoDateOffset(now, 1),
+        tags: ["品質", "改善"],
+        link: "https://example.com/quality-review"
+      },
+      {
+        title: "朝会ファシリテーション",
+        owner: "佐藤",
+        notes: "指標ボード更新と本日の重点テーマ共有",
+        status: "ready",
+        due: isoDateOffset(now, 0),
+        tags: ["コミュニケーション"],
+        link: "https://example.com/daily-meeting"
+      },
+      {
+        title: "標準作業票の更新",
+        owner: "鈴木",
+        notes: "工程C-12の新治具対応版。現場レビュー待ち。",
+        status: "waiting",
+        due: isoDateOffset(now, 3),
+        tags: ["標準化", "改善"],
+        link: "https://example.com/standard-work"
+      },
+      {
+        title: "トレーニング計画ドラフト",
+        owner: "山本",
+        notes: "新入社員向け。ヒアリング結果を反映中。",
+        status: "inProgress",
+        due: isoDateOffset(now, 5),
+        tags: ["人材育成"],
+        link: "https://example.com/training-plan"
+      },
+      {
+        title: "品質ロス分析",
+        owner: "石井",
+        notes: "先週分のデータを取り込み済み。残りは原因記入。",
+        status: "ready",
+        due: isoDateOffset(now, 2),
+        tags: ["品質", "分析"],
+        link: "https://example.com/quality-loss"
+      },
+      {
+        title: "安全KY実施",
+        owner: "加藤",
+        notes: "夜勤チームへ展開済み。記録は箱に保管。",
+        status: "done",
+        due: isoDateOffset(now, -1),
+        tags: ["安全", "教育"],
+        link: "https://example.com/safety-ky"
+      }
+    ];
+
+    demoCards.forEach((card, index) => {
+      const desiredStatus = card.status;
+      const status = canEnterColumn(desiredStatus) ? desiredStatus : "backlog";
+      const createdAt = new Date(now.getTime() + index * 1000);
+      const entry = {
+        id: createId(),
+        title: card.title,
+        owner: card.owner,
+        notes: card.notes,
+        status,
+        due: card.due,
+        createdAt: createdAt.toISOString(),
+        tags: parseTags(card.tags?.join(",") ?? ""),
+        link: normalizeLink(card.link ?? "")
+      };
+
+      if (status === "done") {
+        entry.completedAt = new Date(createdAt.getTime() + 60 * 60 * 1000).toISOString();
+      }
+
+      tasks.push(entry);
+    });
+
+    persist();
+    render();
+    showMessage("デモデータを追加しました。", "info");
+  }
+
+  function isoDateOffset(date, offsetDays) {
+    const clone = new Date(date);
+    clone.setDate(clone.getDate() + offsetDays);
+    return clone.toISOString().slice(0, 10);
+  }
+
+  function formatDue(value) {
+    if (!value) return "未設定";
+    try {
+      const date = new Date(value);
+      if (Number.isNaN(date.getTime())) return "未設定";
+      return `${date.getFullYear()}年${padZero(date.getMonth() + 1)}月${padZero(date.getDate())}日`;
+    } catch (_error) {
+      return "未設定";
+    }
+  }
+
+  function padZero(num) {
+    return String(num).padStart(2, "0");
+  }
+
+  function createId() {
+    if (typeof crypto !== "undefined" && typeof crypto.randomUUID === "function") {
+      return crypto.randomUUID();
+    }
+    return `task-${Date.now()}-${Math.random().toString(16).slice(2, 10)}`;
+  }
+
+  function openEditDialog(taskId) {
+    const task = tasks.find((item) => item.id === taskId);
+    if (!task) return;
+
+    if (!editDialog || !editForm || !editFields) {
+      fallbackEdit(task);
+      return;
+    }
+
+    editingTaskId = taskId;
+    editFields.title.value = task.title;
+    editFields.owner.value = task.owner ?? "";
+    editFields.due.value = task.due ?? "";
+    editFields.notes.value = task.notes ?? "";
+    if (editFields.tags) {
+      editFields.tags.value = Array.isArray(task.tags) ? task.tags.join(", ") : "";
+    }
+    editFields.link.value = task.link ?? "";
+
+    try {
+      if (typeof editDialog.showModal === "function") {
+        editDialog.showModal();
+      } else {
+        editDialog.setAttribute("open", "true");
+      }
+      window.setTimeout(() => editFields.title.focus(), 0);
+    } catch (error) {
+      console.warn("Failed to open dialog, using fallback.", error);
+      fallbackEdit(task);
+    }
+  }
+
+  function handleEditSubmit(event) {
+    event.preventDefault();
+    if (!editFields || !editingTaskId) return;
+
+    const title = editFields.title.value.trim();
+    if (!title) {
+      showMessage("タイトルを入力してください。", "warn");
+      editFields.title.focus();
+      return;
+    }
+
+    const updates = {
+      title,
+      owner: editFields.owner.value.trim(),
+      due: editFields.due.value,
+      notes: editFields.notes.value.trim(),
+      tags: parseTags(editFields.tags ? editFields.tags.value : ""),
+      link: normalizeLink(editFields.link?.value ?? "")
+    };
+
+    applyTaskUpdates(editingTaskId, updates);
+    closeEditDialog();
+  }
+
+  function applyTaskUpdates(taskId, updates) {
+    const task = tasks.find((item) => item.id === taskId);
+    if (!task) return false;
+
+    task.title = updates.title;
+    task.owner = updates.owner;
+    task.due = updates.due;
+    task.notes = updates.notes;
+    task.tags = updates.tags;
+    task.link = updates.link;
+
+    persist();
+    render();
+    showMessage("タスクを更新しました。", "info");
+    return true;
+  }
+
+  function closeEditDialog(fromEvent = false) {
+    if (!editDialog) return;
+
+    if (!fromEvent) {
+      if (typeof editDialog.close === "function" && editDialog.open) {
+        editDialog.close();
+      } else {
+        editDialog.removeAttribute("open");
+      }
+    } else {
+      editDialog.removeAttribute("open");
+    }
+
+    resetEditingState();
+  }
+
+  function resetEditingState() {
+    editingTaskId = null;
+    editForm?.reset();
+  }
+
+  function fallbackEdit(task) {
+    const title = window.prompt("タイトルを編集", task.title);
+    if (title === null) return;
+    const trimmedTitle = title.trim();
+    if (!trimmedTitle) {
+      showMessage("タイトルを入力してください。", "warn");
+      return;
+    }
+
+    const owner = window.prompt("担当を編集", task.owner ?? "") ?? task.owner ?? "";
+    const due = window.prompt("期限 (YYYY-MM-DD)", task.due ?? "") ?? task.due ?? "";
+    const notes = window.prompt("メモ", task.notes ?? "") ?? task.notes ?? "";
+    const tagsInput = window.prompt("タグ（カンマ区切り）", Array.isArray(task.tags) ? task.tags.join(", ") : "") ?? (Array.isArray(task.tags) ? task.tags.join(", ") : "");
+    const linkInput = window.prompt("参考リンク（URL）", task.link ?? "") ?? (task.link ?? "");
+
+    applyTaskUpdates(task.id, {
+      title: trimmedTitle,
+      owner: owner.trim(),
+      due,
+      notes: notes.trim(),
+      tags: parseTags(tagsInput),
+      link: normalizeLink(linkInput)
+    });
+  }
+
+  function toggleViewMode() {
+    uiState.compact = !uiState.compact;
+    updateViewToggleLabel();
+    render();
+    showMessage(uiState.compact ? "コンパクト表示に切り替えました。" : "標準表示に戻しました。", "info");
+  }
+
+  function updateViewToggleLabel() {
+    if (!uiElements.viewToggle) return;
+    uiElements.viewToggle.textContent = uiState.compact ? "標準表示" : "コンパクト表示";
+  }
+
+  function parseISODate(value) {
+    if (!value) return null;
+    try {
+      const date = new Date(value);
+      return Number.isNaN(date.getTime()) ? null : new Date(date.getFullYear(), date.getMonth(), date.getDate());
+    } catch (_error) {
+      return null;
+    }
+  }
+
+  function formatLinkLabel(url) {
+    try {
+      const parsed = new URL(url);
+      const path = parsed.pathname === "/" ? "" : parsed.pathname;
+      return `${parsed.hostname}${path}`;
+    } catch (_error) {
+      return url;
+    }
+  }
+
+function normalizeLink(input) {
+  if (!input) return "";
+  let raw0 = String(input).trim();
+  if (!raw0) return "";
+
+  // ✅ 追加: 先頭・末尾のダブルクォーテーションを削除
+  raw0 = raw0.replace(/^"(.*)"$/, "$1");
+
+  // 全角の「￥」をバックスラッシュに誤入力しているケースを補正
+  const raw = raw0.replace(/￥/g, "\\");
+
+  const ensureDirSlash = (u) => {
+    try {
+      const url = new URL(u);
+      if (url.protocol !== "file:") return u;
+      if (url.pathname.endsWith("/")) return u;
+
+      const last = decodeURI(url.pathname).split("/").pop() || "";
+      const looksLikeFile = /\.[A-Za-z0-9]{1,6}$/.test(last);
+      return looksLikeFile ? u : (u + "/");
+    } catch {
+      return u;
+    }
+  };
+
+  // 1) Windows ドライブパス: C:\... → file:///C:/...
+  if (/^[a-zA-Z]:\\/.test(raw)) {
+    const path = raw.replace(/\\/g, "/");
+    return ensureDirSlash(`file:///${encodeURI(path)}`);
+  }
+
+  // 2) UNC: \\server\share\path → file://server/share/path
+  if (/^\\\\[^\\]/.test(raw)) {
+    const path = raw.replace(/^\\\\/, "").replace(/\\/g, "/");
+    return ensureDirSlash(`file://${encodeURI(path)}`);
+  }
+
+  // 3) 明示スキームあり（http/https/file）
+  const hasScheme = /^[a-zA-Z][\\w+.-]*:/.test(raw);
+  if (hasScheme) {
+    try {
+      const url = new URL(raw);
+      if (/^https?:$/i.test(url.protocol)) return url.href;
+      if (/^file:$/i.test(url.protocol)) return ensureDirSlash(url.href);
+      return "";
+    } catch {
+      return "";
+    }
+  }
+
+  // 4) スキーム無し → Webドメインらしければ https:// を補完
+  try {
+    const candidate = `https://${raw}`;
+    const url = new URL(candidate);
+    return url.href;
+  } catch {
+    return "";
+  }
+}
+
+
+  function parseTags(input) {
+    if (!input) return [];
+    const parts = Array.isArray(input) ? input : String(input).split(/[,、\s]+/);
+    const seen = new Set();
+    const result = [];
+    parts
+      .map((item) => String(item).trim())
+      .filter(Boolean)
+      .forEach((tag) => {
+        const cleaned = tag.replace(/^#/, "").trim();
+        if (!cleaned) return;
+        const key = cleaned.toLowerCase();
+        if (seen.has(key)) return;
+        seen.add(key);
+        result.push(cleaned);
+      });
+    return result;
+  }
+})();
+
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v6_軽量KanbanBoard/index.html

@@ -352,6 +352,14 @@
           <button id="selection-delete" type="button" class="rounded-lg bg-rose-500/80 px-3 py-1 text-xs font-semibold text-rose-50 transition hover:bg-rose-500 disabled:cursor-not-allowed disabled:bg-rose-900/40" disabled>
             選択削除
           </button>
+
+          <button id="data-export" type="button" class="rounded-lg border border-slate-600 px-3 py-1 text-xs font-medium text-slate-200 transition hover:border-slate-400 hover:text-white">
+            エクスポート
+          </button>
+          <button id="data-import" type="button" class="rounded-lg border border-slate-600 px-3 py-1 text-xs font-medium text-slate-200 transition hover:border-slate-400 hover:text-white">
+            インポート
+          </button>
+          <input id="data-import-input" type="file" accept="application/json" class="hidden" />
         </div>
       </div>