diff --git a/src/zotero_kb/templates/index.html b/src/zotero_kb/templates/index.html
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+<!doctype html>
+<html lang="zh-CN">
+  <head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <title>Zotero KB</title>
+    <style>
+      :root {
+        color-scheme: light;
+        --bg: #f2eee5;
+        --panel: rgba(255, 250, 242, 0.9);
+        --ink: #1d221b;
+        --muted: #56604f;
+        --line: #d7cdbd;
+        --accent: #2c6e49;
+        --accent-strong: #1e4d33;
+        --surface: #fffdf8;
+        --danger: #8b3a2a;
+      }
+      * {
+        box-sizing: border-box;
+      }
+      body {
+        margin: 0;
+        font-family: "Iowan Old Style", "Palatino Linotype", serif;
+        background:
+          radial-gradient(circle at top left, rgba(44, 110, 73, 0.14), transparent 30%),
+          linear-gradient(180deg, #f7f2e8, var(--bg));
+        color: var(--ink);
+      }
+      .layout {
+        display: grid;
+        grid-template-columns: 20rem 1fr 26rem;
+        min-height: 100vh;
+      }
+      .panel {
+        padding: 1.25rem;
+        border-right: 1px solid var(--line);
+        background: var(--panel);
+        backdrop-filter: blur(10px);
+        overflow: auto;
+      }
+      .panel:last-child {
+        border-right: 0;
+      }
+      h1, h2, h3 {
+        margin: 0 0 0.75rem;
+      }
+      p, label, li, small {
+        color: var(--muted);
+        line-height: 1.5;
+      }
+      form, .stack {
+        display: grid;
+        gap: 0.75rem;
+      }
+      .section {
+        margin-top: 1.5rem;
+      }
+      .surface {
+        background: var(--surface);
+        border: 1px solid var(--line);
+        border-radius: 18px;
+        padding: 1rem;
+        box-shadow: 0 10px 30px rgba(68, 58, 36, 0.06);
+      }
+      input, textarea, select, button {
+        width: 100%;
+        font: inherit;
+      }
+      input, textarea, select {
+        padding: 0.78rem 0.9rem;
+        border-radius: 12px;
+        border: 1px solid var(--line);
+        background: #fffdf9;
+        color: var(--ink);
+      }
+      textarea {
+        min-height: 9rem;
+        resize: vertical;
+      }
+      button {
+        border: 0;
+        border-radius: 999px;
+        padding: 0.78rem 1rem;
+        cursor: pointer;
+        background: var(--accent);
+        color: #f5f7ef;
+        font-weight: 600;
+        transition: transform 140ms ease, background 140ms ease;
+      }
+      button:hover {
+        transform: translateY(-1px);
+        background: var(--accent-strong);
+      }
+      button.secondary {
+        background: rgba(44, 110, 73, 0.12);
+        color: var(--accent-strong);
+      }
+      button.danger {
+        background: rgba(139, 58, 42, 0.12);
+        color: var(--danger);
+      }
+      .project-list, .card-list, .result-list, .tree-list, .collection-items-list {
+        display: grid;
+        gap: 0.75rem;
+      }
+      .project-item, .card-item, .result-item {
+        border: 1px solid var(--line);
+        border-radius: 16px;
+        padding: 0.9rem;
+        background: rgba(255, 255, 255, 0.65);
+      }
+      .project-item.active {
+        border-color: var(--accent);
+        box-shadow: 0 0 0 1px rgba(44, 110, 73, 0.15);
+      }
+      .row {
+        display: flex;
+        gap: 0.6rem;
+        align-items: center;
+      }
+      .row > * {
+        flex: 1;
+      }
+      .meta {
+        font-size: 0.9rem;
+        color: var(--muted);
+      }
+      .status {
+        min-height: 1.4rem;
+        font-size: 0.95rem;
+        color: var(--accent-strong);
+      }
+      .status.error {
+        color: var(--danger);
+      }
+      .empty {
+        padding: 1rem;
+        border: 1px dashed var(--line);
+        border-radius: 16px;
+        color: var(--muted);
+      }
+      .tree-node {
+        display: grid;
+        gap: 0.35rem;
+      }
+      .tree-row {
+        display: flex;
+        align-items: center;
+        gap: 0.45rem;
+      }
+      .tree-toggle {
+        width: 1.6rem;
+        min-width: 1.6rem;
+        height: 1.6rem;
+        padding: 0;
+        border-radius: 10px;
+        background: rgba(44, 110, 73, 0.08);
+        color: var(--accent-strong);
+      }
+      .tree-label {
+        width: 100%;
+        text-align: left;
+        border: 1px solid transparent;
+        border-radius: 12px;
+        padding: 0.55rem 0.7rem;
+        background: rgba(255, 255, 255, 0.6);
+        color: var(--ink);
+      }
+      .tree-label.active {
+        border-color: rgba(44, 110, 73, 0.22);
+        background: rgba(44, 110, 73, 0.12);
+      }
+      .tree-children {
+        display: grid;
+        gap: 0.35rem;
+        margin-left: 1rem;
+        padding-left: 0.6rem;
+        border-left: 1px dashed var(--line);
+      }
+      .collection-item {
+        display: grid;
+        gap: 0.35rem;
+        padding: 0.75rem;
+        border: 1px solid var(--line);
+        border-radius: 14px;
+        background: rgba(255, 255, 255, 0.62);
+      }
+      .checkbox-row {
+        display: flex;
+        align-items: flex-start;
+        gap: 0.6rem;
+      }
+      .checkbox-row input[type="checkbox"] {
+        width: auto;
+        margin-top: 0.3rem;
+      }
+      .action-bar {
+        display: grid;
+        gap: 0.55rem;
+        padding-top: 0.4rem;
+        border-top: 1px solid var(--line);
+      }
+      .modal-shell[hidden] {
+        display: none;
+      }
+      .modal-shell {
+        position: fixed;
+        inset: 0;
+        z-index: 40;
+      }
+      .modal-overlay {
+        position: absolute;
+        inset: 0;
+        border-radius: 0;
+        background: rgba(24, 28, 22, 0.42);
+      }
+      .modal-card {
+        position: relative;
+        z-index: 1;
+        width: min(1100px, calc(100vw - 2rem));
+        max-height: calc(100vh - 2rem);
+        margin: 1rem auto;
+        display: grid;
+        grid-template-rows: auto auto 1fr auto;
+        background: var(--surface);
+        border: 1px solid var(--line);
+        border-radius: 24px;
+        box-shadow: 0 24px 60px rgba(35, 31, 21, 0.2);
+        overflow: hidden;
+      }
+      .modal-header,
+      .modal-action-bar {
+        display: flex;
+        align-items: center;
+        justify-content: space-between;
+        gap: 0.75rem;
+        padding: 1rem 1.25rem;
+        border-bottom: 1px solid var(--line);
+      }
+      .modal-action-bar {
+        border-top: 1px solid var(--line);
+        border-bottom: 0;
+      }
+      .modal-header-actions {
+        display: flex;
+        align-items: center;
+        gap: 0.75rem;
+        flex-wrap: wrap;
+      }
+      .modal-body {
+        display: grid;
+        grid-template-columns: minmax(280px, 0.9fr) minmax(0, 1.2fr);
+        min-height: 24rem;
+      }
+      .modal-pane {
+        display: grid;
+        gap: 0.6rem;
+        padding: 1rem 1.25rem;
+        min-height: 0;
+      }
+      .modal-scroll {
+        min-height: 0;
+        overflow: auto;
+      }
+      .preview-popover {
+        position: absolute;
+        max-width: 28rem;
+        padding: 0.85rem 1rem;
+        border: 1px solid var(--line);
+        border-radius: 16px;
+        background: rgba(255, 253, 248, 0.98);
+        box-shadow: 0 18px 40px rgba(35, 31, 21, 0.16);
+        color: var(--ink);
+      }
+      .tabs {
+        display: flex;
+        gap: 0.5rem;
+      }
+      .tabs button {
+        background: rgba(44, 110, 73, 0.08);
+        color: var(--accent-strong);
+      }
+      .tabs button.active {
+        background: var(--accent);
+        color: #f5f7ef;
+      }
+      .tab-panel[hidden] {
+        display: none;
+      }
+      pre {
+        margin: 0;
+        white-space: pre-wrap;
+        word-break: break-word;
+      }
+      @media (max-width: 980px) {
+        .layout {
+          grid-template-columns: 1fr;
+        }
+        .panel {
+          border-right: 0;
+          border-bottom: 1px solid var(--line);
+        }
+        .modal-card {
+          width: calc(100vw - 1rem);
+          margin: 0.5rem auto;
+          max-height: calc(100vh - 1rem);
+        }
+        .modal-body {
+          grid-template-columns: 1fr;
+          grid-template-rows: minmax(12rem, 1fr) minmax(12rem, 1fr);
+        }
+        .modal-header,
+        .modal-action-bar {
+          flex-wrap: wrap;
+        }
+      }
+    </style>
+  </head>
+  <body>
+    <main class="layout">
+      <section class="panel">
+        <h1>Zotero KB</h1>
+        <p>创建项目，按 Zotero collection 树批量导入文献，再在项目范围内做引用推荐与引用方案。</p>
+
+        <div class="section surface">
+          <h3>创建项目</h3>
+          <form id="create-project-form" class="stack">
+            <input id="project-id" name="project_id" placeholder="project-id，例如 thesis-ch2" required />
+            <input id="project-name" name="name" placeholder="项目名称" required />
+            <div class="row">
+              <input id="llm-provider" name="llm_provider" value="deepseek" />
+              <input id="llm-model" name="llm_model" value="deepseek-chat" />
+            </div>
+            <button type="submit">创建项目</button>
+          </form>
+          <div id="project-status" class="status"></div>
+        </div>
+
+        <div class="section surface">
+          <div class="row" style="justify-content: space-between">
+            <h3>项目列表</h3>
+            <button id="refresh-projects-button" type="button" class="secondary">刷新</button>
+          </div>
+          <div id="project-list" class="project-list"></div>
+        </div>
+
+        <div class="section surface">
+          <h3>导入文献</h3>
+          <p class="meta">打开子界面浏览 Zotero collection 树，再批量导入到当前项目。</p>
+          <button id="open-import-modal-button" type="button">导入文献</button>
+        </div>
+
+        <div id="import-modal" class="modal-shell" hidden aria-hidden="true">
+          <button id="import-modal-overlay" class="modal-overlay" type="button" aria-label="关闭导入弹窗"></button>
+          <section class="modal-card" role="dialog" aria-modal="true" aria-labelledby="import-modal-title">
+            <header class="modal-header">
+              <div>
+                <h3 id="import-modal-title">Import From Zotero</h3>
+                <p id="import-modal-project-label" class="meta">未选择项目</p>
+              </div>
+              <div class="modal-header-actions">
+                <div id="modal-selected-count" class="meta">已选 0 篇</div>
+                <button id="close-import-modal-button" type="button" class="secondary">关闭</button>
+              </div>
+            </header>
+            <div id="collection-status" class="status"></div>
+            <div class="modal-body">
+              <div class="modal-pane">
+                <small>Collections</small>
+                <div id="modal-collection-tree" class="modal-scroll tree-list"></div>
+              </div>
+              <div class="modal-pane">
+                <small>Collection Items</small>
+                <div id="modal-collection-items" class="modal-scroll collection-items-list"></div>
+              </div>
+            </div>
+            <footer class="modal-action-bar">
+              <button id="modal-select-descendants-button" type="button" class="secondary">全选当前目录及子目录</button>
+              <button id="modal-clear-selection-button" type="button" class="danger">清空选择</button>
+              <button id="modal-import-selected-items-button" type="button">导入所选到当前项目</button>
+            </footer>
+            <div id="item-preview-popover" class="preview-popover" hidden></div>
+          </section>
+        </div>
+      </section>
+
+      <section class="panel">
+        <div class="row" style="justify-content: space-between">
+          <div>
+            <h2>Cards</h2>
+            <p id="current-project-label">当前未选择项目。</p>
+          </div>
+          <button id="reload-cards-button" type="button" class="secondary">刷新卡片</button>
+        </div>
+
+        <div id="card-list" class="card-list"></div>
+
+        <div class="section surface">
+          <h3>卡片详情</h3>
+          <div id="card-detail" class="empty">点击卡片后，这里会显示摘要、claims 和可引用内容。</div>
+        </div>
+      </section>
+
+      <section class="panel">
+        <h2>Writing</h2>
+        <p>两个入口独立：候选引用推荐和初版引用方案。</p>
+
+        <div class="tabs">
+          <button id="recommend-tab" type="button" class="active">引用推荐</button>
+          <button id="plan-tab" type="button">引用方案</button>
+        </div>
+
+        <section id="recommend-panel" class="tab-panel section surface">
+          <form id="recommend-form" class="stack">
+            <textarea id="recommend-prompt" placeholder="输入本段写作意图或草稿"></textarea>
+            <button type="submit">生成候选引用</button>
+          </form>
+          <div id="recommend-status" class="status"></div>
+          <div id="recommend-results" class="result-list"></div>
+        </section>
+
+        <section id="plan-panel" class="tab-panel section surface" hidden>
+          <form id="plan-form" class="stack">
+            <textarea id="plan-prompt" placeholder="输入本段写作意图"></textarea>
+            <button type="submit">生成初版引用方案</button>
+          </form>
+          <div id="plan-status" class="status"></div>
+          <div id="plan-results" class="result-list"></div>
+        </section>
+      </section>
+    </main>
+
+    <script>
+      const ABSTRACT_PREVIEW_DELAY_MS = 3000;
+
+      const state = {
+        projects: [],
+        currentProjectId: null,
+        currentCards: [],
+        collectionTree: [],
+        isImportModalOpen: false,
+        selectedCollectionKey: null,
+        expandedCollectionKeys: new Set(),
+        selectedItemKeys: new Set(),
+        visibleCollectionItems: [],
+      };
+
+      const elements = {
+        projectForm: document.getElementById("create-project-form"),
+        projectStatus: document.getElementById("project-status"),
+        projectList: document.getElementById("project-list"),
+        collectionStatus: document.getElementById("collection-status"),
+        collectionTree: document.getElementById("collection-tree"),
+        collectionItems: document.getElementById("collection-items"),
+        selectedCount: document.getElementById("selected-count"),
+        selectDescendantsButton: document.getElementById("select-descendants-button"),
+        clearSelectionButton: document.getElementById("clear-selection-button"),
+        importSelectedItemsButton: document.getElementById("import-selected-items-button"),
+        currentProjectLabel: document.getElementById("current-project-label"),
+        cardList: document.getElementById("card-list"),
+        cardDetail: document.getElementById("card-detail"),
+        reloadCardsButton: document.getElementById("reload-cards-button"),
+        refreshProjectsButton: document.getElementById("refresh-projects-button"),
+        recommendForm: document.getElementById("recommend-form"),
+        recommendStatus: document.getElementById("recommend-status"),
+        recommendResults: document.getElementById("recommend-results"),
+        planForm: document.getElementById("plan-form"),
+        planStatus: document.getElementById("plan-status"),
+        planResults: document.getElementById("plan-results"),
+        recommendTab: document.getElementById("recommend-tab"),
+        planTab: document.getElementById("plan-tab"),
+        recommendPanel: document.getElementById("recommend-panel"),
+        planPanel: document.getElementById("plan-panel"),
+      };
+
+      function setStatus(target, message, isError = false) {
+        target.textContent = message || "";
+        target.classList.toggle("error", Boolean(isError));
+      }
+
+      async function api(path, options = {}) {
+        const response = await fetch(path, {
+          headers: { "Content-Type": "application/json", ...(options.headers || {}) },
+          ...options,
+        });
+        if (!response.ok) {
+          const payload = await response.json().catch(() => ({ detail: response.statusText }));
+          throw new Error(payload.detail || response.statusText);
+        }
+        const contentType = response.headers.get("content-type") || "";
+        if (contentType.includes("application/json")) {
+          return response.json();
+        }
+        return response.text();
+      }
+
+      function renderProjects() {
+        if (!state.projects.length) {
+          elements.projectList.innerHTML = '<div class="empty">还没有项目。先在上方创建一个。</div>';
+          return;
+        }
+
+        elements.projectList.innerHTML = "";
+        for (const project of state.projects) {
+          const item = document.createElement("button");
+          item.type = "button";
+          item.className = "project-item" + (project.id === state.currentProjectId ? " active" : "");
+          item.innerHTML = `
+            <strong>${project.name}</strong>
+            <div class="meta">${project.id}</div>
+            <div class="meta">${project.llm?.provider || "deterministic"} / ${project.llm?.model || "-"}</div>
+          `;
+          item.addEventListener("click", () => selectProject(project.id));
+          elements.projectList.appendChild(item);
+        }
+      }
+
+      function renderCards(cards) {
+        state.currentCards = cards || [];
+        if (!state.currentCards.length) {
+          elements.cardList.innerHTML = '<div class="empty">当前项目还没有卡片。先导入 Zotero 选中文献。</div>';
+          elements.cardDetail.innerHTML = '<div class="empty">导入后点击卡片查看详情。</div>';
+          return;
+        }
+
+        elements.cardList.innerHTML = "";
+        for (const card of state.currentCards) {
+          const item = document.createElement("div");
+          item.className = "card-item";
+          item.innerHTML = `
+            <strong>${card.title}</strong>
+            <div class="meta">${card.item_key}</div>
+            <p>${card.summary || "暂无摘要"}</p>
+            <div class="row">
+              <button type="button" class="secondary">查看详情</button>
+              <button type="button" class="danger">移出项目</button>
+            </div>
+          `;
+          const [detailButton, removeButton] = item.querySelectorAll("button");
+          detailButton.addEventListener("click", () => showCardDetail(card));
+          removeButton.addEventListener("click", () => removeCard(card.item_key));
+          elements.cardList.appendChild(item);
+        }
+      }
+
+      function showCardDetail(card) {
+        const claims = (card.claims || []).map((claim) => `<li>${claim}</li>`).join("") || "<li>暂无 claims</li>";
+        const quotes = (card.quotable_spans || []).map((quote) => `<li>${quote}</li>`).join("") || "<li>暂无可引用片段</li>";
+        elements.cardDetail.innerHTML = `
+          <strong>${card.title}</strong>
+          <div class="meta">${card.item_key}</div>
+          <p>${card.summary || "暂无摘要"}</p>
+          <h4>Claims</h4>
+          <ul>${claims}</ul>
+          <h4>Quotable</h4>
+          <ul>${quotes}</ul>
+        `;
+      }
+
+      function renderRecommendationResults(results) {
+        if (!results.length) {
+          elements.recommendResults.innerHTML = '<div class="empty">没有匹配到候选引用。</div>';
+          return;
+        }
+        elements.recommendResults.innerHTML = results.map((item) => `
+          <div class="result-item">
+            <strong>${item.title}</strong>
+            <div class="meta">${item.item_key}</div>
+            <p>${item.why_relevant}</p>
+            <pre>${(item.claims || []).join("\n")}</pre>
+          </div>
+        `).join("");
+      }
+
+      function renderPlanResults(sections) {
+        if (!sections.length) {
+          elements.planResults.innerHTML = '<div class="empty">没有生成方案。</div>';
+          return;
+        }
+        elements.planResults.innerHTML = sections.map((section) => `
+          <div class="result-item">
+            <strong>${section.heading}</strong>
+            <p>${section.goal}</p>
+            <div class="meta">${(section.citations || []).map((item) => `${item.title} (${item.role})`).join(" · ")}</div>
+            <pre>${(section.notes || []).join("\n")}</pre>
+          </div>
+        `).join("");
+      }
+
+      function renderCollectionTree() {
+        if (!state.collectionTree.length) {
+          elements.collectionTree.innerHTML = '<div class="empty">没有读取到 Zotero collections。</div>';
+          return;
+        }
+        elements.collectionTree.innerHTML = "";
+        for (const node of state.collectionTree) {
+          elements.collectionTree.appendChild(renderCollectionNode(node));
+        }
+      }
+
+      function renderCollectionNode(node) {
+        const wrapper = document.createElement("div");
+        wrapper.className = "tree-node";
+
+        const row = document.createElement("div");
+        row.className = "tree-row";
+
+        const toggle = document.createElement("button");
+        toggle.type = "button";
+        toggle.className = "tree-toggle";
+        toggle.textContent = node.children && node.children.length
+          ? (state.expandedCollectionKeys.has(node.collection_key) ? "−" : "+")
+          : "·";
+        toggle.disabled = !(node.children && node.children.length);
+        toggle.addEventListener("click", () => toggleCollectionExpanded(node.collection_key));
+
+        const label = document.createElement("button");
+        label.type = "button";
+        label.className = "tree-label" + (state.selectedCollectionKey === node.collection_key ? " active" : "");
+        label.innerHTML = `
+          <strong>${node.name}</strong>
+          <div class="meta">${node.descendant_item_count} 篇</div>
+        `;
+        label.addEventListener("click", () => selectCollection(node.collection_key));
+
+        row.appendChild(toggle);
+        row.appendChild(label);
+        wrapper.appendChild(row);
+
+        if (node.children && node.children.length && state.expandedCollectionKeys.has(node.collection_key)) {
+          const children = document.createElement("div");
+          children.className = "tree-children";
+          for (const child of node.children) {
+            children.appendChild(renderCollectionNode(child));
+          }
+          wrapper.appendChild(children);
+        }
+        return wrapper;
+      }
+
+      function renderCollectionItems() {
+        renderSelectedCount();
+        if (!state.selectedCollectionKey) {
+          elements.collectionItems.innerHTML = '<div class="empty">先点击一个 collection。</div>';
+          return;
+        }
+        if (!state.visibleCollectionItems.length) {
+          elements.collectionItems.innerHTML = '<div class="empty">当前目录及子目录下没有可导入文献。</div>';
+          return;
+        }
+
+        elements.collectionItems.innerHTML = "";
+        for (const item of state.visibleCollectionItems) {
+          const row = document.createElement("label");
+          row.className = "collection-item";
+          row.innerHTML = `
+            <div class="checkbox-row">
+              <input type="checkbox" ${state.selectedItemKeys.has(item.item_key) ? "checked" : ""} />
+              <div>
+                <strong>${item.title}</strong>
+                <div class="meta">${item.item_key} · ${item.year || "-"} · ${item.item_type || "-"}</div>
+                <p>${item.abstract || "暂无摘要"}</p>
+              </div>
+            </div>
+          `;
+          const checkbox = row.querySelector('input[type="checkbox"]');
+          checkbox.addEventListener("change", (event) => {
+            toggleItemSelection(item.item_key, event.target.checked);
+          });
+          elements.collectionItems.appendChild(row);
+        }
+      }
+
+      function renderSelectedCount() {
+        elements.selectedCount.textContent = `已选 ${state.selectedItemKeys.size} 篇`;
+      }
+
+      function toggleItemSelection(itemKey, checked) {
+        if (checked) {
+          state.selectedItemKeys.add(itemKey);
+        } else {
+          state.selectedItemKeys.delete(itemKey);
+        }
+        renderSelectedCount();
+      }
+
+      function toggleCollectionExpanded(collectionKey) {
+        if (state.expandedCollectionKeys.has(collectionKey)) {
+          state.expandedCollectionKeys.delete(collectionKey);
+        } else {
+          state.expandedCollectionKeys.add(collectionKey);
+        }
+        renderCollectionTree();
+      }
+
+      async function loadProjects() {
+        const projects = await api("/api/projects");
+        state.projects = projects;
+        if (!state.currentProjectId && projects.length) {
+          state.currentProjectId = projects[0].id;
+        }
+        renderProjects();
+        if (state.currentProjectId) {
+          await selectProject(state.currentProjectId, false);
+        }
+      }
+
+      async function selectProject(projectId, rerender = true) {
+        state.currentProjectId = projectId;
+        elements.currentProjectLabel.textContent = `当前项目：${projectId}`;
+        if (rerender) {
+          renderProjects();
+        }
+        const payload = await api(`/api/projects/${projectId}/cards`);
+        renderCards(payload.cards || []);
+      }
+
+      async function removeCard(itemKey) {
+        if (!state.currentProjectId) {
+          return;
+        }
+        await api(`/api/projects/${state.currentProjectId}/items/${itemKey}`, { method: "DELETE" });
+        await selectProject(state.currentProjectId);
+      }
+
+      async function loadCollectionTree() {
+        const payload = await api("/api/zotero/collections/tree");
+        state.collectionTree = payload.collections || [];
+        if (!state.selectedCollectionKey && state.collectionTree.length) {
+          state.selectedCollectionKey = state.collectionTree[0].collection_key;
+          state.expandedCollectionKeys.add(state.selectedCollectionKey);
+        }
+        renderCollectionTree();
+        if (state.selectedCollectionKey) {
+          await selectCollection(state.selectedCollectionKey, false);
+        }
+      }
+
+      async function selectCollection(collectionKey, rerenderTree = true) {
+        state.selectedCollectionKey = collectionKey;
+        const payload = await api(`/api/zotero/collections/${collectionKey}/items?include_descendants=true`);
+        state.visibleCollectionItems = payload.items || [];
+        if (rerenderTree) {
+          renderCollectionTree();
+        }
+        renderCollectionItems();
+      }
+
+      elements.projectForm.addEventListener("submit", async (event) => {
+        event.preventDefault();
+        const formData = new FormData(elements.projectForm);
+        try {
+          await api("/api/projects", {
+            method: "POST",
+            body: JSON.stringify(Object.fromEntries(formData.entries())),
+          });
+          setStatus(elements.projectStatus, "项目已创建。");
+          elements.projectForm.reset();
+          document.getElementById("llm-provider").value = "deepseek";
+          document.getElementById("llm-model").value = "deepseek-chat";
+          await loadProjects();
+        } catch (error) {
+          setStatus(elements.projectStatus, error.message, true);
+        }
+      });
+
+      async function importItemKeys(itemKeys) {
+        if (!state.currentProjectId) {
+          setStatus(elements.collectionStatus, "请先选择项目。", true);
+          return;
+        }
+        try {
+          const payload = await api(`/api/projects/${state.currentProjectId}/imports/item-keys`, {
+            method: "POST",
+            body: JSON.stringify({ item_keys: itemKeys }),
+          });
+          setStatus(elements.collectionStatus, `已导入 ${payload.imported_item_keys.length} 篇文献。`);
+          renderCards(payload.project_view.cards || []);
+          state.selectedItemKeys.clear();
+          renderCollectionItems();
+        } catch (error) {
+          setStatus(elements.collectionStatus, error.message, true);
+        }
+      }
+
+      elements.reloadCardsButton.addEventListener("click", async () => {
+        if (!state.currentProjectId) {
+          return;
+        }
+        await selectProject(state.currentProjectId);
+      });
+
+      elements.refreshProjectsButton.addEventListener("click", loadProjects);
+
+      elements.selectDescendantsButton.addEventListener("click", () => {
+        for (const item of state.visibleCollectionItems) {
+          state.selectedItemKeys.add(item.item_key);
+        }
+        renderCollectionItems();
+      });
+
+      elements.clearSelectionButton.addEventListener("click", () => {
+        state.selectedItemKeys.clear();
+        renderCollectionItems();
+      });
+
+      elements.importSelectedItemsButton.addEventListener("click", async () => {
+        await importItemKeys(Array.from(state.selectedItemKeys));
+      });
+
+      elements.recommendForm.addEventListener("submit", async (event) => {
+        event.preventDefault();
+        if (!state.currentProjectId) {
+          setStatus(elements.recommendStatus, "请先选择项目。", true);
+          return;
+        }
+        const prompt = document.getElementById("recommend-prompt").value.trim();
+        try {
+          const payload = await api(`/api/projects/${state.currentProjectId}/writing/recommend-citations`, {
+            method: "POST",
+            body: JSON.stringify({ prompt }),
+          });
+          setStatus(elements.recommendStatus, `返回 ${payload.results.length} 条候选引用。`);
+          renderRecommendationResults(payload.results || []);
+        } catch (error) {
+          setStatus(elements.recommendStatus, error.message, true);
+        }
+      });
+
+      elements.planForm.addEventListener("submit", async (event) => {
+        event.preventDefault();
+        if (!state.currentProjectId) {
+          setStatus(elements.planStatus, "请先选择项目。", true);
+          return;
+        }
+        const prompt = document.getElementById("plan-prompt").value.trim();
+        try {
+          const payload = await api(`/api/projects/${state.currentProjectId}/writing/generate-plan`, {
+            method: "POST",
+            body: JSON.stringify({ prompt }),
+          });
+          setStatus(elements.planStatus, `生成 ${payload.sections.length} 个方案段落。`);
+          renderPlanResults(payload.sections || []);
+        } catch (error) {
+          setStatus(elements.planStatus, error.message, true);
+        }
+      });
+
+      function activateTab(name) {
+        const isRecommend = name === "recommend";
+        elements.recommendTab.classList.toggle("active", isRecommend);
+        elements.planTab.classList.toggle("active", !isRecommend);
+        elements.recommendPanel.hidden = !isRecommend;
+        elements.planPanel.hidden = isRecommend;
+      }
+
+      elements.recommendTab.addEventListener("click", () => activateTab("recommend"));
+      elements.planTab.addEventListener("click", () => activateTab("plan"));
+
+      Promise.all([loadProjects(), loadCollectionTree()]).catch((error) => {
+        setStatus(elements.projectStatus, error.message, true);
+        setStatus(elements.collectionStatus, error.message, true);
+      });
+    </script>
+  </body>
+</html>
