10 files changed, 1204 insertions, 0 deletions
diff --git a/frontend/src/components/Chart.svelte b/frontend/src/components/Chart.svelte
new file mode 100644
index 0000000..ca8f4f8
--- /dev/null
+++ b/frontend/src/components/Chart.svelte
@@ -0,0 +1,67 @@
+<script lang="ts">
+  import { onMount, onDestroy } from 'svelte';
+  import type * as echartsNS from 'echarts';
+
+  interface Props {
+    option: echartsNS.EChartsOption;
+    height?: number;
+    ariaLabel?: string;
+  }
+  let { option, height = 360, ariaLabel = '图表' }: Props = $props();
+
+  let host: HTMLDivElement;
+  let chart: echartsNS.ECharts | null = null;
+  let observer: ResizeObserver | null = null;
+
+  onMount(async () => {
+    // ECharts chunk loads lazily when a result/comparison view is opened.
+    const echarts = (await import('echarts')) as typeof echartsNS;
+    if (!host) return;
+    // Pass explicit sizes when the host has no layout yet (jsdom regression
+    // tests report 0×0 and ECharts warns "Can't get DOM width or height").
+    // In a real browser clientWidth/clientHeight are non-zero, so the measured
+    // size is used exactly as before; responsive resizing still works through
+    // the ResizeObserver below.
+    chart = echarts.init(host, undefined, {
+      renderer: 'svg',
+      width: host.clientWidth || 640,
+      height: host.clientHeight || height
+    });
+    observer = new ResizeObserver(() => {
+      if (!chart) return;
+      // re-measure on EVERY resize callback and pass the measured size
+      // explicitly: echarts keeps the width given at init/resize, so a
+      // desktop->mobile viewport change would otherwise leave the SVG at the
+      // old width and overflow the page (real, re-verified live bug).
+      const w = host.clientWidth || undefined;
+      const h = host.clientHeight || undefined;
+      if (w === undefined && h === undefined) return;
+      chart.resize({ width: w, height: h });
+    });
+    observer.observe(host);
+    chart?.setOption(option, { notMerge: true });
+  });
+
+  onDestroy(() => {
+    observer?.disconnect();
+    chart?.dispose();
+    chart = null;
+  });
+
+  $effect(() => {
+    chart?.setOption(option, { notMerge: true });
+  });
+</script>
+
+<div
+  bind:this={host}
+  style="height:{height}px; width:100%; min-width:0;"
+  role="img"
+  aria-label={ariaLabel}
+></div>
+
+<style>
+  div {
+    display: block;
+  }
+</style>
diff --git a/frontend/src/components/CodeEditor.svelte b/frontend/src/components/CodeEditor.svelte
new file mode 100644
index 0000000..544a6a4
--- /dev/null
+++ b/frontend/src/components/CodeEditor.svelte
@@ -0,0 +1,104 @@
+<script lang="ts">
+  import { onMount, onDestroy } from 'svelte';
+  import { EditorView, keymap, drawSelection } from '@codemirror/view';
+  import { EditorState, StateEffect } from '@codemirror/state';
+  import { python } from '@codemirror/lang-python';
+  import { indentWithTab } from '@codemirror/commands';
+  import { defaultKeymap, history, historyKeymap } from '@codemirror/commands';
+
+  interface Props {
+    value: string;
+    onInput: (v: string) => void;
+    height?: number;
+    readOnly?: boolean;
+    label?: string;
+  }
+  let { value, onInput, height = 420, readOnly = false, label }: Props = $props();
+
+  let host: HTMLDivElement;
+  let view: EditorView | null = null;
+  let applyingExternal = false;
+  // svelte-ignore state_referenced_locally
+  let handler = onInput;
+  $effect(() => {
+    handler = onInput;
+  });
+
+  const setDoc = StateEffect.define<string>();
+
+  onMount(() => {
+    view = new EditorView({
+      parent: host,
+      state: EditorState.create({
+        doc: value ?? '',
+        extensions: [
+          readOnly ? EditorView.editable.of(false) : [],
+          history(),
+          drawSelection(),
+          keymap.of([...defaultKeymap, ...historyKeymap, indentWithTab]),
+          python(),
+          EditorView.lineWrapping,
+          EditorView.theme({
+            '&': {
+              fontSize: '13px',
+              background: 'var(--surface)',
+              color: 'var(--text)',
+              fontFamily:
+                "ui-monospace, 'SF Mono', Menlo, Consolas, 'Noto Sans Mono CJK SC', monospace"
+            },
+            '.cm-content': { padding: '10px 0', minHeight: `${height}px` },
+            '.cm-scroller': { lineHeight: '1.55' },
+            '&.cm-focused': { outline: 'none' },
+            '.cm-gutters': {
+              background: 'var(--surface)',
+              border: 'none',
+              color: 'var(--text-3)'
+            },
+            '.cm-activeLine': { background: 'var(--surface-2)' },
+            '.cm-activeLineGutter': { background: 'var(--surface-2)' }
+          }),
+          EditorView.updateListener.of((u) => {
+            if (applyingExternal) return;
+            if (u.docChanged) handler(u.state.doc.toString());
+          })
+        ]
+      })
+    });
+    return () => view?.destroy();
+  });
+
+  $effect(() => {
+    if (!view) return;
+    const current = view.state.doc.toString();
+    if (value !== current) {
+      applyingExternal = true;
+      view.dispatch({ changes: { from: 0, to: current.length, insert: value ?? '' } });
+      applyingExternal = false;
+    }
+  });
+
+  $effect(() => {
+    if (view) {
+      if (readOnly) view.contentDOM.setAttribute('aria-readonly', 'true');
+      else view.contentDOM.removeAttribute('aria-readonly');
+    }
+  });
+
+  onDestroy(() => view?.destroy());
+</script>
+
+<div>
+  {#if label}<span class="hint editor-label">{label}</span>{/if}
+  <div bind:this={host} class="cm-host"></div>
+</div>
+
+<style>
+  .cm-host {
+    border: 1px solid var(--border-strong);
+    border-radius: var(--radius);
+    overflow: hidden;
+    background: var(--surface);
+  }
+  .cm-host :global(.cm-editor) { min-height: 60px; }
+  .editor-label { display: block; margin-bottom: 0.25rem; }
+</style>
diff --git a/frontend/src/components/DatasetCard.svelte b/frontend/src/components/DatasetCard.svelte
new file mode 100644
index 0000000..7b38874
--- /dev/null
+++ b/frontend/src/components/DatasetCard.svelte
@@ -0,0 +1,157 @@
+<script lang="ts">
+  import Status from './Status.svelte';
+  import { getDataset, getDatasetPreview } from '../lib/client';
+  import { extractStatusMessage } from '../lib/state';
+  import { adjustmentLabel, assetTypeLabel, instrumentLabel, datasetStatusLabel, fmtDate } from '../lib/format';
+  import { summarizeCoverage } from '../lib/coverage';
+  import type { Dataset, DatasetPreview } from '../lib/types';
+
+  interface Props {
+    dsId: string;
+  }
+  let { dsId }: Props = $props();
+
+  let ds = $state<Dataset | null>(null);
+  let error: string | null = $state(null);
+  let busy = $state(true);
+  let showPreview = $state(false);
+  let preview = $state<DatasetPreview | null>(null);
+  let previewBusy = $state(false);
+  let previewError: string | null = $state(null);
+  let pollTimer: ReturnType<typeof setInterval> | null = null;
+
+  function stopPolling() {
+    if (pollTimer) {
+      clearInterval(pollTimer);
+      pollTimer = null;
+    }
+  }
+
+  $effect(() => {
+    void load();
+    return stopPolling;
+  });
+
+  async function load() {
+    error = null;
+    try {
+      ds = await getDataset(dsId);
+      if (ds.status === 'pending' || ds.status === 'running') {
+        if (!pollTimer) {
+          pollTimer = setInterval(() => {
+            void load();
+          }, 2000);
+        }
+      } else {
+        stopPolling();
+      }
+    } catch (e) {
+      error = extractStatusMessage(e);
+    } finally {
+      busy = false;
+    }
+  }
+
+  async function togglePreview() {
+    showPreview = !showPreview;
+    if (showPreview && !preview && ds?.status === 'ready') {
+      previewBusy = true;
+      previewError = null;
+      try {
+        preview = await getDatasetPreview(dsId);
+      } catch (e) {
+        previewError = `预览加载失败：${extractStatusMessage(e)}`;
+      } finally {
+        previewBusy = false;
+      }
+    }
+  }
+</script>
+
+<div class="card">
+  {#if ds}
+    <div class="spread">
+      <div>
+        <strong>{ds.name ?? '未命名数据集'}</strong>
+        {#if ds.manifest_hash}<span class="hint mono">manifest {ds.manifest_hash.slice(0, 10)}…</span>{/if}
+        {#if ds.cache_hit}<span class="badge teal">缓存命中 · 复用现有物化对象</span>{/if}
+      </div>
+      <span class="badge {ds.status === 'ready' ? 'ok' : ds.status === 'failed' ? 'danger' : 'warn'}">
+        {datasetStatusLabel[ds.status]}
+      </span>
+    </div>
+    <table class="data kv">
+      <tbody>
+        <tr><th>请求标的</th><td>{(ds.request.instruments ?? []).map(instrumentLabel).join('；')}</td></tr>
+        <tr><th>范围</th><td>{ds.request.start_date} ~ {ds.request.end_date} · {ds.request.frequency} · {adjustmentLabel[ds.request.adjustment] ?? ds.request.adjustment}</td></tr>
+        <tr><th>字段</th><td>{(ds.request.fields ?? []).join(', ')}</td></tr>
+        <tr><th>创建时间</th><td>{fmtDate(ds.created_at)}</td></tr>
+      </tbody>
+    </table>
+    {#if ds.status === 'failed'}
+      <div class="banner error" role="alert"><span aria-hidden="true">✕</span><span>{ds.error ?? '数据获取失败'}</span></div>
+    {/if}
+    {#if ds.status !== 'ready'}
+      <p class="hint">{ds.status === 'pending' || ds.status === 'running' ? '获取中，完成后可预览覆盖情况' : ''}</p>
+    {/if}
+    {#if ds.status === 'ready'}
+      <div>
+        <button class="btn small" aria-expanded={showPreview} onclick={togglePreview}>
+          {showPreview ? '收起预览' : '查看数据覆盖预览'}
+        </button>
+      </div>
+      {#if showPreview}
+        <div class="preview-box">
+          <Status busy={previewBusy} busyText="加载预览…" error={previewError} empty={null} />
+          {#if preview}
+            {@const cov = summarizeCoverage(preview.coverage ?? [])}
+            {#if cov.warnings.length > 0}
+              <div class="banner warn"><span aria-hidden="true">⚠</span><div>
+                <div class="cov-caption">覆盖差异（共有区间 {cov.common.start ?? '—'} ~ {cov.common.end ?? '—'}）：</div>
+                <ul class="cov-list">
+                  {#each cov.warnings as w, i (i)}<li>{w}</li>{/each}
+                </ul>
+                {#if (preview.coverage ?? []).some((c) => c.warnings)}
+                  <ul class="cov-list">
+                    {#each preview.coverage.filter((c) => c.warnings) as c (c.instrument)}
+                      <li>{c.instrument}：{(c.warnings ?? []).join('；')}</li>
+                    {/each}
+                  </ul>
+                {/if}
+              </div></div>
+            {:else if cov.common.start}
+              <div class="banner info">
+                <span aria-hidden="true">✓</span>
+                <span>覆盖平稳：共有可用区间 {cov.common.start} ~ {cov.common.end}。可以直接用于回测。</span>
+              </div>
+            {/if}
+            <table class="data scrollx">
+              <thead>
+                <tr>{#each preview.columns as c (c)}<th>{c}</th>{/each}</tr>
+              </thead>
+              <tbody>
+                {#each preview.rows as row, i (i)}
+                  <tr>{#each preview.columns as c (c)}<td class="num">{row[c]}</td>{/each}</tr>
+                {/each}
+              </tbody>
+            </table>
+            {#if preview.truncated}
+              <p class="hint">预览仅展示部分行</p>
+            {/if}
+          {/if}
+        </div>
+      {/if}
+    {/if}
+  {:else}
+    <Status busy={busy} error={error} busyText="载入数据集…" empty={null} />
+  {/if}
+</div>
+
+<style>
+  .kv th { width: 110px; color: var(--text-2); font-weight: 500; min-width: 110px; }
+  .mono { font-family: var(--mono); margin-left: 0.5rem; }
+  .preview-box { margin-top: 0.5rem; display: grid; gap: 0.5rem; }
+  .scrollx { display: block; overflow-x: auto; }
+  .cov-caption { font-weight: 600; }
+  .cov-list { margin: 0.2rem 0 0 1.1rem; padding: 0; }
+</style>
diff --git a/frontend/src/components/DatasetWizard.svelte b/frontend/src/components/DatasetWizard.svelte
new file mode 100644
index 0000000..1e61d92
--- /dev/null
+++ b/frontend/src/components/DatasetWizard.svelte
@@ -0,0 +1,374 @@
+<script lang="ts">
+  import Status from './Status.svelte';
+  import { getCapabilities, searchInstruments, createDataset } from '../lib/client';
+  import { extractStatusMessage } from '../lib/state';
+  import { adjustmentLabel, assetTypeLabel, itemSourceLabel } from '../lib/format';
+  import { createSearchRunner, SEARCH_EMPTY_MSG } from '../lib/instrumentSearch';
+  import type { Capabilities, Dataset, Instrument } from '../lib/types';
+
+  interface Props {
+    onCreated?: (d: Dataset) => void;
+  }
+  let { onCreated }: Props = $props();
+
+  let caps = $state<Capabilities | null>(null);
+  let loadErr: string | null = $state(null);
+
+  let query = $state('');
+  let searchBusy = $state(false);
+  let searchItems: Instrument[] = $state([]);
+  let searchSource = $state('');
+  let searchErr: string | null = $state(null);
+
+  const searchRunner = createSearchRunner(searchInstruments, {
+    onBusy: () => {
+      searchBusy = true;
+      searchErr = null;
+      searchItems = [];
+    },
+    onResult: (res) => {
+      searchItems = res.items;
+      searchSource = res.source;
+      if (res.items.length === 0 && !searchErr) {
+        searchErr = SEARCH_EMPTY_MSG;
+      }
+    },
+    onError: (message) => {
+      searchItems = [];
+      searchErr = message;
+    },
+    onFinish: () => {
+      searchBusy = false;
+    }
+  });
+
+  function doSearch() {
+    searchRunner.runNow(query);
+  }
+
+  function onSearchInput() {
+    searchRunner.requestDebounced(query);
+  }
+
+  let selected: Instrument[] = $state([]);
+  let symbol = $state('');
+  let market = $state('SH');
+  let assetType = $state('stock');
+  let manualName = $state('');
+
+  let startDate = $state('');
+  let endDate = $state('');
+  let adjustment: 'none' | 'qfq' | 'hfq' = $state('none');
+  let chosenRaw: string[] = $state([]);
+  let dsName = $state('');
+
+  let submitErr: string | null = $state(null);
+  let submitting = $state(false);
+  let formErr: string[] = $state([]);
+  let formOk: string | null = $state(null);
+
+  const maxYears = $derived(caps?.limits.max_years ?? 15);
+  const maxSymbols = $derived(caps?.limits.max_symbols ?? 5);
+  const rawFieldChoices = $derived(caps?.fields.filter((f) => f.raw) ?? []);
+  const baseRequired = $derived(caps?.fields.filter((f) => !f.raw) ?? []);
+
+  $effect(() => {
+    (async () => {
+      try {
+        caps = await getCapabilities();
+      } catch (e) {
+        loadErr = extractStatusMessage(e);
+      }
+    })();
+  });
+
+  function isRaw(code: string) {
+    if (!caps) return false;
+    return !caps.fields.some((f) => f.code === code && !f.raw);
+  }
+
+  function toggleRawField(code: string) {
+    chosenRaw = chosenRaw.includes(code) ? chosenRaw.filter((c) => c !== code) : [...chosenRaw, code];
+  }
+
+  function sameInstrument(a: Instrument, b: Instrument) {
+    return a.market === b.market && a.symbol === b.symbol && a.asset_type === b.asset_type;
+  }
+
+  function addSelection(inst: Instrument) {
+    if (selected.some((s) => sameInstrument(s, inst))) {
+      formErr = [`${inst.market}.${inst.symbol} 已在列表中`];
+      return;
+    }
+    if (selected.length >= maxSymbols) {
+      formErr = [`最多选择 ${maxSymbols} 个标的（能力上限）`];
+      return;
+    }
+    formErr = [];
+    selected = [...selected, inst];
+  }
+
+  function removeSelection(target: Instrument) {
+    selected = selected.filter((s) => !sameInstrument(s, target));
+  }
+
+  function addManual() {
+    const sym = symbol.trim();
+    if (!sym) {
+      formErr = ['请输入确切的代码，例如 600000 或 510300'];
+      return;
+    }
+    const inst: Instrument = {
+      symbol: sym,
+      market: market.trim().toUpperCase(),
+      asset_type: assetType as Instrument['asset_type'],
+      name: manualName.trim() || null,
+      currency: null
+    };
+    addSelection(inst);
+    symbol = '';
+    manualName = '';
+  }
+
+  async function submit() {
+    const errs: string[] = [];
+    if (selected.length === 0) errs.push('至少选择一个标的');
+    if (!/^\d{4}-\d{2}-\d{2}$/.test(startDate)) errs.push('请选择开始日期');
+    if (!/^\d{4}-\d{2}-\d{2}$/.test(endDate)) errs.push('请选择结束日期');
+    if (/^\d{4}-\d{2}-\d{2}$/.test(startDate) && /^\d{4}-\d{2}-\d{2}$/.test(endDate)) {
+      const years = (new Date(endDate).getTime() - new Date(startDate).getTime()) / (365.25 * 86400000);
+      if (!(endDate > startDate)) errs.push('结束日期须晚于开始日期');
+      else if (years > maxYears) errs.push(`范围不能超过 ${maxYears} 年（当前约 ${years.toFixed(1)} 年）`);
+    }
+    if (errs.length > 0) {
+      formErr = errs;
+      return;
+    }
+    formErr = [];
+    formOk = null;
+    submitting = true;
+    submitErr = null;
+    try {
+      const fields = ['open', 'high', 'low', 'close', 'volume'].concat(chosenRaw);
+      const ds = await createDataset({
+        name: dsName.trim() || undefined,
+        instruments: selected,
+        start_date: startDate,
+        end_date: endDate,
+        frequency: 'daily',
+        adjustment,
+        fields
+      });
+      formOk = `数据请求已提交，编号 ${ds.id.slice(0, 8)}…，可在下方列表查看获取进度`;
+      selected = [];
+      startDate = '';
+      endDate = '';
+      dsName = '';
+      chosenRaw = [];
+      onCreated?.(ds);
+    } catch (e) {
+      submitErr = extractStatusMessage(e);
+      if ((e as { details?: { errors?: string[] } }).details?.errors) {
+        formErr = (e as { details: { errors: string[] } }).details.errors;
+      }
+    } finally {
+      submitting = false;
+    }
+  }
+</script>
+
+<div class="card stack">
+  <h2>新建数据集</h2>
+
+  <Status busy={!caps && !loadErr} busyText="加载能力配置…" error={loadErr} empty={null} />
+
+  {#if caps}
+    <section class="stack">
+      <h3 class="step-h">1) 选择标的 <span class="hint">最多 {maxSymbols} 个 · 日频 POC</span></h3>
+      <div class="row">
+        <input
+          style="flex:2 1 200px"
+          placeholder="搜索代码或名称，如 600000、沪深300ETF"
+          bind:value={query}
+          oninput={onSearchInput}
+          onkeydown={(ev) => {
+            if (ev.key === 'Enter') doSearch();
+          }}
+          aria-label="标的搜索"
+        />
+        <button class="btn" disabled={searchBusy || !query.trim()} onclick={() => doSearch()}>
+          {searchBusy ? '搜索中…' : '搜索'}
+        </button>
+      </div>
+      <Status busy={searchBusy} busyText="搜索中…" error={searchErr} empty={null} />
+      {#if searchErr && !searchBusy}
+        <button class="btn small" onclick={() => doSearch()}>重试</button>
+      {/if}
+      {#if searchItems.length > 0}
+        <table class="data">
+          <thead>
+            <tr><th>代码</th><th>类型</th><th>名称</th><th>来源</th><th></th></tr>
+          </thead>
+          <tbody>
+            {#each searchItems as inst (inst.market + '.' + inst.symbol + inst.asset_type + '.' + (inst.source ?? 'unknown'))}
+              <tr>
+                <td class="num">{inst.market}.<strong>{inst.symbol}</strong></td>
+                <td>{assetTypeLabel[inst.asset_type] ?? inst.asset_type}</td>
+                <td>{inst.name ?? '—'}</td>
+                <td class="hint">{itemSourceLabel(inst.source, searchSource)}</td>
+                <td>
+                  <button class="btn small" onclick={() => addSelection(inst)} disabled={inst.asset_type === 'index' && selected.some((s) => sameInstrument(s, inst))}>
+                    {inst.asset_type === 'index' ? '加入（基准研究）' : '加入'}
+                  </button>
+                </td>
+              </tr>
+            {/each}
+          </tbody>
+        </table>
+      {/if}
+
+      <details>
+        <summary>手动录入标的（目录未收录时）</summary>
+        <div class="card stack manual">
+          <p class="hint">仅接受确切标识，不会推断市场或类型。请与供应商页面核对后再录入。</p>
+          <div class="row wrap">
+            <label style="flex:1 1 130px">
+              代码
+              <input bind:value={symbol} placeholder="600000 / 510300 / 000300" />
+            </label>
+            <label style="flex:0 0 110px">
+              市场
+              <select bind:value={market}>
+                {#each ['SH', 'SZ', 'BJ'] as m (m)}
+                  <option value={m}>{m}</option>
+                {/each}
+              </select>
+            </label>
+            <label style="flex:0 0 120px">
+              类型
+              <select bind:value={assetType}>
+                {#each caps.asset_types as t (t)}
+                  <option value={t}>{assetTypeLabel[t] ?? t}</option>
+                {/each}
+              </select>
+            </label>
+            <label style="flex:1 1 160px">
+              名称（可选）
+              <input bind:value={manualName} placeholder="与供应商页面一致" />
+            </label>
+          </div>
+          <div class="row">
+            <button class="btn" onclick={addManual}>加入所选</button>
+          </div>
+        </div>
+      </details>
+    </section>
+
+    <section>
+      <h3 class="step-h">2) 已选标的 <span class="hint">{selected.length}/{maxSymbols}</span></h3>
+      {#if selected.length === 0}
+        <p class="hint">尚未选择标的。指数仅可作研究中枢，不可直接交易。</p>
+      {:else}
+        <ul class="chip-list">
+          {#each selected as s, i (s.market + '.' + s.symbol + s.asset_type)}
+            <li>
+              <span class="num">{s.market}.{s.symbol}</span>
+              {#if s.name}<span class="hint">{s.name}</span>{/if}
+              <span class="badge grey">{assetTypeLabel[s.asset_type] ?? s.asset_type}</span>
+              <button class="btn small ghost" aria-label={`移除 ${s.symbol}`} onclick={() => selected.splice(i, 1)}>✕</button>
+            </li>
+          {/each}
+        </ul>
+      {/if}
+    </section>
+
+    <section class="grid3 wrap-3">
+      <label>
+        起始日期
+        <input type="date" bind:value={startDate} />
+      </label>
+      <label>
+        结束日期
+        <input type="date" bind:value={endDate} />
+      </label>
+      <label style="min-width:160px">
+        复权
+        <select bind:value={adjustment}>
+          {#each caps.adjustments as a (a.code)}
+            <option value={a.code}>{a.label}</option>
+          {/each}
+        </select>
+        {#if adjustment !== 'none'}
+          <p class="hint">{adjustmentLabel[adjustment]}：以复权口径返回</p>
+        {/if}
+        <p class="hint">日频 · 周期上限 {maxYears} 年</p>
+      </label>
+    </section>
+
+    <section>
+      <label for="ds-name">数据集名称（可选，留空自动生成）</label>
+      <input id="ds-name" bind:value={dsName} placeholder="例如：沪深300 2019-2024 前复权" />
+    </section>
+
+    <details>
+      <summary>附加原始字段（可选）</summary>
+      <p class="hint">OHLCV 必需字段由引擎要求固定获取；附加字段保持原始口径，未请求的字段不会返回。</p>
+      <ul class="field-list">
+        {#each rawFieldChoices as f (f.code)}
+          <li>
+            <label class="check">
+              <input type="checkbox" checked={chosenRaw.includes(f.code)} onchange={() => toggleRawField(f.code)} />
+              {f.label} <span class="hint">（未请求不返回）</span>
+            </label>
+          </li>
+        {/each}
+      </ul>
+      {#if caps.fields.some((f) => !f.raw)}
+        <p class="hint">必需字段：{caps.fields.filter((f) => !f.raw).map((f) => f.label).join(' / ')}</p>
+      {/if}
+    </details>
+
+    {#if formErr.length > 0}
+      <div class="banner error" role="alert">
+        <span aria-hidden="true">⚠</span>
+        <ul class="err-list">
+          {#each formErr as msg, i (i)}<li>{msg}</li>{/each}
+        </ul>
+      </div>
+    {/if}
+    {#if submitErr}
+      <div class="banner error" role="alert">
+        <span aria-hidden="true">⚠</span>
+        <span>数据请求提交失败：{submitErr}</span>
+      </div>
+    {/if}
+    <p class="hint formhint">数据请求会进入队列异步获取。配置仅保存你填写的请求，不预填演示数据。</p>
+    <div>
+      <button class="btn primary" disabled={submitting || selected.length === 0} onclick={submit}>
+        {submitting ? '提交中…' : '提交数据请求'}
+      </button>
+    </div>
+  {/if}
+
+  <Status busy={false} error={null} empty={formOk} />
+</div>
+
+<style>
+  .manual { padding: 0.8rem; margin: 0.4rem 0; }
+  .manual input, .manual select { margin-top: 0.25rem; }
+  .chip-list { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 0.4rem; }
+  .chip-list li {
+    display: inline-flex;
+    align-items: center;
+    gap: 0.4rem;
+    border: 1px solid var(--border-strong);
+    padding: 0.25rem 0.5rem;
+    border-radius: 999px;
+    background: var(--surface-2);
+  }
+  .field-list { list-style: none; padding: 0; margin: 0.3rem 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 0.2rem; }
+  .check { font-size: 0.88rem; margin: 0; display: flex; gap: 0.35rem; align-items: center; }
+  .step-h { font-size: 0.95rem; }
+  .err-list { padding-left: 1.1rem; margin: 0; list-style: disc; }
+  .wrap-3 { align-items: start; }
+</style>
diff --git a/frontend/src/components/DiffView.svelte b/frontend/src/components/DiffView.svelte
new file mode 100644
index 0000000..cf0c1be
--- /dev/null
+++ b/frontend/src/components/DiffView.svelte
@@ -0,0 +1,71 @@
+<script lang="ts">
+  import { diffLines } from 'diff';
+
+  interface Props {
+    before: string;
+    after: string;
+    beforeLabel?: string;
+    afterLabel?: string;
+    maxHeight?: number;
+  }
+  let { before, after, beforeLabel = '原版本', afterLabel = '新版本', maxHeight = 480 }: Props = $props();
+
+  const parts = $derived(diffLines(before ?? '', after ?? ''));
+
+  const lines = $derived.by(() => {
+    const out: { t: 'a' | 'd' | 'c'; text: string }[] = [];
+    for (const p of parts) {
+      const pieces = p.value.replace(/\n$/, '').split('\n');
+      for (const piece of pieces) {
+        if (p.added) out.push({ t: 'a', text: piece });
+        else if (p.removed) out.push({ t: 'd', text: piece });
+        else out.push({ t: 'c', text: piece });
+      }
+    }
+    return out;
+  });
+</script>
+
+<div class="diff">
+  <div class="legend">
+    <span><i class="sw a"></i>新增（{afterLabel}）</span>
+    <span><i class="sw d"></i>删除（{beforeLabel}）</span>
+  </div>
+  <!-- svelte-ignore a11y_no_noninteractive_tabindex -->
+		<div class="body" style="max-height:{maxHeight}px" tabindex="0" aria-label="代码差异" role="region">
+    {#each lines as l, i (i)}
+      {#if l.t === 'a'}
+        <span class="ln add" aria-hidden="true"></span><span class="code add">+{l.text}</span>
+      {:else if l.t === 'd'}
+        <span class="ln del" aria-hidden="true"></span><span class="code del">−{l.text}</span>
+      {:else}
+        <span class="ln" aria-hidden="true"> </span><span class="code">{l.text}</span>
+      {/if}
+    {/each}
+  </div>
+</div>
+
+<style>
+  .diff .legend {
+    color: var(--text-3);
+    font-size: 0.8rem;
+    margin-bottom: 0.4rem;
+    display: flex;
+    gap: 1rem;
+  }
+  .sw { display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 4px; }
+  .sw.a { background: #c7f0e6; }
+  .sw.d { background: #fbd4d0; }
+  .body {
+    overflow: auto;
+    background: var(--surface);
+    border: 1px solid var(--border);
+    border-radius: var(--radius);
+    padding: 0.5rem 0.7rem;
+  }
+  .body .code { font-family: var(--mono); font-size: 12.5px; white-space: pre-wrap; word-break: break-all; display: inline-block; width: 100%; }
+  .add { background: #eafaf5; color: #14532d; }
+  .del { background: #fdf0ee; color: #7f1d1d; }
+  .ln { user-select: none; }
+  .code.add::before, .code.del::before { opacity: 0.6; }
+</style>
diff --git a/frontend/src/components/Layout.svelte b/frontend/src/components/Layout.svelte
new file mode 100644
index 0000000..78cee45
--- /dev/null
+++ b/frontend/src/components/Layout.svelte
@@ -0,0 +1,241 @@
+<script lang="ts">
+  import type { Route } from '../lib/router';
+  import { go } from '../lib/router';
+  import { session } from '../lib/session.svelte';
+  import { postLogout } from '../lib/client';
+  import { projectOf, projectInvisible, projectsStore } from '../lib/listsStore.svelte';
+
+  interface Props {
+    route: Route;
+    children?: import('svelte').Snippet;
+  }
+  let { route, children }: Props = $props();
+
+  const topLeft: { name: string; label: string }[] = [
+    { name: 'projects', label: '我的项目' },
+    { name: 'datasets', label: '数据集' },
+    { name: 'runs', label: '实验记录' },
+    { name: 'usage', label: 'AI 用量' }
+  ];
+
+  const bottom: { name: string; label: string }[] =
+    session.me?.role === 'admin'
+      ? [
+          { name: 'account', label: '账户与安全' },
+          { name: 'admin', label: '管理员' }
+        ]
+      : [{ name: 'account', label: '账户与安全' }];
+
+  async function logout() {
+    await postLogout().catch(() => undefined);
+    session.set(null);
+    // drop cached projects/failure marks: the next session on this browser
+    // must not see (or be marked invisible by) the previous user's projects
+    projectsStore.clear();
+    go('/login');
+  }
+
+  const isProject = $derived(route.name.startsWith('project-'));
+  const projectTab = $derived(isProject ? route.name.replace('project-', '') : '');
+  const projectNav: [string, string][] = [
+    ['data', '数据'],
+    ['strategy', '策略'],
+    ['backtest', '回测'],
+    ['results', '结果']
+  ];
+  const activeProject = $derived(isProject ? projectOf(route.params.id) : null);
+  const projectHidden =
+    $derived(isProject && !activeProject && projectInvisible(route.params.id));
+  // Deep link / first navigation into a project tab: the sidebar store may not
+  // contain the project yet (ProjectsPage was never visited). Fetch it once so
+  // the 当前项目 name resolves without waiting for the tab's own lifecycle.
+  $effect(() => {
+    const id = isProject ? route.params.id : null;
+    if (id && !activeProject) void projectsStore.ensure(id).catch(() => undefined);
+  });
+</script>
+
+<div class="layout">
+  <aside class="sidebar" aria-label="全局导航">
+    <a href="#/projects" class="brand">
+      <span class="brand-mark" aria-hidden="true"></span>
+      <span class="brand-text">策研 <span class="brand-sub">Strategy Lab</span></span>
+    </a>
+
+    {#if isProject}
+      <div class="projctx">
+        <div class="nav-title">当前项目</div>
+        <div class="projname">{activeProject?.name ?? (projectHidden ? '不可见项目' : '加载中…')}</div>
+        {#each projectNav as [t, label] (t)}
+          <a
+            class="navlink"
+            href={`#/projects/${route.params.id}/${t}`}
+            aria-current={projectTab === t ? 'page' : undefined}
+          >{label}</a>
+        {/each}
+        <div class="divider" aria-hidden="true"></div>
+      </div>
+    {/if}
+
+    <div class="nav-title">工作台</div>
+    {#each topLeft as item (item.name)}
+      <a class="navlink" href={`#/${item.name}`} aria-current={route.name === item.name ? 'page' : undefined}>
+        {item.label}
+      </a>
+    {/each}
+
+    <div class="push"></div>
+    <div class="nav-title">账户</div>
+    {#each bottom as item (item.name)}
+      <a class="navlink" href={`#/${item.name}`} aria-current={route.name === item.name ? 'page' : undefined}>
+        {item.label}
+      </a>
+    {/each}
+    {#if session.me}
+      <div class="me">
+        <span class="me-name">{session.me.name}{session.me.role === 'admin' ? ' · 管理员' : ''}</span>
+        <button class="btn small ghost" onclick={() => logout()}>退出</button>
+      </div>
+    {/if}
+  </aside>
+
+  <main class="content" aria-label="主内容">
+    {@render children?.()}
+  </main>
+</div>
+
+<style>
+  .layout {
+    display: grid;
+    grid-template-columns: 240px 1fr;
+    min-height: 100vh;
+  }
+  .sidebar {
+    background: var(--surface);
+    border-right: 1px solid var(--border);
+    padding: 1rem 0.9rem;
+    display: flex;
+    flex-direction: column;
+    gap: 0.65rem;
+    position: sticky;
+    top: 0;
+    height: 100vh;
+    overflow-y: auto;
+  }
+  .brand {
+    display: flex;
+    align-items: center;
+    gap: 0.6rem;
+    padding: 0.3rem 0.4rem 0.6rem;
+    border-bottom: 1px solid var(--border);
+    margin-bottom: 0.4rem;
+    color: var(--text);
+  }
+  .brand:hover { text-decoration: none; }
+  .brand-mark {
+    width: 26px;
+    height: 26px;
+    border-radius: 7px;
+    background: var(--teal-strong);
+    flex-shrink: 0;
+    position: relative;
+    overflow: hidden;
+  }
+  .brand-mark::after {
+    content: '';
+    position: absolute;
+    inset: 5px;
+    background: linear-gradient(
+      to top,
+      transparent 4px,
+      #f0fdfa 4px,
+      #f0fdfa 8px,
+      transparent 8px,
+      transparent 13px,
+      #f0fdfa 13px,
+      #f0fdfa 19px,
+      transparent 19px
+    ) left/ 4px 100% no-repeat;
+    opacity: 0.85;
+  }
+  .brand-text { font-weight: 700; font-size: 1.02rem; letter-spacing: 0.02em; }
+  .brand-sub { color: var(--text-3); font-weight: 500; font-size: 0.72rem; display: block; }
+  .nav-title {
+    font-size: 0.72rem;
+    text-transform: uppercase;
+    letter-spacing: 0.08em;
+    color: var(--text-3);
+    padding: 0.4rem 0.5rem 0.1rem;
+    font-weight: 700;
+  }
+  .navlink {
+    display: block;
+    padding: 0.4rem 0.6rem;
+    border-radius: 8px;
+    color: var(--text-2);
+    font-size: 0.92rem;
+  }
+  .navlink:hover { background: var(--surface-2); text-decoration: none; }
+  .navlink[aria-current='page'] {
+    background: var(--teal-soft);
+    color: var(--teal-strong);
+    font-weight: 600;
+  }
+  .projctx .navlink { font-size: 0.88rem; }
+  .projname {
+    font-weight: 600;
+    padding: 0 0.6rem 0.25rem;
+    font-size: 0.94rem;
+  }
+  .divider {
+    height: 1px;
+    background: var(--border);
+    margin: 0.7rem 0.3rem;
+  }
+  .push { flex: 1; min-height: 1rem; }
+  .me {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    gap: 0.4rem;
+    padding: 0.5rem;
+    background: var(--surface-2);
+    border-radius: 8px;
+    font-size: 0.86rem;
+  }
+  .me-name {
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+    color: var(--text-2);
+  }
+  .content {
+    padding: 1.6rem 2.2rem 3rem;
+    max-width: 1200px;
+    width: 100%;
+    /* grid/flex children default to min-content sizing; without min-width:0 a
+       wide table cell propagates min-content into the column and inflates the
+       whole document (375px probe measured 552px). */
+    min-width: 0;
+  }
+  @media (max-width: 900px) {
+    .layout { grid-template-columns: minmax(0, 1fr); }
+    .sidebar {
+      position: static;
+      height: auto;
+      flex-direction: row;
+      flex-wrap: wrap;
+      align-items: center;
+      border-bottom: 1px solid var(--border);
+      border-right: none;
+      gap: 0.3rem;
+      min-width: 0;
+    }
+    .nav-title, .divider, .push { display: none; }
+    .navlink { padding: 0.35rem 0.7rem; }
+    /* the project tab row must wrap, not force one long line */
+    .projctx { display: flex; flex-wrap: wrap; gap: 0.3rem; min-width: 0; }
+    .projname { max-width: 100%; overflow-wrap: anywhere; }
+    .content { padding: 1.1rem 1rem 3rem; max-width: 100%; }
+  }
+</style>
diff --git a/frontend/src/components/Loading.svelte b/frontend/src/components/Loading.svelte
new file mode 100644
index 0000000..6de2ea2
--- /dev/null
+++ b/frontend/src/components/Loading.svelte
@@ -0,0 +1,24 @@
+<div class="loading-page" role="status" aria-live="polite">
+  <span class="spinner" aria-hidden="true"></span>
+  <p>加载中…</p>
+</div>
+
+<style>
+  .loading-page {
+    min-height: 100vh;
+    display: grid;
+    place-items: center;
+    color: var(--text-3);
+  }
+  .spinner {
+    width: 22px;
+    height: 22px;
+    border: 2.5px solid var(--teal);
+    border-top-color: transparent;
+    border-radius: 50%;
+    animation: spin 0.8s linear infinite;
+  }
+  @keyframes spin {
+    to { transform: rotate(360deg); }
+  }
+</style>
diff --git a/frontend/src/components/Modal.svelte b/frontend/src/components/Modal.svelte
new file mode 100644
index 0000000..c9f334c
--- /dev/null
+++ b/frontend/src/components/Modal.svelte
@@ -0,0 +1,63 @@
+<script lang="ts">
+  import type { Snippet } from 'svelte';
+
+  interface Props {
+    title: string;
+    onClose: () => void;
+    wide?: boolean;
+    children?: Snippet;
+  }
+  let { title, onClose, wide = false, children }: Props = $props();
+
+  function onBackdrop(e: MouseEvent) {
+    if (e.target === e.currentTarget) onClose();
+  }
+
+  function onKeydown(e: KeyboardEvent) {
+    if (e.key === 'Escape') onClose();
+  }
+
+  let container: HTMLDivElement;
+  $effect(() => {
+    container?.focus();
+  });
+</script>
+
+<div
+  class="overlay"
+  onclick={onBackdrop}
+  role="presentation"
+  onkeydown={onKeydown}
+  tabindex="-1"
+  bind:this={container}
+>
+  <div class="dialog card" role="dialog" aria-modal="true" aria-label={title}>
+    <div class="spread">
+      <h2>{title}</h2>
+      <button class="btn ghost" onclick={onClose} aria-label="关闭">✕</button>
+    </div>
+    <div class="content">
+      {@render children?.()}
+    </div>
+  </div>
+</div>
+
+<style>
+  .overlay {
+    position: fixed;
+    inset: 0;
+    background: rgba(15, 30, 35, 0.35);
+    display: grid;
+    place-items: center;
+    z-index: 50;
+    padding: 1rem;
+  }
+  .dialog {
+    width: min(760px, 100%);
+    max-height: 88vh;
+    overflow: auto;
+    padding: 1.1rem 1.2rem;
+  }
+
+  .content { margin-top: 0.6rem; }
+</style>
diff --git a/frontend/src/components/Page.svelte b/frontend/src/components/Page.svelte
new file mode 100644
index 0000000..a9549bb
--- /dev/null
+++ b/frontend/src/components/Page.svelte
@@ -0,0 +1,37 @@
+<script lang="ts">
+  import type { Snippet } from 'svelte';
+
+  interface Props {
+    title: string;
+    subtitle?: string;
+    actions?: Snippet;
+    children?: Snippet;
+    wide?: boolean;
+  }
+  let { title, subtitle, actions, children, wide }: Props = $props();
+</script>
+
+<header class="page-head">
+  <div>
+    <h1>{title}</h1>
+    {#if subtitle}<p class="hint">{subtitle}</p>{/if}
+  </div>
+  {#if actions}{@render actions?.()}{/if}
+</header>
+<div class="page-body" class:wide>
+  {@render children?.()}
+</div>
+
+<style>
+  .page-head {
+    display: flex;
+    justify-content: space-between;
+    align-items: flex-start;
+    gap: 1rem;
+    margin-bottom: 1.1rem;
+    flex-wrap: wrap;
+  }
+  .page-head .hint { margin-top: 0.2rem; }
+  .page-body { max-width: 780px; }
+  .page-body.wide { max-width: none; }
+</style>
diff --git a/frontend/src/components/Status.svelte b/frontend/src/components/Status.svelte
new file mode 100644
index 0000000..019c224
--- /dev/null
+++ b/frontend/src/components/Status.svelte
@@ -0,0 +1,66 @@
+<script lang="ts">
+  interface Props {
+    error?: string | null;
+    busy?: boolean;
+    busyText?: string;
+    empty?: string | boolean | null;
+    emptyHint?: string;
+    warnings?: string[];
+  }
+  let { error, busy, busyText = '加载中…', empty, emptyHint, warnings }: Props = $props();
+</script>
+
+{#if busy}
+  <div class="status" role="status">
+    <span class="spinner" aria-hidden="true"></span>
+    {busyText}
+  </div>
+{:else if error}
+  <div class="banner error" role="alert">
+    <span aria-hidden="true">⚠</span>
+    <span>{error}</span>
+  </div>
+{:else if empty !== null && empty !== undefined && empty !== false}
+  <div class="state empty">
+    <p class="empty-title">{empty}</p>
+    {#if emptyHint}<p class="hint">{emptyHint}</p>{/if}
+  </div>
+{/if}
+{#if warnings && warnings.length > 0}
+  <div class="stack">
+    {#each warnings as w, i (i)}
+      <div class="banner warn"><span aria-hidden="true">△</span><span>{w}</span></div>
+    {/each}
+  </div>
+{/if}
+
+<style>
+  .status {
+    color: var(--text-3);
+    display: flex;
+    align-items: center;
+    gap: 0.5rem;
+    padding: 0.9rem 0;
+    font-size: 0.9rem;
+  }
+  .spinner {
+    width: 15px;
+    height: 15px;
+    border: 2px solid var(--teal);
+    border-top-color: transparent;
+    border-radius: 50%;
+    animation: spin 0.8s linear infinite;
+  }
+  @keyframes spin {
+    to { transform: rotate(360deg); }
+  }
+  .empty {
+    text-align: center;
+    padding: 2.2rem 1rem;
+    border: 1px dashed var(--border-strong);
+    border-radius: var(--radius);
+    color: var(--text-2);
+    background: var(--surface);
+  }
+  .empty-title { font-weight: 600; margin-bottom: 0.2rem; }
+</style>