diff --git a/changelog.d/748-repositories-add-dialog.changed.md b/changelog.d/748-repositories-add-dialog.changed.md
new file mode 100644
index 00000000..d141b5f0
--- /dev/null
+++ b/changelog.d/748-repositories-add-dialog.changed.md
@@ -0,0 +1 @@
+The dashboard's Repositories card now uses the full content row; Add repository is a header button that opens a native dialog with the GitHub App and fine-grained token options. `#add-repo` remains a working deep link, and the form still renders inline when JavaScript is unavailable.
diff --git a/docs/architecture.md b/docs/architecture.md
index c681b10c..20510d84 100644
--- a/docs/architecture.md
+++ b/docs/architecture.md
@@ -86,6 +86,14 @@ header, not a section — so at the top of that page nothing has passed and
 `#release`, the first chip, is marked. That fallback is the accepted state, not a
 defect.
 
+The dashboard's Repositories card owns the full content row; its Add repository
+button sits in the card header and opens a native `<dialog>` with the GitHub App
+and fine-grained token options. `#add-repo` remains the deep link used by the
+empty state, the next action, the setup checklist and the `POST /repos` error, so
+the dialog is opened by the hash as well as the button. The dialog lives outside
+the secondary disclosure; a `<noscript>` rule renders it inline when JavaScript is
+unavailable, and the token form keeps its CSRF field and `type="password"`.
+
 The admin backup card has two read-only sources: `readBackupStatus()` lists the
 plaintext copies in `config.backup.dir` and counts the encrypted copies beside
 them, and `readRestoreDrill()` reads `<dataDir>/backup-drill.json`. The card
diff --git a/public/app.css b/public/app.css
index 8f8454c1..9338c641 100644
--- a/public/app.css
+++ b/public/app.css
@@ -1099,6 +1099,15 @@ a.list-row:hover strong { color: var(--accent); }
 .add-manual { margin-top: 8px; border-top: 1px dashed var(--line); padding-top: 10px; }
 .add-manual summary { cursor: pointer; color: var(--muted-2); font-size: 13px; }
 
+.repos-head { align-items: center; gap: 12px; margin-bottom: 12px; }
+.repos-head h2 { margin: 0; }
+.add-repo-dialog { width: min(680px, calc(100vw - 32px)); max-height: min(80vh, 720px); overflow: auto; border: 1px solid var(--line-strong); border-radius: var(--radius-md); padding: 22px; background: var(--panel); color: var(--text); box-shadow: var(--shadow); }
+.add-repo-dialog::backdrop { background: rgba(0, 0, 0, 0.62); }
+.add-repo-dialog .dialog-head { position: sticky; top: 0; z-index: 1; align-items: center; background: var(--panel); padding-bottom: 8px; }
+.add-repo-dialog .dialog-head h2 { margin: 0; }
+body:has(.add-repo-dialog[open]) { overflow: hidden; }
+@media (max-width: 640px) { .add-repo-dialog { width: calc(100vw - 16px); max-height: calc(100vh - 16px); padding: 16px; } }
+
 .info-tip { display: inline-flex; align-items: center; justify-content: center; width: 15px; height: 15px; margin-left: 4px; padding: 0; border: 1px solid var(--line); border-radius: 50%; background: transparent; color: var(--muted-2); font: inherit; font-size: 12px; line-height: 1; cursor: help; position: relative; vertical-align: middle; }
 .info-tip::after { content: attr(data-tip); position: absolute; left: 0; top: 130%; z-index: 60; width: 270px; max-width: min(270px, calc(100vw - 48px)); padding: 8px 10px; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--surface-raised); color: var(--tip-ink); font-size: 12px; font-weight: 400; line-height: 1.45; white-space: normal; overflow-wrap: anywhere; display: none; opacity: 0; pointer-events: none; transform: translateY(-3px); transition: opacity .12s ease; box-shadow: 0 8px 24px rgba(0, 0, 0, .35); }
 /* Hover and focus are the no-JavaScript fallback only: with no script there is no
diff --git a/public/app.js b/public/app.js
index e2a91c78..3c3ac4e1 100644
--- a/public/app.js
+++ b/public/app.js
@@ -225,6 +225,50 @@
     })
   }
 
+  // Native modal dialogs. The add-repository form moved out of a permanent
+  // half-width card into one; `#add-repo` stays the deep link used by the empty
+  // state, the next action, the setup checklist and the POST /repos error.
+  const openDialog = (dialog) => {
+    if (!(dialog instanceof HTMLDialogElement) || typeof dialog.showModal !== 'function') return false
+    if (!dialog.open) dialog.showModal()
+    return true
+  }
+  const clearDialogHash = (dialog) => {
+    if (location.hash === `#${dialog.id}`) history.replaceState(null, '', `${location.pathname}${location.search}`)
+  }
+  document.querySelectorAll('dialog').forEach((dialog) => {
+    dialog.addEventListener('click', (event) => {
+      if (event.target === dialog) dialog.close()
+    })
+    dialog.addEventListener('close', () => clearDialogHash(dialog))
+  })
+  document.querySelectorAll('[data-open-dialog]').forEach((button) => {
+    button.addEventListener('click', () => {
+      const dialog = document.getElementById(button.getAttribute('data-open-dialog') ?? '')
+      if (dialog === null || !openDialog(dialog)) return
+      if (location.hash !== `#${dialog.id}`) history.replaceState(null, '', `${location.pathname}${location.search}#${dialog.id}`)
+    })
+  })
+  document.querySelectorAll('[data-close-dialog]').forEach((button) => {
+    button.addEventListener('click', () => button.closest('dialog')?.close())
+  })
+  const openHashDialog = () => {
+    if (location.hash.length <= 1) return
+    const dialog = document.getElementById(location.hash.slice(1))
+    if (dialog instanceof HTMLDialogElement) openDialog(dialog)
+  }
+  document.addEventListener('click', (event) => {
+    const link = event.target instanceof Element ? event.target.closest('a[href="#add-repo"]') : null
+    if (link === null) return
+    const dialog = document.getElementById('add-repo')
+    if (dialog === null) return
+    event.preventDefault()
+    openDialog(dialog)
+    if (location.hash !== '#add-repo') history.replaceState(null, '', `${location.pathname}${location.search}#add-repo`)
+  })
+  openHashDialog()
+  window.addEventListener('hashchange', openHashDialog)
+
   document.querySelectorAll('table.table-priority').forEach((table) => {
     if (table.querySelector('[data-priority="low"]') === null) return
     const scroll = table.closest('.table-scroll')
diff --git a/src/views/pages.ts b/src/views/pages.ts
index 254edf17..9f1d3686 100644
--- a/src/views/pages.ts
+++ b/src/views/pages.ts
@@ -1009,7 +1009,7 @@ export function dashboardPage(input: {
   // other two ways in: both target `#jobs`, so a page loaded on page two or with
   // an active filter is a page whose table must be visible.
   const jobTableDeepLinked = jobsPage > 1 || jobFilterIsActive(jobFilter)
-  const secondaryOpen = jobTableDeepLinked || ['#add-repo', '#inbox', '#attention'].includes(nextAction.href)
+  const secondaryOpen = jobTableDeepLinked || reposPage > 1 || ['#repositories', '#add-repo', '#inbox', '#attention'].includes(nextAction.href)
   const repoRows = repos.length === 0
     ? stateCell(5, { kind: 'empty', title: t('还没有仓库。', 'No repositories yet.'), body: t('添加第一个仓库并选择你的角色，任务才会开始。', 'Add your first repository and choose your role before any job can start.'), action: { href: '#add-repo', label: t('添加仓库', 'Add repository') } })
     : repos
@@ -1040,6 +1040,27 @@ export function dashboardPage(input: {
         <p class="fine">${escapeHtml(t('添加后请选择你的角色；未选择前不会启动任务。', 'Choose your role after adding; jobs stay paused until you do.'))}</p>
         <button class="btn" type="submit">${escapeHtml(t('添加仓库', 'Add repository'))}</button>
       </form>`
+  const addRepoOptions = config.githubApp.id === ''
+    ? `<p class="fine">${escapeHtml(t('GitHub App 未配置，请使用下面的 fine-grained token。', 'The GitHub App is not configured; use the fine-grained token below.'))}</p>${manualForm}`
+    : `<div class="add-choice"><h3>${escapeHtml(t('方式一（推荐）：GitHub App', 'Option 1 (recommended): GitHub App'))}</h3><p class="muted">${escapeHtml(t('安装 App 并选择仓库，不需要创建 PAT；Fledge 使用短时 installation token。', 'Install the App and choose repositories; no PAT is needed. Fledge uses short-lived installation tokens.'))}</p><p><a class="btn" href="/auth/github/app/install">${escapeHtml(t('通过 GitHub App 接入', 'Connect with GitHub App'))}</a> <a class="link" href="/repos/new">${escapeHtml(t('选择已安装的仓库', 'Choose installed repositories'))}</a></p></div><details class="add-manual"><summary>${escapeHtml(t('方式二：手动提供 fine-grained token', 'Option 2: provide a fine-grained token manually'))}</summary>${manualForm}</details>`
+  // The add flow is a modal rather than a permanent half-width card, so the
+  // repository table owns the row. `#add-repo` stays on the dialog: the empty
+  // state, next action, setup checklist and POST /repos error all link to it.
+  const addRepoDialog = `<dialog id="add-repo" class="add-repo-dialog" aria-labelledby="add-repo-title">
+    <div class="row between dialog-head">
+      <h2 id="add-repo-title">${escapeHtml(t('添加仓库', 'Add repository'))}</h2>
+      <button class="link" type="button" data-close-dialog>${escapeHtml(t('关闭', 'Close'))}</button>
+    </div>
+    ${error === undefined || error === '' ? '' : `<div class="banner bad" role="alert">${escapeHtml(error)}</div>`}
+    ${addRepoOptions}
+    <p class="fine">${escapeHtml(t('两种方式选一种即可；GitHub App 不需要 PAT。', 'Choose one of the two options; the GitHub App does not need a PAT.'))}</p>
+  </dialog>
+  <noscript><style>
+    #add-repo { display:block; position:static; width:auto; max-width:none; max-height:none; margin:16px 0; padding:0; border:0; background:none; box-shadow:none; }
+    #add-repo::backdrop { display:none; }
+    #add-repo .dialog-head .link { display:none; }
+    [data-open-dialog="add-repo"] { display:none; }
+  </style></noscript>`
   const body = `<section class="workspace-hero">
     <div class="workspace-intro">
       <div class="eyebrow">${escapeHtml(t('仓库', 'REPOSITORIES'))}</div>
@@ -1097,17 +1118,13 @@ export function dashboardPage(input: {
     </div>
   </section>
 
-  <section class="cols">
-    <div class="card">
+  <section class="card" id="repositories">
+    <div class="row between repos-head">
       <h2>${escapeHtml(t('仓库', 'Repositories'))}</h2>
-      <div class="table-scroll"><table class="table-cards"><thead><tr><th>${escapeHtml(t('仓库', 'Repository'))}</th><th>${escapeHtml(t('模式', 'Mode'))}</th><th>${escapeHtml(t('状态', 'Status'))}</th><th>${escapeHtml(t('上次运行', 'Last run'))}</th><th></th></tr></thead><tbody>${repoRows}</tbody></table></div>
-      ${pager('/dashboard', 'reposPage', reposPage, reposTotal, 10, t, { ...dashboardStateParams(jobFilter, windowDays), jobsPage }, '#add-repo')}
-    </div>
-    <div class="card" id="add-repo">
-      <h2>${escapeHtml(t('添加仓库', 'Add repository'))}</h2>
-      ${config.githubApp.id === '' ? `<p class="fine">${escapeHtml(t('GitHub App 未配置，请使用下面的 fine-grained token。', 'The GitHub App is not configured; use the fine-grained token below.'))}</p>${manualForm}` : `<div class="add-choice"><h3>${escapeHtml(t('方式一（推荐）：GitHub App', 'Option 1 (recommended): GitHub App'))}</h3><p class="muted">${escapeHtml(t('安装 App 并选择仓库，不需要创建 PAT；Fledge 使用短时 installation token。', 'Install the App and choose repositories; no PAT is needed. Fledge uses short-lived installation tokens.'))}</p><p><a class="btn" href="/auth/github/app/install">${escapeHtml(t('通过 GitHub App 接入', 'Connect with GitHub App'))}</a> <a class="link" href="/repos/new">${escapeHtml(t('选择已安装的仓库', 'Choose installed repositories'))}</a></p></div><details class="add-manual"><summary>${escapeHtml(t('方式二：手动提供 fine-grained token', 'Option 2: provide a fine-grained token manually'))}</summary>${manualForm}</details>`}
-      <p class="fine">${escapeHtml(t('两种方式选一种即可；GitHub App 不需要 PAT。', 'Choose one of the two options; the GitHub App does not need a PAT.'))}</p>
+      <button class="btn" type="button" data-open-dialog="add-repo" aria-haspopup="dialog" aria-controls="add-repo">${escapeHtml(t('添加仓库', 'Add repository'))}</button>
     </div>
+    <div class="table-scroll"><table class="table-cards"><thead><tr><th>${escapeHtml(t('仓库', 'Repository'))}</th><th>${escapeHtml(t('模式', 'Mode'))}</th><th>${escapeHtml(t('状态', 'Status'))}</th><th>${escapeHtml(t('上次运行', 'Last run'))}</th><th></th></tr></thead><tbody>${repoRows}</tbody></table></div>
+    ${pager('/dashboard', 'reposPage', reposPage, reposTotal, 10, t, { ...dashboardStateParams(jobFilter, windowDays), jobsPage }, '#repositories')}
   </section>
 
   <section class="card" id="jobs">
@@ -1127,7 +1144,8 @@ export function dashboardPage(input: {
     ${pager('/dashboard', 'jobsPage', jobsPage, jobsTotal, 10, t, { reposPage, ...(windowDays === 30 ? { window: 30 } : {}), ...jobFilterParams(jobFilter) }, '#jobs')}
   </section>
     </div>
-  </details>`
+  </details>
+  ${addRepoDialog}`
   return layout({ title: t('仓库', 'Repositories'), viewer, body, config, locale, path: '/dashboard', active: 'dashboard', notice, error })
 }
 
diff --git a/test/jobFilters.test.ts b/test/jobFilters.test.ts
index 17aa5738..2874d52d 100644
--- a/test/jobFilters.test.ts
+++ b/test/jobFilters.test.ts
@@ -282,7 +282,7 @@ test('every dashboard control keeps the state it is not changing', async () => {
       assert.equal(link.params.get('status'), 'failed', 'paging keeps the status filter')
       assert.equal(link.params.get('kind'), 'iterate', 'paging keeps the kind filter')
     }
-    assert.equal(pagers.filter((link) => link.hash === '#add-repo').length, 1, 'the repository table has its pager')
+    assert.equal(pagers.filter((link) => link.hash === '#repositories').length, 1, 'the repository table has its pager')
     assert.equal(pagers.filter((link) => link.hash === '#jobs').length, 1, 'the job table has its pager')
 
     // The "Clear filters" link on a filtered list must still drop the filter and
diff --git a/test/nextAction.test.ts b/test/nextAction.test.ts
index 1ca7e979..3d50abdd 100644
--- a/test/nextAction.test.ts
+++ b/test/nextAction.test.ts
@@ -247,9 +247,11 @@ test('secondary sections collapse into one disclosure and lose nothing', () => {
   assert.notEqual(disclosure, '', 'the secondary sections have one disclosure')
   assert.doesNotMatch(disclosure, /\bopen\b/, 'it starts collapsed so the first screen keeps one action')
   assert.ok(html.indexOf('data-secondary') > html.indexOf('data-next-action'), 'it sits below the next action')
-  for (const marker of ['id="quota"', 'id="delivery"', 'id="jobs"', 'id="add-repo"']) {
+  for (const marker of ['id="quota"', 'id="delivery"', 'id="jobs"']) {
     assert.ok(html.indexOf(marker) > html.indexOf('data-secondary'), `${marker} stays inside the disclosure`)
   }
+  assert.match(html, /<dialog[^>]*id="add-repo"/)
+  assert.ok(html.indexOf('id="add-repo"') > html.indexOf('data-secondary'), 'the add dialog sits below the secondary content')
   // The table now carries `class="table-cards"` (#130), so the marker is the
   // element, not the bare tag that carried no attribute.
   assert.match(html, /<table\b/, 'the repository table is still rendered, only collapsed')
diff --git a/test/pages.test.ts b/test/pages.test.ts
index 8c8019ea..9827cf7c 100644
--- a/test/pages.test.ts
+++ b/test/pages.test.ts
@@ -452,6 +452,14 @@ test('dashboard paginates repositories and jobs at ten per page', async () => {
     assert.match(first.body, /方式二：手动提供 fine-grained token/)
     assert.match(first.body, /add-manual/)
     assert.match(first.body, /info-tip/)
+    assert.match(first.body, /<section class="card" id="repositories">/)
+    assert.match(first.body, /data-open-dialog="add-repo"/)
+    assert.match(first.body, /aria-haspopup="dialog"/)
+    assert.match(first.body, /aria-controls="add-repo"/)
+    assert.match(first.body, /<dialog[^>]*id="add-repo"[^>]*aria-labelledby="add-repo-title"/)
+    assert.match(first.body, /data-close-dialog/)
+    assert.doesNotMatch(first.body, /<div class="card" id="add-repo">/)
+    assert.match(first.body, /<noscript><style>/)
     assert.match(first.body, /PR \/ Issue/)
     assert.doesNotMatch(first.body, /onclick=|onsubmit=/)
     assert.doesNotMatch(first.body, /间隔是两次自动迭代之间的最小间隔/)