diff --git a/.gitea/workflows/build-windows-release.yml b/.gitea/workflows/build-windows-release.yml
index dd739e2..03d49b7 100644
--- a/.gitea/workflows/build-windows-release.yml
+++ b/.gitea/workflows/build-windows-release.yml
@@ -12,118 +12,217 @@ permissions:
   contents: write
 
 jobs:
-  build-windows-release:
-    name: Build Windows x64 Release
-    runs-on:
-      - windows
-
-    env:
-      BUILD_TYPE: Release
-      QT_VERSION: '6.7.3'
-      QT_ARCH: win64_msvc2019_64
-      QT_MODULES: qtimageformats
-      DIST_DIR: dist-windows\chengnan
+  cross-build-windows:
+    name: Cross build Windows x86_64 Release
+    # Gitea act_runner 标签为 9950x；该工作流在 Linux Runner 中交叉编译 Windows x86_64 包。
+    runs-on: 9950x
+    container:
+      image: fedora:latest
 
     steps:
+      - name: Configure Fedora TUNA mirror
+        run: |
+          set -euo pipefail
+          sed -e 's|^metalink=|#metalink=|g' \
+              -e 's|^#baseurl=http://download.example/pub/fedora/linux|baseurl=https://mirrors.tuna.tsinghua.edu.cn/fedora|g' \
+              -i /etc/yum.repos.d/fedora*.repo
+          if [ -f /etc/yum.repos.d/fedora-cisco-openh264.repo ]; then
+            sed -i 's|^enabled=1|enabled=0|g' /etc/yum.repos.d/fedora-cisco-openh264.repo
+          fi
+          dnf makecache --refresh -y
+
       - name: Checkout
-        uses: actions/checkout@v4
-
-      - name: Setup MSVC developer command prompt
-        uses: ilammy/msvc-dev-cmd@v1
-        with:
-          arch: x64
-
-      - name: Setup Python
-        uses: actions/setup-python@v5
-        with:
-          python-version: '3.x'
-
-      - name: Install Qt with aqtinstall
-        shell: powershell
         run: |
-          $ErrorActionPreference = 'Stop'
-          python -m pip install --upgrade pip
-          python -m pip install aqtinstall
-          python -m aqt install-qt windows desktop $env:QT_VERSION win64_msvc2019_64 --outputdir C:\Qt --modules $env:QT_MODULES
-          $qtPrefix = "C:\Qt\$env:QT_VERSION\msvc2019_64"
-          if (-not (Test-Path "$qtPrefix\bin\windeployqt.exe")) {
-            throw "Qt 安装不完整，找不到 windeployqt：$qtPrefix\bin\windeployqt.exe"
-          }
-          "QT_PREFIX=$qtPrefix" | Out-File -FilePath $env:GITHUB_ENV -Append -Encoding utf8
+          set -euo pipefail
+          dnf install -y git rsync
+          WORKDIR="$(pwd)"
+          SRC_DIR="$(mktemp -d /tmp/chengnan-source.XXXXXX)"
+          REPO_URL="${GITHUB_SERVER_URL:-https://git.luochen570.cn}/${GITHUB_REPOSITORY}.git"
+          if [ -n "${GITHUB_TOKEN:-}" ]; then
+            git -c http.extraHeader="Authorization: token ${GITHUB_TOKEN}" \
+              clone --depth 1 --branch "${GITHUB_REF_NAME:-main}" "$REPO_URL" "$SRC_DIR"
+          else
+            git clone --depth 1 --branch "${GITHUB_REF_NAME:-main}" "$REPO_URL" "$SRC_DIR"
+          fi
+          rsync -a --delete "$SRC_DIR/" "$WORKDIR/"
+          rm -rf "$SRC_DIR"
 
-      - name: Configure and build
-        shell: powershell
+      - name: Install cross build dependencies
         run: |
-          $ErrorActionPreference = 'Stop'
-          powershell -ExecutionPolicy Bypass -File .\build-windows.ps1 -QtPrefix "$env:QT_PREFIX" -Config $env:BUILD_TYPE
+          set -euo pipefail
+          dnf install -y \
+            cmake \
+            curl \
+            ninja-build \
+            p7zip \
+            p7zip-plugins \
+            mingw64-gcc-c++ \
+            mingw64-qt6-qtbase
+
+      - name: Configure
+        run: |
+          set -euo pipefail
+          cmake -S . -B build-windows-cross -G Ninja \
+            -DCMAKE_BUILD_TYPE=Release \
+            -DCMAKE_TOOLCHAIN_FILE=/usr/share/mingw/toolchain-mingw64.cmake
+
+      - name: Build
+        run: |
+          set -euo pipefail
+          cmake --build build-windows-cross --parallel "$(nproc)"
 
       - name: Package
-        shell: powershell
         run: |
-          $ErrorActionPreference = 'Stop'
-          $shortSha = $env:GITHUB_SHA.Substring(0, 10)
-          $version = if ($env:GITHUB_REF_TYPE -eq 'tag') { $env:GITHUB_REF_NAME } else { "build-$shortSha" }
-          $zipName = "chengnan-windows-x64-$version.zip"
-          if (-not (Test-Path $env:DIST_DIR)) {
-            throw "发布目录不存在：$env:DIST_DIR"
-          }
-          Compress-Archive -Path "$env:DIST_DIR\*" -DestinationPath $zipName -Force
-          $hash = (Get-FileHash $zipName -Algorithm SHA256).Hash.ToLowerInvariant()
-          "$hash  $zipName" | Out-File -FilePath "$zipName.sha256" -Encoding ascii
-          "PACKAGE_ZIP=$zipName" | Out-File -FilePath $env:GITHUB_ENV -Append -Encoding utf8
-          "RELEASE_TAG=$version" | Out-File -FilePath $env:GITHUB_ENV -Append -Encoding utf8
-          Write-Host "Package: $zipName"
-          Write-Host "SHA256: $hash"
+          set -euo pipefail
+          APP_NAME="chengnan"
+          PACKAGE_NAME="chengnan-windows-x86_64-cross"
+          PACKAGE_DIR="dist-windows-cross/${PACKAGE_NAME}"
+          EXE="build-windows-cross/${APP_NAME}.exe"
+
+          test -f "$EXE"
+          rm -rf dist-windows-cross
+          mkdir -p "$PACKAGE_DIR"
+          cp "$EXE" "$PACKAGE_DIR/"
+
+          # 递归收集 MinGW 运行时和 Qt 依赖 DLL。
+          for round in 1 2 3; do
+            while IFS= read -r binary; do
+              while IFS= read -r dll; do
+                [ -f "$dll" ] || continue
+                cp -n "$dll" "$PACKAGE_DIR/" || true
+              done < <(x86_64-w64-mingw32-objdump -p "$binary" \
+                | awk '/DLL Name:/ {print $3}' \
+                | while read -r name; do \
+                    find /usr/x86_64-w64-mingw32/sys-root/mingw/bin -iname "$name" -print -quit; \
+                  done)
+            done < <(find "$PACKAGE_DIR" -maxdepth 1 -type f \( -name '*.exe' -o -name '*.dll' \) | sort)
+          done
+
+          # Qt 平台插件是 Windows Qt GUI 程序启动所必需的。
+          QT_PLUGIN_ROOT="/usr/x86_64-w64-mingw32/sys-root/mingw/lib/qt6/plugins"
+          if [ -d "$QT_PLUGIN_ROOT/platforms" ]; then
+            mkdir -p "$PACKAGE_DIR/platforms"
+            cp -n "$QT_PLUGIN_ROOT/platforms"/*.dll "$PACKAGE_DIR/platforms/"
+          fi
+
+          cat > "$PACKAGE_DIR/README.txt" <<'EOF'
+          chengnan Windows x86_64 交叉编译发布包
+
+          运行方式：
+          1. 解压整个目录。
+          2. 双击 chengnan.exe 运行。
+
+          说明：
+          - 本目录由 Linux Runner 使用 MinGW-w64 交叉编译生成。
+          - 请不要只复制 chengnan.exe，需保留同目录 DLL 和 platforms 子目录。
+          EOF
+
+          (cd dist-windows-cross && 7z a -tzip "${PACKAGE_NAME}.zip" "${PACKAGE_NAME}" >/dev/null)
+          (cd dist-windows-cross && sha256sum "${PACKAGE_NAME}.zip" > "${PACKAGE_NAME}.zip.sha256")
+          du -h "dist-windows-cross/${PACKAGE_NAME}.zip"
+
+      - name: Verify package
+        run: |
+          set -euo pipefail
+          test -s dist-windows-cross/chengnan-windows-x86_64-cross.zip
+          test -s dist-windows-cross/chengnan-windows-x86_64-cross.zip.sha256
+          (cd dist-windows-cross && sha256sum -c chengnan-windows-x86_64-cross.zip.sha256)
+          7z l dist-windows-cross/chengnan-windows-x86_64-cross.zip | grep 'chengnan.exe'
+          7z l dist-windows-cross/chengnan-windows-x86_64-cross.zip | grep 'platforms/'
 
       - name: Upload build artifact
         uses: actions/upload-artifact@v3
         with:
-          name: chengnan-windows-x64
+          name: chengnan-windows-x86_64-cross
           path: |
-            ${{ env.PACKAGE_ZIP }}
-            ${{ env.PACKAGE_ZIP }}.sha256
+            dist-windows-cross/chengnan-windows-x86_64-cross.zip
+            dist-windows-cross/chengnan-windows-x86_64-cross.zip.sha256
+          if-no-files-found: error
 
-      - name: Publish to Gitea Release
-        if: ${{ github.event_name != 'pull_request' }}
-        shell: powershell
+      - name: Upload package to repository release
         env:
-          GITEA_TOKEN: ${{ secrets.RELEASE_TOKEN || secrets.GITHUB_TOKEN }}
+          RELEASE_TOKEN: ${{ secrets.RELEASE_TOKEN }}
         run: |
-          $ErrorActionPreference = 'Stop'
-          if ([string]::IsNullOrWhiteSpace($env:GITEA_TOKEN)) {
-            throw '缺少发布 Token。请在仓库 Secrets 中配置 RELEASE_TOKEN，或确保 Gitea 提供 GITHUB_TOKEN。'
+          set -euo pipefail
+          PACKAGE_NAME="chengnan-windows-x86_64-cross"
+          SERVER_URL="${GITHUB_SERVER_URL:-https://git.luochen570.cn}"
+          REPOSITORY="${GITHUB_REPOSITORY}"
+          API_BASE="${SERVER_URL}/api/v1/repos/${REPOSITORY}"
+          TOKEN="${RELEASE_TOKEN:-${GITHUB_TOKEN:-}}"
+          test -n "$TOKEN"
+
+          if [ "${GITHUB_REF_TYPE:-}" = "tag" ]; then
+            TAG_NAME="${GITHUB_REF_NAME}"
+            RELEASE_NAME="${GITHUB_REF_NAME}"
+            PRERELEASE=false
+          else
+            TAG_NAME="build-${GITHUB_SHA:0:10}"
+            RELEASE_NAME="chengnan ${GITHUB_SHA:0:10}"
+            PRERELEASE=true
+          fi
+
+          json_escape() {
+            python3 -c 'import json,sys; print(json.dumps(sys.stdin.read()))'
           }
 
-          $api = $env:GITHUB_API_URL.TrimEnd('/')
-          $repo = $env:GITHUB_REPOSITORY
-          $tag = $env:RELEASE_TAG
-          $zip = $env:PACKAGE_ZIP
-          $headers = @{
-            Authorization = "token $env:GITEA_TOKEN"
-            Accept = 'application/json'
+          release_payload="$(printf '{"tag_name":%s,"target_commitish":%s,"name":%s,"body":%s,"draft":false,"prerelease":%s}' \
+            "$(printf '%s' "$TAG_NAME" | json_escape)" \
+            "$(printf '%s' "${GITHUB_SHA}" | json_escape)" \
+            "$(printf '%s' "$RELEASE_NAME" | json_escape)" \
+            "$(printf 'Automated Windows x86_64 cross build from Gitea Actions.\n' | json_escape)" \
+            "$PRERELEASE")"
+
+          status="$(curl --show-error --silent --location \
+            --header "Authorization: token ${TOKEN}" \
+            --header 'Content-Type: application/json' \
+            --data "$release_payload" \
+            --write-out '%{http_code}' \
+            --output /tmp/gitea-release-response.json \
+            "${API_BASE}/releases")"
+
+          if [ "$status" = "409" ] || [ "$status" = "422" ]; then
+            RELEASE_ID="$(curl --show-error --silent --location \
+              --header "Authorization: token ${TOKEN}" \
+              "${API_BASE}/releases/tags/${TAG_NAME}" \
+              | python3 -c 'import json,sys; print(json.load(sys.stdin)["id"])')"
+          elif [ "$status" = "201" ] || [ "$status" = "200" ]; then
+            RELEASE_ID="$(python3 -c 'import json; print(json.load(open("/tmp/gitea-release-response.json"))["id"])')"
+          else
+            echo "Create release failed with HTTP ${status}" >&2
+            cat /tmp/gitea-release-response.json >&2
+            exit 1
+          fi
+
+          upload_asset() {
+            local src="$1"
+            local name
+            local existing_id
+            local status
+            name="$(basename "$src")"
+            existing_id="$(curl --show-error --silent --location \
+              --header "Authorization: token ${TOKEN}" \
+              "${API_BASE}/releases/${RELEASE_ID}/assets" \
+              | ASSET_NAME="$name" python3 -c 'import json,os,sys; assets=json.load(sys.stdin); print(next((str(a["id"]) for a in assets if a.get("name")==os.environ["ASSET_NAME"]), ""))')"
+            if [ -n "$existing_id" ]; then
+              curl --show-error --silent --location \
+                --request DELETE \
+                --header "Authorization: token ${TOKEN}" \
+                --output /tmp/gitea-release-asset-delete-response.json \
+                "${API_BASE}/releases/${RELEASE_ID}/assets/${existing_id}"
+            fi
+            status="$(curl --show-error --silent --location \
+              --header "Authorization: token ${TOKEN}" \
+              --form "attachment=@${src};filename=${name}" \
+              --write-out '%{http_code}' \
+              --output /tmp/gitea-release-asset-response.json \
+              "${API_BASE}/releases/${RELEASE_ID}/assets?name=${name}")"
+            if [ "$status" != "201" ] && [ "$status" != "200" ]; then
+              echo "Upload release asset failed with HTTP ${status}: ${name}" >&2
+              cat /tmp/gitea-release-asset-response.json >&2
+              exit 1
+            fi
           }
 
-          $releaseUrl = "$api/repos/$repo/releases/tags/$tag"
-          try {
-            $release = Invoke-RestMethod -Method Get -Uri $releaseUrl -Headers $headers
-          } catch {
-            $body = @{
-              tag_name = $tag
-              target_commitish = $env:GITHUB_SHA
-              name = "chengnan $tag"
-              body = "Windows x64 Release 自动构建产物。`n`n提交：$env:GITHUB_SHA"
-              draft = $false
-              prerelease = ($env:GITHUB_REF_TYPE -ne 'tag')
-            } | ConvertTo-Json -Depth 5
-            $release = Invoke-RestMethod -Method Post -Uri "$api/repos/$repo/releases" -Headers $headers -ContentType 'application/json' -Body $body
-          }
-
-          foreach ($asset in @($zip, "$zip.sha256")) {
-            $existing = @($release.assets | Where-Object { $_.name -eq $asset })
-            foreach ($item in $existing) {
-              Invoke-RestMethod -Method Delete -Uri "$api/repos/$repo/releases/assets/$($item.id)" -Headers $headers | Out-Null
-            }
-            $uploadUrl = "$api/repos/$repo/releases/$($release.id)/assets?name=$([uri]::EscapeDataString($asset))"
-            Invoke-RestMethod -Method Post -Uri $uploadUrl -Headers $headers -ContentType 'multipart/form-data' -Form @{ attachment = Get-Item $asset } | Out-Null
-            Write-Host "Uploaded release asset: $asset"
-          }
+          upload_asset "dist-windows-cross/${PACKAGE_NAME}.zip"
+          upload_asset "dist-windows-cross/${PACKAGE_NAME}.zip.sha256"
+          echo "Release assets uploaded to ${SERVER_URL}/${REPOSITORY}/releases/tag/${TAG_NAME}"