diff --git a/.github/workflows/build-css-inline.yml b/.github/workflows/build-css-inline.yml
new file mode 100644
index 000000000..7df5a9ec7
--- /dev/null
+++ b/.github/workflows/build-css-inline.yml
@@ -0,0 +1,114 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+---
+# This workflow is based on the `linux` job of
+# https://github.com/Stranger6667/css-inline/blob/python-v0.21.2/.github/workflows/python-release.yml
+name: Build css-inline wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'css-inline version to build (git tag without the python-v prefix, e.g. 0.21.2)'
+        required: true
+        default: '0.21.2'
+  pull_request:
+    paths:
+      - '.github/workflows/build-css-inline.yml'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ inputs.version || '0.21.2' }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read  # to fetch code (actions/checkout)
+
+env:
+  # `inputs.version` is empty on pull_request events; default to 0.21.2 there.
+  CSS_INLINE_VERSION: ${{ inputs.version || '0.21.2' }}
+  MANYLINUX_RISCV64_IMAGE: quay.io/pypa/manylinux_2_39_riscv64
+
+jobs:
+  setup:
+    uses: $/.github/workflows/_setup.yml
+
+  build_wheels:
+    needs: [setup]
+    name: Build css-inline ${{ inputs.version || '0.21.2' }} ${{ matrix.tag }}-manylinux_riscv64
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 300
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          # pyo3's abi3-py310 feature is on unconditionally (bindings/python/Cargo.toml),
+          # so one abi3 wheel serves every interpreter it claims. Upstream publishes no
+          # free-threaded (cp314t) wheel at all, so there is no second job here.
+          - tag: cp310-abi3
+            # Built on cp310 -- the oldest interpreter the abi3 tag claims --
+            # and re-tested on the newer ones via find_compatible_wheel.
+            build: >-
+              cp310-manylinux_riscv64 cp311-manylinux_riscv64
+              cp312-manylinux_riscv64 cp313-manylinux_riscv64
+              cp314-manylinux_riscv64
+
+    steps:
+      - name: Checkout css-inline python-v${{ env.CSS_INLINE_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: Stranger6667/css-inline
+          ref: python-v${{ env.CSS_INLINE_VERSION }}
+          persist-credentials: false
+
+      - name: Build wheels
+        uses: pypa/cibuildwheel@1828c10ab37f080699c7b81cea34097c684a7074  # v4.2.0
+        with:
+          package-dir: bindings/python
+          output-dir: wheelhouse/
+        env:
+          # musllinux is dropped: rustup.rs ships no riscv64 musl toolchain.
+          CIBW_BUILD: ${{ matrix.build }}
+          CIBW_MANYLINUX_RISCV64_IMAGE: ${{ env.MANYLINUX_RISCV64_IMAGE }}
+          # bindings/python ships no [tool.cibuildwheel], so the Rust toolchain
+          # its maturin backend needs is installed in-container here.
+          CIBW_BEFORE_ALL_LINUX: >-
+            curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
+          CIBW_ENVIRONMENT_LINUX: PATH="$PATH:$HOME/.cargo/bin"
+          CIBW_TEST_REQUIRES: pytest hypothesis
+          # css-inline/tests carries the background test server and the
+          # fixture that bindings/python/tests-py reaches through a relative
+          # "../../css-inline/tests/..." href, so both trees are staged
+          # together, preserving their layout from the checkout.
+          CIBW_TEST_SOURCES: >-
+            bindings/python/tests-py bindings/python/pyproject.toml
+            css-inline/tests
+          # Upstream's own CI backgrounds this same server ahead of every
+          # Python/Rust/Ruby test job (css-inline/tests/server.py) to serve
+          # tests-py's remote-stylesheet cases from 127.0.0.1:1234.
+          # css_inline/__init__.py is a pure-Python re-export shim; the compiled
+          # extension is the css_inline.css_inline submodule (gotcha 56).
+          CIBW_TEST_COMMAND: >-
+            python css-inline/tests/server.py >/dev/null 2>&1 &
+            for _ in $(seq 1 20); do
+              python -c "import socket; socket.create_connection(('127.0.0.1', 1234), timeout=0.2).close()" 2>/dev/null && break;
+              sleep 0.1;
+            done &&
+            python -c "import css_inline.css_inline as m; assert m.__file__.endswith('.so'), m.__file__" &&
+            cd bindings/python &&
+            python -m pytest -v tests-py
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: css-inline-${{ env.CSS_INLINE_VERSION }}-${{ matrix.tag }}-manylinux_riscv64
+          path: wheelhouse/*.whl
+          if-no-files-found: error
+
+  publish:
+    name: Publish css-inline ${{ inputs.version || '0.21.2' }}
+    needs: [setup, build_wheels]
+    permissions:
+      contents: write
+      pull-requests: write
+    uses: $/.github/workflows/_publish-wheel.yml
+    with:
+      artifact-pattern: css-inline-${{ inputs.version || '0.21.2' }}-*-manylinux_riscv64