diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 2c60154383..1db4a6d199 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -28,10 +28,17 @@ jobs:
         with:
           fetch-depth: 2
 
-      - name: "Setup"
+      - name: Install Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: "3.13"
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v7
+      
+      - name: "Install Python dependencies"
         run: |
-          sudo apt-get update
-          sudo apt-get install -y python3-sphinx
+          uv pip install --system -r doc/requirements.txt
           sphinx-build --version
 
       - name: "Build documentation"
@@ -42,6 +49,7 @@ jobs:
       - name: "Setup LaTeX"
         if: github.repository == 'flintlib/flint' && github.event_name == 'push' && github.ref == 'refs/heads/main'
         run: |
+          sudo apt-get update
           # See https://www.sphinx-doc.org/en/master/usage/builders/index.html#sphinx.builders.latex.LaTeXBuilder
           sudo apt-get install -y texlive-latex-recommended texlive-fonts-recommended texlive-fonts-extra tex-gyre texlive-latex-extra latexmk
 
diff --git a/.gitignore b/.gitignore
index ce3195baac..4bc8073979 100644
--- a/.gitignore
+++ b/.gitignore
@@ -66,3 +66,5 @@ config.m4
 src/flint-mparam.h
 .gdb_history
 vgcore.*
+.venv/
+venv/
\ No newline at end of file
diff --git a/doc/requirements.txt b/doc/requirements.txt
new file mode 100644
index 0000000000..7bb5d13728
--- /dev/null
+++ b/doc/requirements.txt
@@ -0,0 +1,3 @@
+# Sphinx documentation dependencies
+sphinx>=9.0
+sphinx_clarity_theme==1.0.2
\ No newline at end of file
diff --git a/doc/source/_static/default.css b/doc/source/_static/default.css
deleted file mode 100644
index 019ab8d02b..0000000000
--- a/doc/source/_static/default.css
+++ /dev/null
@@ -1,23 +0,0 @@
-@import url("pygments.css");
-@import url("classic.css");
-
-body { font-family: "arial", sans-serif; }
-
-div .toctree-wrapper { column-count: 2; }
-
-div .toctree-wrapper > ul { margin: 0; }
-
-ul .toctree-l1 { 
-    margin: 0;
-    -webkit-column-break-inside: avoid;
-    page-break-inside: avoid;
-    break-inside: avoid-column;
-}
-
-div.body {
-    min-width: 450px;
-    max-width: 100%;
-}
-
-li p { margin: 0.2em; }
-
diff --git a/doc/source/_static/styles/custom.css b/doc/source/_static/styles/custom.css
new file mode 100644
index 0000000000..b99ba99b27
--- /dev/null
+++ b/doc/source/_static/styles/custom.css
@@ -0,0 +1,37 @@
+/* More dense API signatures */
+dt.sig {
+    margin: 0 !important;
+    border: 0 !important;
+    border-bottom: 1px solid var(--color-base-100) !important;
+}
+
+dt {
+    font-weight: normal !important;
+}
+
+/* -- object description styles --------------------------------------------- */
+
+.sig-name {
+    font-weight: bold;
+}
+
+.sig-param.n {
+	font-style: italic;
+}
+
+/* C++ specific styling */
+
+.sig.c   .k, .sig.c   .kt,
+.sig.cpp .k, .sig.cpp .kt {
+	color: #0033B3;
+}
+
+.sig.c   .m,
+.sig.cpp .m {
+	color: #1750EB;
+}
+
+.sig.c   .s, .sig.c   .sc,
+.sig.cpp .s, .sig.cpp .sc {
+	color: #067D17;
+}
diff --git a/doc/source/conf.py b/doc/source/conf.py
index ddad93c724..4efad5172f 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -91,11 +91,7 @@
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
 #
-html_theme = 'default'
-
-html_context = {
-    'css_files': ['_static/default.css'],
-}
+html_theme = 'sphinx_clarity_theme'
 
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
@@ -103,16 +99,6 @@
 #
 
 html_theme_options = {
-    'sidebarwidth' : 300,
-    'collapsiblesidebar': True,
-    'bodyfont': "'arial', sans-serif",
-    'headfont': "'arial', sans-serif",
-    'sidebarbtncolor': '#666',
-    'sidebarbgcolor': '#444',
-    'sidebarlinkcolor': '#ddd',
-    'relbarbgcolor': '#333',
-    'footerbgcolor': '#333',
-    'headbgcolor': '#fff',
 }
 
 # Add any paths that contain custom static files (such as style sheets) here,
@@ -130,6 +116,8 @@
 #
 # html_sidebars = {}
 
+html_css_files = ["styles/custom.css"]
+
 
 # -- Options for HTMLHelp output ---------------------------------------------
 
diff --git a/doc/source/index.rst b/doc/source/index.rst
index bc1afa25a8..a649f645f2 100644
--- a/doc/source/index.rst
+++ b/doc/source/index.rst
@@ -22,6 +22,7 @@ Introduction
 
 .. toctree::
    :maxdepth: 1
+   :caption: Introduction
 
    introduction.rst
    building.rst
@@ -38,6 +39,7 @@ General utilities
 
 .. toctree::
    :maxdepth: 1
+   :caption: General utilities
 
    flint.rst
    profiler.rst
@@ -50,6 +52,7 @@ Generic rings
 
 .. toctree::
    :maxdepth: 1
+   :caption: Generic rings
 
    gr.rst
    gr_implementing.rst
@@ -74,6 +77,7 @@ Integers
 
 .. toctree::
    :maxdepth: 1
+   :caption: Integers
 
    ulong_extras.rst
    fmpz.rst
@@ -109,6 +113,7 @@ Rational numbers
 
 .. toctree::
    :maxdepth: 1
+   :caption: Rational numbers
 
    fmpq.rst
    fmpq_vec.rst
@@ -131,6 +136,7 @@ Integers mod n
 
 .. toctree::
    :maxdepth: 1
+   :caption: Integers mod n
 
    nmod.rst
    nmod_vec.rst
@@ -162,6 +168,7 @@ Groups and other structures
 
 .. toctree::
    :maxdepth: 1
+   :caption: Groups and other structures
 
    perm.rst
    qfb.rst
@@ -174,6 +181,7 @@ Number fields and algebraic numbers
 
 .. toctree::
    :maxdepth: 1
+   :caption: Number fields and algebraic numbers
 
    nf.rst
    nf_elem.rst
@@ -185,6 +193,7 @@ Real and complex numbers
 
 .. toctree::
    :maxdepth: 1
+   :caption: Real and complex numbers
 
    overview.rst
    using.rst
@@ -235,6 +244,7 @@ Exact real and complex numbers
 
 .. toctree::
    :maxdepth: 1
+   :caption: Exact real and complex numbers
 
    introduction_calcium.rst
    examples_calcium.rst
@@ -253,6 +263,7 @@ Finite fields
 
 .. toctree::
    :maxdepth: 1
+   :caption: Finite fields
 
    fq.rst
    fq_default.rst
@@ -292,6 +303,7 @@ p-adic numbers
 
 .. toctree::
    :maxdepth: 1
+   :caption: p-adic numbers
 
    padic.rst
    padic_poly.rst
@@ -303,6 +315,7 @@ Floating-point support code
 
 .. toctree::
    :maxdepth: 1
+   :caption: Floating-point support code
 
    double_extras.rst
    double_interval.rst
@@ -314,6 +327,7 @@ Interfaces
 
 .. toctree::
    :maxdepth: 1
+   :caption: Interfaces
 
    python_flint.rst
 
@@ -322,6 +336,7 @@ References
 
 .. toctree::
    :maxdepth: 1
+   :caption: References
 
    references.rst
 
@@ -330,5 +345,6 @@ Version history
 
 .. toctree::
    :maxdepth: 1
+   :caption: Version history
 
    history.rst