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diff --git a/.venv/lib/python3.12/site-packages/pptx/oxml/slide.py b/.venv/lib/python3.12/site-packages/pptx/oxml/slide.py
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+"""Slide-related custom element classes, including those for masters."""
+
+from __future__ import annotations
+
+from typing import TYPE_CHECKING, Callable, cast
+
+from pptx.oxml import parse_from_template, parse_xml
+from pptx.oxml.dml.fill import CT_GradientFillProperties
+from pptx.oxml.ns import nsdecls
+from pptx.oxml.simpletypes import XsdString
+from pptx.oxml.xmlchemy import (
+    BaseOxmlElement,
+    Choice,
+    OneAndOnlyOne,
+    OptionalAttribute,
+    RequiredAttribute,
+    ZeroOrMore,
+    ZeroOrOne,
+    ZeroOrOneChoice,
+)
+
+if TYPE_CHECKING:
+    from pptx.oxml.shapes.groupshape import CT_GroupShape
+
+
+class _BaseSlideElement(BaseOxmlElement):
+    """Base class for the six slide types, providing common methods."""
+
+    cSld: CT_CommonSlideData
+
+    @property
+    def spTree(self) -> CT_GroupShape:
+        """Return required `p:cSld/p:spTree` grandchild."""
+        return self.cSld.spTree
+
+
+class CT_Background(BaseOxmlElement):
+    """`p:bg` element."""
+
+    _insert_bgPr: Callable[[CT_BackgroundProperties], None]
+
+    # ---these two are actually a choice, not a sequence, but simpler for
+    # ---present purposes this way.
+    _tag_seq = ("p:bgPr", "p:bgRef")
+    bgPr: CT_BackgroundProperties | None = ZeroOrOne(  # pyright: ignore[reportAssignmentType]
+        "p:bgPr", successors=()
+    )
+    bgRef = ZeroOrOne("p:bgRef", successors=())
+    del _tag_seq
+
+    def add_noFill_bgPr(self):
+        """Return a new `p:bgPr` element with noFill properties."""
+        xml = "<p:bgPr %s>\n" "  <a:noFill/>\n" "  <a:effectLst/>\n" "</p:bgPr>" % nsdecls("a", "p")
+        bgPr = cast(CT_BackgroundProperties, parse_xml(xml))
+        self._insert_bgPr(bgPr)
+        return bgPr
+
+
+class CT_BackgroundProperties(BaseOxmlElement):
+    """`p:bgPr` element."""
+
+    _tag_seq = (
+        "a:noFill",
+        "a:solidFill",
+        "a:gradFill",
+        "a:blipFill",
+        "a:pattFill",
+        "a:grpFill",
+        "a:effectLst",
+        "a:effectDag",
+        "a:extLst",
+    )
+    eg_fillProperties = ZeroOrOneChoice(
+        (
+            Choice("a:noFill"),
+            Choice("a:solidFill"),
+            Choice("a:gradFill"),
+            Choice("a:blipFill"),
+            Choice("a:pattFill"),
+            Choice("a:grpFill"),
+        ),
+        successors=_tag_seq[6:],
+    )
+    del _tag_seq
+
+    def _new_gradFill(self):
+        """Override default to add default gradient subtree."""
+        return CT_GradientFillProperties.new_gradFill()
+
+
+class CT_CommonSlideData(BaseOxmlElement):
+    """`p:cSld` element."""
+
+    _remove_bg: Callable[[], None]
+    get_or_add_bg: Callable[[], CT_Background]
+
+    _tag_seq = ("p:bg", "p:spTree", "p:custDataLst", "p:controls", "p:extLst")
+    bg: CT_Background | None = ZeroOrOne(  # pyright: ignore[reportAssignmentType]
+        "p:bg", successors=_tag_seq[1:]
+    )
+    spTree: CT_GroupShape = OneAndOnlyOne("p:spTree")  # pyright: ignore[reportAssignmentType]
+    del _tag_seq
+    name: str = OptionalAttribute(  # pyright: ignore[reportAssignmentType]
+        "name", XsdString, default=""
+    )
+
+    def get_or_add_bgPr(self) -> CT_BackgroundProperties:
+        """Return `p:bg/p:bgPr` grandchild.
+
+        If no such grandchild is present, any existing `p:bg` child is first removed and a new
+        default `p:bg` with noFill settings is added.
+        """
+        bg = self.bg
+        if bg is None or bg.bgPr is None:
+            bg = self._change_to_noFill_bg()
+        return cast(CT_BackgroundProperties, bg.bgPr)
+
+    def _change_to_noFill_bg(self) -> CT_Background:
+        """Establish a `p:bg` child with no-fill settings.
+
+        Any existing `p:bg` child is first removed.
+        """
+        self._remove_bg()
+        bg = self.get_or_add_bg()
+        bg.add_noFill_bgPr()
+        return bg
+
+
+class CT_NotesMaster(_BaseSlideElement):
+    """`p:notesMaster` element, root of a notes master part."""
+
+    _tag_seq = ("p:cSld", "p:clrMap", "p:hf", "p:notesStyle", "p:extLst")
+    cSld: CT_CommonSlideData = OneAndOnlyOne("p:cSld")  # pyright: ignore[reportAssignmentType]
+    del _tag_seq
+
+    @classmethod
+    def new_default(cls) -> CT_NotesMaster:
+        """Return a new `p:notesMaster` element based on the built-in default template."""
+        return cast(CT_NotesMaster, parse_from_template("notesMaster"))
+
+
+class CT_NotesSlide(_BaseSlideElement):
+    """`p:notes` element, root of a notes slide part."""
+
+    _tag_seq = ("p:cSld", "p:clrMapOvr", "p:extLst")
+    cSld: CT_CommonSlideData = OneAndOnlyOne("p:cSld")  # pyright: ignore[reportAssignmentType]
+    del _tag_seq
+
+    @classmethod
+    def new(cls) -> CT_NotesSlide:
+        """Return a new ``<p:notes>`` element based on the default template.
+
+        Note that the template does not include placeholders, which must be subsequently cloned
+        from the notes master.
+        """
+        return cast(CT_NotesSlide, parse_from_template("notes"))
+
+
+class CT_Slide(_BaseSlideElement):
+    """`p:sld` element, root element of a slide part (XML document)."""
+
+    _tag_seq = ("p:cSld", "p:clrMapOvr", "p:transition", "p:timing", "p:extLst")
+    cSld: CT_CommonSlideData = OneAndOnlyOne("p:cSld")  # pyright: ignore[reportAssignmentType]
+    clrMapOvr = ZeroOrOne("p:clrMapOvr", successors=_tag_seq[2:])
+    timing = ZeroOrOne("p:timing", successors=_tag_seq[4:])
+    del _tag_seq
+
+    @classmethod
+    def new(cls) -> CT_Slide:
+        """Return new `p:sld` element configured as base slide shape."""
+        return cast(CT_Slide, parse_xml(cls._sld_xml()))
+
+    @property
+    def bg(self):
+        """Return `p:bg` grandchild or None if not present."""
+        return self.cSld.bg
+
+    def get_or_add_childTnLst(self):
+        """Return parent element for a new `p:video` child element.
+
+        The `p:video` element causes play controls to appear under a video
+        shape (pic shape containing video). There can be more than one video
+        shape on a slide, which causes the precondition to vary. It needs to
+        handle the case when there is no `p:sld/p:timing` element and when
+        that element already exists. If the case isn't simple, it just nukes
+        what's there and adds a fresh one. This could theoretically remove
+        desired existing timing information, but there isn't any evidence
+        available to me one way or the other, so I've taken the simple
+        approach.
+        """
+        childTnLst = self._childTnLst
+        if childTnLst is None:
+            childTnLst = self._add_childTnLst()
+        return childTnLst
+
+    def _add_childTnLst(self):
+        """Add `./p:timing/p:tnLst/p:par/p:cTn/p:childTnLst` descendant.
+
+        Any existing `p:timing` child element is ruthlessly removed and
+        replaced.
+        """
+        self.remove(self.get_or_add_timing())
+        timing = parse_xml(self._childTnLst_timing_xml())
+        self._insert_timing(timing)
+        return timing.xpath("./p:tnLst/p:par/p:cTn/p:childTnLst")[0]
+
+    @property
+    def _childTnLst(self):
+        """Return `./p:timing/p:tnLst/p:par/p:cTn/p:childTnLst` descendant.
+
+        Return None if that element is not present.
+        """
+        childTnLsts = self.xpath("./p:timing/p:tnLst/p:par/p:cTn/p:childTnLst")
+        if not childTnLsts:
+            return None
+        return childTnLsts[0]
+
+    @staticmethod
+    def _childTnLst_timing_xml():
+        return (
+            "<p:timing %s>\n"
+            "  <p:tnLst>\n"
+            "    <p:par>\n"
+            '      <p:cTn id="1" dur="indefinite" restart="never" nodeType="'
+            'tmRoot">\n'
+            "        <p:childTnLst/>\n"
+            "      </p:cTn>\n"
+            "    </p:par>\n"
+            "  </p:tnLst>\n"
+            "</p:timing>" % nsdecls("p")
+        )
+
+    @staticmethod
+    def _sld_xml():
+        return (
+            "<p:sld %s>\n"
+            "  <p:cSld>\n"
+            "    <p:spTree>\n"
+            "      <p:nvGrpSpPr>\n"
+            '        <p:cNvPr id="1" name=""/>\n'
+            "        <p:cNvGrpSpPr/>\n"
+            "        <p:nvPr/>\n"
+            "      </p:nvGrpSpPr>\n"
+            "      <p:grpSpPr/>\n"
+            "    </p:spTree>\n"
+            "  </p:cSld>\n"
+            "  <p:clrMapOvr>\n"
+            "    <a:masterClrMapping/>\n"
+            "  </p:clrMapOvr>\n"
+            "</p:sld>" % nsdecls("a", "p", "r")
+        )
+
+
+class CT_SlideLayout(_BaseSlideElement):
+    """`p:sldLayout` element, root of a slide layout part."""
+
+    _tag_seq = ("p:cSld", "p:clrMapOvr", "p:transition", "p:timing", "p:hf", "p:extLst")
+    cSld: CT_CommonSlideData = OneAndOnlyOne("p:cSld")  # pyright: ignore[reportAssignmentType]
+    del _tag_seq
+
+
+class CT_SlideLayoutIdList(BaseOxmlElement):
+    """`p:sldLayoutIdLst` element, child of `p:sldMaster`.
+
+    Contains references to the slide layouts that inherit from the slide master.
+    """
+
+    sldLayoutId_lst: list[CT_SlideLayoutIdListEntry]
+
+    sldLayoutId = ZeroOrMore("p:sldLayoutId")
+
+
+class CT_SlideLayoutIdListEntry(BaseOxmlElement):
+    """`p:sldLayoutId` element, child of `p:sldLayoutIdLst`.
+
+    Contains a reference to a slide layout.
+    """
+
+    rId: str = RequiredAttribute("r:id", XsdString)  # pyright: ignore[reportAssignmentType]
+
+
+class CT_SlideMaster(_BaseSlideElement):
+    """`p:sldMaster` element, root of a slide master part."""
+
+    get_or_add_sldLayoutIdLst: Callable[[], CT_SlideLayoutIdList]
+
+    _tag_seq = (
+        "p:cSld",
+        "p:clrMap",
+        "p:sldLayoutIdLst",
+        "p:transition",
+        "p:timing",
+        "p:hf",
+        "p:txStyles",
+        "p:extLst",
+    )
+    cSld: CT_CommonSlideData = OneAndOnlyOne("p:cSld")  # pyright: ignore[reportAssignmentType]
+    sldLayoutIdLst: CT_SlideLayoutIdList = ZeroOrOne(  # pyright: ignore[reportAssignmentType]
+        "p:sldLayoutIdLst", successors=_tag_seq[3:]
+    )
+    del _tag_seq
+
+
+class CT_SlideTiming(BaseOxmlElement):
+    """`p:timing` element, specifying animations and timed behaviors."""
+
+    _tag_seq = ("p:tnLst", "p:bldLst", "p:extLst")
+    tnLst = ZeroOrOne("p:tnLst", successors=_tag_seq[1:])
+    del _tag_seq
+
+
+class CT_TimeNodeList(BaseOxmlElement):
+    """`p:tnLst` or `p:childTnList` element."""
+
+    def add_video(self, shape_id):
+        """Add a new `p:video` child element for movie having *shape_id*."""
+        video_xml = (
+            "<p:video %s>\n"
+            '  <p:cMediaNode vol="80000">\n'
+            '    <p:cTn id="%d" fill="hold" display="0">\n'
+            "      <p:stCondLst>\n"
+            '        <p:cond delay="indefinite"/>\n'
+            "      </p:stCondLst>\n"
+            "    </p:cTn>\n"
+            "    <p:tgtEl>\n"
+            '      <p:spTgt spid="%d"/>\n'
+            "    </p:tgtEl>\n"
+            "  </p:cMediaNode>\n"
+            "</p:video>\n" % (nsdecls("p"), self._next_cTn_id, shape_id)
+        )
+        video = parse_xml(video_xml)
+        self.append(video)
+
+    @property
+    def _next_cTn_id(self):
+        """Return the next available unique ID (int) for p:cTn element."""
+        cTn_id_strs = self.xpath("/p:sld/p:timing//p:cTn/@id")
+        ids = [int(id_str) for id_str in cTn_id_strs]
+        return max(ids) + 1
+
+
+class CT_TLMediaNodeVideo(BaseOxmlElement):
+    """`p:video` element, specifying video media details."""
+
+    _tag_seq = ("p:cMediaNode",)
+    cMediaNode = OneAndOnlyOne("p:cMediaNode")
+    del _tag_seq