diff --git a/Cargo.lock b/Cargo.lock
index 40f895f5..6b735c5d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1112,7 +1112,7 @@ dependencies = [
 
 [[package]]
 name = "designcraft-pptx"
-version = "0.5.0"
+version = "0.8.0"
 dependencies = [
  "designcraft-color",
  "designcraft-compose",
@@ -1121,7 +1121,7 @@ dependencies = [
  "designcraft-geom",
  "designcraft-images",
  "image",
- "quick-xml 0.38.4",
+ "quick-xml",
  "skrifa 0.47.0",
  "thiserror 2.0.21",
  "zip",
diff --git a/crates/engine/src/cmd/export.rs b/crates/engine/src/cmd/export.rs
index 22cd2b44..f10f3037 100644
--- a/crates/engine/src/cmd/export.rs
+++ b/crates/engine/src/cmd/export.rs
@@ -102,7 +102,7 @@ fn export_pptx(s: &mut Session, p: &Value) -> Result<Value> {
     match str_param(p, "path") {
         Some(path) => {
             #[cfg(not(target_arch = "wasm32"))]
-            std::fs::write(path, &r.bytes).map_err(|e| EngineError::Other(format!("{path}: {e}")))?;
+            crate::io::write_file(path, &r.bytes).map_err(EngineError::Other)?;
             Ok(json!({"path": path, "bytes": r.bytes.len(), "slides": r.slides, "warnings": r.warnings}))
         }
         None => Ok(json!({"base64": super::file::base64_encode(&r.bytes), "bytes": r.bytes.len(), "slides": r.slides, "warnings": r.warnings})),
diff --git a/crates/engine/src/cmd/style.rs b/crates/engine/src/cmd/style.rs
index fc610ff3..1cccc7fd 100644
--- a/crates/engine/src/cmd/style.rs
+++ b/crates/engine/src/cmd/style.rs
@@ -539,12 +539,16 @@ fn rename_style(d: &mut designcraft_doc::Document, para: bool, from: &str, to: &
 /// instead removes the entry, after its former uses point at the replacement).
 fn redirect_style_refs(d: &mut designcraft_doc::Document, para: bool, from: &str, to: &str) {
     let st = d.styles_mut();
+    // A style is never based on itself: when `to` was based on `from`, it takes `from`'s parent.
+    let parent_of = |based_on: Option<&String>| based_on.filter(|b| b.as_str() != to).cloned();
     if para {
+        let from_parent = parent_of(st.paragraph.iter().find(|x| x.name == from).and_then(|x| x.based_on.as_ref()));
         for s in &mut st.paragraph {
-            for r in [&mut s.based_on, &mut s.next_style] {
-                if r.as_deref() == Some(from) {
-                    *r = Some(to.to_string());
-                }
+            if s.based_on.as_deref() == Some(from) {
+                s.based_on = if s.name == to { from_parent.clone() } else { Some(to.to_string()) };
+            }
+            if s.next_style.as_deref() == Some(from) {
+                s.next_style = Some(to.to_string());
             }
         }
         for o in &mut st.object {
@@ -553,9 +557,10 @@ fn redirect_style_refs(d: &mut designcraft_doc::Document, para: bool, from: &str
             }
         }
     } else {
+        let from_parent = parent_of(st.character.iter().find(|x| x.name == from).and_then(|x| x.based_on.as_ref()));
         for s in &mut st.character {
             if s.based_on.as_deref() == Some(from) {
-                s.based_on = Some(to.to_string());
+                s.based_on = if s.name == to { from_parent.clone() } else { Some(to.to_string()) };
             }
         }
         for s in &mut st.paragraph {
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index 1126b74c..616a8639 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -701,6 +701,23 @@ fn paragraph_style_delete_rejects_missing_unknown_and_self_replacement() {
     assert!(s.execute("style.paragraph.delete", &json!({"name": name, "replaceWith": name})).is_err(), "replaceWith can't be the deleted style");
 }
 
+#[test]
+fn deleting_a_style_never_leaves_its_replacement_based_on_itself() {
+    let mut s = session();
+    let para = |s: &Session, n: &str| s.doc().unwrap().doc.styles.para(n).unwrap().based_on.clone();
+    s.execute("style.paragraph.create", &json!({"name": "Head"})).unwrap();
+    s.execute("style.paragraph.create", &json!({"name": "Sub", "basedOn": "Head"})).unwrap();
+    s.execute("style.paragraph.create", &json!({"name": "Minor", "basedOn": "Sub"})).unwrap();
+    // Minor is based on Sub; deleting Sub in favour of Minor gives Minor Sub's parent.
+    s.execute("style.paragraph.delete", &json!({"name": "Sub", "replaceWith": "Minor"})).unwrap();
+    assert_eq!(para(&s, "Minor").as_deref(), Some("Head"));
+    s.execute("style.character.create", &json!({"name": "Strong"})).unwrap();
+    s.execute("style.character.create", &json!({"name": "Stronger", "basedOn": "Strong"})).unwrap();
+    s.execute("style.character.delete", &json!({"name": "Strong", "replaceWith": "Stronger"})).unwrap();
+    let based = s.doc().unwrap().doc.styles.character.iter().find(|c| c.name == "Stronger").unwrap().based_on.clone();
+    assert_ne!(based.as_deref(), Some("Stronger"));
+}
+
 #[test]
 fn character_style_delete_reassigns_every_kind_of_reference() {
     let mut s = session();
diff --git a/crates/pptx/src/slide.rs b/crates/pptx/src/slide.rs
index f4cf4386..03fd0e8b 100644
--- a/crates/pptx/src/slide.rs
+++ b/crates/pptx/src/slide.rs
@@ -208,7 +208,8 @@ pub struct Exporter<'a> {
     pub to_slide: Affine,
     /// The page's bleed area in spread space (items outside it are left out).
     clip: Rect,
-    pub page_name: Option<String>,
+    /// The page parent items are composed for (page numbers, running heads).
+    pub page: Option<usize>,
 }
 
 impl<'a> Exporter<'a> {
@@ -227,7 +228,7 @@ impl<'a> Exporter<'a> {
             rel_of: HashMap::new(),
             to_slide: Affine::IDENTITY,
             clip: Rect::ZERO,
-            page_name: None,
+            page: None,
         }
     }
 
@@ -276,9 +277,9 @@ impl<'a> Exporter<'a> {
                         continue;
                     }
                     // Parent items compose per page (page numbers, running heads).
-                    self.page_name = Some(page_name.clone());
+                    self.page = Some(abs);
                     self.item(it, Affine::translate((dx, 0.0)), 1.0);
-                    self.page_name = None;
+                    self.page = None;
                 }
             }
             for it in &sp.items {
diff --git a/crates/pptx/src/text.rs b/crates/pptx/src/text.rs
index 96671771..b15cbe71 100644
--- a/crates/pptx/src/text.rs
+++ b/crates/pptx/src/text.rs
@@ -92,7 +92,7 @@ pub(crate) struct Segment {
 
 pub fn frame(ex: &mut Exporter, it: &Item, tfr: &TextFrame, xf: Affine, opacity: f32) {
     let doc = ex.doc;
-    let cs = ex.cache.get(doc, tfr.story, ex.page_name.as_deref());
+    let cs = ex.cache.get(doc, tfr.story, ex.page);
     let Some(ft) = cs.frame(it.id) else {
         ex.shape(it, xf, opacity, None);
         return;
diff --git a/crates/ui-egui/src/i18n/ka.rs b/crates/ui-egui/src/i18n/ka.rs
index 350ea526..b3379c6d 100644
--- a/crates/ui-egui/src/i18n/ka.rs
+++ b/crates/ui-egui/src/i18n/ka.rs
@@ -1830,4 +1830,5 @@ pub(super) const TABLE: &[(&str, &str)] = &[
     ("Convert to Flex Layout", "მოქნილ განლაგებად გარდაქმნა"),
     ("Remove Flex Layout", "მოქნილი განლაგების წაშლა"),
     ("Show Flex Controls", "მოქნილი მართვის ელემენტების ჩვენება"),
+    ("Export PowerPoint…", "PowerPoint-ად ექსპორტი…"),
 ];