diff --git a/ROADMAP.md b/ROADMAP.md
index ac8472d57..fe15cfc14 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,6 +2,17 @@
 
 - FID1: PDF export normalizes mixed emitted gradient color spaces to RGB with an explicit warning; homogeneous device-space gradients retain their components. Linear/radial, midpoint, archival and print policies have synthetic regression coverage.
 
+- CJK-MOJI8: preserve shaped narrow punctuation when tracking changes its advance.
+- CJK-MOJI7: prevent numeric coercion in Mojikumi import, preserve finite unsupported rules, and check nested note/cell rules in preflight.
+- CJK-MOJI6: apply spacing at shaped-cluster boundaries without moving attached marks.
+- CJK-MOJI5: share equal-priority boundary spacing and honor discrete compression endpoints, including leading-only ragged-line fitting.
+
+- CJK-MOJI3: use the composition rule resolver in preflight, report unknown Mojikumi presets and retain regression coverage for supported and unsupported settings.
+
+- CJK-MOJI2: share Mojikumi pair and line-edge metrics between breaking and placement; honor spacing bounds, compression priorities, explicit aki and kinsoku policies.
+
+- CJK-MOJI1: resolve Chinese and half-em Mojikumi presets and directional custom overrides; preserve IDML table references independently of display names.
+
 - FONT7: replacement recommendations check the characters actually used; placeholder LastResort fonts and glyph-zero mappings cannot masquerade as glyph coverage or suppress missing-glyph diagnostics.
 
 - FONT6: localized and legacy family/style names share canonical resolution across shaping, inventory and replacement. Known compatible and script-based substitutes retain missing status; Find Font shows the resolved face and offers it as the replacement, while preflight reports unavailable styles.
diff --git a/crates/compose/src/breaker.rs b/crates/compose/src/breaker.rs
index 3b08e1050..8aec5df04 100644
--- a/crates/compose/src/breaker.rs
+++ b/crates/compose/src/breaker.rs
@@ -50,6 +50,8 @@ pub struct Spacing {
     pub optical: bool,
     /// Korean text breaks between syllables instead of at spaces.
     pub korean_char_breaks: bool,
+    /// 0: minimum adjustment; 1: push in; 2: push out first; 3: push out only.
+    pub kinsoku_priority: u8,
 }
 
 impl Default for Spacing {
@@ -71,6 +73,7 @@ impl Default for Spacing {
             hyph_zone: 0.0,
             optical: false,
             korean_char_breaks: false,
+            kinsoku_priority: 0,
         }
     }
 }
@@ -78,13 +81,18 @@ impl Default for Spacing {
 impl Spacing {
     /// Per-tier (word, letter, glyph) stretch and shrink of glyph `g` as a box.
     fn box_elastic(&self, g: &Glyph) -> ([f64; 3], [f64; 3]) {
-        if !self.justify || g.locked_advance {
+        if g.locked_advance {
             return ([0.0; 3], [0.0; 3]);
         }
+        let moji_stretch = if self.justify { g.moji.stretch } else { 0.0 };
+        let moji_shrink = if self.kinsoku_priority == 3 { 0.0 } else { g.moji.shrink };
+        if !self.justify {
+            return ([0.0; 3], [moji_shrink, 0.0, 0.0]);
+        }
         let natural = g.adv / self.glyph_desired.max(0.01);
         (
-            [0.0, g.space * (self.letter_max - self.letter_desired).max(0.0), natural * (self.glyph_max - self.glyph_desired).max(0.0)],
-            [0.0, g.space * (self.letter_desired - self.letter_min).max(0.0), natural * (self.glyph_desired - self.glyph_min).max(0.0)],
+            [moji_stretch, g.space * (self.letter_max - self.letter_desired).max(0.0), natural * (self.glyph_max - self.glyph_desired).max(0.0)],
+            [moji_shrink, g.space * (self.letter_desired - self.letter_min).max(0.0), natural * (self.glyph_desired - self.glyph_min).max(0.0)],
         )
     }
     /// Word-space stretch and shrink of space glyph `g` (only U+0020 is elastic).
@@ -146,6 +154,8 @@ struct Item {
     auto: bool,
     /// Breaks: optical hang of the glyph ending the line. Boxes: hang of the glyph starting one.
     hang: f64,
+    edge_elastic: [f64; 2],
+    start_elastic: [f64; 2],
     /// Auto hyphenation points: index of the break opportunity before the word (or `NONE`).
     zone_from: usize,
 }
@@ -154,13 +164,49 @@ const NONE: usize = usize::MAX;
 
 impl Item {
     fn boxed(w: f64, st: [f64; 3], sh: [f64; 3]) -> Item {
-        Item { kind: Kind::Box, w, st, sh, p: 0.0, flagged: false, auto: false, hang: 0.0, zone_from: NONE }
+        Item {
+            kind: Kind::Box,
+            w,
+            st,
+            sh,
+            p: 0.0,
+            flagged: false,
+            auto: false,
+            hang: 0.0,
+            edge_elastic: [0.0; 2],
+            start_elastic: [0.0; 2],
+            zone_from: NONE,
+        }
     }
     fn glue(w: f64, st: f64, sh: f64) -> Item {
-        Item { kind: Kind::Glue, w, st: [st, 0.0, 0.0], sh: [sh, 0.0, 0.0], p: 0.0, flagged: false, auto: false, hang: 0.0, zone_from: NONE }
+        Item {
+            kind: Kind::Glue,
+            w,
+            st: [st, 0.0, 0.0],
+            sh: [sh, 0.0, 0.0],
+            p: 0.0,
+            flagged: false,
+            auto: false,
+            hang: 0.0,
+            edge_elastic: [0.0; 2],
+            start_elastic: [0.0; 2],
+            zone_from: NONE,
+        }
     }
     fn penalty(w: f64, p: f64, flagged: bool) -> Item {
-        Item { kind: Kind::Penalty, w, st: [0.0; 3], sh: [0.0; 3], p, flagged, auto: false, hang: 0.0, zone_from: NONE }
+        Item {
+            kind: Kind::Penalty,
+            w,
+            st: [0.0; 3],
+            sh: [0.0; 3],
+            p,
+            flagged,
+            auto: false,
+            hang: 0.0,
+            edge_elastic: [0.0; 2],
+            start_elastic: [0.0; 2],
+            zone_from: NONE,
+        }
     }
 }
 
@@ -235,7 +281,7 @@ fn hang_left(g: &Glyph) -> f64 {
 }
 
 fn right_hang(g: &Glyph, sp: &Spacing) -> f64 {
-    g.cjk_hang.max(if sp.optical { hang_right(g) } else { 0.0 })
+    g.cjk_hang.max(if sp.optical { hang_right(g) } else { 0.0 }) - g.moji.end
 }
 
 fn hang_right(g: &Glyph) -> f64 {
@@ -287,6 +333,9 @@ fn items(glyphs: &[Glyph], hyph_after: &[bool], sp: &Spacing) -> (Vec<Item>, Vec
             ig.push(i);
             let mut p = Item::penalty(0.0, -INF, false);
             p.hang = prev_hang;
+            if let Some(prev) = i.checked_sub(1).and_then(|j| glyphs.get(j)) {
+                p.edge_elastic = crate::mojikumi::end_elastic(prev, sp.justify, sp.kinsoku_priority != 3);
+            }
             it.push(p);
             ig.push(i + 1);
             last_space = NONE;
@@ -298,6 +347,9 @@ fn items(glyphs: &[Glyph], hyph_after: &[bool], sp: &Spacing) -> (Vec<Item>, Vec
                 let (st, sh) = sp.space_elastic(g);
                 let mut gl = Item::glue(w, st, sh);
                 gl.hang = prev_hang;
+                if let Some(prev) = i.checked_sub(1).and_then(|j| glyphs.get(j)) {
+                    gl.edge_elastic = crate::mojikumi::end_elastic(prev, sp.justify, sp.kinsoku_priority != 3);
+                }
                 last_space = it.len();
                 it.push(gl);
                 ig.push(i);
@@ -307,6 +359,9 @@ fn items(glyphs: &[Glyph], hyph_after: &[bool], sp: &Spacing) -> (Vec<Item>, Vec
                 ig.push(i);
                 let mut p = Item::penalty(0.0, 0.0, false);
                 p.hang = prev_hang;
+                if let Some(prev) = i.checked_sub(1).and_then(|j| glyphs.get(j)) {
+                    p.edge_elastic = crate::mojikumi::end_elastic(prev, sp.justify, sp.kinsoku_priority != 3);
+                }
                 last_space = it.len();
                 it.push(p);
                 ig.push(i);
@@ -328,9 +383,8 @@ fn items(glyphs: &[Glyph], hyph_after: &[bool], sp: &Spacing) -> (Vec<Item>, Vec
         }
         let (st, sh) = sp.box_elastic(g);
         let mut bx = Item::boxed(g.adv, st, sh);
-        if sp.optical {
-            bx.hang = hang_left(g);
-        }
+        bx.hang = (if sp.optical { hang_left(g) } else { 0.0 }) - g.moji.start;
+        bx.start_elastic = crate::mojikumi::start_elastic(g, sp.justify, sp.kinsoku_priority != 3);
         it.push(bx);
         ig.push(i);
         let next_is_space = glyphs.get(i + 1).is_none_or(|n| n.is_space());
@@ -338,10 +392,12 @@ fn items(glyphs: &[Glyph], hyph_after: &[bool], sp: &Spacing) -> (Vec<Item>, Vec
             if matches!(g.ch, '-' | '\u{2010}') {
                 let mut p = Item::penalty(0.0, 50.0, true);
                 p.hang = right_hang(g, sp);
+                p.edge_elastic = crate::mojikumi::end_elastic(g, sp.justify, sp.kinsoku_priority != 3);
                 push_inword(&mut it, &mut ig, p, i + 1, sp);
             } else if matches!(g.ch, '\u{2013}' | '\u{2014}' | '/') || g.break_after.unwrap_or_else(|| cjk_break(g, &glyphs[i + 1], sp)) {
                 let mut p = Item::penalty(0.0, 0.0, false);
                 p.hang = right_hang(g, sp);
+                p.edge_elastic = crate::mojikumi::end_elastic(g, sp.justify, sp.kinsoku_priority != 3);
                 push_inword(&mut it, &mut ig, p, i + 1, sp);
             } else if hyph_after[i] {
                 let hw = hyphen_width(g, &mut hy_cache);
@@ -360,6 +416,9 @@ fn items(glyphs: &[Glyph], hyph_after: &[bool], sp: &Spacing) -> (Vec<Item>, Vec
     ig.push(n);
     let mut p = Item::penalty(0.0, -INF, false);
     p.hang = if n > 0 { right_hang(&glyphs[n - 1], sp) } else { 0.0 };
+    if let Some(g) = glyphs.last() {
+        p.edge_elastic = crate::mojikumi::end_elastic(g, sp.justify, sp.kinsoku_priority != 3);
+    }
     it.push(p);
     ig.push(n);
     (it, ig)
@@ -422,9 +481,21 @@ fn kp_pass(
             sz[i + 1][t] = sz[i][t] + z[t];
         }
     }
-    let first_hang = items.iter().find(|i| i.kind == Kind::Box).map_or(0.0, |b| b.hang);
-    let mut arena: Vec<Node> =
-        vec![Node { pos: 0, line: 0, fitness: 1, tw: first_hang, ty: [0.0; 3], tz: [0.0; 3], demerits: 0.0, prev: None, hyphens: 0, flagged: false }];
+    let first_box = items.iter().find(|i| i.kind == Kind::Box);
+    let first_hang = first_box.map_or(0.0, |b| b.hang);
+    let first_elastic = first_box.map_or([0.0; 2], |b| b.start_elastic);
+    let mut arena: Vec<Node> = vec![Node {
+        pos: 0,
+        line: 0,
+        fitness: 1,
+        tw: first_hang,
+        ty: [-first_elastic[0], 0.0, 0.0],
+        tz: [-first_elastic[1], 0.0, 0.0],
+        demerits: 0.0,
+        prev: None,
+        hyphens: 0,
+        flagged: false,
+    }];
     let limit = sp.hyphen_limit as usize;
     let states = if limit == 0 { 2 } else { (limit + 1).min(MAX_HYPHEN_STATES) };
     let mut active: Vec<usize> = vec![0];
@@ -454,6 +525,8 @@ fn kp_pass(
                 y[t] = sy[b][t] - n.ty[t];
                 z[t] = sz[b][t] - n.tz[t];
             }
+            y[0] = (y[0] + it.edge_elastic[0]).max(0.0);
+            z[0] = (z[0] + it.edge_elastic[1]).max(0.0);
             let (r, feasible) = tiered_ratio(target - l, y, z);
             if feasible && !forced {
                 keep.push(a);
@@ -477,7 +550,12 @@ fn kp_pass(
                     }
                 }
             }
-            let bad = 100.0 * r.abs().powi(3);
+            let preference = match sp.kinsoku_priority {
+                1 if r > 0.0 => 4.0,
+                2 if r < 0.0 => 4.0,
+                _ => 1.0,
+            };
+            let bad = preference * 100.0 * r.abs().powi(3);
             let lp = 10.0 + bad;
             let mut d = if pp >= 0.0 {
                 lp * lp + pp * pp
@@ -531,6 +609,8 @@ fn kp_pass(
             match x.kind {
                 Kind::Box => {
                     tw += x.hang;
+                    ty[0] -= x.start_elastic[0];
+                    tz[0] -= x.start_elastic[1];
                     break;
                 }
                 Kind::Glue => {
@@ -641,8 +721,9 @@ pub fn greedy(glyphs: &[Glyph], hyph_after: &[bool], sp: &Spacing, width: &dyn F
     let may_hyphenate = |hyphens: u32| sp.hyphen_limit == 0 || hyphens < sp.hyphen_limit;
     while start < n {
         let w = width(line).max(1.0);
-        let mut x = if sp.optical { -hang_left(&glyphs[start]) } else { 0.0 };
-        let mut shrink = 0.0;
+        let mut x = (if sp.optical { -hang_left(&glyphs[start]) } else { 0.0 }) + glyphs[start].moji.start;
+        let mut shrink = crate::mojikumi::start_elastic(&glyphs[start], sp.justify, sp.kinsoku_priority != 3)[1];
+        let mut last_natural: Option<(usize, bool)> = None;
         let mut last_ok: Option<(usize, bool)> = None; // (break position = end glyph, hyphen)
         let mut last_space: Option<(usize, f64)> = None; // (break position, line width there)
         let mut i = start;
@@ -658,13 +739,25 @@ pub fn greedy(glyphs: &[Glyph], hyph_after: &[bool], sp: &Spacing, width: &dyn F
                     shrink += sp.space_elastic(g).1;
                 }
                 last_ok = Some((i, false));
+                if x <= w {
+                    last_natural = last_ok;
+                }
                 last_space = Some((i, x));
                 x += g.adv;
                 i += 1;
                 continue;
             }
             let hang_r = right_hang(g, sp);
-            if x + g.adv - hang_r > w + shrink
+            let end_shrink = crate::mojikumi::end_elastic(g, sp.justify, sp.kinsoku_priority != 3)[1];
+            let available = shrink + sp.box_elastic(g).1.iter().sum::<f64>() + end_shrink;
+            if sp.kinsoku_priority == 2
+                && x + g.adv - hang_r > w
+                && let Some((end, hyphen)) = last_natural
+            {
+                brk = Some((end, hyphen, false));
+                break;
+            }
+            if x + g.adv - hang_r > w + available.max(0.0)
                 && i > start
                 && (last_ok.is_some() || glyphs.get(i - 1).is_none_or(|p| p.break_after != Some(false) && !p.no_break))
             {
@@ -680,14 +773,15 @@ pub fn greedy(glyphs: &[Glyph], hyph_after: &[bool], sp: &Spacing, width: &dyn F
                 break;
             }
             x += g.adv;
-            if sp.justify {
-                shrink += sp.box_elastic(g).1.iter().sum::<f64>();
-            }
+            shrink += sp.box_elastic(g).1.iter().sum::<f64>();
             if i + 1 < n && !glyphs[i + 1].is_space() && !g.no_break && g.break_after != Some(false) {
                 if matches!(g.ch, '-' | '\u{2010}' | '\u{2013}' | '\u{2014}' | '/')
                     || g.break_after.unwrap_or_else(|| cjk_break(g, &glyphs[i + 1], sp))
                 {
                     last_ok = Some((i + 1, false));
+                    if x - hang_r <= w {
+                        last_natural = last_ok;
+                    }
                 } else if hyph_after[i] && may_hyphenate(hyphens) {
                     let hy = hyphen_width(g, &mut hy_cache) * if sp.optical { 1.0 - hang('-').1 } else { 1.0 };
                     if x + hy <= w + shrink {
diff --git a/crates/compose/src/lib.rs b/crates/compose/src/lib.rs
index 861272cfc..a6365309a 100644
--- a/crates/compose/src/lib.rs
+++ b/crates/compose/src/lib.rs
@@ -14,6 +14,7 @@ mod bidi;
 pub mod breaker;
 mod cache;
 pub mod hyphen;
+mod mojikumi;
 mod notes;
 mod overlay;
 mod ruby;
@@ -660,6 +661,7 @@ fn compose_with_db(doc: &Document, story: &Story, frames: &[FrameSpec], opts: &C
                     (col.width() - pp.left_indent - pp.right_indent - ind).max(1.0)
                 };
                 apply_desired_spacing(&mut gl, &pp);
+                mojikumi::apply(&mut gl, &doc.styles, &pp.mojikumi);
                 let hy = hyphenation_points(&story.text, &gl, &pp, &hyph_exceptions, &foreign_ranges(doc, story, prange.clone(), &base_chars));
                 let breaks = if pp.composer == Composer::SingleLine || gl.iter().any(|g| g.ch == '\t') || gl.len() > 4000 {
                     breaker::greedy(&gl, &hy, &spacing, &width)
@@ -752,6 +754,7 @@ fn compose_with_db(doc: &Document, story: &Story, frames: &[FrameSpec], opts: &C
         );
         bidi::resolve_mirroring(&mut glyphs, &bidi_info);
         apply_desired_spacing(&mut glyphs, &pp);
+        mojikumi::apply(&mut glyphs, &doc.styles, &pp.mojikumi);
         let hyph_after = hyphenation_points(&story.text, &glyphs, &pp, &hyph_exceptions, &foreign_ranges(doc, story, prange.clone(), &base_chars));
         let base_size = base_chars.size;
         let spacing = spacing_for(&pp, base_size);
@@ -1305,6 +1308,12 @@ fn spacing_for(pp: &ParaProps, base_size: f64) -> Spacing {
         hyph_zone: if pp.align.is_justified() { 0.0 } else { pp.hyph_zone },
         optical: pp.optical_margin,
         korean_char_breaks: pp.korean_char_breaks,
+        kinsoku_priority: match pp.kinsoku_type.as_str() {
+            "KinsokuPushInFirst" => 1,
+            "KinsokuPushOutFirst" => 2,
+            "KinsokuPushOutOnly" => 3,
+            _ => 0,
+        },
     }
 }
 
@@ -1820,6 +1829,7 @@ fn layout_line(
     bidi_info: &unicode_bidi::BidiInfo<'_>,
 ) -> (Vec<PlacedGlyph>, f64, f64) {
     let mut line: Vec<Glyph> = glyphs[s..e.max(s)].to_vec();
+    mojikumi::edges(&mut line);
     let reference = line.iter().max_by(|a, b| a.size.total_cmp(&b.size)).cloned();
     if let Some(reference) = reference {
         for g in &mut line {
@@ -1910,7 +1920,10 @@ fn layout_line(
     };
     let justify_this = align.is_justified() && (!last || align == Align::FullyJustified || forced_mid) && !has_tab;
     // A justified paragraph's last line may have been composed with shrunk spaces: shrink it too.
-    let squeeze_last = align.is_justified() && !justify_this && !has_tab && extra < 0.0 && !spaces.is_empty();
+    let squeeze_last = !justify_this
+        && !has_tab
+        && extra < 0.0
+        && (align.is_justified() || line.iter().any(|g| g.moji.shrink > 0.0 || mojikumi::start_elastic(g, false, true)[1] > 0.0));
     // Extra advance per glyph (word spaces and letter gaps) and horizontal scale per glyph.
     let mut add = vec![0.0; line.len()];
     let mut scale = vec![1.0; line.len()];
@@ -1929,6 +1942,9 @@ fn layout_line(
             }
         }
     }
+    if (justify_this || squeeze_last) && (extra >= 0.0 || sp.kinsoku_priority != 3) {
+        extra = mojikumi::distribute(&mut line, extra, &mut add);
+    }
     if (justify_this || squeeze_last) && !spaces.is_empty() {
         distribute(&line, &spaces, extra, sp, &mut add, &mut scale);
     } else if justify_this && spaces.is_empty() && line.len() > 1 && !last {
@@ -1939,13 +1955,13 @@ fn layout_line(
                     .iter()
                     .enumerate()
                     .take(line.len() - 1)
-                    .filter(|(_, g)| !g.locked_advance || g.break_after != Some(false))
+                    .filter(|(_, g)| !g.moji.active && (!g.locked_advance || g.break_after != Some(false)))
                     .map(|(i, _)| i)
                     .collect();
                 if !gaps.is_empty() {
                     let per = extra / gaps.len() as f64;
                     for i in gaps {
-                        add[i] = per;
+                        add[i] += per;
                     }
                 }
             }
diff --git a/crates/compose/src/mojikumi.rs b/crates/compose/src/mojikumi.rs
new file mode 100644
index 000000000..a1ca09c9e
--- /dev/null
+++ b/crates/compose/src/mojikumi.rs
@@ -0,0 +1,222 @@
+//! Mojikumi boundary widths. The same values feed line selection and placement.
+use crate::shape::Glyph;
+use designcraft_doc::{
+    Styles,
+    mojikumi::{self as rules, Aki, Rules},
+};
+
+#[derive(Clone, Copy, Debug, Default)]
+pub struct Metrics {
+    pub active: bool,
+    /// Shaped body width before tracking and manual character spacing.
+    pub body: f64,
+    pub blank_before: f64,
+    pub blank_after: f64,
+    /// Desired internal gap attached to this glyph's advance.
+    pub gap: f64,
+    pub stretch: f64,
+    pub shrink: f64,
+    pub priority: u8,
+    pub discrete: bool,
+    /// Width changes when this glyph starts / ends a line.
+    pub start: f64,
+    pub end: f64,
+    pub end_aki: Aki,
+    pub start_aki: Aki,
+    pub at_start: bool,
+    pub explicit_before: bool,
+    pub explicit_after: bool,
+}
+
+fn eligible(g: &Glyph) -> bool {
+    g.adv > 0.0
+        && !g.locked_advance
+        && !g.ch.is_control()
+        && (!g.ch.is_whitespace() || g.ch == '\u{3000}')
+        && !matches!(g.ch, '\u{e000}'..='\u{e1ff}')
+}
+fn em(g: &Glyph) -> f64 {
+    // Actual scaled em, including vertical and composite-font scaling.
+    g.face.units_per_em() * if g.upright { g.sy } else { g.sx }
+}
+
+pub fn apply(glyphs: &mut [Glyph], styles: &Styles, name: &str) {
+    let Ok(Some(table)) = Rules::resolve(styles, name) else { return };
+    // Boundaries belong to shaped clusters, not individual glyphs. In particular
+    // the advance carrying a following gap must come after all attached marks.
+    let mut clusters = Vec::new();
+    let mut start = 0;
+    while start < glyphs.len() {
+        let byte = glyphs[start].byte;
+        let mut end = start + 1;
+        while end < glyphs.len() && glyphs[end].byte == byte {
+            end += 1;
+        }
+        clusters.push((start, end));
+        start = end;
+    }
+    for &(start, end) in &clusters {
+        let cluster = &mut glyphs[start..end];
+        if !cluster.iter().any(eligible) {
+            continue;
+        }
+        let class = rules::class(cluster[0].rendered_char);
+        let unit = em(&cluster[0]);
+        let body: f64 = cluster.iter().map(|g| g.moji.body).sum();
+        for g in cluster.iter_mut() {
+            g.moji.active = true;
+        }
+        // Tracking must not make a proportional or half-width glyph appear to
+        // contain a removable half-em body. Shaping features already affect body.
+        if body >= unit * 0.8 {
+            let before = if cluster[0].moji.explicit_before { 0.0 } else { rules::leading(class) * unit };
+            let after = if cluster[0].moji.explicit_after { 0.0 } else { rules::trailing(class) * unit };
+            let trim = before + after;
+            if let Some(owner) = cluster.iter().position(|g| g.adv >= trim) {
+                cluster[0].moji.blank_before = before / unit.max(1e-9);
+                cluster[end - start - 1].moji.blank_after = after / unit.max(1e-9);
+                cluster[owner].adv -= trim;
+                for (i, g) in cluster.iter_mut().enumerate() {
+                    g.dx += if i > owner { trim - before } else { -before };
+                }
+            }
+        }
+        let head = &mut cluster[0];
+        head.moji.start_aki = table.pair_with_bodies(if start == 0 { 23 } else { 22 }, class, 0.0, head.moji.blank_before);
+        head.moji.start = if head.moji.explicit_before { 0.0 } else { head.moji.start_aki.desired * unit };
+    }
+    for (index, &(start, end)) in clusters.iter().enumerate() {
+        if !glyphs[start].moji.active {
+            continue;
+        }
+        let class = rules::class(glyphs[start].rendered_char);
+        let unit = em(&glyphs[start]);
+        let mut gap = Aki::default();
+        if let Some(&(next, _)) = clusters.get(index + 1)
+            && glyphs[next].moji.active
+            && !glyphs[end - 1].moji.explicit_after
+            && !glyphs[next].moji.explicit_before
+        {
+            gap = table.pair_with_bodies(
+                class,
+                rules::class(glyphs[next].rendered_char),
+                glyphs[end - 1].moji.blank_after,
+                glyphs[next].moji.blank_before,
+            );
+        }
+        let width: f64 = glyphs[start..end].iter().map(|g| g.adv).sum();
+        let g = &mut glyphs[end - 1];
+        g.moji.end_aki = table.pair_with_bodies(class, 22, g.moji.blank_after, 0.0);
+        let desired = (gap.desired * unit).max(-width);
+        g.moji.gap = desired;
+        g.moji.stretch = (gap.max * unit - desired).max(0.0);
+        g.moji.shrink = (desired - gap.min * unit).max(0.0).min(width + desired);
+        g.moji.priority = gap.priority;
+        g.moji.discrete = gap.discrete;
+        g.moji.end = if g.moji.explicit_after { 0.0 } else { g.moji.end_aki.desired * unit } - desired;
+        g.adv += desired;
+    }
+}
+
+pub fn edges(line: &mut [Glyph]) {
+    if let Some(g) = line.first_mut() {
+        g.moji.at_start = true;
+        g.adv += g.moji.start;
+        g.dx += g.moji.start;
+    }
+    if let Some(g) = line.iter_mut().rev().find(|g| !crate::breaker::is_forced(g.ch)) {
+        g.adv += g.moji.end;
+        // A line-end gap is not the internal gap that happened to follow it.
+        let unit = em(g);
+        let aki = g.moji.end_aki;
+        g.moji.stretch = if g.moji.explicit_after { 0.0 } else { (aki.max - aki.desired).max(0.0) * unit };
+        g.moji.shrink = if g.moji.explicit_after { 0.0 } else { (aki.desired - aki.min).max(0.0) * unit };
+        g.moji.priority = aki.priority;
+        g.moji.discrete = aki.discrete;
+    }
+}
+
+/// Consume spacing in priority order; discrete rules use an entire endpoint.
+/// Returns the residual for ordinary word/letter/glyph justification.
+pub fn distribute(line: &mut [Glyph], extra: f64, add: &mut [f64]) -> f64 {
+    let mut rem = extra.abs();
+    let sign = extra.signum();
+    let properties = |g: &Glyph, before: bool| {
+        if before {
+            let a = g.moji.start_aki;
+            let cap = if !g.moji.at_start || g.moji.explicit_before {
+                0.0
+            } else if sign < 0.0 {
+                (a.desired - a.min).max(0.0) * em(g)
+            } else {
+                (a.max - a.desired).max(0.0) * em(g)
+            };
+            (a.priority, a.discrete, cap)
+        } else {
+            (g.moji.priority, g.moji.discrete, if sign < 0.0 { g.moji.shrink } else { g.moji.stretch })
+        }
+    };
+    for priority in 0..=10 {
+        if rem <= 1e-9 {
+            break;
+        }
+        // Leading and following continuous gaps participate in one pool.
+        // Equal priorities must not depend on whether a gap precedes a glyph.
+        let total: f64 = line
+            .iter()
+            .flat_map(|g| [true, false].map(|before| properties(g, before)))
+            .filter(|&(p, discrete, _)| p == priority && !discrete)
+            .map(|(_, _, cap)| cap)
+            .sum();
+        if total > 0.0 {
+            let take = rem.min(total);
+            for (g, a) in line.iter_mut().zip(add.iter_mut()) {
+                for before in [true, false] {
+                    let (p, discrete, cap) = properties(g, before);
+                    if p == priority && !discrete {
+                        let amount = sign * take * cap / total;
+                        *a += amount;
+                        if before {
+                            g.dx += amount;
+                        }
+                    }
+                }
+            }
+            rem -= take;
+        }
+        // Never interpolate a non-floating rule. Compression may have to use
+        // its entire endpoint even when that leaves a little unused line width;
+        // refusing it would contradict the capacity accepted by the breaker.
+        for (g, a) in line.iter_mut().zip(add.iter_mut()) {
+            for before in [true, false] {
+                let (p, discrete, cap) = properties(g, before);
+                if rem > 1e-9 && p == priority && discrete && cap > 0.0 && (sign < 0.0 || cap <= rem + 1e-9) {
+                    *a += sign * cap;
+                    if before {
+                        g.dx += sign * cap;
+                    }
+                    rem -= cap;
+                }
+            }
+        }
+    }
+    sign * rem
+}
+
+/// Replace the final internal gap's elasticity by its line-end elasticity.
+pub fn end_elastic(g: &Glyph, justify: bool, shrink: bool) -> [f64; 2] {
+    let unit = em(g);
+    let a = g.moji.end_aki;
+    [
+        if justify { (if g.moji.explicit_after { 0.0 } else { (a.max - a.desired).max(0.0) * unit }) - g.moji.stretch } else { 0.0 },
+        if shrink { (if g.moji.explicit_after { 0.0 } else { (a.desired - a.min).max(0.0) * unit }) - g.moji.shrink } else { 0.0 },
+    ]
+}
+
+pub fn start_elastic(g: &Glyph, justify: bool, shrink: bool) -> [f64; 2] {
+    let a = g.moji.start_aki;
+    if g.moji.explicit_before {
+        return [0.0; 2];
+    }
+    [if justify { (a.max - a.desired).max(0.0) * em(g) } else { 0.0 }, if shrink { (a.desired - a.min).max(0.0) * em(g) } else { 0.0 }]
+}
diff --git a/crates/compose/src/shape.rs b/crates/compose/src/shape.rs
index 68d9788e5..4ef99f9c6 100644
--- a/crates/compose/src/shape.rs
+++ b/crates/compose/src/shape.rs
@@ -54,6 +54,7 @@ pub struct Glyph {
     /// Resolved CJK boundary constraint, independent of glyph outlines.
     pub break_after: Option<bool>,
     pub cjk_hang: f64,
+    pub moji: crate::mojikumi::Metrics,
     pub ideographic_space_elastic: bool,
     pub character_alignment: designcraft_doc::cjk::CharacterAlignment,
     pub leading_model: designcraft_doc::cjk::LeadingModel,
@@ -930,6 +931,7 @@ fn control_glyph(face: &Arc<FontFace>, p: &CharProps, auto_leading: TypeEnv, sty
         space: face.advance(face.glyph_for(' ')) * k * p.h_scale,
         break_after: None,
         cjk_hang: 0.0,
+        moji: crate::mojikumi::Metrics { explicit_before: p.leading_aki.is_some(), explicit_after: p.trailing_aki.is_some(), ..Default::default() },
         ideographic_space_elastic: false,
         character_alignment: p.character_alignment,
         leading_model: p.leading_model,
@@ -1039,6 +1041,7 @@ fn shape_segment(
             (sg.x_offset as f64 * k * hs, -(sg.y_offset as f64) * k * p.v_scale)
         };
         let (ascent, descent) = if up { (em_top * k_v, -em_bottom * k_v) } else { (ascent, descent) };
+        let body = adv;
         if ch == SOFT_HYPHEN {
             adv = 0.0;
         } else if last_in_cluster {
@@ -1076,6 +1079,12 @@ fn shape_segment(
             space,
             break_after: None,
             cjk_hang: 0.0,
+            moji: crate::mojikumi::Metrics {
+                body,
+                explicit_before: p.leading_aki.is_some(),
+                explicit_after: p.trailing_aki.is_some(),
+                ..Default::default()
+            },
             ideographic_space_elastic: false,
             character_alignment: p.character_alignment,
             leading_model: p.leading_model,
@@ -1124,5 +1133,7 @@ pub(crate) fn hyphen_after(g: &Glyph) -> Glyph {
     h.byte = g.byte + g.len;
     h.len = 0;
     h.ch = '-';
+    h.rendered_char = '-';
+    h.moji = Default::default();
     h
 }
diff --git a/crates/compose/src/tests.rs b/crates/compose/src/tests.rs
index 0738c907f..b815b015e 100644
--- a/crates/compose/src/tests.rs
+++ b/crates/compose/src/tests.rs
@@ -3244,3 +3244,331 @@ fn generated_note_labels_use_coverage_fallback() {
     assert_ne!(glyph.gid, 0);
     assert_eq!(glyph.face.family, "Generated Label Coverage");
 }
+
+#[test]
+fn mojikumi_custom_pairs_change_positions_and_breaks_without_font_scaling() {
+    use designcraft_doc::cjk::{MojikumiAki, MojikumiTable};
+    let (mut d, sid, _) = doc_with(
+        "A1A1A1",
+        Rect::new(0.0, 0.0, 55.0, 300.0),
+        ParaAttrs { hyphenate: Some(false), composer: Some(Composer::SingleLine), ..Default::default() },
+    );
+    let before = compose_story(&d, sid, &ComposeOptions::default());
+    Arc::make_mut(&mut d.styles).mojikumi_tables.push(MojikumiTable {
+        name: "Synthetic".into(),
+        based_on: "SimpChineseDefault".into(),
+        overrides: vec![
+            MojikumiAki { target_class: 18, side_class: 25, after: true, minimum: 1.0, desired: 1.0, maximum: 1.0, ..Default::default() },
+            MojikumiAki { target_class: 25, side_class: 18, after: true, minimum: 1.0, desired: 1.0, maximum: 1.0, ..Default::default() },
+        ],
+    });
+    d.story_mut(sid).unwrap().paras[0].para.mojikumi = Some("MojikumiTable/Synthetic".into());
+    let after = compose_story(&d, sid, &ComposeOptions::default());
+    assert!(all_lines(&after).len() > all_lines(&before).len());
+    let a = &all_lines(&after)[0].glyphs;
+    let b = &all_lines(&before)[0].glyphs;
+    assert!((a[1].x - b[1].x - 12.0).abs() < 0.001);
+    assert_eq!(a[0].sx, b[0].sx);
+    assert!(all_lines(&after).iter().all(|l| l.end_x <= l.x1 + 0.01));
+}
+
+#[test]
+fn mojikumi_paragraph_indent_adds_to_paragraph_settings_and_rounds_no_glyphs() {
+    use designcraft_doc::cjk::{MojikumiAki, MojikumiTable};
+    let (mut d, sid, _) = doc_with(
+        "ABC",
+        Rect::new(0.0, 0.0, 200.0, 100.0),
+        ParaAttrs { first_line_indent: Some(7.0), mojikumi: Some("MojikumiTable/Indent".into()), ..Default::default() },
+    );
+    Arc::make_mut(&mut d.styles).mojikumi_tables.push(MojikumiTable {
+        name: "Indent".into(),
+        based_on: "SimpChineseDefault".into(),
+        overrides: vec![MojikumiAki {
+            target_class: 18,
+            side_class: 23,
+            after: false,
+            minimum: 2.0,
+            desired: 2.0,
+            maximum: 2.0,
+            ..Default::default()
+        }],
+    });
+    let cs = compose_story(&d, sid, &ComposeOptions::default());
+    let line = all_lines(&cs)[0];
+    assert!((line.glyphs[0].x - 31.0).abs() < 0.001, "{}", line.glyphs[0].x);
+    assert_eq!(line.glyphs.len(), 3);
+}
+
+#[test]
+fn mojikumi_justifies_cjk_without_spaces_and_respects_fixed_spacing() {
+    use designcraft_doc::cjk::{MojikumiAki, MojikumiTable};
+    let (mut d, sid, _) = doc_with(
+        "A1A1",
+        Rect::new(0.0, 0.0, 100.0, 100.0),
+        ParaAttrs { align: Some(Align::FullyJustified), mojikumi: Some("MojikumiTable/Elastic".into()), ..Default::default() },
+    );
+    Arc::make_mut(&mut d.styles).mojikumi_tables.push(MojikumiTable {
+        name: "Elastic".into(),
+        based_on: "SimpChineseDefault".into(),
+        overrides: vec![MojikumiAki {
+            target_class: 18,
+            side_class: 25,
+            after: true,
+            minimum: 0.0,
+            desired: 0.0,
+            maximum: 5.0,
+            priority: 1,
+            ..Default::default()
+        }],
+    });
+    let cs = compose_story(&d, sid, &ComposeOptions::default());
+    assert!((all_lines(&cs)[0].end_x - 100.0).abs() < 0.001, "{}", all_lines(&cs)[0].end_x);
+}
+
+#[test]
+fn mojikumi_fixed_pairs_are_not_stretched_by_single_word_justification() {
+    use designcraft_doc::cjk::{MojikumiAki, MojikumiTable};
+    let (mut d, sid, _) = doc_with(
+        "A1A1",
+        Rect::new(0.0, 0.0, 150.0, 100.0),
+        ParaAttrs { align: Some(Align::FullyJustified), mojikumi: Some("MojikumiTable/Fixed".into()), ..Default::default() },
+    );
+    Arc::make_mut(&mut d.styles).mojikumi_tables.push(MojikumiTable {
+        name: "Fixed".into(),
+        based_on: "SimpChineseDefault".into(),
+        overrides: [(18, 25), (25, 18)]
+            .into_iter()
+            .map(|(target_class, side_class)| MojikumiAki {
+                target_class,
+                side_class,
+                after: true,
+                minimum: 0.25,
+                desired: 0.25,
+                maximum: 0.25,
+                ..Default::default()
+            })
+            .collect(),
+    });
+    let cs = compose_story(&d, sid, &ComposeOptions::default());
+    let line = all_lines(&cs)[0];
+    assert!(line.end_x < 100.0, "Fixed spacing was stretched: {}", line.end_x);
+    d.story_mut(sid).unwrap().paras[0].para.align = Some(Align::Left);
+    let ragged = compose_story(&d, sid, &ComposeOptions::default());
+    assert_eq!(line.end_x, all_lines(&ragged)[0].end_x);
+}
+
+#[test]
+fn mojikumi_kinsoku_push_in_and_push_out_select_different_legal_breaks() {
+    use designcraft_doc::cjk::{MojikumiAki, MojikumiTable};
+    let text = "甲乙丙丁戊己庚辛";
+    let (mut d, sid, _) = doc_with(
+        text,
+        Rect::new(0.0, 0.0, 45.0, 300.0),
+        ParaAttrs {
+            composer: Some(Composer::SingleLine),
+            mojikumi: Some("MojikumiTable/Compress".into()),
+            kinsoku_type: Some("KinsokuPushInFirst".into()),
+            ..Default::default()
+        },
+    );
+    Arc::make_mut(&mut d.styles).mojikumi_tables.push(MojikumiTable {
+        name: "Compress".into(),
+        based_on: "SimpChineseDefault".into(),
+        overrides: vec![MojikumiAki {
+            target_class: 12,
+            side_class: 12,
+            after: true,
+            minimum: 0.0,
+            desired: 1.0,
+            maximum: 1.0,
+            priority: 1,
+            ..Default::default()
+        }],
+    });
+    let inside = compose_story(&d, sid, &ComposeOptions::default());
+    d.story_mut(sid).unwrap().paras[0].para.kinsoku_type = Some("KinsokuPushOutFirst".into());
+    let outside = compose_story(&d, sid, &ComposeOptions::default());
+    assert!(all_lines(&inside)[0].range.end > all_lines(&outside)[0].range.end);
+    for cs in [&inside, &outside] {
+        assert!(all_lines(cs).iter().all(|l| l.end_x <= l.x1 + 0.01));
+    }
+}
+
+#[test]
+fn mojikumi_priority_and_elastic_line_start_are_used_in_placement() {
+    use designcraft_doc::cjk::{MojikumiAki, MojikumiTable};
+    let (mut d, sid, _) = doc_with("A1B2", Rect::new(0.0, 0.0, 45.0, 100.0), ParaAttrs::default());
+    let natural = compose_story(&d, sid, &ComposeOptions::default());
+    let middle_gap = all_lines(&natural)[0].glyphs[2].x - all_lines(&natural)[0].glyphs[1].x;
+    Arc::make_mut(&mut d.styles).mojikumi_tables.push(MojikumiTable {
+        name: "Priority".into(),
+        based_on: "SimpChineseDefault".into(),
+        overrides: vec![
+            MojikumiAki {
+                target_class: 18,
+                side_class: 25,
+                after: true,
+                minimum: 0.0,
+                desired: 0.0,
+                maximum: 10.0,
+                priority: 1,
+                ..Default::default()
+            },
+            MojikumiAki {
+                target_class: 25,
+                side_class: 18,
+                after: true,
+                minimum: 0.0,
+                desired: 0.0,
+                maximum: 10.0,
+                priority: 2,
+                ..Default::default()
+            },
+        ],
+    });
+    let para = &mut d.story_mut(sid).unwrap().paras[0].para;
+    para.mojikumi = Some("MojikumiTable/Priority".into());
+    para.align = Some(Align::FullyJustified);
+    let result = compose_story(&d, sid, &ComposeOptions::default());
+    let line = all_lines(&result)[0];
+    assert!((line.end_x - 45.0).abs() < 0.001);
+    assert!((line.glyphs[2].x - line.glyphs[1].x - middle_gap).abs() < 0.001, "Priority 2 was used before priority 1 was exhausted");
+
+    let (mut d, sid, _) = doc_with(
+        "A",
+        Rect::new(0.0, 0.0, 30.0, 100.0),
+        ParaAttrs { mojikumi: Some("MojikumiTable/Start".into()), align: Some(Align::FullyJustified), ..Default::default() },
+    );
+    Arc::make_mut(&mut d.styles).mojikumi_tables.push(MojikumiTable {
+        name: "Start".into(),
+        based_on: "SimpChineseDefault".into(),
+        overrides: vec![MojikumiAki {
+            target_class: 18,
+            side_class: 23,
+            after: false,
+            minimum: 0.0,
+            desired: 0.0,
+            maximum: 5.0,
+            priority: 1,
+            ..Default::default()
+        }],
+    });
+    let result = compose_story(&d, sid, &ComposeOptions::default());
+    let line = all_lines(&result)[0];
+    assert!((line.end_x - 30.0).abs() < 0.001);
+    assert!(line.glyphs[0].x > 10.0, "Leading gap must move the first outline too");
+}
+
+#[test]
+fn mojikumi_equal_priority_shares_leading_and_internal_space() {
+    use designcraft_doc::cjk::{MojikumiAki, MojikumiTable};
+    let (mut d, sid, _) = doc_with("A1", Rect::new(0.0, 0.0, 40.0, 100.0), ParaAttrs::default());
+    let natural = compose_story(&d, sid, &ComposeOptions::default());
+    let old = all_lines(&natural)[0];
+    let extra = 40.0 - old.end_x;
+    let old_second = old.glyphs[1].x;
+    Arc::make_mut(&mut d.styles).mojikumi_tables.push(MojikumiTable {
+        name: "Shared".into(),
+        based_on: "SimpChineseDefault".into(),
+        overrides: [(18, 23, false), (18, 25, true)]
+            .into_iter()
+            .map(|(target_class, side_class, after)| MojikumiAki {
+                target_class,
+                side_class,
+                after,
+                maximum: 10.0,
+                priority: 1,
+                ..Default::default()
+            })
+            .collect(),
+    });
+    let para = &mut d.story_mut(sid).unwrap().paras[0].para;
+    para.mojikumi = Some("MojikumiTable/Shared".into());
+    para.align = Some(Align::FullyJustified);
+    let result = compose_story(&d, sid, &ComposeOptions::default());
+    let line = all_lines(&result)[0];
+    assert!((line.glyphs[0].x - extra / 2.0).abs() < 0.001);
+    assert!((line.glyphs[1].x - old_second - extra).abs() < 0.001);
+    assert!((line.end_x - 40.0).abs() < 0.001);
+}
+
+#[test]
+fn mojikumi_nonfloating_and_leading_only_compression_fit_ragged_lines() {
+    use designcraft_doc::cjk::{MojikumiAki, MojikumiTable};
+    for composer in [Composer::SingleLine, Composer::Paragraph] {
+        for leading in [true, false] {
+            let (mut d, sid, _) = doc_with(
+                "A",
+                Rect::new(0.0, 0.0, 15.0, 100.0),
+                ParaAttrs { composer: Some(composer), mojikumi: Some("MojikumiTable/Endpoint".into()), ..Default::default() },
+            );
+            Arc::make_mut(&mut d.styles).mojikumi_tables.push(MojikumiTable {
+                name: "Endpoint".into(),
+                based_on: "SimpChineseDefault".into(),
+                overrides: vec![MojikumiAki {
+                    target_class: 18,
+                    side_class: if leading { 23 } else { 22 },
+                    after: !leading,
+                    minimum: 0.0,
+                    desired: 1.0,
+                    maximum: 1.0,
+                    priority: 1,
+                    does_not_float: true,
+                }],
+            });
+            let result = compose_story(&d, sid, &ComposeOptions::default());
+            let line = all_lines(&result)[0];
+            assert!(line.end_x <= 15.0, "{composer:?}, leading={leading}: {}", line.end_x);
+            assert!(line.glyphs[0].x.abs() < 0.001, "Discrete leading gap must reach its endpoint");
+        }
+    }
+}
+
+#[test]
+fn mojikumi_places_custom_gap_after_combining_marks() {
+    use designcraft_doc::cjk::{MojikumiAki, MojikumiTable};
+    let (mut d, sid, _) = doc_with("A\u{0323}\u{0301}1", Rect::new(0.0, 0.0, 200.0, 100.0), ParaAttrs::default());
+    let natural = compose_story(&d, sid, &ComposeOptions::default());
+    let old = &all_lines(&natural)[0].glyphs;
+    assert!(old.len() >= 3, "Exercise a cluster with a separate combining glyph");
+    Arc::make_mut(&mut d.styles).mojikumi_tables.push(MojikumiTable {
+        name: "Clusters".into(),
+        based_on: "SimpChineseDefault".into(),
+        overrides: vec![MojikumiAki {
+            target_class: 18,
+            side_class: 25,
+            after: true,
+            minimum: 1.0,
+            desired: 1.0,
+            maximum: 1.0,
+            ..Default::default()
+        }],
+    });
+    d.story_mut(sid).unwrap().paras[0].para.mojikumi = Some("MojikumiTable/Clusters".into());
+    let result = compose_story(&d, sid, &ComposeOptions::default());
+    let new = &all_lines(&result)[0].glyphs;
+    assert_eq!(new.len(), old.len());
+    for (before, after) in old.iter().zip(new) {
+        let expected = if before.rendered_char == '1' { 12.0 } else { 0.0 };
+        assert!((after.x - before.x - expected).abs() < 0.001, "Glyph {:?} moved incorrectly", before.rendered_char);
+    }
+}
+
+#[test]
+fn mojikumi_does_not_restore_fullwidth_blanks_to_narrow_tracked_punctuation() {
+    let family = "Mojikumi Narrow Body";
+    let font = designcraft_fonts::testing::font_mapping(family, &[('（', 'i'), ('A', 'A')]).unwrap();
+    designcraft_fonts::FontDb::global().add_font(font);
+    let (mut d, sid, _) = doc_with("（A", Rect::new(0.0, 0.0, 200.0, 100.0), ParaAttrs::default());
+    d.story_mut(sid).unwrap().format_chars(0.."（A".len(), |f| {
+        f.over.font_family = Some(family.into());
+        f.over.tracking = Some(1000.0);
+    });
+    let natural = compose_story(&d, sid, &ComposeOptions::default());
+    d.story_mut(sid).unwrap().paras[0].para.mojikumi = Some("SimpChineseDefault".into());
+    let result = compose_story(&d, sid, &ComposeOptions::default());
+    for (a, b) in all_lines(&natural)[0].glyphs.iter().zip(&all_lines(&result)[0].glyphs) {
+        assert!((a.x - b.x).abs() < 0.001);
+        assert!((a.adv - b.adv).abs() < 0.001);
+    }
+}
diff --git a/crates/doc/src/cjk.rs b/crates/doc/src/cjk.rs
index 1ad2221e4..a700ad0c5 100644
--- a/crates/doc/src/cjk.rs
+++ b/crates/doc/src/cjk.rs
@@ -127,8 +127,7 @@ pub enum KinsokuHang {
     Force,
 }
 
-/// Preserved IDML spacing tables. Keeping these separate from the supported
-/// character spacing is essential: a stored table is not an applied rule.
+/// IDML spacing tables resolved by `mojikumi::Rules` for composition and diagnostics.
 #[derive(Clone, Debug, Default, PartialEq, Serialize, Deserialize)]
 #[serde(default, rename_all = "camelCase")]
 pub struct MojikumiTable {
diff --git a/crates/doc/src/lib.rs b/crates/doc/src/lib.rs
index 2a4428dac..937bbbb4f 100644
--- a/crates/doc/src/lib.rs
+++ b/crates/doc/src/lib.rs
@@ -21,6 +21,7 @@ pub mod endnotes;
 pub mod ids;
 pub mod index;
 pub mod item;
+pub mod mojikumi;
 pub mod notes;
 pub mod otf;
 pub mod page;
diff --git a/crates/doc/src/mojikumi.rs b/crates/doc/src/mojikumi.rs
new file mode 100644
index 000000000..fbb8a13df
--- /dev/null
+++ b/crates/doc/src/mojikumi.rs
@@ -0,0 +1,211 @@
+//! Unicode Mojikumi rules shared by composition and preflight.
+//!
+//! IDML class numbers follow the documented Mojikumi override interchange format;
+//! they are not the similarly numbered JLReq classes. Spacing is measured in em.
+use crate::{Styles, cjk::MojikumiAki};
+
+#[derive(Clone, Copy, Debug, Default)]
+pub struct Aki {
+    pub min: f64,
+    pub desired: f64,
+    pub max: f64,
+    pub priority: u8,
+    /// Discrete endpoints rather than a continuously floating amount.
+    pub discrete: bool,
+}
+impl Aki {
+    fn fixed(value: f64) -> Self {
+        Self { min: value, desired: value, max: value, ..Self::default() }
+    }
+}
+
+/// Resolved table; custom rows override the base preset in document order.
+pub struct Rules<'a> {
+    chinese: bool,
+    rows: &'a [MojikumiAki],
+}
+impl<'a> Rules<'a> {
+    pub fn resolve(styles: &'a Styles, name: &str) -> Result<Option<Self>, String> {
+        if matches!(name, "" | "Nothing" | "None") {
+            return Ok(None);
+        }
+        let key = name.strip_prefix("MojikumiTable/").unwrap_or(name);
+        let table = styles.mojikumi_tables.iter().find(|t| t.name == key);
+        let base = table.map_or(key, |t| if t.based_on.is_empty() { t.name.as_str() } else { t.based_on.as_str() });
+        let chinese = match base.trim_start_matches("$ID/") {
+            "SimpChineseDefault" | "TradChineseDefault" => true,
+            "LineEndAllOneHalfEmEnum" | "kMojikumiDefaultName1" => false,
+            _ => return Err(format!("unknown base preset `{base}`")),
+        };
+        let rows = table.map_or(&[][..], |t| t.overrides.as_slice());
+        for r in rows {
+            if !valid_class(r.target_class) || !valid_class(r.side_class) {
+                return Err(format!("unsupported character classes {}/{}", r.target_class, r.side_class));
+            }
+            if ![r.minimum, r.desired, r.maximum].iter().all(|v| v.is_finite() && (-1.0..=100.0).contains(v))
+                || r.minimum > r.desired
+                || r.desired > r.maximum
+                || !(0..=9).contains(&r.priority)
+            {
+                return Err("invalid spacing range or priority".into());
+            }
+        }
+        Ok(Some(Self { chinese, rows }))
+    }
+
+    fn override_pair(&self, left: i16, right: i16) -> Option<&MojikumiAki> {
+        self.rows
+            .iter()
+            .rev()
+            .find(|r| if r.after { r.target_class == left && r.side_class == right } else { r.target_class == right && r.side_class == left })
+    }
+
+    /// Preset spacing restores only blank removed from shaped punctuation bodies.
+    /// Explicit custom rows retain their requested dimensions.
+    pub fn pair_with_bodies(&self, left: i16, right: i16, after_left: f64, before_right: f64) -> Aki {
+        let mut aki = self.pair(left, right);
+        if self.override_pair(left, right).is_none() {
+            let missing = if matches!(left, 22 | 23) {
+                leading(right) - before_right
+            } else if right == 22 {
+                trailing(left) - after_left
+            } else {
+                trailing(left).max(leading(right)) - after_left.max(before_right)
+            }
+            .max(0.0);
+            aki.min = (aki.min - missing).max(0.0);
+            aki.desired = (aki.desired - missing).max(0.0);
+            aki.max = (aki.max - missing).max(0.0);
+        }
+        aki
+    }
+
+    pub fn pair(&self, left: i16, right: i16) -> Aki {
+        if let Some(row) = self.override_pair(left, right) {
+            return Aki {
+                min: row.minimum,
+                desired: row.desired,
+                max: row.maximum,
+                priority: if row.priority == 0 { 10 } else { row.priority as u8 },
+                discrete: row.does_not_float,
+            };
+        }
+        // Boundaries: Chinese keeps full punctuation; the half-em Japanese set
+        // trims opening punctuation at line start and closing punctuation at end.
+        if matches!(left, 22 | 23) {
+            return Aki::fixed(if self.chinese { leading(right) } else { 0.0 });
+        }
+        if right == 22 {
+            return Aki::fixed(if self.chinese { trailing(left) } else { 0.0 });
+        }
+        let punctuation = trailing(left).max(leading(right));
+        if punctuation > 0.0 {
+            return Aki { min: 0.0, desired: punctuation, max: punctuation, priority: 1, discrete: false };
+        }
+        let roman = |c| matches!(c, 18 | 25);
+        let ideograph = |c| matches!(c, 3 | 7..=9 | 11 | 12 | 24 | 33);
+        if (roman(left) && ideograph(right)) || (ideograph(left) && roman(right)) {
+            return Aki { min: 0.0, desired: 0.25, max: 0.5, priority: 3, discrete: false };
+        }
+        if ideograph(left) && ideograph(right) {
+            return Aki { min: 0.0, desired: 0.0, max: 0.25, priority: 10, discrete: false };
+        }
+        Aki::default()
+    }
+}
+
+pub fn valid_class(c: i16) -> bool {
+    matches!(c, 1..=12 | 18 | 21..=33)
+}
+/// Natural half-body blank before a full-width punctuation character.
+pub fn leading(c: i16) -> f64 {
+    match c {
+        1 | 26 | 27 => 0.5,
+        4 | 5 | 32 => 0.25,
+        _ => 0.0,
+    }
+}
+pub fn trailing(c: i16) -> f64 {
+    match c {
+        2 | 6 | 21 | 28..=31 => 0.5,
+        4 | 5 | 32 => 0.25,
+        _ => 0.0,
+    }
+}
+
+/// Unicode classification, independent of font availability and localized names.
+pub fn class(c: char) -> i16 {
+    match c {
+        '「' | '『' | '｢' => 26,
+        '（' => 27,
+        '〈' | '《' | '【' | '〔' | '〖' | '〘' | '［' | '｛' | '‘' | '“' => 1,
+        '」' | '』' | '｣' => 28,
+        '）' => 29,
+        '〉' | '》' | '】' | '〕' | '〗' | '〙' | '］' | '｝' | '’' | '”' => 2,
+        '。' | '｡' => 6,
+        '、' | '､' => 21,
+        '，' => 30,
+        '．' => 31,
+        '：' | '；' => 32,
+        '・' | '·' => 5,
+        '！' | '？' => 4,
+        '…' | '‥' | '—' | '―' => 7,
+        '￥' | '＄' | '£' | '¥' => 8,
+        '％' | '‰' | '℃' | '°' => 9,
+        '\u{3000}' => 10,
+        'ぁ' | 'ぃ' | 'ぅ' | 'ぇ' | 'ぉ' | 'っ' | 'ゃ' | 'ゅ' | 'ょ' | 'ゎ' | 'ァ' | 'ィ' | 'ゥ' | 'ェ' | 'ォ' | 'ッ' | 'ャ' | 'ュ' | 'ョ' | 'ヮ'
+        | 'ー' | '々' | 'ゝ' | 'ゞ' | 'ヽ' | 'ヾ' => 3,
+        '\u{3040}'..='\u{309f}' => 11,
+        '\u{30a0}'..='\u{30ff}' | '\u{31f0}'..='\u{31ff}' => 33,
+        '０'..='９' => 24,
+        '0'..='9' => 25,
+        '\u{2e80}'..='\u{a4cf}' | '\u{ac00}'..='\u{d7af}' | '\u{f900}'..='\u{faff}' | '\u{ff01}'..='\u{ff60}' | '\u{20000}'..='\u{323af}' => 12,
+        _ => 18,
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::cjk::MojikumiTable;
+
+    #[test]
+    fn overrides_are_directional_and_unknown_tables_are_not_silently_applied() {
+        let mut styles = Styles::default();
+        styles.mojikumi_tables.push(MojikumiTable {
+            name: "Pair".into(),
+            based_on: "SimpChineseDefault".into(),
+            overrides: vec![MojikumiAki {
+                target_class: 12,
+                side_class: 18,
+                after: false,
+                minimum: 0.1,
+                desired: 0.2,
+                maximum: 0.3,
+                priority: 2,
+                does_not_float: false,
+            }],
+        });
+        let rule = Rules::resolve(&styles, "MojikumiTable/Pair").unwrap().unwrap();
+        assert_eq!(rule.pair(18, 12).desired, 0.2);
+        assert_eq!(rule.pair(12, 18).desired, 0.25);
+        assert!(Rules::resolve(&styles, "Unknown").is_err());
+        assert!(Rules::resolve(&styles, "Nothing").unwrap().is_none());
+        styles.mojikumi_tables[0].overrides[0].minimum = 0.4;
+        assert!(Rules::resolve(&styles, "MojikumiTable/Pair").is_err());
+    }
+
+    #[test]
+    fn chinese_and_half_em_boundaries_differ_and_classes_cover_punctuation() {
+        let styles = Styles::default();
+        let cn = Rules::resolve(&styles, "SimpChineseDefault").unwrap().unwrap();
+        let jp = Rules::resolve(&styles, "LineEndAllOneHalfEmEnum").unwrap().unwrap();
+        assert_eq!(cn.pair(22, class('（')).desired, 0.5);
+        assert_eq!(jp.pair(22, class('（')).desired, 0.0);
+        assert_eq!(cn.pair(class('。'), 22).desired, 0.5);
+        assert_eq!(jp.pair(class('。'), 22).desired, 0.0);
+        assert_ne!(class('１'), class('1'));
+        assert_ne!(class('，'), class('、'));
+        assert_ne!(class('「'), class('（'));
+    }
+}
diff --git a/crates/engine/src/cmd/fonts.rs b/crates/engine/src/cmd/fonts.rs
index 449e37d75..9a7444ed0 100644
--- a/crates/engine/src/cmd/fonts.rs
+++ b/crates/engine/src/cmd/fonts.rs
@@ -29,7 +29,7 @@ pub fn specs() -> Vec<CommandSpec> {
 }
 
 /// Every story's text, including table cells and footnotes.
-fn for_each_story(d: &Document, f: &mut dyn FnMut(&Story)) {
+pub(super) fn for_each_story(d: &Document, f: &mut dyn FnMut(&Story)) {
     let mut pending: Vec<&Story> = d.stories.values().map(AsRef::as_ref).collect();
     while let Some(st) = pending.pop() {
         f(st);
diff --git a/crates/engine/src/cmd/preflight.rs b/crates/engine/src/cmd/preflight.rs
index 25b9d45fd..5a69ff1bf 100644
--- a/crates/engine/src/cmd/preflight.rs
+++ b/crates/engine/src/cmd/preflight.rs
@@ -138,6 +138,9 @@ pub fn check(s: &Session, min_ppi: f64) -> Vec<Issue> {
                 page: location.and_then(|(_, page)| page),
             });
         }
+    }
+    // Nested note and cell text uses paragraph rules too.
+    super::fonts::for_each_story(d, &mut |story| {
         let ranges = story.para_ranges();
         for (pi, pf) in story.paras.iter().enumerate() {
             let (para, base) = d.styles.resolve_para(pf);
@@ -155,10 +158,13 @@ pub fn check(s: &Session, min_ppi: f64) -> Vec<Issue> {
                         .insert("Paragraph Kashida width preset is preserved; automatic elongation uses the engine's bounded allocation".into());
                 }
             }
-            if !matches!(para.mojikumi.as_str(), "" | "Nothing" | "None") {
-                unsupported_typography.insert(format!("Mojikumi `{}` is preserved, but its spacing table is not applied", para.mojikumi));
+            if let Err(reason) = designcraft_doc::mojikumi::Rules::resolve(&d.styles, &para.mojikumi) {
+                unsupported_typography.insert(format!("Mojikumi `{}` is not applied: {reason}", para.mojikumi));
             }
-            if !para.kinsoku_type.is_empty() {
+            if !matches!(
+                para.kinsoku_type.as_str(),
+                "" | "KinsokuPushInFirst" | "KinsokuPushOutFirst" | "KinsokuPushOutOnly" | "KinsokuPrioritizeAdjustmentAmount"
+            ) {
                 unsupported_typography
                     .insert(format!("Kinsoku priority `{}` is preserved, but push-in/push-out priority is not applied", para.kinsoku_type));
             }
@@ -180,7 +186,7 @@ pub fn check(s: &Session, min_ppi: f64) -> Vec<Issue> {
                 }
             }
         }
-    }
+    });
     // Use the same effective character-to-font mapping as Find Font, including
     // anonymous note/cell stories. Unused composite entries are not missing text.
     for font in super::fonts::used_fonts(d) {
@@ -400,3 +406,25 @@ mod generated_glyph_tests {
         assert_eq!(issue["page"], 0);
     }
 }
+
+#[cfg(test)]
+mod mojikumi_nested_tests {
+    use super::*;
+    use std::sync::Arc;
+    #[test]
+    fn unknown_table_in_a_note_inside_a_cell_is_reported() {
+        let mut s = Session::new();
+        s.execute("file.new", &json!({})).unwrap();
+        s.execute("frame.create", &json!({"rect":[20,20,300,400],"content":"text","text":"Body"})).unwrap();
+        let d = Arc::make_mut(&mut s.doc_mut().unwrap().doc);
+        let sid = *d.stories.keys().next().unwrap();
+        let mut table = designcraft_doc::Table::new(1, 1, 1, 0, 0, 100.0);
+        let cell = &mut table.cells[0].text;
+        let mut pf = designcraft_doc::ParaFormat::default();
+        pf.para.mojikumi = Some("MojikumiTable/Unrecognized".into());
+        cell.insert_note(0, "Note", pf);
+        d.story_mut(sid).unwrap().insert_table(0, table);
+        let issues = check(&s, 150.0);
+        assert_eq!(issues.iter().filter(|i| i.kind == "unsupportedTypography" && i.message.contains("Unrecognized")).count(), 1);
+    }
+}
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index 35e7bbd7e..29287fd65 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -687,3 +687,17 @@ fn preflight_distinguishes_unplaced_stories_and_locates_footnote_overset() {
     assert_eq!(unplaced["severity"], "warning");
     assert!(unplaced.get("page").is_none());
 }
+
+#[test]
+fn preflight_mojikumi_uses_the_same_supported_rules_as_composition() {
+    let mut s = session();
+    s.execute("frame.create", &json!({"rect": [36, 36, 300, 300], "content": "text", "text": "中文 A1"})).unwrap();
+    let story = s.doc().unwrap().doc.stories.keys().next().unwrap().0;
+    s.execute("text.select", &json!({"story": story, "anchor": 0, "focus": 1})).unwrap();
+    for (name, unsupported) in [("SimpChineseDefault", false), ("LineEndAllOneHalfEmEnum", false), ("UnknownPreset", true), ("Nothing", false)] {
+        s.execute("type.para", &json!({"attrs": {"mojikumi": name, "kinsokuType": "KinsokuPushInFirst"}})).unwrap();
+        let result = s.execute("preflight.run", &json!({})).unwrap();
+        let warnings: Vec<_> = result["issues"].as_array().unwrap().iter().filter(|i| i["kind"] == "unsupportedTypography").collect();
+        assert_eq!(!warnings.is_empty(), unsupported, "{name}: {warnings:?}");
+    }
+}
diff --git a/crates/idml/src/import.rs b/crates/idml/src/import.rs
index fb719063e..0bd5de8ac 100644
--- a/crates/idml/src/import.rs
+++ b/crates/idml/src/import.rs
@@ -105,6 +105,7 @@ struct Importer<'r> {
     stroke_styles: Vec<designcraft_doc::StrokeStyleDef>,
     styles: Styles,
     composite_names: HashMap<String, String>,
+    mojikumi_names: HashMap<String, String>,
     kinsoku: HashMap<String, designcraft_doc::cjk::Kinsoku>,
     para_names: HashMap<String, String>,
     char_names: HashMap<String, String>,
@@ -142,6 +143,40 @@ fn lab_to_color(l: f32, a: f32, b: f32) -> Color {
     Color::rgb(rgb[0], rgb[1], rgb[2])
 }
 
+fn mojikumi_row(e: &El) -> Result<designcraft_doc::cjk::MojikumiAki> {
+    let number = |key: &str| -> Result<f64> {
+        let Some(raw) = e.prop(key) else {
+            return Ok(0.0);
+        };
+        raw.trim().parse::<f64>().ok().filter(|v| v.is_finite()).ok_or_else(|| IdmlError::Invalid(format!("Mojikumi row has invalid {key}")))
+    };
+    let integer = |key: &str| -> Result<i16> {
+        let v = number(key)?;
+        if v.fract() != 0.0 || v < f64::from(i16::MIN) || v > f64::from(i16::MAX) {
+            return Err(IdmlError::Invalid(format!("Mojikumi {key} must be an in-range integer")));
+        }
+        Ok(v as i16)
+    };
+    let boolean = |key: &str| -> Result<bool> {
+        match e.prop(key).as_deref().map(str::trim) {
+            None | Some("false") => Ok(false),
+            Some("true") => Ok(true),
+            _ => Err(IdmlError::Invalid(format!("Mojikumi row has invalid {key}"))),
+        }
+    };
+    let row = designcraft_doc::cjk::MojikumiAki {
+        target_class: integer("TargetMojikumiClass")?,
+        side_class: integer("SideMojikumiClass")?,
+        after: boolean("SideIsAfterTarget")?,
+        minimum: number("Minimum")?,
+        desired: number("Desired")?,
+        maximum: number("Maximum")?,
+        priority: integer("CompressionPriority")?,
+        does_not_float: boolean("AkiDoesNotFloat")?,
+    };
+    Ok(row)
+}
+
 fn nums(s: &str) -> Vec<f64> {
     s.split_whitespace().filter_map(|v| v.parse().ok()).collect()
 }
@@ -193,6 +228,7 @@ impl<'r> Importer<'r> {
             stroke_styles: Vec::new(),
             styles,
             composite_names: HashMap::new(),
+            mojikumi_names: HashMap::new(),
             kinsoku: HashMap::new(),
             para_names: HashMap::new(),
             char_names: HashMap::new(),
@@ -314,23 +350,14 @@ impl<'r> Importer<'r> {
             }
         }
         for e in top.iter().filter(|e| e.local() == "MojikumiTable") {
-            let overrides = e
-                .prop_el("OverrideMojikumiAkiList")
-                .map(|l| {
-                    l.find_all("OverrideMojikumiAkiType")
-                        .map(|r| designcraft_doc::cjk::MojikumiAki {
-                            target_class: r.num("TargetMojikumiClass").unwrap_or(0.0) as i16,
-                            side_class: r.num("SideMojikumiClass").unwrap_or(0.0) as i16,
-                            after: r.boolean("SideIsAfterTarget").unwrap_or(false),
-                            minimum: r.num("Minimum").unwrap_or(0.0),
-                            desired: r.num("Desired").unwrap_or(0.0),
-                            maximum: r.num("Maximum").unwrap_or(0.0),
-                            priority: r.num("CompressionPriority").unwrap_or(0.0) as i16,
-                            does_not_float: r.boolean("AkiDoesNotFloat").unwrap_or(false),
-                        })
-                        .collect()
-                })
-                .unwrap_or_default();
+            if let (Some(id), Some(name)) = (e.get("Self"), e.get("Name")) {
+                self.mojikumi_names.insert(id.into(), format!("MojikumiTable/{}", unescape_id(name)));
+            }
+            let overrides = if let Some(list) = e.prop_el("OverrideMojikumiAkiList") {
+                list.find_all("OverrideMojikumiAkiType").map(mojikumi_row).collect::<Result<Vec<_>>>()?
+            } else {
+                Vec::new()
+            };
             self.styles.mojikumi_tables.push(designcraft_doc::cjk::MojikumiTable {
                 name: unescape_id(e.get("Name").unwrap_or("")),
                 based_on: e.get("BasedOnMojikumiSet").unwrap_or("").into(),
@@ -1184,7 +1211,7 @@ impl<'r> Importer<'r> {
             "KinsokuHangForce" => Some(designcraft_doc::cjk::KinsokuHang::Force),
             _ => None,
         });
-        a.mojikumi = e.prop("Mojikumi");
+        a.mojikumi = e.prop("Mojikumi").map(|name| self.mojikumi_names.get(&name).cloned().unwrap_or_else(|| unescape_id(&name)));
         a.kinsoku_type = e.prop("KinsokuType");
         a.bunri_kinshi = e.boolean("BunriKinshi");
         a.rensuuji = e.boolean("Rensuuji");
diff --git a/crates/idml/src/tests.rs b/crates/idml/src/tests.rs
index eddd42e12..4f27e1593 100644
--- a/crates/idml/src/tests.rs
+++ b/crates/idml/src/tests.rs
@@ -1178,12 +1178,11 @@ fn cjk_composite_fonts_and_custom_kinsoku_are_document_resources() {
 }
 
 #[test]
-fn cjk_unsupported_mojikumi_is_preserved_instead_of_silently_dropped() {
-    let map = DESIGNMAP.replace("</Document>", r#"<MojikumiTable Self="MojikumiTable/Spacing" Name="Spacing" BasedOnMojikumiSet="SimpChineseDefault"><Properties><OverrideMojikumiAkiList>
+fn cjk_mojikumi_overrides_and_priority_round_trip() {
+    let map = DESIGNMAP.replace("</Document>", r#"<MojikumiTable Self="uMojikumi1" Name="Spacing" BasedOnMojikumiSet="SimpChineseDefault"><Properties><OverrideMojikumiAkiList>
     <OverrideMojikumiAkiType TargetMojikumiClass="1" SideMojikumiClass="23" SideIsAfterTarget="false" Minimum="-0.1" Desired="0.25" Maximum="0.5" CompressionPriority="3" AkiDoesNotFloat="true"/>
     </OverrideMojikumiAkiList></Properties></MojikumiTable></Document>"#);
-    let story =
-        STORY.replace("<ParagraphStyleRange ", "<ParagraphStyleRange Mojikumi=\"MojikumiTable/Spacing\" KinsokuType=\"KinsokuPushOutFirst\" ");
+    let story = STORY.replace("<ParagraphStyleRange ", "<ParagraphStyleRange Mojikumi=\"uMojikumi1\" KinsokuType=\"KinsokuPushOutFirst\" ");
     let bytes = zip_files(&[
         ("designmap.xml", &map),
         ("Resources/Graphic.xml", GRAPHIC),
@@ -1487,3 +1486,46 @@ fn composite_references_resolve_by_identity_and_export_as_objects() {
     let back = import_idml(&output).unwrap();
     assert_eq!(back.styles.composite_fonts, d.styles.composite_fonts);
 }
+
+#[test]
+fn malformed_mojikumi_rows_are_not_silently_coerced() {
+    let good = r#"<OverrideMojikumiAkiType TargetMojikumiClass="12" SideMojikumiClass="18" SideIsAfterTarget="true" Minimum="0" Desired="0.25" Maximum="0.5" CompressionPriority="3" AkiDoesNotFloat="false"/>"#;
+    for (key, value) in [
+        ("TargetMojikumiClass", "12.9"),
+        ("SideMojikumiClass", "65536"),
+        ("Minimum", "NaN"),
+        ("Desired", "oops"),
+        ("Minimum", "0.4"),
+        ("Maximum", "0.1"),
+        ("Maximum", "101"),
+        ("CompressionPriority", "10"),
+        ("AkiDoesNotFloat", "maybe"),
+    ] {
+        let mut row = crate::xml::parse(good.as_bytes()).unwrap();
+        row.set(key, value);
+        let mut xml = String::new();
+        row.write(&mut xml, 0);
+        let map = DESIGNMAP.replace("</Document>", &format!("<MojikumiTable Name=\"Bad\" BasedOnMojikumiSet=\"SimpChineseDefault\"><Properties><OverrideMojikumiAkiList>{xml}</OverrideMojikumiAkiList></Properties></MojikumiTable></Document>"));
+        let bytes = zip_files(&[
+            ("designmap.xml", &map),
+            ("Resources/Graphic.xml", GRAPHIC),
+            ("Resources/Styles.xml", STYLES),
+            ("Resources/Preferences.xml", PREFS),
+            ("MasterSpreads/MasterSpread_m1.xml", MASTER),
+            ("Spreads/Spread_sp1.xml", SPREAD),
+            ("Stories/Story_s1.xml", STORY),
+        ]);
+        if matches!((key, value), ("Minimum", "0.4") | ("Maximum", "0.1" | "101") | ("CompressionPriority", "10")) {
+            // Finite, representable rules survive import even if composition
+            // cannot apply them. The resolver supplies a diagnostic instead.
+            let document = import_idml(&bytes).unwrap();
+            document.check().unwrap();
+            assert!(designcraft_doc::mojikumi::Rules::resolve(&document.styles, "MojikumiTable/Bad").is_err());
+            let restored = import_idml(&export_idml(&document)).unwrap();
+            assert_eq!(restored.styles.mojikumi_tables, document.styles.mojikumi_tables);
+        } else {
+            let err = import_idml(&bytes).unwrap_err().to_string();
+            assert!(err.contains("Mojikumi"), "{key}={value}: {err}");
+        }
+    }
+}
diff --git a/docs/mojikumi.md b/docs/mojikumi.md
new file mode 100644
index 000000000..fcdf28074
--- /dev/null
+++ b/docs/mojikumi.md
@@ -0,0 +1,18 @@
+# Mojikumi repair scope
+
+The retained changes address reproducible implementation defects: equal-priority
+spacing allocation, discrete compression endpoints, leading-only compression,
+spacing after complete shaped clusters, and tracking that made narrow punctuation
+look full-width. Preflight also checks nested note and table-cell paragraph rules.
+
+IDML import rejects malformed/non-finite numbers and integer coercion. Finite,
+representable rules outside the composer's supported range remain preserved;
+the rule resolver reports unsupported settings instead of rejecting the document.
+
+The broad preset expansion, regional side-bearing changes, Tsume combination
+policy, and CID preference/diagnostic extension were withdrawn after review.
+The original supported preset set and Unicode classification remain in place.
+No claim of full Adobe Mojikumi conformance or exact output parity is made.
+
+Reference for priority semantics:
+[Adobe spacing priorities](https://helpx.adobe.com/indesign/desktop/language-and-proofing/chinese-japanese-and-korean/set-spacing-priorities-in-mojikumi-character-classes.html).