diff --git a/solitaire_core/src/game_state.rs b/solitaire_core/src/game_state.rs
index bd624c7..f5d8ee8 100644
--- a/solitaire_core/src/game_state.rs
+++ b/solitaire_core/src/game_state.rs
@@ -1,7 +1,6 @@
 use crate::error::MoveError;
 use crate::klondike_adapter::{
     DrawMode, KlondikeAdapter, SavedInstruction,
-    compute_time_bonus as scoring_time_bonus,
     foundation_from_slot as adapter_foundation_from_slot,
     skip_cards_from_count as adapter_skip_cards_from_count,
     tableau_from_index as adapter_tableau_from_index,
@@ -1118,11 +1117,6 @@ impl GameState {
             })
     }
 
-    /// Time bonus added to score on win: `700_000 / elapsed_seconds` (0 if elapsed is 0).
-    pub fn compute_time_bonus(&self) -> i32 {
-        scoring_time_bonus(self.elapsed_seconds)
-    }
-
     /// Read-only access to the underlying [`card_game::Session`] for this deal.
     ///
     /// Exposes `session.history()` (deterministic replay) and `session.solve()`
diff --git a/solitaire_data/src/lib.rs b/solitaire_data/src/lib.rs
index fc02b3d..d453ae1 100644
--- a/solitaire_data/src/lib.rs
+++ b/solitaire_data/src/lib.rs
@@ -124,8 +124,8 @@ pub use achievements::{
 
 pub mod progress;
 pub use progress::{
-    PlayerProgress, daily_seed_for, level_for_xp, load_progress_from, progress_file_path,
-    save_progress_to, xp_for_win,
+    PlayerProgress, XpBreakdown, daily_seed_for, level_for_xp, load_progress_from,
+    progress_file_path, save_progress_to, xp_breakdown, xp_for_win,
 };
 
 pub mod weekly;
@@ -172,8 +172,11 @@ pub use replay::{
     ReplayHistory, ReplayMove, append_replay_to_history, load_replay_history_from,
     migrate_legacy_latest_replay, replay_history_path, save_replay_history_to,
 };
+// `latest_replay_path` is still consumed by the engine's one-shot legacy
+// migration; `load_latest_replay_from`/`save_latest_replay_to` had no callers
+// outside `replay.rs` and were dropped from the public surface.
 #[allow(deprecated)]
-pub use replay::{latest_replay_path, load_latest_replay_from, save_latest_replay_to};
+pub use replay::latest_replay_path;
 
 #[cfg(not(target_arch = "wasm32"))]
 pub mod matomo_client;
diff --git a/solitaire_data/src/progress.rs b/solitaire_data/src/progress.rs
index d1c60df..e082fd1 100644
--- a/solitaire_data/src/progress.rs
+++ b/solitaire_data/src/progress.rs
@@ -25,12 +25,34 @@ pub fn daily_seed_for(date: NaiveDate) -> u64 {
     y * 10_000 + m * 100 + d
 }
 
-/// XP awarded for winning a game.
+/// Component breakdown of the XP awarded for a win.
+///
+/// This is the single source of truth for win-XP scoring: [`xp_for_win`] sums
+/// it for the total, and UI that displays the individual lines (the win-summary
+/// modal) reads the parts from here so the breakdown can never drift from the
+/// total.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct XpBreakdown {
+    /// Flat base XP granted for any win.
+    pub base: u64,
+    /// Scaled fast-win bonus (10..=50 for sub-2-minute wins, else 0).
+    pub speed_bonus: u64,
+    /// Bonus for winning without using undo (25, else 0).
+    pub no_undo_bonus: u64,
+}
+
+impl XpBreakdown {
+    /// Total XP awarded: `base + speed_bonus + no_undo_bonus`.
+    pub fn total(self) -> u64 {
+        self.base + self.speed_bonus + self.no_undo_bonus
+    }
+}
+
+/// Component breakdown of the XP awarded for a win.
 ///
 /// Base 50 + scaled fast-win bonus (10..=50 for sub-2-minute wins) + 25 if
 /// the player did not use undo.
-pub fn xp_for_win(time_seconds: u64, used_undo: bool) -> u64 {
-    let base: u64 = 50;
+pub fn xp_breakdown(time_seconds: u64, used_undo: bool) -> XpBreakdown {
     let speed_bonus: u64 = if time_seconds >= 120 {
         0
     } else {
@@ -39,8 +61,16 @@ pub fn xp_for_win(time_seconds: u64, used_undo: bool) -> u64 {
         let scaled = 50_u64.saturating_sub(time_seconds.saturating_mul(40) / 120);
         scaled.max(10)
     };
-    let no_undo_bonus: u64 = if used_undo { 0 } else { 25 };
-    base + speed_bonus + no_undo_bonus
+    XpBreakdown {
+        base: 50,
+        speed_bonus,
+        no_undo_bonus: if used_undo { 0 } else { 25 },
+    }
+}
+
+/// XP awarded for winning a game. See [`xp_breakdown`] for the components.
+pub fn xp_for_win(time_seconds: u64, used_undo: bool) -> u64 {
+    xp_breakdown(time_seconds, used_undo).total()
 }
 
 /// Platform-specific default path for `progress.json`.
diff --git a/solitaire_engine/src/feedback_anim_plugin.rs b/solitaire_engine/src/feedback_anim_plugin.rs
index 452b398..3e38495 100644
--- a/solitaire_engine/src/feedback_anim_plugin.rs
+++ b/solitaire_engine/src/feedback_anim_plugin.rs
@@ -44,7 +44,8 @@ use std::hash::{Hash, Hasher};
 use bevy::prelude::*;
 use bevy::window::RequestRedraw;
 use solitaire_core::card::Card;
-use solitaire_core::{Foundation, KlondikePile};
+use solitaire_core::KlondikePile;
+use solitaire_core::klondike_adapter::foundation_from_slot;
 use solitaire_data::AnimSpeed;
 
 use crate::animation_plugin::CardAnim;
@@ -645,16 +646,6 @@ fn pile_cards(
     }
 }
 
-fn foundation_from_slot(slot: u8) -> Option<Foundation> {
-    match slot {
-        0 => Some(Foundation::Foundation1),
-        1 => Some(Foundation::Foundation2),
-        2 => Some(Foundation::Foundation3),
-        3 => Some(Foundation::Foundation4),
-        _ => None,
-    }
-}
-
 // ---------------------------------------------------------------------------
 // Unit tests (pure functions only — no Bevy world required)
 // ---------------------------------------------------------------------------
diff --git a/solitaire_engine/src/win_summary_plugin.rs b/solitaire_engine/src/win_summary_plugin.rs
index d62ba08..ac3940a 100644
--- a/solitaire_engine/src/win_summary_plugin.rs
+++ b/solitaire_engine/src/win_summary_plugin.rs
@@ -90,28 +90,23 @@ pub struct WinSummaryPending {
 
 /// Builds a human-readable XP breakdown string for the win modal.
 ///
-/// Mirrors the logic in `solitaire_data::xp_for_win` so the breakdown always
-/// matches the total shown on the `XpAwardedEvent`.
+/// Reads the components from `solitaire_data::xp_breakdown` — the single source
+/// of truth shared with `xp_for_win` — so the breakdown can never drift from
+/// the total shown on the `XpAwardedEvent`.
 ///
 /// Examples:
 /// - slow win, no undo  → `"+50 base  +25 no-undo"`
 /// - fast win, undo     → `"+50 base  +30 speed"`
 /// - fast win, no undo  → `"+50 base  +25 no-undo  +30 speed"`
 fn build_xp_detail(time_seconds: u64, used_undo: bool) -> String {
-    let speed_bonus: u64 = if time_seconds >= 120 {
-        0
-    } else {
-        let scaled = 50_u64.saturating_sub(time_seconds.saturating_mul(40) / 120);
-        scaled.max(10)
-    };
-    let no_undo_bonus: u64 = if used_undo { 0 } else { 25 };
+    let xp = solitaire_data::xp_breakdown(time_seconds, used_undo);
 
-    let mut parts = vec!["+50 base".to_string()];
-    if no_undo_bonus > 0 {
-        parts.push("+25 no-undo".to_string());
+    let mut parts = vec![format!("+{} base", xp.base)];
+    if xp.no_undo_bonus > 0 {
+        parts.push(format!("+{} no-undo", xp.no_undo_bonus));
     }
-    if speed_bonus > 0 {
-        parts.push(format!("+{speed_bonus} speed"));
+    if xp.speed_bonus > 0 {
+        parts.push(format!("+{} speed", xp.speed_bonus));
     }
     parts.join("  ")
 }