diff --git a/client/css/style.css b/client/css/style.css
index 4c2c04e..f83f529 100644
--- a/client/css/style.css
+++ b/client/css/style.css
@@ -1362,6 +1362,24 @@ input:focus, select:focus { border-color: var(--accent); }
   box-shadow: 0 6px 18px rgba(0, 0, 0, 0.6);
 }
 
+/* A resource chip's tooltip: production above consumption, each row
+   right-aligned. One grid holds both rows so the sign and figure columns line
+   up; the figure column reserves the width of the largest pool figure
+   (99 999 999 999), so the bubble never shifts as a stock moves. */
+.resource-tip {
+  display: grid;
+  grid-template-columns: auto auto auto;
+  justify-content: end;
+  column-gap: 0.35em;
+  row-gap: 2px;
+  font-variant-numeric: tabular-nums;
+}
+.resource-tip .rt-sign { text-align: right; font-weight: 700; }
+.resource-tip .rt-figure { text-align: right; min-width: 14ch; }
+.resource-tip .rt-tail { text-align: left; }
+.resource-tip .rt-sign.produce, .resource-tip .rt-figure.produce { color: #6ee787; }
+.resource-tip .rt-sign.consume, .resource-tip .rt-figure.consume { color: #f27272; }
+
 /* Right-click menu for the units sharing a tile. */
 .stack-menu {
   position: absolute;
diff --git a/client/js/devlog_data.js b/client/js/devlog_data.js
index 087b370..166b95d 100644
--- a/client/js/devlog_data.js
+++ b/client/js/devlog_data.js
@@ -1,6 +1,12 @@
 // Generated by scripts/generate-devlog.js from `git log`; do not edit.
 // The pre-commit hook refreshes it so the main menu shows the latest commits.
 export const DEVLOG = [
+  {
+    "hash": "0a1c2d0",
+    "date": "2026-09-25",
+    "subject": "Guaranteed the 45-second starter build even on an unpowered map",
+    "body": ""
+  },
   {
     "hash": "80d2e22",
     "date": "2026-09-25",
@@ -54,11 +60,5 @@ export const DEVLOG = [
     "date": "2026-09-24",
     "subject": "Grouped the unit stack by type and let ranged units pick a target",
     "body": ""
-  },
-  {
-    "hash": "1c6f0ae",
-    "date": "2026-09-24",
-    "subject": "Cut the per-broadcast and per-frame cost on a full-sized map",
-    "body": "The server sent the whole army on every snapshot and the client re-cloned\nthe whole icon layer whenever a unit moved, so a settled world with a\nstanding army drained the broadcast loop and the frame loop alike.\n\n- Ship only the units and city list that changed, keyed by a per-peer\n  fingerprint and a serialised hash, and merge those deltas on the client.\n- Memoise the battlefield scan on a battle version bumped when a unit\n  joins, leaves or changes side.\n- Skip the DOM writes for units whose snapshot object is unchanged, and\n  cache the unit-view inner nodes.\n- Fold units, cities and tile markers onto the nearest world copy instead\n  of mirroring the icon layers, which re-cloned thousands of views every\n  frame; the small decoration layers still mirror, and only on a change.\n\nFrame work at full zoom-out with units moving fell from ~190ms to ~6.5ms."
   }
 ];
diff --git a/client/js/game_screen/panels.js b/client/js/game_screen/panels.js
index 29b2dcc..b8dddcc 100644
--- a/client/js/game_screen/panels.js
+++ b/client/js/game_screen/panels.js
@@ -163,11 +163,13 @@ export const panelMethods = {
   },
 
   // A small hover tooltip anchored above a stat, fed by its data-tooltip text.
+  // A top-panel resource chip is the exception: its tooltip is a two-line bill,
+  // production above consumption, both right-aligned.
   _showStatTooltip($stat) {
-    const text = $stat.attr("data-tooltip");
-    if (!text) return;
+    const content = this._statTooltipContent($stat);
+    if (content === null) return;
     this._hoveredStat = $stat;
-    this.$statTooltip.text(text).removeClass("hidden");
+    this.$statTooltip.empty().append(content).removeClass("hidden");
     const offset = $stat.offset() || { left: 0, top: 0 };
     const width = this.$statTooltip.outerWidth() || 0;
     const height = this.$statTooltip.outerHeight() || 0;
@@ -177,6 +179,50 @@ export const panelMethods = {
     });
   },
 
+  // The body of a stat tooltip: the resource bill for a pool chip, or the plain
+  // text another stat carries. Null means the stat has no tooltip.
+  _statTooltipContent($stat) {
+    if ($stat.hasClass("top-resource")) {
+      const proto = resourceById($stat.attr("data-resource"));
+      const unit = proto ? proto.unit : "";
+      return this._resourceTooltip(
+        Number($stat.attr("data-produced")) || 0,
+        Number($stat.attr("data-consumed")) || 0,
+        unit
+      );
+    }
+    const text = $stat.attr("data-tooltip");
+    return text ? document.createTextNode(text) : null;
+  },
+
+  // A resource's daily flows as two right-aligned rows: production first with a
+  // plus, consumption second with a minus. One grid holds both rows, so the sign
+  // and figure columns line up; the figure column reserves room for the largest
+  // pool figure (99 999 999 999), so the bubble never shifts width as a stock
+  // moves.
+  _resourceTooltip(produced, consumed, unit) {
+    const $tip = $("<div class='resource-tip'></div>");
+    for (const row of [
+      { cls: "produce", sign: "+", amount: produced },
+      { cls: "consume", sign: "−", amount: consumed },
+    ]) {
+      $tip.append(
+        $("<span class='rt-sign'></span>").addClass(row.cls).text(row.sign),
+        $("<span class='rt-figure'></span>").addClass(row.cls).text(groupDigits(row.amount)),
+        $("<span class='rt-tail'></span>").addClass(row.cls).text(`${unit}/day`)
+      );
+    }
+    return $tip;
+  },
+
+  // Rebuilds the open stat tooltip in place, so a snapshot that changes the
+  // figures under the pointer does not leave a stale bubble.
+  _refreshStatTooltip() {
+    if (!this._hoveredStat || this.$statTooltip.hasClass("hidden")) return;
+    const content = this._statTooltipContent(this._hoveredStat);
+    if (content !== null) this.$statTooltip.empty().append(content);
+  },
+
   _hideStatTooltip() {
     this._hoveredStat = null;
     this.$statTooltip.addClass("hidden");
@@ -917,11 +963,9 @@ export const panelMethods = {
       if (Math.abs(net) <= 0.5) $arrow.text("=").addClass("equal");
       else $arrow.text(net > 0 ? "▲" : "▼").addClass(net > 0 ? "up" : "down");
       $value.after($arrow);
-      $chip.attr(
-        "data-tooltip",
-        `Produced ${formatResourceAmount(id, made)}/day   ·   ` +
-          `Consumed ${formatResourceAmount(id, used)}/day`
-      );
+      // The hover tooltip pairs the two flows; the raw figures ride on the chip
+      // so an open tooltip can be rebuilt in step with the next snapshot.
+      $chip.attr("data-produced", made).attr("data-consumed", used);
     }
   },
 
@@ -976,10 +1020,7 @@ export const panelMethods = {
       0.005
     );
     // Keep an open stat tooltip in step with the figures it describes.
-    if (this._hoveredStat && !this.$statTooltip.hasClass("hidden")) {
-      const text = this._hoveredStat.attr("data-tooltip");
-      if (text) this.$statTooltip.text(text);
-    }
+    this._refreshStatTooltip();
   },
 
   // Appends the month-on-month change marker inside a stat's value: a bold
@@ -1366,8 +1407,7 @@ export const panelMethods = {
       .attr("data-tooltip", parts.join(", "));
     // Keep an open tooltip in step with the unit it describes across snapshots.
     if (this._hoveredStat && !this.$statTooltip.hasClass("hidden")) {
-      const text = this._hoveredStat.attr("data-tooltip");
-      if (text) this.$statTooltip.text(text);
+      this._refreshStatTooltip();
     } else {
       this._hideStatTooltip();
     }
diff --git a/tests/simple_ui_test.js b/tests/simple_ui_test.js
index b269619..b3c963f 100644
--- a/tests/simple_ui_test.js
+++ b/tests/simple_ui_test.js
@@ -253,7 +253,14 @@ export class SimpleUiTest extends TestCase {
   async test_the_top_panel_shows_the_pool_in_simple_mode() {
     const env = await setupDom();
     try {
-      const screen = { economyModel: "simple", _updateTopResources: panelMethods._updateTopResources };
+      const screen = {
+        economyModel: "simple",
+        _updateTopResources: panelMethods._updateTopResources,
+        _showStatTooltip: panelMethods._showStatTooltip,
+        _statTooltipContent: panelMethods._statTooltipContent,
+        _resourceTooltip: panelMethods._resourceTooltip,
+        $statTooltip: env.$("#stat-tooltip"),
+      };
       screen._updateTopResources({
         resources: {
           stock: { steel: 1_000_000, food: 500_000, luxury: 500_000, hightech: 20_000 },
@@ -276,15 +283,22 @@ export class SimpleUiTest extends TestCase {
       // less than it eats, so it is draining.
       this.assertTrue(chips.eq(0).find(".stat-arrow").hasClass("up"), "a growing pool arrow up");
       this.assertTrue(chips.eq(1).find(".stat-arrow").hasClass("down"), "a draining pool arrow down");
-      const tooltip = chips.eq(0).attr("data-tooltip");
-      this.assertTrue(
-        tooltip.includes(`Produced ${formatResourceAmount("steel", 1_500)}/day`),
-        "the tooltip names production"
-      );
-      this.assertTrue(
-        tooltip.includes(`Consumed ${formatResourceAmount("steel", 1_000)}/day`),
-        "the tooltip names consumption"
-      );
+      // The chip's tooltip is a two-line bill: production with a plus, then
+      // consumption with a minus, each with its figure and unit.
+      screen._showStatTooltip(chips.eq(0));
+      const tip = env.$("#stat-tooltip .resource-tip");
+      const signs = tip.find(".rt-sign");
+      const figures = tip.find(".rt-figure");
+      const tails = tip.find(".rt-tail");
+      this.assertSize(signs, 2, "production and consumption");
+      this.assertTrue(signs.eq(0).hasClass("produce"), "production leads");
+      this.assertEqual(signs.eq(0).text(), "+");
+      this.assertEqual(figures.eq(0).text(), groupDigits(1_500));
+      this.assertEqual(tails.eq(0).text(), "t/day");
+      this.assertTrue(signs.eq(1).hasClass("consume"), "consumption follows");
+      this.assertEqual(signs.eq(1).text(), "−");
+      this.assertEqual(figures.eq(1).text(), groupDigits(1_000));
+      this.assertEqual(tails.eq(1).text(), "t/day");
     } finally {
       teardownDom(env);
     }