diff --git a/remicon_cost_app.html b/remicon_cost_app.html
index 202cffe..667217d 100644
--- a/remicon_cost_app.html
+++ b/remicon_cost_app.html
@@ -192,6 +192,20 @@
     }
     .mix-compare-body { padding: 14px; max-height: 76vh; overflow: auto; }
     #mixCompareChart { width: 100%; height: 300px; display: block; }
+    .chart-tooltip {
+      position: fixed;
+      z-index: 9999;
+      pointer-events: none;
+      background: rgba(15, 23, 42, 0.95);
+      color: #fff;
+      font-size: 12px;
+      line-height: 1.35;
+      padding: 6px 8px;
+      border-radius: 8px;
+      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.22);
+      white-space: nowrap;
+      display: none;
+    }
     .mini-table { border-collapse: collapse; font-size: 12px; }
     .mini-table td { border: none; padding: 2px 6px; white-space: nowrap; text-align: center; }
     .combined-wrap { display: flex; align-items: flex-start; gap: 10px; }
@@ -267,7 +281,7 @@
 
     .modal.open { display: flex; }
     .modal-card { width: min(920px, 100%); background: #fff; border-radius: 14px; overflow: hidden; border: 1px solid var(--line); }
-    .modal-head { background: #0f172a; color: #fff; padding: 12px 14px; display: flex; justify-content: space-between; align-items: center; }
+    .modal-head { background: #0f172YT; color: #fff; padding: 12px 14px; display: flex; justify-content: space-between; align-items: center; }
     .modal-body { padding: 14px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
     .modal-foot { padding: 12px 14px; border-top: 1px solid var(--line); display: flex; gap: 8px; justify-content: flex-end; }
     .price-modal-body { padding: 14px; display: grid; grid-template-columns: 1fr; gap: 10px; }
@@ -532,6 +546,8 @@
     const MIX_DRAFT_KEY = "remicon_mix_draft_v1";
     const PRICE_DRAFT_KEY = "remicon_price_draft_v1";
     const CUSTOM_SPECS_KEY = "remicon_custom_specs_v1";
+    const EMBEDDED_DATA_REV_KEY = "remicon_embedded_data_rev_v1";
+    const EMBEDDED_DATA_REV = "2026-03-03-fixed-v1";
     const PRESET_SPECS = [
       "25-27-600",
       "25-30-600",
@@ -659,6 +675,8 @@
     const statusRow = document.getElementById("statusRow");
     const compareBaseSelect = document.getElementById("compareBaseSelect");
     const compareTargetSelect = document.getElementById("compareTargetSelect");
+    const chartHoverHandlers = new WeakMap();
+    let chartTooltipEl = null;
 
     const PRICE_COMPARE_FIELDS = [
       { key: "cement", label: "시멘트 단가" },
@@ -940,6 +958,17 @@
     }
 
     function seedDefaultDataIfEmpty() {
+      const savedRev = localStorage.getItem(EMBEDDED_DATA_REV_KEY);
+      const mustApplyEmbedded = savedRev !== EMBEDDED_DATA_REV;
+      if (mustApplyEmbedded) {
+        saveJsonArray(PRICE_SETS_KEY, DEFAULT_PRICE_SETS);
+        saveJsonArray(MIX_HISTORY_KEY, DEFAULT_MIX_HISTORY);
+        localStorage.setItem(SELECTED_PRICE_SET_KEY, "ps_2026_02");
+        localStorage.setItem(CUSTOM_SPECS_KEY, JSON.stringify([]));
+        localStorage.setItem(EMBEDDED_DATA_REV_KEY, EMBEDDED_DATA_REV);
+        return;
+      }
+
       const hasPriceSets = loadJsonArray(PRICE_SETS_KEY).length > 0;
       const hasMixHistory = loadJsonArray(MIX_HISTORY_KEY).length > 0;
       if (!hasPriceSets) saveJsonArray(PRICE_SETS_KEY, DEFAULT_PRICE_SETS);
@@ -2016,6 +2045,65 @@
       return Number.isInteger(rounded) ? rounded.toLocaleString("ko-KR") : rounded.toLocaleString("ko-KR", { minimumFractionDigits: 2, maximumFractionDigits: 2 });
     }
 
+    function fmtInt(n) {
+      return Math.round(toNum(n)).toLocaleString("ko-KR");
+    }
+
+    function getChartTooltip() {
+      if (chartTooltipEl && document.body.contains(chartTooltipEl)) return chartTooltipEl;
+      chartTooltipEl = document.createElement("div");
+      chartTooltipEl.className = "chart-tooltip";
+      document.body.appendChild(chartTooltipEl);
+      return chartTooltipEl;
+    }
+
+    function hideChartTooltip() {
+      const tip = getChartTooltip();
+      tip.style.display = "none";
+    }
+
+    function showChartTooltip(clientX, clientY, text) {
+      const tip = getChartTooltip();
+      tip.textContent = text;
+      tip.style.display = "block";
+      const offset = 12;
+      tip.style.left = `${clientX + offset}px`;
+      tip.style.top = `${clientY + offset}px`;
+    }
+
+    function bindCanvasHover(canvas, hitAreas) {
+      if (!canvas) return;
+      const prev = chartHoverHandlers.get(canvas);
+      if (prev) {
+        canvas.removeEventListener("mousemove", prev.move);
+        canvas.removeEventListener("mouseleave", prev.leave);
+      }
+
+      const move = (e) => {
+        const rect = canvas.getBoundingClientRect();
+        const x = e.clientX - rect.left;
+        const y = e.clientY - rect.top;
+        const hit = hitAreas.find((h) => x >= h.x && x <= h.x + h.w && y >= h.y && y <= h.y + h.h);
+        if (!hit) {
+          hideChartTooltip();
+          return;
+        }
+        showChartTooltip(e.clientX, e.clientY, `${fmtInt(hit.value)}`);
+      };
+      const leave = () => hideChartTooltip();
+      canvas.addEventListener("mousemove", move);
+      canvas.addEventListener("mouseleave", leave);
+      chartHoverHandlers.set(canvas, { move, leave });
+    }
+
+    function priceSetOrderValue(set) {
+      if (!set) return 0;
+      const y = toNum(set.year);
+      const m = toNum(set.month);
+      if (y > 0 && m > 0) return y * 100 + m;
+      return new Date(set.createdAt || 0).getTime();
+    }
+
     function drawPriceCompareChart(canvas, base, target) {
       if (!canvas || !base || !target) return;
       const dpr = window.devicePixelRatio || 1;
@@ -2039,6 +2127,7 @@
       const maxVal = Math.max(1, ...baseVals, ...targetVals);
       const groupW = plotW / keys.length;
       const barW = Math.max(10, Math.min(22, groupW * 0.28));
+      const hitAreas = [];
 
       ctx.strokeStyle = "#d1d5db";
       ctx.lineWidth = 1;
@@ -2054,7 +2143,7 @@
       for (let i = 0; i <= 4; i += 1) {
         const v = (maxVal * i) / 4;
         const y = padding.top + plotH - (plotH * i) / 4;
-        ctx.fillText(fmt(v), padding.left - 6, y + 3);
+         ctx.fillText(fmtInt(v), padding.left - 6, y + 3);
         ctx.strokeStyle = "#eef2f7";
         ctx.beginPath();
         ctx.moveTo(padding.left, y);
@@ -2075,6 +2164,8 @@
         ctx.fillRect(baseX, baseY, barW, baseH);
         ctx.fillStyle = "#0f766e";
         ctx.fillRect(targetX, targetY, barW, targetH);
+        hitAreas.push({ x: baseX, y: baseY, w: barW, h: baseH, label: labels[i], value: baseVals[i], series: "기준" });
+        hitAreas.push({ x: targetX, y: targetY, w: barW, h: targetH, label: labels[i], value: targetVals[i], series: "비교" });
 
         ctx.fillStyle = "#1f2937";
         ctx.textAlign = "center";
@@ -2090,6 +2181,7 @@
       ctx.fillRect(padding.left + 54, cssHeight - 18, 10, 10);
       ctx.fillStyle = "#1f2937";
       ctx.fillText("비교", padding.left + 68, cssHeight - 9);
+      bindCanvasHover(canvas, hitAreas);
     }
 
     function drawMixCostCompareChart(canvas, labels, datasets) {
@@ -2115,6 +2207,7 @@
       const slotW = Math.max(8, Math.min(20, groupW / (datasets.length + 1)));
       const usedW = slotW * datasets.length;
       const startShift = usedW / 2;
+      const hitAreas = [];
 
       ctx.strokeStyle = "#d1d5db";
       ctx.beginPath();
@@ -2129,7 +2222,7 @@
       for (let i = 0; i <= 4; i += 1) {
         const v = (maxVal * i) / 4;
         const y = padding.top + plotH - (plotH * i) / 4;
-        ctx.fillText(fmt(v), padding.left - 6, y + 3);
+         ctx.fillText(fmtInt(v), padding.left - 6, y + 3);
         ctx.strokeStyle = "#eef2f7";
         ctx.beginPath();
         ctx.moveTo(padding.left, y);
@@ -2146,6 +2239,7 @@
           const y = padding.top + plotH - h;
           ctx.fillStyle = colors[di % colors.length];
           ctx.fillRect(x, y, slotW - 2, h);
+          hitAreas.push({ x, y, w: slotW - 2, h, label, value: v, series: ds.name });
         });
         ctx.fillStyle = "#1f2937";
         ctx.textAlign = "center";
@@ -2170,10 +2264,13 @@
         ctx.fillText(name, lx + 14, ly);
         lx += 150;
       });
+      bindCanvasHover(canvas, hitAreas);
     }
 
     function openMixComparePopup(spec) {
-      const rows = mixHistory.filter((x) => x.spec === spec && selectedMixCompareIds.has(x.id));
+      const rows = mixHistory
+        .filter((x) => x.spec === spec && selectedMixCompareIds.has(x.id))
+        .sort((a, b) => new Date(a.createdAt) - new Date(b.createdAt));
       if (rows.length === 0) {
         alert("비교할 배합을 먼저 체크하세요.");
         return;
@@ -2206,12 +2303,21 @@
       prepared.forEach((p) => {
         html += `<th>${p.name}</th>`;
       });
+      html += "<th>증.감비용</th>";
       html += "</tr></thead><tbody>";
       itemLabels.forEach((item, idx) => {
         html += `<tr><td>${item}</td>`;
         prepared.forEach((p) => {
           html += `<td>${Math.round(toNum(p.values[idx])).toLocaleString("ko-KR")}</td>`;
         });
+        let diffCost = 0;
+        if (prepared.length >= 2) {
+          const firstVal = toNum(prepared[0].values[idx]);
+          const lastVal = toNum(prepared[prepared.length - 1].values[idx]);
+          diffCost = Math.round(lastVal - firstVal);
+        }
+        const diffText = `${diffCost >= 0 ? "+" : ""}${diffCost.toLocaleString("ko-KR")}`;
+        html += `<td>${diffText}</td>`;
         html += "</tr>";
       });
       html += "</tbody></table>";
@@ -2241,26 +2347,41 @@
         return;
       }
 
-      priceSets.forEach((set, idx) => {
+      priceSets.forEach((set) => {
         const label = priceSetLabel(set);
         const o1 = document.createElement("option");
         o1.value = set.id;
         o1.textContent = label;
-        if (idx === 1) o1.selected = true;
         compareBaseSelect.appendChild(o1);
 
         const o2 = document.createElement("option");
         o2.value = set.id;
         o2.textContent = label;
-        if (idx === 0) o2.selected = true;
         compareTargetSelect.appendChild(o2);
       });
 
+      const byDateAsc = [...priceSets].sort((a, b) => priceSetOrderValue(a) - priceSetOrderValue(b));
+      compareBaseSelect.value = byDateAsc[0].id;
+      compareTargetSelect.value = byDateAsc[byDateAsc.length - 1].id;
+
       renderPriceComparison();
     }
 
+    function normalizePriceCompareOrder() {
+      const base = priceSets.find((x) => x.id === compareBaseSelect.value);
+      const target = priceSets.find((x) => x.id === compareTargetSelect.value);
+      if (!base || !target || base.id === target.id) return;
+      const baseTs = priceSetOrderValue(base);
+      const targetTs = priceSetOrderValue(target);
+      if (baseTs > targetTs) {
+        compareBaseSelect.value = target.id;
+        compareTargetSelect.value = base.id;
+      }
+    }
+
     function renderPriceComparison() {
       const area = document.getElementById("priceCompareArea");
+      normalizePriceCompareOrder();
       const base = priceSets.find((x) => x.id === compareBaseSelect.value);
       const target = priceSets.find((x) => x.id === compareTargetSelect.value);