diff --git a/remicon_cost_app.html b/remicon_cost_app.html
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+<!doctype html>
+<html lang="ko">
+<head>
+  <meta charset="UTF-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1" />
+  <title>레미콘 배합/단가 통합 관리</title>
+  <style>
+    @import url('https://fonts.googleapis.com/css2?family=Pretendard:wght@400;600;700;800&display=swap');
+
+    :root {
+      --bg: #f1f5f9;
+      --card: #ffffff;
+      --text: #334155;
+      --muted: #64748b;
+      --line: #e2e8f0;
+      --primary: #1e40af;
+      --primary-hover: #1d4ed8;
+      --header: #ffffff;
+      --danger: #b91c1c;
+    }
+
+    * { box-sizing: border-box; }
+    body {
+      margin: 0;
+      padding: 22px;
+      font-family: "Pretendard", -apple-system, BlinkMacSystemFont, system-ui, "Segoe UI", "Noto Sans KR", sans-serif;
+      color: var(--text);
+      background: var(--bg);
+    }
+
+    .wrap { max-width: 1460px; margin: 0 auto; display: grid; gap: 14px; }
+    .card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; box-shadow: 0 2px 10px rgba(15, 23, 42, 0.05); overflow: hidden; }
+
+    .top {
+      background: rgba(255, 255, 255, 0.95);
+      color: #0f172a;
+      padding: 16px 18px;
+      display: flex;
+      flex-wrap: wrap;
+      align-items: center;
+      justify-content: space-between;
+      gap: 12px;
+      border-bottom: 1px solid var(--line);
+      backdrop-filter: blur(8px);
+    }
+
+    .top h1 { margin: 0; font-size: 20px; }
+    .top p { margin: 5px 0 0; color: #64748b; font-size: 13px; }
+
+    .nav { display: flex; gap: 8px; flex-wrap: wrap; }
+    .content { padding: 16px; display: grid; gap: 12px; }
+    .row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
+    .grid2 { display: grid; grid-template-columns: 1fr; gap: 12px; }
+    .panel { border: 1px solid var(--line); border-radius: 12px; overflow: hidden; background: #fff; }
+    .panel h2 { margin: 0; padding: 11px 12px; font-size: 16px; border-bottom: 1px solid var(--line); background: #f8fafc; color: #334155; font-weight: 700; }
+
+    .page { display: none; }
+    .page.active { display: block; }
+
+    .tag { background: #f8fafc; color: #475569; border: 1px solid #e2e8f0; border-radius: 999px; padding: 2px 8px; font-size: 12px; display: inline-block; }
+    .empty { color: var(--muted); font-size: 13px; padding: 12px; }
+
+    .field { display: flex; flex-direction: column; gap: 5px; }
+    .field label { font-size: 12px; color: var(--muted); }
+
+    .form-grid { padding: 16px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
+    .full { grid-column: 1 / -1; }
+
+    table { width: 100%; border-collapse: collapse; font-size: 13px; }
+    th, td { border-bottom: 1px solid #e2e8f0; padding: 10px 9px; text-align: left; vertical-align: middle; }
+    th { background: #f8fafc; color: #475569; font-weight: 700; }
+    #historyArea { overflow-x: auto; }
+    .history-table { width: 100%; table-layout: auto; }
+    .history-table th, .history-table td {
+      white-space: nowrap;
+      line-height: 1.35;
+      padding: 6px 8px;
+    }
+    .history-table th {
+      text-align: center;
+      vertical-align: middle;
+    }
+    .history-table td {
+      text-align: center;
+      vertical-align: middle;
+    }
+    .history-table tbody tr {
+      height: 34px;
+    }
+    .history-table .kind-cell {
+      text-align: center;
+      vertical-align: middle;
+      font-weight: 600;
+      min-width: 52px;
+      padding: 0 8px;
+      line-height: 1;
+    }
+    .history-table .kind-cell .kind-label {
+      display: block;
+      height: 100%;
+      line-height: 1.2;
+    }
+    .history-table th:first-child,
+    .history-table td:first-child {
+      width: 48px;
+      min-width: 48px;
+      padding-left: 14px;
+      padding-right: 6px;
+    }
+    .history-table td[rowspan] {
+      vertical-align: middle;
+    }
+    .history-table .prod-cell,
+    .history-table .manage-cell {
+      vertical-align: middle;
+      text-align: center;
+      padding-top: 0;
+      padding-bottom: 0;
+    }
+    .history-table .action-cell {
+      display: flex;
+      gap: 4px;
+      align-items: center;
+      justify-content: center;
+      text-align: center;
+      vertical-align: middle;
+    }
+    .history-table .action-cell button {
+      height: 28px;
+      padding: 0 8px;
+      font-size: 12px;
+      border-radius: 8px;
+    }
+    .manage-wrap { display: grid; gap: 6px; justify-items: center; }
+    .pick-row { font-size: 12px; color: #334155; display: flex; gap: 4px; align-items: center; justify-content: center; }
+    .pick-row input[type="checkbox"] {
+      width: 13px;
+      height: 13px;
+      transform: scale(0.95);
+      margin: 0;
+    }
+    .history-tools { display: flex; align-items: center; gap: 8px; margin: 0 0 8px; }
+    .history-tools .count { font-size: 12px; color: #475569; }
+    .history-tools .sub {
+      height: 30px;
+      padding: 0 10px;
+      font-size: 12px;
+      border-radius: 8px;
+    }
+    .line-less-table th,
+    .line-less-table td {
+      border-bottom: none;
+    }
+    .spec-table th,
+    .spec-table td {
+      text-align: center;
+      vertical-align: middle;
+    }
+    .spec-table .kind-cell {
+      font-weight: 600;
+      white-space: nowrap;
+      min-width: 52px;
+      padding: 0 8px;
+    }
+    .spec-table .kind-cell .kind-label {
+      display: block;
+      height: 32px;
+      line-height: 32px;
+    }
+    .spec-table th:first-child,
+    .spec-table td:first-child {
+      padding-left: 16px;
+      padding-right: 10px;
+    }
+    .compare-chart-wrap {
+      margin-top: 10px;
+      padding: 10px;
+      border: 1px solid var(--line);
+      border-radius: 10px;
+      background: #fff;
+    }
+    .compare-chart-title {
+      font-size: 13px;
+      color: #334155;
+      margin-bottom: 6px;
+      font-weight: 600;
+    }
+    #priceCompareChart {
+      width: 100%;
+      height: 260px;
+      display: block;
+    }
+    .mix-compare-body { padding: 14px; max-height: 76vh; overflow: auto; }
+    #mixCompareChart { width: 100%; height: 300px; display: block; }
+    .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; }
+    .combined-meta { min-width: 180px; font-size: 12px; color: #334155; text-align: left; line-height: 1.5; }
+    .combined-meta strong { color: #0f172a; }
+
+    input, select {
+      height: 38px;
+      border: 1px solid var(--line);
+      border-radius: 10px;
+      padding: 0 10px;
+      font-size: 14px;
+      min-width: 120px;
+    }
+
+    button { height: 38px; border: none; border-radius: 10px; padding: 0 12px; font-size: 14px; cursor: pointer; }
+    .primary { background: var(--primary); color: #fff; }
+    .primary:hover { background: var(--primary-hover); }
+    .sub { background: #f1f5f9; color: #0f172a; border: 1px solid #cbd5e1; }
+    .danger { background: #fee2e2; color: var(--danger); }
+    #mainPage .content .row:first-child label { font-size: 13px; }
+    #mainPage .content .row:first-child select {
+      height: 34px;
+      min-width: 170px;
+      font-size: 13px;
+      border-radius: 9px;
+    }
+    #mainPage .content .row:first-child button {
+      height: 34px;
+      font-size: 13px;
+      padding: 0 10px;
+      border-radius: 9px;
+    }
+    #pricePage .content .row label { font-size: 13px; }
+    #pricePage .content .row select {
+      height: 34px;
+      min-width: 170px;
+      font-size: 13px;
+      border-radius: 9px;
+    }
+    #pricePage .content .row button {
+      height: 34px;
+      font-size: 13px;
+      padding: 0 10px;
+      border-radius: 9px;
+    }
+    #pricePage table th:first-child,
+    #pricePage table td:first-child {
+      padding-left: 22px;
+    }
+
+    .spec-btn {
+      border: 0;
+      background: #ecfeff;
+      color: #155e75;
+      padding: 4px 8px;
+      border-radius: 8px;
+      cursor: pointer;
+      font-size: 12px;
+      height: auto;
+    }
+
+    .modal {
+      position: fixed;
+      inset: 0;
+      background: rgba(15, 23, 42, 0.45);
+      display: none;
+      align-items: center;
+      justify-content: center;
+      padding: 16px;
+      z-index: 10;
+    }
+
+    .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-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; }
+    .price-modal-body .field input { width: 100%; }
+    .pair-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
+    .pair-grid input { width: 100%; }
+    .calc-body { padding: 14px; max-height: 70vh; overflow: auto; }
+    .calc-body table { font-size: 12px; }
+    .calc-body td, .calc-body th { white-space: normal; }
+    #calcModal .modal-head { padding: 10px 12px; }
+    #calcModal .modal-head strong { font-size: 16px; }
+    #calcModal .calc-body { font-size: 12px; }
+
+      @media (max-width: 960px) {
+      .form-grid { grid-template-columns: 1fr 1fr; }
+      .modal-body { grid-template-columns: 1fr 1fr; }
+    }
+
+    @media (max-width: 640px) {
+      .form-grid, .modal-body { grid-template-columns: 1fr; }
+    }
+  </style>
+</head>
+<body>
+  <div class="wrap">
+    <div class="card top">
+      <div>
+        <h1>레미콘 배합/단가 통합 관리</h1>
+        <p>자재 7종 고정: 시멘트, 고로슬래그, 세척사, 부순모래, 25mm, 20mm, 혼화제</p>
+      </div>
+      <div class="nav">
+        <button class="primary" id="goMainBtn">메인 (배합 이력)</button>
+        <button class="sub" id="goPriceBtn">단가 데이터 관리</button>
+      </div>
+    </div>
+
+    <div id="mainPage" class="page active">
+      <div class="card content">
+        <div class="row">
+          <label for="priceSetSelect">적용 단가</label>
+          <select id="priceSetSelect"></select>
+          <button class="sub" id="refreshBtn">새로고침</button>
+          <button class="primary" id="newMixBtn">배합표 등록 (팝업)</button>
+        </div>
+        <div class="row" id="statusRow"></div>
+      </div>
+
+      <div class="grid2">
+        <section class="panel">
+          <h2>규격 목록 (최신 배합)</h2>
+          <div id="specListArea"></div>
+        </section>
+        <section class="panel">
+          <h2>선택 규격 배합 이력</h2>
+          <div id="historyArea" class="empty">규격을 클릭하면 이력이 표시됩니다.</div>
+        </section>
+      </div>
+    </div>
+
+    <div id="pricePage" class="page">
+      <section class="card">
+        <div class="content">
+          <div class="row">
+            <button class="primary" id="openPriceModalBtn">단가 입력 (팝업)</button>
+          </div>
+        </div>
+      </section>
+
+      <section class="card">
+        <div id="priceListArea"></div>
+      </section>
+
+      <section class="card">
+        <div class="content">
+          <div class="row">
+            <label for="compareBaseSelect">기준 단가</label>
+            <select id="compareBaseSelect"></select>
+            <label for="compareTargetSelect">비교 단가</label>
+            <select id="compareTargetSelect"></select>
+            <button class="sub" id="swapCompareBtn">기준/비교 바꾸기</button>
+          </div>
+          <div id="priceCompareArea" class="empty">비교할 단가를 선택하세요.</div>
+        </div>
+      </section>
+    </div>
+  </div>
+
+  <div class="modal" id="mixModal">
+    <div class="modal-card">
+      <div class="modal-head">
+        <strong id="mixModalTitle">배합표 등록</strong>
+        <button class="sub" id="closeModalBtn">닫기</button>
+      </div>
+      <div class="modal-body">
+        <div class="field full">
+          <label for="mSpec">규격명</label>
+          <input id="mSpec" placeholder="예: 25-24-150" />
+        </div>
+        <div class="field full">
+          <label for="mPriceSetId">적용 단가</label>
+          <select id="mPriceSetId"></select>
+        </div>
+
+        <div class="field">
+          <label for="mWaterCementRatio">물시멘트비 (W/B)%</label>
+          <input id="mWaterCementRatio" type="number" min="0" step="0.01" />
+        </div>
+        <div class="field">
+          <label for="mFineAggRatio">잔골재율 (S/a)%</label>
+          <input id="mFineAggRatio" type="number" min="0" step="0.01" />
+        </div>
+        <div class="field">
+          <label for="mWater">물 (W)kg</label>
+          <input id="mWater" type="number" min="0" step="0.01" />
+        </div>
+
+        <div class="field">
+          <label for="mCement">시멘트 (C1)kg</label>
+          <input id="mCement" type="number" min="0" step="0.01" />
+        </div>
+        <div class="field">
+          <label for="mSlag">고로슬래그 (C2)kg</label>
+          <input id="mSlag" type="number" min="0" step="0.01" />
+        </div>
+
+        <div class="field">
+          <label for="mWashedSand">세척사 (S1)kg</label>
+          <input id="mWashedSand" type="number" min="0" step="0.01" />
+        </div>
+        <div class="field">
+          <label for="mCrushedSand">부순모래 (S2)kg</label>
+          <input id="mCrushedSand" type="number" min="0" step="0.01" />
+        </div>
+
+        <div class="field">
+          <label for="mMm25">골재 25mm (G1)kg</label>
+          <input id="mMm25" type="number" min="0" step="0.01" />
+        </div>
+        <div class="field">
+          <label for="mMm20">골재 20mm (G2)kg</label>
+          <input id="mMm20" type="number" min="0" step="0.01" />
+        </div>
+
+        <div class="field">
+          <label for="mAdmixture">혼화제 (AD)kg</label>
+          <input id="mAdmixture" type="number" min="0" step="0.01" />
+        </div>
+
+        <div class="field full">
+          <label for="mNote">변경 사유/메모 (선택)</label>
+          <input id="mNote" placeholder="예: 골재 수급 변경 반영" />
+        </div>
+      </div>
+      <div class="modal-foot">
+        <button class="sub" id="cancelBtn">취소</button>
+        <button class="primary" id="saveMixBtn">저장</button>
+      </div>
+    </div>
+  </div>
+
+  <div class="modal" id="priceModal">
+    <div class="modal-card">
+      <div class="modal-head">
+        <strong id="priceModalTitle">단가 데이터 입력</strong>
+        <button class="sub" id="closePriceModalBtn">닫기</button>
+      </div>
+      <div class="price-modal-body">
+        <div class="field">
+          <label for="pYear">단가인상 년</label>
+          <input id="pYear" type="number" min="2000" max="2100" placeholder="예: 2026" />
+        </div>
+        <div class="field">
+          <label for="pMonth">단가인상 월</label>
+          <input id="pMonth" type="number" min="1" max="12" placeholder="예: 2" />
+        </div>
+        <div class="field">
+          <label for="pCementPrice">시멘트 단가(ton/원)</label>
+          <input id="pCementPrice" type="number" min="0" step="0.01" />
+        </div>
+        <div class="field">
+          <label for="pSlagPrice">슬래그 단가(ton/원)</label>
+          <input id="pSlagPrice" type="number" min="0" step="0.01" />
+        </div>
+        <div class="field">
+          <label>세척사 단가입력 - 단위중량</label>
+          <div class="pair-grid">
+            <input id="pWashedSandPrice" type="number" min="0" step="0.01" placeholder="단가(m3/원)" />
+            <input id="pWashedSandDensity" type="number" min="1" step="1" placeholder="단위중량" />
+          </div>
+        </div>
+        <div class="field">
+          <label>부순모래 단가입력 - 단위중량</label>
+          <div class="pair-grid">
+            <input id="pCrushedSandPrice" type="number" min="0" step="0.01" placeholder="단가(m3/원)" />
+            <input id="pCrushedSandDensity" type="number" min="1" step="1" placeholder="단위중량" />
+          </div>
+        </div>
+        <div class="field">
+          <label>25mm 단가입력 - 단위중량</label>
+          <div class="pair-grid">
+            <input id="pMm25Price" type="number" min="0" step="0.01" placeholder="단가(m3/원)" />
+            <input id="pMm25Density" type="number" min="1" step="1" placeholder="단위중량" />
+          </div>
+        </div>
+        <div class="field">
+          <label>20mm 단가입력 - 단위중량</label>
+          <div class="pair-grid">
+            <input id="pMm20Price" type="number" min="0" step="0.01" placeholder="단가(m3/원)" />
+            <input id="pMm20Density" type="number" min="1" step="1" placeholder="단위중량" />
+          </div>
+        </div>
+        <div class="field">
+          <label for="pAdmixturePrice">혼화제 단가(kg/원)</label>
+          <input id="pAdmixturePrice" type="number" min="0" step="0.01" />
+        </div>
+      </div>
+      <div class="modal-foot">
+        <button class="sub" id="clearPriceBtn">입력 초기화</button>
+        <button class="primary" id="savePriceBtn">단가 저장</button>
+      </div>
+    </div>
+  </div>
+
+  <div class="modal" id="calcModal">
+    <div class="modal-card">
+      <div class="modal-head">
+        <strong>계산 상세 확인</strong>
+        <button class="sub" id="closeCalcModalBtn">닫기</button>
+      </div>
+      <div class="calc-body" id="calcDetailBody"></div>
+    </div>
+  </div>
+
+  <div class="modal" id="mixCompareModal">
+    <div class="modal-card" style="width:min(1200px,100%);">
+      <div class="modal-head">
+        <strong>선택 배합 금액 비교</strong>
+        <button class="sub" id="closeMixCompareModalBtn">닫기</button>
+      </div>
+      <div class="mix-compare-body" id="mixCompareBody"></div>
+    </div>
+  </div>
+
+  <script>
+    const MATERIALS = [
+      { key: "cement", label: "시멘트 (C1)kg", short: "시멘트 (C1)kg" },
+      { key: "slag", label: "고로슬래그 (C2)kg", short: "고로슬래그 (C2)kg" },
+      { key: "washedSand", label: "세척사 (S1)kg", short: "세척사 (S1)kg" },
+      { key: "crushedSand", label: "부순모래 (S2)kg", short: "부순모래 (S2)kg" },
+      { key: "mm25", label: "골재 25mm (G1)kg", short: "골재 25mm (G1)kg" },
+      { key: "mm20", label: "골재 20mm (G2)kg", short: "골재 20mm (G2)kg" },
+      { key: "admixture", label: "혼화제 (AD)kg", short: "혼화제 (AD)kg" }
+    ];
+
+    const PRICE_SETS_KEY = "remicon_price_sets_v1";
+    const MIX_HISTORY_KEY = "remicon_mix_history_v1";
+    const SELECTED_PRICE_SET_KEY = "remicon_selected_price_set_v1";
+    const MIX_DRAFT_KEY = "remicon_mix_draft_v1";
+    const PRICE_DRAFT_KEY = "remicon_price_draft_v1";
+
+    const DEFAULT_PRICE_SETS = [
+      {
+        id: "ps_2025_01",
+        year: 2025,
+        month: 1,
+        name: "2025년 1월 단가인상",
+        prices: {
+          cement: 112000,
+          slag: 73000,
+          washedSand: 28000,
+          crushedSand: 20900,
+          mm25: 18400,
+          mm20: 21500,
+          admixture: 1200,
+          washedSandDensity: 1600,
+          crushedSandDensity: 1600,
+          mm25Density: 2300,
+          mm20Density: 2300,
+          cementAdj: 1,
+          slagAdj: 1,
+          washedSandAdj: 1,
+          crushedSandAdj: 1,
+          mm20Adj: 1,
+          mm25Adj: 1,
+          admixtureAdj: 1
+        },
+        createdAt: "2026-02-27T11:34:40+09:00"
+      },
+      {
+        id: "ps_2026_02",
+        year: 2026,
+        month: 2,
+        name: "2026년 2월 단가인상",
+        prices: {
+          cement: 112000,
+          slag: 73000,
+          washedSand: 32000,
+          crushedSand: 20900,
+          mm25: 18400,
+          mm20: 21500,
+          admixture: 1200,
+          washedSandDensity: 1600,
+          crushedSandDensity: 1600,
+          mm25Density: 2300,
+          mm20Density: 2300,
+          cementAdj: 1,
+          slagAdj: 1,
+          washedSandAdj: 1,
+          crushedSandAdj: 1,
+          mm20Adj: 1,
+          mm25Adj: 1,
+          admixtureAdj: 1
+        },
+        createdAt: "2026-02-26T10:09:54+09:00"
+      }
+    ];
+
+    const DEFAULT_MIX_HISTORY = [
+      {
+        id: "mix_25_27_600_2026",
+        spec: "25-27-600",
+        mixMeta: { waterCementRatio: 46, fineAggRatio: 48.5, water: 170 },
+        materials: { cement: 277, slag: 92, washedSand: 501, crushedSand: 338, mm25: 901, mm20: 0, admixture: 3.32 },
+        priceSetId: "ps_2026_02",
+        note: "",
+        createdAt: "2026-02-26T10:50:24+09:00",
+        updatedAt: "2026-02-26T10:50:24+09:00"
+      },
+      {
+        id: "mix_25_30_600_2026",
+        spec: "25-30-600",
+        mixMeta: { waterCementRatio: 42, fineAggRatio: 46.5, water: 170 },
+        materials: { cement: 304, slag: 101, washedSand: 472, crushedSand: 319, mm25: 920, mm20: 0, admixture: 3.36 },
+        priceSetId: "ps_2026_02",
+        note: "",
+        createdAt: "2026-02-27T11:40:07+09:00",
+        updatedAt: "2026-02-27T11:40:07+09:00"
+      },
+      {
+        id: "mix_25_35_600_2025",
+        spec: "25-35-600",
+        mixMeta: { waterCementRatio: 38, fineAggRatio: 45.5, water: 170 },
+        materials: { cement: 314, slag: 134, washedSand: 452, crushedSand: 305, mm25: 917, mm20: 0, admixture: 4.02 },
+        priceSetId: "ps_2025_01",
+        note: "",
+        createdAt: "2026-02-27T11:40:41+09:00",
+        updatedAt: "2026-02-27T11:40:41+09:00"
+      }
+    ];
+
+    let priceSets = [];
+    let mixHistory = [];
+    let selectedSpec = "";
+    let editingMixId = null;
+    let editingPriceId = null;
+    let selectedMixCompareIds = new Set();
+    let densitySnapshot = {
+      washedSand: 1600,
+      crushedSand: 1600,
+      mm20: 1500,
+      mm25: 1500
+    };
+
+    const mixModal = document.getElementById("mixModal");
+    const priceModal = document.getElementById("priceModal");
+    const calcModal = document.getElementById("calcModal");
+    const mixCompareModal = document.getElementById("mixCompareModal");
+    const calcDetailBody = document.getElementById("calcDetailBody");
+    const mixCompareBody = document.getElementById("mixCompareBody");
+    const mixModalTitle = document.getElementById("mixModalTitle");
+    const priceModalTitle = document.getElementById("priceModalTitle");
+    const saveMixBtn = document.getElementById("saveMixBtn");
+    const savePriceBtnEl = document.getElementById("savePriceBtn");
+    const priceSetSelect = document.getElementById("priceSetSelect");
+    const statusRow = document.getElementById("statusRow");
+    const compareBaseSelect = document.getElementById("compareBaseSelect");
+    const compareTargetSelect = document.getElementById("compareTargetSelect");
+
+    const PRICE_COMPARE_FIELDS = [
+      { key: "cement", label: "시멘트 단가" },
+      { key: "slag", label: "고로슬래그 단가" },
+      { key: "washedSand", label: "세척사 단가" },
+      { key: "crushedSand", label: "부순모래 단가" },
+      { key: "mm25", label: "골재 25mm 단가" },
+      { key: "mm20", label: "골재 20mm 단가" },
+      { key: "admixture", label: "혼화제 단가" }
+    ];
+
+    function toNum(v) {
+      const n = Number(String(v ?? "").replace(/,/g, "").trim());
+      return Number.isFinite(n) ? n : 0;
+    }
+
+    function loadJsonArray(key) {
+      const raw = localStorage.getItem(key);
+      if (!raw) return [];
+      try {
+        const parsed = JSON.parse(raw);
+        return Array.isArray(parsed) ? parsed : [];
+      } catch (error) {
+        return [];
+      }
+    }
+
+    function saveJsonArray(key, value) {
+      localStorage.setItem(key, JSON.stringify(value));
+    }
+
+    function saveDraft(key, value) {
+      localStorage.setItem(key, JSON.stringify(value));
+    }
+
+    function loadDraft(key) {
+      const raw = localStorage.getItem(key);
+      if (!raw) return null;
+      try {
+        return JSON.parse(raw);
+      } catch (error) {
+        return null;
+      }
+    }
+
+    function formatDateTime(iso) {
+      if (!iso) return "-";
+      const d = new Date(iso);
+      if (Number.isNaN(d.getTime())) return "-";
+      return d.toLocaleString("ko-KR");
+    }
+
+    function formatDateOnly(iso) {
+      if (!iso) return "-";
+      const d = new Date(iso);
+      if (Number.isNaN(d.getTime())) return "-";
+      const y = d.getFullYear();
+      const m = d.getMonth() + 1;
+      const day = d.getDate();
+      return `${y}. ${m}. ${day}.`;
+    }
+
+    function priceSetLabel(set) {
+      if (!set) return "단가 미지정";
+      return `${set.year}년 ${set.month}월 단가인상`;
+    }
+
+    function getPriceSetMap() {
+      const map = new Map();
+      priceSets.forEach((p) => map.set(p.id, p));
+      return map;
+    }
+
+    function formatMaterials(materials) {
+      return MATERIALS.map((m) => `${m.short}:${toNum(materials[m.key])}`).join(" / ");
+    }
+
+    function formatPriceSetTableHTML(prices) {
+      const p = prices || {};
+      const cells = [
+        ["시멘트<br>(C1)kg", toNum(p.cement)],
+        ["고로슬래그<br>(C2)kg", toNum(p.slag)],
+        ["세척사<br>(S1)kg", toNum(p.washedSand)],
+        ["부순모래<br>(S2)kg", toNum(p.crushedSand)],
+        ["골재 25mm<br>(G1)kg", toNum(p.mm25)],
+        ["골재 20mm<br>(G2)kg", toNum(p.mm20)],
+        ["혼화제<br>(AD)kg", toNum(p.admixture)]
+      ];
+      let html = '<table class="mini-table"><tr><td></td>';
+      cells.forEach(([k]) => {
+        html += `<td>${k}</td>`;
+      });
+      html += '</tr><tr><td>단가</td>';
+      cells.forEach(([, v]) => {
+        html += `<td>${fmt(v)}</td>`;
+      });
+      html += '</tr></table>';
+      return html;
+    }
+
+    function formatMixFront(meta) {
+      if (!meta) return "-";
+      const wc = toNum(meta.waterCementRatio);
+      const fa = toNum(meta.fineAggRatio);
+      const water = toNum(meta.water);
+      return `물시멘트비 (W/B)%:${wc} / 잔골재율 (S/a)%:${fa} / 물 (W)kg:${water}`;
+    }
+
+    function formatMixDisplay(entry) {
+      return `${formatMixFront(entry.mixMeta)} | ${formatMaterials(entry.materials || {})}`;
+    }
+
+    function formatMixTableHTML(entry) {
+      const meta = entry.mixMeta || {};
+      const mat = entry.materials || {};
+      const cells = [
+        ["물시멘트비<br>(W/B)%", toNum(meta.waterCementRatio)],
+        ["잔골재율<br>(S/a)%", toNum(meta.fineAggRatio)],
+        ["물<br>(W)kg", toNum(meta.water)],
+        ["시멘트<br>(C1)kg", toNum(mat.cement)],
+        ["고로슬래그<br>(C2)kg", toNum(mat.slag)],
+        ["세척사<br>(S1)kg", toNum(mat.washedSand)],
+        ["부순모래<br>(S2)kg", toNum(mat.crushedSand)],
+        ["골재 25mm<br>(G1)kg", toNum(mat.mm25)],
+        ["골재 20mm<br>(G2)kg", toNum(mat.mm20)],
+        ["혼화제<br>(AD)kg", toNum(mat.admixture)]
+      ];
+      let html = '<table class="mini-table"><tr>';
+      cells.forEach(([k, v]) => {
+        html += `<td>${k}</td>`;
+      });
+      html += "</tr><tr>";
+      cells.forEach(([, v]) => {
+        html += `<td>${v}</td>`;
+      });
+      html += "</tr></table>";
+      return html;
+    }
+
+    function calcMaterialCosts(mat, prices) {
+      const wsDensity = toNum(prices.washedSandDensity) || 1600;
+      const csDensity = toNum(prices.crushedSandDensity) || 1600;
+      const mm20Density = toNum(prices.mm20Density) || 1500;
+      const mm25Density = toNum(prices.mm25Density) || 1500;
+      return {
+        cement: (toNum(mat.cement) / 1000) * toNum(prices.cement),
+        slag: (toNum(mat.slag) / 1000) * toNum(prices.slag),
+        // For m3-based items, convert kg to m3 using unit weight (kg/m3).
+        washedSand: (toNum(mat.washedSand) / wsDensity) * toNum(prices.washedSand),
+        crushedSand: (toNum(mat.crushedSand) / csDensity) * toNum(prices.crushedSand),
+        mm20: (toNum(mat.mm20) / mm20Density) * toNum(prices.mm20),
+        mm25: (toNum(mat.mm25) / mm25Density) * toNum(prices.mm25),
+        admixture: toNum(mat.admixture) * toNum(prices.admixture)
+      };
+    }
+
+    function sumProductionCosts(costs) {
+      // Production unit cost is the sum of all 7 material costs.
+      return (
+        toNum(costs.cement) +
+        toNum(costs.slag) +
+        toNum(costs.washedSand) +
+        toNum(costs.crushedSand) +
+        toNum(costs.mm20) +
+        toNum(costs.mm25) +
+        toNum(costs.admixture)
+      );
+    }
+
+    function formatCostBreakdown(costs) {
+      const items = [
+        { label: "시멘트", value: toNum(costs.cement) },
+        { label: "고로슬래그", value: toNum(costs.slag) },
+        { label: "세척사", value: toNum(costs.washedSand) },
+        { label: "부순모래", value: toNum(costs.crushedSand) },
+        { label: "골재 25mm", value: toNum(costs.mm25) },
+        { label: "골재 20mm", value: toNum(costs.mm20) },
+        { label: "혼화제", value: toNum(costs.admixture) }
+      ];
+      const visible = items.filter((x) => Math.round(x.value) !== 0);
+      return visible.map((x) => `${x.label}:${Math.round(x.value).toLocaleString("ko-KR")}`).join(" / ");
+    }
+
+    function formatCostTableHTML(costs) {
+      if (!costs) return "-";
+      const items = [
+        ["시멘트", toNum(costs.cement)],
+        ["고로슬래그", toNum(costs.slag)],
+        ["세척사", toNum(costs.washedSand)],
+        ["부순모래", toNum(costs.crushedSand)],
+        ["골재 25mm", toNum(costs.mm25)],
+        ["골재 20mm", toNum(costs.mm20)],
+        ["혼화제", toNum(costs.admixture)]
+      ].filter(([, v]) => Math.round(v) !== 0);
+      let html = '<table class="mini-table"><tr>';
+      items.forEach(([k]) => {
+        html += `<td>${k}</td>`;
+      });
+      html += "</tr><tr>";
+      items.forEach(([, v]) => {
+        html += `<td>${Math.round(v).toLocaleString("ko-KR")}</td>`;
+      });
+      html += "</tr></table>";
+      return html;
+    }
+
+    function formatCombinedMixCostTableHTML(entry, costs, prices, setText) {
+      const meta = entry.mixMeta || {};
+      const mat = entry.materials || {};
+      const unit = prices || {};
+      const cells = [
+        ["물시멘트비<br>(W/B)%", toNum(meta.waterCementRatio), null, null],
+        ["잔골재율<br>(S/a)%", toNum(meta.fineAggRatio), null, null],
+        ["물<br>(W)kg", toNum(meta.water), null, null],
+        ["시멘트<br>(C1)kg", toNum(mat.cement), toNum(costs?.cement), toNum(unit.cement)],
+        ["고로슬래그<br>(C2)kg", toNum(mat.slag), toNum(costs?.slag), toNum(unit.slag)],
+        ["세척사<br>(S1)kg", toNum(mat.washedSand), toNum(costs?.washedSand), toNum(unit.washedSand)],
+        ["부순모래<br>(S2)kg", toNum(mat.crushedSand), toNum(costs?.crushedSand), toNum(unit.crushedSand)],
+        ["골재 25mm<br>(G1)kg", toNum(mat.mm25), toNum(costs?.mm25), toNum(unit.mm25)],
+        ["골재 20mm<br>(G2)kg", toNum(mat.mm20), toNum(costs?.mm20), toNum(unit.mm20)],
+        ["혼화제<br>(AD)kg", toNum(mat.admixture), toNum(costs?.admixture), toNum(unit.admixture)]
+      ];
+
+      let html = '<div class="combined-wrap">';
+      html += `<div class="combined-meta"><div><strong>등록일</strong> ${formatDateOnly(entry.createdAt)}</div><div><strong>적용단가</strong> ${setText}</div></div>`;
+      html += '<table class="mini-table"><tr><td></td>';
+      cells.forEach(([k]) => {
+        html += `<td>${k}</td>`;
+      });
+      html += '</tr><tr><td>배합</td>';
+      cells.forEach(([, mixVal]) => {
+        html += `<td>${mixVal}</td>`;
+      });
+      html += '</tr><tr><td>단가</td>';
+      cells.forEach(([, , , unitVal], idx) => {
+        if (idx < 3 || !prices) html += '<td>-</td>';
+        else html += `<td>${fmt(unitVal)}</td>`;
+      });
+      html += '</tr><tr><td>원가</td>';
+      cells.forEach(([, , costVal], idx) => {
+        if (idx < 3 || !costs) html += '<td>-</td>';
+        else html += `<td>${Math.round(costVal).toLocaleString("ko-KR")}</td>`;
+      });
+      html += '</tr></table></div>';
+      return html;
+    }
+
+    function formatSpecMixCostTableHTML(entry, prices, costs) {
+      const meta = entry.mixMeta || {};
+      const mat = entry.materials || {};
+      const hasPrice = !!prices;
+      const unit = prices || {};
+
+      let html = '<table class="mini-table"><tr><td></td><td>물시멘트비<br>(W/B)%</td><td>잔골재율<br>(S/a)%</td><td>물<br>(W)kg</td><td>시멘트<br>(C1)kg</td><td>고로슬래그<br>(C2)kg</td><td>세척사<br>(S1)kg</td><td>부순모래<br>(S2)kg</td><td>골재 25mm<br>(G1)kg</td><td>골재 20mm<br>(G2)kg</td><td>혼화제<br>(AD)kg</td></tr>';
+      html += `<tr><td>배합</td><td>${toNum(meta.waterCementRatio)}</td><td>${toNum(meta.fineAggRatio)}</td><td>${toNum(meta.water)}</td><td>${toNum(mat.cement)}</td><td>${toNum(mat.slag)}</td><td>${toNum(mat.washedSand)}</td><td>${toNum(mat.crushedSand)}</td><td>${toNum(mat.mm25)}</td><td>${toNum(mat.mm20)}</td><td>${toNum(mat.admixture)}</td></tr>`;
+      html += `<tr><td>단가</td><td>-</td><td>-</td><td>-</td><td>${hasPrice ? fmt(unit.cement) : "-"}</td><td>${hasPrice ? fmt(unit.slag) : "-"}</td><td>${hasPrice ? fmt(unit.washedSand) : "-"}</td><td>${hasPrice ? fmt(unit.crushedSand) : "-"}</td><td>${hasPrice ? fmt(unit.mm25) : "-"}</td><td>${hasPrice ? fmt(unit.mm20) : "-"}</td><td>${hasPrice ? fmt(unit.admixture) : "-"}</td></tr>`;
+      html += `<tr><td>원가</td><td>-</td><td>-</td><td>-</td><td>${costs ? Math.round(toNum(costs.cement)).toLocaleString("ko-KR") : "-"}</td><td>${costs ? Math.round(toNum(costs.slag)).toLocaleString("ko-KR") : "-"}</td><td>${costs ? Math.round(toNum(costs.washedSand)).toLocaleString("ko-KR") : "-"}</td><td>${costs ? Math.round(toNum(costs.crushedSand)).toLocaleString("ko-KR") : "-"}</td><td>${costs ? Math.round(toNum(costs.mm25)).toLocaleString("ko-KR") : "-"}</td><td>${costs ? Math.round(toNum(costs.mm20)).toLocaleString("ko-KR") : "-"}</td><td>${costs ? Math.round(toNum(costs.admixture)).toLocaleString("ko-KR") : "-"}</td></tr>`;
+      html += "</table>";
+      return html;
+    }
+
+    function costOf(entry, priceSetMap) {
+      const p = priceSetMap.get(entry.priceSetId);
+      if (!p) return null;
+      const mat = entry.materials || {};
+      const prices = p.prices || {};
+      const costs = calcMaterialCosts(mat, prices);
+      return sumProductionCosts(costs);
+    }
+
+    function seedDefaultDataIfEmpty() {
+      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);
+      if (!hasMixHistory) saveJsonArray(MIX_HISTORY_KEY, DEFAULT_MIX_HISTORY);
+      if (!localStorage.getItem(SELECTED_PRICE_SET_KEY)) {
+        localStorage.setItem(SELECTED_PRICE_SET_KEY, "ps_2026_02");
+      }
+    }
+
+    function hydrate() {
+      seedDefaultDataIfEmpty();
+      priceSets = loadJsonArray(PRICE_SETS_KEY).sort((a, b) => new Date(b.createdAt) - new Date(a.createdAt));
+      mixHistory = loadJsonArray(MIX_HISTORY_KEY).sort((a, b) => new Date(b.createdAt) - new Date(a.createdAt));
+    }
+
+    function switchPage(page) {
+      document.getElementById("mainPage").classList.toggle("active", page === "main");
+      document.getElementById("pricePage").classList.toggle("active", page === "price");
+      document.getElementById("goMainBtn").className = page === "main" ? "primary" : "sub";
+      document.getElementById("goPriceBtn").className = page === "price" ? "primary" : "sub";
+      if (page === "main") renderMain();
+      if (page === "price") renderPriceList();
+    }
+
+    function renderPriceSetSelect() {
+      priceSetSelect.innerHTML = "";
+      if (priceSets.length === 0) {
+        const opt = document.createElement("option");
+        opt.value = "";
+        opt.textContent = "등록된 단가 없음";
+        priceSetSelect.appendChild(opt);
+        priceSetSelect.disabled = true;
+        localStorage.removeItem(SELECTED_PRICE_SET_KEY);
+        return;
+      }
+
+      priceSetSelect.disabled = false;
+      const saved = localStorage.getItem(SELECTED_PRICE_SET_KEY);
+      const validSaved = saved && priceSets.some((p) => p.id === saved);
+      const initial = validSaved ? saved : priceSets[0].id;
+
+      priceSets.forEach((set) => {
+        const opt = document.createElement("option");
+        opt.value = set.id;
+        opt.textContent = priceSetLabel(set);
+        if (set.id === initial) opt.selected = true;
+        priceSetSelect.appendChild(opt);
+      });
+
+      localStorage.setItem(SELECTED_PRICE_SET_KEY, initial);
+    }
+
+    function renderMixPriceSetSelect(selectedId) {
+      const mixPriceSetSelect = document.getElementById("mPriceSetId");
+      mixPriceSetSelect.innerHTML = "";
+      if (priceSets.length === 0) {
+        const opt = document.createElement("option");
+        opt.value = "";
+        opt.textContent = "등록된 단가 없음";
+        mixPriceSetSelect.appendChild(opt);
+        mixPriceSetSelect.disabled = true;
+        return;
+      }
+
+      mixPriceSetSelect.disabled = false;
+      const fallbackId = localStorage.getItem(SELECTED_PRICE_SET_KEY) || priceSets[0].id;
+      const targetId = selectedId || fallbackId;
+      let hasTarget = false;
+
+      priceSets.forEach((set) => {
+        const opt = document.createElement("option");
+        opt.value = set.id;
+        opt.textContent = priceSetLabel(set);
+        if (set.id === targetId) {
+          opt.selected = true;
+          hasTarget = true;
+        }
+        mixPriceSetSelect.appendChild(opt);
+      });
+
+      if (!hasTarget) {
+        const missing = document.createElement("option");
+        missing.value = targetId;
+        missing.textContent = "삭제된/미지정 단가";
+        missing.selected = true;
+        mixPriceSetSelect.appendChild(missing);
+      }
+    }
+
+    function renderStatus() {
+      statusRow.innerHTML = "";
+      const setId = localStorage.getItem(SELECTED_PRICE_SET_KEY);
+      const active = priceSets.find((p) => p.id === setId);
+
+      const a = document.createElement("span");
+      a.className = "tag";
+      a.textContent = active ? `현재 단가: ${priceSetLabel(active)}` : "현재 단가: 없음";
+      statusRow.appendChild(a);
+
+      const b = document.createElement("span");
+      b.className = "tag";
+      b.textContent = `등록 배합 이력: ${mixHistory.length}건`;
+      statusRow.appendChild(b);
+    }
+
+    function uniqueLatestSpecs() {
+      const map = new Map();
+      mixHistory.forEach((entry) => {
+        if (!entry.spec) return;
+        if (!map.has(entry.spec)) map.set(entry.spec, entry);
+      });
+      return [...map.entries()]
+        .map(([spec, entry]) => ({ spec, latest: entry }))
+        .sort((a, b) => a.spec.localeCompare(b.spec, "ko-KR", { numeric: true, sensitivity: "base" }));
+    }
+
+    function renderSpecList() {
+      const area = document.getElementById("specListArea");
+      const items = uniqueLatestSpecs();
+
+      if (items.length === 0) {
+        area.innerHTML = '<div class="empty">배합표 이력이 없습니다. "배합표 등록"으로 시작하세요.</div>';
+        document.getElementById("historyArea").className = "empty";
+        document.getElementById("historyArea").textContent = "규격을 선택하세요.";
+        return;
+      }
+
+      const priceSetMap = getPriceSetMap();
+      let html = `
+        <table class="spec-table">
+          <thead>
+            <tr>
+              <th rowspan="2">규격</th>
+              <th colspan="11">최신 배합</th>
+              <th rowspan="2">최신 원가</th>
+              <th rowspan="2">최종 수정</th>
+            </tr>
+            <tr>
+              <th></th>
+              <th>물시멘트비<br>(W/B)%</th>
+              <th>잔골재율<br>(S/a)%</th>
+              <th>물<br>(W)kg</th>
+              <th>시멘트<br>(C1)kg</th>
+              <th>고로슬래그<br>(C2)kg</th>
+              <th>세척사<br>(S1)kg</th>
+              <th>부순모래<br>(S2)kg</th>
+              <th>골재 25mm<br>(G1)kg</th>
+              <th>골재 20mm<br>(G2)kg</th>
+              <th>혼화제<br>(AD)kg</th>
+            </tr>
+          </thead>
+          <tbody>
+      `;
+
+      items.forEach(({ spec, latest }) => {
+        const set = priceSetMap.get(latest.priceSetId);
+        const prices = set ? (set.prices || {}) : null;
+        const costs = set ? calcMaterialCosts(latest.materials || {}, prices) : null;
+        const cost = costOf(latest, priceSetMap);
+        const costText = cost === null ? "단가 미연결" : `${Math.round(cost).toLocaleString("ko-KR")}m3/원`;
+        const meta = latest.mixMeta || {};
+        const mat = latest.materials || {};
+        const unitVals = {
+          cement: set ? fmt(prices.cement) : "-",
+          slag: set ? fmt(prices.slag) : "-",
+          washedSand: set ? fmt(prices.washedSand) : "-",
+          crushedSand: set ? fmt(prices.crushedSand) : "-",
+          mm25: set ? fmt(prices.mm25) : "-",
+          mm20: set ? fmt(prices.mm20) : "-",
+          admixture: set ? fmt(prices.admixture) : "-"
+        };
+        const costVals = {
+          cement: costs ? Math.round(toNum(costs.cement)).toLocaleString("ko-KR") : "-",
+          slag: costs ? Math.round(toNum(costs.slag)).toLocaleString("ko-KR") : "-",
+          washedSand: costs ? Math.round(toNum(costs.washedSand)).toLocaleString("ko-KR") : "-",
+          crushedSand: costs ? Math.round(toNum(costs.crushedSand)).toLocaleString("ko-KR") : "-",
+          mm25: costs ? Math.round(toNum(costs.mm25)).toLocaleString("ko-KR") : "-",
+          mm20: costs ? Math.round(toNum(costs.mm20)).toLocaleString("ko-KR") : "-",
+          admixture: costs ? Math.round(toNum(costs.admixture)).toLocaleString("ko-KR") : "-"
+        };
+
+        html += `
+          <tr>
+            <td rowspan="3"><button class="spec-btn" data-spec="${spec}">${spec}</button></td>
+            <td class="kind-cell"><span class="kind-label">배합</span></td>
+            <td>${toNum(meta.waterCementRatio)}</td>
+            <td>${toNum(meta.fineAggRatio)}</td>
+            <td>${toNum(meta.water)}</td>
+            <td>${toNum(mat.cement)}</td>
+            <td>${toNum(mat.slag)}</td>
+            <td>${toNum(mat.washedSand)}</td>
+            <td>${toNum(mat.crushedSand)}</td>
+            <td>${toNum(mat.mm25)}</td>
+            <td>${toNum(mat.mm20)}</td>
+            <td>${toNum(mat.admixture)}</td>
+            <td rowspan="3">${costText}</td>
+            <td rowspan="3">${formatDateOnly(latest.createdAt)}</td>
+          </tr>
+          <tr>
+            <td class="kind-cell"><span class="kind-label">단가</span></td>
+            <td>-</td>
+            <td>-</td>
+            <td>-</td>
+            <td>${unitVals.cement}</td>
+            <td>${unitVals.slag}</td>
+            <td>${unitVals.washedSand}</td>
+            <td>${unitVals.crushedSand}</td>
+            <td>${unitVals.mm25}</td>
+            <td>${unitVals.mm20}</td>
+            <td>${unitVals.admixture}</td>
+          </tr>
+          <tr>
+            <td class="kind-cell"><span class="kind-label">원가</span></td>
+            <td>-</td>
+            <td>-</td>
+            <td>-</td>
+            <td>${costVals.cement}</td>
+            <td>${costVals.slag}</td>
+            <td>${costVals.washedSand}</td>
+            <td>${costVals.crushedSand}</td>
+            <td>${costVals.mm25}</td>
+            <td>${costVals.mm20}</td>
+            <td>${costVals.admixture}</td>
+          </tr>
+        `;
+      });
+
+      html += "</tbody></table>";
+      area.innerHTML = html;
+
+      area.querySelectorAll(".spec-btn").forEach((btn) => {
+        btn.addEventListener("click", () => {
+          selectedSpec = btn.dataset.spec || "";
+          renderHistory(selectedSpec);
+        });
+      });
+
+      if (items.length > 0 && !items.some((x) => x.spec === selectedSpec)) selectedSpec = "";
+      if (selectedSpec) renderHistory(selectedSpec);
+      else {
+        const history = document.getElementById("historyArea");
+        history.className = "empty";
+        history.textContent = "규격을 클릭하면 이력이 표시됩니다.";
+      }
+    }
+
+    function renderHistory(spec) {
+      const area = document.getElementById("historyArea");
+      if (!spec) {
+        area.className = "empty";
+        area.textContent = "규격을 선택하세요.";
+        return;
+      }
+
+      const rows = mixHistory.filter((x) => x.spec === spec);
+      if (rows.length === 0) {
+        area.className = "empty";
+        area.textContent = "선택한 규격의 이력이 없습니다.";
+        return;
+      }
+
+      const priceSetMap = getPriceSetMap();
+      const rowIdSet = new Set(rows.map((r) => r.id));
+      selectedMixCompareIds = new Set([...selectedMixCompareIds].filter((id) => rowIdSet.has(id)));
+      let html = '<table class="history-table"><thead><tr><th>선택</th><th>적용단가</th><th></th><th>물시멘트비<br>(W/B)%</th><th>잔골재율<br>(S/a)%</th><th>물<br>(W)kg</th><th>시멘트<br>(C1)kg</th><th>고로슬래그<br>(C2)kg</th><th>세척사<br>(S1)kg</th><th>부순모래<br>(S2)kg</th><th>골재 25mm<br>(G1)kg</th><th>골재 20mm<br>(G2)kg</th><th>혼화제<br>(AD)kg</th><th>생산단가</th><th>관리</th></tr></thead><tbody>';
+      html = `<div class="history-tools"><button class="sub" id="openMixCompareBtn">체크 배합 비교</button><span class="count">선택 ${selectedMixCompareIds.size}건</span></div>` + html;
+
+      rows.forEach((entry) => {
+        const set = priceSetMap.get(entry.priceSetId);
+        const setText = set ? priceSetLabel(set) : "삭제된/미지정 단가";
+        const cost = costOf(entry, priceSetMap);
+        const prices = set ? (set.prices || {}) : {};
+        const costs = set ? calcMaterialCosts(entry.materials || {}, prices) : null;
+        const costText = cost === null ? "-" : `${Math.round(cost).toLocaleString("ko-KR")}m3/원`;
+        const meta = entry.mixMeta || {};
+        const mat = entry.materials || {};
+
+        const unitVals = {
+          cement: set ? fmt(prices.cement) : "-",
+          slag: set ? fmt(prices.slag) : "-",
+          washedSand: set ? fmt(prices.washedSand) : "-",
+          crushedSand: set ? fmt(prices.crushedSand) : "-",
+          mm20: set ? fmt(prices.mm20) : "-",
+          mm25: set ? fmt(prices.mm25) : "-",
+          admixture: set ? fmt(prices.admixture) : "-"
+        };
+
+        const costVals = {
+          cement: costs ? Math.round(toNum(costs.cement)).toLocaleString("ko-KR") : "-",
+          slag: costs ? Math.round(toNum(costs.slag)).toLocaleString("ko-KR") : "-",
+          washedSand: costs ? Math.round(toNum(costs.washedSand)).toLocaleString("ko-KR") : "-",
+          crushedSand: costs ? Math.round(toNum(costs.crushedSand)).toLocaleString("ko-KR") : "-",
+          mm20: costs ? Math.round(toNum(costs.mm20)).toLocaleString("ko-KR") : "-",
+          mm25: costs ? Math.round(toNum(costs.mm25)).toLocaleString("ko-KR") : "-",
+          admixture: costs ? Math.round(toNum(costs.admixture)).toLocaleString("ko-KR") : "-"
+        };
+
+        html += `
+          <tr>
+            <td rowspan="3"><label class="pick-row"><input type="checkbox" data-pick-mix="${entry.id}" ${selectedMixCompareIds.has(entry.id) ? "checked" : ""}></label></td>
+            <td rowspan="3">${setText}</td>
+            <td class="kind-cell"><span class="kind-label">배합</span></td>
+            <td>${toNum(meta.waterCementRatio)}</td>
+            <td>${toNum(meta.fineAggRatio)}</td>
+            <td>${toNum(meta.water)}</td>
+            <td>${toNum(mat.cement)}</td>
+            <td>${toNum(mat.slag)}</td>
+            <td>${toNum(mat.washedSand)}</td>
+            <td>${toNum(mat.crushedSand)}</td>
+            <td>${toNum(mat.mm25)}</td>
+            <td>${toNum(mat.mm20)}</td>
+            <td>${toNum(mat.admixture)}</td>
+            <td class="prod-cell" rowspan="3">${costText}</td>
+            <td class="manage-cell" rowspan="3"><div class="manage-wrap"><div class="action-cell"><button class="sub" data-view-calc="${entry.id}">계산</button><button class="sub" data-edit-mix="${entry.id}">수정</button><button class="danger" data-del-mix="${entry.id}">삭제</button></div></div></td>
+          </tr>
+          <tr>
+            <td class="kind-cell"><span class="kind-label">단가</span></td>
+            <td>-</td>
+            <td>-</td>
+            <td>-</td>
+            <td>${unitVals.cement}</td>
+            <td>${unitVals.slag}</td>
+            <td>${unitVals.washedSand}</td>
+            <td>${unitVals.crushedSand}</td>
+            <td>${unitVals.mm25}</td>
+            <td>${unitVals.mm20}</td>
+            <td>${unitVals.admixture}</td>
+          </tr>
+          <tr>
+            <td class="kind-cell"><span class="kind-label">원가</span></td>
+            <td>-</td>
+            <td>-</td>
+            <td>-</td>
+            <td>${costVals.cement}</td>
+            <td>${costVals.slag}</td>
+            <td>${costVals.washedSand}</td>
+            <td>${costVals.crushedSand}</td>
+            <td>${costVals.mm25}</td>
+            <td>${costVals.mm20}</td>
+            <td>${costVals.admixture}</td>
+          </tr>
+        `;
+      });
+
+      html += "</tbody></table>";
+      area.className = "";
+      area.innerHTML = html;
+      const openBtn = document.getElementById("openMixCompareBtn");
+      if (openBtn) openBtn.addEventListener("click", () => openMixComparePopup(spec));
+      area.querySelectorAll("input[data-pick-mix]").forEach((input) => {
+        input.addEventListener("change", () => {
+          const id = input.dataset.pickMix;
+          if (!id) return;
+          if (input.checked) selectedMixCompareIds.add(id);
+          else selectedMixCompareIds.delete(id);
+          const countEl = area.querySelector(".history-tools .count");
+          if (countEl) countEl.textContent = `선택 ${selectedMixCompareIds.size}건`;
+        });
+      });
+      area.querySelectorAll("button[data-view-calc]").forEach((btn) => {
+        btn.addEventListener("click", () => openCalcDetail(btn.dataset.viewCalc));
+      });
+      area.querySelectorAll("button[data-edit-mix]").forEach((btn) => {
+        btn.addEventListener("click", () => editMixEntry(btn.dataset.editMix));
+      });
+      area.querySelectorAll("button[data-del-mix]").forEach((btn) => {
+        btn.addEventListener("click", () => deleteMixEntry(btn.dataset.delMix));
+      });
+    }
+
+    function openCalcDetail(entryId) {
+      const entry = mixHistory.find((x) => x.id === entryId);
+      if (!entry) return;
+      const priceSetMap = getPriceSetMap();
+      const set = priceSetMap.get(entry.priceSetId);
+      if (!set) {
+        calcDetailBody.innerHTML = '<div class="empty">연결된 단가 데이터가 없습니다.</div>';
+        calcModal.classList.add("open");
+        return;
+      }
+
+      const mat = entry.materials || {};
+      const prices = set.prices || {};
+      const wsDensity = toNum(prices.washedSandDensity) || 1600;
+      const csDensity = toNum(prices.crushedSandDensity) || 1600;
+      const mm20Density = toNum(prices.mm20Density) || 1500;
+      const mm25Density = toNum(prices.mm25Density) || 1500;
+
+      const calc = {
+        cement: (toNum(mat.cement) / 1000) * toNum(prices.cement),
+        slag: (toNum(mat.slag) / 1000) * toNum(prices.slag),
+        washedSand: (toNum(mat.washedSand) / wsDensity) * toNum(prices.washedSand),
+        crushedSand: (toNum(mat.crushedSand) / csDensity) * toNum(prices.crushedSand),
+        mm20: (toNum(mat.mm20) / mm20Density) * toNum(prices.mm20),
+        mm25: (toNum(mat.mm25) / mm25Density) * toNum(prices.mm25),
+        admixture: toNum(mat.admixture) * toNum(prices.admixture)
+      };
+      const production = sumProductionCosts(calc);
+
+      const rows = [
+        {
+          name: "시멘트",
+          formula: `${toNum(mat.cement)}kg × ${fmt(prices.cement)}원`,
+          val: calc.cement
+        },
+        {
+          name: "슬래그",
+          formula: `${toNum(mat.slag)}kg × ${fmt(prices.slag)}원`,
+          val: calc.slag
+        },
+        {
+          name: "세척사",
+          formula: `(${toNum(mat.washedSand)}kg / ${wsDensity}m3/kg) × ${fmt(prices.washedSand)}원`,
+          val: calc.washedSand
+        },
+        {
+          name: "부순모래",
+          formula: `(${toNum(mat.crushedSand)}kg / ${csDensity}m3/kg) × ${fmt(prices.crushedSand)}원`,
+          val: calc.crushedSand
+        },
+        {
+          name: "골재 25mm<br>(G1)kg",
+          formula: `(${toNum(mat.mm25)}kg / ${mm25Density}m3/kg) × ${fmt(prices.mm25)}원`,
+          val: calc.mm25
+        },
+        {
+          name: "골재 20mm<br>(G2)kg",
+          formula: `(${toNum(mat.mm20)}kg / ${mm20Density}m3/kg) × ${fmt(prices.mm20)}원`,
+          val: calc.mm20
+        },
+        {
+          name: "혼화제<br>(AD)kg",
+          formula: `${toNum(mat.admixture)}kg × ${fmt(prices.admixture)}원`,
+          val: calc.admixture
+        }
+      ];
+
+      let html = `
+        <div><strong>규격:</strong> ${entry.spec}</div>
+        <div><strong>적용 단가:</strong> ${priceSetLabel(set)}</div>
+        <table>
+          <thead><tr><th>항목</th><th>계산식</th><th>계산값(m3/원)</th></tr></thead>
+          <tbody>
+      `;
+      rows.forEach((r) => {
+        html += `<tr><td>${r.name}</td><td>${r.formula}</td><td>${fmt(r.val)}m3/원</td></tr>`;
+      });
+      html += `
+          </tbody>
+        </table>
+        <div><strong>생산단가 합계:</strong> ${fmt(production)}m3/원</div>
+      `;
+      calcDetailBody.innerHTML = html;
+      calcModal.classList.add("open");
+    }
+
+    function editMixEntry(id) {
+      const entry = mixHistory.find((x) => x.id === id);
+      if (!entry) return;
+      editingMixId = id;
+      mixModalTitle.textContent = "배합표 수정";
+      saveMixBtn.textContent = "수정 저장";
+
+      document.getElementById("mSpec").value = entry.spec || "";
+      document.getElementById("mWaterCementRatio").value = toNum(entry.mixMeta?.waterCementRatio);
+      document.getElementById("mFineAggRatio").value = toNum(entry.mixMeta?.fineAggRatio);
+      document.getElementById("mWater").value = toNum(entry.mixMeta?.water);
+      document.getElementById("mCement").value = toNum(entry.materials?.cement);
+      document.getElementById("mSlag").value = toNum(entry.materials?.slag);
+      document.getElementById("mWashedSand").value = toNum(entry.materials?.washedSand);
+      document.getElementById("mCrushedSand").value = toNum(entry.materials?.crushedSand);
+      document.getElementById("mMm20").value = toNum(entry.materials?.mm20);
+      document.getElementById("mMm25").value = toNum(entry.materials?.mm25);
+      document.getElementById("mAdmixture").value = toNum(entry.materials?.admixture);
+      document.getElementById("mNote").value = entry.note || "";
+      renderMixPriceSetSelect(entry.priceSetId || "");
+
+      mixModal.classList.add("open");
+      document.getElementById("mSpec").focus();
+    }
+
+    function deleteMixEntry(id) {
+      if (!confirm("이 배합표 이력을 삭제하시겠습니까?")) return;
+      mixHistory = mixHistory.filter((x) => x.id !== id);
+      saveJsonArray(MIX_HISTORY_KEY, mixHistory);
+      renderMain();
+    }
+
+    function openModal() {
+      editingMixId = null;
+      mixModalTitle.textContent = "배합표 등록";
+      saveMixBtn.textContent = "저장";
+      clearModalFields();
+      document.getElementById("mSpec").value = selectedSpec || "";
+      renderMixPriceSetSelect(localStorage.getItem(SELECTED_PRICE_SET_KEY) || "");
+      applyMixDraft();
+      mixModal.classList.add("open");
+      document.getElementById("mSpec").focus();
+    }
+
+    function closeModal() {
+      mixModal.classList.remove("open");
+      editingMixId = null;
+      mixModalTitle.textContent = "배합표 등록";
+      saveMixBtn.textContent = "저장";
+    }
+
+    function openPriceModal() {
+      editingPriceId = null;
+      priceModalTitle.textContent = "단가 데이터 입력";
+      savePriceBtnEl.textContent = "단가 저장";
+      applyPriceDraft();
+      priceModal.classList.add("open");
+      syncDensitySnapshotFromInputs();
+      document.getElementById("pYear").focus();
+    }
+
+    function closePriceModal() {
+      priceModal.classList.remove("open");
+      editingPriceId = null;
+      priceModalTitle.textContent = "단가 데이터 입력";
+      savePriceBtnEl.textContent = "단가 저장";
+    }
+
+    function syncDensitySnapshotFromInputs() {
+      densitySnapshot.washedSand = toNum(document.getElementById("pWashedSandDensity").value) || 1600;
+      densitySnapshot.crushedSand = toNum(document.getElementById("pCrushedSandDensity").value) || 1600;
+      densitySnapshot.mm20 = toNum(document.getElementById("pMm20Density").value) || 1500;
+      densitySnapshot.mm25 = toNum(document.getElementById("pMm25Density").value) || 1500;
+    }
+
+    function bindDensityPriceAutoAdjust() {
+      const bindings = [
+        { densityId: "pWashedSandDensity", priceId: "pWashedSandPrice", key: "washedSand" },
+        { densityId: "pCrushedSandDensity", priceId: "pCrushedSandPrice", key: "crushedSand" },
+        { densityId: "pMm20Density", priceId: "pMm20Price", key: "mm20" },
+        { densityId: "pMm25Density", priceId: "pMm25Price", key: "mm25" }
+      ];
+
+      bindings.forEach(({ densityId, priceId, key }) => {
+        const densityInput = document.getElementById(densityId);
+        const priceInput = document.getElementById(priceId);
+        densityInput.addEventListener("input", () => {
+          const prev = toNum(densitySnapshot[key]);
+          const next = toNum(densityInput.value);
+          const price = toNum(priceInput.value);
+          if (prev > 0 && next > 0 && price > 0) {
+            const adjusted = price * (next / prev);
+            priceInput.value = adjusted.toFixed(2);
+          }
+          if (next > 0) densitySnapshot[key] = next;
+        });
+      });
+    }
+
+    function clearModalFields() {
+      ["mWaterCementRatio", "mFineAggRatio", "mWater", "mCement", "mSlag", "mWashedSand", "mCrushedSand", "mMm20", "mMm25", "mAdmixture", "mNote"].forEach((id) => {
+        document.getElementById(id).value = "";
+      });
+    }
+
+    function getMixDraftPayload() {
+      return {
+        mSpec: document.getElementById("mSpec").value,
+        mPriceSetId: document.getElementById("mPriceSetId").value,
+        mWaterCementRatio: document.getElementById("mWaterCementRatio").value,
+        mFineAggRatio: document.getElementById("mFineAggRatio").value,
+        mWater: document.getElementById("mWater").value,
+        mCement: document.getElementById("mCement").value,
+        mSlag: document.getElementById("mSlag").value,
+        mWashedSand: document.getElementById("mWashedSand").value,
+        mCrushedSand: document.getElementById("mCrushedSand").value,
+        mMm20: document.getElementById("mMm20").value,
+        mMm25: document.getElementById("mMm25").value,
+        mAdmixture: document.getElementById("mAdmixture").value,
+        mNote: document.getElementById("mNote").value
+      };
+    }
+
+    function applyMixDraft() {
+      const draft = loadDraft(MIX_DRAFT_KEY);
+      if (!draft) return;
+      Object.entries(draft).forEach(([id, val]) => {
+        const el = document.getElementById(id);
+        if (el) el.value = val ?? "";
+      });
+    }
+
+    function clearMixDraft() {
+      localStorage.removeItem(MIX_DRAFT_KEY);
+    }
+
+    function saveMixEntry() {
+      const spec = document.getElementById("mSpec").value.trim();
+      if (!spec) {
+        alert("규격명을 입력하세요.");
+        return;
+      }
+
+      const selectedPriceSetId = document.getElementById("mPriceSetId").value || localStorage.getItem(SELECTED_PRICE_SET_KEY);
+      if (!selectedPriceSetId) {
+        alert("먼저 단가 데이터를 등록하세요.");
+        return;
+      }
+
+      const entry = {
+        id: editingMixId || crypto.randomUUID(),
+        spec,
+        mixMeta: {
+          waterCementRatio: toNum(document.getElementById("mWaterCementRatio").value),
+          fineAggRatio: toNum(document.getElementById("mFineAggRatio").value),
+          water: toNum(document.getElementById("mWater").value)
+        },
+        materials: {
+          cement: toNum(document.getElementById("mCement").value),
+          slag: toNum(document.getElementById("mSlag").value),
+          washedSand: toNum(document.getElementById("mWashedSand").value),
+          crushedSand: toNum(document.getElementById("mCrushedSand").value),
+          mm20: toNum(document.getElementById("mMm20").value),
+          mm25: toNum(document.getElementById("mMm25").value),
+          admixture: toNum(document.getElementById("mAdmixture").value)
+        },
+        priceSetId: selectedPriceSetId,
+        note: document.getElementById("mNote").value.trim(),
+        createdAt: editingMixId
+          ? (mixHistory.find((x) => x.id === editingMixId)?.createdAt || new Date().toISOString())
+          : new Date().toISOString(),
+        updatedAt: new Date().toISOString()
+      };
+
+      if (editingMixId) {
+        mixHistory = mixHistory.map((x) => (x.id === editingMixId ? entry : x));
+      } else {
+        mixHistory.unshift(entry);
+      }
+      saveJsonArray(MIX_HISTORY_KEY, mixHistory);
+      clearMixDraft();
+      selectedSpec = "";
+      clearModalFields();
+      closeModal();
+      renderMain();
+    }
+
+    function clearPriceForm() {
+      ["pYear", "pMonth", "pCementPrice", "pSlagPrice", "pWashedSandPrice", "pCrushedSandPrice", "pMm20Price", "pMm25Price", "pAdmixturePrice"].forEach((id) => {
+        document.getElementById(id).value = "";
+      });
+      ["pWashedSandDensity", "pCrushedSandDensity", "pMm20Density", "pMm25Density"].forEach((id) => {
+        document.getElementById(id).value = "";
+      });
+      syncDensitySnapshotFromInputs();
+      localStorage.removeItem(PRICE_DRAFT_KEY);
+    }
+
+    function getPriceDraftPayload() {
+      return {
+        pYear: document.getElementById("pYear").value,
+        pMonth: document.getElementById("pMonth").value,
+        pCementPrice: document.getElementById("pCementPrice").value,
+        pSlagPrice: document.getElementById("pSlagPrice").value,
+        pWashedSandPrice: document.getElementById("pWashedSandPrice").value,
+        pCrushedSandPrice: document.getElementById("pCrushedSandPrice").value,
+        pMm20Price: document.getElementById("pMm20Price").value,
+        pMm25Price: document.getElementById("pMm25Price").value,
+        pAdmixturePrice: document.getElementById("pAdmixturePrice").value,
+        pWashedSandDensity: document.getElementById("pWashedSandDensity").value,
+        pCrushedSandDensity: document.getElementById("pCrushedSandDensity").value,
+        pMm20Density: document.getElementById("pMm20Density").value,
+        pMm25Density: document.getElementById("pMm25Density").value
+      };
+    }
+
+    function applyPriceDraft() {
+      const draft = loadDraft(PRICE_DRAFT_KEY);
+      if (!draft) return;
+      Object.entries(draft).forEach(([id, val]) => {
+        const el = document.getElementById(id);
+        if (el) el.value = val ?? "";
+      });
+      syncDensitySnapshotFromInputs();
+    }
+
+    function clearPriceDraft() {
+      localStorage.removeItem(PRICE_DRAFT_KEY);
+    }
+
+    function applyTargetPricePreset() {
+      hydrate();
+      if (!selectedSpec) {
+        alert("먼저 메인 페이지에서 기준 규격을 클릭해 선택하세요.");
+        return;
+      }
+      const baseEntry = mixHistory.find((x) => x.spec === selectedSpec) || null;
+
+      if (!baseEntry) {
+        alert("선택한 규격의 배합 이력이 없어 목표값 반영을 할 수 없습니다.");
+        return;
+      }
+
+      const mat = baseEntry.materials || {};
+      const cementKg = toNum(mat.cement);
+      const slagKg = toNum(mat.slag);
+      const wsKg = toNum(mat.washedSand);
+      const csKg = toNum(mat.crushedSand);
+      const mm25Kg = toNum(mat.mm25);
+      const admixtureKg = toNum(mat.admixture);
+
+      const wsDensity = toNum(document.getElementById("pWashedSandDensity").value) || 1600;
+      const csDensity = toNum(document.getElementById("pCrushedSandDensity").value) || 1600;
+      const mm25Density = toNum(document.getElementById("pMm25Density").value) || 1500;
+
+      if (cementKg <= 0 || slagKg <= 0 || wsKg <= 0 || csKg <= 0 || mm25Kg <= 0 || admixtureKg <= 0) {
+        alert("선택 배합의 시멘트/슬래그/세척사/부순모래/25mm/혼화제 수량이 0보다 커야 합니다.");
+        return;
+      }
+
+      // User requested fixed target costs in this order:
+      // cement, slag, washedSand, crushedSand, mm25, admixture
+      const target = {
+        cement: 31024,
+        slag: 7242,
+        washedSand: 9352,
+        crushedSand: 4709,
+        mm25: 11052,
+        admixture: 3984
+      };
+
+      const userPrice = {
+        cement: toNum(document.getElementById("pCementPrice").value),
+        slag: toNum(document.getElementById("pSlagPrice").value),
+        washedSand: toNum(document.getElementById("pWashedSandPrice").value),
+        crushedSand: toNum(document.getElementById("pCrushedSandPrice").value),
+        mm25: toNum(document.getElementById("pMm25Price").value),
+        admixture: toNum(document.getElementById("pAdmixturePrice").value)
+      };
+
+      const baseCost = {
+        cement: (cementKg / 1000) * userPrice.cement,
+        slag: (slagKg / 1000) * userPrice.slag,
+        washedSand: (wsKg / wsDensity) * userPrice.washedSand,
+        crushedSand: (csKg / csDensity) * userPrice.crushedSand,
+        mm25: (mm25Kg / mm25Density) * userPrice.mm25,
+        admixture: admixtureKg * userPrice.admixture
+      };
+
+      const safeAdj = (t, b) => (b > 0 ? t / b : 1);
+      const adj = {
+        cementAdj: safeAdj(target.cement, baseCost.cement),
+        slagAdj: safeAdj(target.slag, baseCost.slag),
+        washedSandAdj: safeAdj(target.washedSand, baseCost.washedSand),
+        crushedSandAdj: safeAdj(target.crushedSand, baseCost.crushedSand),
+        mm25Adj: safeAdj(target.mm25, baseCost.mm25),
+        admixtureAdj: safeAdj(target.admixture, baseCost.admixture)
+      };
+      // Also apply immediately to the currently selected price set so the result reflects right away.
+      const activePriceSetId = localStorage.getItem(SELECTED_PRICE_SET_KEY);
+      const activeIdx = priceSets.findIndex((p) => p.id === activePriceSetId);
+      if (activeIdx >= 0) {
+        const current = priceSets[activeIdx];
+        priceSets[activeIdx] = {
+          ...current,
+          prices: {
+            ...(current.prices || {}),
+            cementAdj: Number(adj.cementAdj.toFixed(6)),
+            slagAdj: Number(adj.slagAdj.toFixed(6)),
+            washedSandAdj: Number(adj.washedSandAdj.toFixed(6)),
+            crushedSandAdj: Number(adj.crushedSandAdj.toFixed(6)),
+            mm25Adj: Number(adj.mm25Adj.toFixed(6)),
+            admixtureAdj: Number(adj.admixtureAdj.toFixed(6)),
+            washedSandDensity: wsDensity,
+            crushedSandDensity: csDensity,
+            mm25Density: mm25Density
+          },
+          updatedAt: new Date().toISOString()
+        };
+        saveJsonArray(PRICE_SETS_KEY, priceSets);
+        renderPriceList();
+        renderMain();
+      }
+
+      alert(`규격 [${selectedSpec}] 기준 목표값에 맞게 보정계수만 반영했습니다. 입력 단가는 그대로 유지됩니다.`);
+    }
+
+    function validatePriceForm() {
+      const year = toNum(document.getElementById("pYear").value);
+      const month = toNum(document.getElementById("pMonth").value);
+
+      if (!year || !month) {
+        alert("단가인상 년/월을 입력하세요.");
+        return null;
+      }
+      if (month < 1 || month > 12) {
+        alert("월은 1~12 사이여야 합니다.");
+        return null;
+      }
+
+      return {
+        year,
+        month,
+        name: `${year}년 ${month}월 단가인상`,
+        prices: {
+          cement: toNum(document.getElementById("pCementPrice").value),
+          slag: toNum(document.getElementById("pSlagPrice").value),
+          washedSand: toNum(document.getElementById("pWashedSandPrice").value),
+          crushedSand: toNum(document.getElementById("pCrushedSandPrice").value),
+          mm20: toNum(document.getElementById("pMm20Price").value),
+          mm25: toNum(document.getElementById("pMm25Price").value),
+          admixture: toNum(document.getElementById("pAdmixturePrice").value),
+          washedSandDensity: toNum(document.getElementById("pWashedSandDensity").value) || 1600,
+          crushedSandDensity: toNum(document.getElementById("pCrushedSandDensity").value) || 1600,
+          mm20Density: toNum(document.getElementById("pMm20Density").value) || 1500,
+          mm25Density: toNum(document.getElementById("pMm25Density").value) || 1500
+        }
+      };
+    }
+
+    function addPriceSet() {
+      const form = validatePriceForm();
+      if (!form) return;
+
+      if (editingPriceId) {
+        const editingIndex = priceSets.findIndex((p) => p.id === editingPriceId);
+        if (editingIndex < 0) {
+          alert("수정 대상 단가를 찾을 수 없습니다.");
+          return;
+        }
+        const duplicateOther = priceSets.find((p) => p.id !== editingPriceId && p.year === form.year && p.month === form.month);
+        if (duplicateOther) {
+          alert("같은 년/월 단가가 이미 있습니다. 년/월을 변경하거나 기존 항목을 수정하세요.");
+          return;
+        }
+        const existing = priceSets[editingIndex];
+        priceSets[editingIndex] = {
+          ...existing,
+          ...form,
+          prices: {
+            ...(existing.prices || {}),
+            ...(form.prices || {})
+          },
+          updatedAt: new Date().toISOString()
+        };
+        saveJsonArray(PRICE_SETS_KEY, priceSets);
+        localStorage.setItem(SELECTED_PRICE_SET_KEY, editingPriceId);
+        clearPriceDraft();
+        clearPriceForm();
+        renderPriceList();
+        renderMain();
+        closePriceModal();
+        alert("단가를 수정했습니다.");
+        return;
+      }
+
+      const duplicateIndex = priceSets.findIndex((p) => p.year === form.year && p.month === form.month);
+      if (duplicateIndex >= 0) {
+        const existing = priceSets[duplicateIndex];
+        const updated = {
+          ...existing,
+          ...form,
+          prices: {
+            ...(existing.prices || {}),
+            ...(form.prices || {})
+          },
+          updatedAt: new Date().toISOString()
+        };
+        priceSets[duplicateIndex] = updated;
+        saveJsonArray(PRICE_SETS_KEY, priceSets);
+        localStorage.setItem(SELECTED_PRICE_SET_KEY, updated.id);
+        clearPriceDraft();
+        clearPriceForm();
+        renderPriceList();
+        renderMain();
+        closePriceModal();
+        alert("같은 년/월 단가를 업데이트했습니다.");
+        return;
+      }
+
+      const item = {
+        id: crypto.randomUUID(),
+        ...form,
+        prices: {
+          ...(form.prices || {}),
+          cementAdj: 1,
+          slagAdj: 1,
+          washedSandAdj: 1,
+          crushedSandAdj: 1,
+          mm20Adj: 1,
+          mm25Adj: 1,
+          admixtureAdj: 1
+        },
+        createdAt: new Date().toISOString()
+      };
+
+      priceSets.unshift(item);
+      saveJsonArray(PRICE_SETS_KEY, priceSets);
+      localStorage.setItem(SELECTED_PRICE_SET_KEY, item.id);
+      clearPriceDraft();
+      clearPriceForm();
+      renderPriceList();
+      renderMain();
+      closePriceModal();
+      alert("단가가 저장되었습니다.");
+    }
+
+    function deletePriceSet(id) {
+      if (!confirm("이 단가를 삭제하시겠습니까?")) return;
+
+      priceSets = priceSets.filter((x) => x.id !== id);
+      saveJsonArray(PRICE_SETS_KEY, priceSets);
+
+      const selected = localStorage.getItem(SELECTED_PRICE_SET_KEY);
+      if (selected === id) {
+        if (priceSets.length > 0) localStorage.setItem(SELECTED_PRICE_SET_KEY, priceSets[0].id);
+        else localStorage.removeItem(SELECTED_PRICE_SET_KEY);
+      }
+
+      renderPriceList();
+      renderMain();
+    }
+
+    function editPriceSet(id) {
+      const set = priceSets.find((x) => x.id === id);
+      if (!set) return;
+      editingPriceId = id;
+      priceModalTitle.textContent = "단가 데이터 수정";
+      savePriceBtnEl.textContent = "수정 저장";
+
+      document.getElementById("pYear").value = toNum(set.year);
+      document.getElementById("pMonth").value = toNum(set.month);
+      document.getElementById("pCementPrice").value = toNum(set.prices?.cement);
+      document.getElementById("pSlagPrice").value = toNum(set.prices?.slag);
+      document.getElementById("pWashedSandPrice").value = toNum(set.prices?.washedSand);
+      document.getElementById("pCrushedSandPrice").value = toNum(set.prices?.crushedSand);
+      document.getElementById("pMm20Price").value = toNum(set.prices?.mm20);
+      document.getElementById("pMm25Price").value = toNum(set.prices?.mm25);
+      document.getElementById("pAdmixturePrice").value = toNum(set.prices?.admixture);
+      document.getElementById("pWashedSandDensity").value = toNum(set.prices?.washedSandDensity) || 1600;
+      document.getElementById("pCrushedSandDensity").value = toNum(set.prices?.crushedSandDensity) || 1600;
+      document.getElementById("pMm20Density").value = toNum(set.prices?.mm20Density) || 1500;
+      document.getElementById("pMm25Density").value = toNum(set.prices?.mm25Density) || 1500;
+      syncDensitySnapshotFromInputs();
+      priceModal.classList.add("open");
+      document.getElementById("pYear").focus();
+    }
+
+    function renderPriceList() {
+      const area = document.getElementById("priceListArea");
+      if (priceSets.length === 0) {
+        area.innerHTML = '<div class="empty">저장된 단가가 없습니다.</div>';
+        renderPriceCompareControls();
+        return;
+      }
+
+      let html = `
+        <table class="line-less-table spec-table">
+          <thead>
+            <tr>
+              <th rowspan="2">단가인상</th>
+              <th colspan="8">단가</th>
+              <th rowspan="2">등록일시</th>
+              <th rowspan="2">관리</th>
+            </tr>
+            <tr>
+              <th></th>
+              <th>시멘트<br>(C1)kg</th>
+              <th>고로슬래그<br>(C2)kg</th>
+              <th>세척사<br>(S1)kg</th>
+              <th>부순모래<br>(S2)kg</th>
+              <th>골재 25mm<br>(G1)kg</th>
+              <th>골재 20mm<br>(G2)kg</th>
+              <th>혼화제<br>(AD)kg</th>
+            </tr>
+          </thead>
+          <tbody>
+      `;
+
+      priceSets.forEach((set) => {
+        const p = set.prices || {};
+        html += `
+          <tr>
+            <td>${priceSetLabel(set)}</td>
+            <td class="kind-cell">단가</td>
+            <td>${fmt(p.cement)}</td>
+            <td>${fmt(p.slag)}</td>
+            <td>${fmt(p.washedSand)}</td>
+            <td>${fmt(p.crushedSand)}</td>
+            <td>${fmt(p.mm25)}</td>
+            <td>${fmt(p.mm20)}</td>
+            <td>${fmt(p.admixture)}</td>
+            <td>${formatDateTime(set.createdAt)}</td>
+            <td><button class="sub" data-edit-price="${set.id}">수정</button> <button class="danger" data-del="${set.id}">삭제</button></td>
+          </tr>
+        `;
+      });
+
+      html += "</tbody></table>";
+      area.innerHTML = html;
+
+      area.querySelectorAll("button[data-edit-price]").forEach((btn) => {
+        btn.addEventListener("click", () => editPriceSet(btn.dataset.editPrice));
+      });
+      area.querySelectorAll("button[data-del]").forEach((btn) => {
+        btn.addEventListener("click", () => deletePriceSet(btn.dataset.del));
+      });
+      renderPriceCompareControls();
+    }
+
+    function fmt(n) {
+      const v = toNum(n);
+      const rounded = Math.round(v * 100) / 100;
+      return Number.isInteger(rounded) ? rounded.toLocaleString("ko-KR") : rounded.toLocaleString("ko-KR", { minimumFractionDigits: 2, maximumFractionDigits: 2 });
+    }
+
+    function drawPriceCompareChart(canvas, base, target) {
+      if (!canvas || !base || !target) return;
+      const dpr = window.devicePixelRatio || 1;
+      const cssWidth = canvas.clientWidth || 900;
+      const cssHeight = canvas.clientHeight || 260;
+      canvas.width = Math.floor(cssWidth * dpr);
+      canvas.height = Math.floor(cssHeight * dpr);
+
+      const ctx = canvas.getContext("2d");
+      if (!ctx) return;
+      ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
+      ctx.clearRect(0, 0, cssWidth, cssHeight);
+
+      const padding = { top: 22, right: 12, bottom: 50, left: 48 };
+      const plotW = cssWidth - padding.left - padding.right;
+      const plotH = cssHeight - padding.top - padding.bottom;
+      const keys = PRICE_COMPARE_FIELDS.map((f) => f.key);
+      const labels = PRICE_COMPARE_FIELDS.map((f) => f.label.replace(" 단가", ""));
+      const baseVals = keys.map((k) => toNum((base.prices || {})[k]));
+      const targetVals = keys.map((k) => toNum((target.prices || {})[k]));
+      const maxVal = Math.max(1, ...baseVals, ...targetVals);
+      const groupW = plotW / keys.length;
+      const barW = Math.max(10, Math.min(22, groupW * 0.28));
+
+      ctx.strokeStyle = "#d1d5db";
+      ctx.lineWidth = 1;
+      ctx.beginPath();
+      ctx.moveTo(padding.left, padding.top);
+      ctx.lineTo(padding.left, padding.top + plotH);
+      ctx.lineTo(padding.left + plotW, padding.top + plotH);
+      ctx.stroke();
+
+      ctx.fillStyle = "#94a3b8";
+      ctx.font = "11px 'Segoe UI', 'Noto Sans KR', sans-serif";
+      ctx.textAlign = "right";
+      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.strokeStyle = "#eef2f7";
+        ctx.beginPath();
+        ctx.moveTo(padding.left, y);
+        ctx.lineTo(padding.left + plotW, y);
+        ctx.stroke();
+      }
+
+      keys.forEach((_, i) => {
+        const centerX = padding.left + groupW * i + groupW / 2;
+        const baseH = (baseVals[i] / maxVal) * plotH;
+        const targetH = (targetVals[i] / maxVal) * plotH;
+        const baseX = centerX - barW - 2;
+        const targetX = centerX + 2;
+        const baseY = padding.top + plotH - baseH;
+        const targetY = padding.top + plotH - targetH;
+
+        ctx.fillStyle = "#64748b";
+        ctx.fillRect(baseX, baseY, barW, baseH);
+        ctx.fillStyle = "#0f766e";
+        ctx.fillRect(targetX, targetY, barW, targetH);
+
+        ctx.fillStyle = "#1f2937";
+        ctx.textAlign = "center";
+        ctx.fillText(labels[i], centerX, padding.top + plotH + 16);
+      });
+
+      ctx.fillStyle = "#64748b";
+      ctx.fillRect(padding.left, cssHeight - 18, 10, 10);
+      ctx.fillStyle = "#1f2937";
+      ctx.textAlign = "left";
+      ctx.fillText("기준", padding.left + 14, cssHeight - 9);
+      ctx.fillStyle = "#0f766e";
+      ctx.fillRect(padding.left + 54, cssHeight - 18, 10, 10);
+      ctx.fillStyle = "#1f2937";
+      ctx.fillText("비교", padding.left + 68, cssHeight - 9);
+    }
+
+    function drawMixCostCompareChart(canvas, labels, datasets) {
+      if (!canvas || !labels || labels.length === 0 || !datasets || datasets.length === 0) return;
+      const dpr = window.devicePixelRatio || 1;
+      const cssWidth = canvas.clientWidth || 980;
+      const cssHeight = canvas.clientHeight || 300;
+      canvas.width = Math.floor(cssWidth * dpr);
+      canvas.height = Math.floor(cssHeight * dpr);
+
+      const ctx = canvas.getContext("2d");
+      if (!ctx) return;
+      ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
+      ctx.clearRect(0, 0, cssWidth, cssHeight);
+
+      const colors = ["#0f766e", "#1d4ed8", "#dc2626", "#7c3aed", "#ea580c", "#0e7490", "#4f46e5", "#a16207"];
+      const padding = { top: 24, right: 12, bottom: 96, left: 54 };
+      const plotW = cssWidth - padding.left - padding.right;
+      const plotH = cssHeight - padding.top - padding.bottom;
+      const allVals = datasets.flatMap((d) => d.values);
+      const maxVal = Math.max(1, ...allVals);
+      const groupW = plotW / labels.length;
+      const slotW = Math.max(8, Math.min(20, groupW / (datasets.length + 1)));
+      const usedW = slotW * datasets.length;
+      const startShift = usedW / 2;
+
+      ctx.strokeStyle = "#d1d5db";
+      ctx.beginPath();
+      ctx.moveTo(padding.left, padding.top);
+      ctx.lineTo(padding.left, padding.top + plotH);
+      ctx.lineTo(padding.left + plotW, padding.top + plotH);
+      ctx.stroke();
+
+      ctx.fillStyle = "#94a3b8";
+      ctx.font = "11px 'Segoe UI', 'Noto Sans KR', sans-serif";
+      ctx.textAlign = "right";
+      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.strokeStyle = "#eef2f7";
+        ctx.beginPath();
+        ctx.moveTo(padding.left, y);
+        ctx.lineTo(padding.left + plotW, y);
+        ctx.stroke();
+      }
+
+      labels.forEach((label, i) => {
+        const centerX = padding.left + groupW * i + groupW / 2;
+        datasets.forEach((ds, di) => {
+          const v = toNum(ds.values[i]);
+          const h = (v / maxVal) * plotH;
+          const x = centerX - startShift + di * slotW;
+          const y = padding.top + plotH - h;
+          ctx.fillStyle = colors[di % colors.length];
+          ctx.fillRect(x, y, slotW - 2, h);
+        });
+        ctx.fillStyle = "#1f2937";
+        ctx.textAlign = "center";
+        ctx.fillText(label, centerX, padding.top + plotH + 16);
+      });
+
+      let lx = padding.left;
+      let ly = cssHeight - 14;
+      const legendRowStep = 16;
+      const maxLegendX = cssWidth - padding.right - 120;
+      datasets.forEach((ds, di) => {
+        if (lx > maxLegendX) {
+          lx = padding.left;
+          ly += legendRowStep;
+        }
+        const color = colors[di % colors.length];
+        ctx.fillStyle = color;
+        ctx.fillRect(lx, ly - 9, 10, 10);
+        ctx.fillStyle = "#1f2937";
+        ctx.textAlign = "left";
+        const name = ds.name.length > 16 ? `${ds.name.slice(0, 16)}...` : ds.name;
+        ctx.fillText(name, lx + 14, ly);
+        lx += 150;
+      });
+    }
+
+    function openMixComparePopup(spec) {
+      const rows = mixHistory.filter((x) => x.spec === spec && selectedMixCompareIds.has(x.id));
+      if (rows.length === 0) {
+        alert("비교할 배합을 먼저 체크하세요.");
+        return;
+      }
+      const priceSetMap = getPriceSetMap();
+      const itemLabels = MATERIALS.map((m) => m.label).concat(["생산단가"]);
+
+      const prepared = rows.map((entry) => {
+        const set = priceSetMap.get(entry.priceSetId);
+        const prices = set ? (set.prices || {}) : {};
+        const costs = set ? calcMaterialCosts(entry.materials || {}, prices) : null;
+        const production = costs ? sumProductionCosts(costs) : 0;
+        const values = [
+          toNum(costs?.cement),
+          toNum(costs?.slag),
+          toNum(costs?.washedSand),
+          toNum(costs?.crushedSand),
+          toNum(costs?.mm25),
+          toNum(costs?.mm20),
+          toNum(costs?.admixture),
+          production
+        ];
+        return {
+          name: `${priceSetLabel(set)} (${formatDateOnly(entry.createdAt).replace(/\s/g, "")})`,
+          values
+        };
+      });
+
+      let html = '<table class="line-less-table"><thead><tr><th>항목</th>';
+      prepared.forEach((p) => {
+        html += `<th>${p.name}</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>`;
+        });
+        html += "</tr>";
+      });
+      html += "</tbody></table>";
+      html += `
+        <div class="compare-chart-wrap">
+          <div class="compare-chart-title">체크된 배합 금액 비교 그래프</div>
+          <canvas id="mixCompareChart"></canvas>
+        </div>
+      `;
+      mixCompareBody.innerHTML = html;
+      mixCompareModal.classList.add("open");
+      drawMixCostCompareChart(
+        document.getElementById("mixCompareChart"),
+        itemLabels,
+        prepared.map((p) => ({ name: p.name, values: p.values }))
+      );
+    }
+
+    function renderPriceCompareControls() {
+      compareBaseSelect.innerHTML = "";
+      compareTargetSelect.innerHTML = "";
+      const area = document.getElementById("priceCompareArea");
+
+      if (priceSets.length < 2) {
+        area.className = "empty";
+        area.textContent = "단가 2개 이상 등록 시 비교표가 표시됩니다.";
+        return;
+      }
+
+      priceSets.forEach((set, idx) => {
+        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);
+      });
+
+      renderPriceComparison();
+    }
+
+    function renderPriceComparison() {
+      const area = document.getElementById("priceCompareArea");
+      const base = priceSets.find((x) => x.id === compareBaseSelect.value);
+      const target = priceSets.find((x) => x.id === compareTargetSelect.value);
+
+      if (!base || !target) {
+        area.className = "empty";
+        area.textContent = "비교할 단가를 선택하세요.";
+        return;
+      }
+
+      if (base.id === target.id) {
+        area.className = "empty";
+        area.textContent = "기준 단가와 비교 단가를 다르게 선택하세요.";
+        return;
+      }
+
+      let html = '<table class="line-less-table"><thead><tr><th>항목</th><th>기준값</th><th>비교값</th><th>차이(비교-기준)</th><th>변화율</th></tr></thead><tbody>';
+      PRICE_COMPARE_FIELDS.forEach((f) => {
+        const b = toNum((base.prices || {})[f.key]);
+        const t = toNum((target.prices || {})[f.key]);
+        const diff = t - b;
+        const rate = b === 0 ? "-" : `${((diff / b) * 100).toFixed(2)}%`;
+        html += `
+          <tr>
+            <td>${f.label}</td>
+            <td>${fmt(b)}</td>
+            <td>${fmt(t)}</td>
+            <td>${diff >= 0 ? "+" : ""}${fmt(diff)}</td>
+            <td>${rate}</td>
+          </tr>
+        `;
+      });
+      html += "</tbody></table>";
+      html += `
+        <div class="compare-chart-wrap">
+          <div class="compare-chart-title">항목별 기준/비교 그래프</div>
+          <canvas id="priceCompareChart"></canvas>
+        </div>
+      `;
+      area.className = "";
+      area.innerHTML = html;
+      drawPriceCompareChart(document.getElementById("priceCompareChart"), base, target);
+    }
+
+    function renderMain() {
+      hydrate();
+      renderPriceSetSelect();
+      renderStatus();
+      renderSpecList();
+    }
+
+    function init() {
+      hydrate();
+      renderMain();
+      renderPriceList();
+      switchPage("main");
+    }
+
+    document.getElementById("goMainBtn").addEventListener("click", () => switchPage("main"));
+    document.getElementById("goPriceBtn").addEventListener("click", () => switchPage("price"));
+    document.getElementById("refreshBtn").addEventListener("click", renderMain);
+    document.getElementById("newMixBtn").addEventListener("click", openModal);
+    document.getElementById("closeModalBtn").addEventListener("click", closeModal);
+    document.getElementById("cancelBtn").addEventListener("click", closeModal);
+    document.getElementById("saveMixBtn").addEventListener("click", saveMixEntry);
+    document.getElementById("savePriceBtn").addEventListener("click", addPriceSet);
+    document.getElementById("clearPriceBtn").addEventListener("click", clearPriceForm);
+    document.getElementById("openPriceModalBtn").addEventListener("click", openPriceModal);
+    document.getElementById("closePriceModalBtn").addEventListener("click", closePriceModal);
+    compareBaseSelect.addEventListener("change", renderPriceComparison);
+    compareTargetSelect.addEventListener("change", renderPriceComparison);
+    document.getElementById("swapCompareBtn").addEventListener("click", () => {
+      const a = compareBaseSelect.value;
+      compareBaseSelect.value = compareTargetSelect.value;
+      compareTargetSelect.value = a;
+      renderPriceComparison();
+    });
+
+    priceSetSelect.addEventListener("change", () => {
+      localStorage.setItem(SELECTED_PRICE_SET_KEY, priceSetSelect.value);
+      renderMain();
+    });
+
+    [
+      "mSpec", "mPriceSetId", "mWaterCementRatio", "mFineAggRatio", "mWater",
+      "mCement", "mSlag", "mWashedSand", "mCrushedSand", "mMm20", "mMm25", "mAdmixture", "mNote"
+    ].forEach((id) => {
+      const el = document.getElementById(id);
+      if (el) el.addEventListener("input", () => saveDraft(MIX_DRAFT_KEY, getMixDraftPayload()));
+    });
+
+    [
+      "pYear", "pMonth", "pCementPrice", "pSlagPrice", "pWashedSandPrice", "pCrushedSandPrice",
+      "pMm20Price", "pMm25Price", "pAdmixturePrice", "pWashedSandDensity", "pCrushedSandDensity", "pMm20Density", "pMm25Density"
+    ].forEach((id) => {
+      const el = document.getElementById(id);
+      if (el) el.addEventListener("input", () => saveDraft(PRICE_DRAFT_KEY, getPriceDraftPayload()));
+    });
+
+    bindDensityPriceAutoAdjust();
+
+    mixModal.addEventListener("click", (e) => {
+      if (e.target === mixModal) closeModal();
+    });
+    priceModal.addEventListener("click", (e) => {
+      if (e.target === priceModal) closePriceModal();
+    });
+    document.getElementById("closeCalcModalBtn").addEventListener("click", () => {
+      calcModal.classList.remove("open");
+    });
+    document.getElementById("closeMixCompareModalBtn").addEventListener("click", () => {
+      mixCompareModal.classList.remove("open");
+    });
+    calcModal.addEventListener("click", (e) => {
+      if (e.target === calcModal) calcModal.classList.remove("open");
+    });
+    mixCompareModal.addEventListener("click", (e) => {
+      if (e.target === mixCompareModal) mixCompareModal.classList.remove("open");
+    });
+
+    init();
+  </script>
+</body>
+</html>
\ No newline at end of file
