:root {
      --teal-card: #0d6b82;
      --coral-orange: #d94b28;
      --navy-dark: #084052;
      --cream-bg: #f4f6f8;
      --card-bg: #ffffff;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --border: #e2e8f0;
      --success: #10b981;
      --success-bg: #ecfdf5;
      --danger: #ef4444;
      --danger-bg: #fef2f2;
      --accent-purple: #8b5cf6;
    }

    * { box-sizing: border-box; margin: 0; padding: 0; }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
      background-color: var(--cream-bg);
      color: var(--text-main);
      padding-bottom: 40px;
    }

    .navbar {
      background-color: var(--teal-card);
      color: white;
      padding: 16px 30px;
      border-bottom: 5px solid var(--coral-orange);
      display: flex;
      justify-content: space-between;
      align-items: center;
      box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    }

    .navbar-brand { display: flex; flex-direction: column; }
    .logo-container { display: inline-flex; align-items: center; gap: 12px; }
    .eiffel-icon { width: 26px; height: 32px; fill: white; }

    .navbar h1 {
      font-family: 'Georgia', serif;
      font-size: 24px;
      font-weight: 700;
      letter-spacing: 1.5px;
      text-transform: uppercase;
    }

    .navbar p {
      font-size: 12px;
      color: #e2f1f5;
      margin-top: 2px;
      font-style: italic;
    }

    .btn-import-top {
      background-color: rgba(255, 255, 255, 0.15);
      color: white;
      border: 1px solid rgba(255, 255, 255, 0.3);
      padding: 8px 14px;
      font-size: 13px;
      font-weight: 600;
      border-radius: 6px;
      cursor: pointer;
      transition: all 0.2s ease;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .btn-import-top:hover { background-color: rgba(255, 255, 255, 0.25); }
    .hidden-file-input { display: none; }
    .container { max-width: 1200px; margin: 20px auto; padding: 0 20px; }

    /* TAB NAVIGATION BAR */
    .tab-bar {
      display: flex;
      gap: 8px;
      background: white;
      padding: 8px;
      border-radius: 10px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
      border: 1px solid var(--border);
      margin-bottom: 20px;
    }

    .tab-btn {
      flex: 1;
      padding: 12px 16px;
      background: transparent;
      border: none;
      border-radius: 6px;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-muted);
      cursor: pointer;
      transition: all 0.2s ease;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    .tab-btn:hover { background-color: #f1f5f9; color: var(--navy-dark); }
    .tab-btn.active {
      background-color: var(--navy-dark);
      color: white;
      box-shadow: 0 2px 6px rgba(8, 64, 82, 0.2);
    }

    /* TAB CONTENT PANELS */
    .tab-content { display: none; }
    .tab-content.active { display: block; animation: fadeIn 0.25s ease-in-out; }

    @keyframes fadeIn {
      from { opacity: 0; transform: translateY(4px); }
      to { opacity: 1; transform: translateY(0); }
    }

    /* STAT CARDS */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 16px;
      margin-bottom: 24px;
    }

    .stat-card {
      background: #ffffff;
      border-radius: 12px;
      padding: 18px 16px;
      border: 1px solid #e2e8f0;
      border-left: 6px solid var(--teal-card);
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .stat-content { display: flex; flex-direction: column; }
    .stat-card h3 {
      font-size: 11px;
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 0.8px;
      color: var(--text-muted);
      margin-bottom: 6px;
    }

    .stat-card p {
      font-size: 22px;
      font-weight: 800;
      color: var(--navy-dark);
      line-height: 1.1;
    }

    .stat-icon {
      width: 40px;
      height: 40px;
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
      background-color: rgba(13, 107, 130, 0.08);
      color: var(--teal-card);
    }

    .stat-icon svg { width: 20px; height: 20px; fill: currentColor; }

    .stat-card.sales {
      border-left-color: var(--success);
      background: linear-gradient(135deg, #ffffff 0%, #f0fdf4 100%);
    }
    .stat-card.sales .stat-icon { background-color: rgba(16, 185, 129, 0.12); color: var(--success); }
    .stat-card.sales p { color: var(--success); }

    .stat-card.lifetime {
      border-left-color: var(--accent-purple);
      background: linear-gradient(135deg, #ffffff 0%, #f3e8ff 100%);
    }
    .stat-card.lifetime .stat-icon { background-color: rgba(139, 92, 246, 0.12); color: var(--accent-purple); }
    .stat-card.lifetime p { color: var(--accent-purple); }

    /* NOUVEAU STYLE : TOTAL INVENTORY VALUE */
    .stat-card.inventory-val {
      border-left-color: var(--danger);
      background: linear-gradient(135deg, #ffffff 0%, #fef2f2 100%);
    }
    .stat-card.inventory-val .stat-icon { background-color: rgba(239, 68, 68, 0.12); color: var(--danger); }
    .stat-card.inventory-val p { color: var(--danger); }

    /* CARDS & TABLES */
    .card {
      background: var(--card-bg);
      border-radius: 10px;
      padding: 22px;
      border: 1px solid var(--border);
      box-shadow: 0 2px 6px rgba(0,0,0,0.03);
      margin-bottom: 20px;
    }

    .card-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
      margin-bottom: 16px;
    }

    .card-header h2, .card h3 {
      font-size: 16px;
      font-weight: 700;
      color: var(--navy-dark);
    }

    .stock-toolbar {
      display: flex;
      gap: 12px;
      flex-wrap: wrap;
      align-items: center;
      margin-bottom: 16px;
      background-color: #f8fafc;
      padding: 12px;
      border-radius: 6px;
      border: 1px solid var(--border);
    }

    .stock-search-input, .stock-filter-select {
      padding: 8px 12px;
      border: 1px solid var(--border);
      border-radius: 6px;
      font-size: 13px;
      outline: none;
      background-color: white;
    }

    .stock-search-input { flex: 1; min-width: 200px; }
    .stock-search-input:focus, .stock-filter-select:focus { border-color: var(--teal-card); }

    .low-stock-toggle {
      display: flex;
      align-items: center;
      gap: 6px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
      white-space: nowrap;
      cursor: pointer;
    }
    .low-stock-toggle input[type="checkbox"] { width: 15px; height: 15px; cursor: pointer; accent-color: var(--danger); }

    .low-stock-threshold-label {
      display: flex;
      align-items: center;
      gap: 6px;
      font-size: 13px;
      color: var(--text-muted);
      white-space: nowrap;
    }
    .threshold-input {
      width: 56px;
      padding: 6px 8px;
      border: 1px solid var(--border);
      border-radius: 6px;
      font-size: 13px;
      outline: none;
    }
    .threshold-input:focus { border-color: var(--teal-card); }

    .pagination-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-top: 14px;
      padding-top: 10px;
      border-top: 1px solid var(--border);
      font-size: 13px;
      color: var(--text-muted);
    }

    .pagination-btns { display: flex; gap: 6px; }
    .btn-page {
      background: white;
      border: 1px solid var(--border);
      padding: 6px 12px;
      font-size: 12px;
      border-radius: 4px;
      cursor: pointer;
      transition: all 0.2s;
    }

    .btn-page:hover:not(:disabled) {
      background-color: var(--teal-card);
      color: white;
      border-color: var(--teal-card);
    }

    .btn-page:disabled { opacity: 0.5; cursor: not-allowed; }

    .table-container { overflow-x: auto; border-radius: 8px; border: 1px solid var(--border); }

    table { width: 100%; border-collapse: collapse; background: white; font-size: 12px; }

    th {
      background-color: var(--navy-dark);
      color: white;
      font-weight: 600;
      text-transform: uppercase;
      font-size: 10px;
      letter-spacing: 0.5px;
      padding: 10px 8px;
      text-align: right;
      border: 1px solid #0f5266;
      user-select: none;
    }

    th.section-header { text-align: center; font-size: 11px; }
    th.sales-group { background-color: #d97706; }
    th.cash-group { background-color: #0d6b82; }
    th.paytm-group { background-color: #2563eb; }
    th.sortable { cursor: pointer; text-align: left; }
    th.sortable:hover { background-color: var(--teal-card); }

    td { padding: 8px; border: 1px solid var(--border); text-align: right; vertical-align: middle; }
    td.date-col { text-align: center; font-weight: 600; color: var(--navy-dark); }

    tr.today-row { background-color: #f0fdf4 !important; font-weight: 500; }
    tr:hover { background-color: #f8fafc; }

    tr.total-row { background-color: #fef3c7; font-weight: bold; }
    tr.total-row td { border-top: 2px solid #d97706; border-bottom: 2px solid #d97706; }

    .form-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
      gap: 12px;
      margin-top: 12px;
    }

    .form-group { display: flex; flex-direction: column; gap: 4px; }
    .form-group label { font-size: 12px; font-weight: 600; color: var(--navy-dark); }
    .form-group input, .form-group select {
      padding: 9px 12px;
      border: 1px solid var(--border);
      border-radius: 6px;
      font-size: 13px;
      outline: none;
      background-color: white;
    }

    .form-group input:focus, .form-group select:focus { border-color: var(--teal-card); }

    .btn-add, .btn-cart, .btn-sale, .btn-export {
      border: none;
      padding: 9px 16px;
      font-size: 13px;
      font-weight: 600;
      border-radius: 6px;
      cursor: pointer;
      transition: all 0.2s ease;
    }

    .btn-add { background-color: var(--coral-orange); color: white; height: 38px; align-self: flex-end; }
    .btn-cart { background-color: var(--teal-card); color: white; height: 38px; align-self: flex-end; }
    .btn-sale { background-color: var(--success); color: white; padding: 10px 22px; font-size: 14px; }
    .btn-export { background-color: var(--teal-card); color: white; }

    .btn-add:hover, .btn-cart:hover, .btn-sale:hover, .btn-export:hover {
      opacity: 0.9;
      transform: translateY(-1px);
    }

    .cart-container {
      margin-top: 16px;
      border: 1px solid var(--border);
      border-radius: 8px;
      background: #f8fafc;
      padding: 16px;
    }

    .cart-footer {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 14px;
      padding-top: 14px;
      border-top: 1px dashed var(--border);
    }

    .checkout-controls { display: flex; align-items: center; gap: 12px; }

    input[type="number"] {
      width: 80px;
      padding: 6px 10px;
      border: 1px solid var(--border);
      border-radius: 6px;
      font-size: 13px;
      outline: none;
    }

    .badge { display: inline-block; padding: 3px 8px; border-radius: 12px; font-size: 11px; font-weight: 600; }
    .badge-low { background-color: var(--danger-bg); color: var(--danger); }
    .badge-ok { background-color: var(--success-bg); color: var(--success); }

    .badge-pay {
      padding: 3px 8px;
      border-radius: 4px;
      font-size: 11px;
      font-weight: 700;
      text-transform: uppercase;
    }

    .pay-cash { background-color: #e0f2fe; color: #0369a1; }
    .pay-card { background-color: #f3e8ff; color: #6b21a8; }
    .pay-paytm { background-color: #e0f2fe; color: #0284c7; border: 1px solid #0284c7; }

    .btn-delete {
      background: none;
      border: none;
      color: var(--danger);
      cursor: pointer;
      font-weight: bold;
      font-size: 18px;
      line-height: 1;
    }

    .sales-breakdown { font-size: 11px; color: var(--text-muted); margin-top: 4px; }

    .note-box {
      background-color: #fffbe3;
      border: 1px solid #fef08a;
      border-left: 4px solid #eab308;
      padding: 12px 16px;
      border-radius: 6px;
      font-size: 12px;
      color: #713f12;
      margin-top: 16px;
    }

    /* MODAL STYLES */
    .modal-overlay {
      position: fixed;
      top: 0; left: 0;
      width: 100vw; height: 100vh;
      background: rgba(8, 64, 82, 0.4);
      backdrop-filter: blur(4px);
      display: flex;
      align-items: center;
      justify-content: center;
      z-index: 1000;
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.2s ease-in-out;
    }

    .modal-overlay.active { opacity: 1; pointer-events: auto; }

    .modal-card {
      background: white;
      border-radius: 12px;
      padding: 24px;
      width: 90%;
      max-width: 440px;
      box-shadow: 0 10px 25px rgba(0,0,0,0.15);
      text-align: center;
      transform: translateY(10px);
      transition: transform 0.2s ease-in-out;
    }

    .modal-overlay.active .modal-card { transform: translateY(0); }
    .modal-card h3 { font-size: 18px; color: var(--navy-dark); margin-bottom: 8px; }
    .modal-card p { font-size: 13px; color: var(--text-muted); margin-bottom: 20px; line-height: 1.4; }
    .modal-actions { display: flex; flex-direction: column; gap: 10px; }

    .btn-modal {
      padding: 10px;
      border-radius: 6px;
      border: none;
      font-size: 13px;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.2s ease;
    }

    .btn-merge { background-color: var(--teal-card); color: white; }
    .btn-replace { background-color: var(--coral-orange); color: white; }
    .btn-cancel { background-color: transparent; color: var(--text-muted); border: 1px solid var(--border); }
    .btn-modal:hover { opacity: 0.9; transform: translateY(-1px); }

    /* FAST CHECKOUT — type-ahead product picker */
    .sale-search-group, .add-search-group { position: relative; }
    .add-search-group .sale-results { min-width: 300px; }

    .sale-results {
      position: absolute;
      left: 0;
      right: 0;
      top: 100%;
      z-index: 30;
      margin-top: 3px;
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: 6px;
      box-shadow: 0 10px 24px rgba(8, 64, 82, 0.12);
      max-height: 300px;
      overflow-y: auto;
    }

    .sale-row {
      display: flex;
      flex-direction: column;
      gap: 2px;
      padding: 8px 12px;
      cursor: pointer;
      border-bottom: 1px solid #f1f5f9;
    }
    .sale-row:last-child { border-bottom: 0; }
    .sale-row.hl { background-color: var(--teal-card); }
    .sale-row.hl .sr-name, .sale-row.hl .sr-meta { color: #ffffff; }
    .sale-row.out { opacity: 0.45; }
    .sr-name { font-weight: 600; font-size: 13px; color: var(--text-main); }
    .sr-meta { font-size: 11px; color: var(--text-muted); }
    .sale-none { padding: 10px 12px; font-size: 12px; color: var(--text-muted); }

    .cart-step {
      width: 24px;
      height: 24px;
      border: 1px solid var(--border);
      background: #ffffff;
      border-radius: 5px;
      cursor: pointer;
      font-size: 15px;
      line-height: 1;
      color: var(--navy-dark);
      vertical-align: middle;
    }
    .cart-step:hover { background-color: var(--teal-card); color: #ffffff; border-color: var(--teal-card); }
    .cart-qty {
      display: inline-block;
      min-width: 26px;
      text-align: center;
      font-weight: 600;
      vertical-align: middle;
    }