Fix material usage logging: remaining weight mode, edit modal, and consolidate duplicate logic

- InventoryController: extract RecordInventoryUsageAsync helper; both LogUsage
  (scan page) and LogMaterial (jobs modal, moved from JobsController) call it —
  no more duplicate save/GL logic across two controllers
- Log Material modal: replace radio buttons with prominent toggle buttons so the
  active mode (Amount Used vs Amount Remaining) is always visually obvious; add
  always-visible preview line showing exactly what will be logged before saving
- Edit Usage modal: add quantity field (pre-populated from existing transaction)
  with delta adjustment to InventoryItem.QuantityOnHand on save; include
  completed/terminal jobs in the dropdown so entries can be corrected after a
  job is marked done
- Scan page job picker: include jobs completed within the last 7 days (marked
  with '(completed)') so usage can be logged after a job is finished

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/PowderCoating.Web/Controllers/InventoryController.cs

@@ -1642,8 +1642,10 @@ public class InventoryController : Controller
 
         var userId = _userManager.GetUserId(User);
 
+        var recentCutoff = DateTime.UtcNow.AddDays(-7);
+
         var myJobs = (await _unitOfWork.Jobs.FindAsync(
-                j => !j.JobStatus.IsTerminalStatus && j.AssignedUserId == userId,
+                j => (!j.JobStatus.IsTerminalStatus || j.UpdatedAt >= recentCutoff) && j.AssignedUserId == userId,
                 false,
                 j => j.Customer,
                 j => j.JobStatus))
@@ -1651,7 +1653,7 @@ public class InventoryController : Controller
             .Select(j => new ScanJobOption
             {
                 Id = j.Id,
-                JobNumber = j.JobNumber,
+                JobNumber = j.JobNumber + (j.JobStatus.IsTerminalStatus ? " (completed)" : ""),
                 CustomerName = j.Customer != null
                     ? (j.Customer.CompanyName ?? j.Customer.ContactFirstName + " " + j.Customer.ContactLastName)
                     : "No Customer"
@@ -1660,7 +1662,7 @@ public class InventoryController : Controller
 
         var myJobIds = myJobs.Select(j => j.Id).ToHashSet();
         var otherJobs = (await _unitOfWork.Jobs.FindAsync(
-                j => !j.JobStatus.IsTerminalStatus && !myJobIds.Contains(j.Id),
+                j => (!j.JobStatus.IsTerminalStatus || j.UpdatedAt >= recentCutoff) && !myJobIds.Contains(j.Id),
                 false,
                 j => j.Customer,
                 j => j.JobStatus))
@@ -1669,7 +1671,7 @@ public class InventoryController : Controller
             .Select(j => new ScanJobOption
             {
                 Id = j.Id,
-                JobNumber = j.JobNumber,
+                JobNumber = j.JobNumber + (j.JobStatus.IsTerminalStatus ? " (completed)" : ""),
                 CustomerName = j.Customer != null
                     ? (j.Customer.CompanyName ?? j.Customer.ContactFirstName + " " + j.Customer.ContactLastName)
                     : "No Customer"
@@ -1686,9 +1688,64 @@ public class InventoryController : Controller
     }
 
     /// <summary>
-    /// Records powder usage logged via the mobile scan page. Creates a JobUsage
-    /// InventoryTransaction (and PowderUsageLog) when a job is selected, or an
-    /// Adjustment transaction when logging without a job. Updates QuantityOnHand.
+    /// Core inventory usage recording logic shared by LogUsage (scan page) and LogMaterial (modal).
+    /// Deducts quantityUsed from QuantityOnHand, writes an InventoryTransaction, and posts GL entries.
+    /// </summary>
+    private async Task<InventoryUsageResult> RecordInventoryUsageAsync(
+        int inventoryItemId, int? jobId, decimal quantityUsed,
+        InventoryTransactionType transactionType, string? notes)
+    {
+        var item = await _unitOfWork.InventoryItems.GetByIdAsync(inventoryItemId);
+        if (item == null)
+            return new InventoryUsageResult(false, "Inventory item not found.", 0, "", "");
+
+        string? reference = null;
+        if (jobId.HasValue)
+        {
+            var job = await _unitOfWork.Jobs.GetByIdAsync(jobId.Value);
+            reference = job != null ? $"Job {job.JobNumber}" : null;
+        }
+
+        item.QuantityOnHand -= quantityUsed;
+        item.UpdatedAt = DateTime.UtcNow;
+        await _unitOfWork.InventoryItems.UpdateAsync(item);
+
+        var txn = new InventoryTransaction
+        {
+            InventoryItemId = item.Id,
+            TransactionType = transactionType,
+            Quantity        = -quantityUsed,
+            UnitCost        = item.UnitCost,
+            TotalCost       = quantityUsed * item.UnitCost,
+            TransactionDate = DateTime.UtcNow,
+            BalanceAfter    = item.QuantityOnHand,
+            JobId           = jobId,
+            Reference       = reference,
+            Notes           = notes?.Trim(),
+            CompanyId       = item.CompanyId,
+            CreatedAt       = DateTime.UtcNow
+        };
+        await _unitOfWork.InventoryTransactions.AddAsync(txn);
+        await _unitOfWork.CompleteAsync();
+
+        if (item.CogsAccountId.HasValue && item.InventoryAccountId.HasValue)
+        {
+            var cost = quantityUsed * (item.AverageCost > 0 ? item.AverageCost : item.UnitCost);
+            await _accountBalanceService.DebitAsync(item.CogsAccountId, cost);
+            await _accountBalanceService.CreditAsync(item.InventoryAccountId, cost);
+        }
+
+        return new InventoryUsageResult(
+            true,
+            $"Logged {quantityUsed:N2} {item.UnitOfMeasure} of {item.Name}. New balance: {item.QuantityOnHand:N2} {item.UnitOfMeasure}.",
+            item.QuantityOnHand,
+            item.UnitOfMeasure,
+            item.Name);
+    }
+
+    /// <summary>
+    /// Records powder usage from the mobile scan page. Resolves the used quantity
+    /// (caller already converts "remaining weight" to delta before posting) and redirects to ScanSuccess.
     /// </summary>
     [HttpPost]
     [ValidateAntiForgeryToken]
@@ -1697,55 +1754,26 @@ public class InventoryController : Controller
     {
         try
         {
-            var item = await _unitOfWork.InventoryItems.GetByIdAsync(inventoryItemId);
-            if (item == null) return NotFound();
-
             if (quantity <= 0)
             {
                 TempData["ScanError"] = "Quantity must be greater than zero.";
                 return RedirectToAction(nameof(Scan), new { id = inventoryItemId });
             }
 
-            var userId = _userManager.GetUserId(User) ?? string.Empty;
-            // Scan-based logging always records as JobUsage; Adjustment is for manual stock corrections only
-            var txnType = InventoryTransactionType.JobUsage;
+            var result = await RecordInventoryUsageAsync(
+                inventoryItemId, jobId, quantity,
+                InventoryTransactionType.JobUsage, notes);
 
-            item.QuantityOnHand -= quantity;
-            item.UpdatedAt = DateTime.UtcNow;
-            await _unitOfWork.InventoryItems.UpdateAsync(item);
-
-            var txn = new InventoryTransaction
+            if (!result.Success)
             {
-                InventoryItemId = item.Id,
-                TransactionType = txnType,
-                Quantity = -quantity,
-                UnitCost = item.UnitCost,
-                TotalCost = quantity * item.UnitCost,
-                TransactionDate = DateTime.UtcNow,
-                BalanceAfter = item.QuantityOnHand,
-                JobId = jobId,
-                Reference = jobId.HasValue ? $"Job #{jobId}" : null,
-                Notes = notes?.Trim()
-            };
-            await _unitOfWork.InventoryTransactions.AddAsync(txn);
-            await _unitOfWork.SaveChangesAsync();
-
-            // GL: DR COGS, CR Inventory Asset — no-op if accounts not configured on the item
-            if (item.CogsAccountId.HasValue && item.InventoryAccountId.HasValue)
-            {
-                var cost = quantity * (item.AverageCost > 0 ? item.AverageCost : item.UnitCost);
-                await _accountBalanceService.DebitAsync(item.CogsAccountId, cost);
-                await _accountBalanceService.CreditAsync(item.InventoryAccountId, cost);
+                TempData["ScanError"] = result.Message;
+                return RedirectToAction(nameof(Scan), new { id = inventoryItemId });
             }
 
-            // PowderUsageLog requires a specific JobItem + Coat FK — scan-based logging
-            // doesn't have that context, so we rely on the InventoryTransaction alone
-            // for the audit trail. Coat-level PowderUsageLogs are created by the job workflow.
-
-            TempData["ScanSuccess"]  = $"Logged {quantity:N2} {item.UnitOfMeasure} of {item.Name}. New balance: {item.QuantityOnHand:N2} {item.UnitOfMeasure}.";
+            TempData["ScanSuccess"]  = result.Message;
             TempData["ScanItemId"]   = inventoryItemId.ToString();
             TempData["ScanJobId"]    = jobId?.ToString();
-            TempData["ScanItemName"] = item.Name;
+            TempData["ScanItemName"] = result.ItemName;
             return RedirectToAction(nameof(ScanSuccess));
         }
         catch (Exception ex)
@@ -1756,6 +1784,43 @@ public class InventoryController : Controller
         }
     }
 
+    /// <summary>
+    /// Records manual material usage from the job details modal. Accepts JSON, resolves
+    /// the amount used (caller sends the already-computed used quantity), and returns JSON
+    /// so the modal can close and refresh inline.
+    /// </summary>
+    [HttpPost]
+    [ValidateAntiForgeryToken]
+    public async Task<IActionResult> LogMaterial([FromBody] LogMaterialRequest req)
+    {
+        try
+        {
+            if (req.QuantityUsed <= 0)
+                return Json(new { success = false, message = "Quantity used must be greater than zero." });
+
+            var txnType = req.TransactionType == "Waste"
+                ? InventoryTransactionType.Waste
+                : InventoryTransactionType.JobUsage;
+
+            var result = await RecordInventoryUsageAsync(
+                req.InventoryItemId, req.JobId, req.QuantityUsed, txnType, req.Notes);
+
+            return Json(new
+            {
+                success       = result.Success,
+                message       = result.Message,
+                newBalance    = result.NewBalance,
+                unitOfMeasure = result.UnitOfMeasure,
+                itemName      = result.ItemName
+            });
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Error logging material for job {JobId}", req.JobId);
+            return Json(new { success = false, message = "An error occurred. Please try again." });
+        }
+    }
+
     /// <summary>
     /// Success screen shown after a usage log is saved. Offers "Log Another Item for
     /// This Job" and "Done" options.
@@ -2003,7 +2068,7 @@ public class InventoryController : Controller
 
     /// <summary>
     /// Returns the current values of a JobUsage InventoryTransaction plus a list of active
-    /// jobs so the edit modal can be pre-populated without a full page reload.
+    /// jobs (plus the currently assigned job even if terminal) for the edit modal.
     /// </summary>
     [HttpGet]
     public async Task<IActionResult> GetUsageForEdit(int id)
@@ -2034,10 +2099,27 @@ public class InventoryController : Controller
             })
             .ToList();
 
+        // If the assigned job has terminal status it won't appear in the active list; insert it at the top
+        // so the dropdown pre-selects correctly and the user can see the existing job assignment.
+        if (txn.JobId.HasValue && jobs.All(j => j.Id != txn.JobId.Value))
+        {
+            var assignedJob = await _unitOfWork.Jobs.GetByIdAsync(txn.JobId.Value, false, j => j.Customer);
+            if (assignedJob != null)
+                jobs.Insert(0, new ScanJobOption
+                {
+                    Id = assignedJob.Id,
+                    JobNumber = assignedJob.JobNumber,
+                    CustomerName = assignedJob.Customer != null
+                        ? (assignedJob.Customer.CompanyName ?? $"{assignedJob.Customer.ContactFirstName} {assignedJob.Customer.ContactLastName}".Trim())
+                        : "No Customer"
+                });
+        }
+
         return Json(new
         {
             transactionId = txn.Id,
             jobId = txn.JobId,
+            quantity = Math.Abs(txn.Quantity),
             notes = txn.Notes,
             transactionDate = txn.TransactionDate.ToString("yyyy-MM-ddTHH:mm"),
             itemName = txn.InventoryItem?.Name,
@@ -2046,14 +2128,15 @@ public class InventoryController : Controller
     }
 
     /// <summary>
-    /// Saves edits to a JobUsage InventoryTransaction's job assignment, notes, and date.
-    /// Quantity and balance are not changed.
+    /// Saves edits to a JobUsage InventoryTransaction: job assignment, quantity, notes, and date.
+    /// When quantity changes the InventoryItem.QuantityOnHand is adjusted by the delta so the
+    /// ledger balance remains consistent.
     /// </summary>
     [HttpPost]
     [ValidateAntiForgeryToken]
-    public async Task<IActionResult> EditUsageTransaction(int id, int? jobId, string? notes, DateTime transactionDate)
+    public async Task<IActionResult> EditUsageTransaction(int id, int? jobId, string? notes, DateTime transactionDate, decimal? quantity)
     {
-        var txn = await _unitOfWork.InventoryTransactions.GetByIdAsync(id);
+        var txn = await _unitOfWork.InventoryTransactions.GetByIdAsync(id, false, t => t.InventoryItem);
         if (txn == null) return NotFound();
         if (txn.TransactionType != InventoryTransactionType.JobUsage
             && txn.TransactionType != InventoryTransactionType.Adjustment)
@@ -2075,6 +2158,28 @@ public class InventoryController : Controller
         if (jobId.HasValue && txn.TransactionType == InventoryTransactionType.Adjustment)
             txn.TransactionType = InventoryTransactionType.JobUsage;
 
+        // Adjust inventory when the logged quantity is changed.
+        // txn.Quantity is stored as a negative number for usage (e.g. -3.5 for 3.5 lbs used).
+        if (quantity.HasValue && quantity.Value > 0)
+        {
+            var oldUsed = Math.Abs(txn.Quantity);
+            var newUsed = quantity.Value;
+            if (oldUsed != newUsed)
+            {
+                var item = txn.InventoryItem ?? await _unitOfWork.InventoryItems.GetByIdAsync(txn.InventoryItemId);
+                if (item != null)
+                {
+                    // Positive delta means less was actually used → restore the difference to inventory.
+                    item.QuantityOnHand += oldUsed - newUsed;
+                    item.UpdatedAt = DateTime.UtcNow;
+                    await _unitOfWork.InventoryItems.UpdateAsync(item);
+                    txn.BalanceAfter = item.QuantityOnHand;
+                }
+                txn.Quantity = -newUsed;
+                txn.TotalCost = newUsed * txn.UnitCost;
+            }
+        }
+
         txn.Notes = notes?.Trim();
         txn.TransactionDate = transactionDate.Kind == DateTimeKind.Utc
             ? transactionDate : DateTime.SpecifyKind(transactionDate, DateTimeKind.Utc);
@@ -2094,3 +2199,21 @@ public class ScanJobOption
     public string JobNumber { get; set; } = string.Empty;
     public string CustomerName { get; set; } = string.Empty;
 }
+
+/// <summary>Result returned by RecordInventoryUsageAsync.</summary>
+public record InventoryUsageResult(
+    bool Success,
+    string Message,
+    decimal NewBalance,
+    string UnitOfMeasure,
+    string ItemName);
+
+/// <summary>JSON body for the LogMaterial endpoint (job details modal).</summary>
+public class LogMaterialRequest
+{
+    public int     JobId           { get; set; }
+    public int     InventoryItemId { get; set; }
+    public decimal QuantityUsed    { get; set; }
+    public string  TransactionType { get; set; } = "JobUsage";
+    public string? Notes           { get; set; }
+}

src/PowderCoating.Web/Controllers/JobsController.cs

@@ -4399,75 +4399,7 @@ public class JobsController : Controller
         _logger.LogInformation("Recorded first job creation for company {CompanyId}", companyId);
     }
 
-    /// <summary>
-    /// Logs manual material usage from the job details page. Mirrors the QR scan LogUsage
-    /// flow in InventoryController but returns JSON so the modal can close and refresh inline.
-    /// Quantity is always the amount USED (caller converts from remaining if needed).
-    /// </summary>
-    [HttpPost]
-    [ValidateAntiForgeryToken]
-    public async Task<IActionResult> LogMaterial([FromBody] LogMaterialRequest req)
-    {
-        try
-        {
-            if (req.QuantityUsed <= 0)
-                return Json(new { success = false, message = "Quantity used must be greater than zero." });
-
-            var item = await _unitOfWork.InventoryItems.GetByIdAsync(req.InventoryItemId);
-            if (item == null) return Json(new { success = false, message = "Inventory item not found." });
-
-            var job = await _unitOfWork.Jobs.GetByIdAsync(req.JobId);
-            if (job == null) return Json(new { success = false, message = "Job not found." });
-
-            var txnType = req.TransactionType == "Waste"
-                ? InventoryTransactionType.Waste
-                : InventoryTransactionType.JobUsage;
-
-            item.QuantityOnHand -= req.QuantityUsed;
-            item.UpdatedAt = DateTime.UtcNow;
-            await _unitOfWork.InventoryItems.UpdateAsync(item);
-
-            var txn = new PowderCoating.Core.Entities.InventoryTransaction
-            {
-                InventoryItemId = item.Id,
-                TransactionType = txnType,
-                Quantity        = -req.QuantityUsed,
-                UnitCost        = item.UnitCost,
-                TotalCost       = req.QuantityUsed * item.UnitCost,
-                TransactionDate = DateTime.UtcNow,
-                BalanceAfter    = item.QuantityOnHand,
-                JobId           = req.JobId,
-                Reference       = $"Job {job.JobNumber}",
-                Notes           = req.Notes?.Trim(),
-                CompanyId       = item.CompanyId,
-                CreatedAt       = DateTime.UtcNow
-            };
-            await _unitOfWork.InventoryTransactions.AddAsync(txn);
-            await _unitOfWork.CompleteAsync();
-
-            // GL: DR COGS, CR Inventory Asset
-            if (item.CogsAccountId.HasValue && item.InventoryAccountId.HasValue)
-            {
-                var cost = req.QuantityUsed * (item.AverageCost > 0 ? item.AverageCost : item.UnitCost);
-                await _accountBalanceService.DebitAsync(item.CogsAccountId, cost);
-                await _accountBalanceService.CreditAsync(item.InventoryAccountId, cost);
-            }
-
-            return Json(new
-            {
-                success    = true,
-                message    = $"Logged {req.QuantityUsed:N2} {item.UnitOfMeasure} of {item.Name}.",
-                newBalance = item.QuantityOnHand,
-                unitOfMeasure = item.UnitOfMeasure,
-                itemName   = item.Name
-            });
-        }
-        catch (Exception ex)
-        {
-            _logger.LogError(ex, "Error logging material for job {JobId}", req.JobId);
-            return Json(new { success = false, message = "An error occurred. Please try again." });
-        }
-    }
+    // LogMaterial has been consolidated into InventoryController.LogMaterial.
 
     /// <summary>
     /// Inline-edits description, quantity, and unit price on a single job line item.
@@ -4554,14 +4486,6 @@ public class PatchJobItemRequest
     public decimal Quantity    { get; set; }
     public decimal UnitPrice   { get; set; }
 }
-public class LogMaterialRequest
-{
-    public int     JobId           { get; set; }
-    public int     InventoryItemId { get; set; }
-    public decimal QuantityUsed    { get; set; }
-    public string  TransactionType { get; set; } = "JobUsage";
-    public string? Notes           { get; set; }
-}
 public class CreateReworkJobRequest
 {
     public int ReworkRecordId { get; set; }

src/PowderCoating.Web/Views/Inventory/Ledger.cshtml

@@ -353,6 +353,11 @@
                         <label class="form-label fw-semibold">Powder Item</label>
                         <p id="euItemName" class="form-control-plaintext text-muted"></p>
                     </div>
+                    <div class="mb-3">
+                        <label for="euQuantity" class="form-label fw-semibold">Amount Used <small class="text-muted fw-normal" id="euQuantityUom"></small></label>
+                        <input type="number" id="euQuantity" name="quantity" class="form-control" min="0.001" step="any" required />
+                        <div class="form-text">Adjusts the inventory balance by the difference from the original entry.</div>
+                    </div>
                     <div class="mb-3">
                         <label for="euJobId" class="form-label fw-semibold">Job <span class="text-muted fw-normal">(optional)</span></label>
                         <select id="euJobId" name="jobId" class="form-select">

src/PowderCoating.Web/Views/Jobs/Details.cshtml

@@ -1158,21 +1158,24 @@
                                 </div>
                                 <div class="mb-3">
                                     <label class="form-label fw-semibold">Entry Method</label>
-                                    <div class="d-flex gap-3">
-                                        <div class="form-check">
-                                            <input class="form-check-input" type="radio" name="lmEntryMethod" id="lmMethodUsed" value="used" checked onchange="lmUpdateQuantityLabel()">
-                                            <label class="form-check-label" for="lmMethodUsed">Amount Used</label>
-                                        </div>
-                                        <div class="form-check">
-                                            <input class="form-check-input" type="radio" name="lmEntryMethod" id="lmMethodRemaining" value="remaining" onchange="lmUpdateQuantityLabel()">
-                                            <label class="form-check-label" for="lmMethodRemaining">Amount Remaining</label>
-                                        </div>
+                                    <div class="btn-group w-100" role="group">
+                                        <button type="button" id="lmBtnUsed" class="btn btn-primary"
+                                                onclick="lmSetMethod('used')">
+                                            <i class="bi bi-droplet me-1"></i>Amount Used
+                                        </button>
+                                        <button type="button" id="lmBtnRemaining" class="btn btn-outline-primary"
+                                                onclick="lmSetMethod('remaining')">
+                                            <i class="bi bi-droplet-half me-1"></i>Amount Remaining
+                                        </button>
+                                    </div>
+                                    <div class="form-text">
+                                        <span id="lmMethodHint">Enter how much powder you took out of the bag.</span>
                                     </div>
                                 </div>
                                 <div class="mb-3">
                                     <label id="lmQtyLabel" class="form-label fw-semibold">Quantity Used <span class="text-danger">*</span></label>
                                     <input type="number" id="lmQuantity" class="form-control" min="0" step="0.01" placeholder="0.00">
-                                    <div id="lmComputedUsed" class="form-text text-muted d-none"></div>
+                                    <div id="lmComputedUsed" class="form-text fw-semibold d-none"></div>
                                 </div>
                                 <div class="mb-3">
                                     <label class="form-label fw-semibold">Reason</label>
@@ -3311,7 +3314,7 @@
     const inventoryItems = @Html.Raw(ViewBag.InventoryItemsForModal ?? "[]");
     const jobPowderIds  = @Html.Raw(ViewBag.JobPowderIds ?? "[]");
     const jobId = @Model.Id;
-    const logUrl = '@Url.Action("LogMaterial", "Jobs")';
+    const logUrl = '@Url.Action("LogMaterial", "Inventory")';
     const token = document.querySelector('input[name="__RequestVerificationToken"]')?.value ?? '';
     window.__logMaterial = { inventoryItems, jobPowderIds, jobId, logUrl, token };
 })();

src/PowderCoating.Web/wwwroot/js/inventory-ledger.js

@@ -18,6 +18,7 @@ async function openUsageEdit(transactionId) {
 
         document.getElementById('euTxnId').value = data.transactionId;
         document.getElementById('euItemName').textContent = data.itemName || '—';
+        document.getElementById('euQuantity').value = data.quantity != null ? parseFloat(data.quantity).toFixed(4) : '';
         document.getElementById('euDate').value = data.transactionDate;
         document.getElementById('euNotes').value = data.notes || '';
 
@@ -54,6 +55,7 @@ document.getElementById('euSaveBtn').addEventListener('click', async () => {
     const token = form.querySelector('input[name="__RequestVerificationToken"]')?.value;
     const params = new URLSearchParams({
         id: document.getElementById('euTxnId').value,
+        quantity: document.getElementById('euQuantity').value,
         jobId: document.getElementById('euJobId').value,
         notes: document.getElementById('euNotes').value,
         transactionDate: document.getElementById('euDate').value,

src/PowderCoating.Web/wwwroot/js/log-material.js

@@ -6,9 +6,64 @@
     let _items = [];
     let _jobPowderIds = new Set();
     let _modal = null;
+    let _selectedItemId = 0;
+    let _entryMethod = 'used'; // 'used' | 'remaining'
+
+    // ── Mode toggle ───────────────────────────────────────────────────────────
+
+    window.lmSetMethod = function (method) {
+        _entryMethod = method;
+        const btnUsed      = document.getElementById('lmBtnUsed');
+        const btnRemaining = document.getElementById('lmBtnRemaining');
+        const hintEl       = document.getElementById('lmMethodHint');
+        const qtyLabel     = document.getElementById('lmQtyLabel');
+
+        if (method === 'remaining') {
+            btnUsed.className      = 'btn btn-outline-primary';
+            btnRemaining.className = 'btn btn-primary';
+            hintEl.textContent     = 'Enter how much is LEFT in the bag — the system calculates what was used.';
+            qtyLabel.innerHTML     = 'Weight Remaining in Bag <span class="text-danger">*</span>';
+        } else {
+            btnUsed.className      = 'btn btn-primary';
+            btnRemaining.className = 'btn btn-outline-primary';
+            hintEl.textContent     = 'Enter how much powder you took out of the bag.';
+            qtyLabel.innerHTML     = 'Quantity Used <span class="text-danger">*</span>';
+        }
+        lmUpdatePreview();
+    };
+
+    // ── Live preview (always visible once qty + item are set) ─────────────────
+
+    function lmUpdatePreview() {
+        const computedDiv = document.getElementById('lmComputedUsed');
+        if (!_selectedItemId || !computedDiv) { computedDiv?.classList.add('d-none'); return; }
+        const item   = _items.find(it => it.id === _selectedItemId);
+        const onHand = item ? (parseFloat(item.quantityOnHand) || 0) : 0;
+        const qty    = parseFloat(document.getElementById('lmQuantity').value) || 0;
+        if (qty <= 0) { computedDiv.classList.add('d-none'); return; }
+
+        const uom = item?.unitOfMeasure || '';
+        if (_entryMethod === 'remaining') {
+            const used = onHand - qty;
+            if (used <= 0) {
+                computedDiv.className = 'form-text fw-semibold text-danger';
+                computedDiv.textContent = 'Remaining cannot be ≥ current stock (' + onHand.toFixed(2) + ' ' + uom + ').';
+            } else {
+                computedDiv.className = 'form-text fw-semibold text-success';
+                computedDiv.textContent =
+                    'Will log ' + used.toFixed(2) + ' ' + uom + ' used  —  new balance: ' + qty.toFixed(2) + ' ' + uom;
+            }
+        } else {
+            const newBal = onHand - qty;
+            const col = newBal < 0 ? 'text-danger' : 'text-success';
+            computedDiv.className = 'form-text fw-semibold ' + col;
+            computedDiv.textContent =
+                'Will log ' + qty.toFixed(2) + ' ' + uom + ' used  —  new balance: ' + newBal.toFixed(2) + ' ' + uom;
+        }
+        computedDiv.classList.remove('d-none');
+    }
 
     // ── Combobox state ────────────────────────────────────────────────────────
-    let _selectedItemId = 0;
 
     function lmComboInput() {
         const q = document.getElementById('lmItemSearch')?.value?.toLowerCase() || '';
@@ -16,7 +71,7 @@
         lmComboShow();
         _selectedItemId = 0;
         document.getElementById('lmItemBalance').classList.add('d-none');
-        lmOnQtyInput();
+        lmUpdatePreview();
     }
 
     function lmComboOpen() {
@@ -111,7 +166,7 @@
         const balDiv = document.getElementById('lmItemBalance');
         balDiv.textContent = 'Current stock: ' + qty.toFixed(2) + (uom ? ' ' + uom : '');
         balDiv.classList.remove('d-none');
-        lmOnQtyInput();
+        lmUpdatePreview();
     };
 
     window.lmComboInput  = lmComboInput;
@@ -152,39 +207,14 @@
         return String(s).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;');
     }
 
-    // ── Quantity / label logic ────────────────────────────────────────────────
-
-    function lmOnQtyInput() {
-        const method = document.querySelector('input[name="lmEntryMethod"]:checked')?.value;
-        if (method !== 'remaining') {
-            document.getElementById('lmComputedUsed').classList.add('d-none');
-            return;
-        }
-        if (!_selectedItemId) {
-            document.getElementById('lmComputedUsed').classList.add('d-none');
-            return;
-        }
-        const item = _items.find(it => it.id === _selectedItemId);
-        const onHand = item ? (parseFloat(item.quantityOnHand) || 0) : 0;
-        const remaining = parseFloat(document.getElementById('lmQuantity').value) || 0;
-        const used = onHand - remaining;
-        const computedDiv = document.getElementById('lmComputedUsed');
-        computedDiv.textContent = 'Usage = ' + onHand.toFixed(2) + ' − ' + remaining.toFixed(2) + ' = ' + used.toFixed(2) + (item?.unitOfMeasure ? ' ' + item.unitOfMeasure : '');
-        computedDiv.classList.remove('d-none');
-    }
-
-    window.lmUpdateQuantityLabel = function () {
-        const method = document.querySelector('input[name="lmEntryMethod"]:checked')?.value;
-        document.getElementById('lmQtyLabel').innerHTML =
-            (method === 'remaining' ? 'Quantity Remaining' : 'Quantity Used') +
-            ' <span class="text-danger">*</span>';
-        lmOnQtyInput();
-    };
+    // ── Kept for backward-compat with any inline onchange handlers that may exist ─
+    window.lmUpdateQuantityLabel = function () { lmUpdatePreview(); };
 
     // ── Modal open / save ─────────────────────────────────────────────────────
 
     window.openLogMaterialModal = function () {
         _selectedItemId = 0;
+        _entryMethod    = 'used';
         document.getElementById('lmItemSearch').value = '';
         document.getElementById('lmItemBalance').classList.add('d-none');
         document.getElementById('lmQuantity').value = '';
@@ -193,8 +223,7 @@
         document.getElementById('lmNotes').value = '';
         document.getElementById('lmAlert').classList.add('d-none');
         document.getElementById('lmSaveBtn').disabled = false;
-        document.getElementById('lmMethodUsed').checked = true;
-        window.lmUpdateQuantityLabel();
+        lmSetMethod('used');
         lmComboClose();
         if (_modal) _modal.show();
     };
@@ -214,14 +243,14 @@
         const qtyInput = parseFloat(document.getElementById('lmQuantity').value) || 0;
         if (qtyInput <= 0) { showError('Please enter a quantity greater than zero.'); return; }
 
-        const method = document.querySelector('input[name="lmEntryMethod"]:checked')?.value;
+        const item   = _items.find(it => it.id === _selectedItemId);
+        const onHand = item ? (parseFloat(item.quantityOnHand) || 0) : 0;
+
         let quantityUsed = qtyInput;
-        if (method === 'remaining') {
-            const item = _items.find(it => it.id === _selectedItemId);
-            const onHand = item ? (parseFloat(item.quantityOnHand) || 0) : 0;
+        if (_entryMethod === 'remaining') {
             quantityUsed = onHand - qtyInput;
             if (quantityUsed <= 0) {
-                showError('Remaining quantity cannot be equal to or greater than the current stock (' + onHand.toFixed(2) + ').');
+                showError('Remaining cannot be equal to or greater than the current stock (' + onHand.toFixed(2) + ').');
                 return;
             }
         }
@@ -269,9 +298,8 @@
         _jobPowderIds = new Set(cfg.jobPowderIds || []);
         _modal = new bootstrap.Modal(document.getElementById('logMaterialModal'));
 
-        document.getElementById('lmQuantity').addEventListener('input', lmOnQtyInput);
+        document.getElementById('lmQuantity').addEventListener('input', lmUpdatePreview);
 
-        // Close dropdown when clicking outside
         document.addEventListener('click', function (e) {
             if (!e.target.closest('#lmItemSearch') &&
                 !e.target.closest('#lmItemDropdown') &&