diff --git a/components/admin/autosave-status.tsx b/components/admin/autosave-status.tsx
index 2bbfbae..bbd2944 100644
--- a/components/admin/autosave-status.tsx
+++ b/components/admin/autosave-status.tsx
@@ -1,7 +1,7 @@
 import { AlertCircleIcon, CheckIcon, ClockIcon } from "lucide-react";
 import { useState } from "react";
 
-import { Alert, AlertDescription } from "@/components/ui/alert";
+import { Alert, AlertDescription, AlertTitle } from "@/components/ui/alert";
 import { Badge } from "@/components/ui/badge";
 import { Button } from "@/components/ui/button";
 import { Spinner } from "@/components/ui/spinner";
@@ -14,13 +14,14 @@ export function AutosaveStatus({ state, issues = [], onSave }: { state: Autosave
   if (state === "unsaved") return <Badge variant="outline"><ClockIcon data-icon="inline-start" />Waiting to save…</Badge>;
   if (state === "incomplete") return <div className="flex flex-col items-end gap-2">
     <Button type="button" variant="outline" size="sm" onClick={() => setShowIssues((current) => !current)} aria-expanded={showIssues}>
-      <AlertCircleIcon data-icon="inline-start" />{showIssues ? "Hide incomplete fields" : "Check incomplete fields"}
+      <AlertCircleIcon data-icon="inline-start" />{showIssues ? "ซ่อนรายการ" : "ตรวจสอบข้อมูลที่ยังไม่ครบ"}
     </Button>
     {showIssues ? <Alert variant="destructive" className="max-w-md">
       <AlertCircleIcon aria-hidden="true" />
+      <AlertTitle>กรุณากรอกข้อมูลให้ครบ</AlertTitle>
       <AlertDescription>
         <div className="flex flex-col gap-2">
-          <p>Local draft ถูกเก็บไว้แล้ว และจะบันทึกอัตโนมัติเมื่อข้อมูลครบ</p>
+          <p>แก้ไขรายการด้านล่าง แล้วระบบจะบันทึกให้อัตโนมัติ ข้อมูลที่กรอกไว้ยังไม่หาย</p>
           {issues.length ? <ul className="flex flex-col gap-1">{issues.map((issue, index) => <li key={`${issue}-${index}`}>{issue}</li>)}</ul> : null}
         </div>
       </AlertDescription>
diff --git a/components/admin/guide-overview-form.tsx b/components/admin/guide-overview-form.tsx
index 489a6be..b43fba8 100644
--- a/components/admin/guide-overview-form.tsx
+++ b/components/admin/guide-overview-form.tsx
@@ -17,8 +17,8 @@ export function GuideOverviewForm({ guide }: { guide: { id: string; version: num
   const [cover, setCover] = useState({ id: guide.coverMediaId, url: guide.coverUrl });
   const value = { coverMediaId: cover.id, overview };
   const incompleteIssues = [
-    !cover.id ? "Guide Image is required" : null,
-    !overview.trim() ? "Overview is required" : null,
+    !cover.id ? "กรุณาอัปโหลด Guide Image" : null,
+    !overview.trim() ? "กรุณากรอก Overview" : null,
   ].filter((issue): issue is string => Boolean(issue));
   const localDraft = { overview, cover };
   const autosave = useAutosave({
diff --git a/components/admin/guide-section-editor.tsx b/components/admin/guide-section-editor.tsx
index 87e3e17..103ce6a 100644
--- a/components/admin/guide-section-editor.tsx
+++ b/components/admin/guide-section-editor.tsx
@@ -93,6 +93,8 @@ import {
   type TalentPriority,
   type TalentRelation,
 } from "@/lib/guides/talents";
+import { finalizePercentInput, normalizePercentInput } from "@/lib/guides/percent-input";
+import { formatGuideValidationIssues } from "@/lib/guides/validation-messages";
 import { cn } from "@/lib/utils";
 
 type CatalogItem = { key: string; name: string; imageUrl: string; rarity?: number | null; weaponType?: string | null };
@@ -357,12 +359,12 @@ function WeaponEditor({ guide, weapons, characters, initial }: EditorBase) {
         <DndContext sensors={weaponSensors} collisionDetection={closestCenter} onDragEnd={handleWeaponDragEnd}>
           <SortableContext items={rows.map((row) => row.clientId)} strategy={verticalListSortingStrategy}>
             <div className="flex flex-col gap-4">
-              {rows.map((row, rowIndex) => { const selectedWeapon = compatibleWeapons.find((weapon) => weapon.key === row.weaponKey); return <SortableWeaponCard key={row.clientId} id={row.clientId}>{(dragHandle) => <Card size="sm"><CardHeader><CardTitle className="flex items-center gap-3">{selectedWeapon ? <div className={cn("relative size-10 shrink-0 overflow-hidden rounded-lg", rarityGradientClass(selectedWeapon.rarity))}><Image src={selectedWeapon.imageUrl} alt="" fill className="object-contain" /></div> : null}<span>อันดับ {rowIndex + 1}</span></CardTitle><CardAction><div className="flex gap-1">{dragHandle}<DeleteConfirmationDialog trigger={<Button type="button" variant="ghost" size="icon-sm" />} title={`ลบ ${selectedWeapon?.name ?? `อาวุธอันดับ ${rowIndex + 1}`}?`} description="รายการอาวุธและเปอร์เซ็นต์เปรียบเทียบจะถูกลบออกจาก Guide" onConfirm={() => setRows(rows.filter((item) => item.clientId !== row.clientId))}><Trash2Icon /><span className="sr-only">ลบอาวุธ</span></DeleteConfirmationDialog></div></CardAction></CardHeader><CardContent><FieldGroup><div className="grid grid-cols-[minmax(0,1fr)_auto] items-end gap-4"><Field className="min-w-0"><FieldLabel>อาวุธ</FieldLabel><CatalogPicker items={compatibleWeapons} value={row.weaponKey} placeholder="ค้นหาชื่ออาวุธ…" rarityBackground onChange={(weaponKey) => setRows(rows.map((item) => item.clientId === row.clientId ? { ...item, weaponKey } : item))} /></Field><Field className="shrink-0"><FieldLabel>Refinement</FieldLabel><ToggleGroup variant="outline" value={[`R${row.refinement}`]} onValueChange={(selected) => { const next = selected[0]; if (next) setRows(rows.map((item) => item.clientId === row.clientId ? { ...item, refinement: Number(next.slice(1)) } : item)); }}>{[1, 2, 3, 4, 5].map((refinement) => <ToggleGroupItem className={SELECTED_TOGGLE_CLASS} key={refinement} value={`R${refinement}`}>R{refinement}</ToggleGroupItem>)}</ToggleGroup></Field></div><div className="grid gap-4 sm:grid-cols-2"><Field><FieldLabel>Overall %</FieldLabel><Input type="number" step="0.01" value={row.overallPercent} onChange={(event) => setRows(rows.map((item) => item.clientId === row.clientId ? { ...item, overallPercent: event.target.value } : item))} /></Field><Field><FieldLabel>Personal %</FieldLabel><Input type="number" step="0.01" value={row.personalPercent} onChange={(event) => setRows(rows.map((item) => item.clientId === row.clientId ? { ...item, personalPercent: event.target.value } : item))} /></Field></div><Field><FieldLabel htmlFor={`weapon-note-${row.clientId}`}>Note (optional)</FieldLabel><Textarea id={`weapon-note-${row.clientId}`} value={row.note} onChange={(event) => setRows(rows.map((item) => item.clientId === row.clientId ? { ...item, note: event.target.value } : item))} /></Field></FieldGroup></CardContent></Card>}</SortableWeaponCard>; })}
+              {rows.map((row, rowIndex) => { const selectedWeapon = compatibleWeapons.find((weapon) => weapon.key === row.weaponKey); return <SortableWeaponCard key={row.clientId} id={row.clientId}>{(dragHandle) => <Card size="sm"><CardHeader><CardTitle className="flex items-center gap-3">{selectedWeapon ? <div className={cn("relative size-10 shrink-0 overflow-hidden rounded-lg", rarityGradientClass(selectedWeapon.rarity))}><Image src={selectedWeapon.imageUrl} alt="" fill className="object-contain" /></div> : null}<span>อันดับ {rowIndex + 1}</span></CardTitle><CardAction><div className="flex gap-1">{dragHandle}<DeleteConfirmationDialog trigger={<Button type="button" variant="ghost" size="icon-sm" />} title={`ลบ ${selectedWeapon?.name ?? `อาวุธอันดับ ${rowIndex + 1}`}?`} description="รายการอาวุธและเปอร์เซ็นต์เปรียบเทียบจะถูกลบออกจาก Guide" onConfirm={() => setRows(rows.filter((item) => item.clientId !== row.clientId))}><Trash2Icon /><span className="sr-only">ลบอาวุธ</span></DeleteConfirmationDialog></div></CardAction></CardHeader><CardContent><FieldGroup><div className="grid grid-cols-[minmax(0,1fr)_auto] items-end gap-4"><Field className="min-w-0"><FieldLabel>อาวุธ</FieldLabel><CatalogPicker items={compatibleWeapons} value={row.weaponKey} placeholder="ค้นหาชื่ออาวุธ…" rarityBackground onChange={(weaponKey) => setRows(rows.map((item) => item.clientId === row.clientId ? { ...item, weaponKey } : item))} /></Field><Field className="shrink-0"><FieldLabel>Refinement</FieldLabel><ToggleGroup variant="outline" value={[`R${row.refinement}`]} onValueChange={(selected) => { const next = selected[0]; if (next) setRows(rows.map((item) => item.clientId === row.clientId ? { ...item, refinement: Number(next.slice(1)) } : item)); }}>{[1, 2, 3, 4, 5].map((refinement) => <ToggleGroupItem className={SELECTED_TOGGLE_CLASS} key={refinement} value={`R${refinement}`}>R{refinement}</ToggleGroupItem>)}</ToggleGroup></Field></div><div className="grid gap-4 sm:grid-cols-2"><Field><FieldLabel>Overall %</FieldLabel><Input type="text" inputMode="decimal" value={row.overallPercent} onChange={(event) => setRows(rows.map((item) => item.clientId === row.clientId ? { ...item, overallPercent: normalizePercentInput(event.target.value, item.overallPercent) } : item))} onBlur={() => setRows(rows.map((item) => item.clientId === row.clientId ? { ...item, overallPercent: finalizePercentInput(item.overallPercent) } : item))} /></Field><Field><FieldLabel>Personal %</FieldLabel><Input type="text" inputMode="decimal" value={row.personalPercent} onChange={(event) => setRows(rows.map((item) => item.clientId === row.clientId ? { ...item, personalPercent: normalizePercentInput(event.target.value, item.personalPercent) } : item))} onBlur={() => setRows(rows.map((item) => item.clientId === row.clientId ? { ...item, personalPercent: finalizePercentInput(item.personalPercent) } : item))} /></Field></div><Field><FieldLabel htmlFor={`weapon-note-${row.clientId}`}>Note (optional)</FieldLabel><Textarea id={`weapon-note-${row.clientId}`} value={row.note} onChange={(event) => setRows(rows.map((item) => item.clientId === row.clientId ? { ...item, note: event.target.value } : item))} /></Field></FieldGroup></CardContent></Card>}</SortableWeaponCard>; })}
             </div>
           </SortableContext>
         </DndContext>
       </CardContent>
-      <CardFooter className="flex-wrap justify-between gap-3"><Button type="button" variant="outline" onClick={() => setRows([...rows, { clientId: createClientId("weapon"), weaponKey: "", refinement: 1, overallPercent: "", personalPercent: "", note: "" }])}><PlusIcon data-icon="inline-start" />เพิ่มอาวุธ</Button><AutosaveStatus state={autosave.state} issues={validation.success ? [] : validation.error.issues.map((issue) => issue.path.length ? `${issue.path.join(".")}: ${issue.message}` : issue.message)} onSave={autosave.saveNow} /></CardFooter>
+      <CardFooter className="flex-wrap justify-between gap-3"><Button type="button" variant="outline" onClick={() => setRows([...rows, { clientId: createClientId("weapon"), weaponKey: "", refinement: 1, overallPercent: "", personalPercent: "", note: "" }])}><PlusIcon data-icon="inline-start" />เพิ่มอาวุธ</Button><AutosaveStatus state={autosave.state} issues={validation.success ? [] : formatGuideValidationIssues("weapon", validation.error.issues)} onSave={autosave.saveNow} /></CardFooter>
     </Card>
   );
 }
@@ -461,7 +463,7 @@ function ArtifactEditor({ guide, artifacts, initial, catalogTalents }: EditorBas
                                 <div className="grid gap-3 lg:grid-cols-[1fr_1fr_8rem_auto]">
                                   <CatalogPicker items={artifacts} value={row.firstArtifactKey} placeholder="ค้นหาชุด Artifact แรก…" rarityBackground showSelectedImage onChange={(firstArtifactKey) => setGroups(groups.map((item, index) => index === groupIndex ? { ...item, rows: item.rows.map((candidate, inner) => inner === rowIndex ? { ...candidate, firstArtifactKey } : candidate) } : item))} />
                                   <CatalogPicker items={artifacts} value={row.secondArtifactKey ?? ""} placeholder="ค้นหาชุดที่สอง (ถ้ามี)…" rarityBackground showSelectedImage onChange={(secondArtifactKey) => setGroups(groups.map((item, index) => index === groupIndex ? { ...item, rows: item.rows.map((candidate, inner) => inner === rowIndex ? { ...candidate, secondArtifactKey: secondArtifactKey || null } : candidate) } : item))} />
-                                  <Input type="number" step="0.01" aria-label="Artifact percent" value={row.percent} onChange={(event) => setGroups(groups.map((item, index) => index === groupIndex ? { ...item, rows: item.rows.map((candidate, inner) => inner === rowIndex ? { ...candidate, percent: event.target.value } : candidate) } : item))} />
+                                  <Input type="text" inputMode="decimal" aria-label="Artifact percent" value={row.percent} onChange={(event) => setGroups(groups.map((item, index) => index === groupIndex ? { ...item, rows: item.rows.map((candidate, inner) => inner === rowIndex ? { ...candidate, percent: normalizePercentInput(event.target.value, candidate.percent) } : candidate) } : item))} onBlur={() => setGroups(groups.map((item, index) => index === groupIndex ? { ...item, rows: item.rows.map((candidate, inner) => inner === rowIndex ? { ...candidate, percent: finalizePercentInput(candidate.percent) } : candidate) } : item))} />
                                   <DeleteConfirmationDialog trigger={<Button type="button" variant="ghost" size="icon" />} title={`ลบ Artifact อันดับ ${rowIndex + 1}?`} description={`รายการ Artifact ในกลุ่ม ${group.name} และเปอร์เซ็นต์เปรียบเทียบจะถูกลบออกจาก Guide`} onConfirm={() => setGroups(groups.map((item, index) => index === groupIndex ? { ...item, rows: item.rows.filter((_, inner) => inner !== rowIndex) } : item))}><Trash2Icon /><span className="sr-only">ลบ Artifact</span></DeleteConfirmationDialog>
                                 </div>
                                 <Field><FieldLabel htmlFor={`artifact-note-${groupIndex}-${rowIndex}`}>Note (optional)</FieldLabel><Textarea id={`artifact-note-${groupIndex}-${rowIndex}`} value={row.note ?? ""} onChange={(event) => setGroups(groups.map((item, index) => index === groupIndex ? { ...item, rows: item.rows.map((candidate, inner) => inner === rowIndex ? { ...candidate, note: event.target.value } : candidate) } : item))} /></Field>
@@ -552,7 +554,7 @@ function ArtifactEditor({ guide, artifacts, initial, catalogTalents }: EditorBas
             </Field>
           </FieldGroup>
         </CardContent>
-        <CardFooter className="justify-end"><AutosaveStatus state={autosave.state} issues={validation.success ? [] : validation.error.issues.map((issue) => issue.path.length ? `${issue.path.join(".")}: ${issue.message}` : issue.message)} onSave={autosave.saveNow} /></CardFooter>
+        <CardFooter className="justify-end"><AutosaveStatus state={autosave.state} issues={validation.success ? [] : formatGuideValidationIssues("artifact", validation.error.issues)} onSave={autosave.saveNow} /></CardFooter>
       </Card>
     </div>
   );
@@ -594,12 +596,12 @@ function ConstellationEditor({ guide, initial, catalogConstellations }: EditorBa
           <CardContent className="flex flex-col gap-4">
             <Field><FieldLabel htmlFor={`constellation-condition-note-${group.clientId}`}>Condition note (optional)</FieldLabel><Textarea id={`constellation-condition-note-${group.clientId}`} value={group.note} onChange={(event) => setGroups(groups.map((item) => item.clientId === group.clientId ? { ...item, note: event.target.value } : item))} /></Field>
             <div className="grid gap-4 lg:grid-cols-2">
-              {group.rows.map((row, rowIndex) => <Card key={row.level} size="sm"><CardHeader>{row.iconUrl ? <Image src={row.iconUrl} alt="" width={48} height={48} className="rounded-lg bg-muted" /> : null}<CardTitle>C{row.level} · {row.name}</CardTitle><CardDescription>{row.description}</CardDescription></CardHeader><CardContent className="flex items-end gap-3"><Field className="min-w-0 flex-1"><FieldLabel>Cumulative %</FieldLabel><Input type="number" step="0.01" value={row.cumulativePercent} onChange={(event) => setGroups(groups.map((item) => item.clientId === group.clientId ? { ...item, rows: item.rows.map((candidate, index) => index === rowIndex ? { ...candidate, cumulativePercent: event.target.value } : candidate) } : item))} /></Field><Toggle variant="outline" pressed={row.isGreat} onPressedChange={(isGreat) => setGroups(groups.map((item) => item.clientId === group.clientId ? { ...item, rows: item.rows.map((candidate, index) => index === rowIndex ? { ...candidate, isGreat } : candidate) } : item))} aria-label={`Mark Condition ${groupIndex + 1} C${row.level} percentage as great`} className={cn(SELECTED_TOGGLE_CLASS, "data-[state=on]:text-warning")}><SparklesIcon data-icon="inline-start" />Great %</Toggle></CardContent></Card>)}
+              {group.rows.map((row, rowIndex) => <Card key={row.level} size="sm"><CardHeader>{row.iconUrl ? <Image src={row.iconUrl} alt="" width={48} height={48} className="rounded-lg bg-muted" /> : null}<CardTitle>C{row.level} · {row.name}</CardTitle><CardDescription>{row.description}</CardDescription></CardHeader><CardContent className="flex items-end gap-3"><Field className="min-w-0 flex-1"><FieldLabel>Cumulative %</FieldLabel><Input type="text" inputMode="decimal" value={row.cumulativePercent} onChange={(event) => setGroups(groups.map((item) => item.clientId === group.clientId ? { ...item, rows: item.rows.map((candidate, index) => index === rowIndex ? { ...candidate, cumulativePercent: normalizePercentInput(event.target.value, candidate.cumulativePercent) } : candidate) } : item))} onBlur={() => setGroups(groups.map((item) => item.clientId === group.clientId ? { ...item, rows: item.rows.map((candidate, index) => index === rowIndex ? { ...candidate, cumulativePercent: finalizePercentInput(candidate.cumulativePercent) } : candidate) } : item))} /></Field><Toggle variant="outline" pressed={row.isGreat} onPressedChange={(isGreat) => setGroups(groups.map((item) => item.clientId === group.clientId ? { ...item, rows: item.rows.map((candidate, index) => index === rowIndex ? { ...candidate, isGreat } : candidate) } : item))} aria-label={`Mark Condition ${groupIndex + 1} C${row.level} percentage as great`} className={cn(SELECTED_TOGGLE_CLASS, "data-[state=on]:text-warning")}><SparklesIcon data-icon="inline-start" />Great %</Toggle></CardContent></Card>)}
             </div>
           </CardContent>
         </Card>)}
       </CardContent>
-      <CardFooter className="flex-wrap justify-between gap-3"><Button type="button" variant="outline" disabled={groups.length >= 20} onClick={() => setGroups([...groups, { clientId: createClientId("constellation-condition"), note: "", rows: makeRows() }])}><PlusIcon data-icon="inline-start" />เพิ่ม Condition</Button><AutosaveStatus state={autosave.state} issues={validation.success ? [] : validation.error.issues.map((issue) => issue.path.length ? `${issue.path.join(".")}: ${issue.message}` : issue.message)} onSave={autosave.saveNow} /></CardFooter>
+      <CardFooter className="flex-wrap justify-between gap-3"><Button type="button" variant="outline" disabled={groups.length >= 20} onClick={() => setGroups([...groups, { clientId: createClientId("constellation-condition"), note: "", rows: makeRows() }])}><PlusIcon data-icon="inline-start" />เพิ่ม Condition</Button><AutosaveStatus state={autosave.state} issues={validation.success ? [] : formatGuideValidationIssues("constellations", validation.error.issues)} onSave={autosave.saveNow} /></CardFooter>
     </Card>
   );
 }
@@ -728,7 +730,7 @@ function TeamEditor({ guide, characters, weapons, artifacts, initial }: EditorBa
           </SortableContext>
         </DndContext>
       </CardContent>
-      <CardFooter className="flex-wrap justify-between gap-3"><Button variant="outline" disabled={characters.length < 4} onClick={() => setTeams([...teams, { clientId: createClientId("team"), title: "", rotationSeconds: "20", combo: "", members: fallbackMembers }])}><PlusIcon data-icon="inline-start" />เพิ่ม Team</Button><AutosaveStatus state={autosave.state} issues={validation.success ? [] : validation.error.issues.map((issue) => issue.path.length ? `${issue.path.join(".")}: ${issue.message}` : issue.message)} onSave={autosave.saveNow} /></CardFooter>
+      <CardFooter className="flex-wrap justify-between gap-3"><Button variant="outline" disabled={characters.length < 4} onClick={() => setTeams([...teams, { clientId: createClientId("team"), title: "", rotationSeconds: "20", combo: "", members: fallbackMembers }])}><PlusIcon data-icon="inline-start" />เพิ่ม Team</Button><AutosaveStatus state={autosave.state} issues={validation.success ? [] : formatGuideValidationIssues("team", validation.error.issues)} onSave={autosave.saveNow} /></CardFooter>
     </Card>
   );
 }
@@ -809,7 +811,7 @@ function ExtraEditor({ guide, initial }: EditorBase) {
                       </Field>
                       <Field><FieldLabel>หัวข้อ</FieldLabel><Input value={row.heading} onChange={(event) => setSections(sections.map((item, index) => index === sectionIndex ? { ...item, rows: item.rows.map((candidate, inner) => inner === rowIndex ? { ...candidate, heading: event.target.value } : candidate) } : item))} /></Field>
                       <Field><FieldLabel>ข้อความ</FieldLabel><Textarea value={row.body} onChange={(event) => setSections(sections.map((item, index) => index === sectionIndex ? { ...item, rows: item.rows.map((candidate, inner) => inner === rowIndex ? { ...candidate, body: event.target.value } : candidate) } : item))} /></Field>
-                      <Field><FieldLabel>Percent (optional)</FieldLabel><Input type="number" step="0.01" value={row.percent ?? ""} onChange={(event) => setSections(sections.map((item, index) => index === sectionIndex ? { ...item, rows: item.rows.map((candidate, inner) => inner === rowIndex ? { ...candidate, percent: event.target.value || null } : candidate) } : item))} /></Field>
+                      <Field><FieldLabel>Percent (optional)</FieldLabel><Input type="text" inputMode="decimal" value={row.percent ?? ""} onChange={(event) => setSections(sections.map((item, index) => index === sectionIndex ? { ...item, rows: item.rows.map((candidate, inner) => inner === rowIndex ? { ...candidate, percent: normalizePercentInput(event.target.value, candidate.percent ?? "") || null } : candidate) } : item))} onBlur={() => setSections(sections.map((item, index) => index === sectionIndex ? { ...item, rows: item.rows.map((candidate, inner) => inner === rowIndex ? { ...candidate, percent: finalizePercentInput(candidate.percent ?? "") || null } : candidate) } : item))} /></Field>
                     </FieldGroup>
                   </CardContent>
                 </Card>
@@ -819,7 +821,7 @@ function ExtraEditor({ guide, initial }: EditorBase) {
           </Card>
         ))}
       </CardContent>
-      <CardFooter className="flex-wrap justify-between gap-3"><Button variant="outline" onClick={() => setSections([...sections, { title: "Extra", rows: [] }])}><PlusIcon data-icon="inline-start" />เพิ่ม Extra section</Button><AutosaveStatus state={autosave.state} issues={validation.success ? [] : validation.error.issues.map((issue) => issue.path.length ? `${issue.path.join(".")}: ${issue.message}` : issue.message)} onSave={autosave.saveNow} /></CardFooter>
+      <CardFooter className="flex-wrap justify-between gap-3"><Button variant="outline" onClick={() => setSections([...sections, { title: "Extra", rows: [] }])}><PlusIcon data-icon="inline-start" />เพิ่ม Extra section</Button><AutosaveStatus state={autosave.state} issues={validation.success ? [] : formatGuideValidationIssues("extra", validation.error.issues)} onSave={autosave.saveNow} /></CardFooter>
     </Card>
   );
 }
diff --git a/lib/guides/percent-input.test.ts b/lib/guides/percent-input.test.ts
new file mode 100644
index 0000000..4e226b0
--- /dev/null
+++ b/lib/guides/percent-input.test.ts
@@ -0,0 +1,17 @@
+import { describe, expect, it } from "vitest";
+
+import { finalizePercentInput, normalizePercentInput } from "@/lib/guides/percent-input";
+
+describe("percentage input", () => {
+  it("turns only a lone dash into zero when editing finishes", () => {
+    expect(normalizePercentInput("-")).toBe("-");
+    expect(finalizePercentInput("-")).toBe("0");
+    expect(finalizePercentInput("-20")).toBe("-20");
+  });
+
+  it("keeps positive and negative decimal input and ignores other text", () => {
+    expect(normalizePercentInput("12.5")).toBe("12.5");
+    expect(normalizePercentInput("-12.5")).toBe("-12.5");
+    expect(normalizePercentInput("invalid", "12")).toBe("12");
+  });
+});
diff --git a/lib/guides/percent-input.ts b/lib/guides/percent-input.ts
new file mode 100644
index 0000000..65866cf
--- /dev/null
+++ b/lib/guides/percent-input.ts
@@ -0,0 +1,10 @@
+const DECIMAL = /^-?(?:\d+\.?\d*|\.\d*)?$/u;
+
+export function normalizePercentInput(nextValue: string, currentValue = ""): string {
+  const value = nextValue.trim();
+  return DECIMAL.test(value) ? value : currentValue;
+}
+
+export function finalizePercentInput(value: string): string {
+  return value === "-" ? "0" : value;
+}
diff --git a/lib/guides/validation-messages.test.ts b/lib/guides/validation-messages.test.ts
new file mode 100644
index 0000000..ea78135
--- /dev/null
+++ b/lib/guides/validation-messages.test.ts
@@ -0,0 +1,17 @@
+import { describe, expect, it } from "vitest";
+
+import { formatGuideValidationIssues } from "@/lib/guides/validation-messages";
+
+describe("guide validation messages", () => {
+  it("turns a raw weapon path into an actionable message", () => {
+    expect(formatGuideValidationIssues("weapon", [{ path: ["rows", 5, "weaponKey"], message: "Invalid input" }])).toEqual([
+      "อาวุธอันดับ 6: กรุณาเลือกอาวุธ",
+    ]);
+  });
+
+  it("keeps specific Thai schema messages with a useful item label", () => {
+    expect(formatGuideValidationIssues("team", [{ path: ["teams", 1, "members"], message: "Team ต้องมีตัวละครไม่ซ้ำกัน 4 ตัว" }])).toEqual([
+      "Team 2: Team ต้องมีตัวละครไม่ซ้ำกัน 4 ตัว",
+    ]);
+  });
+});
diff --git a/lib/guides/validation-messages.ts b/lib/guides/validation-messages.ts
new file mode 100644
index 0000000..370fd8c
--- /dev/null
+++ b/lib/guides/validation-messages.ts
@@ -0,0 +1,72 @@
+export type GuideValidationSection = "weapon" | "artifact" | "constellations" | "team" | "extra";
+
+interface ValidationIssue {
+  path: readonly PropertyKey[];
+  message: string;
+}
+
+const fieldMessages: Record<string, string> = {
+  weaponKey: "กรุณาเลือกอาวุธ",
+  firstArtifactKey: "กรุณาเลือก Artifact ชุดแรก",
+  characterKey: "กรุณาเลือกตัวละคร",
+  overallPercent: "กรุณากรอก Overall % ระหว่าง -9,999 ถึง 9,999",
+  personalPercent: "กรุณากรอก Personal % ระหว่าง -9,999 ถึง 9,999",
+  percent: "กรุณากรอกเปอร์เซ็นต์ระหว่าง -9,999 ถึง 9,999",
+  cumulativePercent: "กรุณากรอก Cumulative % ระหว่าง -9,999 ถึง 9,999",
+  title: "กรุณากรอกชื่อไม่เกิน 160 ตัวอักษร",
+  heading: "กรุณากรอกหัวข้อไม่เกิน 200 ตัวอักษร",
+  combo: "กรุณากรอก Combo",
+  rotationSeconds: "กรุณากรอก Rotation เป็นตัวเลขมากกว่า 0",
+  damage: "กรุณากรอก Damage เป็นตัวเลข 0 ขึ้นไป",
+};
+
+const sectionLabels: Record<GuideValidationSection, string> = {
+  weapon: "Weapon tier list",
+  artifact: "Artifact",
+  constellations: "Constellations",
+  team: "Team Calc",
+  extra: "Extra sections",
+};
+
+function indexAfter(path: readonly PropertyKey[], key: string): number | null {
+  const position = path.indexOf(key);
+  const value = path[position + 1];
+  return position >= 0 && typeof value === "number" ? value : null;
+}
+
+function issueContext(section: GuideValidationSection, path: readonly PropertyKey[]): string {
+  const rowIndex = indexAfter(path, "rows");
+  const groupIndex = indexAfter(path, "groups");
+  const teamIndex = indexAfter(path, "teams");
+  const memberIndex = indexAfter(path, "members");
+  const sectionIndex = indexAfter(path, "sections");
+
+  if (section === "weapon" && rowIndex !== null) return `อาวุธอันดับ ${rowIndex + 1}`;
+  if (section === "artifact" && groupIndex !== null) {
+    const group = groupIndex === 0 ? "Late Game" : "Early Game";
+    return rowIndex === null ? `Artifact ${group}` : `Artifact ${group} อันดับ ${rowIndex + 1}`;
+  }
+  if (section === "constellations" && groupIndex !== null) {
+    return rowIndex === null ? `Condition ${groupIndex + 1}` : `Condition ${groupIndex + 1} · C${rowIndex + 1}`;
+  }
+  if (section === "team" && teamIndex !== null) {
+    return memberIndex === null ? `Team ${teamIndex + 1}` : `Team ${teamIndex + 1} · ตัวละคร ${memberIndex + 1}`;
+  }
+  if (section === "extra" && sectionIndex !== null) {
+    return rowIndex === null ? `Extra section ${sectionIndex + 1}` : `Extra section ${sectionIndex + 1} · แถว ${rowIndex + 1}`;
+  }
+  return sectionLabels[section];
+}
+
+function issueMessage(issue: ValidationIssue): string {
+  const field = issue.path.at(-1);
+  if (typeof field === "string" && fieldMessages[field]) return fieldMessages[field];
+  if (/[฀-๿]/u.test(issue.message)) return issue.message;
+  if (issue.message.startsWith("Too small")) return "กรุณากรอกข้อมูลให้ครบ";
+  if (issue.message.startsWith("Too big")) return "ข้อมูลเกินจำนวนหรือความยาวที่กำหนด";
+  return "กรุณาตรวจสอบข้อมูลให้ถูกต้อง";
+}
+
+export function formatGuideValidationIssues(section: GuideValidationSection, issues: readonly ValidationIssue[]): string[] {
+  return issues.map((issue) => `${issueContext(section, issue.path)}: ${issueMessage(issue)}`);
+}