changes

src/CiselnaVyprava/Components/BattleArena.razor

@@ -107,6 +107,58 @@
         }
     </div>
 
+    <!-- PAUSE & STEP-BY-STEP EXPLANATION MODAL (WHEN ANSWER IS INCORRECT) -->
+    @if (ShowExplanationModal && ExplanationProblem != null)
+    {
+        <div class="explanation-modal-overlay anim-fade-in">
+            <div class="explanation-parchment-box anim-victory-modal-pop">
+                <div class="explanation-header">
+                    <span class="explanation-owl-icon">🦉</span>
+                    <span class="explanation-badge">📖 MÚDRA ROZPRÁVKOVÁ RADA</span>
+                    <h2 class="explanation-title">Pozor na chybičku!</h2>
+                </div>
+
+                <div class="explanation-body">
+                    <!-- QUESTION & ANSWERS COMPARISON ROW -->
+                    <div class="explanation-equation-card">
+                        <div class="equation-question-row">
+                            <span class="equation-label">Príklad:</span>
+                            <span class="equation-text">@ExplanationProblem.QuestionText</span>
+                        </div>
+
+                        <div class="equation-answers-row">
+                            <div class="answer-box user-answer">
+                                <span class="ans-label">Tvoja odpoveď:</span>
+                                <span class="ans-val">@(string.IsNullOrWhiteSpace(ExplanationUserAnswer) ? "Čas vypršal ⏱️" : ExplanationUserAnswer) ❌</span>
+                            </div>
+                            <div class="answer-box correct-answer">
+                                <span class="ans-label">Správny výsledok:</span>
+                                <span class="ans-val">@ExplanationProblem.CorrectAnswer ✅</span>
+                            </div>
+                        </div>
+                    </div>
+
+                    <!-- STEP BY STEP EXPLANATION -->
+                    <div class="explanation-step-card">
+                        <div class="step-card-header">
+                            <span class="sparkle-icon">💡</span>
+                            <strong>Ako na to (Postup výpočtu):</strong>
+                        </div>
+                        <p class="step-explanation-text">
+                            @ExplanationProblem.Explanation
+                        </p>
+                    </div>
+                </div>
+
+                <div class="explanation-actions">
+                    <button class="btn-grand-celebration btn-explanation-continue" @onclick="DismissExplanation">
+                        @(IsExplanationFromDefense ? "🛡️ ROZUMIEM, POKRAČOVAŤ ➜" : "⚔️ ROZUMIEM, IDEME NA OBRANU! ➜")
+                    </button>
+                </div>
+            </div>
+        </div>
+    }
+
     <!-- FULLSCREEN VICTORY / DEFEAT CELEBRATION OVERLAY -->
     @if (State.IsBattleOver)
     {
@@ -213,6 +265,11 @@
     private System.Threading.Timer? _timer;
     private double RemainingTimeSeconds { get; set; } = 6.0;
 
+    private bool ShowExplanationModal { get; set; } = false;
+    private bool IsExplanationFromDefense { get; set; } = false;
+    private string ExplanationUserAnswer { get; set; } = string.Empty;
+    private MathProblem? ExplanationProblem { get; set; }
+
     private Level? NextLevel => DataLoader.GetNextLevel(PlayerGrade, CurrentLevel.Id);
     private string? _loadedLevelId;
 
@@ -241,6 +298,8 @@
 
     private void StartBattle()
     {
+        ShowExplanationModal = false;
+        ExplanationProblem = null;
         BattleEngine.StartBattle(Hero, CurrentLevel, Config);
         CurrentInput = string.Empty;
         StartTimer();
@@ -249,58 +308,162 @@
     private void StartTimer()
     {
         _timer?.Dispose();
+        State.ProblemStartTime = DateTime.UtcNow;
         RemainingTimeSeconds = State.IsDefensePhase ? Config.Battle.DefenseTestDurationSeconds : Config.Battle.StandardTimeSeconds;
         _timer = new System.Threading.Timer(async _ =>
         {
+            if (ShowExplanationModal || State.IsBattleOver) return;
+
             var elapsed = (DateTime.UtcNow - State.ProblemStartTime).TotalSeconds;
             double limit = State.IsDefensePhase ? Config.Battle.DefenseTestDurationSeconds : Config.Battle.StandardTimeSeconds;
             RemainingTimeSeconds = Math.Max(0, limit - elapsed);
 
+            if (RemainingTimeSeconds <= 0)
+            {
+                _timer?.Dispose();
+                await InvokeAsync(async () =>
+                {
+                    if (State.IsDefensePhase)
+                    {
+                        var prob = State.CurrentProblem;
+                        var result = await BattleEngine.SubmitDefenseAnswerAsync("");
+                        ExplanationProblem = prob;
+                        ExplanationUserAnswer = "Čas vypršal ⏱️";
+                        IsExplanationFromDefense = true;
+                        ShowExplanationModal = true;
+                        StateHasChanged();
+                    }
+                    else
+                    {
+                        var prob = State.CurrentProblem;
+                        var result = await BattleEngine.SubmitAnswerAsync("");
+                        ExplanationProblem = prob;
+                        ExplanationUserAnswer = "Čas vypršal ⏱️";
+                        IsExplanationFromDefense = false;
+                        ShowExplanationModal = true;
+                        StateHasChanged();
+                    }
+                });
+                return;
+            }
+
             await InvokeAsync(StateHasChanged);
         }, null, 100, 100);
     }
 
     private async Task HandleInputSubmit(string input)
     {
-        if (State.IsBattleOver) return;
+        if (State.IsBattleOver || ShowExplanationModal) return;
 
         if (State.IsDefensePhase)
         {
-            await BattleEngine.SubmitDefenseAnswerAsync(input);
+            var problemBeforeSubmit = State.CurrentProblem;
+            var result = await BattleEngine.SubmitDefenseAnswerAsync(input);
+            CurrentInput = string.Empty;
+
+            if (result is CombatResultType.DefenseFailed or CombatResultType.Defeat)
+            {
+                _timer?.Dispose();
+                ExplanationProblem = problemBeforeSubmit;
+                ExplanationUserAnswer = input;
+                IsExplanationFromDefense = true;
+                ShowExplanationModal = true;
+                StateHasChanged();
+                return;
+            }
         }
         else
         {
-            await BattleEngine.SubmitAnswerAsync(input);
+            var problemBeforeSubmit = State.CurrentProblem;
+            var result = await BattleEngine.SubmitAnswerAsync(input);
+            CurrentInput = string.Empty;
+
+            if (result == CombatResultType.PlayerMissed)
+            {
+                _timer?.Dispose();
+                ExplanationProblem = problemBeforeSubmit;
+                ExplanationUserAnswer = input;
+                IsExplanationFromDefense = false;
+                ShowExplanationModal = true;
+                StateHasChanged();
+                return;
+            }
         }
 
-        CurrentInput = string.Empty;
         await ProcessPostTurn();
     }
 
     private async Task HandleChoiceSelected(string choice)
     {
-        if (State.IsBattleOver) return;
+        if (State.IsBattleOver || ShowExplanationModal) return;
 
         if (State.IsDefensePhase)
         {
-            await BattleEngine.SubmitDefenseAnswerAsync(choice);
+            var problemBeforeSubmit = State.CurrentProblem;
+            var result = await BattleEngine.SubmitDefenseAnswerAsync(choice);
+
+            if (result is CombatResultType.DefenseFailed or CombatResultType.Defeat)
+            {
+                _timer?.Dispose();
+                ExplanationProblem = problemBeforeSubmit;
+                ExplanationUserAnswer = choice;
+                IsExplanationFromDefense = true;
+                ShowExplanationModal = true;
+                StateHasChanged();
+                return;
+            }
         }
         else
         {
-            await BattleEngine.SubmitAnswerAsync(choice);
+            var problemBeforeSubmit = State.CurrentProblem;
+            var result = await BattleEngine.SubmitAnswerAsync(choice);
+
+            if (result == CombatResultType.PlayerMissed)
+            {
+                _timer?.Dispose();
+                ExplanationProblem = problemBeforeSubmit;
+                ExplanationUserAnswer = choice;
+                IsExplanationFromDefense = false;
+                ShowExplanationModal = true;
+                StateHasChanged();
+                return;
+            }
         }
 
         await ProcessPostTurn();
     }
 
+    private async Task DismissExplanation()
+    {
+        ShowExplanationModal = false;
+
+        if (IsExplanationFromDefense)
+        {
+            if (State.IsBattleOver)
+            {
+                StateHasChanged();
+                return;
+            }
+
+            BattleEngine.NextProblem();
+            StartTimer();
+            StateHasChanged();
+        }
+        else
+        {
+            // Start fresh timer for the defense phase problem
+            StartTimer();
+            StateHasChanged();
+        }
+    }
+
     private async Task ProcessPostTurn()
     {
         StateHasChanged();
 
         if (!State.IsBattleOver)
         {
-            // Short delay to display attack/hurt animation before next question
-            await Task.Delay(1000);
+            await Task.Delay(900);
             if (!State.IsDefensePhase)
             {
                 BattleEngine.NextProblem();
@@ -370,8 +533,10 @@
 
     private string GetTimerColorClass()
     {
-        if (RemainingTimeSeconds > 3.0) return "timer-green";
-        if (RemainingTimeSeconds > 1.5) return "timer-yellow";
+        double limit = State.IsDefensePhase ? Config.Battle.DefenseTestDurationSeconds : Config.Battle.StandardTimeSeconds;
+        double ratio = limit > 0 ? (RemainingTimeSeconds / limit) : 0;
+        if (ratio > 0.45) return "timer-green";
+        if (ratio > 0.20) return "timer-yellow";
         return "timer-red";
     }
 
@@ -400,6 +565,15 @@
 
     private async Task HandleKeyDown(KeyboardEventArgs e)
     {
+        if (ShowExplanationModal)
+        {
+            if (e.Key is "Enter" or " " or "Escape")
+            {
+                await DismissExplanation();
+            }
+            return;
+        }
+
         if (State.IsBattleOver)
         {
             if (e.Key == "Enter")

src/CiselnaVyprava/Models/GameConfig.cs

@@ -8,11 +8,11 @@ public class GameConfig
 
 public class BattleConfig
 {
-    public double CriticalTimeSeconds { get; set; } = 3.0;
-    public double StandardTimeSeconds { get; set; } = 6.0;
+    public double CriticalTimeSeconds { get; set; } = 4.0;
+    public double StandardTimeSeconds { get; set; } = 10.0;
     public double CriticalDamageMultiplier { get; set; } = 1.5;
     public double WeakDamageMultiplier { get; set; } = 0.5;
-    public double DefenseTestDurationSeconds { get; set; } = 5.0;
+    public double DefenseTestDurationSeconds { get; set; } = 16.0;
     public int DefaultPlayerHp { get; set; } = 5;
     public int ComboStreakBonusDmg { get; set; } = 1;
 }

src/CiselnaVyprava/Models/GameModels.cs

@@ -43,6 +43,7 @@ public class MathProblem
     public string Operation { get; set; } = "+";
     public string DisplayB { get; set; } = string.Empty;
     public string CorrectAnswer { get; set; } = string.Empty;
+    public string Explanation { get; set; } = string.Empty;
     public List<string> Choices { get; set; } = new();
     public string InputType { get; set; } = "DirectInput";
     public bool IsDefenseTest { get; set; } = false;

src/CiselnaVyprava/Pages/Home.razor

@@ -51,24 +51,60 @@
     }
 
     <!-- FAIRYTALE LEVEL TRANSITION SCREEN -->
-    @if (IsTransitioning)
+    @if (IsTransitioning && PendingLevel != null)
     {
         var hero = DataLoader.GetHero(Profile.SelectedHeroId) ?? DataLoader.Heroes.FirstOrDefault();
         var heroAvatar = hero != null ? $"{hero.AssetFolder}_idle_p1.png" : "assets/images/heroes/knight_idle_p1.png";
+        var enemyAvatar = $"{PendingLevel.Enemy.AssetFolder}_idle_p1.png";
+        var heroDisplayName = !string.IsNullOrWhiteSpace(Profile.Name) ? Profile.Name : (hero?.Name ?? "Hrdina");
 
         <div class="transition-screen-overlay anim-fade-in">
             <div class="transition-parchment-box anim-victory-modal-pop">
-                <div class="transition-hero-marching">
-                    <img src="@heroAvatar" 
-                         class="marching-hero-img anim-hero-march" 
-                         alt="Hrdina na ceste" />
+                <div class="transition-header">
+                    <span class="transition-badge">@(PendingLevel.IsBoss ? "👑 BOSS LEVEL" : "⚔️ NOVÁ VÝZVA")</span>
+                    <h2 class="transition-title">@PendingLevel.Name</h2>
                 </div>
-                <h2 class="transition-title">🗺️ Vstupuješ do novej oblasti...</h2>
-                <p class="transition-target">📍 @TransitionTargetText</p>
-                <div class="transition-sparkles">
-                    <span class="sparkle">✨</span>
-                    <span class="sparkle">⭐</span>
-                    <span class="sparkle">✨</span>
+
+                <div class="transition-faceoff-stage">
+                    <div class="faceoff-card hero-side">
+                        <div class="faceoff-avatar-pedestal">
+                            <img src="@heroAvatar" 
+                                 class="faceoff-avatar-img anim-hero-march" 
+                                 alt="@heroDisplayName" />
+                        </div>
+                        <span class="faceoff-name">@heroDisplayName</span>
+                        <span class="faceoff-role">Udatný Počtár</span>
+                    </div>
+
+                    <div class="faceoff-vs-pill">
+                        <span class="vs-text">VS</span>
+                        <span class="vs-swords">⚔️</span>
+                    </div>
+
+                    <div class="faceoff-card enemy-side">
+                        <div class="faceoff-avatar-pedestal">
+                            <img src="@enemyAvatar" 
+                                 class="faceoff-avatar-img anim-enemy-idle" 
+                                 alt="@PendingLevel.Enemy.Name" />
+                        </div>
+                        <span class="faceoff-name">@PendingLevel.Enemy.Name</span>
+                        <span class="faceoff-hp-badge">❤️ @PendingLevel.Enemy.MaxHp HP</span>
+                    </div>
+                </div>
+
+                <div class="transition-details-card">
+                    <p class="transition-math-info">
+                        🧠 <strong>Úloha:</strong> @(PendingLevel.IsBoss ? "Záverečná skúška vedomostí!" : "Vyrieš matematické príklady a poraz protivníka!")
+                    </p>
+                </div>
+
+                <div class="transition-action-buttons">
+                    <button class="btn-grand-celebration btn-transition-start" @onclick="ConfirmAndStartPendingLevel">
+                        ⚔️ VSTÚPIŤ DO BOJA ➜
+                    </button>
+                    <button class="btn-secondary-celebration" @onclick="CancelPendingLevel">
+                        🗺️ Späť na mapu
+                    </button>
                 </div>
             </div>
         </div>
@@ -89,9 +125,9 @@
     private ScreenType CurrentScreen { get; set; } = ScreenType.Loading;
     private PlayerProfile Profile { get; set; } = new();
     private Level? SelectedLevel { get; set; }
+    private Level? PendingLevel { get; set; }
 
     private bool IsTransitioning { get; set; } = false;
-    private string TransitionTargetText { get; set; } = string.Empty;
 
     protected override async Task OnInitializedAsync()
     {
@@ -121,17 +157,30 @@
         await Storage.SaveProfileAsync(Profile);
     }
 
-    private async Task HandleLevelSelected(Level level)
+    private void HandleLevelSelected(Level level)
     {
-        TransitionTargetText = $"{level.Name} (Protivník: {level.Enemy.Name})";
+        PendingLevel = level;
         IsTransitioning = true;
         StateHasChanged();
+    }
 
-        await Task.Delay(850);
+    private void ConfirmAndStartPendingLevel()
+    {
+        if (PendingLevel != null)
+        {
+            SelectedLevel = PendingLevel;
+            PendingLevel = null;
+            CurrentScreen = ScreenType.Battle;
+            IsTransitioning = false;
+            StateHasChanged();
+        }
+    }
 
-        SelectedLevel = level;
-        CurrentScreen = ScreenType.Battle;
+    private void CancelPendingLevel()
+    {
+        PendingLevel = null;
         IsTransitioning = false;
+        CurrentScreen = ScreenType.WorldMap;
         StateHasChanged();
     }
 
@@ -150,7 +199,7 @@
             await Storage.SaveProfileAsync(Profile);
         }
 
-        await HandleLevelSelected(nextLevel);
+        HandleLevelSelected(nextLevel);
     }
 
     private void UnlockNextLevel(Level completedLevel)

src/CiselnaVyprava/Services/MathProblemGenerator.cs

@@ -107,6 +107,7 @@ public class MathProblemGenerator : IMathProblemGenerator
             DisplayB = b.ToString(),
             CorrectAnswer = sum.ToString(),
             QuestionText = $"{a} + {b} = ?",
+            Explanation = GetAdditionExplanation(a, b, sum),
             InputType = config.InputType
         };
 
@@ -118,6 +119,36 @@ public class MathProblemGenerator : IMathProblemGenerator
         return problem;
     }
 
+    private string GetAdditionExplanation(int a, int b, int sum)
+    {
+        if (sum <= 10)
+        {
+            return $"Sčítanie: k číslu {a} pridáme {b} a dostaneme {sum}.";
+        }
+        if (a < 10 && b < 10 && sum > 10)
+        {
+            int toTen = 10 - a;
+            int rem = b - toTen;
+            return $"Tip: Rozlož si druhé číslo {b} na {toTen} a {rem}. Najprv doplň do desiatky ({a} + {toTen} = 10) a potom pripočítaj zvyšok (10 + {rem} = {sum})!";
+        }
+        if (a >= 10 && b < 10)
+        {
+            int unitsA = a % 10;
+            if (unitsA + b < 10)
+            {
+                return $"Sčítaj jednotky: {unitsA} + {b} = {unitsA + b}. Desiatky ({a / 10 * 10}) opíšeme: výsledok je {sum}.";
+            }
+            else
+            {
+                int toNextTen = 10 - unitsA;
+                int rem = b - toNextTen;
+                int nextTen = ((a / 10) + 1) * 10;
+                return $"Doplň do celej desiatky: {a} + {toNextTen} = {nextTen}, a potom pripočítaj zvyšných {rem}: {nextTen} + {rem} = {sum}!";
+            }
+        }
+        return $"Sčítanie: {a} + {b} = {sum}.";
+    }
+
     private MathProblem GenerateSubtraction(MathConfig config, int hpPhase)
     {
         // Phase 4: Possibility of 3-term mixed chain
@@ -135,6 +166,7 @@ public class MathProblemGenerator : IMathProblemGenerator
                 DisplayB = "",
                 CorrectAnswer = res3.ToString(),
                 QuestionText = $"{a3} - {b3} + {c3} = ?",
+                Explanation = $"Počítaj postupne zľava doprava: najprv {a3} - {b3} = {a3 - b3}, a potom {a3 - b3} + {c3} = {res3}.",
                 InputType = config.InputType
             };
             if (config.InputType == "MultipleChoice")
@@ -184,6 +216,7 @@ public class MathProblemGenerator : IMathProblemGenerator
             DisplayB = b.ToString(),
             CorrectAnswer = diff.ToString(),
             QuestionText = $"{a} - {b} = ?",
+            Explanation = GetSubtractionExplanation(a, b, diff),
             InputType = config.InputType
         };
 
@@ -195,6 +228,42 @@ public class MathProblemGenerator : IMathProblemGenerator
         return problem;
     }
 
+    private string GetSubtractionExplanation(int a, int b, int diff)
+    {
+        if (a <= 10)
+        {
+            return $"Odčítanie: od čísla {a} uberieme {b} a zostane nám {diff}.";
+        }
+        if (a > 10 && a <= 20 && b < 10)
+        {
+            int toTen = a - 10;
+            if (b <= toTen)
+            {
+                return $"Odčítaj jednotky: {toTen} - {b} = {toTen - b}. K desiatke pridáme {toTen - b} a máme {diff}.";
+            }
+            else
+            {
+                int rem = b - toTen;
+                return $"Tip: Rozlož si {b} na {toTen} a {rem}. Najprv odčítaj po desiatku ({a} - {toTen} = 10) a potom uber zvyšok (10 - {rem} = {diff})!";
+            }
+        }
+        if (a > 20 && b < 10)
+        {
+            int unitsA = a % 10;
+            if (unitsA >= b)
+            {
+                return $"Odčítaj jednotky: {unitsA} - {b} = {unitsA - b}. Desiatky ({a / 10 * 10}) zostávajú: výsledok je {diff}.";
+            }
+            else
+            {
+                int rem = b - unitsA;
+                int prevTen = (a / 10) * 10;
+                return $"Odčítaj najprv {unitsA} do desiatky ({a} - {unitsA} = {prevTen}) a potom odčítaj zvyšných {rem} ({prevTen} - {rem} = {diff})!";
+            }
+        }
+        return $"Odčítanie: {a} - {b} = {diff}.";
+    }
+
     private MathProblem GenerateMultiplication(MathConfig config, int hpPhase)
     {
         var factors = config.Factors != null && config.Factors.Count > 0 
@@ -232,6 +301,7 @@ public class MathProblemGenerator : IMathProblemGenerator
             DisplayB = factorB.ToString(),
             CorrectAnswer = product.ToString(),
             QuestionText = $"{factorA} × {factorB} = ?",
+            Explanation = $"Násobenie: {factorA} × {factorB} znamená {factorB}-krát sčítať číslo {factorA}. Výsledok je {product}.",
             InputType = config.InputType
         };
 
@@ -280,6 +350,7 @@ public class MathProblemGenerator : IMathProblemGenerator
             DisplayB = divisor.ToString(),
             CorrectAnswer = result.ToString(),
             QuestionText = $"{dividend} ÷ {divisor} = ?",
+            Explanation = $"Delenie: pýtame sa, koľkokrát sa {divisor} zmestí do {dividend}. Keďže {divisor} × {result} = {dividend}, výsledok je {result}!",
             InputType = config.InputType
         };
 
@@ -321,6 +392,7 @@ public class MathProblemGenerator : IMathProblemGenerator
             }
 
             string comp = leftVal < rightVal ? "<" : (leftVal > rightVal ? ">" : "=");
+            string compWord = leftVal < rightVal ? "menšie ako" : (leftVal > rightVal ? "väčšie ako" : "rovné");
 
             return new MathProblem
             {
@@ -329,6 +401,7 @@ public class MathProblemGenerator : IMathProblemGenerator
                 DisplayB = rightStr,
                 CorrectAnswer = comp,
                 QuestionText = $"{leftStr}   ?   {rightStr}",
+                Explanation = $"Vypočítajme obe strany: ( {leftStr} = {leftVal} ) a ( {rightStr} = {rightVal} ). Keďže {leftVal} je {compWord} {rightVal}, správny znak je {comp}.",
                 InputType = "MultipleChoice",
                 Choices = new List<string> { "<", "=", ">" }
             };
@@ -343,6 +416,7 @@ public class MathProblemGenerator : IMathProblemGenerator
         }
 
         string answer = x < y ? "<" : (x > y ? ">" : "=");
+        string word = x < y ? "menšie ako" : (x > y ? "väčšie ako" : "rovné");
 
         return new MathProblem
         {
@@ -351,6 +425,7 @@ public class MathProblemGenerator : IMathProblemGenerator
             DisplayB = y.ToString(),
             CorrectAnswer = answer,
             QuestionText = $"{x}   ?   {y}",
+            Explanation = $"Porovnanie: Číslo {x} je {word} číslu {y}, preto platí {x} {answer} {y}.",
             InputType = "MultipleChoice",
             Choices = new List<string> { "<", "=", ">" }
         };
@@ -392,11 +467,10 @@ public class MathProblemGenerator : IMathProblemGenerator
 
     private MathProblem GenerateChallengingComparisonDefense(MathConfig config)
     {
-        // Compare expressions: (a + b) ? (c - d)
         int valLeft, valRight;
         string exprLeft, exprRight;
 
-        if (config.MaxA > 100) // Grade 3 large numbers
+        if (config.MaxA > 100)
         {
             int a = _rand.Next(10, 50) * 10;
             int b = _rand.Next(5, 30) * 10;
@@ -408,7 +482,7 @@ public class MathProblemGenerator : IMathProblemGenerator
             valRight = c - d;
             exprRight = $"{c} - {d}";
         }
-        else if (config.MaxSum > 20 || config.MaxA > 20) // Grade 2
+        else if (config.MaxSum > 20 || config.MaxA > 20)
         {
             int a = _rand.Next(10, 45);
             int b = _rand.Next(5, 30);
@@ -420,7 +494,7 @@ public class MathProblemGenerator : IMathProblemGenerator
             valRight = c - d;
             exprRight = $"{c} - {d}";
         }
-        else // Grade 1
+        else
         {
             int a = _rand.Next(2, 9);
             int b = _rand.Next(2, 9);
@@ -433,7 +507,6 @@ public class MathProblemGenerator : IMathProblemGenerator
             exprRight = $"{c} - {d}";
         }
 
-        // Sometimes create equal expressions
         if (_rand.Next(3) == 0)
         {
             valRight = valLeft;
@@ -442,6 +515,7 @@ public class MathProblemGenerator : IMathProblemGenerator
         }
 
         string answer = valLeft < valRight ? "<" : (valLeft > valRight ? ">" : "=");
+        string compWord = valLeft < valRight ? "menšie ako" : (valLeft > valRight ? "väčšie ako" : "rovné");
 
         return new MathProblem
         {
@@ -450,6 +524,7 @@ public class MathProblemGenerator : IMathProblemGenerator
             DisplayB = exprRight,
             CorrectAnswer = answer,
             QuestionText = $"Porovnaj výrazy:\n( {exprLeft} )   ?   ( {exprRight} )",
+            Explanation = $"Ľavá strana: {exprLeft} = {valLeft}. Pravá strana: {exprRight} = {valRight}. Keďže {valLeft} je {compWord} {valRight}, správny znak je {answer}.",
             InputType = "MultipleChoice",
             Choices = new List<string> { "<", "=", ">" },
             IsDefenseTest = true
@@ -461,8 +536,9 @@ public class MathProblemGenerator : IMathProblemGenerator
         bool isAdd = _rand.Next(2) == 0;
         int missing, known, result;
         string equation;
+        string explanation;
 
-        if (config.MaxSum > 100 || config.MaxA > 100) // Grade 3
+        if (config.MaxSum > 100 || config.MaxA > 100)
         {
             known = _rand.Next(10, 50) * 10;
             missing = _rand.Next(10, 40) * 10;
@@ -470,15 +546,17 @@ public class MathProblemGenerator : IMathProblemGenerator
             {
                 result = known + missing;
                 equation = _rand.Next(2) == 0 ? $"{known} + ❓ = {result}" : $"❓ + {known} = {result}";
+                explanation = $"Neznáme číslo nájdeme odčítaním: {result} - {known} = {missing}.";
             }
             else
             {
                 result = known;
                 int total = known + missing;
                 equation = $"{total} - ❓ = {result}";
+                explanation = $"Neznáme číslo zistíme odčítaním výsledku od celku: {total} - {result} = {missing}.";
             }
         }
-        else if (config.MaxSum > 20 || config.MaxA > 20) // Grade 2
+        else if (config.MaxSum > 20 || config.MaxA > 20)
         {
             known = _rand.Next(12, 50);
             missing = _rand.Next(8, 35);
@@ -486,15 +564,17 @@ public class MathProblemGenerator : IMathProblemGenerator
             {
                 result = known + missing;
                 equation = _rand.Next(2) == 0 ? $"{known} + ❓ = {result}" : $"❓ + {known} = {result}";
+                explanation = $"Neznáme číslo nájdeme odčítaním: {result} - {known} = {missing}.";
             }
             else
             {
                 result = known;
                 int total = known + missing;
                 equation = $"{total} - ❓ = {result}";
+                explanation = $"Neznáme číslo zistíme odčítaním výsledku od celku: {total} - {result} = {missing}.";
             }
         }
-        else // Grade 1
+        else
         {
             known = _rand.Next(3, 10);
             missing = _rand.Next(3, 10);
@@ -502,12 +582,14 @@ public class MathProblemGenerator : IMathProblemGenerator
             {
                 result = known + missing;
                 equation = _rand.Next(2) == 0 ? $"{known} + ❓ = {result}" : $"❓ + {known} = {result}";
+                explanation = $"Neznáme číslo nájdeme odčítaním: {result} - {known} = {missing}.";
             }
             else
             {
                 result = known;
                 int total = known + missing;
                 equation = $"{total} - ❓ = {result}";
+                explanation = $"Neznáme číslo zistíme odčítaním: {total} - {result} = {missing}.";
             }
         }
 
@@ -518,6 +600,7 @@ public class MathProblemGenerator : IMathProblemGenerator
             DisplayB = "",
             CorrectAnswer = missing.ToString(),
             QuestionText = $"Doplň chýbajúce číslo ❓:\n{equation}",
+            Explanation = explanation,
             InputType = "MultipleChoice",
             Choices = GenerateNumericChoices(missing, 1, 1000),
             IsDefenseTest = true
@@ -529,7 +612,7 @@ public class MathProblemGenerator : IMathProblemGenerator
         int a, b, c, result;
         string expr;
 
-        if (config.MaxSum > 100 || config.MaxA > 100) // Grade 3
+        if (config.MaxSum > 100 || config.MaxA > 100)
         {
             a = _rand.Next(15, 45) * 10;
             b = _rand.Next(10, 30) * 10;
@@ -537,7 +620,7 @@ public class MathProblemGenerator : IMathProblemGenerator
             result = a + b - c;
             expr = $"{a} + {b} - {c}";
         }
-        else if (config.MaxSum > 20 || config.MaxA > 20) // Grade 2
+        else if (config.MaxSum > 20 || config.MaxA > 20)
         {
             a = _rand.Next(15, 50);
             b = _rand.Next(10, 30);
@@ -545,7 +628,7 @@ public class MathProblemGenerator : IMathProblemGenerator
             result = a + b - c;
             expr = $"{a} + {b} - {c}";
         }
-        else // Grade 1
+        else
         {
             a = _rand.Next(4, 9);
             b = _rand.Next(3, 8);
@@ -561,6 +644,7 @@ public class MathProblemGenerator : IMathProblemGenerator
             DisplayB = "",
             CorrectAnswer = result.ToString(),
             QuestionText = $"Vypočítaj trojčlenný reťazec:\n{expr} = ?",
+            Explanation = $"Počítaj po krokoch zľava doprava: najprv {a} + {b} = {a + b}, a potom {a + b} - {c} = {result}.",
             InputType = "MultipleChoice",
             Choices = GenerateNumericChoices(result, 0, 1000),
             IsDefenseTest = true
@@ -585,6 +669,9 @@ public class MathProblemGenerator : IMathProblemGenerator
         string equation = isDiv 
             ? $"{product} ÷ ❓ = {factorA}"
             : (_rand.Next(2) == 0 ? $"{factorA} × ❓ = {product}" : $"❓ × {factorA} = {product}");
+        string explanation = isDiv
+            ? $"Neznámeho deliteľa nájdeme delením: {product} ÷ {factorA} = {missing}."
+            : $"Neznámeho činiteľa nájdeme delením: {product} ÷ {factorA} = {missing}.";
 
         return new MathProblem
         {
@@ -593,6 +680,7 @@ public class MathProblemGenerator : IMathProblemGenerator
             DisplayB = "",
             CorrectAnswer = missing.ToString(),
             QuestionText = $"Nájdi neznáme číslo ❓:\n{equation}",
+            Explanation = explanation,
             InputType = "MultipleChoice",
             Choices = GenerateNumericChoices(missing, 1, 10),
             IsDefenseTest = true
@@ -617,6 +705,7 @@ public class MathProblemGenerator : IMathProblemGenerator
             DisplayB = "",
             CorrectAnswer = result.ToString(),
             QuestionText = $"Kombinovaný výpočet (najprv násob!):\n{expr} = ?",
+            Explanation = $"Násobenie má vždy prednosť! Najprv: {f1} × {f2} = {prod}, a potom: {prod} {(isSub ? "-" : "+")} {add} = {result}.",
             InputType = "MultipleChoice",
             Choices = GenerateNumericChoices(result, 1, 100),
             IsDefenseTest = true
@@ -627,6 +716,7 @@ public class MathProblemGenerator : IMathProblemGenerator
     {
         bool isCorrect = _rand.Next(2) == 0;
         string equation;
+        string explanation;
 
         if (isMult)
         {
@@ -636,6 +726,9 @@ public class MathProblemGenerator : IMathProblemGenerator
             int displayed = isCorrect ? prod : (prod + (_rand.Next(2) == 0 ? _rand.Next(1, 4) : -_rand.Next(1, 4)));
             if (displayed <= 0) displayed = prod + 2;
             equation = $"{a} × {b} = {displayed}";
+            explanation = isCorrect 
+                ? $"Rovnica {equation} je správna, pretože {a} × {b} sa skutočne rovná {prod}." 
+                : $"Rovnica {equation} je nesprávna! Správny výsledok {a} × {b} je {prod} (nie {displayed}).";
         }
         else
         {
@@ -646,6 +739,9 @@ public class MathProblemGenerator : IMathProblemGenerator
             int displayed = isCorrect ? sum : (sum + offset);
             if (displayed <= 0) displayed = sum + 2;
             equation = $"{a} + {b} = {displayed}";
+            explanation = isCorrect 
+                ? $"Rovnica {equation} je správna, pretože {a} + {b} sa skutočne rovná {sum}." 
+                : $"Rovnica {equation} je nesprávna! Správny výsledok {a} + {b} je {sum} (nie {displayed}).";
         }
 
         return new MathProblem
@@ -655,6 +751,7 @@ public class MathProblemGenerator : IMathProblemGenerator
             DisplayB = "",
             CorrectAnswer = isCorrect ? "ÁNO" : "NIE",
             QuestionText = $"Je táto rovnica správna?\n{equation}",
+            Explanation = explanation,
             InputType = "MultipleChoice",
             Choices = new List<string> { "ÁNO", "NIE" },
             IsDefenseTest = true