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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Math Equation Solver</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f4f7f6;
            margin: 0;
            padding: 40px;
            color: #333;
        }
        h1 {
            text-align: center;
            color: #2c3e50;
            margin-bottom: 30px;
        }
        #game-container {
            max-width: 900px;
            margin: 0 auto;
            background: #fff;
            padding: 20px 30px;
            border-radius: 10px;
            box-shadow: 0 4px 10px rgba(0,0,0,0.1);
        }
        .equation-row {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 15px;
            padding: 15px 0;
            border-bottom: 1px solid #eee;
        }
        .equation-row:last-child {
            border-bottom: none;
        }
        .equation-text {
            font-family: "Courier New", Courier, monospace;
            font-size: 1.15em;
            font-weight: bold;
            flex: 1;
            min-width: 320px;
            color: #2980b9;
        }
        .input-box {
            width: 80px;
            padding: 8px;
            font-size: 1em;
            border: 1px solid #ccc;
            border-radius: 5px;
            text-align: center;
        }
        .btn {
            padding: 8px 15px;
            font-size: 1em;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-weight: bold;
            transition: background 0.3s;
        }
        .btn-start {
            background-color: #f39c12;
            color: #fff;
        }
        .btn-start:hover { background-color: #e67e22; }
        .btn-check {
            background-color: #27ae60;
            color: #fff;
        }
        .btn-check:hover { background-color: #219150; }
        .btn-check:disabled, .btn-start:disabled {
            background-color: #95a5a6;
            cursor: not-allowed;
        }
        .btn-refresh {
            background-color: #3498db;
            color: #fff;
            display: none;
        }
        .btn-refresh:hover { background-color: #2980b9; }
        .timer {
            font-family: monospace;
            font-size: 1.1em;
            color: #e74c3c;
            min-width: 65px;
        }
        .feedback {
            font-weight: bold;
            min-width: 170px;
        }
        .correct { color: #27ae60; }
        .incorrect { color: #c0392b; }
        
        #score-container {
            max-width: 900px;
            margin: 20px auto 0;
            background: #e8f8f5;
            padding: 15px 30px;
            border-radius: 10px;
            border: 2px solid #1abc9c;
            text-align: center;
            font-size: 1.5em;
            font-weight: bold;
            color: #16a085;
            box-shadow: 0 4px 10px rgba(0,0,0,0.05);
        }
    </style>
</head>
<body>
    <h1>Solve the Equations</h1>
    <div id="game-container"></div>
    
    <div id="score-container">
        Total Score: <span id="total-score">0</span>
    </div>
    <script>
        const activeEquations = new Set();
        const TOTAL_EQUATIONS = 6;
        let globalScore = 0; 
        function generateEquationLogic() {
            // Pattern 1/x for percentage
            const x = Math.floor(Math.random() * 24) + 2;
            let P_str = (100 / x).toFixed(2);
            if (P_str.endsWith('.00')) {
                P_str = P_str.slice(0, -3); 
            }
            // Generate 11-99 for multipliers and divisor
            let A = Math.floor(Math.random() * 89) + 11;
            let B = Math.floor(Math.random() * 89) + 11;
            let D = Math.floor(Math.random() * 89) + 11;
            let E = Math.floor(Math.random() * 89) + 11;
            // Guarantee an integer result for the percentage/division chunk
            let C_mult = Math.floor(Math.random() * 5) + 1;
            let C = x * D * C_mult;
            // Ensure the final result is positive
            while ((A * B) <= (C_mult * E)) {
                A = Math.floor(Math.random() * 89) + 11;
                B = Math.floor(Math.random() * 89) + 11;
            }
            // Calculate final integer answer
            const answer = (A * B) - (C_mult * E);
            const text = `${A} * ${B} - ${P_str}% ${C} / ${D} * ${E}`;
            return { text, answer };
        }
        function getUniqueEquation() {
            let eq;
            do {
                eq = generateEquationLogic();
            } while (activeEquations.has(eq.text));
            return eq;
        }
        function createRow(container) {
            const row = document.createElement('div');
            row.className = 'equation-row';
            let eqData = getUniqueEquation();
            activeEquations.add(eqData.text);
            // Create UI elements
            const eqText = document.createElement('div');
            eqText.className = 'equation-text';
            eqText.textContent = eqData.text;
            const startBtn = document.createElement('button');
            startBtn.className = 'btn btn-start';
            startBtn.textContent = 'Start Timer';
            const input = document.createElement('input');
            input.type = 'number';
            input.className = 'input-box';
            input.placeholder = '?';
            input.disabled = true; // Disabled until start is clicked
            const checkBtn = document.createElement('button');
            checkBtn.className = 'btn btn-check';
            checkBtn.textContent = 'Check';
            checkBtn.disabled = true; // Disabled until start is clicked
            const refreshBtn = document.createElement('button');
            refreshBtn.className = 'btn btn-refresh';
            refreshBtn.textContent = 'Refresh';
            const timerDiv = document.createElement('div');
            timerDiv.className = 'timer';
            timerDiv.textContent = '00:00';
            const feedbackDiv = document.createElement('div');
            feedbackDiv.className = 'feedback';
            let seconds = 0;
            let timerInterval;
            // --- Start Timer Logic ---
            startBtn.addEventListener('click', () => {
                input.disabled = false;
                checkBtn.disabled = false;
                startBtn.style.display = 'none'; 
                
                input.focus(); 
                timerInterval = setInterval(() => {
                    seconds++;
                    const mins = String(Math.floor(seconds / 60)).padStart(2, '0');
                    const secs = String(seconds % 60).padStart(2, '0');
                    timerDiv.textContent = `${mins}:${secs}`;
                }, 1000);
            });
            // --- Check Button Logic ---
            checkBtn.addEventListener('click', () => {
                if (input.value === '') return;
                clearInterval(timerInterval); 
                const userAnswer = parseInt(input.value, 10);
                if (userAnswer === eqData.answer) {
                    const pointsEarned = Math.max(10, 100 - seconds);
                    globalScore += pointsEarned;
                    document.getElementById('total-score').textContent = globalScore;
                    
                    feedbackDiv.textContent = `You got right (+${pointsEarned})`;
                    feedbackDiv.className = 'feedback correct';
                } else {
                    feedbackDiv.textContent = `Correct answer is ${eqData.answer}`;
                    feedbackDiv.className = 'feedback incorrect';
                }
                input.disabled = true;
                checkBtn.disabled = true;
                refreshBtn.style.display = 'inline-block'; 
            });
            // --- Refresh Button Logic ---
            refreshBtn.addEventListener('click', () => {
                activeEquations.delete(eqData.text); 
                eqData = getUniqueEquation(); 
                activeEquations.add(eqData.text);
                eqText.textContent = eqData.text;
                input.value = '';
                input.disabled = true; 
                checkBtn.disabled = true; 
                
                feedbackDiv.textContent = '';
                refreshBtn.style.display = 'none'; 
                startBtn.style.display = 'inline-block'; 
                seconds = 0;
                timerDiv.textContent = '00:00';
                clearInterval(timerInterval);
            });
            // Append everything to the row
            row.appendChild(eqText);
            row.appendChild(startBtn);
            row.appendChild(input);
            row.appendChild(checkBtn);
            row.appendChild(refreshBtn);
            row.appendChild(timerDiv);
            row.appendChild(feedbackDiv);
            
            container.appendChild(row);
        }
        // Initialize equations when the page loads
        document.addEventListener("DOMContentLoaded", function() {
            const gameContainer = document.getElementById('game-container');
            if (gameContainer) {
                for (let i = 0; i < TOTAL_EQUATIONS; i++) {
                    createRow(gameContainer);
                }
            }
        });
    </script>
</body>
</html>

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