peterwind.github.io/index.html at master · peterwind/peterwind.github.io · GitHub

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<!DOCTYPE html>

<html lang="da">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Gangetabel Træning</title>
    <!-- React -->
    <script crossorigin src="https://unpkg.com/react@18/umd/react.production.min.js"></script>
    <script crossorigin src="https://unpkg.com/react-dom@18/umd/react-dom.production.min.js"></script>
    <!-- Babel for JSX -->
    <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
    <!-- Tailwind CSS -->
    <script src="https://cdn.tailwindcss.com"></script>
    <!-- Lucide Icons -->
    <script src="https://unpkg.com/lucide@latest"></script>
</head>
<body>
    <div id="root"></div>
<script type="text/babel">
    const { useState, useEffect, useRef } = React;

    // Icon component using Lucide
    const Icon = ({ name, className = "" }) => {
        useEffect(() => {
            // Replace icons after render
            lucide.createIcons();
        });

        const iconMap = {
            'Trophy': 'trophy',
            'Star': 'star',
            'Target': 'target',
            'Clock': 'clock',
            'CheckCircle': 'check-circle',
            'XCircle': 'x-circle',
            'BarChart3': 'bar-chart-3',
            'Zap': 'zap',
            'Play': 'play',
            'Book': 'book',
            'Settings': 'settings',
            'ArrowLeft': 'arrow-left',
            'Volume2': 'volume-2',
            'VolumeX': 'volume-x',
            'Lightbulb': 'lightbulb'
        };

        return (
            <i
                data-lucide={iconMap[name] || name.toLowerCase()}
                className={className}
            ></i>
        );
    };

    const GangetabelApp = () => {
      // State management
      const [currentMode, setCurrentMode] = useState('menu');

      // Load settings from localStorage
      const [selectedTables, setSelectedTables] = useState(() => {
        const saved = localStorage.getItem('gangetabelSettings');
        return saved ? JSON.parse(saved).selectedTables || [2, 3, 4, 5] : [2, 3, 4, 5];
      });

      const [practiceType, setPracticeType] = useState(() => {
        const saved = localStorage.getItem('gangetabelSettings');
        return saved ? JSON.parse(saved).practiceType || 'multiple' : 'multiple';
      });

      const [practiceLength, setPracticeLength] = useState(() => {
        const saved = localStorage.getItem('gangetabelSettings');
        return saved ? JSON.parse(saved).practiceLength || 10 : 10;
      });

      const [soundEnabled, setSoundEnabled] = useState(() => {
        const saved = localStorage.getItem('gangetabelSettings');
        return saved ? JSON.parse(saved).soundEnabled !== false : true;
      });

      const [currentQuestion, setCurrentQuestion] = useState(null);
      const [userAnswer, setUserAnswer] = useState('');
      const [feedback, setFeedback] = useState(null);
      const [sessionStats, setSessionStats] = useState({ correct: 0, total: 0 });
      const [streak, setStreak] = useState(0);
      const [showNextButton, setShowNextButton] = useState(false);
      const [isSessionActive, setIsSessionActive] = useState(false);
      const [showHint, setShowHint] = useState(false);
      const [hintUsed, setHintUsed] = useState(false);
      const [sessionStartTime, setSessionStartTime] = useState(null);
      const [elapsedTime, setElapsedTime] = useState(0);
      const [toast, setToast] = useState(null);

      // Toast notification system
      const showToast = (message, type = 'info') => {
        setToast({ message, type });
        setTimeout(() => setToast(null), 3000);
      };

      // Modal component
      const Modal = ({ isOpen, onClose, onConfirm, title, message, confirmText = "Ja", cancelText = "Nej" }) => {
        if (!isOpen) return null;

        return (
          <div className="fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center z-50 p-4">
            <div className="bg-white rounded-2xl shadow-2xl p-6 max-w-sm w-full transform transition-all duration-300 scale-100">
              <h3 className="text-xl font-bold mb-3">{title}</h3>
              <p className="text-gray-600 mb-6">{message}</p>
              <div className="flex gap-3 justify-end">
                <button
                  onClick={onClose}
                  className="px-4 py-2 text-gray-600 hover:bg-gray-100 rounded-lg transition-colors"
                >
                  {cancelText}
                </button>
                <button
                  onClick={() => {
                    onConfirm();
                    onClose();
                  }}
                  className="px-4 py-2 bg-red-500 text-white rounded-lg hover:bg-red-600 transition-colors"
                >
                  {confirmText}
                </button>
              </div>
            </div>
          </div>
        );
      };

      const [showResetModal, setShowResetModal] = useState(false);
      const [showEndSessionModal, setShowEndSessionModal] = useState(false);

      // Audio refs
      const correctSoundRef = useRef(null);
      const incorrectSoundRef = useRef(null);
      const clickSoundRef = useRef(null);

      // Progress tracking
      const [progress, setProgress] = useState(() => {
        try {
          const saved = localStorage.getItem('gangetabelProgress');
          return saved ? JSON.parse(saved) : {
            facts: {},
            lastPractice: null
          };
        } catch (e) {
          return {
            facts: {},
            lastPractice: null
          };
        }
      });

      // Save settings whenever they change
      useEffect(() => {
        const settings = {
          selectedTables,
          practiceType,
          practiceLength,
          soundEnabled
        };
        localStorage.setItem('gangetabelSettings', JSON.stringify(settings));
      }, [selectedTables, practiceType, practiceLength, soundEnabled]);

      // Timer for practice sessions
      useEffect(() => {
        let interval;
        if (isSessionActive && sessionStartTime) {
          interval = setInterval(() => {
            setElapsedTime(Math.floor((Date.now() - sessionStartTime) / 1000));
          }, 1000);
        }
        return () => clearInterval(interval);
      }, [isSessionActive, sessionStartTime]);

      // Format time display
      const formatTime = (seconds) => {
        const mins = Math.floor(seconds / 60);
        const secs = seconds % 60;
        return `${mins}:${secs.toString().padStart(2, '0')}`;
      };

      // Initialize audio on component mount
      useEffect(() => {
        // Create simple beep sounds using Web Audio API as data URLs don't work well
        try {
          const AudioContext = window.AudioContext || window.webkitAudioContext;
          if (AudioContext) {
            const createBeep = (frequency, duration) => {
              return () => {
                if (!soundEnabled) return;
                const audioContext = new AudioContext();
                const oscillator = audioContext.createOscillator();
                const gainNode = audioContext.createGain();

                oscillator.connect(gainNode);
                gainNode.connect(audioContext.destination);

                oscillator.frequency.value = frequency;
                oscillator.type = 'sine';

                gainNode.gain.setValueAtTime(0.3, audioContext.currentTime);
                gainNode.gain.exponentialRampToValueAtTime(0.01, audioContext.currentTime + duration);

                oscillator.start(audioContext.currentTime);
                oscillator.stop(audioContext.currentTime + duration);
              };
            };

            window.playCorrectSound = createBeep(800, 0.15);
            window.playIncorrectSound = createBeep(300, 0.25);
            window.playClickSound = createBeep(600, 0.05);
          }
        } catch (e) {
          console.log('Could not initialize audio:', e);
        }
      }, [soundEnabled]);

      // Play sound helper
      const playSound = (type) => {
        if (!soundEnabled) return;

        try {
          if (type === 'correct' && window.playCorrectSound) {
            window.playCorrectSound();
          } else if (type === 'incorrect' && window.playIncorrectSound) {
            window.playIncorrectSound();
          } else if (type === 'click' && window.playClickSound) {
            window.playClickSound();
          }
        } catch (error) {
          console.log('Audio play failed:', error);
        }
      };

      // Vibrate helper
      const vibrate = (pattern) => {
        if (!soundEnabled) return;
        if ('vibrate' in navigator) {
          navigator.vibrate(pattern);
        }
      };

      // Generate hint for multiplication
      const generateHint = (a, b) => {
        const hints = [];

        if (a > 5 && a !== 10) {
          hints.push(`Prøv at dele op: ${a}×${b} = (5×${b}) + (${a-5}×${b}) = ${5*b} + ${(a-5)*b}`);
        }

        if (a === 4 || a === 8) {
          if (a === 4) {
            hints.push(`${a}×${b} er det dobbelte af 2×${b} = ${2*b}, så svaret er ${2*b}×2`);
          } else {
            hints.push(`${a}×${b} er det dobbelte af 4×${b} = ${4*b}, så svaret er ${4*b}×2`);
          }
        }

        if (a === 9) {
          hints.push(`${a}×${b} = (10×${b}) - ${b} = ${10*b} - ${b}`);
        }

        if (b > a) {
          hints.push(`Husk: ${a}×${b} er det samme som ${b}×${a}`);
        }

        if (a === 5) {
          hints.push(`5-tabellen har et mønster: Slutter altid på 0 eller 5`);
        }

        if (a === b) {
          hints.push(`${a}×${b} er et kvadrattal (${a} i anden)`);
        }

        if (hints.length === 0) {
          hints.push(`Tænk på ${a} grupper med ${b} i hver gruppe`);
        }

        return hints[Math.floor(Math.random() * hints.length)];
      };

      // Generate question
      const generateQuestion = () => {
        const now = Date.now();
        let candidates = [];

        selectedTables.forEach(table => {
          for (let i = 1; i <= 10; i++) {
            const key = `${table}x${i}`;
            const fact = progress.facts[key];

            if (!fact || !fact.nextReview || fact.nextReview <= now) {
              candidates.push({ a: table, b: i, priority: fact ? 1 : 2 });
            }
          }
        });

        if (candidates.length < 5) {
          selectedTables.forEach(table => {
            for (let i = 1; i <= 10; i++) {
              if (Math.random() < 0.3) {
                candidates.push({ a: table, b: i, priority: 0 });
              }
            }
          });
        }

        if (candidates.length === 0) {
          selectedTables.forEach(table => {
            for (let i = 1; i <= 10; i++) {
              candidates.push({ a: table, b: i, priority: 0 });
            }
          });
        }

        candidates.sort((a, b) => b.priority - a.priority);
        const question = candidates[Math.floor(Math.random() * Math.min(4, candidates.length))];

        if (question) {
          const correctAnswer = question.a * question.b;
          let options = [correctAnswer];

          while (options.length < 4) {
            const wrongAnswer = correctAnswer + (Math.random() < 0.5 ? -1 : 1) *
                               Math.floor(Math.random() * 10 + 1);
            if (wrongAnswer > 0 && !options.includes(wrongAnswer)) {
              options.push(wrongAnswer);
            }
          }

          options.sort(() => Math.random() - 0.5);

          setCurrentQuestion({
            ...question,
            answer: correctAnswer,
            options: options
          });
        }
      };

      // Handle answer submission
      const handleAnswer = (answer) => {
        playSound('click');
        const isCorrect = answer === currentQuestion.answer;
        const key = `${currentQuestion.a}x${currentQuestion.b}`;

        if (isCorrect) {
          playSound('correct');
          vibrate([50, 100, 50]);
        } else {
          playSound('incorrect');
          vibrate([200]);
        }

        setProgress(prev => {
          const newFacts = { ...prev.facts };
          const fact = newFacts[key] || { correct: 0, attempts: 0 };

          fact.attempts++;
          if (isCorrect) {
            fact.correct++;
            fact.lastSeen = Date.now();

            const accuracy = fact.correct / fact.attempts;
            let interval;
            if (accuracy >= 0.9) {
              interval = 7 * 24 * 60 * 60 * 1000;
            } else if (accuracy >= 0.7) {
              interval = 3 * 24 * 60 * 60 * 1000;
            } else if (accuracy >= 0.5) {
              interval = 24 * 60 * 60 * 1000;
            } else {
              interval = 60 * 60 * 1000;
            }
            fact.nextReview = Date.now() + interval;
          }

          newFacts[key] = fact;

          return {
            ...prev,
            facts: newFacts,
            lastPractice: Date.now()
          };
        });

        setSessionStats(prev => ({
          correct: prev.correct + (isCorrect ? 1 : 0),
          total: prev.total + 1
        }));

        setStreak(isCorrect ? streak + 1 : 0);
        setFeedback({ isCorrect, correctAnswer: currentQuestion.answer });
        setShowNextButton(true);

        if (isCorrect && hintUsed) {
          setHintUsed(false);
        }
      };

      // Handle next question
      const handleNextQuestion = () => {
        setShowNextButton(false);
        setFeedback(null);
        setUserAnswer('');
        setShowHint(false);
        setHintUsed(false);
        generateQuestion();
      };

      // Settings component
      const SettingsPage = () => {
        return (
          <div className="p-4 max-w-md mx-auto">
            <div className="flex items-center gap-4 mb-6">
              <button
                onClick={() => setCurrentMode('menu')}
                className="flex items-center gap-2 text-gray-600 hover:text-gray-900 transition-colors"
              >
                <Icon name="ArrowLeft" className="w-5 h-5" />
                <span>Tilbage</span>
              </button>
              <h2 className="text-2xl font-bold">Indstillinger</h2>
            </div>

            <div className="bg-white rounded-xl shadow-lg p-6 mb-6">
              <h3 className="font-bold text-lg mb-4">Vælg tabeller til øvelser</h3>
              <div className="grid grid-cols-5 gap-2 mb-6">
                {[1,2,3,4,5,6,7,8,9,10].map(n => (
                  <button
                    key={n}
                    onClick={() => {
                      setSelectedTables(prev =>
                        prev.includes(n)
                          ? prev.filter(t => t !== n)
                          : [...prev, n]
                      );
                    }}
                    className={`p-3 rounded-lg font-medium transition-all ${
                      selectedTables.includes(n)
                        ? 'bg-blue-500 text-white'
                        : 'bg-gray-100 hover:bg-gray-200'
                    }`}
                  >
                    {n}
                  </button>
                ))}
              </div>
              <p className="text-sm text-gray-600">
                Valgte tabeller: {selectedTables.sort((a,b) => a-b).join(', ')}
              </p>
            </div>

            <div className="bg-white rounded-xl shadow-lg p-6 mb-6">
              <h3 className="font-bold text-lg mb-4">Øvelsestype</h3>
              <div className="space-y-3">
                <label className="flex items-center p-3 rounded-lg cursor-pointer hover:bg-gray-50">
                  <input
                    type="radio"
                    checked={practiceType === 'multiple'}
                    onChange={() => setPracticeType('multiple')}
                    className="mr-3"
                  />
                  <div>
                    <p className="font-medium">Valgmuligheder</p>
                    <p className="text-sm text-gray-600">Vælg mellem 4 mulige svar</p>
                  </div>
                </label>
                <label className="flex items-center p-3 rounded-lg cursor-pointer hover:bg-gray-50">
                  <input
                    type="radio"
                    checked={practiceType === 'input'}
                    onChange={() => setPracticeType('input')}
                    className="mr-3"
                  />
                  <div>
                    <p className="font-medium">Indtast svar</p>
                    <p className="text-sm text-gray-600">Skriv svaret selv</p>
                  </div>
                </label>
              </div>
            </div>

            <div className="bg-white rounded-xl shadow-lg p-6 mb-6">
              <h3 className="font-bold text-lg mb-4">Antal opgaver per øvelse</h3>
              <div className="space-y-3">
                {[5, 10, 15, 20].map(num => (
                  <label key={num} className="flex items-center p-3 rounded-lg cursor-pointer hover:bg-gray-50">
                    <input
                      type="radio"
                      checked={practiceLength === num}
                      onChange={() => setPracticeLength(num)}
                      className="mr-3"
                    />
                    <div>
                      <p className="font-medium">{num} opgaver</p>
                      <p className="text-sm text-gray-600">
                        {num === 5 && 'Hurtig øvelse'}
                        {num === 10 && 'Standard øvelse'}
                        {num === 15 && 'Længere øvelse'}
                        {num === 20 && 'Grundig øvelse'}
                      </p>
                    </div>
                  </label>
                ))}
              </div>
            </div>

            <div className="bg-white rounded-xl shadow-lg p-6 mb-6">
              <h3 className="font-bold text-lg mb-4">Lyd og vibration</h3>
              <label className="flex items-center p-3 rounded-lg cursor-pointer hover:bg-gray-50">
                <input
                  type="checkbox"
                  checked={soundEnabled}
                  onChange={(e) => {
                    setSoundEnabled(e.target.checked);
                    if (e.target.checked) {
                      playSound('click');
                    }
                  }}
                  className="mr-3"
                />
                <div className="flex items-center gap-3">
                  <Icon name={soundEnabled ? "Volume2" : "VolumeX"} className={`w-5 h-5 ${soundEnabled ? 'text-blue-500' : 'text-gray-400'}`} />
                  <div>
                    <p className="font-medium">Lyd og vibration aktiveret</p>
                    <p className="text-sm text-gray-600">Lydeffekter og haptisk feedback</p>
                  </div>
                </div>
              </label>
            </div>

            <button
              onClick={() => setShowResetModal(true)}
              className="w-full p-3 text-red-600 bg-red-50 rounded-xl hover:bg-red-100 transition-colors"
            >
              Nulstil alle fremskridt
            </button>

            <Modal
              isOpen={showResetModal}
              onClose={() => setShowResetModal(false)}
              onConfirm={() => {
                setProgress({
                  facts: {},
                  lastPractice: null
                });
                showToast('Alle fremskridt er blevet nulstillet', 'success');
              }}
              title="Nulstil fremskridt?"
              message="Er du sikker på at du vil slette alle dine fremskridt? Dette kan ikke fortrydes."
              confirmText="Ja, nulstil"
              cancelText="Annuller"
            />
          </div>
        );
      };

      // Lookup table component
      const LookupTable = () => {
        const [selectedTable, setSelectedTable] = useState(5);

        return (
          <div className="p-4 max-w-md mx-auto">
            <div className="flex items-center gap-4 mb-6">
              <button
                onClick={() => setCurrentMode('menu')}
                className="flex items-center gap-2 text-gray-600 hover:text-gray-900 transition-colors"
              >
                <Icon name="ArrowLeft" className="w-5 h-5" />
                <span>Tilbage</span>
              </button>
              <h2 className="text-2xl font-bold">Gangetabeller</h2>
            </div>

            <div className="flex gap-2 mb-6 flex-wrap">
              {[1,2,3,4,5,6,7,8,9,10].map(n => (
                <button
                  key={n}
                  onClick={() => setSelectedTable(n)}
                  className={`px-4 py-2 rounded-lg font-medium transition-all ${
                    selectedTable === n
                      ? 'bg-blue-500 text-white transform scale-110'
                      : 'bg-gray-100 hover:bg-gray-200'
                  }`}
                >
                  {n}
                </button>
              ))}
            </div>

            <div className="bg-white rounded-lg shadow-lg p-6">
              <h3 className="text-xl font-bold mb-4 text-center text-blue-600">{selectedTable}-tabellen</h3>
              <div className="grid grid-cols-2 gap-3">
                {[1,2,3,4,5,6,7,8,9,10].map(i => {
                  const key = `${selectedTable}x${i}`;
                  const fact = progress.facts[key];
                  const isLearned = fact && fact.correct / fact.attempts >= 0.8 && fact.attempts >= 3;

                  return (
                    <div key={i} className={`p-3 rounded-lg text-center transition-all ${
                      isLearned ? 'bg-green-50 border-2 border-green-200' : 'bg-gray-50'
                    }`}>
                      <span className="text-lg font-medium">
                        {selectedTable} × {i} = {selectedTable * i}
                      </span>
                      {isLearned && (
                        <Icon name="Star" className="w-4 h-4 text-green-500 mx-auto mt-1" />
                      )}
                    </div>
                  );
                })}
              </div>
            </div>
          </div>
        );
      };

      // Practice component
      const Practice = () => {
        useEffect(() => {
          if (!isSessionActive) {
            generateQuestion();
            setSessionStats({ correct: 0, total: 0 });
            setStreak(0);
            setShowHint(false);
            setHintUsed(false);
            setSessionStartTime(Date.now());
            setElapsedTime(0);
            setIsSessionActive(true);
          }
        }, [isSessionActive]);

        const handleEndSession = () => {
          if (sessionStats.total === 0) {
            setIsSessionActive(false);
            setFeedback(null);
            setShowNextButton(false);
            setCurrentMode('menu');
          } else {
            setShowEndSessionModal(true);
          }
        };

        if (!currentQuestion) return null;

        const progressPercentage = (sessionStats.total / practiceLength) * 100;

        return (
          <div className="p-4 max-w-md mx-auto">
            <div className="flex justify-between items-center mb-4">
              <button
                onClick={handleEndSession}
                className="flex items-center gap-2 text-gray-600 hover:text-gray-900 transition-colors"
              >
                <Icon name="ArrowLeft" className="w-5 h-5" />
                <span>Afslut</span>
              </button>

              <div className="flex items-center gap-4">
                <div className="flex items-center gap-1 bg-gray-50 px-3 py-1 rounded-full">
                  <Icon name="Clock" className="w-4 h-4 text-gray-500" />
                  <span className="font-medium">{formatTime(elapsedTime)}</span>
                </div>
                <div className="flex items-center gap-1 bg-blue-50 px-3 py-1 rounded-full">
                  <Icon name="Target" className="w-4 h-4 text-blue-500" />
                  <span className="font-medium">{sessionStats.correct}/{sessionStats.total}</span>
                </div>
                {streak > 2 && (
                  <div className="flex items-center gap-1 bg-yellow-50 px-3 py-1 rounded-full animate-pulse">
                    <Icon name="Zap" className="w-4 h-4 text-yellow-500" />
                    <span className="font-medium">{streak}</span>
                  </div>
                )}
              </div>
            </div>

            <div className="mb-6">
              <div className="flex justify-between text-sm text-gray-600 mb-1">
                <span>Opgave {sessionStats.total + 1} af {practiceLength}</span>
                <span>{Math.round(progressPercentage)}%</span>
              </div>
              <div className="w-full bg-gray-200 rounded-full h-3">
                <div
                  className="bg-gradient-to-r from-blue-400 to-blue-600 h-3 rounded-full transition-all duration-300"
                  style={{ width: `${progressPercentage}%` }}
                />
              </div>
            </div>

            <div className="bg-white rounded-lg shadow-lg p-8 mb-6">
              <h2 className="text-4xl font-bold text-center mb-8">
                {currentQuestion.a} × {currentQuestion.b} = ?
              </h2>

              {practiceType === 'multiple' ? (
                <div className="grid grid-cols-2 gap-4">
                  {currentQuestion.options.map((option, idx) => (
                    <button
                      key={idx}
                      onClick={() => {
                        if (!feedback) {
                          handleAnswer(option);
                        }
                      }}
                      disabled={feedback !== null}
                      className={`p-4 text-xl font-medium rounded-lg transition-all ${
                        feedback && option === currentQuestion.answer
                          ? 'bg-green-500 text-white transform scale-105'
                          : feedback && option !== currentQuestion.answer
                          ? 'bg-gray-200 text-gray-400'
                          : 'bg-blue-100 hover:bg-blue-200 text-blue-900 hover:transform hover:scale-105'
                      }`}
                    >
                      {option}
                    </button>
                  ))}
                </div>
              ) : (
                <div className="flex flex-col items-center gap-4">
                  <input
                    type="number"
                    inputMode="numeric"
                    pattern="[0-9]*"
                    value={userAnswer}
                    onChange={(e) => setUserAnswer(e.target.value)}
                    onKeyPress={(e) => {
                      if (e.key === 'Enter' && userAnswer && !feedback) {
                        handleAnswer(parseInt(userAnswer));
                      }
                    }}
                    disabled={feedback !== null}
                    className="w-32 p-4 text-2xl text-center border-2 border-gray-300 rounded-lg focus:border-blue-500 focus:outline-none"
                    autoFocus
                  />
                  {!feedback && (
                    <button
                      onClick={() => {
                        handleAnswer(parseInt(userAnswer));
                      }}
                      disabled={!userAnswer || feedback !== null}
                      className="px-6 py-3 bg-blue-500 text-white rounded-lg font-medium disabled:bg-gray-300 hover:bg-blue-600 transition-colors"
                    >
                      Svar
                    </button>
                  )}
                </div>
              )}

              {!feedback && !showHint && sessionStats.total > 0 && (
                <div className="mt-6 text-center">
                  <button
                    onClick={() => {
                      playSound('click');
                      setShowHint(true);
                      setHintUsed(true);
                    }}
                    className="flex items-center gap-2 mx-auto px-4 py-2 text-sm bg-yellow-100 text-yellow-800 rounded-lg hover:bg-yellow-200 transition-colors"
                  >
                    <Icon name="Lightbulb" className="w-4 h-4" />
                    Få et hint
                  </button>
                </div>
              )}

              {showHint && !feedback && (
                <div className="mt-4 p-3 bg-yellow-50 border border-yellow-200 rounded-lg text-sm text-yellow-800">
                  <p className="font-medium mb-1">💡 Hint:</p>
                  <p>{generateHint(currentQuestion.a, currentQuestion.b)}</p>
                </div>
              )}

              {feedback && (
                <div className={`mt-6 p-4 rounded-lg text-center ${
                  feedback.isCorrect ? 'bg-green-100' : 'bg-red-100'
                }`}>
                  {feedback.isCorrect ? (
                    <div className="flex items-center justify-center gap-2 text-green-700">
                      <Icon name="CheckCircle" className="w-6 h-6" />
                      <span className="text-lg font-medium">
                        {hintUsed ? 'Godt klaret med hjælp!' : 'Rigtigt! Fantastisk!'}
                      </span>
                    </div>
                  ) : (
                    <div className="text-red-700">
                      <Icon name="XCircle" className="w-6 h-6 mx-auto mb-2" />
                      <p className="font-medium">Ikke helt...</p>
                      <p className="text-lg mt-1">
                        {currentQuestion.a} × {currentQuestion.b} = {feedback.correctAnswer}
                      </p>
                      {!hintUsed && (
                        <p className="text-sm mt-2 text-gray-600">
                          Tip: Prøv at bruge hint-knappen næste gang!
                        </p>
                      )}
                    </div>
                  )}
                </div>
              )}

              {showNextButton && (
                <div className="mt-6 text-center">
                  <button
                    onClick={() => {
                      playSound('click');
                      if (sessionStats.total >= practiceLength - 1) {
                        const finalScore = sessionStats.correct + (feedback.isCorrect ? 1 : 0);
                        showToast(`Fantastisk! Du fik ${finalScore} ud af ${practiceLength} rigtige!`, 'success');
                        setTimeout(() => {
                          handleEndSession();
                        }, 1500);
                      } else {
                        handleNextQuestion();
                      }
                    }}
                    className="px-6 py-3 bg-blue-500 text-white rounded-lg font-medium hover:bg-blue-600 transition-colors"
                  >
                    {sessionStats.total >= practiceLength - 1 ? 'Afslut øvelse' : 'Næste opgave →'}
                  </button>
                </div>
              )}
            </div>

            <Modal
              isOpen={showEndSessionModal}
              onClose={() => setShowEndSessionModal(false)}
              onConfirm={() => {
                setIsSessionActive(false);
                setFeedback(null);
                setShowNextButton(false);
                setCurrentMode('menu');
              }}
              title="Afslut øvelse?"
              message="Er du sikker på at du vil afslutte øvelsen?"
              confirmText="Ja, afslut"
              cancelText="Fortsæt"
            />
          </div>
        );
      };

      // Stats component
      const Stats = () => {
        // Calculate stats per table
        const getTableStats = (tableNumber) => {
          let correct = 0;
          let incorrect = 0;

          for (let i = 1; i <= 10; i++) {
            const key = `${tableNumber}x${i}`;
            const fact = progress.facts[key];
            if (fact) {
              correct += fact.correct;
              incorrect += (fact.attempts - fact.correct);
            }
          }

          return { correct, incorrect, total: correct + incorrect };
        };

        // Get overall stats
        const getOverallStats = () => {
          let totalCorrect = 0;
          let totalIncorrect = 0;

          Object.values(progress.facts).forEach(fact => {
            totalCorrect += fact.correct;
            totalIncorrect += (fact.attempts - fact.correct);
          });

          return {
            correct: totalCorrect,
            incorrect: totalIncorrect,
            total: totalCorrect + totalIncorrect
          };
        };

        const overallStats = getOverallStats();

        return (
          <div className="p-4 max-w-md mx-auto">
            <div className="flex items-center gap-4 mb-6">
              <button
                onClick={() => setCurrentMode('menu')}
                className="flex items-center gap-2 text-gray-600 hover:text-gray-900 transition-colors"
              >
                <Icon name="ArrowLeft" className="w-5 h-5" />
                <span>Tilbage</span>
              </button>
              <h2 className="text-2xl font-bold">Statistik</h2>
            </div>

            {/* Overall stats */}
            <div className="bg-gradient-to-r from-blue-500 to-blue-600 text-white rounded-lg p-6 mb-6">
              <h3 className="text-lg font-medium mb-3">Samlet statistik</h3>
              <div className="grid grid-cols-3 gap-4 text-center">
                <div>
                  <p className="text-3xl font-bold">{overallStats.correct}</p>
                  <p className="text-sm text-blue-100">Rigtige</p>
                </div>
                <div>
                  <p className="text-3xl font-bold">{overallStats.incorrect}</p>
                  <p className="text-sm text-blue-100">Forkerte</p>
                </div>
                <div>
                  <p className="text-3xl font-bold">
                    {overallStats.total > 0
                      ? Math.round((overallStats.correct / overallStats.total) * 100)
                      : 0}%
                  </p>
                  <p className="text-sm text-blue-100">Korrekt</p>
                </div>
              </div>
            </div>

            {/* Stats per table */}
            <div className="bg-white rounded-lg shadow p-4">
              <h3 className="font-bold mb-4">Statistik per tabel</h3>
              <div className="space-y-3">
                {[1,2,3,4,5,6,7,8,9,10].map(table => {
                  const stats = getTableStats(table);
                  const percentage = stats.total > 0
                    ? Math.round((stats.correct / stats.total) * 100)
                    : 0;

                  return (
                    <div key={table} className="border-b border-gray-100 pb-3 last:border-0">
                      <div className="flex items-center justify-between mb-2">
                        <span className="font-medium">{table}-tabellen</span>
                        {stats.total > 0 && (
                          <span className={`text-sm font-medium ${
                            percentage >= 80 ? 'text-green-600' :
                            percentage >= 60 ? 'text-yellow-600' :
                            'text-red-600'
                          }`}>
                            {percentage}%
                          </span>
                        )}
                      </div>
                      <div className="flex items-center gap-4 text-sm">
                        <span className="text-green-600">
                          ✓ {stats.correct} rigtige
                        </span>
                        <span className="text-red-600">
                          ✗ {stats.incorrect} forkerte
                        </span>
                        {stats.total === 0 && (
                          <span className="text-gray-400">Ikke øvet endnu</span>
                        )}
                      </div>
                      {stats.total > 0 && (
                        <div className="w-full bg-gray-200 rounded-full h-2 mt-2">
                          <div
                            className={`h-2 rounded-full transition-all duration-500 ${
                              percentage >= 80 ? 'bg-green-500' :
                              percentage >= 60 ? 'bg-yellow-500' :
                              'bg-red-500'
                            }`}
                            style={{ width: `${percentage}%` }}
                          />
                        </div>
                      )}
                    </div>
                  );
                })}
              </div>
            </div>

            {/* Reset button */}
            <button
              onClick={() => {
                if (window.confirm('Er du sikker på at du vil nulstille al statistik?')) {
                  setProgress({
                    facts: {},
                    lastPractice: null
                  });
                  alert('Al statistik er blevet nulstillet!');
                }
              }}
              className="mt-6 w-full p-3 text-red-600 bg-red-50 rounded-lg hover:bg-red-100 transition-colors"
            >
              Nulstil al statistik
            </button>
          </div>
        );
      };

      // Main menu
      const MainMenu = () => (
        <div className="p-4 max-w-md mx-auto">
          <div className="text-center mb-8">
            <h1 className="text-4xl font-bold mb-3 bg-gradient-to-r from-blue-600 to-purple-600 bg-clip-text text-transparent">
              Gangetabel Træning
            </h1>
            <p className="text-gray-600">Lær gangetabellerne på en sjov måde!</p>

            {selectedTables.length === 0 && (
              <div className="mt-4 p-3 bg-amber-50 text-amber-800 rounded-lg text-sm">