* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 800px;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 30px;
    text-align: center;
}

header h1 {
    font-size: 2rem;
    font-weight: 600;
}

.screen {
    display: none;
    padding: 40px;
    min-height: 400px;
}

.screen.active {
    display: block;
}

/* Quiz Selection Screen */
.quiz-list {
    display: grid;
    gap: 20px;
    margin-top: 30px;
}

.quiz-card {
    background: #f8f9fa;
    border: 2px solid #e9ecef;
    border-radius: 12px;
    padding: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.quiz-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    border-color: #667eea;
}

.quiz-card h3 {
    color: #333;
    font-size: 1.5rem;
    margin-bottom: 10px;
}

.quiz-card p {
    color: #666;
    font-size: 1rem;
    margin-bottom: 15px;
}

.quiz-card .quiz-meta {
    display: flex;
    gap: 20px;
    color: #888;
    font-size: 0.9rem;
}

/* Quiz Playing Screen */
.quiz-header {
    margin-bottom: 40px;
}

#quiz-title {
    color: #333;
    font-size: 1.8rem;
    margin-bottom: 20px;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: #e9ecef;
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 15px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    transition: width 0.3s ease;
}

.question-counter {
    text-align: center;
    color: #666;
    font-size: 1.1rem;
    font-weight: 500;
}

.question-container {
    margin-bottom: 40px;
}

.question-text {
    color: #333;
    font-size: 1.4rem;
    line-height: 1.6;
    margin-bottom: 30px;
}

.answers-container {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.answer-option {
    background: #f8f9fa;
    border: 2px solid #e9ecef;
    border-radius: 12px;
    padding: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1.1rem;
    text-align: start;
}

.answer-option:hover {
    background: #e9ecef;
    border-color: #667eea;
}

.answer-option.selected {
    background: #667eea;
    color: white;
    border-color: #667eea;
}

.answer-option.correct {
    background: #28a745;
    color: white;
    border-color: #28a745;
}

.answer-option.incorrect {
    background: #dc3545;
    color: white;
    border-color: #dc3545;
}

.answer-option.disabled {
    cursor: not-allowed;
    opacity: 0.7;
}

/* Question Images */
.question-image {
    display: block;
    max-width: 100%;
    max-height: 300px;
    margin: 20px auto;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    object-fit: contain;
}

/* Matching Question Styles */
.matching-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.matching-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    align-items: center;
    padding: 15px;
    background: #f8f9fa;
    border: 2px solid #e9ecef;
    border-radius: 12px;
    transition: all 0.3s ease;
}

.matching-row.correct {
    background: #d4edda;
    border-color: #28a745;
}

.matching-row.incorrect {
    background: #f8d7da;
    border-color: #dc3545;
}

.matching-left-item {
    font-size: 1.1rem;
    font-weight: 500;
    color: #333;
}

.matching-select-wrapper {
    position: relative;
}

.matching-select {
    width: 100%;
    padding: 12px 15px;
    font-size: 1rem;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    background: white;
    cursor: pointer;
    transition: all 0.3s ease;
}

.matching-select:hover:not(:disabled) {
    border-color: #667eea;
}

.matching-select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.matching-select:disabled {
    cursor: not-allowed;
    opacity: 0.7;
    background: #f8f9fa;
}

.matching-select option:disabled {
    color: #ccc;
}

.correct-answer-hint {
    grid-column: 2;
    color: #28a745;
    font-weight: 600;
    font-size: 0.95rem;
    margin-top: -10px;
}

.navigation-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.btn {
    padding: 15px 40px;
    font-size: 1.1rem;
    font-weight: 600;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* Results Screen */
.results-container {
    text-align: center;
}

.results-container h2 {
    color: #333;
    font-size: 2rem;
    margin-bottom: 30px;
}

.score-display {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 40px;
    border-radius: 15px;
    margin-bottom: 30px;
}

.score-label {
    font-size: 1.2rem;
    margin-bottom: 10px;
    opacity: 0.9;
}

.score-value {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.score-percentage {
    font-size: 1.5rem;
    font-weight: 600;
}

.results-summary {
    background: #f8f9fa;
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 30px;
    text-align: start;
}

.result-item {
    padding: 15px 0;
    border-bottom: 1px solid #e9ecef;
}

.result-item:last-child {
    border-bottom: none;
}

.result-question {
    font-weight: 600;
    color: #333;
    margin-bottom: 8px;
}

.result-answer {
    color: #666;
    margin-left: 20px;
}

.result-answer.correct {
    color: #28a745;
}

.result-answer.incorrect {
    color: #dc3545;
}

.result-image {
    display: block;
    max-width: 100%;
    max-height: 200px;
    margin: 15px auto;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    object-fit: contain;
}

.matching-result-details {
    margin-top: 15px;
    padding: 15px;
    background: white;
    border-radius: 8px;
}

.matching-result-item {
    padding: 10px;
    margin-bottom: 8px;
    border-radius: 6px;
}

.matching-result-item.correct {
    background: #d4edda;
    color: #155724;
}

.matching-result-item.incorrect {
    background: #f8d7da;
    color: #721c24;
}

.matching-result-item:last-child {
    margin-bottom: 0;
}

.correct-hint {
    color: #28a745;
    font-size: 0.9rem;
    font-weight: 600;
}

/* RTL Support */
[dir="rtl"] {
    direction: rtl;
}

[dir="rtl"] .answer-option,
[dir="rtl"] .question-text,
[dir="rtl"] .quiz-card h3,
[dir="rtl"] .quiz-card p {
    text-align: right;
}

[dir="rtl"] .result-answer {
    margin-left: 0;
    margin-right: 20px;
}

/* Responsive Design */
@media (max-width: 600px) {
    header h1 {
        font-size: 1.5rem;
    }

    .screen {
        padding: 20px;
    }

    #quiz-title {
        font-size: 1.4rem;
    }

    .question-text {
        font-size: 1.2rem;
    }

    .answer-option {
        padding: 15px;
        font-size: 1rem;
    }

    .score-value {
        font-size: 2rem;
    }

    .matching-row {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .correct-answer-hint {
        grid-column: 1;
        margin-top: 5px;
    }
}