/* Linux Quiz Application Styles */

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

/* Header Styles */
header {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
}

header h1 {
    text-align: center;
    color: #4a5568;
    font-size: 2.5rem;
    font-weight: 300;
}

/* Quiz Info Styles */
.quiz-info {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
}

.progress {
    display: flex;
    justify-content: space-around;
    margin-bottom: 15px;
    font-weight: 600;
}

.progress span {
    background: #f7fafc;
    padding: 8px 16px;
    border-radius: 20px;
    color: #4a5568;
}

.requirements {
    display: flex;
    justify-content: space-around;
    gap: 10px;
    flex-wrap: wrap;
}

.requirement {
    padding: 6px 12px;
    border-radius: 15px;
    font-size: 0.9rem;
    font-weight: 500;
}

.requirement.pending {
    background: #fed7d7;
    color: #c53030;
}

.requirement.met {
    background: #c6f6d5;
    color: #2f855a;
}

/* Quiz Container Styles */
.quiz-container {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
}

.quiz-container.hidden {
    display: none;
}

.question-section {
    margin-bottom: 30px;
}

.question-section h2 {
    color: #2d3748;
    font-size: 1.5rem;
    line-height: 1.6;
    text-align: center;
    font-weight: 400;
}

/* Visual Layout Image Styles */
.question-visual {
    display: block;
    max-width: 100%;
    height: auto;
    margin: 20px auto;
    border: 2px solid #cbd5e0;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

/* Test Mode Styles */
.all-questions-container {
    margin-bottom: 30px;
}

.test-question {
    background: #f7fafc;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
}

.test-question h3 {
    color: #2d3748;
    font-size: 1.2rem;
    margin-bottom: 15px;
    font-weight: 500;
}

.test-answers {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.test-answer-option {
    display: flex;
    align-items: center;
    padding: 10px 15px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    background: #ffffff;
    cursor: pointer;
    transition: all 0.3s ease;
}

.test-answer-option:hover {
    border-color: #667eea;
    background: #f7fafc;
}

.test-answer-option.selected {
    border-color: #667eea;
    background: #e6f3ff;
}

.test-answer-checkbox {
    margin-right: 10px;
    width: 16px;
    height: 16px;
}

.test-answer-label {
    flex: 1;
    font-size: 1rem;
    color: #4a5568;
    cursor: pointer;
}

.test-answer-option.correct-answer {
    background: #c6f6d5;
    border-color: #48bb78;
    color: #2f855a;
    animation: correctPulse 0.6s ease-in-out;
}

.test-answer-option.incorrect-answer {
    background: #fed7d7;
    border-color: #f56565;
    color: #c53030;
    animation: incorrectShake 0.6s ease-in-out;
}

.test-controls {
    text-align: center;
    margin-top: 30px;
}

.calculate-grade-button {
    background: #667eea;
    color: white;
    border: none;
    padding: 15px 40px;
    border-radius: 25px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.calculate-grade-button:hover {
    background: #5a67d8;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

/* Grade Result Styles */
.grade-result {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 40px;
    text-align: center;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
}

.grade-result.hidden {
    display: none;
}

.grade-result h2 {
    color: #4a5568;
    font-size: 2rem;
    margin-bottom: 20px;
}

.grade-display {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border-radius: 50%;
    width: 120px;
    height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 3rem;
    font-weight: bold;
    box-shadow: 0 8px 32px rgba(102, 126, 234, 0.3);
}

/* Answers Styles */
.answers-container {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 30px;
}

.answer-button {
    padding: 15px 20px;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    background: #ffffff;
    color: #4a5568;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: left;
}

.answer-button:hover:not(:disabled) {
    border-color: #667eea;
    background: #f7fafc;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.15);
}

.answer-button:disabled {
    cursor: not-allowed;
}

.answer-button.correct-answer {
    background: #c6f6d5;
    border-color: #48bb78;
    color: #2f855a;
    animation: correctPulse 0.6s ease-in-out;
}

.answer-button.incorrect-answer {
    background: #fed7d7;
    border-color: #f56565;
    color: #c53030;
    animation: incorrectShake 0.6s ease-in-out;
}

/* Multiple Choice Styles */
.answer-container {
    display: flex;
    align-items: center;
    padding: 15px 20px;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    background: #ffffff;
    transition: all 0.3s ease;
    cursor: pointer;
}

.answer-container:hover {
    border-color: #667eea;
    background: #f7fafc;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.15);
}

.answer-container.correct-answer {
    background: #c6f6d5;
    border-color: #48bb78;
    color: #2f855a;
    animation: correctPulse 0.6s ease-in-out;
}

.answer-container.incorrect-answer {
    background: #fed7d7;
    border-color: #f56565;
    color: #c53030;
    animation: incorrectShake 0.6s ease-in-out;
}

.answer-checkbox {
    margin-right: 15px;
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.answer-checkbox:disabled {
    cursor: not-allowed;
}

.answer-label {
    flex: 1;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    color: #4a5568;
}

.submit-button {
    background: #667eea;
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 25px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 10px;
    align-self: center;
}

.submit-button:hover {
    background: #5a67d8;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

/* Feedback Styles */
.feedback-section {
    text-align: center;
}

.feedback {
    margin-bottom: 20px;
    padding: 20px;
    border-radius: 12px;
    background: #f7fafc;
    border: 2px solid #e2e8f0;
}

.feedback.hidden {
    display: none;
}

.feedback-icon {
    font-size: 3rem;
    margin-bottom: 10px;
    animation: feedbackBounce 0.8s ease-in-out;
}

.feedback-icon.correct {
    color: #48bb78;
}

.feedback-icon.incorrect {
    color: #f56565;
}

.feedback-text {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.feedback-text.correct {
    color: #2f855a;
}

.feedback-text.incorrect {
    color: #c53030;
}

.explanation {
    background: #edf2f7;
    padding: 15px;
    border-radius: 8px;
    margin-top: 15px;
    color: #4a5568;
    font-style: italic;
    line-height: 1.5;
}

.next-button {
    background: #667eea;
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 25px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.next-button:hover {
    background: #5a67d8;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.next-button.hidden {
    display: none;
}

/* Completion Message Styles */
.completion-message {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 40px;
    text-align: center;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
}

.completion-message.hidden {
    display: none;
}

.completion-message h2 {
    color: #48bb78;
    font-size: 2.5rem;
    margin-bottom: 20px;
    animation: celebrationBounce 1s ease-in-out;
}

.completion-message p {
    font-size: 1.1rem;
    color: #4a5568;
    margin-bottom: 10px;
}

.restart-button {
    background: #48bb78;
    color: white;
    border: none;
    padding: 15px 40px;
    border-radius: 25px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    margin-top: 20px;
    transition: all 0.3s ease;
}

.restart-button:hover {
    background: #38a169;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(72, 187, 120, 0.3);
}

/* Animations */
@keyframes correctPulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

@keyframes incorrectShake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

@keyframes feedbackBounce {
    0% { transform: scale(0.3); opacity: 0; }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); opacity: 1; }
}

@keyframes celebrationBounce {
    0% { transform: scale(0.5); opacity: 0; }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); opacity: 1; }
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .progress {
        flex-direction: column;
        gap: 10px;
    }
    
    .requirements {
        flex-direction: column;
        gap: 8px;
    }
    
    .quiz-container {
        padding: 20px;
    }
    
    .question-section h2 {
        font-size: 1.3rem;
    }
    
    .answer-button {
        padding: 12px 15px;
        font-size: 0.95rem;
    }
    
    .answer-container {
        padding: 12px 15px;
    }
    
    .answer-label {
        font-size: 0.95rem;
    }
    
    .test-question {
        padding: 15px;
    }
    
    .test-question h3 {
        font-size: 1.1rem;
    }
}

/* Test Selection Page Styles */
.subtitle {
    text-align: center;
    color: #718096;
    margin-top: 10px;
    font-size: 1.1rem;
}

.test-selection {
    margin-top: 20px;
}

.category-section {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 25px;
    margin-bottom: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
}

.category-title {
    color: #4a5568;
    font-size: 1.8rem;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 3px solid #667eea;
}

.test-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 15px;
}

.test-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px;
    border-radius: 12px;
    text-decoration: none;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
    gap: 10px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.test-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

.test-card h3 {
    margin: 0;
    font-size: 1.3rem;
    font-weight: 600;
}

.test-type {
    font-size: 0.9rem;
    padding: 6px 12px;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.2);
    display: inline-block;
    width: fit-content;
}

.test-type.test {
    background: rgba(255, 255, 255, 0.3);
}

.test-type.practice {
    background: rgba(255, 255, 255, 0.2);
}

@media (max-width: 768px) {
    .test-list {
        grid-template-columns: 1fr;
    }
    
    .category-title {
        font-size: 1.5rem;
    }
}