* {
    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;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    max-width: 600px;
    width: 100%;
    padding: 40px;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

h1 {
    color: #333;
    font-size: 2.5em;
    margin-bottom: 10px;
}

.subtitle {
    color: #666;
    font-size: 1.1em;
}

.stats {
    display: flex;
    justify-content: space-around;
    margin-bottom: 30px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 10px;
}

.stat {
    text-align: center;
}

.stat-label {
    display: block;
    color: #666;
    font-size: 0.9em;
    margin-bottom: 5px;
}

.stat-value {
    display: block;
    color: #667eea;
    font-size: 1.8em;
    font-weight: bold;
}

.quiz-content {
    margin-bottom: 30px;
}

.audio-section {
    text-align: center;
    margin-bottom: 40px;
}

.play-button {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    border-radius: 50%;
    width: 120px;
    height: 120px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.4);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 0 auto 15px;
}

.play-button:hover {
    transform: scale(1.05);
    box-shadow: 0 15px 40px rgba(102, 126, 234, 0.5);
}

.play-button:active {
    transform: scale(0.95);
}

.play-button span {
    color: white;
    font-size: 0.9em;
    margin-top: 5px;
}

.instruction {
    color: #666;
    font-size: 0.95em;
}

.options-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    margin-bottom: 20px;
}

.option-button {
    background: white;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    padding: 25px;
    font-size: 2em;
    cursor: pointer;
    transition: all 0.2s;
}

.option-button:hover {
    border-color: #667eea;
    background: #f8f9ff;
    transform: translateY(-2px);
}

.option-button.correct {
    background: #4caf50;
    color: white;
    border-color: #4caf50;
}

.option-button.incorrect {
    background: #f44336;
    color: white;
    border-color: #f44336;
}

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

.feedback {
    text-align: center;
    padding: 20px;
    border-radius: 10px;
    margin-top: 20px;
}

.feedback.correct-feedback {
    background: #e8f5e9;
    color: #2e7d32;
}

.feedback.incorrect-feedback {
    background: #ffebee;
    color: #c62828;
}

#feedback-text {
    font-size: 1.2em;
    margin-bottom: 15px;
    font-weight: 500;
}

.next-button {
    background: #667eea;
    color: white;
    border: none;
    border-radius: 8px;
    padding: 12px 30px;
    font-size: 1em;
    cursor: pointer;
    transition: background 0.2s;
}

.next-button:hover {
    background: #5568d3;
}

.results {
    text-align: center;
    padding: 30px;
}

.results h2 {
    color: #333;
    font-size: 2em;
    margin-bottom: 20px;
}

.final-score {
    font-size: 1.5em;
    color: #667eea;
    margin-bottom: 10px;
}

.percentage {
    font-size: 3em;
    font-weight: bold;
    color: #764ba2;
    margin: 20px 0;
}

.restart-button {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 10px;
    padding: 15px 40px;
    font-size: 1.1em;
    cursor: pointer;
    transition: transform 0.2s;
    margin-top: 20px;
}

.restart-button:hover {
    transform: scale(1.05);
}

footer {
    border-top: 1px solid #e0e0e0;
    padding-top: 20px;
}

.settings {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}

.settings label {
    color: #666;
    font-weight: 500;
}

#category-select,
#mode-select {
    padding: 8px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1em;
    cursor: pointer;
    background: white;
}

#category-select:focus,
#mode-select:focus {
    outline: none;
    border-color: #667eea;
}

/* Feature Analysis Mode Styles */
.feature-question-header {
    text-align: center;
    font-size: 1.3em;
    font-weight: 600;
    color: #333;
    margin-bottom: 20px;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 10px;
}

.feature-options-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
}

.feature-option {
    font-size: 1.1em !important;
    padding: 20px !important;
    text-align: center;
    white-space: normal;
    word-wrap: break-word;
}

.hidden {
    display: none !important;
}

@media (max-width: 600px) {
    .container {
        padding: 20px;
    }

    h1 {
        font-size: 2em;
    }

    .options-container {
        grid-template-columns: 1fr;
    }

    .feature-options-grid {
        grid-template-columns: 1fr;
    }

    .feature-question-header {
        font-size: 1.1em;
        padding: 12px;
    }
}

/* Complete Analysis Mode Styles */
.complete-analysis-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 10px;
}

.feature-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.feature-group:first-child {
    padding-bottom: 15px;
    border-bottom: 2px solid #ddd;
    margin-bottom: 5px;
}

.feature-group:first-child .feature-label {
    font-size: 1.2em;
    color: #667eea;
}

.feature-label {
    font-weight: 600;
    color: #333;
    font-size: 1.1em;
}

.feature-select-container {
    position: relative;
}

.feature-select {
    width: 100%;
    padding: 12px 16px;
    font-size: 1em;
    border: 2px solid #ddd;
    border-radius: 8px;
    background: white;
    cursor: pointer;
    transition: all 0.3s ease;
}

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

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

.feature-select:disabled {
    cursor: not-allowed;
    opacity: 0.7;
    background: #f0f0f0;
}

.feature-select-container.correct .feature-select {
    border-color: #4caf50;
    background: #e8f5e9;
}

.feature-select-container.incorrect .feature-select {
    border-color: #f44336;
    background: #ffebee;
}

.correct-answer-label {
    display: block;
    margin-top: 5px;
    color: #4caf50;
    font-size: 0.9em;
    font-weight: 500;
}

.submit-analysis-button {
    padding: 15px 30px;
    font-size: 1.1em;
    font-weight: 600;
    color: white;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 10px;
}

.submit-analysis-button:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
}

.submit-analysis-button:active:not(:disabled) {
    transform: translateY(0);
}

.submit-analysis-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}