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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #0f0f23 0%, #1a1a2e 50%, #16213e 100%);
    color: #ffffff;
    min-height: 100vh;
    padding: 20px;
    overflow-x: hidden;
    position: relative;
}

/* Add animated background elements */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at 20% 50%, rgba(102, 126, 234, 0.1) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 20%, rgba(118, 75, 162, 0.1) 0%, transparent 50%),
                radial-gradient(ellipse at 40% 80%, rgba(102, 126, 234, 0.05) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

.container {
    max-width: 900px;
    margin: 0 auto;
}

/* Input Section Styles */
.input-section {
    text-align: center;
    padding: 60px 20px;
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    animation: fadeInUp 0.8s ease-out;
}

.input-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at center, rgba(102, 126, 234, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.input-section h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    font-weight: 800;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: slideInFromLeft 1s ease-out;
}

.input-section p {
    font-size: 1.25rem;
    margin-bottom: 40px;
    color: #cccccc;
    animation: slideInFromLeft 1s ease-out 0.2s both;
}

#quiz-input {
    width: 100%;
    min-height: 450px;
    padding: 30px;
    background: rgba(40, 40, 40, 0.8);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    color: #ffffff;
    font-size: 15px;
    font-family: 'Inter', 'Consolas', 'Monaco', monospace;
    resize: vertical;
    margin-bottom: 30px;
    transition: all 0.3s ease;
    backdrop-filter: blur(20px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    animation: slideInFromLeft 1s ease-out 0.4s both;
}

#quiz-input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2), 0 15px 50px rgba(0, 0, 0, 0.3);
    background: rgba(50, 50, 50, 0.9);
}

#quiz-input::placeholder {
    color: #aaaaaa;
    line-height: 1.6;
}

/* Button Styles */
.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 25px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: transparent;
    color: #cccccc;
    border: 2px solid #666666;
    padding: 12px 24px;
    border-radius: 20px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 20px;
}

.btn-secondary:hover {
    border-color: #888888;
    color: #ffffff;
}

/* Quiz Section Styles */
.quiz-section {
    padding: 40px 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
}

.quiz-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at center, rgba(102, 126, 234, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.quiz-container {
    background: rgba(40, 40, 40, 0.8);
    border-radius: 25px;
    padding: 50px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(30px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    position: relative;
    overflow: hidden;
    animation: slideInFromBottom 0.8s ease-out;
    max-width: 1000px;
    margin: 0 auto;
}

.quiz-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

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

#question-number {
    font-size: 2rem;
    font-weight: 700;
    color: #ffffff;
    margin-right: 15px;
}

#question-text {
    font-size: 1.5rem;
    font-weight: 500;
    line-height: 1.4;
    color: #ffffff;
}

/* Options Styles */
.options-container {
    margin-bottom: 40px;
}

.option {
    background: rgba(60, 60, 60, 0.6);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 25px;
    margin-bottom: 20px;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(20px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.option::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s ease;
}

.option:hover {
    background: rgba(80, 80, 80, 0.8);
    border-color: rgba(102, 126, 234, 0.6);
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.2);
}

.option:hover::before {
    left: 100%;
}

.option.selected {
    background: rgba(102, 126, 234, 0.2);
    border-color: #667eea;
    box-shadow: 0 0 30px rgba(102, 126, 234, 0.3);
    transform: translateY(-2px);
}

.option.correct {
    background: rgba(76, 175, 80, 0.2);
    border-color: #4caf50;
    animation: correctPulse 0.6s ease-out;
    box-shadow: 0 0 30px rgba(76, 175, 80, 0.3);
}

.option.incorrect {
    background: rgba(244, 67, 54, 0.2);
    border-color: #f44336;
    animation: incorrectShake 0.6s ease-out;
    box-shadow: 0 0 30px rgba(244, 67, 54, 0.3);
}

.option-label {
    font-size: 1.2rem;
    font-weight: 700;
    margin-right: 20px;
    min-width: 30px;
    color: #ffffff;
}

.option-text {
    font-size: 1.1rem;
    line-height: 1.3;
    color: #ffffff;
}

/* Quiz Controls */
.quiz-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.question-counter {
    background: rgba(255, 255, 255, 0.1);
    color: #ffffff;
    padding: 12px 20px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.navigation-buttons {
    display: flex;
    gap: 15px;
    align-items: center;
}

.btn-next,
.btn-previous {
    background: #7c93f5;
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 25px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(124, 147, 245, 0.3);
}

.btn-next:hover,
.btn-previous:hover {
    background: #6a7ff2;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(124, 147, 245, 0.4);
}

.btn-previous {
    background: #6c757d;
    box-shadow: 0 4px 15px rgba(108, 117, 125, 0.3);
}

.btn-previous:hover {
    background: #5a6268;
    box-shadow: 0 6px 20px rgba(108, 117, 125, 0.4);
}

/* Feedback Section */
.feedback-section {
    margin-bottom: 30px;
    text-align: center;
}

.feedback-content {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    padding: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
}

.feedback-icon {
    font-size: 3rem;
    margin-bottom: 10px;
    font-weight: bold;
}

.feedback-text {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.correct-answer {
    font-size: 1rem;
    color: #cccccc;
    font-style: italic;
}

.feedback-content.correct {
    border-color: rgba(76, 175, 80, 0.5);
    background: rgba(76, 175, 80, 0.1);
}

.feedback-content.correct .feedback-icon {
    color: #4caf50;
}

.feedback-content.correct .feedback-text {
    color: #4caf50;
}

.feedback-content.incorrect {
    border-color: rgba(244, 67, 54, 0.5);
    background: rgba(244, 67, 54, 0.1);
}

.feedback-content.incorrect .feedback-icon {
    color: #f44336;
}

.feedback-content.incorrect .feedback-text {
    color: #f44336;
}

/* Explanation Section */
.explanation-section {
    margin-bottom: 30px;
    text-align: left;
}

.explanation-content {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    border: 1px solid rgba(102, 126, 234, 0.3);
    border-radius: 15px;
    padding: 25px;
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.explanation-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.explanation-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: #667eea;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.explanation-text {
    font-size: 1.1rem;
    line-height: 1.6;
    color: #e0e0e0;
    font-weight: 400;
}

.explanation-text strong {
    color: #ffffff;
    font-weight: 600;
}

/* Animation for explanation */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
        max-height: 0;
    }
    to {
        opacity: 1;
        transform: translateY(0);
        max-height: 200px;
    }
}

.explanation-section:not(.hidden) {
    animation: slideDown 0.5s ease-out;
}

/* Navigation Dots */
.navigation-dots {
    text-align: center;
}

.dots-container {
    display: flex;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
    max-height: 200px;
    overflow-y: auto;
    padding: 10px;
}

.dot {
    min-width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
    color: #ffffff;
    border: 2px solid transparent;
    position: relative;
}

.dot.active {
    background: #667eea;
    transform: scale(1.2);
    border-color: rgba(102, 126, 234, 0.6);
    box-shadow: 0 0 20px rgba(102, 126, 234, 0.4);
    color: #ffffff;
    font-weight: 700;
}

.dot.completed {
    background: #4caf50;
    color: #ffffff;
    border-color: rgba(76, 175, 80, 0.6);
}

.dot.correct {
    background: #4caf50;
    color: #ffffff;
    border-color: rgba(76, 175, 80, 0.6);
    box-shadow: 0 0 15px rgba(76, 175, 80, 0.4);
}

.dot.incorrect {
    background: #f44336;
    color: #ffffff;
    border-color: rgba(244, 67, 54, 0.6);
    box-shadow: 0 0 15px rgba(244, 67, 54, 0.4);
}

/* Results Section Styles */
.results-section {
    padding: 60px 20px;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.results-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at center, rgba(102, 126, 234, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.results-container {
    background: linear-gradient(145deg, rgba(40, 40, 60, 0.9), rgba(30, 30, 50, 0.8));
    border-radius: 30px;
    padding: 60px;
    box-shadow: 
        0 25px 80px rgba(0, 0, 0, 0.5),
        0 0 50px rgba(102, 126, 234, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(40px);
    border: 1px solid rgba(102, 126, 234, 0.3);
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    overflow: hidden;
    animation: slideInFromBottom 0.8s ease-out;
}

.results-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.results-header {
    margin-bottom: 50px;
    animation: fadeInUp 0.8s ease-out;
}

.results-header h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    font-weight: 800;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: slideInFromLeft 1s ease-out;
}

.time-display {
    text-align: center;
    margin-bottom: 20px;
    font-size: 1.3rem;
    color: #e0e0e0;
    animation: fadeInUp 0.8s ease-out 0.3s both;
}

.time-label {
    color: #cccccc;
    font-weight: 500;
}

.time-value {
    font-weight: 700;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-left: 5px;
}

.score-display {
    margin-bottom: 30px;
}

.score-circle {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    box-shadow: 0 20px 50px rgba(102, 126, 234, 0.4);
    animation: scoreAnimation 1.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.score-circle::before {
    content: '';
    position: absolute;
    top: -10px;
    left: -10px;
    right: -10px;
    bottom: -10px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    opacity: 0.3;
    animation: pulse 2s infinite;
    z-index: -1;
}

.score-circle #score-percentage {
    font-size: 2.5rem;
    font-weight: 800;
    color: white;
    line-height: 1;
}

.score-label {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.9);
    margin-top: 8px;
    font-weight: 500;
}

/* New Results Cards Layout */
.results-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 3rem;
}

.results-card {
    background: rgba(40, 40, 40, 0.8);
    border-radius: 25px;
    padding: 2.5rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(30px);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    text-align: center;
    position: relative;
    overflow: hidden;
    animation: slideInFromBottom 0.6s ease-out;
}

.results-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(102, 126, 234, 0.1), transparent);
    transition: left 0.5s ease;
}

.results-card:hover {
    transform: translateY(-8px) scale(1.02);
    border-color: rgba(102, 126, 234, 0.3);
    box-shadow: 0 20px 50px rgba(102, 126, 234, 0.2);
}

.results-card:hover::before {
    left: 100%;
}

.card-label {
    font-size: 1.1rem;
    color: #cccccc;
    font-weight: 500;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.card-value {
    font-size: 3.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

/* Stats Grid inside the third card */
.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1.2rem;
}

.stats-card .stat-item {
    background: rgba(60, 60, 80, 0.4);
    border-radius: 15px;
    padding: 1.8rem 0.8rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    transition: all 0.3s ease;
    text-align: center;
    position: relative;
    overflow: visible;
    min-width: 85px;
    min-height: 100px;
}

.stats-card .stat-item:hover {
    background: rgba(80, 80, 100, 0.6);
    transform: translateY(-3px);
    border-color: rgba(102, 126, 234, 0.3);
}

.stat-label {
    font-size: 0.75rem;
    color: #aaaaaa;
    font-weight: 500;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.3px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.stat-value {
    font-size: 2rem;
    font-weight: 800;
    line-height: 1;
}

.correct-stat {
    color: #4caf50;
}

.incorrect-stat {
    color: #f44336;
}

.unanswered-stat {
    color: #9e9e9e;
}

.time-stat {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Confetti Styles */
#confetti-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: 9999;
    overflow: hidden;
}

.confetti {
    position: absolute;
    width: 10px;
    height: 10px;
    background: #667eea;
    animation: confetti-fall linear infinite;
}

.confetti:nth-child(odd) {
    background: #4caf50;
    border-radius: 50%;
}

.confetti:nth-child(even) {
    background: #ff6b6b;
}

.confetti:nth-child(3n) {
    background: #feca57;
    border-radius: 50%;
}

.confetti:nth-child(4n) {
    background: #48dbfb;
}

.confetti:nth-child(5n) {
    background: #ff9ff3;
    border-radius: 50%;
}

@keyframes confetti-fall {
    from {
        transform: translateY(-100vh) rotate(0deg);
        opacity: 1;
    }
    to {
        transform: translateY(100vh) rotate(720deg);
        opacity: 0;
    }
}

/* Perfect Score Animation */
.perfect-score {
    animation: perfectScoreGlow 2s ease-in-out infinite alternate;
    border-color: rgba(76, 175, 80, 0.5) !important;
}

@keyframes perfectScoreGlow {
    from {
        box-shadow: 0 20px 50px rgba(102, 126, 234, 0.2), 0 0 20px rgba(76, 175, 80, 0.3);
        border-color: rgba(76, 175, 80, 0.5);
    }
    to {
        box-shadow: 0 20px 50px rgba(102, 126, 234, 0.2), 0 0 40px rgba(76, 175, 80, 0.6);
        border-color: rgba(76, 175, 80, 0.8);
    }
}

.results-actions {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.results-actions .btn-primary,
.results-actions .btn-secondary {
    margin-top: 0;
    min-width: 180px;
}

/* Enhanced Animations */
@keyframes scoreAnimation {
    from {
        transform: scale(0);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

@keyframes slideInFromBottom {
    from {
        transform: translateY(50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.results-container {
    animation: slideInFromBottom 0.6s ease-out;
}

.stat-item {
    animation: slideInFromBottom 0.6s ease-out;
}

.stat-item:nth-child(1) { animation-delay: 0.1s; }
.stat-item:nth-child(2) { animation-delay: 0.2s; }
.stat-item:nth-child(3) { animation-delay: 0.3s; }

/* Utility Classes */
.hidden {
    display: none;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .quiz-container {
        padding: 20px;
    }
    
    #question-number {
        font-size: 1.5rem;
    }
    
    #question-text {
        font-size: 1.2rem;
    }
    
    .option {
        padding: 15px;
    }
    
    .option-label {
        font-size: 1rem;
        margin-right: 15px;
        min-width: 25px;
    }
    
    .option-text {
        font-size: 1rem;
    }
    
    .quiz-controls {
        flex-direction: column;
        gap: 15px;
    }
    
    .btn-hint, .btn-next {
        width: 100%;
        justify-content: center;
    }
    
    .results-cards {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .results-card {
        padding: 2rem;
    }
    
    .card-value {
        font-size: 2.5rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .stat-value {
        font-size: 1.5rem;
    }
    
    .results-container {
        padding: 20px;
    }
    
    .results-header h1 {
        font-size: 2rem;
    }
    
    .score-circle {
        width: 100px;
        height: 100px;
    }
    
    .score-circle #score-percentage {
        font-size: 1.5rem;
    }
    
    #results-chart {
        max-width: 250px;
        height: 250px !important;
    }
    
    .chart-legend {
        align-items: center;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .results-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .results-actions .btn-primary,
    .results-actions .btn-secondary {
        width: 100%;
        max-width: 300px;
    }
    
    /* Mobile responsive navigation dots */
    .dot {
        min-width: 28px;
        height: 28px;
        font-size: 11px;
    }
    
    .dots-container {
        gap: 6px;
        max-height: 150px;
    }
}

/* All Animation Keyframes */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInFromLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInFromRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes correctPulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); box-shadow: 0 0 40px rgba(76, 175, 80, 0.6); }
    100% { transform: scale(1); }
}

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

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.quiz-container {
    animation: fadeIn 0.5s ease-out;
}

.option {
    animation: fadeIn 0.5s ease-out;
}

.option:nth-child(1) { animation-delay: 0.1s; }
.option:nth-child(2) { animation-delay: 0.2s; }
.option:nth-child(3) { animation-delay: 0.3s; }
.option:nth-child(4) { animation-delay: 0.4s; }