/* Modern Quiz App Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --error-gradient: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    --shadow-light: 0 8px 32px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 20px 60px rgba(0, 0, 0, 0.15);
    --shadow-heavy: 0 30px 80px rgba(0, 0, 0, 0.2);
    --border-radius: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--primary-gradient);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    line-height: 1.6;
    position: relative;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(120, 219, 255, 0.2) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

.quiz-container {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-heavy);
    max-width: 800px;
    width: 100%;
    padding: 50px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.quiz-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-gradient);
    border-radius: var(--border-radius) var(--border-radius) 0 0;
}

.quiz-container:hover {
    transform: translateY(-5px);
    box-shadow: 0 40px 100px rgba(0, 0, 0, 0.25);
}

.quiz-header {
    text-align: center;
    margin-bottom: 40px;
    position: relative;
}

.quiz-title {
    color: #1a1a1a;
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 15px;
    letter-spacing: -0.02em;
    position: relative;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol', sans-serif;
}

.quiz-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--primary-gradient);
    border-radius: 2px;
}

.progress-container {
    margin: 30px 0;
    position: relative;
}

.progress-bar {
    background: rgba(0, 0, 0, 0.08);
    border-radius: 20px;
    height: 12px;
    overflow: hidden;
    position: relative;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.progress-fill {
    background: var(--primary-gradient);
    height: 100%;
    border-radius: 20px;
    transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    width: 0%;
    position: relative;
    overflow: hidden;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}

.topic-badge {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 20px;
    color: white;
    background: var(--secondary-gradient);
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.topic-badge::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.topic-badge:hover::before {
    left: 100%;
}

.question-counter {
    text-align: center;
    color: #666;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 25px;
    padding: 8px 16px;
    background: rgba(0, 0, 0, 0.05);
    border-radius: 20px;
    display: inline-block;
    margin-left: 50%;
    transform: translateX(-50%);
}

.question {
    color: #1a1a1a;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 30px;
    line-height: 1.5;
    text-align: center;
    padding: 0 20px;
}

.options {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 30px;
}

/* Enhanced option styling with better visual indicators */
.option {
    background: rgba(255, 255, 255, 0.8);
    border: 2px solid transparent;
    border-radius: 16px;
    padding: 20px 24px;
    cursor: pointer;
    transition: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    font-weight: 500;
    font-size: 1rem;
    line-height: 1.4;
    box-shadow: var(--shadow-light);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    gap: 12px;
}

.option::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-gradient);
    opacity: 0;
    transition: opacity 0.3s;
    z-index: -1;
}

.option::after {
    content: '';
    font-size: 1.2rem;
    font-weight: bold;
    min-width: 20px;
    text-align: center;
}

.option:hover:not(.disabled) {
    transform: translateX(8px) translateY(-2px);
    box-shadow: var(--shadow-medium);
    border-color: transparent;
}

.option:hover:not(.disabled)::before {
    opacity: 0.05;
}

.option.selected {
    border-color: #667eea;
    background: rgba(102, 126, 234, 0.1);
    transform: translateX(8px) scale(1.02);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
    transition: all 0.1s cubic-bezier(0.4, 0, 0.2, 1);
}

.option.correct {
    border-color: #10b981;
    background: rgba(16, 185, 129, 0.15);
    animation: correctPulse 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 8px 25px rgba(16, 185, 129, 0.3);
    transition: all 0.1s cubic-bezier(0.4, 0, 0.2, 1);
}

.option.correct::after {
    content: '✓';
    color: #10b981;
}

.option.incorrect {
    border-color: #ef4444;
    background: rgba(239, 68, 68, 0.15);
    animation: shake 0.3s cubic-bezier(0.36, 0.07, 0.19, 0.97);
    box-shadow: 0 8px 25px rgba(239, 68, 68, 0.3);
    transition: all 0.1s cubic-bezier(0.4, 0, 0.2, 1);
}

.option.incorrect::after {
    content: '✗';
    color: #ef4444;
}

.option.disabled {
    cursor: not-allowed;
    opacity: 0.6;
    transform: none;
}

.option.clicked {
    transform: scale(0.98) translateX(4px);
    transition: all 0.05s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes correctPulse {
    0%, 100% { 
        transform: scale(1) translateX(8px); 
    }
    50% { 
        transform: scale(1.02) translateX(8px); 
    }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-8px); }
    75% { transform: translateX(8px); }
}

.feedback {
    margin: 25px 0;
    padding: 20px;
    border-radius: 16px;
    text-align: center;
    font-weight: 600;
    display: none;
    font-size: 1.1rem;
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    animation: slideIn 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.feedback.show {
    display: block;
}

.feedback.correct {
    background: rgba(16, 185, 129, 0.1);
    color: #065f46;
    border-color: rgba(16, 185, 129, 0.3);
}

.feedback.incorrect {
    background: rgba(239, 68, 68, 0.1);
    color: #991b1b;
    border-color: rgba(239, 68, 68, 0.3);
}

.next-button {
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: 16px;
    padding: 18px 36px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    display: none;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-light);
    flex: 2;
    min-width: 200px;
}

.next-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.next-button:hover::before {
    left: 100%;
}

.next-button.show {
    display: block;
    animation: slideIn 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.next-button:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

.next-button:active {
    transform: translateY(-1px);
}

/* Quiz Actions Container */
.quiz-actions {
    display: flex;
    gap: 15px;
    margin-top: 30px;
    flex-wrap: wrap;
}

/* Finish Button Styles */
.finish-button {
    background: var(--error-gradient);
    color: white;
    border: none;
    border-radius: 16px;
    padding: 18px 36px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    display: none;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-light);
    flex: 1;
    min-width: 200px;
}

.finish-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.finish-button:hover::before {
    left: 100%;
}

.finish-button.show {
    display: block;
    animation: slideIn 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.finish-button:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

.finish-button:active {
    transform: translateY(-1px);
}

/* Responsive adjustments for quiz actions */
@media (max-width: 768px) {
    .quiz-actions {
        flex-direction: column;
        gap: 12px;
    }
    
    .next-button,
    .finish-button {
        width: 100%;
        min-width: unset;
    }
}

.results {
    text-align: center;
    display: none;
    animation: fadeIn 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.results.show {
    display: block;
}

.results h2 {
    color: #1a1a1a;
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 30px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.score {
    font-size: 4rem;
    font-weight: 900;
    background: var(--success-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin: 30px 0;
    background-clip: text;
    animation: scoreReveal 1s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes scoreReveal {
    from {
        opacity: 0;
        transform: scale(0.5) rotate(-10deg);
    }
    to {
        opacity: 1;
        transform: scale(1) rotate(0deg);
    }
}

#scoreMessage {
    font-size: 1.25rem;
    color: #666;
    margin-bottom: 40px;
    font-weight: 600;
    padding: 16px 32px;
    background: rgba(0, 0, 0, 0.05);
    border-radius: 20px;
    display: inline-block;
}

.restart-button {
    background: var(--secondary-gradient);
    color: white;
    border: none;
    border-radius: 16px;
    padding: 18px 36px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-light);
}

.restart-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.restart-button:hover::before {
    left: 100%;
}

.restart-button:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

.restart-button:active {
    transform: translateY(-1px);
}

/* Welcome Screen Styles */
.welcome-screen {
    text-align: center;
    padding: 40px 20px;
    animation: welcomeFadeIn 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.welcome-screen h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: #1a1a1a;
    font-weight: 800;
    letter-spacing: -0.02em;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol', sans-serif;
}

.welcome-screen p {
    font-size: 1.2rem;
    color: #666;
    margin-bottom: 30px;
    line-height: 1.6;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.welcome-screen .topics-container {
    background: rgba(0, 0, 0, 0.05);
    padding: 20px;
    border-radius: 16px;
    margin: 20px 0;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.welcome-screen .topics-container h3 {
    color: #333;
    margin-bottom: 15px;
    font-weight: 700;
    font-size: 1.1rem;
}

.welcome-screen .topics-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
}

.welcome-screen .topic-tag {
    background: var(--secondary-gradient);
    color: white;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    transition: var(--transition);
    cursor: default;
}

.welcome-screen .topic-tag:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-light);
}

#startQuizBtn {
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: 16px;
    padding: 18px 36px;
    font-size: 1.2rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-light);
    position: relative;
    overflow: hidden;
}

#startQuizBtn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

#startQuizBtn:hover::before {
    left: 100%;
}

#startQuizBtn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

#startQuizBtn:active {
    transform: translateY(-1px);
}

/* Incorrect Questions Section */
.incorrect-questions {
    margin: 30px 0;
    padding: 25px;
    background: rgba(239, 68, 68, 0.05);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: 16px;
    text-align: left;
}

.incorrect-answers-header {
    text-align: center;
    margin-bottom: 25px;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(239, 68, 68, 0.1);
}

.incorrect-answers-header h3 {
    color: #991b1b;
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.incorrect-count {
    color: #666;
    font-size: 0.9rem;
    font-weight: 600;
    background: rgba(0, 0, 0, 0.05);
    padding: 6px 12px;
    border-radius: 20px;
    display: inline-block;
}

.learning-tip {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    color: white;
    padding: 12px 20px;
    border-radius: 12px;
    font-weight: 600;
    text-align: center;
    margin-bottom: 20px;
    font-size: 0.95rem;
    box-shadow: 0 4px 12px rgba(79, 172, 254, 0.3);
}

.topic-summary {
    background: rgba(0, 0, 0, 0.03);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 25px;
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.topic-summary h4 {
    color: #333;
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 15px;
    text-align: center;
}

.topic-summary-grid {
    display: grid;
    gap: 10px;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.topic-summary-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 15px;
    background: white;
    border-radius: 8px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.topic-name {
    color: #333;
    font-weight: 600;
    font-size: 0.9rem;
}

.mistake-count {
    color: #dc2626;
    font-weight: 700;
    font-size: 0.85rem;
    background: rgba(239, 68, 68, 0.1);
    padding: 4px 8px;
    border-radius: 12px;
}

.incorrect-question {
    background: white;
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 16px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.incorrect-question .question-text {
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 15px;
    font-size: 1rem;
    line-height: 1.4;
}

.answer-comparison {
    margin-top: 15px;
}

.your-answer,
.correct-answer {
    display: flex;
    flex-direction: column;
    margin-bottom: 12px;
    padding: 12px;
    border-radius: 8px;
    border-left: 4px solid;
}

.your-answer {
    background: rgba(239, 68, 68, 0.05);
    border-left-color: #ef4444;
}

.correct-answer {
    background: rgba(16, 185, 129, 0.05);
    border-left-color: #10b981;
}

.answer-label {
    font-weight: 700;
    font-size: 0.85rem;
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.your-answer .answer-label {
    color: #dc2626;
}

.correct-answer .answer-label {
    color: #059669;
}

.answer-text {
    color: #1a1a1a;
    font-weight: 600;
    line-height: 1.4;
}

.incorrect-question .question-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    flex-wrap: wrap;
    gap: 8px;
}

.incorrect-question .topic-tag {
    display: inline-block;
    background: var(--secondary-gradient);
    color: white;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.incorrect-question .question-number {
    background: rgba(102, 126, 234, 0.1);
    color: #667eea;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    border: 1px solid rgba(102, 126, 234, 0.3);
}

/* Responsive Design */
@media (max-width: 768px) {
    .quiz-container {
        padding: 30px 20px;
        margin: 10px;
    }
    
    .quiz-title {
        font-size: 2rem;
    }
    
    .question {
        font-size: 1.25rem;
        padding: 0 10px;
    }
    
    .option {
        padding: 16px 20px;
        font-size: 0.95rem;
    }
    
    .score {
        font-size: 3rem;
    }
    
    .results h2 {
        font-size: 2rem;
    }
    
    .welcome-screen h2 {
        font-size: 2rem;
    }
    
    .welcome-screen p {
        font-size: 1.1rem;
    }
}

@media (max-width: 480px) {
    body {
        padding: 10px;
    }
    
    .quiz-container {
        padding: 25px 15px;
    }
    
    .quiz-title {
        font-size: 1.75rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 14px 16px;
        font-size: 0.9rem;
    }
    
    .welcome-screen h2 {
        font-size: 1.75rem;
    }
    
    .welcome-screen p {
        font-size: 1rem;
    }
    
    #startQuizBtn {
        padding: 16px 28px;
        font-size: 1.1rem;
    }
}

/* Loading Animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Focus states for accessibility */
.option:focus,
.next-button:focus,
.finish-button:focus,
.restart-button:focus,
#startQuizBtn:focus {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.1);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--primary-gradient);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-gradient);
}

/* Enhanced animations for better performance */
.quiz-container,
.option,
.next-button,
.restart-button,
#startQuizBtn {
    will-change: transform;
}

/* Smooth transitions for all interactive elements */
* {
    transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

/* Emoji Support */
.quiz-title,
.welcome-screen h2 {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* Ensure emojis are visible */
.quiz-title,
.welcome-screen h2 {
    color: #1a1a1a !important;
    background: none !important;
    -webkit-background-clip: unset !important;
    -webkit-text-fill-color: unset !important;
    background-clip: unset !important;
}

/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10000;
    animation: modalFadeIn 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes modalFadeIn {
    from {
        opacity: 0;
        backdrop-filter: blur(0px);
    }
    to {
        opacity: 1;
        backdrop-filter: blur(8px);
    }
}

.modal-content {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-heavy);
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    animation: modalSlideIn 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes modalSlideIn {
    from {
        transform: scale(0.9) translateY(-20px);
        opacity: 0;
    }
    to {
        transform: scale(1) translateY(0);
        opacity: 1;
    }
}

.modal-header {
    padding: 30px 30px 20px 30px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    text-align: center;
}

.modal-header h3 {
    color: #1a1a1a;
    font-size: 1.5rem;
    font-weight: 800;
    margin: 0;
    letter-spacing: -0.02em;
}

.modal-body {
    padding: 30px;
}

.current-status {
    margin-bottom: 25px;
}

.current-status h4 {
    color: #333;
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 15px;
}

.status-grid {
    display: grid;
    gap: 12px;
}

.status-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: rgba(0, 0, 0, 0.05);
    border-radius: 12px;
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.status-label {
    color: #666;
    font-weight: 600;
    font-size: 0.9rem;
}

.status-value {
    color: #1a1a1a;
    font-weight: 700;
    font-size: 1rem;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.what-happens {
    margin-bottom: 25px;
}

.what-happens h4 {
    color: #333;
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 15px;
}

.what-happens ul {
    margin: 0;
    padding-left: 20px;
    color: #666;
}

.what-happens li {
    margin-bottom: 8px;
    line-height: 1.5;
}

.confirmation-question {
    font-size: 1.1rem;
    font-weight: 600;
    color: #333;
    text-align: center;
    margin: 0;
    padding: 20px 0 10px 0;
}

.modal-footer {
    padding: 20px 30px 30px 30px;
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.modal-button {
    flex: 1;
    min-width: 140px;
    padding: 16px 24px;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.cancel-button {
    background: rgba(0, 0, 0, 0.1);
    color: #666;
    border: 2px solid rgba(0, 0, 0, 0.2);
}

.cancel-button:hover {
    background: rgba(0, 0, 0, 0.15);
    color: #333;
    transform: translateY(-2px);
    box-shadow: var(--shadow-light);
}

.confirm-button {
    background: var(--error-gradient);
    color: white;
    box-shadow: var(--shadow-light);
}

.confirm-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.confirm-button:hover::before {
    left: 100%;
}

.confirm-button:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

.modal-button:active {
    transform: translateY(-1px);
}

/* Responsive Modal */
@media (max-width: 768px) {
    .modal-content {
        width: 95%;
        margin: 10px;
    }
    
    .modal-header {
        padding: 25px 20px 15px 20px;
    }
    
    .modal-header h3 {
        font-size: 1.3rem;
    }
    
    .modal-body {
        padding: 20px;
    }
    
    .modal-footer {
        padding: 15px 20px 25px 20px;
        flex-direction: column;
    }
    
    .modal-button {
        width: 100%;
        min-width: unset;
    }
}

/* Enhanced progress indicator */
.question-counter {
    text-align: center;
    color: #1a1a1a;
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 25px;
    padding: 12px 24px;
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
    border-radius: 25px;
    display: inline-block;
    margin-left: 50%;
    transform: translateX(-50%);
    box-shadow: var(--shadow-light);
    letter-spacing: 0.5px;
}

/* Enhanced progress bar */
.progress-bar {
    background: rgba(0, 0, 0, 0.08);
    border-radius: 20px;
    height: 16px;
    overflow: hidden;
    position: relative;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
    margin-bottom: 15px;
}

.progress-fill {
    background: var(--primary-gradient);
    height: 100%;
    border-radius: 20px;
    transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    width: 0%;
    position: relative;
    overflow: hidden;
}

.progress-text {
    text-align: center;
    font-size: 0.9rem;
    font-weight: 600;
    color: #666;
    margin-bottom: 10px;
}

/* Navigation buttons styling */
.quiz-navigation {
    display: flex;
    gap: 15px;
    margin-top: 30px;
    flex-wrap: wrap;
    justify-content: center;
}

.nav-button {
    background: var(--secondary-gradient);
    color: white;
    border: none;
    border-radius: 12px;
    padding: 12px 20px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-light);
    min-width: 120px;
}

.nav-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.nav-button:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

/* Topic selection styles */
.topic-selection {
    margin: 30px 0;
    padding: 25px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.topic-selection h3 {
    text-align: center;
    color: #1a1a1a;
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.topic-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

.topic-item {
    background: rgba(255, 255, 255, 0.9);
    border: 2px solid transparent;
    border-radius: 12px;
    padding: 15px;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.topic-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-light);
    border-color: #667eea;
}

.topic-item.selected {
    border-color: #667eea;
    background: rgba(102, 126, 234, 0.1);
    transform: scale(1.02);
}

.topic-item h4 {
    font-size: 1rem;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 8px;
}

.topic-item .question-count {
    font-size: 0.85rem;
    color: #666;
    font-weight: 500;
}

/* Dark mode styles */
@media (prefers-color-scheme: dark) {
    :root {
        --glass-bg: rgba(0, 0, 0, 0.3);
        --glass-border: rgba(255, 255, 255, 0.1);
    }
    
    body {
        background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    }
    
    .quiz-container {
        background: rgba(0, 0, 0, 0.8);
        border-color: rgba(255, 255, 255, 0.1);
    }
    
    .quiz-title,
    .question,
    .modal-header h3 {
        color: #ffffff;
    }
    
    .option {
        background: rgba(255, 255, 255, 0.1);
        color: #ffffff;
        border-color: rgba(255, 255, 255, 0.2);
    }
    
    .option:hover:not(.disabled) {
        background: rgba(255, 255, 255, 0.15);
    }
}

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    .option.correct {
        border-color: #000000;
        background: #90EE90;
        color: #000000;
    }
    
    .option.incorrect {
        border-color: #000000;
        background: #FFB6C1;
        color: #000000;
    }
}

/* Keyboard navigation focus styles */
.option:focus-visible {
    outline: 3px solid #667eea;
    outline-offset: 2px;
}

.nav-button:focus-visible,
.next-button:focus-visible,
.finish-button:focus-visible {
    outline: 3px solid #667eea;
    outline-offset: 2px;
}

/* Auto-scroll target for keeping controls visible */
.quiz-actions {
    scroll-margin-top: 20px;
}

/* Timer/countdown styles */
.timer-container {
    text-align: center;
    margin-bottom: 20px;
}

.timer {
    display: inline-block;
    padding: 12px 24px;
    background: linear-gradient(135deg, #ff9a9e 0%, #fecfef 100%);
    color: white;
    border-radius: 25px;
    font-weight: 700;
    font-size: 1.1rem;
    box-shadow: var(--shadow-light);
    letter-spacing: 0.5px;
}

.timer.warning {
    background: var(--error-gradient);
    animation: timerPulse 1s infinite;
}

@keyframes timerPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

/* Summary page styles */
.quiz-summary {
    margin-top: 30px;
    padding: 25px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.summary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

.summary-item {
    text-align: center;
    padding: 15px;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 12px;
    box-shadow: var(--shadow-light);
}

.summary-item .label {
    font-size: 0.9rem;
    color: #666;
    font-weight: 600;
    margin-bottom: 5px;
}

.summary-item .value {
    font-size: 1.5rem;
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Responsive improvements */
@media (max-width: 768px) {
    .quiz-navigation {
        flex-direction: column;
        gap: 10px;
    }
    
    .nav-button {
        width: 100%;
        min-width: unset;
    }
    
    .topic-grid {
        grid-template-columns: 1fr;
    }
    
    .summary-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .summary-grid {
        grid-template-columns: 1fr;
    }
    
    .question-counter {
        font-size: 1rem;
        padding: 10px 20px;
    }
    
    .timer {
        font-size: 1rem;
        padding: 10px 20px;
    }
}