.quiz-selection-header {
    text-align: center;
    margin-bottom: 3rem;
}

.quiz-selection-header h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--light), #E2E8F0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.quiz-selection-header p {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.8);
    max-width: 600px;
    margin: 0 auto;
}

.quiz-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.quiz-card {
    background: var(--glass-bg);
    backdrop-filter: blur(15px);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--glass-shadow);
    transition: all 0.4s ease;
    cursor: pointer;
    border: 1px solid var(--glass-border);
    position: relative;
    height: 380px;
    display: flex;
    flex-direction: column;
}

.quiz-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.3);
}

.quiz-glow {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary), transparent);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 1;
}

.quiz-card:hover .quiz-glow {
    opacity: 0.1;
}

.quiz-image {
    flex: 1;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.quiz-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.quiz-card:hover .quiz-image img {
    transform: scale(1.05);
}

.quiz-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0) 50%);
    z-index: 1;
}

.quiz-badge {
    position: absolute;
    top: 1rem;
    left: 1rem;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    z-index: 2;
}

.quiz-content {
    padding: 1.5rem;
    color: white;
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
    z-index: 2;
}

.quiz-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 0.8rem;
    color: white;
}

.quiz-content p {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 1rem;
    line-height: 1.5;
}

.quiz-meta {
    display: flex;
    justify-content: space-between;
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
}

.quiz-container {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-radius: 24px;
    padding: 2.5rem;
    box-shadow: var(--glass-shadow);
    border: 1px solid var(--glass-border);
    position: relative;
    overflow: hidden;
}

.quiz-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
}

.screen {
    display: none;
}

.screen.active {
    display: block;
    animation: fadeInUp 0.6s ease-out;
}

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

.quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2.5rem;
    padding: 1.5rem;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border-radius: 16px;
    box-shadow: 0 8px 25px rgba(108, 99, 255, 0.3);
    gap: 2rem;
}

.quiz-progress-section {
    flex: 1;
}

.quiz-progress {
    min-width: 200px;
}

.progress-bar {
    width: 100%;
    height: 10px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 5px;
    overflow: hidden;
    margin-bottom: 0.8rem;
}

.progress-fill {
    height: 100%;
    background: white;
    width: 0%;
    transition: width 0.4s ease;
    border-radius: 5px;
    box-shadow: 0 2px 10px rgba(255, 255, 255, 0.3);
}

.quiz-controls {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.sound-toggle {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 12px;
    padding: 0.8rem 1.2rem;
    cursor: pointer;
    transition: all 0.3s ease;
    color: white;
    font-size: 1rem;
    font-weight: 500;
    min-width: 120px;
    justify-content: center;
}

.sound-toggle:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-2px);
}

.sound-toggle.muted {
    opacity: 0.7;
    background: rgba(255, 255, 255, 0.1);
}

.sound-text {
    font-size: 0.9rem;
    font-weight: 600;
}

.quiz-timer {
    font-size: 1.3rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    background: rgba(255, 255, 255, 0.2);
    padding: 0.8rem 1.2rem;
    border-radius: 12px;
    backdrop-filter: blur(10px);
    white-space: nowrap;
}

.timer-icon {
    animation: pulse 1s infinite;
}

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

.question-container {
    background: rgba(255, 255, 255, 0.05);
    padding: 2rem;
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
    border: 1px solid var(--glass-border);
    min-height: 500px;
}

.question-content {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
    height: 100%;
}

.question-image {
    flex: 0 0 400px;
    height: 500px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    border-radius: 12px;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    font-size: 3rem;
    color: white;
    box-shadow: 0 6px 20px rgba(108, 99, 255, 0.2);
    overflow: hidden;
    position: relative;
}

.question-image-content {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top center;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.05);
}

.question-text-section {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.question-text {
    color: white;
    margin-bottom: 2rem;
    font-size: 1.3rem;
    line-height: 1.5;
    font-weight: 600;
    flex-shrink: 0;
}

.answers-container {
    display: grid;
    gap: 1rem;
    flex: 1;
}

.answer-btn {
    padding: 1.2rem 1.5rem;
    border: 2px solid var(--glass-border);
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.05);
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: left;
    font-size: 1rem;
    font-weight: 500;
    color: white;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    position: relative;
    overflow: hidden;
}

.answer-btn::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;
}

.answer-btn:hover::before {
    left: 100%;
}

.answer-btn:hover {
    border-color: var(--primary);
    background: rgba(108, 99, 255, 0.1);
    transform: translateX(5px);
    box-shadow: 0 6px 20px rgba(108, 99, 255, 0.2);
}

.answer-btn.correct {
    border: 2px solid var(--success);
    background: rgba(16, 185, 129, 0.15);
    color: var(--success);
    transform: translateX(5px);
    box-shadow: 0 0 20px rgba(16, 185, 129, 0.3);
    backdrop-filter: blur(10px);
}

.answer-btn.correct .answer-text {
    font-weight: 600;
    text-shadow: 0 0 10px rgba(16, 185, 129, 0.5);
}

.answer-btn.incorrect {
    border-color: var(--error);
    background: rgba(239, 68, 68, 0.1);
    color: var(--error);
    transform: translateX(5px);
}

.answer-btn.disabled {
    cursor: not-allowed;
    opacity: 0.7;
    transform: none !important;
}

.answer-btn.disabled::before {
    display: none;
}

.quiz-feedback {
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-radius: 14px;
    text-align: center;
    font-weight: 600;
    display: none;
    font-size: 1.2rem;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.quiz-feedback.correct {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
    display: block;
    border: 2px solid var(--success);
}

.quiz-feedback.incorrect {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error);
    display: block;
    border: 2px solid var(--error);
}

.answer-explanation {
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-radius: 14px;
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
    display: none;
    border-left: 6px solid var(--success);
    font-weight: 500;
    backdrop-filter: blur(10px);
    border: 2px solid rgba(16, 185, 129, 0.3);
    box-shadow: 0 8px 25px rgba(16, 185, 129, 0.2);
    font-size: 1rem;
    line-height: 1.5;
    position: relative;
    overflow: hidden;
}

.answer-explanation::before {
    content: '💡';
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 1.5rem;
    opacity: 0.3;
}

.quiz-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 2.5rem;
}

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

.results-header {
    text-align: center;
    margin-bottom: 3rem;
}

.results-badge {
    display: inline-block;
    background: linear-gradient(135deg, var(--success), var(--accent));
    color: white;
    padding: 0.5rem 1.5rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 1rem;
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
}

.results-header h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--light), #E2E8F0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.results-card {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 2.5rem;
    box-shadow: var(--glass-shadow);
    margin: 2.5rem 0;
    border: 1px solid var(--glass-border);
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--glass-border);
    font-size: 1.1rem;
}

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

.result-item.highlight {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    margin: 0 -2.5rem;
    padding: 1.5rem 2.5rem;
    border-radius: 12px;
    color: white;
}

.result-item span {
    color: rgba(255, 255, 255, 0.8);
    font-weight: 500;
}

.result-item strong {
    color: white;
    font-size: 1.3rem;
    font-weight: 700;
}

.result-item.highlight span,
.result-item.highlight strong {
    color: white;
}

.class-selection {
    text-align: center;
    margin-top: 2.5rem;
}

.selection-info {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 2rem;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
    font-size: 1.1rem;
}

.class-selection h3 {
    color: white;
    margin-bottom: 1rem;
    font-size: 1.4rem;
}

.class-selector {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.class-option {
    background: var(--glass-bg);
    backdrop-filter: blur(15px);
    border: 2px solid var(--glass-border);
    border-radius: 20px;
    padding: 0;
    cursor: pointer;
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}

.class-option::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary), transparent);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 1;
}

.class-option:hover::before {
    opacity: 0.1;
}

.class-option:hover {
    transform: translateY(-5px);
    border-color: var(--primary-light);
    box-shadow: 0 10px 30px rgba(108, 99, 255, 0.2);
}

.class-option.active {
    border-color: var(--primary);
    background: rgba(108, 99, 255, 0.1);
    box-shadow: 0 8px 25px rgba(108, 99, 255, 0.3);
    transform: translateY(-3px);
}

.class-card {
    padding: 2rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1.2rem;
    position: relative;
    z-index: 2;
}

.class-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: 16px;
    box-shadow: 0 4px 15px rgba(108, 99, 255, 0.3);
}

.class-option.active .class-icon {
    background: linear-gradient(135deg, var(--success), var(--accent));
}

.class-info {
    flex: 1;
}

.class-name {
    font-size: 1.4rem;
    font-weight: 800;
    color: white;
    margin-bottom: 0.3rem;
}

.class-label {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
    font-weight: 500;
}

.class-check {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.check-circle {
    width: 18px;
    height: 18px;
    border: 2px solid var(--glass-border);
    border-radius: 50%;
    transition: all 0.3s ease;
}

.class-option.active .check-circle {
    background: var(--success);
    border-color: var(--success);
    box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.2);
}

.results-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

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

.question-container {
    animation: slideIn 0.5s ease-out;
}

.timer-warning {
    animation: pulse 1s infinite;
    color: var(--error);
}

@media (max-width: 768px) {
    .quiz-header {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }
    
    .question-content {
        flex-direction: column;
        gap: 1.5rem;
        height: auto;
    }
    
    .question-image {
        flex: none;
        width: 100%;
        height: 300px;
    }
    
    .question-text {
        font-size: 1.1rem;
        margin-bottom: 1.5rem;
    }
    
    .quiz-navigation {
        flex-direction: column;
        gap: 1.2rem;
    }
    
    .quiz-navigation button {
        width: 100%;
    }
    
    .quiz-container {
        padding: 1.5rem;
    }
    
    .results-actions {
        flex-direction: column;
    }
    
    .quiz-grid {
        grid-template-columns: 1fr;
    }
    
    .quiz-controls {
        justify-content: center;
        width: 100%;
    }
    
    .class-selector {
        grid-template-columns: 1fr;
    }
    
    .class-card {
        padding: 1.5rem;
    }
    
    .sound-toggle {
        min-width: 140px;
    }
    
    .answer-btn {
        padding: 1rem 1.2rem;
        font-size: 0.9rem;
    }
    
    .question-container {
        min-height: auto;
    }
}

@keyframes cardAppear {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.quiz-card {
    animation: cardAppear 0.6s ease-out;
}

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

@media (max-width: 768px) {
    .quiz-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .quiz-card {
        height: 320px;
    }

    .quiz-content {
        padding: 1rem;
    }

    .quiz-title {
        font-size: 1.1rem;
    }
}

.notification {
    position: fixed;
    top: 100px;
    right: 20px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 1rem 1.5rem;
    color: white;
    font-weight: 500;
    z-index: 10000;
    transform: translateX(400px);
    opacity: 0;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.notification.show {
    transform: translateX(0);
    opacity: 1;
}

.notification-success {
    border-left: 4px solid var(--success);
}

.notification-error {
    border-left: 4px solid var(--error);
}

.notification-warning {
    border-left: 4px solid var(--warning);
}

.notification-content {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.notification-icon {
    font-size: 1.2rem;
}

@media (max-width: 768px) {
    .notification {
        right: 10px;
        left: 10px;
        transform: translateY(-100px);
    }
    
    .notification.show {
        transform: translateY(0);
    }
}

.quiz-cover-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 10px;
}

.question-image-content {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top center;
    border-radius: 10px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.question-image:not(:has(img)) {
    display: none !important;
}
.answer-btn.selected {
    border-color: var(--primary) !important;
    background: rgba(108, 99, 255, 0.2) !important;
    transform: translateX(5px) scale(1.05) !important;
    transition: all 0.3s ease !important;
}

.question-container {
    min-height: 400px !important;
}

.quiz-navigation {
    margin-top: 1.5rem !important;
}

.quiz-navigation .luxury-btn {
    padding: 1rem 2rem !important;
    font-size: 1rem !important;
}

.answer-btn {
    transition: all 0.3s ease !important;
}

@media (max-width: 768px) {
    .question-container {
        min-height: 350px !important;
    }
    
    .quiz-navigation .luxury-btn {
        padding: 0.8rem 1.5rem !important;
        font-size: 0.9rem !important;
    }
}