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

:root {
    --bg-primary: #f0f4f8;
    --bg-secondary: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --card-shadow: 0 10px 25px -5px rgba(0,0,0,0.05), 0 8px 10px -6px rgba(0,0,0,0.02);
    --hover-shadow: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
    --primary-gradient: linear-gradient(135deg, #4361ee 0%, #3a0ca3 100%);
    --success: #10b981;
    --error: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
    --danger: #ef233c;
    --premium: linear-gradient(135deg, #f72585 0%, #b5179e 100%);
}

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #334155;
}

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: all 0.3s ease;
    min-height: 100vh;
}

.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
    position: relative;
}

/* Header Styles */
.main-header {
    background: var(--bg-secondary);
    border-radius: 24px;
    padding: 20px 30px;
    margin-bottom: 30px;
    box-shadow: var(--card-shadow);
    border: 1px solid var(--border-color);
}

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

.logo-area {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-area i {
    font-size: 32px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.logo-area h1 {
    font-size: 24px;
    font-weight: 700;
}

.header-actions {
    display: flex;
    gap: 12px;
}

.theme-toggle, .stats-btn {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 40px;
    padding: 10px 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--text-primary);
}

.theme-toggle:hover, .stats-btn:hover {
    transform: scale(1.05);
    background: var(--primary-gradient);
    color: white;
}

.stats-badge {
    background: var(--primary-gradient);
    border-radius: 20px;
    padding: 2px 8px;
    margin-left: 8px;
    font-size: 12px;
    color: white;
}

.tagline {
    margin-top: 12px;
    font-size: 14px;
    color: var(--text-secondary);
    text-align: center;
}

/* Level Cards */
.levels-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

.level-card {
    background: var(--bg-secondary);
    border-radius: 28px;
    padding: 32px 24px;
    text-align: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
    cursor: pointer;
}

.level-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--hover-shadow);
}

.level-card[data-level="easy"]:hover {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
}

.level-card[data-level="average"]:hover {
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
}

.level-card[data-level="hard"]:hover {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
}

.level-card:hover h3,
.level-card:hover p,
.level-card:hover .level-stats,
.level-card:hover .level-icon i {
    color: white;
}

.level-icon i {
    font-size: 48px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    transition: all 0.3s;
}

.level-card h3 {
    font-size: 28px;
    margin: 16px 0 8px;
    font-weight: 700;
}

.level-card p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 20px;
}

.level-stats {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.start-btn {
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: 40px;
    padding: 12px 32px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    width: 100%;
}

.start-btn:hover {
    transform: scale(1.02);
}

/* Quiz Container */
.quiz-container {
    background: var(--bg-secondary);
    border-radius: 28px;
    padding: 30px;
    border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
}

.quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--border-color);
}

.quiz-info {
    display: flex;
    gap: 12px;
}

.quiz-level {
    background: var(--primary-gradient);
    padding: 6px 14px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 13px;
    color: white;
}

.quiz-subject {
    background: var(--bg-primary);
    padding: 6px 14px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 13px;
}

.quiz-timer {
    font-size: 20px;
    font-weight: 700;
    color: var(--warning);
}

.quiz-progress {
    font-weight: 600;
}

.quiz-lives {
    color: var(--danger);
    font-weight: 600;
}

.quiz-score {
    color: var(--success);
    font-weight: 600;
}

.progress-bar-container {
    background: var(--border-color);
    border-radius: 10px;
    height: 8px;
    margin-bottom: 30px;
    overflow: hidden;
}

.progress-bar-fill {
    background: var(--primary-gradient);
    height: 100%;
    width: 0%;
    transition: width 0.3s ease;
    border-radius: 10px;
}

.question-card {
    margin-bottom: 25px;
}

.question-text {
    font-size: 20px;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 25px;
}

.options-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.option {
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: 16px;
    padding: 16px 20px;
    cursor: pointer;
    transition: all 0.3s;
    font-weight: 500;
}

.option:hover {
    border-color: var(--info);
    transform: translateX(4px);
}

.option.selected {
    background: var(--info);
    border-color: var(--info);
    color: white;
}

.option.correct {
    background: var(--success);
    border-color: var(--success);
    color: white;
}

.option.incorrect {
    background: var(--error);
    border-color: var(--error);
    color: white;
}

.option.disabled {
    pointer-events: none;
    opacity: 0.6;
}

.explanation-box {
    background: var(--bg-primary);
    border-radius: 20px;
    padding: 20px;
    margin: 20px 0;
    border-left: 4px solid var(--info);
}

.explanation-header {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    margin-bottom: 10px;
}

.explanation-text {
    font-size: 14px;
    line-height: 1.5;
    margin-bottom: 10px;
}

.factoid-text {
    font-size: 13px;
    color: var(--text-secondary);
    font-style: italic;
    padding-top: 10px;
    border-top: 1px solid var(--border-color);
}

.quiz-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;
    margin-top: 25px;
}

.powerups {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.powerup-btn {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 10px 14px;
    cursor: pointer;
    transition: all 0.3s;
    font-weight: 600;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    position: relative;
}

.powerup-btn:hover:not(:disabled) {
    transform: scale(1.05);
    background: var(--warning);
    color: white;
}

.powerup-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.powerup-btn.premium {
    background: var(--premium);
    color: white;
    border: none;
}

.premium-badge {
    position: absolute;
    top: -8px;
    right: -8px;
    background: gold;
    color: #333;
    font-size: 8px;
    padding: 2px 6px;
    border-radius: 10px;
    font-weight: 700;
}

.powerup-count {
    background: var(--primary-gradient);
    border-radius: 20px;
    padding: 2px 6px;
    font-size: 10px;
    color: white;
}

.powerup-label {
    font-size: 10px;
}

.next-btn {
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: 40px;
    padding: 12px 28px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.next-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.next-btn:hover:not(:disabled) {
    transform: scale(1.02);
}

/* Results Container */
.results-card {
    background: var(--bg-secondary);
    border-radius: 32px;
    padding: 40px;
    text-align: center;
    border: 1px solid var(--border-color);
}

#trophyIcon {
    font-size: 64px;
    color: var(--warning);
    margin-bottom: 20px;
}

.results-card h2 {
    font-size: 28px;
    margin-bottom: 25px;
}

.score-circle {
    width: 150px;
    height: 150px;
    background: var(--primary-gradient);
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    color: white;
}

.score-value {
    font-size: 48px;
    font-weight: 800;
}

.score-label {
    font-size: 14px;
    opacity: 0.9;
}

.quiz-stats {
    margin: 20px 0;
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}

.quiz-stats p {
    font-size: 14px;
}

.badge-earned {
    background: var(--primary-gradient);
    color: white;
    padding: 10px 24px;
    border-radius: 40px;
    display: inline-block;
    font-weight: 600;
    margin-bottom: 30px;
}

/* Reactions Section */
.reactions-section, .social-share-section {
    margin: 30px 0;
}

.reactions-section h4, .social-share-section h4 {
    margin-bottom: 15px;
    font-size: 16px;
}

.emoji-reactions {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.reaction-emoji {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 40px;
    padding: 8px 16px;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 16px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.reaction-emoji:hover {
    transform: scale(1.1);
    background: var(--warning);
    color: white;
}

.social-icons {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
    margin-bottom: 15px;
}

.social-icon {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 20px;
    color: white;
}

.social-icon[data-platform="facebook"] { background: #1877f2; }
.social-icon[data-platform="twitter"] { background: #1da1f2; }
.social-icon[data-platform="whatsapp"] { background: #25d366; }
.social-icon[data-platform="linkedin"] { background: #0077b5; }
.social-icon[data-platform="email"] { background: #ea4335; }

.social-icon:hover {
    transform: scale(1.1);
}

.copy-share-buttons {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}

.copy-url-btn, .download-results-btn {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 40px;
    padding: 10px 20px;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.copy-url-btn:hover, .download-results-btn:hover {
    background: var(--info);
    color: white;
}

.action-buttons {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
    margin-top: 20px;
}

.try-again-btn, .view-badges-btn {
    padding: 12px 24px;
    border-radius: 40px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.try-again-btn {
    background: var(--primary-gradient);
    color: white;
    border: none;
}

.view-badges-btn {
    background: transparent;
    border: 2px solid var(--primary-gradient);
    color: var(--text-primary);
}

/* Badges Container */
.badges-container {
    background: var(--bg-secondary);
    border-radius: 28px;
    padding: 30px;
}

.badges-header {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 30px;
}

.back-btn {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 40px;
    padding: 8px 16px;
    cursor: pointer;
    transition: all 0.3s;
}

.badges-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 20px;
}

.badge-card {
    background: var(--bg-primary);
    border-radius: 20px;
    padding: 20px;
    text-align: center;
    transition: all 0.3s;
    border: 1px solid var(--border-color);
}

.badge-card.unlocked {
    background: var(--primary-gradient);
    color: white;
}

.badge-card.locked {
    opacity: 0.6;
}

.badge-icon {
    font-size: 36px;
    margin-bottom: 10px;
}

.badge-title {
    font-weight: 700;
    font-size: 14px;
    margin-bottom: 5px;
}

.badge-desc {
    font-size: 11px;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: 28px;
    padding: 40px;
    max-width: 450px;
    width: 90%;
    text-align: center;
    position: relative;
}

.close-modal {
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 28px;
    cursor: pointer;
    color: var(--text-secondary);
}

.modal-icon i {
    font-size: 56px;
    color: gold;
    margin-bottom: 15px;
}

.modal-content h2 {
    margin-bottom: 10px;
}

.modal-content ul {
    list-style: none;
    margin: 20px 0;
    text-align: left;
}

.modal-content ul li {
    margin: 10px 0;
    display: flex;
    align-items: center;
    gap: 10px;
}

.modal-content ul li i {
    color: var(--success);
}

.upgrade-btn {
    background: var(--premium);
    color: white;
    border: none;
    border-radius: 40px;
    padding: 14px;
    width: 100%;
    font-weight: 700;
    cursor: pointer;
    margin-bottom: 10px;
}

.maybe-later-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.9);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255,255,255,0.2);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-overlay p {
    color: white;
    margin-top: 15px;
}

/* Scroll Buttons */
.scroll-btn {
    position: fixed;
    right: 20px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--primary-gradient);
    border: none;
    color: white;
    cursor: pointer;
    transition: all 0.3s;
    z-index: 99;
    box-shadow: var(--card-shadow);
}

.scroll-btn:hover {
    transform: scale(1.1);
}

.scroll-up {
    bottom: 80px;
}

.scroll-down {
    bottom: 20px;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 10px;
    align-items: center;
}

.toast {
    background: var(--bg-secondary);
    color: var(--text-primary);
    padding: 12px 24px;
    border-radius: 40px;
    box-shadow: var(--hover-shadow);
    font-size: 14px;
    font-weight: 500;
    animation: slideUp 0.3s ease;
    border-left: 4px solid var(--success);
}

.toast.error {
    border-left-color: var(--error);
}

.toast.warning {
    border-left-color: var(--warning);
}

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

/* Mobile Responsive */
@media (max-width: 768px) {
    .app-container {
        padding: 12px;
    }
    
    .levels-container {
        grid-template-columns: 1fr;
    }
    
    .quiz-container {
        padding: 20px;
    }
    
    .question-text {
        font-size: 18px;
    }
    
    .option {
        padding: 14px;
        font-size: 14px;
    }
    
    .quiz-header {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
    }
    
    .quiz-info {
        justify-content: center;
    }
    
    .quiz-footer {
        flex-direction: column;
    }
    
    .powerups {
        width: 100%;
        justify-content: center;
    }
    
    .next-btn {
        width: 100%;
    }
    
    .results-card {
        padding: 25px;
    }
    
    .emoji-reactions {
        gap: 8px;
    }
    
    .reaction-emoji {
        padding: 6px 12px;
        font-size: 14px;
    }
    
    .badges-grid {
        grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    }
}

@media (max-width: 480px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }
    
    .score-circle {
        width: 120px;
        height: 120px;
    }
    
    .score-value {
        font-size: 36px;
    }
    
    .quiz-stats {
        gap: 15px;
    }
}