/* Reset e Stili Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --success-color: #48bb78;
    --error-color: #f56565;
    --warning-color: #ed8936;
    --info-color: #4299e1;
    --dark-bg: #1a202c;
    --light-bg: #f7fafc;
    --card-bg: #ffffff;
    --text-primary: #2d3748;
    --text-secondary: #718096;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1), 0 2px 4px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1), 0 6px 10px rgba(0, 0, 0, 0.08);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);
    --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    --border-radius-sm: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 16px;
    --border-radius-xl: 24px;
}

body {
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: var(--text-primary);
    overflow-x: hidden;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(102, 126, 234, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(118, 75, 162, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(72, 187, 120, 0.05) 0%, transparent 50%);
    pointer-events: none;
    z-index: 1;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    position: relative;
    z-index: 2;
}

/* Header Styles */
.header {
    text-align: center;
    margin-bottom: 40px;
    animation: slideDown 0.8s ease-out;
}

.header-content {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: var(--border-radius-xl);
    padding: 30px;
    box-shadow: var(--shadow-xl);
    margin-bottom: 20px;
    position: relative;
    overflow: hidden;
}

.header-content::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transform: rotate(45deg);
    animation: shimmer 3s infinite;
}

.main-title {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.main-title i {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.stats-bar {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}

.stat-item {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    padding: 15px 25px;
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.stat-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.stat-item:hover::before {
    opacity: 0.1;
}

.stat-item i {
    font-size: 1.2rem;
    color: var(--primary-color);
    z-index: 1;
}

.stat-item span {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text-primary);
    z-index: 1;
}

/* Main Content */
.main-content {
    display: grid;
    gap: 30px;
}

/* Welcome Screen Styles */
.welcome-screen {
    text-align: center;
    padding: 40px;
    animation: slideDown 0.8s ease-out;
}

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

.welcome-title {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    animation: pulse 2s infinite;
}

.welcome-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    font-weight: 400;
}

.table-grid-welcome {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.table-welcome-btn {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.7));
    backdrop-filter: blur(10px);
    border: 3px solid var(--border-color);
    border-radius: var(--border-radius-xl);
    padding: 25px;
    cursor: pointer;
    transition: var(--transition-slow);
    position: relative;
    overflow: hidden;
    text-align: left;
    min-height: 160px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.table-welcome-btn::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(102, 126, 234, 0.1), transparent);
    transform: rotate(45deg);
    transition: all 0.6s ease;
    opacity: 0;
}

.table-welcome-btn:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.table-welcome-btn:hover::before {
    opacity: 1;
    animation: shimmer 1.5s infinite;
}

.table-welcome-btn:active {
    transform: translateY(-4px) scale(1.01);
}

.table-number {
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 60px;
}

.table-number i {
    font-size: 2.5rem;
}

.table-label {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.table-preview {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-style: italic;
}

.random-welcome-btn {
    background: linear-gradient(135deg, rgba(237, 137, 54, 0.1), rgba(237, 137, 54, 0.2));
    border-color: var(--warning-color);
}

.random-welcome-btn:hover {
    border-color: var(--warning-color);
    background: linear-gradient(135deg, rgba(237, 137, 54, 0.2), rgba(237, 137, 54, 0.3));
}

.random-welcome-btn .table-number {
    background: linear-gradient(135deg, var(--warning-color), #dd6b20);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Game Screen Styles */
.game-area {
    animation: fadeInUp 0.8s ease-out;
}

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

.selected-table-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.table-indicator {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(102, 126, 234, 0.2));
    padding: 12px 25px;
    border-radius: var(--border-radius-lg);
    border: 2px solid var(--primary-color);
}

.table-indicator span {
    font-weight: 700;
    color: var(--primary-color);
}

.change-table-btn {
    background: linear-gradient(135deg, var(--text-secondary), #4a5568);
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: var(--border-radius-lg);
    cursor: pointer;
    transition: var(--transition-normal);
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
}

.change-table-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Table Reference */
.table-reference {
    margin-top: 30px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.7));
    backdrop-filter: blur(10px);
    border-radius: var(--border-radius-xl);
    padding: 25px;
    border: 2px solid var(--border-color);
}

.reference-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 20px;
    text-align: center;
}

.reference-title span {
    color: var(--primary-color);
    font-weight: 700;
}

.table-grid-reference {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 10px;
    max-width: 600px;
    margin: 0 auto;
}

.table-item-reference {
    background: linear-gradient(135deg, #f7fafc, #edf2f7);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 12px;
    text-align: center;
    font-weight: 500;
    color: var(--text-primary);
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.table-item-reference::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.table-item-reference:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.table-item-reference:hover::before {
    opacity: 0.1;
}

.table-item-reference.current {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-color: var(--primary-color);
    animation: pulse 2s infinite;
}

/* Enhanced Animations */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes bounce {
    0%, 20%, 53%, 80%, 100% {
        transform: translateY(0);
    }
    40%, 43% {
        transform: translateY(-20px);
    }
    70% {
        transform: translateY(-10px);
    }
    90% {
        transform: translateY(-5px);
    }
}

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

@keyframes shimmer {
    0% {
        transform: translateX(-100%) rotate(45deg);
    }
    100% {
        transform: translateX(100%) rotate(45deg);
    }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
    20%, 40%, 60%, 80% { transform: translateX(5px); }
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

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

/* Enhanced hover effects */
.table-welcome-btn {
    animation: float 3s ease-in-out infinite;
}

.table-welcome-btn:nth-child(odd) {
    animation-delay: 0.5s;
}

.table-welcome-btn:nth-child(even) {
    animation-delay: 1s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-5px);
    }
}

/* Enhanced transitions */
.table-welcome-btn,
.table-item-reference,
.change-table-btn,
.submit-btn,
.next-btn,
.skip-btn {
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* Loading animation */
.loading {
    animation: rotate 1s linear infinite;
}

/* Success animation */
.success-animation {
    animation: bounce 0.6s ease-out;
}

/* Error animation */
.error-animation {
    animation: shake 0.5s ease-out;
}

/* Particle effects */
.particle {
    position: fixed;
    pointer-events: none;
    opacity: 0;
    z-index: 9999;
}

.particle.active {
    animation: particle-float 2s ease-out forwards;
}

@keyframes particle-float {
    0% {
        opacity: 1;
        transform: translateY(0) scale(0);
    }
    50% {
        opacity: 1;
        transform: translateY(-50px) scale(1);
    }
    100% {
        opacity: 0;
        transform: translateY(-100px) scale(0.5);
    }
}

/* Game Area */
.question-container {
    text-align: center;
    margin-bottom: 30px;
}

.question-display {
    background: linear-gradient(135deg, #f7fafc, #edf2f7);
    border-radius: var(--border-radius-xl);
    padding: 40px;
    margin-bottom: 30px;
    position: relative;
    overflow: hidden;
}

.question-display::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(102, 126, 234, 0.05), transparent);
    transform: rotate(45deg);
    animation: shimmer 4s infinite;
}

.question-number {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--text-primary);
    flex-wrap: wrap;
}

.first-number,
.second-number,
.operator {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: pulse 2s infinite;
}

.result-input-container {
    position: relative;
}

.answer-input {
    width: 120px;
    padding: 15px;
    font-size: 2rem;
    font-weight: 600;
    text-align: center;
    border: 3px solid var(--border-color);
    border-radius: var(--border-radius-md);
    background: white;
    color: var(--text-primary);
    transition: var(--transition-normal);
    outline: none;
}

.answer-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    transform: scale(1.05);
}

.answer-input:valid {
    border-color: var(--success-color);
}

.answer-input:invalid:not(:placeholder-shown) {
    border-color: var(--error-color);
}

/* Feedback */
.feedback-container {
    margin-bottom: 20px;
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feedback {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 15px 25px;
    border-radius: var(--border-radius-lg);
    font-weight: 500;
    font-size: 1.1rem;
    animation: slideIn 0.5s ease-out;
    transition: var(--transition-normal);
}

.feedback.success {
    background: linear-gradient(135deg, rgba(72, 187, 120, 0.1), rgba(72, 187, 120, 0.2));
    color: var(--success-color);
    border: 2px solid var(--success-color);
}

.feedback.error {
    background: linear-gradient(135deg, rgba(245, 101, 101, 0.1), rgba(245, 101, 101, 0.2));
    color: var(--error-color);
    border: 2px solid var(--error-color);
}

.feedback.warning {
    background: linear-gradient(135deg, rgba(237, 137, 54, 0.1), rgba(237, 137, 54, 0.2));
    color: var(--warning-color);
    border: 2px solid var(--warning-color);
}

.feedback-icon {
    font-size: 1.3rem;
}

/* Action Buttons */
.action-buttons {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}

.submit-btn,
.next-btn,
.skip-btn,
.restart-btn,
.home-btn {
    padding: 15px 30px;
    border: none;
    border-radius: var(--border-radius-lg);
    font-size: 1.1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-normal);
    display: flex;
    align-items: center;
    gap: 10px;
    position: relative;
    overflow: hidden;
}

.submit-btn {
    background: linear-gradient(135deg, var(--success-color), #38a169);
    color: white;
}

.submit-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.submit-btn:active {
    transform: translateY(-1px);
}

.next-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

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

.skip-btn {
    background: linear-gradient(135deg, var(--warning-color), #dd6b20);
    color: white;
}

.skip-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.restart-btn {
    background: linear-gradient(135deg, var(--info-color), #3182ce);
    color: white;
}

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

.home-btn {
    background: linear-gradient(135deg, var(--text-secondary), #4a5568);
    color: white;
}

.home-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

/* Progress */
.progress-container {
    background: linear-gradient(135deg, #f7fafc, #edf2f7);
    border-radius: var(--border-radius-lg);
    padding: 20px;
}

.progress-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 15px;
    font-weight: 500;
    color: var(--text-secondary);
}

.progress-bar {
    width: 100%;
    height: 10px;
    background: var(--border-color);
    border-radius: 5px;
    overflow: hidden;
    position: relative;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 5px;
    transition: width 0.5s ease-out;
    position: relative;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 2s infinite;
}

/* Results Section */
.results-section {
    animation: fadeInUp 0.8s ease-out;
}

.results-container {
    text-align: center;
}

.results-title {
    font-size: 2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.results-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.result-stat {
    background: linear-gradient(135deg, #f7fafc, #edf2f7);
    border-radius: var(--border-radius-lg);
    padding: 20px;
    text-align: center;
    transition: var(--transition-normal);
}

.result-stat:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 5px;
}

.stat-label {
    color: var(--text-secondary);
    font-weight: 500;
}

.achievement-badges {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.achievement-badge {
    background: linear-gradient(135deg, #ffd700, #ffed4e);
    color: #744210;
    padding: 10px 20px;
    border-radius: var(--border-radius-lg);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    opacity: 0.3;
    transition: var(--transition-normal);
}

.achievement-badge.earned {
    opacity: 1;
    animation: bounce 0.6s ease-out;
}

.achievement-badge i {
    font-size: 1.1rem;
}

/* Leaderboard */
.leaderboard-tabs {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 20px;
}

.tab-btn {
    padding: 10px 20px;
    border: 2px solid var(--border-color);
    background: linear-gradient(135deg, #f7fafc, #edf2f7);
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: var(--transition-normal);
    font-weight: 500;
    color: var(--text-secondary);
}

.tab-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.tab-btn.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-color: var(--primary-color);
    color: white;
}

.leaderboard-list {
    max-height: 400px;
    overflow-y: auto;
}

.leaderboard-entry {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px;
    background: linear-gradient(135deg, #f7fafc, #edf2f7);
    border-radius: var(--border-radius-md);
    margin-bottom: 10px;
    transition: var(--transition-normal);
}

.leaderboard-entry:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-md);
}

.leaderboard-rank {
    font-weight: 600;
    color: var(--primary-color);
    margin-right: 15px;
}

.leaderboard-name {
    flex: 1;
    font-weight: 500;
}

.leaderboard-score {
    font-weight: 600;
    color: var(--secondary-color);
}

/* Footer */
.footer {
    text-align: center;
    margin-top: 40px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: var(--border-radius-lg);
    color: white;
}

.footer-content {
    font-size: 0.9rem;
    opacity: 0.8;
}

.footer-content i {
    color: #ff6b6b;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: white;
    border-radius: var(--border-radius-xl);
    padding: 30px;
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    transform: scale(0.9);
    transition: var(--transition-normal);
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.modal-header h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.2rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-normal);
    padding: 5px;
}

.close-btn:hover {
    color: var(--error-color);
}

.setting-group {
    margin-bottom: 20px;
}

.setting-label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-weight: 500;
    color: var(--text-primary);
}

.setting-label input[type="checkbox"] {
    margin-right: 10px;
}

.setting-label select {
    padding: 8px 12px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-md);
    background: white;
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition-normal);
}

.setting-label select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.reset-btn {
    background: linear-gradient(135deg, var(--error-color), #e53e3e);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: var(--transition-normal);
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    justify-content: center;
}

.reset-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Settings Button */
.settings-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: var(--transition-normal);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
}

.settings-btn:hover {
    transform: scale(1.1) rotate(90deg);
    box-shadow: var(--shadow-xl);
}

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

.text-center {
    text-align: center;
}

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

.slide-up {
    animation: slideUp 0.5s ease-out;
}

.slide-down {
    animation: slideDown 0.5s ease-out;
}

.bounce {
    animation: bounce 0.6s ease-out;
}

.pulse {
    animation: pulse 2s infinite;
}

.shimmer {
    animation: shimmer 2s infinite;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

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

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

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

@keyframes bounce {
    0%, 20%, 53%, 80%, 100% {
        transform: translateY(0);
    }
    40%, 43% {
        transform: translateY(-30px);
    }
    70% {
        transform: translateY(-15px);
    }
    90% {
        transform: translateY(-4px);
    }
}

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

@keyframes shimmer {
    0% {
        transform: translateX(-100%) rotate(45deg);
    }
    100% {
        transform: translateX(100%) rotate(45deg);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .main-title {
        font-size: 2rem;
    }
    
    .question-number {
        font-size: 1.8rem;
        gap: 10px;
    }
    
    .answer-input {
        width: 80px;
        font-size: 1.5rem;
        padding: 10px;
    }
    
    .mode-buttons {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .table-grid {
        grid-template-columns: repeat(auto-fit, minmax(60px, 1fr));
        gap: 10px;
    }
    
    .stats-bar {
        gap: 15px;
    }
    
    .stat-item {
        padding: 10px 15px;
    }
    
    .results-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .action-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .submit-btn,
    .next-btn,
    .skip-btn,
    .restart-btn,
    .home-btn {
        width: 100%;
        max-width: 250px;
    }
}

@media (max-width: 480px) {
    .main-title {
        font-size: 1.5rem;
        flex-direction: column;
        gap: 10px;
    }
    
    .section-title {
        font-size: 1.2rem;
    }
    
    .question-display {
        padding: 20px;
    }
    
    .question-number {
        font-size: 1.5rem;
    }
    
    .answer-input {
        width: 60px;
        font-size: 1.2rem;
    }
    
    .table-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .random-btn {
        grid-column: span 3;
    }
    
    .results-title {
        font-size: 1.5rem;
    }
    
    .achievement-badges {
        flex-direction: column;
        align-items: center;
    }
    
    .settings-btn {
        width: 50px;
        height: 50px;
        font-size: 1.2rem;
        bottom: 20px;
        right: 20px;
    }
}

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

/* Focus styles for better accessibility */
button:focus-visible,
input:focus-visible,
select:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --text-secondary: #000000;
    }
    
    .header-content,
    section {
        border: 2px solid var(--border-color);
    }
}