:root {
    --primary-blue: #2196F3;
    --success-green: #4CAF50;
    --warning-yellow: #FFC107;
    --danger-red: #F44336;
    --accent-purple: #9C27B0;
    
    --bg-dark: #0a0a0a;
    --bg-dark-secondary: #1a1a1a;
    --bg-dark-tertiary: #2a2a2a;
    --text-light: #ffffff;
    --text-secondary: #cccccc;
    --text-muted: #888888;
    
    --gradient-primary: linear-gradient(135deg, var(--primary-blue), var(--accent-purple));
    --gradient-success: linear-gradient(135deg, var(--success-green), #66BB6A);
    --gradient-warning: linear-gradient(135deg, var(--warning-yellow), #FFD54F);
    --gradient-danger: linear-gradient(135deg, var(--danger-red), #EF5350);
    
    --shadow-glow: 0 0 20px rgba(33, 150, 243, 0.3);
    --shadow-glow-success: 0 0 20px rgba(76, 175, 80, 0.3);
    --shadow-glow-warning: 0 0 20px rgba(255, 193, 7, 0.3);
    --shadow-glow-danger: 0 0 20px rgba(244, 67, 54, 0.3);
    
    --border-radius: 12px;
    --border-radius-small: 8px;
    --border-radius-large: 20px;
    
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-dark);
    color: var(--text-light);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(33, 150, 243, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(156, 39, 176, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 80%, rgba(76, 175, 80, 0.05) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    padding-bottom: 80px;
}

/* Header */
.app-header {
    background: var(--bg-dark-secondary);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding: 1rem;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.app-header h1 {
    font-size: 1.5rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.language-toggle .lang-btn {
    background: var(--bg-dark-tertiary);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-light);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius-small);
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.language-toggle .lang-btn:hover {
    background: var(--bg-dark);
    box-shadow: var(--shadow-glow);
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 1rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.content-section {
    display: none;
    animation: fadeIn 0.3s ease;
}

.content-section.active {
    display: block;
}

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

/* Home Section */
.welcome-screen {
    text-align: center;
    padding: 2rem 0;
}

.game-logo {
    margin-bottom: 3rem;
}

.logo-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    animation: pulse 2s infinite;
}

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

.game-logo h2 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.game-logo p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.stats-display {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
    margin-bottom: 3rem;
    padding: 0 1rem;
}

.stat-item {
    background: var(--bg-dark-secondary);
    padding: 1.5rem 1rem;
    border-radius: var(--border-radius);
    border: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    transition: var(--transition-normal);
}

.stat-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.stat-value {
    display: block;
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary-blue);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.game-modes {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    max-width: 400px;
    margin: 0 auto;
}

.mode-btn {
    background: var(--bg-dark-secondary);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-light);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    font-size: 1.1rem;
    font-weight: 500;
}

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

.mode-btn.arcade-mode:hover {
    background: var(--gradient-primary);
    box-shadow: var(--shadow-glow);
}

.mode-btn.challenge-mode:hover {
    background: var(--gradient-warning);
    box-shadow: var(--shadow-glow-warning);
}

.mode-btn.versus-mode:hover {
    background: var(--gradient-success);
    box-shadow: var(--shadow-glow-success);
}

/* Game Section */
.game-container {
    max-width: 600px;
    margin: 0 auto;
    position: relative;
}

.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-dark-secondary);
    padding: 1rem;
    border-radius: var(--border-radius);
    margin-bottom: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.game-info {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.game-info > div {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.game-info span:first-child {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.game-info span:last-child {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--primary-blue);
}

.pause-btn {
    background: var(--bg-dark-tertiary);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-light);
    padding: 0.75rem;
    border-radius: var(--border-radius-small);
    cursor: pointer;
    transition: var(--transition-fast);
    font-size: 1.2rem;
}

.pause-btn:hover {
    background: var(--primary-blue);
    box-shadow: var(--shadow-glow);
}

.game-area {
    background: var(--bg-dark-secondary);
    border-radius: var(--border-radius-large);
    padding: 3rem 2rem;
    margin-bottom: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    position: relative;
    min-height: 400px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    user-select: none;
    touch-action: none;
}

.swipe-target {
    position: relative;
    width: 150px;
    height: 150px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 2rem;
    cursor: pointer;
}

.target-ring {
    position: absolute;
    width: 100%;
    height: 100%;
    border: 3px solid var(--primary-blue);
    border-radius: 50%;
    animation: ringPulse 2s infinite;
}

@keyframes ringPulse {
    0%, 100% { 
        transform: scale(1); 
        opacity: 1; 
    }
    50% { 
        transform: scale(1.1); 
        opacity: 0.7; 
    }
}

.direction-indicator {
    font-size: 3rem;
    color: var(--primary-blue);
    z-index: 2;
    transition: var(--transition-fast);
}

.direction-indicator.correct {
    color: var(--success-green);
    animation: correctPulse 0.3s ease;
}

.direction-indicator.incorrect {
    color: var(--danger-red);
    animation: shake 0.5s ease;
}

@keyframes correctPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.3); }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

.feedback-area {
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
}

.feedback-message {
    font-size: 1.2rem;
    font-weight: bold;
    text-align: center;
    opacity: 0;
    transition: var(--transition-fast);
}

.feedback-message.show {
    opacity: 1;
    animation: feedbackPop 0.5s ease;
}

@keyframes feedbackPop {
    0% { transform: scale(0.8); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

.feedback-message.correct {
    color: var(--success-green);
}

.feedback-message.incorrect {
    color: var(--danger-red);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-dark-tertiary);
    border-radius: 4px;
    overflow: hidden;
    position: absolute;
    bottom: 1rem;
    left: 1rem;
    right: 1rem;
    width: calc(100% - 2rem);
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    transition: width 0.1s linear;
    width: 100%;
}

.game-controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.control-btn {
    background: var(--bg-dark-secondary);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-light);
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.control-btn:hover {
    background: var(--primary-blue);
    box-shadow: var(--shadow-glow);
}

/* Game Over Screen */
.game-over-screen {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.95);
    display: none;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius-large);
    z-index: 10;
}

.game-over-screen.show {
    display: flex;
    animation: fadeIn 0.5s ease;
}

.game-over-content {
    text-align: center;
    padding: 2rem;
    background: var(--bg-dark-secondary);
    border-radius: var(--border-radius);
    border: 1px solid rgba(255, 255, 255, 0.2);
    max-width: 90%;
    width: 400px;
}

.game-over-content h3 {
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--danger-red);
}

.final-stats {
    margin-bottom: 2rem;
}

.final-stat {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1rem;
    padding: 0.5rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.final-stat:last-child {
    border-bottom: none;
}

.final-stat span:last-child {
    font-weight: bold;
    color: var(--primary-blue);
}

.game-over-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.action-btn {
    padding: 1rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
}

.action-btn.primary {
    background: var(--gradient-primary);
    color: var(--text-light);
}

.action-btn.secondary {
    background: var(--bg-dark-tertiary);
    color: var(--text-light);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.action-btn.danger {
    background: var(--gradient-danger);
    color: var(--text-light);
}

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

/* Leaderboard Section */
.leaderboard-container {
    max-width: 800px;
    margin: 0 auto;
}

.leaderboard-container h2 {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 2rem;
}

.leaderboard-filters {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    justify-content: center;
    flex-wrap: wrap;
}

.leaderboard-filters select {
    background: var(--bg-dark-secondary);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-light);
    padding: 0.75rem 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition-fast);
}

.leaderboard-filters select:hover,
.leaderboard-filters select:focus {
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-glow);
}

.leaderboard-list {
    background: var(--bg-dark-secondary);
    border-radius: var(--border-radius);
    border: 1px solid rgba(255, 255, 255, 0.1);
    overflow: hidden;
}

.leaderboard-item {
    display: flex;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition-fast);
}

.leaderboard-item:hover {
    background: var(--bg-dark-tertiary);
}

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

.leaderboard-rank {
    width: 60px;
    text-align: center;
    font-weight: bold;
    font-size: 1.2rem;
}

.leaderboard-rank.first {
    color: #FFD700;
}

.leaderboard-rank.second {
    color: #C0C0C0;
}

.leaderboard-rank.third {
    color: #CD7F32;
}

.leaderboard-info {
    flex: 1;
    margin-left: 1rem;
}

.leaderboard-score {
    font-weight: bold;
    color: var(--primary-blue);
    font-size: 1.1rem;
}

.leaderboard-details {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.leaderboard-empty {
    padding: 3rem;
    text-align: center;
    color: var(--text-secondary);
}

.leaderboard-empty i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

/* Settings Section */
.settings-container {
    max-width: 600px;
    margin: 0 auto;
}

.settings-container h2 {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 2rem;
}

.settings-group {
    background: var(--bg-dark-secondary);
    border-radius: var(--border-radius);
    padding: 2rem;
    margin-bottom: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.settings-group h3 {
    margin-bottom: 1.5rem;
    color: var(--primary-blue);
    font-size: 1.3rem;
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.setting-item:last-child {
    margin-bottom: 0;
}

.setting-item label {
    font-weight: 500;
    color: var(--text-light);
}

.setting-item select,
.setting-item input[type="range"] {
    background: var(--bg-dark-tertiary);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-light);
    padding: 0.5rem;
    border-radius: var(--border-radius-small);
    min-width: 150px;
}

.setting-item select:focus,
.setting-item input[type="range"]:focus {
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-glow);
}

.toggle-switch {
    position: relative;
    width: 60px;
    height: 30px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-label {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-dark-tertiary);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: var(--transition-fast);
    border-radius: 15px;
}

.toggle-label:before {
    position: absolute;
    content: "";
    height: 22px;
    width: 22px;
    left: 3px;
    bottom: 3px;
    background: var(--text-light);
    transition: var(--transition-fast);
    border-radius: 50%;
}

.toggle-switch input:checked + .toggle-label {
    background: var(--primary-blue);
    border-color: var(--primary-blue);
}

.toggle-switch input:checked + .toggle-label:before {
    transform: translateX(30px);
}

#volume-value {
    min-width: 50px;
    text-align: center;
    color: var(--primary-blue);
    font-weight: bold;
}

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

/* FAQ Section */
.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-container h2 {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 2rem;
}

.faq-list {
    background: var(--bg-dark-secondary);
    border-radius: var(--border-radius);
    border: 1px solid rgba(255, 255, 255, 0.1);
    overflow: hidden;
}

.faq-item {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

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

.faq-question {
    width: 100%;
    background: none;
    border: none;
    color: var(--text-light);
    padding: 1.5rem;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.1rem;
    font-weight: 500;
    transition: var(--transition-fast);
}

.faq-question:hover {
    background: var(--bg-dark-tertiary);
}

.faq-icon {
    font-size: 1.5rem;
    color: var(--primary-blue);
    transition: var(--transition-fast);
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 1.5rem 1.5rem;
    color: var(--text-secondary);
    line-height: 1.6;
    animation: slideDown 0.3s ease;
}

.faq-answer[hidden] {
    display: none;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Bottom Navigation */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-dark-secondary);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-around;
    padding: 0.75rem 0.5rem;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--text-secondary);
    transition: var(--transition-fast);
    padding: 0.5rem;
    border-radius: var(--border-radius-small);
    min-width: 60px;
}

.nav-item:hover,
.nav-item.active {
    color: var(--primary-blue);
    background: rgba(33, 150, 243, 0.1);
}

.nav-item i {
    font-size: 1.2rem;
    margin-bottom: 0.25rem;
}

.nav-item span {
    font-size: 0.75rem;
    font-weight: 500;
}

/* Footer */
footer {
    background: var(--bg-dark-secondary);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 1rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: auto;
    margin-bottom:85px;
}

footer p {
    margin: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .app-header {
        padding: 0.75rem 1rem;
    }
    
    .app-header h1 {
        font-size: 1.25rem;
    }
    
    .main-content {
        padding: 0.75rem;
    }
    
    .stats-display {
        grid-template-columns: repeat(3, 1fr);
        gap: 0.75rem;
    }
    
    .stat-item {
        padding: 1rem 0.5rem;
    }
    
    .stat-value {
        font-size: 1.5rem;
    }
    
    .game-info {
        gap: 1rem;
        justify-content: space-around;
    }
    
    .game-area {
        padding: 2rem 1rem;
        min-height: 350px;
    }
    
    .swipe-target {
        width: 120px;
        height: 120px;
    }
    
    .direction-indicator {
        font-size: 2.5rem;
    }
    
    .game-over-content {
        padding: 1.5rem;
        width: 95%;
    }
    
    .game-over-actions {
        flex-direction: column;
    }
    
    .leaderboard-filters {
        flex-direction: column;
        align-items: center;
    }
    
    .leaderboard-filters select {
        width: 200px;
    }
    
    .settings-group {
        padding: 1.5rem;
    }
    
    .setting-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .settings-actions {
        flex-direction: column;
    }
    
    .nav-item span {
        font-size: 0.7rem;
    }
}

@media (max-width: 480px) {
    .stats-display {
        grid-template-columns: 1fr 1fr;
        gap: 0.5rem;
    }
    
    .game-logo h2 {
        font-size: 2rem;
    }
    
    .game-area {
        padding: 1.5rem 0.75rem;
        min-height: 300px;
    }
    
    .swipe-target {
        width: 100px;
        height: 100px;
    }
    
    .direction-indicator {
        font-size: 2rem;
    }
    
    .game-over-content h3 {
        font-size: 1.5rem;
    }
}

/* Theme Variations */
.theme-neon {
    --primary-blue: #00FFFF;
    --success-green: #00FF00;
    --warning-yellow: #FFFF00;
    --danger-red: #FF0080;
    --accent-purple: #FF00FF;
}

.theme-classic {
    --primary-blue: #007ACC;
    --success-green: #28A745;
    --warning-yellow: #FFC107;
    --danger-red: #DC3545;
    --accent-purple: #6F42C1;
}

/* Animations for better UX */
@keyframes glow {
    0%, 100% { box-shadow: var(--shadow-glow); }
    50% { box-shadow: 0 0 30px rgba(33, 150, 243, 0.5); }
}

.animate-glow {
    animation: glow 2s infinite;
}

/* Loading states */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--primary-blue);
    border-top: 2px solid transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

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

/* Focus styles for keyboard navigation */
button:focus,
select:focus,
input:focus,
.nav-item:focus {
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --bg-dark: #000000;
        --bg-dark-secondary: #1a1a1a;
        --text-light: #ffffff;
        --primary-blue: #4da6ff;
    }
}