/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-blue: #2196F3;
    --success-green: #4CAF50;
    --warning-yellow: #FFC107;
    --danger-red: #F44336;
    --accent-purple: #9C27B0;
    --dark-bg: #0a0a0a;
    --card-bg: #1a1a1a;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --border-color: #333;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    --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);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--dark-bg);
    color: var(--text-primary);
    min-height: 100vh;
    padding-bottom: 100px;
    line-height: 1.6;
}

/* Header Styles */
.app-header {
    background: var(--gradient-primary);
    padding: 20px;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content h1 {
    text-align: center;
    font-size: 1.8rem;
    margin-bottom: 15px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.user-info {
    display: flex;
    flex-direction: column;
    gap: 10px;
    align-items: center;
}

.level-badge {
    background: rgba(255, 255, 255, 0.2);
    padding: 5px 15px;
    border-radius: 20px;
    font-weight: bold;
    backdrop-filter: blur(10px);
}

.xp-bar {
    width: 100%;
    max-width: 300px;
    height: 20px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    overflow: hidden;
    position: relative;
    backdrop-filter: blur(10px);
}

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

.xp-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 0.8rem;
    font-weight: bold;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.7);
}

/* Main Content */
.app-main {
    padding: 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.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); }
}

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

/* Cards */
.welcome-card,
.game-card,
.stat-card,
.setting-group {
    background: var(--card-bg);
    border-radius: 15px;
    padding: 20px;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.welcome-card:hover,
.game-card:hover,
.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
}

.welcome-card h2 {
    color: var(--primary-blue);
    margin-bottom: 10px;
    font-size: 1.5rem;
}

/* Stats Overview */
.stats-overview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 15px;
    margin-top: 20px;
}

.stat-item {
    text-align: center;
    padding: 15px;
    background: rgba(33, 150, 243, 0.1);
    border-radius: 10px;
    border: 1px solid var(--primary-blue);
}

.stat-item i {
    font-size: 1.5rem;
    color: var(--primary-blue);
    margin-bottom: 5px;
}

.stat-label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 5px;
}

.stat-value {
    display: block;
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--primary-blue);
}

/* Games Grid */
.games-header {
    text-align: center;
    margin-bottom: 30px;
}

.games-header h2 {
    color: var(--success-green);
    margin-bottom: 10px;
}

.games-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.game-card {
    text-align: center;
    position: relative;
    overflow: hidden;
}

.game-card::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 ease;
}

.game-card:hover::before {
    left: 100%;
}

.game-icon {
    font-size: 3rem;
    margin-bottom: 15px;
    display: block;
}

.game-card h3 {
    color: var(--success-green);
    margin-bottom: 10px;
    font-size: 1.3rem;
}

.game-difficulty {
    margin: 15px 0;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
}

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

.difficulty-stars {
    display: flex;
    gap: 2px;
}

.difficulty-stars i {
    color: var(--warning-yellow);
    font-size: 0.9rem;
}

/* Buttons */
.play-btn,
.btn-primary,
.btn-secondary,
.btn-danger {
    padding: 12px 24px;
    border: none;
    border-radius: 25px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.play-btn,
.btn-primary {
    background: var(--gradient-primary);
    color: white;
}

.play-btn:hover,
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(33, 150, 243, 0.4);
}

.btn-secondary {
    background: var(--card-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--border-color);
    transform: translateY(-2px);
}

.btn-danger {
    background: var(--gradient-danger);
    color: white;
}

.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(244, 67, 54, 0.4);
}

/* Game Play Area */
.game-play-area {
    background: var(--card-bg);
    border-radius: 15px;
    padding: 20px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 10px;
}

.game-header h3 {
    color: var(--success-green);
    font-size: 1.4rem;
}

.game-controls {
    display: flex;
    gap: 10px;
}

.game-stats {
    display: flex;
    justify-content: space-around;
    margin-bottom: 20px;
    padding: 15px;
    background: rgba(33, 150, 243, 0.1);
    border-radius: 10px;
    flex-wrap: wrap;
    gap: 10px;
}

.stat {
    text-align: center;
}

.game-content {
    min-height: 300px;
    background: var(--dark-bg);
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
}

/* Game Results */
.game-results {
    text-align: center;
    padding: 30px;
    background: var(--card-bg);
    border-radius: 15px;
    border: 1px solid var(--success-green);
}

.game-results h3 {
    color: var(--success-green);
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.results-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin-bottom: 30px;
}

.result-item {
    padding: 15px;
    background: rgba(76, 175, 80, 0.1);
    border-radius: 10px;
    border: 1px solid var(--success-green);
}

.result-label {
    display: block;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 5px;
}

.result-value {
    display: block;
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--success-green);
}

.results-actions {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}

/* Statistics */
.stats-header {
    text-align: center;
    margin-bottom: 30px;
}

.stats-header h2 {
    color: var(--warning-yellow);
    margin-bottom: 10px;
}

.stats-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 20px;
}

.stat-icon {
    font-size: 2.5rem;
    color: var(--warning-yellow);
}

.stat-info h3 {
    font-size: 1.8rem;
    color: var(--warning-yellow);
    margin-bottom: 5px;
}

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

.progress-charts {
    background: var(--card-bg);
    border-radius: 15px;
    padding: 20px;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

.progress-charts h3 {
    color: var(--warning-yellow);
    margin-bottom: 20px;
    text-align: center;
}

.charts-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 200px;
}

.recent-games {
    background: var(--card-bg);
    border-radius: 15px;
    padding: 20px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

.recent-games h3 {
    color: var(--warning-yellow);
    margin-bottom: 20px;
}

.recent-games-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.game-history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    background: rgba(255, 193, 7, 0.1);
    border-radius: 10px;
    border: 1px solid var(--warning-yellow);
}

.game-info {
    display: flex;
    flex-direction: column;
}

.game-name {
    font-weight: bold;
    color: var(--warning-yellow);
    margin-bottom: 2px;
}

.game-date {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.game-score {
    font-weight: bold;
    color: var(--success-green);
}

.no-games,
.no-achievements {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
    font-style: italic;
}

/* Settings */
.settings-header {
    text-align: center;
    margin-bottom: 30px;
}

.settings-header h2 {
    color: var(--accent-purple);
    margin-bottom: 10px;
}

.settings-groups {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.setting-group h3 {
    color: var(--accent-purple);
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    flex-wrap: wrap;
    gap: 10px;
}

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

.setting-input {
    background: var(--dark-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 8px 12px;
    color: var(--text-primary);
    font-size: 0.9rem;
    min-width: 150px;
}

.setting-input:focus {
    outline: none;
    border-color: var(--accent-purple);
    box-shadow: 0 0 0 2px rgba(156, 39, 176, 0.2);
}

/* Toggle Switch */
.toggle-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    gap: 10px;
}

.toggle-input {
    display: none;
}

.toggle-slider {
    width: 50px;
    height: 24px;
    background: var(--border-color);
    border-radius: 24px;
    position: relative;
    transition: background 0.3s ease;
}

.toggle-slider::before {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: white;
    top: 2px;
    left: 2px;
    transition: transform 0.3s ease;
}

.toggle-input:checked + .toggle-slider {
    background: var(--accent-purple);
}

.toggle-input:checked + .toggle-slider::before {
    transform: translateX(26px);
}

/* Achievements */
.achievements-section {
    background: var(--card-bg);
    border-radius: 15px;
    padding: 20px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

.achievements-section h3 {
    color: var(--warning-yellow);
    margin-bottom: 20px;
}

.achievements-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.achievement-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 15px;
    background: rgba(255, 193, 7, 0.1);
    border-radius: 10px;
    border: 1px solid var(--warning-yellow);
}

.achievement-icon {
    font-size: 1.5rem;
}

.achievement-info {
    flex: 1;
}

.achievement-name {
    font-weight: bold;
    color: var(--warning-yellow);
    margin-bottom: 2px;
}

.achievement-desc {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* FAQ Section */
.faq-header {
    text-align: center;
    margin-bottom: 30px;
}

.faq-header h2 {
    color: var(--primary-blue);
    margin-bottom: 10px;
    font-size: 2rem;
}

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

.faq-container {
    display: flex;
    flex-direction: column;
    gap: 15px;
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.faq-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
}

.faq-question {
    width: 100%;
    background: var(--dark-bg);
    border: none;
    padding: 25px;
    text-align: left;
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.3s ease;
}

.faq-question:hover {
    background: rgba(33, 150, 243, 0.1);
}

.faq-icon {
    font-size: 1.3rem;
    color: var(--primary-blue);
    transition: transform 0.3s ease;
    font-weight: bold;
}

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

.faq-answer {
    background: var(--card-bg);
    padding: 0 25px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-answer.show {
    padding: 25px;
    max-height: 300px;
}

.faq-answer p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 1rem;
}

/* Bottom Navigation */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-around;
    padding: 10px 0;
    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: color 0.3s ease, transform 0.2s ease;
    padding: 8px 12px;
    border-radius: 8px;
    min-width: 60px;
}

.nav-item:hover {
    color: var(--primary-blue);
    transform: translateY(-2px);
}

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

.nav-item i {
    font-size: 1.2rem;
    margin-bottom: 4px;
}

.nav-item span {
    font-size: 0.7rem;
    font-weight: 500;
}

/* Footer */
footer {
    text-align: center;
    padding: 20px;
    color: var(--text-secondary);
    font-size: 0.8rem;
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
    margin-top: 40px;
}

/* Memory Game Specific Styles */
.memory-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    max-width: 400px;
    margin: 0 auto;
}

.memory-card {
    aspect-ratio: 1;
    background: var(--primary-blue);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    cursor: pointer;
    transition: all 0.3s ease;
    user-select: none;
}

.memory-card:hover {
    transform: scale(1.05);
}

.memory-card.flipped {
    background: var(--success-green);
    transform: rotateY(180deg);
}

.memory-card.matched {
    background: var(--warning-yellow);
    opacity: 0.7;
}

/* Logic Game Specific Styles */
.logic-puzzle {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.puzzle-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    max-width: 300px;
}

.puzzle-cell {
    aspect-ratio: 1;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.puzzle-cell:hover {
    border-color: var(--primary-blue);
    background: rgba(33, 150, 243, 0.1);
}

.puzzle-cell.selected {
    background: var(--primary-blue);
    color: white;
}

.puzzle-input {
    display: flex;
    gap: 15px;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    background: var(--card-bg);
    border-radius: 15px;
    padding: 20px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    margin: 20px 0;
}

#puzzle-answer {
    padding: 15px 20px;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 1.2rem;
    text-align: center;
    min-width: 180px;
    background: var(--card-bg);
    color: var(--text-primary);
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

#puzzle-answer:focus {
    border-color: var(--primary-blue);
    outline: none;
    box-shadow: 0 4px 15px rgba(33, 150, 243, 0.2);
    transform: translateY(-2px);
}

#puzzle-answer::placeholder {
    color: var(--text-secondary);
    opacity: 0.7;
}

#puzzle-answer:hover {
    border-color: var(--primary-blue);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Speed Game Specific Styles */
.speed-game {
    text-align: center;
}

.reaction-button {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    border: none;
    font-size: 1.2rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    margin: 20px auto;
    display: block;
}

.reaction-button.waiting {
    background: var(--danger-red);
    color: white;
}

.reaction-button.ready {
    background: var(--success-green);
    color: white;
}

.reaction-button:hover {
    transform: scale(1.05);
}

/* Focus Game Specific Styles */
.focus-game {
    text-align: center;
}

.focus-targets {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 10px;
    max-width: 500px;
    margin: 20px auto;
}

.focus-target {
    aspect-ratio: 1;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.focus-target:hover {
    transform: scale(1.05);
}

.focus-target.active {
    background: var(--warning-yellow);
    border-color: var(--warning-yellow);
    animation: pulse 1s infinite;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .app-main {
        padding: 15px;
    }
    
    .header-content h1 {
        font-size: 1.5rem;
    }
    
    .games-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-cards {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .game-header {
        flex-direction: column;
        text-align: center;
    }
    
    .game-stats {
        flex-direction: column;
        gap: 10px;
    }
    
    .results-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .setting-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .setting-input {
        width: 100%;
    }
    
    .memory-grid {
        grid-template-columns: repeat(3, 1fr);
        max-width: 300px;
    }
    
    .focus-targets {
        grid-template-columns: repeat(3, 1fr);
        max-width: 300px;
    }
    
    .reaction-button {
        width: 150px;
        height: 150px;
    }
}

@media (max-width: 480px) {
    .stats-overview {
        grid-template-columns: 1fr;
    }
    
    .stats-cards {
        grid-template-columns: 1fr;
    }
    
    .nav-item span {
        display: none;
    }
    
    .nav-item {
        min-width: 40px;
    }
    
    .memory-grid {
        grid-template-columns: repeat(2, 1fr);
        max-width: 200px;
    }
    
    .focus-targets {
        grid-template-columns: repeat(2, 1fr);
        max-width: 200px;
    }
}

/* Accessibility */
@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) {
    :root {
        --border-color: #555;
        --text-secondary: #ccc;
    }
}

/* Dark mode support (already dark by default) */
@media (prefers-color-scheme: light) {
    /* Keep dark theme as it's part of the cyber aesthetic */
}

/* Canvas styles for charts */
canvas {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
}

/* Loading states */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 200px;
}

.loading::after {
    content: '';
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--primary-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Error states */
.error {
    background: rgba(244, 67, 54, 0.1);
    border: 1px solid var(--danger-red);
    color: var(--danger-red);
    padding: 15px;
    border-radius: 10px;
    text-align: center;
    margin: 20px 0;
}

/* Success states */
.success {
    background: rgba(76, 175, 80, 0.1);
    border: 1px solid var(--success-green);
    color: var(--success-green);
    padding: 15px;
    border-radius: 10px;
    text-align: center;
    margin: 20px 0;
}