/* Modern Dark Theme with 3D Effects - Memory Master */

/* CSS Variables for consistent theming */
:root {
    /* Dark Color Palette */
    --bg-primary: #0a0a0f;
    --bg-secondary: #1a1a2e;
    --bg-tertiary: #16213e;
    --bg-card: rgba(26, 26, 46, 0.8);
    --bg-glass: rgba(255, 255, 255, 0.05);
    
    /* Accent Colors */
    --accent-primary: #00d4ff;
    --accent-secondary: #ff6b6b;
    --accent-tertiary: #4ecdc4;
    --accent-gold: #ffd700;
    --accent-purple: #9d4edd;
    --accent-green: #06ffa5;
    
    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #b8b8d1;
    --text-muted: #7a7a9a;
    --text-accent: var(--accent-primary);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-tertiary: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-gold: linear-gradient(135deg, #ffd89b 0%, #19547b 100%);
    --gradient-cosmic: radial-gradient(ellipse at center, #1e3c72 0%, #2a5298 100%);
    
    /* Shadows */
    --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.3);
    --shadow-medium: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-strong: 0 16px 64px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px rgba(0, 212, 255, 0.3);
    --shadow-neon: 0 0 20px rgba(157, 78, 221, 0.6);
    
    /* 3D Transform Effects */
    --transform-hover: translateY(-8px) rotateX(5deg) rotateY(5deg);
    --transform-active: translateY(-2px) scale(0.98);
    --transform-float: translateY(-10px);
    
    /* Animation Timings */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-medium: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Exo 2', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    position: relative;
}

/* Cosmic Background */
.cosmic-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: var(--gradient-cosmic);
}

.stars {
    position: absolute;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(2px 2px at 20px 30px, #eee, transparent),
        radial-gradient(2px 2px at 40px 70px, rgba(255,255,255,0.8), transparent),
        radial-gradient(1px 1px at 90px 40px, #fff, transparent),
        radial-gradient(1px 1px at 130px 80px, rgba(255,255,255,0.6), transparent),
        radial-gradient(2px 2px at 160px 30px, #ddd, transparent);
    background-repeat: repeat;
    background-size: 200px 100px;
    animation: twinkle 20s linear infinite;
}

.nebula {
    position: absolute;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(ellipse 400px 300px at 25% 25%, rgba(120, 119, 198, 0.3), transparent),
        radial-gradient(ellipse 300px 200px at 75% 75%, rgba(255, 107, 107, 0.2), transparent),
        radial-gradient(ellipse 500px 400px at 50% 50%, rgba(78, 205, 196, 0.1), transparent);
    animation: nebula-drift 30s ease-in-out infinite alternate;
}

@keyframes twinkle {
    0%, 100% { opacity: 0.8; }
    50% { opacity: 1; }
}

@keyframes nebula-drift {
    0% { transform: translateX(-20px) translateY(-10px); }
    100% { transform: translateX(20px) translateY(10px); }
}

/* Interactive Background Effects */
.interactive-stars {
    position: absolute;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 2;
}

.interactive-star {
    position: absolute;
    width: 4px;
    height: 4px;
    background: radial-gradient(circle, rgba(0, 212, 255, 0.8) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    animation: star-twinkle 2s ease-in-out infinite alternate;
}

.interactive-star.following {
    background: radial-gradient(circle, rgba(255, 215, 0, 0.9) 0%, rgba(0, 212, 255, 0.6) 50%, transparent 70%);
    width: 6px;
    height: 6px;
    box-shadow: 0 0 10px rgba(255, 215, 0, 0.5);
}

@keyframes star-twinkle {
    0% { opacity: 0.3; transform: scale(1); }
    100% { opacity: 1; transform: scale(1.2); }
}

.mouse-trail {
    position: absolute;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

.trail-particle {
    position: absolute;
    width: 3px;
    height: 3px;
    background: radial-gradient(circle, rgba(157, 78, 221, 0.8) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    animation: trail-fade 1s ease-out forwards;
}

@keyframes trail-fade {
    0% {
        opacity: 1;
        transform: scale(1);
    }
    100% {
        opacity: 0;
        transform: scale(0.3);
    }
}

.constellation-line {
    position: absolute;
    height: 1px;
    background: linear-gradient(90deg, 
        transparent 0%,
        rgba(0, 212, 255, 0.3) 50%,
        transparent 100%);
    pointer-events: none;
    animation: line-glow 2s ease-in-out infinite alternate;
    transform-origin: left center;
}

@keyframes line-glow {
    0% { opacity: 0.2; }
    100% { opacity: 0.6; }
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    position: relative;
    z-index: 1;
}

/* Header */
.header {
    position: relative;
    padding: var(--spacing-xl) 0;
    margin-bottom: var(--spacing-xl);
    border-radius: var(--radius-xl);
    overflow: hidden;
    backdrop-filter: blur(30px);
    background: linear-gradient(135deg, 
        rgba(26, 26, 46, 0.9) 0%,
        rgba(22, 33, 62, 0.8) 50%,
        rgba(16, 21, 46, 0.9) 100%);
    border: 2px solid rgba(255, 255, 255, 0.1);
    box-shadow: 
        var(--shadow-strong),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    transform: perspective(1000px) rotateX(2deg);
    transition: all var(--transition-slow);
}

.header:hover {
    transform: perspective(1000px) rotateX(0deg) translateY(-5px);
    box-shadow: 
        0 20px 80px rgba(0, 0, 0, 0.6),
        0 0 50px rgba(0, 212, 255, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.header-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
}

.header-particles {
    position: absolute;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(1px 1px at 20% 30%, rgba(0, 212, 255, 0.8), transparent),
        radial-gradient(1px 1px at 40% 70%, rgba(157, 78, 221, 0.6), transparent),
        radial-gradient(1px 1px at 90% 40%, rgba(255, 107, 107, 0.7), transparent),
        radial-gradient(1px 1px at 60% 80%, rgba(78, 205, 196, 0.5), transparent);
    background-size: 150px 100px;
    animation: float-particles 20s linear infinite;
}

.header-glow {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(ellipse at center, 
        rgba(0, 212, 255, 0.15) 0%,
        rgba(157, 78, 221, 0.1) 30%,
        transparent 70%);
    animation: rotate-glow 30s linear infinite;
}

@keyframes float-particles {
    0% { transform: translateX(0) translateY(0); }
    33% { transform: translateX(30px) translateY(-20px); }
    66% { transform: translateX(-20px) translateY(10px); }
    100% { transform: translateX(0) translateY(0); }
}

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

.header-content {
    position: relative;
    z-index: 2;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 var(--spacing-lg);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.logo-container {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-icon {
    font-size: 4rem;
    position: relative;
    z-index: 2;
    animation: brain-pulse 3s ease-in-out infinite;
    filter: drop-shadow(0 0 20px rgba(0, 212, 255, 0.8));
}

.logo-pulse {
    position: absolute;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: radial-gradient(circle, 
        rgba(0, 212, 255, 0.3) 0%,
        rgba(157, 78, 221, 0.2) 50%,
        transparent 70%);
    animation: pulse-ring 2s ease-in-out infinite;
    z-index: 1;
}

@keyframes brain-pulse {
    0%, 100% { 
        transform: scale(1) rotate(0deg);
        filter: drop-shadow(0 0 20px rgba(0, 212, 255, 0.8));
    }
    50% { 
        transform: scale(1.1) rotate(5deg);
        filter: drop-shadow(0 0 30px rgba(0, 212, 255, 1));
    }
}

@keyframes pulse-ring {
    0% {
        transform: scale(0.8);
        opacity: 1;
    }
    100% {
        transform: scale(1.5);
        opacity: 0;
    }
}

.logo-text-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.logo-text {
    font-family: 'Orbitron', monospace;
    font-size: 3rem;
    font-weight: 900;
    background: linear-gradient(135deg, 
        #00d4ff 0%,
        #9d4edd 30%,
        #ff6b6b 60%,
        #4ecdc4 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 40px rgba(0, 212, 255, 0.5);
    animation: text-shimmer 4s ease-in-out infinite;
    line-height: 1;
}

.logo-subtitle {
    font-family: 'Exo 2', sans-serif;
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 300;
    letter-spacing: 2px;
    text-transform: uppercase;
    opacity: 0.8;
    margin-left: 2px;
}

@keyframes text-shimmer {
    0%, 100% {
        background-position: 0% 50%;
        text-shadow: 0 0 40px rgba(0, 212, 255, 0.5);
    }
    50% {
        background-position: 100% 50%;
        text-shadow: 0 0 60px rgba(157, 78, 221, 0.8);
    }
}

.header-stats {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.score-display {
    display: flex;
    gap: var(--spacing-md);
}

.score-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(15px);
    transition: all var(--transition-medium);
    position: relative;
    overflow: hidden;
}

.score-item::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 var(--transition-slow);
}

.score-item:hover::before {
    left: 100%;
}

.score-item:hover {
    transform: translateY(-3px) scale(1.05);
    border-color: var(--accent-primary);
    box-shadow: 0 8px 25px rgba(0, 212, 255, 0.3);
}

.current-score:hover {
    box-shadow: 0 8px 25px rgba(255, 215, 0, 0.4);
    border-color: var(--accent-gold);
}

.best-score:hover {
    box-shadow: 0 8px 25px rgba(255, 107, 107, 0.4);
    border-color: var(--accent-secondary);
}

.score-icon {
    font-size: 1.8rem;
    filter: drop-shadow(0 0 8px rgba(255, 255, 255, 0.3));
}

.score-info {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.score-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 500;
    margin-bottom: 2px;
}

.score-value {
    font-family: 'Orbitron', monospace;
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
}

.player-level {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: rgba(157, 78, 221, 0.1);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(157, 78, 221, 0.3);
    backdrop-filter: blur(15px);
    transition: all var(--transition-medium);
}

.player-level:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 8px 25px rgba(157, 78, 221, 0.4);
    border-color: var(--accent-purple);
}

.level-icon {
    font-size: 1.8rem;
    filter: drop-shadow(0 0 8px rgba(157, 78, 221, 0.5));
}

.level-info {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.level-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 500;
    margin-bottom: 2px;
}

.level-value {
    font-family: 'Orbitron', monospace;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent-purple);
    text-shadow: 0 0 10px rgba(157, 78, 221, 0.5);
}

.header-controls {
    display: flex;
    gap: var(--spacing-sm);
}

.control-btn {
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.control-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left var(--transition-medium);
}

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

.control-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent-primary);
    transform: translateY(-2px) scale(1.1);
    box-shadow: 0 8px 20px rgba(0, 212, 255, 0.3);
}

.control-icon {
    font-size: 1.2rem;
    filter: drop-shadow(0 0 5px rgba(255, 255, 255, 0.3));
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    z-index: 1000;
    animation: fadeIn 0.3s ease-out;
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: 0;
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow: hidden;
    border: 2px solid rgba(255, 255, 255, 0.1);
    box-shadow: var(--shadow-strong);
    transform: scale(0.9);
    animation: modalSlideIn 0.3s ease-out forwards;
}

@keyframes modalSlideIn {
    to {
        transform: scale(1);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    background: var(--gradient-primary);
    color: white;
}

.modal-header h2 {
    font-family: 'Orbitron', monospace;
    font-size: 1.5rem;
    margin: 0;
}

.close-btn {
    background: none;
    border: none;
    color: white;
    font-size: 2rem;
    cursor: pointer;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all var(--transition-fast);
}

.close-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(90deg);
}

.modal-body {
    padding: var(--spacing-lg);
}

/* Settings Styles */
.setting-group {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.setting-group:last-child {
    border-bottom: none;
}

.setting-label {
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 500;
}

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

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

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.2);
    transition: var(--transition-fast);
    border-radius: 30px;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.toggle-slider::before {
    position: absolute;
    content: "";
    height: 22px;
    width: 22px;
    left: 3px;
    bottom: 3px;
    background: white;
    transition: var(--transition-fast);
    border-radius: 50%;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
}

input:checked + .toggle-slider {
    background: var(--gradient-primary);
    border-color: var(--accent-primary);
}

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

.slider-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

#animationSpeed {
    width: 120px;
    height: 8px;
    background: rgba(255, 255, 255, 0.2);
    outline: none;
    border-radius: 4px;
    -webkit-appearance: none;
}

#animationSpeed::-webkit-slider-thumb {
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--gradient-primary);
    cursor: pointer;
    border-radius: 50%;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
}

.slider-value {
    font-family: 'Orbitron', monospace;
    font-weight: 600;
    color: var(--accent-primary);
    min-width: 30px;
}

.theme-select {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-glass);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.9rem;
    cursor: pointer;
    backdrop-filter: blur(10px);
}

.theme-select option {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

/* Achievements Styles */
.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.achievement-card {
    background: var(--bg-glass);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    transition: all var(--transition-medium);
    position: relative;
    overflow: hidden;
}

.achievement-card.unlocked {
    border-color: var(--accent-gold);
    box-shadow: 0 0 20px rgba(255, 215, 0, 0.3);
}

.achievement-card.unlocked::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, 
        rgba(255, 215, 0, 0.1) 0%,
        transparent 50%,
        rgba(255, 215, 0, 0.1) 100%);
    animation: achievement-shine 2s ease-in-out infinite;
}

@keyframes achievement-shine {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 0.7; }
}

.achievement-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    filter: grayscale(100%);
    transition: filter var(--transition-medium);
}

.achievement-card.unlocked .achievement-icon {
    filter: grayscale(0%);
    animation: achievement-bounce 0.6s ease-out;
}

@keyframes achievement-bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

.achievement-title {
    font-family: 'Orbitron', monospace;
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.achievement-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

.achievement-progress {
    margin-top: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    height: 6px;
    overflow: hidden;
}

.achievement-progress-bar {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-sm);
    transition: width var(--transition-medium);
}

/* Achievement Notifications */
.achievement-notification {
    position: fixed;
    top: 20px;
    right: -400px;
    z-index: 10000;
    background: var(--gradient-secondary);
    color: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-strong);
    transition: right var(--transition-medium);
    backdrop-filter: blur(20px);
    border: 2px solid rgba(255, 255, 255, 0.2);
    max-width: 350px;
}

.achievement-notification.show {
    right: 20px;
}

.achievement-notification-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.achievement-notification-icon {
    font-size: 2.5rem;
    animation: achievement-bounce 0.6s ease-out;
}

.achievement-notification-text {
    flex: 1;
}

.achievement-notification-title {
    font-family: 'Orbitron', monospace;
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-xs);
    opacity: 0.9;
}

.achievement-notification-name {
    font-size: 1.1rem;
    font-weight: 700;
}

/* Main Content */
.main-content {
    min-height: 70vh;
    position: relative;
}

.screen {
    display: none;
    animation: fadeIn 0.6s ease-out;
}

.screen.active {
    display: block;
}

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

/* Welcome Section */
.welcome-section {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-xl) 0;
}

.welcome-title {
    font-family: 'Orbitron', monospace;
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 40px rgba(102, 126, 234, 0.3);
    animation: title-glow 3s ease-in-out infinite alternate;
}

@keyframes title-glow {
    0% { text-shadow: 0 0 40px rgba(102, 126, 234, 0.3); }
    100% { text-shadow: 0 0 60px rgba(102, 126, 234, 0.6); }
}

.welcome-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Difficulty Selector */
.difficulty-selector {
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.difficulty-selector h3 {
    font-family: 'Orbitron', monospace;
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
    color: var(--text-accent);
}

.difficulty-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.difficulty-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--bg-glass);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-medium);
    backdrop-filter: blur(20px);
    min-width: 180px;
    transform: perspective(1000px) rotateY(-10deg);
    position: relative;
    overflow: hidden;
}

.difficulty-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 var(--transition-slow);
}

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

.difficulty-btn:hover {
    transform: perspective(1000px) rotateY(0deg) translateY(-5px) scale(1.05);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-glow);
}

.difficulty-btn.active {
    background: var(--gradient-tertiary);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-glow);
    transform: perspective(1000px) rotateY(0deg) translateY(-3px);
}

.difficulty-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-xs);
}

.difficulty-name {
    font-family: 'Orbitron', monospace;
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.difficulty-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    opacity: 0.8;
}

/* Games Grid */
.games-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
    padding: var(--spacing-lg) 0;
}

.game-card {
    position: relative;
    background: var(--bg-glass);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    cursor: pointer;
    transition: all var(--transition-medium);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transform: perspective(1000px) rotateX(5deg) rotateY(-5deg);
    overflow: hidden;
}

.card-glow {
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    z-index: -1;
    opacity: 0;
    transition: opacity var(--transition-medium);
}

.game-card:hover {
    transform: perspective(1000px) rotateX(0deg) rotateY(0deg) translateY(-10px) scale(1.02);
    box-shadow: var(--shadow-strong);
}

.game-card:hover .card-glow {
    opacity: 1;
    animation: glow-pulse 2s ease-in-out infinite alternate;
}

@keyframes glow-pulse {
    0% { opacity: 0.5; }
    100% { opacity: 1; }
}

.game-card:active {
    transform: perspective(1000px) rotateX(2deg) rotateY(-2deg) translateY(-5px) scale(0.98);
}

.card-content {
    position: relative;
    z-index: 1;
}

.game-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    display: block;
    text-align: center;
    filter: drop-shadow(0 0 10px rgba(255, 255, 255, 0.3));
}

.game-title {
    font-family: 'Orbitron', monospace;
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    text-align: center;
}

.game-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    text-align: center;
    line-height: 1.5;
}

.card-stats {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Game Play Screen */
.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    background: var(--bg-glass);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: var(--shadow-soft);
}

.back-btn, .pause-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-glass);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    backdrop-filter: blur(10px);
}

.back-btn:hover, .pause-btn:hover {
    background: var(--accent-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

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

#currentGameTitle {
    font-family: 'Orbitron', monospace;
    font-size: 1.8rem;
    margin-bottom: var(--spacing-xs);
    background: var(--gradient-tertiary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.game-stats {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    font-family: 'Orbitron', monospace;
    color: var(--text-secondary);
}

/* Game Area */
.game-area {
    min-height: 60vh;
    background: var(--bg-glass);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: var(--shadow-medium);
    position: relative;
    overflow: hidden;
}

.game-area::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(0, 212, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(157, 78, 221, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 80%, rgba(255, 107, 107, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

/* Game Over Screen */
.game-over-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
    padding: var(--spacing-xl);
    background: var(--bg-glass);
    border-radius: var(--radius-xl);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: var(--shadow-strong);
    transform: perspective(1000px) rotateX(5deg);
    animation: game-over-entrance 0.8s ease-out;
}

@keyframes game-over-entrance {
    0% {
        opacity: 0;
        transform: perspective(1000px) rotateX(15deg) translateY(50px);
    }
    100% {
        opacity: 1;
        transform: perspective(1000px) rotateX(5deg) translateY(0);
    }
}

.result-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    animation: bounce 1s ease-in-out infinite alternate;
}

@keyframes bounce {
    0% { transform: translateY(0); }
    100% { transform: translateY(-10px); }
}

.result-title {
    font-family: 'Orbitron', monospace;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    background: var(--gradient-secondary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.result-message {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.final-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.stat-item {
    padding: var(--spacing-md);
    background: var(--bg-glass);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    transform: perspective(500px) rotateY(5deg);
    transition: all var(--transition-medium);
}

.stat-item:hover {
    transform: perspective(500px) rotateY(0deg) translateZ(10px);
    box-shadow: var(--shadow-glow);
}

.stat-label {
    display: block;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.stat-value {
    display: block;
    font-family: 'Orbitron', monospace;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-primary);
    text-shadow: 0 0 10px rgba(0, 212, 255, 0.5);
}

.result-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.action-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-medium);
    backdrop-filter: blur(10px);
    transform: perspective(500px) rotateY(-5deg);
    position: relative;
    overflow: hidden;
}

.action-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left var(--transition-slow);
}

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

.action-btn:hover {
    transform: perspective(500px) rotateY(0deg) translateY(-3px) scale(1.05);
}

.action-btn:active {
    transform: perspective(500px) rotateY(0deg) translateY(-1px) scale(0.98);
}

.action-btn.primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-medium);
}

.action-btn.primary:hover {
    box-shadow: var(--shadow-glow);
}

.action-btn.secondary {
    background: var(--gradient-secondary);
    color: white;
    box-shadow: var(--shadow-medium);
}

.action-btn.secondary:hover {
    box-shadow: 0 0 30px rgba(255, 107, 107, 0.4);
}

.action-btn.tertiary {
    background: var(--bg-glass);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-soft);
}

.action-btn.tertiary:hover {
    background: var(--accent-tertiary);
    box-shadow: 0 0 30px rgba(78, 205, 196, 0.4);
}

/* Footer */
.footer {
    position: relative;
    margin-top: var(--spacing-xl);
    background: linear-gradient(135deg, 
        var(--bg-secondary) 0%,
        var(--bg-tertiary) 50%,
        var(--bg-secondary) 100%);
    overflow: hidden;
}

.footer-wave {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 60px;
    overflow: hidden;
    z-index: 1;
}

.footer-wave svg {
    width: 100%;
    height: 100%;
    animation: wave-flow 8s ease-in-out infinite;
}

@keyframes wave-flow {
    0%, 100% { transform: translateX(0); }
    50% { transform: translateX(-20px); }
}

.footer-content {
    position: relative;
    z-index: 2;
    padding: calc(var(--spacing-xl) + 60px) var(--spacing-lg) var(--spacing-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.footer-main {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.footer-logo-icon {
    font-size: 2rem;
    filter: drop-shadow(0 0 10px rgba(0, 212, 255, 0.5));
    animation: pulse-glow 3s ease-in-out infinite alternate;
}

.footer-logo-text {
    font-family: 'Orbitron', monospace;
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-tertiary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-tagline {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.5;
    max-width: 300px;
    font-style: italic;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.footer-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.footer-section-title {
    font-family: 'Orbitron', monospace;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    position: relative;
}

.footer-section-title::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 30px;
    height: 2px;
    background: var(--gradient-primary);
    border-radius: 1px;
}

.footer-link-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.footer-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: all var(--transition-fast);
    padding: var(--spacing-xs) 0;
    position: relative;
}

.footer-link:hover {
    color: var(--accent-primary);
    padding-left: var(--spacing-sm);
    transform: translateX(5px);
}

.footer-link::before {
    content: '▶';
    position: absolute;
    left: -15px;
    opacity: 0;
    transition: all var(--transition-fast);
    font-size: 0.7rem;
    color: var(--accent-primary);
}

.footer-link:hover::before {
    opacity: 1;
    left: -10px;
}

.social-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.social-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-secondary);
    text-decoration: none;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all var(--transition-medium);
    backdrop-filter: blur(10px);
}

.social-link:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent-primary);
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 5px 15px rgba(0, 212, 255, 0.2);
}

.social-link.linkedin:hover {
    box-shadow: 0 5px 15px rgba(0, 119, 181, 0.3);
    border-color: #0077b5;
}

.social-icon {
    font-size: 1.2rem;
    filter: drop-shadow(0 0 5px rgba(255, 255, 255, 0.3));
}

.social-text {
    font-weight: 500;
    font-size: 0.9rem;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-bottom-left {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.footer-bottom-left p {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin: 0;
}

.footer-version {
    font-family: 'Orbitron', monospace;
    color: var(--accent-primary);
    font-size: 0.75rem;
    opacity: 0.8;
}

.footer-bottom-right {
    display: flex;
    align-items: center;
}

.developer-credit {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.9rem;
}

.credit-text {
    color: var(--text-secondary);
}

.credit-heart {
    color: #ff6b6b;
    animation: heartbeat 2s ease-in-out infinite;
    font-size: 1rem;
}

@keyframes heartbeat {
    0%, 50%, 100% { transform: scale(1); }
    25%, 75% { transform: scale(1.1); }
}

.developer-name {
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: 600;
    font-family: 'Orbitron', monospace;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid rgba(0, 212, 255, 0.2);
    transition: all var(--transition-fast);
}

.developer-name:hover {
    background: rgba(0, 212, 255, 0.2);
    border-color: var(--accent-primary);
    transform: translateY(-1px);
    box-shadow: 0 3px 10px rgba(0, 212, 255, 0.3);
}

/* Game-Specific Styles */
.memory-grid {
    display: grid;
    gap: var(--spacing-sm);
    justify-content: center;
    perspective: 1000px;
}

.memory-card {
    aspect-ratio: 1;
    background: var(--bg-glass);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-medium);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    transform: perspective(500px) rotateY(0deg);
    position: relative;
    overflow: hidden;
}

.memory-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.memory-card:hover {
    transform: perspective(500px) rotateY(10deg) translateZ(20px);
    box-shadow: var(--shadow-glow);
}

.memory-card:hover::before {
    opacity: 0.1;
}

.memory-card.flipped {
    transform: perspective(500px) rotateY(180deg);
    background: var(--gradient-tertiary);
    border-color: var(--accent-primary);
}

.memory-card.matched {
    background: var(--gradient-secondary);
    border-color: var(--accent-green);
    animation: match-celebration 0.6s ease-out;
}

@keyframes match-celebration {
    0% { transform: perspective(500px) rotateY(180deg) scale(1); }
    50% { transform: perspective(500px) rotateY(180deg) scale(1.1); }
    100% { transform: perspective(500px) rotateY(180deg) scale(1); }
}

.sequence-button {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-medium);
    transform: perspective(500px) rotateX(10deg);
    position: relative;
    overflow: hidden;
}

.sequence-button::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: all var(--transition-fast);
}

.sequence-button:hover {
    transform: perspective(500px) rotateX(0deg) translateY(-5px) scale(1.1);
}

.sequence-button:active::before {
    width: 100%;
    height: 100%;
}

.sequence-button.active {
    animation: sequence-pulse 0.3s ease-out;
}

@keyframes sequence-pulse {
    0% { transform: perspective(500px) rotateX(10deg) scale(1); }
    50% { transform: perspective(500px) rotateX(0deg) scale(1.2); }
    100% { transform: perspective(500px) rotateX(10deg) scale(1); }
}

/* Responsive Design */
@media (max-width: 1024px) {
    .games-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: var(--spacing-md);
    }
    
    .difficulty-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .difficulty-btn {
        min-width: 250px;
    }
    
    .welcome-title {
        font-size: 2.5rem;
    }

    .footer-main {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
        text-align: center;
    }

    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 768px) {
    .header {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
    
    .logo-text {
        font-size: 2rem;
    }
    
    .games-grid {
        grid-template-columns: 1fr;
    }
    
    .game-header {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .game-stats {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .result-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .action-btn {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
    
    .final-stats {
        grid-template-columns: 1fr;
    }
    
    .welcome-title {
        font-size: 2rem;
    }

    .footer-links {
        grid-template-columns: 1fr;
        text-align: center;
    }

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

    .header-content {
        flex-direction: column;
        gap: var(--spacing-lg);
    }

    .header-stats {
        flex-direction: column;
        align-items: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .logo-text {
        font-size: 1.5rem;
    }
    
    .welcome-title {
        font-size: 1.8rem;
    }
    
    .game-card {
        padding: var(--spacing-md);
    }
    
    .game-area {
        padding: var(--spacing-md);
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .stars, .nebula {
        animation: none;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    :root {
        --bg-primary: #000000;
        --bg-secondary: #1a1a1a;
        --text-primary: #ffffff;
        --text-secondary: #cccccc;
        --accent-primary: #00ffff;
    }
}

/* Focus styles for accessibility */
button:focus,
.game-card:focus,
.difficulty-btn:focus,
.memory-card:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .cosmic-bg,
    .header,
    .footer {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
}