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

body {
    background: #000;
    font-family: 'Courier New', monospace;
    color: #0f0;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    background: linear-gradient(135deg, #000 0%, #001a00 50%, #000 100%);
    touch-action: manipulation;
    -webkit-user-select: none;
    user-select: none;
}

.container {
    max-width: 800px;
    width: 100%;
}

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

.header h1 {
    font-size: 28px;
    margin-bottom: 20px;
    text-shadow: 0 0 20px #0f0;
    letter-spacing: 4px;
}

.stats {
    display: flex;
    justify-content: center;
    gap: 30px;
    padding: 15px;
    background: rgba(0, 0, 0, 0.8);
    border: 2px solid #0f0;
    border-radius: 8px;
    box-shadow: 0 0 20px rgba(0, 255, 0, 0.3);
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
}

.stat-item .label {
    font-size: 11px;
    opacity: 0.7;
}

.stat-item span:last-child {
    font-size: 20px;
    font-weight: bold;
    text-shadow: 0 0 10px #0f0;
}

.game-board {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
    margin-bottom: 30px;
    padding: 20px;
    background: rgba(0, 0, 0, 0.6);
    border: 2px solid #0f0;
    border-radius: 8px;
    box-shadow: 0 0 30px rgba(0, 255, 0, 0.4);
}

.card {
    aspect-ratio: 1;
    background: #000;
    border: 2px solid #0f0;
    border-radius: 8px;
    cursor: pointer;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.4s, box-shadow 0.3s;
    box-shadow: 0 0 10px rgba(0, 255, 0, 0.2);
    touch-action: manipulation;
}

.card:hover:not(.flipped):not(.matched) {
    box-shadow: 0 0 20px rgba(0, 255, 0, 0.5);
    transform: scale(1.05);
}

.card.flipped {
    transform: rotateY(180deg);
}

.card.matched {
    border-color: #00ff00;
    box-shadow: 0 0 30px rgba(0, 255, 0, 0.8);
    animation: pulse 1s;
}

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

.card-front,
.card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 6px;
}

.card-front {
    background: #000;
    border: 1px solid #0f0;
}

.card-back {
    background: #0f0;
    color: #000;
    font-size: 48px;
    font-weight: bold;
    transform: rotateY(180deg);
    text-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
}

.matrix-pattern {
    width: 80%;
    height: 80%;
    background: linear-gradient(45deg, transparent 30%, #0f0 30%, #0f0 70%, transparent 70%),
                linear-gradient(-45deg, transparent 30%, #0f0 30%, #0f0 70%, transparent 70%);
    opacity: 0.3;
    animation: matrix-flow 3s linear infinite;
}

@keyframes matrix-flow {
    0% { background-position: 0 0; }
    100% { background-position: 20px 20px; }
}

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

button {
    padding: 15px 30px;
    background: #000;
    color: #0f0;
    border: 2px solid #0f0;
    border-radius: 6px;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
    letter-spacing: 1px;
}

button:hover {
    background: #0f0;
    color: #000;
    box-shadow: 0 0 20px #0f0;
    transform: translateY(-2px);
}

.overlay {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0, 0, 0, 0.95);
    border: 3px solid #0f0;
    border-radius: 12px;
    padding: 40px;
    text-align: center;
    z-index: 1000;
    box-shadow: 0 0 50px rgba(0, 255, 0, 0.6);
    min-width: 400px;
}

.overlay h2 {
    font-size: 32px;
    margin-bottom: 20px;
    text-shadow: 0 0 20px #0f0;
    letter-spacing: 3px;
}

.win-stats {
    font-size: 18px;
    margin: 20px 0;
    line-height: 1.8;
}

.hidden {
    display: none;
}

/* Responsive design */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    .header h1 {
        font-size: 18px;
        letter-spacing: 2px;
        margin-bottom: 15px;
    }
    
    .stats {
        gap: 10px;
        padding: 10px;
    }
    
    .stat-item .label {
        font-size: 10px;
    }
    
    .stat-item span:last-child {
        font-size: 16px;
    }
    
    .game-board {
        gap: 8px;
        padding: 12px;
    }
    
    .card-back {
        font-size: 32px;
    }
    
    button {
        padding: 12px 20px;
        font-size: 12px;
    }
    
    .overlay {
        min-width: auto;
        max-width: 90%;
        padding: 30px 20px;
    }
    
    .overlay h2 {
        font-size: 22px;
    }
    
    .win-stats {
        font-size: 15px;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 16px;
        letter-spacing: 1px;
    }
    
    .game-board {
        gap: 6px;
        padding: 10px;
    }
    
    .card {
        border-width: 1px;
    }
    
    .card-back {
        font-size: 24px;
    }
    
    button {
        padding: 10px 16px;
        font-size: 11px;
    }
    
    .overlay h2 {
        font-size: 20px;
    }
}