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

body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.container {
    background: white;
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    text-align: center;
    max-width: 500px;
}

h1 {
    color: #333;
    margin-bottom: 20px;
    font-size: 2em;
}

.game-info {
    display: flex;
    justify-content: space-around;
    margin-bottom: 20px;
    padding: 15px;
    background: #f5f5f5;
    border-radius: 10px;
}

.score, .high-score {
    font-size: 1.2em;
    font-weight: bold;
    color: #667eea;
}

#gameCanvas {
    border: 3px solid #333;
    border-radius: 10px;
    background: #000;
    display: block;
    margin: 0 auto 20px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.controls {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-bottom: 20px;
}

.btn {
    padding: 12px 24px;
    font-size: 1em;
    font-weight: bold;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.btn:active:not(:disabled) {
    transform: translateY(0);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.instructions {
    text-align: left;
    background: #f9f9f9;
    padding: 20px;
    border-radius: 10px;
    margin-top: 20px;
}

.instructions h3 {
    color: #333;
    margin-bottom: 10px;
}

.instructions ul {
    list-style-position: inside;
    color: #666;
    line-height: 1.8;
}

.instructions li {
    margin-bottom: 5px;
}

@media (max-width: 480px) {
    .container {
        padding: 20px;
    }

    h1 {
        font-size: 1.5em;
    }

    #gameCanvas {
        width: 100%;
        height: auto;
    }

    .controls {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }
}