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

body {
    background: #1a1a2e;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    overflow: hidden;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

#game-container {
    position: relative;
    touch-action: none;
}

#gameCanvas {
    display: block;
    background: #16213e;
    border-radius: 8px;
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.5);
}

#mute-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    width: 44px;
    height: 44px;
    font-size: 20px;
    background: rgba(0, 0, 0, 0.5);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    color: white;
    transition: background 0.2s, transform 0.1s;
    z-index: 10;
}

#mute-btn:hover {
    background: rgba(0, 0, 0, 0.7);
}

#mute-btn:active {
    transform: scale(0.95);
}

@media (max-width: 800px) {
    body {
        align-items: flex-start;
        padding-top: 10px;
    }

    #gameCanvas {
        border-radius: 0;
    }
}