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

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: #030508;
    touch-action: none;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
}

#canvas {
    display: block;
    width: 100vw;
    height: 100vh;
    cursor: pointer;
}

#sound-toggle {
    position: fixed;
    top: 15px;
    right: 15px;
    width: 44px;
    height: 44px;
    background: rgba(0, 210, 255, 0.15);
    border: 1px solid rgba(0, 210, 255, 0.4);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    cursor: pointer;
    z-index: 100;
    transition: all 0.2s ease;
}

#sound-toggle:hover {
    background: rgba(0, 210, 255, 0.25);
    border-color: rgba(0, 210, 255, 0.7);
    transform: scale(1.05);
}

#sound-toggle:active {
    transform: scale(0.95);
}