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

html, body {
    width: 100%;
    height: 100%;
    background: #050714;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    touch-action: none;
    user-select: none;
    -webkit-user-select: none;
    font-family: "Noto Sans JP", system-ui, sans-serif;
}

canvas { display: block; box-shadow: 0 0 80px rgba(0,0,0,0.6); }