body {
    margin: 0;
    overflow: hidden;
    width: 100vw;
    height: 100vh;
    /* 深色星空渐变背景 */
    background: linear-gradient(135deg, #0a0e27 0%, #1a1a2e 50%, #16213e 100%);
    background-size: cover;
}

canvas {
    display: block;
}

#canvas_container {
    width: 100%;
    height: 100vh;
}