#particles-js{
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    /* 移除 pointer-events: none，让事件可以穿透到下层元素 */
}

/* particles canvas 保持交互能力 */
#particles-js canvas {
    pointer-events: auto;
}