/* ============================================
   Lightfall 背景容器
   固定在 body 底层，z-index: -1
   ============================================ */

#lightfall-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;  /* 不挡鼠标交互到下层 */
}

#lightfall-bg canvas {
    display: block;
    width: 100% !important;
    height: 100% !important;
}