.particle-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    overflow: hidden;
    background: #1a1a1a;
}

.particle-bg .bg {
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, #838383, #301300);
    opacity: 1;
    z-index: 1;
}

.particle-bg #canvas {
    position: absolute;
    display: block;
    width: 100vw;
    height: 100vh;
    z-index: 2;
}

/* 确保wrapper不会阻挡粒子效果的交互 */
.wrapper {
    position: relative;
    z-index: 1;
    pointer-events: none;  /* 让鼠标事件穿透到particle-bg */
}

/* 但wrapper内的实际内容需要可以点击 */
.wrapper * {
    pointer-events: auto;
}