/* 动态印章背景：固定视口层，视差滚动 + 边界换行回收，保证每屏均匀 N 枚 */
#mimosa-stamp-layer {
    position: fixed;
    inset: 0;
    z-index: -2;
    pointer-events: none;
    overflow: hidden;
}

.mimosa-stamp {
    position: absolute;
    pointer-events: none;
    --stamp-rot: 0deg;
    --stamp-dur: 10s;
    animation: mimosa-stamp-float var(--stamp-dur) ease-in-out infinite alternate;
}

.mimosa-stamp img {
    display: block;
    width: 100%;
    height: auto;
}

[data-theme="dark"].mimosa-stamp-invert .mimosa-stamp {
    filter: invert(1);
}

@keyframes mimosa-stamp-float {
    from { transform: translateY(-10px) rotate(var(--stamp-rot)); }
    to   { transform: translateY(10px) rotate(var(--stamp-rot)); }
}