/* 任务卡29 v4：A-E隔离候选视觉层。 */
.particle-canvas,
body::before { display: none !important; }
html:not([data-ghost-v4-mode="C"]) body::after { display: none !important; }
html[data-ghost-v4-mode="C"] body::after { display: block !important; z-index: 1; }
.ghost-v4-background { position:fixed;inset:0;z-index:0;width:100vw;height:100vh;overflow:hidden;pointer-events:none;contain:strict;background:#120f17; }
.ghost-v4-background canvas { display:block;width:100%;height:100%;pointer-events:none; }
.dot-field-v4 { position:fixed;inset:0;z-index:1;pointer-events:none;overflow:hidden; }
.dot-field-v4 canvas,.dot-field-v4 svg { position:absolute;inset:0;width:100%;height:100%;pointer-events:none; }
main,.site-footer { position:relative; }
main,.site-footer { z-index:2; }