.scroll-chapter{z-index:1;position:relative}
.scroll-chapter .binder{transform-style:preserve-3d}
.scroll-chapter #spread-threads{overflow:visible;transform-style:preserve-3d}
.scroll-chapter .analysis-page{transform-style:preserve-3d;z-index:3;backface-visibility:visible}
.scroll-chapter .analysis-page>*{backface-visibility:hidden}
.scroll-chapter .analysis-page::before{content:'';position:absolute;inset:0;transform:rotateY(180deg) translateZ(1px);background:linear-gradient(#c6dce799,#e9d5e588),var(--cotton) center/cover;backface-visibility:hidden;border:1px solid #eef5f5}
.aigc-section{z-index:2}
.aigc-section.chapter-busy .film-track{animation-play-state:paused}
@media(max-width:650px){.scroll-chapter .binder{perspective:1000px}}