/* 只让视口外的模块淡入上移，首屏保持不透明，避免闪一下 */
.js-anim .rv {
	opacity: 0;
	transform: translateY(16px);
	transition: opacity .45s ease, transform .45s ease;
}
.js-anim .rv.rv-left {
	transform: translateX(-16px);
}
.js-anim .rv.rv-right {
	transform: translateX(16px);
}
.js-anim .rv.rv-in {
	opacity: 1;
	transform: none;
}
@media (prefers-reduced-motion: reduce) {
	.js-anim .rv {
		opacity: 1;
		transform: none;
		transition: none;
	}
}