.ambient-layer{position:absolute;inset:0;z-index:3;pointer-events:none;overflow:hidden}
.ambient-sprite{position:absolute;background-image:url('ambient-sprites.png');background-repeat:no-repeat;background-size:400% 300%;background-position-y:var(--row,0%);background-position-x:0%;will-change:transform}
.roof-cat{--row:0%;width:58px;height:58px;left:15.5%;top:2.3%;animation:cat-sway 9s ease-in-out infinite}
.roof-cat .ambient-frame,.roof-pigeon .ambient-frame,.vintage-car .ambient-frame{position:absolute;inset:0;background-image:url('ambient-sprites.png');background-repeat:no-repeat;background-size:400% 300%;background-position-y:var(--row,0%)}
.roof-cat .ambient-frame{animation:cat-frames 7s steps(1,end) infinite}
.roof-pigeon{--row:50%;width:52px;height:52px;left:72%;top:.5%;animation:pigeon-trip 29s ease-in-out infinite}
.roof-pigeon .ambient-frame{animation:pigeon-wings .5s steps(3,end) infinite}
.vintage-car{--row:100%;width:132px;height:132px;left:-22%;bottom:-1.1%;animation:car-drive 18s linear forwards;filter:drop-shadow(2px 3px 2px #171a1c63)}
.vintage-car .ambient-frame{animation:car-wheels .45s steps(3,end) infinite}
@keyframes cat-frames{0%,22%{background-position-x:0%}23%,46%{background-position-x:33.333%}47%,70%{background-position-x:66.667%}71%,100%{background-position-x:100%}}
@keyframes cat-sway{0%,100%{transform:translateX(0) rotate(0deg)}50%{transform:translateX(6px) rotate(2deg)}}
@keyframes pigeon-wings{from{background-position-x:0%}to{background-position-x:100%}}
/* Same orientation throughout: exit right and return from left, without flipping. */
@keyframes pigeon-trip{0%,14%{left:72%;top:.5%;opacity:1}20%{left:80%;top:-3%;opacity:1}43%{left:110%;top:-9%;opacity:1}44%,63%{left:-15%;top:-9%;opacity:0}67%{left:-12%;top:-8%;opacity:1}90%,100%{left:72%;top:.5%;opacity:1}}
@keyframes car-drive{from{left:-23%}to{left:108%}}
@keyframes car-wheels{from{background-position-x:0%}to{background-position-x:100%}}
@media(prefers-reduced-motion:reduce){.ambient-sprite,.ambient-frame,.sprite-actor .sprite-art{animation-duration:12s!important}.vintage-car{animation-duration:35s!important}}