.stair>div,.stair>div:nth-child(n){min-height:0;box-sizing:border-box}
.stair>div:nth-child(1){height:260px}
.stair>div:nth-child(2){height:340px}
.stair>div:nth-child(3){height:420px}
.stair>div:nth-child(4){height:500px}
.stair.js>div{opacity:0;transform:translateY(46px);transition:opacity .7s ease,transform .7s ease}
.stair.js>div.on{opacity:1;transform:none}
@media(max-width:820px){.stair>div,.stair>div:nth-child(n){height:auto}
}
.phil .ph4 i{color:var(--ak);-webkit-text-stroke:0;opacity:1;font-size:56px}