.board{position:relative;z-index:4;width:min(95vw,95vh * 9 / 8);aspect-ratio:9 / 8;max-width:900px;touch-action:none;-webkit-user-select:none;-ms-user-select:none;user-select:none}.squares,.square-masks{display:grid;grid-template-columns:repeat(9,1fr);grid-template-rows:repeat(8,1fr);width:100%;height:100%}.square-masks{z-index:5;position:absolute;inset:0}.chess-piece{position:absolute;left:0;cursor:pointer}html,body,#root{width:100%;height:100%;margin:0;background-color:#fff;font-family:Zilla Slab,serif;overflow:hidden}body:before{content:"";position:fixed;top:0;left:0;width:100%;height:100%;background:linear-gradient(135deg,transparent 0%,transparent 45%,#dbd6ff 45%,#dbd6ff 46.75%,transparent 46.75%,transparent 100%),linear-gradient(135deg,transparent 0%,transparent 65%,#ccfcff 65%,#ccfcff 66.75%,transparent 66.75%,transparent 100%),linear-gradient(135deg,transparent 0%,transparent 25%,#f7d0ff 25%,#f7d0ff 26.75%,transparent 26.75%,transparent 100%);z-index:0;pointer-events:none}.App{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100%;width:100%;position:relative;color:#28252c;padding-top:70px;padding-bottom:80px;box-sizing:border-box}.header{position:absolute;top:0;left:0;width:100%;display:flex;justify-content:space-between;align-items:center;box-sizing:border-box;padding:15px 30px}.title{position:static;font-size:2.5em;font-style:italic;display:flex;align-items:center}.popup{position:absolute;top:0;left:0;width:100%;height:100%;background-color:#fff9;display:flex;justify-content:center;align-items:center;z-index:100;animation:fadeIn .3s ease-in-out}.popup-content{background-color:#e2e2e2;padding:40px;text-align:center;font-size:1.3em}.popup-content h2{margin-top:0;font-weight:400}.popup-content button{padding:10px 20px;font-size:1em;cursor:pointer;border:none;border-radius:5px;color:#fff;background-color:#39343f}.title>span{font-size:.6em;font-weight:300;color:#6d6d6d;margin-left:30px}.rules-button{padding:10px 20px;font-size:1em;cursor:pointer;border:none;border-radius:5px;color:#fff;background-color:#39343f;font-family:Zilla Slab,serif;z-index:3}.popup-content>h3{font-weight:400}.popup-content>p{font-size:1em}.footer{position:absolute;display:flex;flex-direction:column;gap:20px;bottom:0;left:0;text-align:center;margin-top:60px;padding:30px 20px;z-index:0}.footer-link{color:#000c;text-decoration:none;font-weight:500;padding:8px 12px;border-radius:8px;transition:all .3s ease-out;border:1px solid rgba(0,0,0,.1);position:relative;z-index:0}.footer-link:hover{color:#000;background:#ffffff80;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);text-decoration:none}@media (max-width: 768px){.title{font-size:1.8em}.rules-button{padding:8px 14px;font-size:.95em}.popup-content{width:90%;box-sizing:border-box;font-size:.8em}.footer{padding:20px 12px;gap:12px}}