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24px;font-size:14px;cursor:pointer;border:none;border-radius:6px;background-color:#667eea;color:#fff;font-weight:600;transition:all .3s;margin:5px}button:hover{background-color:#764ba2;transform:translateY(-2px);box-shadow:0 5px 15px #0003}button:active{transform:translateY(0)}#chess-board{width:400px;height:400px;display:grid;grid-template-columns:repeat(8,1fr);grid-template-rows:repeat(8,1fr);border:3px solid #333;gap:0;box-shadow:0 8px 16px #0003}.square{width:50px;height:50px;display:flex;justify-content:center;align-items:center;cursor:pointer;position:relative}.square.light{background-color:#eeeed2}.square.dark{background-color:#769656}.square.highlight{background-color:#baca44;box-shadow:inset 0 0 10px #0000004d}.square.valid-move:after{content:"";width:12px;height:12px;background-color:#0000004d;border-radius:50%;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);z-index:10}.square.valid-move:hover:after{background-color:#00000080}.square.last-move{background-color:#baca44!important;opacity:.7}.piece{width:5em;height:5em;object-fit:contain;cursor:pointer;-webkit-user-select:none;user-select:none;z-index:5;max-width:100%;max-height:100%}.promotion-modal{position:fixed;top:0;left:0;width:100%;height:100%;background-color:#0009;display:flex;justify-content:center;align-items:center;z-index:1000}.promotion-container{background-color:#fff;border-radius:12px;padding:30px;box-shadow:0 10px 40px #0000004d;text-align:center}.promotion-container h2{margin-top:0;margin-bottom:20px;color:#333;font-size:22px}.promotion-options{display:flex;gap:15px;justify-content:center}.promotion-btn{padding:12px 16px;font-size:32px;border:2px solid #769656;background-color:#eeeed2;border-radius:8px;cursor:pointer;transition:all .2s;width:70px;height:70px;display:flex;align-items:center;justify-content:center}.promotion-btn:hover{background-color:#baca44;transform:scale(1.1);box-shadow:0 4px 8px #0003}.promotion-btn:active{background-color:#769656;transform:scale(.95)}.square.in-check{background-color:#e74c3c!important;box-shadow:inset 0 0 10px #e74c3c80}#lobby{width:100%;max-width:500px;display:flex;align-items:center;justify-content:center}.lobby-content{width:100%;padding:0}.lobby-header{text-align:center;margin-bottom:40px}.lobby-header h1{margin:0;font-size:48px;color:#333;letter-spacing:2px;font-weight:700}.lobby-header .subtitle{margin:12px 0 0;font-size:16px;color:#666;font-weight:400}.lobby-form{display:flex;flex-direction:column;gap:30px}.form-section{padding:25px;background:linear-gradient(135deg,#f5f7fa,#c3cfe2);border-radius:12px;border:2px solid #e0e0e0;transition:all .3s 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#667eea66}.btn-primary:active{transform:translateY(0)}.btn-secondary{width:100%;background:linear-gradient(135deg,#764ba2,#667eea);color:#fff;font-size:16px;padding:14px 28px}.btn-secondary:hover{transform:translateY(-2px);box-shadow:0 6px 20px #764ba266}.btn-secondary:active{transform:translateY(0)}.divider{text-align:center;position:relative;color:#999;font-size:14px;font-weight:500}.divider:before{content:"";position:absolute;top:50%;left:0;right:0;height:1px;background:linear-gradient(to right,transparent,#ddd,transparent)}.divider span{position:relative;background:#fff;padding:0 15px}