*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background-color:#0f0f23;color:#e0e0e0;overflow:hidden;width:100vw;height:100vh}#game-container{width:100%;height:100%}#ui-layer{display:none}#stats-panel{background:#1a1a2ef2;border-left:2px solid #4a4a6a;padding:20px;height:100%;pointer-events:all;box-shadow:-4px 0 20px #00000080}#stats-panel h2{color:gold;font-size:24px;margin-bottom:20px;text-shadow:0 2px 4px rgba(0,0,0,.5)}.stat-item{display:flex;justify-content:space-between;padding:12px;margin-bottom:10px;background:#ffffff0d;border-radius:6px;font-size:16px;border:1px solid rgba(255,255,255,.1)}.stat-item span:first-child{color:#a0a0c0}.stat-item span:last-child{color:#0f8;font-weight:700}#upgrade-btn{width:100%;padding:14px;margin-top:20px;background:linear-gradient(135deg,#667eea,#764ba2);border:none;border-radius:8px;color:#fff;font-size:16px;font-weight:700;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 15px #667eea66}#upgrade-btn:hover{transform:translateY(-2px);box-shadow:0 6px 20px #667eea99}#upgrade-btn:active{transform:translateY(0)}