*{box-sizing:border-box}body{margin:0;background:#111;color:#fff;font-family:Arial,sans-serif}.app{max-width:520px;margin:auto;padding:18px}.card{background:#1d1d1d;border-radius:18px;padding:18px;margin:12px 0}h1{text-align:center;margin:8px 0 18px}h2{font-size:19px}.muted{color:#999;font-size:13px}.balance{font-size:30px;font-weight:700;margin-top:12px}button,select,input{width:100%;padding:14px;margin-top:10px;border:0;border-radius:12px;font-size:16px}button{background:#20c997;color:#07120e;font-weight:700;cursor:pointer}.player{padding:10px 0;border-bottom:1px solid #333}.player:last-child{border:0}.online{color:#20c997;font-size:13px}.history-item{padding:8px 0;border-bottom:1px solid #333}