body{font-family:Arial,sans-serif;background:#f6f8fb;margin:0;padding:0;display:flex;justify-content:center;align-items:center;min-height:100vh;}
.wrap{width:100%;max-width:960px;padding:18px;box-sizing:border-box;}
header{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;}
button{padding:10px 14px;background:#2b6ef6;color:#fff;border:none;border-radius:8px;cursor:pointer;font-weight:600;}
.board-wrap{display:flex;justify-content:center;}
canvas{border:2px solid #0b2a66;border-radius:8px;background:linear-gradient(#fff,#f7fbff);}
.modal{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,0.4);justify-content:center;align-items:center;}
.modal-content{background:#fff;padding:20px;border-radius:10px;min-width:300px;}
.modal-content button{display:block;width:100%;margin:5px 0;}