body{font-family:sans-serif;background:#2c3e50;color:#ecf0f1;display:flex;justify-content:center;align-items:center;height:100vh}.game{display:grid;grid-template-columns:repeat(10,30px);grid-template-rows:repeat(10,30px);gap:2px}.cell{width:30px;height:30px;background:#34495e;display:flex;justify-content:center;align-items:center;cursor:pointer;user-select:none;font-weight:700}.cell.revealed{background:#ecf0f1;color:#2c3e50;cursor:default}.cell.flagged{background:#e74c3c}.overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(44,62,80,.9);display:flex;justify-content:center;align-items:center;flex-direction:column}.overlay-content{text-align:center;color:#ecf0f1}.overlay button{margin:10px;padding:10px 20px;font-size:1rem;border:none;border-radius:5px;cursor:pointer}.hidden{display:none}