*{box-sizing:border-box}body{margin:0;padding:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:#f0f0f0}#root{width:100%;min-height:100vh}.game-header{margin-bottom:20px;font-family:Courier New,monospace}.game-controls{display:flex;flex-direction:column;align-items:center;gap:10px}.difficulty-selector select{padding:5px;font-size:14px;border:2px solid #808080;background-color:silver}.game-stats{display:flex;align-items:center;gap:20px;padding:10px;background-color:silver;border:2px inset #c0c0c0}.mine-counter,.timer{background-color:#000;color:red;padding:5px 10px;font-family:Courier New,monospace;font-weight:700;border:2px inset #808080}.new-game-btn{width:40px;height:40px;font-size:20px;border:2px outset #c0c0c0;background-color:silver;cursor:pointer;display:flex;align-items:center;justify-content:center}.new-game-btn:hover{background-color:#d0d0d0}.new-game-btn:active{border:2px inset #c0c0c0}.cell{width:30px;height:30px;border:2px solid #999;background-color:silver;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px;cursor:pointer;-webkit-user-select:none;user-select:none}.cell:hover{background-color:#d0d0d0}.cell.revealed{border:1px solid #777;background-color:#e0e0e0;cursor:default}.cell.revealed:hover{background-color:#e0e0e0}.cell.mine{background-color:#f44}.cell.flagged{background-color:#ff9}.cell.number-1{color:#00f}.cell.number-2{color:green}.cell.number-3{color:red}.cell.number-4{color:navy}.cell.number-5{color:maroon}.cell.number-6{color:teal}.cell.number-7{color:#000}.cell.number-8{color:gray}.game-board{display:inline-block;border:4px solid #808080;background-color:silver;padding:10px}.board-row{display:flex}.app{display:flex;flex-direction:column;align-items:center;padding:20px;background-color:#f0f0f0;min-height:100vh;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif}.app h1{color:#333;margin-bottom:20px;text-shadow:2px 2px 4px rgba(0,0,0,.3)}.game-message{margin-top:20px;padding:15px 30px;border-radius:10px;font-size:18px;font-weight:700;text-align:center}.game-message.win{background-color:#4caf50;color:#fff;border:3px solid #45a049}.game-message.lose{background-color:#f44336;color:#fff;border:3px solid #da190b}