body {
    font-family: 'Arial', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #111;
    color: #fff;
    overflow: hidden;
}

.game-container {
    position: relative;
    text-align: center;
}

#game-board {
    background-color: #000;
    border: 2px solid #0f0;
    box-shadow: 0 0 10px #0f0;
}

.game-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    font-size: 1.2em;
}

.controls {
    margin-top: 10px;
    font-size: 0.9em;
    color: #aaa;
}

#game-over {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 3em;
    color: #f00;
    text-shadow: 0 0 10px #ff0000;
    z-index: 10;
}

.hidden {
    display: none;
}

#start-btn {
    margin-top: 20px;
    padding: 10px 20px;
    font-size: 1.2em;
    background-color: #0f0;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    color: #000;
    font-weight: bold;
}

#start-btn:hover {
    background-color: #0c0;
}