* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: #1a1a1a;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    font-family: 'Arial', sans-serif;
    color: #fff;
}

.game-container {
    background-color: #2a2a2a;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0,0,0,0.3);
}

.game-header {
    text-align: center;
    margin-bottom: 20px;
}

.game-header h1 {
    color: #4CAF50;
    margin-bottom: 10px;
}

.score {
    font-size: 1.2em;
    color: #FFC107;
}

#game-board {
    display: grid;
    grid-template-columns: repeat(20, 20px);
    grid-template-rows: repeat(20, 20px);
    gap: 1px;
    background-color: #333;
    border: 2px solid #4CAF50;
    margin-bottom: 20px;
}

.snake {
    background-color: #4CAF50;
    border-radius: 2px;
}

.food {
    background-color: #FF5722;
    border-radius: 50%;
}

#start-btn {
    display: block;
    width: 100%;
    padding: 10px;
    font-size: 1.2em;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    margin-bottom: 20px;
}

#start-btn:hover {
    background-color: #45a049;
}

.game-tips {
    text-align: center;
    color: #888;
    font-size: 0.9em;
}

.game-tips p {
    margin: 5px 0;
}