body {
    font-family: Arial, sans-serif;
    text-align: center;
    margin: 0;
    padding: 20px;
    background-color: #f0f0f0;
}

#gameContainer {
    position: relative;
    width: 400px;
    height: 400px;
    margin: 0 auto;
    background-color: #fff;
    border: 2px solid #333;
    overflow: hidden;
}

#player {
    position: absolute;
    width: 30px;
    height: 30px;
    background-color: blue;
    border-radius: 50%;
    left: 185px;
    top: 185px;
    z-index: 10;
}

.obstacle {
    position: absolute;
    width: 30px;
    height: 30px;
    background-color: red;
    border-radius: 50%;
}

#timer {
    font-size: 24px;
    margin: 20px 0;
}

#startBtn {
    padding: 10px 20px;
    font-size: 18px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    margin-right: 10px;
}

#startBtn:hover {
    background-color: #45a049;
}

#showLeaderboardBtn {
    padding: 10px 20px;
    font-size: 18px;
    background-color: #2196F3;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

#showLeaderboardBtn:hover {
    background-color: #0b7dda;
}

#gameOverMessage,
#successMessage {
    display: none;
    font-size: 24px;
    margin: 20px 0;
}

#gameOverMessage {
    color: red;
}

#successMessage {
    color: green;
}

#instructions {
    margin: 20px 0;
    color: #666;
}

#difficulty {
    font-size: 18px;
    margin: 10px 0;
    color: #9c27b0;
}

#nameInputContainer {
    display: none;
    margin: 20px 0;
}

#playerName {
    padding: 8px;
    font-size: 16px;
    border: 1px solid #ccc;
    border-radius: 4px;
    margin-right: 10px;
}

#submitScoreBtn {
    padding: 8px 15px;
    font-size: 16px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

#leaderboardContainer {
    display: none;
    max-width: 400px;
    margin: 20px auto;
    padding: 15px;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

#leaderboardTitle {
    font-size: 22px;
    color: #333;
    margin-bottom: 15px;
}

.leaderboard-entry {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid #eee;
}

.leaderboard-entry:last-child {
    border-bottom: none;
}

.rank {
    font-weight: bold;
    width: 30px;
}

.name {
    flex-grow: 1;
    text-align: left;
    padding: 0 10px;
}

.score {
    width: 80px;
    font-weight: bold;
}

.top-rank {
    background-color: #ffd700;
    color: #333;
}

.second-rank {
    background-color: #c0c0c0;
    color: #333;
}

.third-rank {
    background-color: #cd7f32;
    color: #333;
}

#closeLeaderboardBtn {
    margin-top: 15px;
    padding: 8px 15px;
    background-color: #f44336;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

#newRecordMessage {
    display: none;
    margin: 15px 0;
    font-size: 20px;
    color: #ff9800;
    font-weight: bold;
}

#overlay {
    position: fixed;
    display: none;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 100;
}