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

body {
    background-color: #2c3e50;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    font-family: Arial, sans-serif;
}

.game-container {
    display: flex;
    gap: 20px;
    padding: 20px;
    background-color: #34495e;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.3);
}

.game-area {
    position: relative;
}

#gameCanvas {
    background-color: #2c3e50;
    border: 2px solid #fff;
    border-radius: 5px;
}

.side-panel {
    width: 200px;
    color: #fff;
}

.score-container, .next-piece, .controls {
    background-color: #2c3e50;
    padding: 15px;
    border-radius: 5px;
    margin-bottom: 20px;
}

h3 {
    margin-bottom: 10px;
    color: #3498db;
}

#score {
    font-size: 24px;
    font-weight: bold;
    text-align: center;
}

#nextPieceCanvas {
    background-color: #2c3e50;
    border: 1px solid #fff;
    border-radius: 5px;
    margin: 10px 0;
}

.controls p {
    margin: 5px 0;
    font-size: 14px;
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: #fff;
}

.hidden {
    display: none;
}

button {
    padding: 10px 20px;
    font-size: 18px;
    background-color: #3498db;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #2980b9;
}

#game-over h2 {
    margin-bottom: 20px;
    font-size: 32px;
    color: #e74c3c;
}

#game-over p {
    margin-bottom: 20px;
    font-size: 20px;
}