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

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

.game-container {
    display: flex;
    gap: 20px;
    padding: 20px;
    background-color: #2a2a2a;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
}

.game-info {
    width: 200px;
    padding: 20px;
}

h1 {
    font-size: 24px;
    margin-bottom: 20px;
    color: #00ff88;
}

.score-board {
    margin-bottom: 20px;
    padding: 10px;
    background-color: #333;
    border-radius: 5px;
}

.next-piece {
    margin-bottom: 20px;
}

#next {
    width: 120px;
    height: 120px;
    background-color: #333;
    margin-top: 10px;
    border: 2px solid #444;
}

#game-board {
    width: 300px;
    height: 600px;
    background-color: #000;
    display: grid;
    grid-template-columns: repeat(10, 1fr);
    grid-template-rows: repeat(20, 1fr);
    gap: 1px;
    padding: 10px;
    border-radius: 5px;
    border: 2px solid #444;
}

.cell {
    background-color: #1a1a1a;
    border-radius: 2px;
}

.cell.filled {
    background-color: #00ff88;
    box-shadow: 0 0 5px #00ff88;
}

.controls {
    margin-bottom: 20px;
}

.controls ul {
    list-style: none;
    padding-left: 10px;
}

.controls li {
    margin: 5px 0;
    font-size: 14px;
    color: #ccc;
}

#start-btn {
    width: 100%;
    padding: 10px;
    background-color: #00ff88;
    border: none;
    border-radius: 5px;
    color: #000;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s;
}

#start-btn:hover {
    background-color: #00cc6a;
}