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

body {
    font-family: Arial, sans-serif;
    background-color: #f0f0f0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.container {
    background-color: white;
    border-radius: 15px;
    padding: 20px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
    text-align: center;
    max-width: 600px;
    width: 100%;
}

h1 {
    color: #333;
    margin-bottom: 20px;
    font-size: 2rem;
}

.game-info {
    display: flex;
    justify-content: space-around;
    margin-bottom: 20px;
    font-size: 1.2rem;
    font-weight: bold;
    color: #555;
    background-color: #f9f9f9;
    padding: 15px;
    border-radius: 10px;
    border: 1px solid #ddd;
}

.game-area {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    gap: 20px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

#gameCanvas {
    border: 2px solid #333;
    border-radius: 10px;
    background-color: #000;
    display: block;
    max-width: 100%;
    height: auto;
}

.next-piece {
    background-color: #f9f9f9;
    padding: 15px;
    border-radius: 10px;
    border: 1px solid #ddd;
    min-width: 150px;
}

.next-piece h3 {
    color: #333;
    margin-bottom: 10px;
    font-size: 1.1rem;
}

#nextCanvas {
    border: 2px solid #333;
    border-radius: 5px;
    background-color: #000;
    display: block;
    margin: 0 auto;
}

.controls {
    margin-bottom: 20px;
}

button {
    background-color: #4CAF50;
    color: white;
    border: none;
    padding: 10px 20px;
    margin: 0 5px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s;
}

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

button:active {
    transform: scale(0.98);
}

#pauseBtn {
    background-color: #ff9800;
}

#pauseBtn:hover {
    background-color: #e68a00;
}

#resetBtn {
    background-color: #f44336;
}

#resetBtn:hover {
    background-color: #da190b;
}

.instructions {
    background-color: #f9f9f9;
    padding: 15px;
    border-radius: 10px;
    border: 1px solid #ddd;
}

.instructions h3 {
    color: #333;
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.instructions p {
    color: #666;
    font-size: 0.9rem;
    line-height: 1.4;
}

/* 响应式设计 */
@media (max-width: 500px) {
    .container {
        padding: 15px;
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    .game-info {
        flex-direction: column;
        gap: 10px;
        font-size: 1rem;
    }
    
    .game-area {
        flex-direction: column;
        align-items: center;
    }
    
    #gameCanvas {
        max-width: 100%;
    }
    
    button {
        padding: 8px 16px;
        font-size: 0.9rem;
        margin: 0 3px;
    }
}