body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    margin: 20px;
    background-color: #f0f7ff;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

.setup {
    text-align: center;
    margin: 20px 0;
}

.card {
    background: white;
    border-radius: 10px;
    padding: 20px;
    margin: 10px auto;
    max-width: 600px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    cursor: pointer;
    min-height: 200px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.word {
    font-size: 24px;
    color: #2196F3;
    margin-bottom: 10px;
}

.hidden {
    display: none;
}

.phonetic {
    color: #666;
    margin-bottom: 10px;
}

.chinese {
    font-size: 18px;
    color: #4CAF50;
    margin-bottom: 10px;
}

.example {
    color: #333;
    margin-bottom: 10px;
}

.translation {
    color: #666;
    font-style: italic;
}

.controls {
    text-align: center;
    margin: 20px 0;
}

button {
    background: #2196F3;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    margin: 0 5px;
    transition: background-color 0.3s;
}

button:hover {
    background: #1976D2;
}

button:disabled {
    background: #ccc;
    cursor: not-allowed;
}

.progress {
    text-align: center;
    color: #666;
}

@media (max-width: 600px) {
    body {
        padding: 10px;
    }
    
    .card {
        margin: 10px;
    }
    
    .word {
        font-size: 20px;
    }
}