body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #f4f7f9;
    color: #333;
}

#game-container {
    text-align: center;
    background-color: white;
    padding: 2rem 3rem;
    border-radius: 12px;
    box-shadow: 0 8px 16px rgba(0,0,0,0.1);
    width: 90%;
    max-width: 400px;
}

h1 {
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

p {
    color: #7f8c8d;
    margin-bottom: 2rem;
}

#letter-display {
    margin-bottom: 2rem;
}

#current-letter {
    font-size: 6rem;
    font-weight: bold;
    margin: 0;
    color: #3498db;
}

#answer-input {
    width: 6rem;
    height: 6rem;
    font-size: 4rem;
    text-align: center;
    border: 2px solid #bdc3c7;
    border-radius: 8px;
    outline: none;
    text-transform: uppercase;
    font-family: inherit;
    color: #333;
    transition: border-color 0.3s;
}

#answer-input:focus {
    border-color: #3498db;
}

#feedback {
    margin-top: 1.5rem;
    font-size: 1.5rem;
    height: 2.2rem; /* Reserve space to prevent layout shift */
    font-weight: bold;
    transition: color 0.3s;
}

.correct {
    color: #2ecc71;
}

.wrong {
    color: #e74c3c;
}