html, body {
    height: 100%;
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: #f5f5f5;
}

#app {
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

#test-screen,
#answer-screen {
    background: white;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
    text-align: center;
    width: 90%;
    max-width: 700px;
}

.hidden {
    display: none;
}

h2 {
    font-size: 28px;
    margin-bottom: 30px;
}

button {
    font-size: 22px;
    padding: 18px 32px;
    margin: 15px;
    border: none;
    border-radius: 10px;
    background-color: #2d6cdf;
    color: white;
    cursor: pointer;
    min-width: 180px;
}

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

.button-group {
    margin-top: 30px;
}

/* Improved image handling */
#answer-image {
    margin-top: 25px;

    /* Allow natural scaling */
    max-width: 100%;
    max-height: 60vh;

    width: auto;
    height: auto;

    object-fit: contain;
}

.structure {
    font-size: 26px;
    letter-spacing: 6px;
    margin-bottom: 30px;
}