body {
    margin: 0;
    padding: 0;
    font-family: "Hiragino Kaku Gothic ProN", "Meiryo", sans-serif;
    background-color: #f0f0f0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
}

.container {
    text-align: center;
    width: 90%;
}

.screen {
    background: white;
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

.hidden {
    display: none;
}

h1 {
    font-size: 3rem;
    color: #333;
}

p {
    font-size: 1.5rem;
    color: #666;
}

button {
    font-size: 2rem;
    padding: 20px 50px;
    cursor: pointer;
    background-color: #ff6f61;
    color: white;
    border: none;
    border-radius: 50px;
    transition: 0.3s;
}

button:hover {
    background-color: #e65b50;
    transform: scale(1.05);
}

.image-area img {
    max-width: 100%;
    max-height: 60vh; /* 画面の高さに合わせる */
    border: 5px solid #333;
    border-radius: 10px;
    margin-bottom: 20px;
}