body {
    font-family: 'Montserrat', sans-serif;
    background-color: #ffffff;
    margin: 0;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

.centered {
    text-align: center;
    width: 100%;
    max-width: 400px;
}

h1 {
    font-size: 4rem;
}

.hidden {
    display: none;
}

#logo {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 10;
}

.animated {
    animation: logoAppear 1s cubic-bezier(0.25, 0.1, 0.25, 1) forwards;
}

@keyframes logoAppear {
    0% {
        font-size: 100rem;
        opacity: 0;
    }
    100% {
        font-size: 4rem;
        opacity: 1;
    }
}

#message {
    opacity: 0;
    transition: opacity 1s ease;
    font-size: 2rem;
}

#prompt {
    opacity: 0;
    transition: opacity 1s ease;
}

textarea {
    width: 100%;
    max-width: 600px;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-family: 'Montserrat', sans-serif;
    resize: none;
}

.prompt-sample-container {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}


.prompt-sample {
    cursor: pointer;
    font-size: 1rem;
    padding: 10px;
    margin: 20px;
    background-color: #f5f5f5;
    border-radius: 4px;
    max-width: 400px;
    opacity: 0;
    transition: opacity 1s ease;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

button {
    font-family: 'Montserrat', sans-serif;
    font-size: 1rem;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    background-color: #3f51b5;
    color: white;
    cursor: pointer;
    margin-top: 10px;
}

/* Loading */
.loader {
    border: 16px solid #f3f3f3;
    border-radius: 50%;
    border-top: 16px solid #3498db;
    width: 120px;
    height: 120px;
    animation: spin 2s linear infinite;
  }
  
  @keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }
  
  /* loading-containerを中央に配置するスタイルを追加 */
  #loading-container {
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    height: 100vh;
  }