body {
    margin: 0;
    padding: 0;
    font-family: system-ui, sans-serif;
    background-color: #f5f5f5;
    text-align: center;
}

.container {
    max-width: 600px;
    margin: 2em auto;
    padding: 1em;
    background: white;
    border-radius: 12px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

button {
    padding: 0.75em 1.5em;
    font-size: 1.1em;
    border: none;
    border-radius: 8px;
    background-color: #4CAF50;
    color: white;
    margin-top: 1.5em;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #45a049;
}

blockquote {
    font-size: 1.3em;
    line-height: 1.6em;
    margin: 1.5em 0 0.5em;
    padding: 0 1em;
}

/* Fade in/out helper class */
.hidden {
    opacity: 0;
    transition: opacity 0.4s ease;
}

#author {
    font-size: 1em;
    color: #555;
    font-style: italic;
    margin-top: 0.5em;
}

/* Spinner styling */
.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #555;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

/* Fade animation */
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}